US3089329A

US3089329A - Lock assembly for a refrigerated cabinet or the like

Info

Publication number: US3089329A
Application number: US157685A
Authority: US
Inventors: William J Kerr
Original assignee: Chicago Lock Co
Current assignee: Chicago Lock Co
Priority date: 1961-12-07
Filing date: 1961-12-07
Publication date: 1963-05-14
Anticipated expiration: 1980-05-14

Description

y 1963 w. J. KERR 3,089,329

LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE Filed Dec. 7, 1961 3 Sheets-Sheet 1 iiliiii 3+ INVENTOR.

25 WILL/AM a. KERR ATTX y 14, 1953 w. J. KERR 3,089,329

LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE Filed Dec. 7, 1961 3 Sheets-Sheet 2 INVENTOR.

W/LLIAMJ- KERR M MW May 14, 1963 w. J. KERR 3,

LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE Filed Dec. '7, 1961 3 Sheets-Sheet 3 INVEN TOR.

WILLIAM J. KER

3,089,329 LOCK ASSEMBLY FGR A REFRIGERATED CABHJET OR THE LIKE William J. Kerr, Glenview, 11., assignor to Chicago L ck Company, Chicago, ill., a corporation of Illinois Filed Dec. 7, i961, Ser. No. 157,685 13 (Jiaims. (Cl. 70-135) The present invention relates to door lock assemblies for cabinets and has particular reference to a draw lock assembly of the nested handle type wherein the rotatable draw shaft is given added impetus by means of an operating leverage-applying handle located on the outside of the door to which the lock assembly is applied and, when the door is in its locked condition, may be pushed manual-ly into a well, pocket or recess where it is inaccessible for manipulation.

The improved draw lock comprising the present invention has been designed for use primarily in connection with coin-operated, refrigerated, vending machine cabinet of the type which is commonly utilized in public places and serves as a medium for dispensing such products as milk, bottled soft drinks, measured quantities of soft drinks in paper drinking containers, prepared sandwiches, and the like. The invention may, however, be found usefill in connection with a non-refrigerated vending machine cabinet for dispensing chewing gum, candy bars and edible products of a similar nature, or with a vending machine which is designed to dispense such articles as toothbrushes, combs, handkerchiefs and a wide variety of sundries too numerous to mention. Irrespective, however, of the particular use to which the present draw lock assembly may be put, the essential features of the invention are at all times preserved.

The cabinet door of a vending machine, particularly a refrigerate-d vending machine, is heavily gasketed and, upon closure thereof, it is necessary to compress the gasket tightly so that there will be no heat losses around the door jarnb. The degree of pressure which must be exerted by the marginal region of a given door against its sealing gasket to effect the necessary hermetic seal is appreciable, considering the size of the average refrigerated vending machine door. For this reason, suflicient torque cannot be applied to the cam-equipped draw shaft through the medium of the key-operated lock cylinder of the door-locking mechanism to move the cam to its operative or locked position or, in the case of a screw-in type of locking element, to draw the door against the sealing gasket with any appreciable degree of force. To supply the added degree of torque necessary to turn the draw shaft, it has been customary to provide a leveragea-pplying handle which turns with the draw shaft, the bandle being disposed on the outside of the cabinet door. To prevent unauthorized manipulation of the handle or attempts to manipulate it by forcing the same when the door is locked, a recess is provided in the lock housing and the handle and draw shaft are slidably keyed or otherwise connected together so that, when the door is in its locked condition, the handle may be radially aligned with the recess, moved thereinto and retained therein so that access to the handle for turning purposes is preeluded.

A draw lock assembly of the type heretofore mentioned is possessed of one serious limitation arising from the fact that, in the case of a cam type look, when the cam is in its home position against its cooperating locking shoulder, the handle is not necessarily in alignment with the handle-retaining recess in the door. Since the cam is in its home position, the handle cannot be further turned in the locking direction to effect the required alignent and, if the handle is backed up or turned away from the locking position, the cam will be moved away from its home position and the door may become insecurely locked or altogether unlocked. In the case of a screw-in type of draw shaft, after the gasket has become suflicient-ly compressed to efiect the desired seal, the handle may or may not, depending on chance, be in alignment with the recess. If it is not in alignment, further turning of the handle in a locking direction to bring it into alignment can only be accomplished by the application of an inordinate amount of torque to the handle, sometimes of such magnitude that it is not within the capabilities of the operator to exert it. Backing off of the handle will, of course, reduce the pressure on the gasket and may destroy the seal.

The present invention is designed to overcome the abo venoted limitation that is attendant upon the construction and use of a draw lock assembly employing a nested handle and, accordingly, it contemplates the provision of a lost motion connection between the handle and draw shaft, such connection establishing a positive drive between the handle and draw shaft during door tightening operations, but allowing for a limited degree of reverse movement of the handle after the tightening operation has been completed, such reverse movement being disassociated from the draw shaft so that the locking cam (in the case of a cam type lock), or the draw screw (in the case of a screw-in type lock), will remain in its home position.

The invention has been illustrated herein for exemplary purposes as being applied to a draw lock assembly of the cam type, it having special usefulness in connection with such a lock assembly in that rarely does the cam have an amplitude of movement of more than before it is in its home or locked position, this amount of reverse movement being approximately the amount permitted by the lost motion connection of the present invention. The invention is, however, applicable to screw-in type draw lock assemblies, particularly in an instance where a sealing gasket is of relatively thin construction and requires little compressional force or movement in order fully to compress it.

The provision of a draw lock assembly of the character briefly outlined above being among the principal objects of the invention, another object is to provide such an assembly wherein the lost motion is a relatively strong one, which is to say that it affords an appreciable degree of metal-to-metal contact between the driving and driven parts of the lock assembly under all conditions of installation so that a positive movement of the draw shaft will result and there will be no danger of stripping or distortion of parts.

A further object of the invention is to provide a lock assembly having such a lost motion connection and wherein the assembly is capable of being installed in doors of different thicknesses, or in installations where the reaction member of the locking elements proper is at varying distances from the door panel in which the look assembly is mounted.

With these and other objects in view, which will become more readily apparent as the following description ensues, the invention consists in the novel construction, combination and arrangement of parts shown in the accompanying three sheets of drawings forming a part of this specification.

In these drawings:

FIG. 1 is a fragmentary front elevational view of a draw lock assembly constructed in accordance with the principles of the present invention, such assembly being shown operatively installed in a cabinet door with the locking cam thereof in its home or locked position and the operating handle thereof in an overrun position with respect to the handle-receiving recess;

FIG. 2 is a side elevational view, partly in section, of the lock assembly shown in FIG. 1;

FIG. 3 is a sectional view taken on the line 3-3 of FIG. 2;

FIG. 4 is a front elevational view similar to PEG. 1 but showing the operating handle restored to a position of register with the handle-receiving pocket, as permitted by the lost motion connection of the assembly;

PEG. 5 is a side elevational View, partly in section, of the assembly shown in FIG. 4;

FIG. 6 is a sectional view taken on the line 66 of FIG. 5;

FIG. 7 is a side elevational view similar to FIGS. 2 and 5 but showing the operating handle in a nested position within the handle-receiving pocket; and

FIG. 8 is a sectional view taken on the line 8--8 of FIG. 2.

Referring now to the drawings in detail and in particular to FIGS. 1 to 3, inclusive, the draw lock assembly of the present invention has been designated in its entirety by the reference numeral 1%) and, for exemplary purposes, the assembly has been illustrated as being operatively installed upon a relatively thin sheet metal front or outside door panel, a fragment of which has been shown at 12. The door with which the panel 12 is associated may, for purposes of discussion, be regarded as being the front swinging door of a commercial refrigerated vending machine cabinet. The door, in addition to the front or outside panel 12, is also provided with an inside panel (not shown) and the space existing between the two panels may be filled with a suitable insulating material. In some installations, the door also is provided with an intermediate panel which, in combination with the rear inside panel, establishes a compartment for a coin control mechanism. The specific door construction forms no part of the present invention and, therefore, only the front or outside door panel 12 has been illustrated, it being this panel on which the lock assembly 19 is mounted. The door, when in its closed position, is adapted to be drawn against a flexible rubber or other elastomeric sealing strip or door gasket (not shown) which is mounted on the door jamb (also not shown) so that the gasket is adapted to become compressed between the marginal regions of the door and the jamb, as is customary with such refrigerator door assemblies. In the form of the invention illustrated herein, the pressure necessary to draw the door against the gasket is effected under the control of a draw or locking cam 14 which is mounted on the rear end of a rotatable draw shaft 16 and cooperates with an inclined cam surface 18 on a fixed bracket 1 on the cabinet framework.

The draw lock assembly involves in its general organization a front housing 21) and a rear supporting plate 22, the two parts being connected together and maintained in spaced relationship by spacer bars 24 of hexagonal cross sectional configuration. The front housing 26 is mounted within a rectangular opening 26 in the panel 12 and is held therein by any suitable means, such as screw 28. The mounting means for the front housing 20, in the illustrated environment for the lock assembly, constitutes the sole supporting means for the lock assembly as a whole, and the lock assembly is thus entirely supported on the panel 12.

The front housing 2t) is generally rectangular in vertical cross section and has an apreciable vertical extent and a small transverse width. It is preferably in the form of a die casting and has a rim flange 30 which fits flush against the outside face of the panel 12, when the lock assembly is installed in the door. The front face of the housing 29 is provided with a shallow rectangular recess 32 for reception therein of a torque-applying operating handle 34, the nature and function of which will be made clear presently. The recess 32 is formed by a bottom wall 36 and, in addition, a forwardly extending marginal wall 38 from which the rim flange 30 extends laterally. The marginal wall 38 is shaped conformably to the opening 26 and fits snugly therein.

The rear supporting plate 22 is formed of heavy gauge plate metal. It is of diamond shape or configuration as shown in dotted lines in FIG. 1 and has a central opening 44? therein. A sleeve bearing 42 fits snugly in the opening 4% and forms a medium for rotatably supporting the draw shaft 16. The plate 22 thus constitutes, in effect, a. rear bearing member for the draw shaft 16. The edges of the plate 22 are provided with laterally turned or bent retaining ears 44- which, in combination with one another, define a seat for a handle-projecting spring 46, the operation of which will be made clear presently.

The front housing 29 has a central bore 50 therein and the handle 34 is provided with a cylindrical hub portion 52 which extends through and is rotatably and slidably mounted in the bore 59. The front housing thus constitutes a bearing member for the hub portion 52. The handle 34 includes a pair of oppositely extending lever arms 54- which are arranged in alignment on opposite sides of the hub portion 52. Said handle is slidable horizontally and axially between the retracted position wherein it is shown in FIG. 7 and the extended position wherein it is shown in PEG. 5. In its retracted position, the lever arms 54- are maintained wholly within the confines of the shallow rectangular recess 32. In the extended position of the handle, the lever arms 54 are disposed an appreciable distance forwardly of the vertical plane of the outside panel 12.

The rear end of the hub portion 52 of the handle 34 is provided with a reduced portion 56 which telescopically receives thereover the forward end of a driver sleeve 53. Such sleeve is pinned as at 64) to the reduced portion 56. It, in effect, constitutes a rearward extension of the hub portion 52 inasmuch as it is fixed to and movable bodily with the hub portion. An external radial stop flange 62 is formed on the sleeve 58 and is designed for engagement with the forward annular end face 64 of the sleeve bearing 51. The stop flange 62 thus acts as a limit stop to determine the fully extended or forward position of the handle 34. The forward end of the spring 46 bears against the flange 62 and normally and yieldingly urges the driver sleeve 58 forwardly for handle extending or projecting purposes.

The rear end of the driver sleeve 58 is formed with a thickened region 70 (see FIG. 3) through which there extends an irregularly shaped socket 72. The latter is adapted telescopically, rotatably and slidably to receive therein a flattened end region 74 which is formed on the draw shaft 16. The socket 72 may be defined as having two communicating socket sections or sectors, each presenting

side walls

76 and 78 which are inclined toward each other and lie in respective secant planes. The two walls 76 are parallel to and offset slightly from a diametric plane on opposite sides thereof, as also are the two walls 78. The angle existing between the secant planes of the two walls 76 and 7 8 of each sector is preferably in the neighborhood of The distance between the parallel secant planes of the walls 76 is equal to the thickness of the flattened end region 74- of the driver shaft 16, as is also the distance between the parallel secant planes of the walls '78. The flattened end region 74 which projects into the socket 72 in coaxial alignment therewith is capable of having its flat opposite sides in driven engagement with the Walls 78, respectively, during rotation of the shaft 16 in a clockwise direction as viewed on P16. 1, i.e., during cam-tightening door locking operations when the handle 34 is being turned in a clockwise direction as viewed in FIG. 1. It is also capable of having its flat opposite sides in driven engagement with the walls 76, respectively, during cam-releasing door unlocking operations when the shaft 16 and handle 34 are being turned in the opposite direction. The

various walls

76 and 78 thus, in effect, constitute driving abutments which are selectively engageable with the opposite sides of the flattened end region 74 of the draw shaft 16 upon rotation of the handle 34 in opposite directions. The edge regions of the flat sides of the end region 74 project radially outwardly and extend between the pairs of circumferentially spaced opposed walls and, because the circumferential spacing of the walls of each opposed pair is greater than the distance between these flat sides, the two-way driving connection between the driver sleeve and the draw shaft involves a limited degree of lost motion.

The draw shaft 16 is rotatably mounted within the sleeve bearing 42 and is held against axial shifting in one direction by means of an integral collar 80. It is held against shifting in the opposite direction by means of a split ring 82 in an annular groove 84 in the shaft. The rear projecting end of the shaft 16 is reduced and threaded as at 86 and receives thereover the flat locking cam 14, suitable clamping nuts 88 being received on the threaded portion 86 on opposite sides of the cam. The cam is held against relative turning movement relatively to the shaft by means of flattened sides or relief areas 90 on the threaded portion of the shaft 16, these flattened sides cooperating with similarly flattened edge regions of the shaft-receiving opening in the cam 14.

In the operation of the lock assembly 10, assuming that the cabinet door is closed upon the door jamb but that the door has not yet been tightened against the door gasket, rotation of the handle 34 in a clockwise direction as viewed in FIG. 1 will serve to effect a direct drive from the handle through the hub portion 52 and the driver sleeve 58 to the flattened end region 74 of the draw shaft 16. The driving connection between the driver sleeve '58 and the draw shaft 16 is established by reason of the two planar surfaces of the side walls 78 (see FIG. 3) of the socket 72 which bear against the opposite flat sides of the flattened portion 74 of the shaft 16. Contin'ued rotation of the handle 34 serves to move the looking cam 14 behind the cooperating cam surface 18 on the fixed bracket 19 so that the cam will ride on such surface and thus draw the door against the sealing gasket provided for it on the door jamb.

Cabinets which are designed for use with cam type draw locks are usually provided with stop pins or the like, such as the pin 92 shown in FIG. 1, to prevent overrunning of the cam. Due to the fact that, in connection with vending machine cabinets, it is the policy of the management to change locks frequently, especially when the operator has failed to turn in his key upon termination of his employment, there is no assurance that with different cabinets the handle of each newly installed lock will register with the recess provided for it in the cabinet. If it is assumed, therefore, that in the illustrated environment of the lock assembly 10, at such time as the locking cam 14 engages the stop pin 92, the handle 34 assumes the position wherein it is shown in MG. 1 in which it has overrun its position of registry with the elongated recess 32 by an angular extent approximating 30. Ordinarily, to back up on the handle by rotating it in a counterclockwise direction would be to back up on the draw shaft 16 and the cam 14. However, in the present instance, the handle may be rotated in such reverse direction as to restore the handle to a position of registry with the recess 32 and the home position of the locking cam 14 will not be disturbed. This is due to the lost motion connection between the driver sleeve 58 and the flattened portion 74 of the draw shaft 16. Upon such reverse movement of the handle, the hub portion 52 and the driver sleeve will be rotated so that the planar surfaces of the side walls 78 of the socket 72 will move away from the opposite flat sides of the flattened portion 74 of the draw shaft 16, as show-n in FIGS. 5 and 6, leaving the position of the draw shaft 16 undisturbed. When the handle 34 has thus been restored to a position of registry with the shallow recess 32, it may be pushed forwardly against the action of the spring 46 so that the hub por- 6 tion 52 will slide within the sleeve bearing 51 and the bore 5b, whereupon the handle will enter the recess and become nested therein.

The handle 34 is adapted to be maintained in its nested position within the shallow recess 32 in the closed position of the door by means of a spring-pressed latch pin (see FIGS. 2, 5, 7 .and 8) which is slidable in a radially disposed guideway 102 in the hub portion 52 of the handle 34. The latch pin 100 normally projects outwardly of the guideway 102 so that when the handle 34 is in its retracted or nested position, the pin will project radially outwardly beyond the confines of the sleeve bearing 51 and be forced by the spring 46 into engagement with the end face 64 of said sleeve bearing, this end face serving in the manner of a latch plate to prevent forward movement of the handle 34 out of the shallow recess 32. The hub portion 52 of the handle 34 is formed with an internal bore 104 in which there is removably received a conventional tumbler type lock unit comprising a barrel 106 and a rotatable tumbler-equipped cylinder 109'. The unit is held in position by means of a set screw 108. The sole function of the lock unit is to retract the latch pin i so that the handle may move forwards and leave the shallow recess 32 under the impelling influence of the spring 46, thus rendering the handle accessible for door locking and unlocking purposes. The manner in which the cylinder 109 of the lock unit cooperates with the latch pin 100 to retract the same forms no part of the present invention except insofar as afiects the operation of the lost motion connection between the driver sleeve 58 and the draw shaft 16. Such a cooperating latch pin and lock unit forms the subject matter of copending United States patent application Serial No. 115,968, filed on June 9, 1961 by Martin H. Dettmer and entitled Draw Lock for a Sealed Cabinet Door, and reference may be had to such application for a full understanding of the handle-latching mechanism disclosed therein. Briefly, however, for purposes of disclosure herein, the illustration of FIG. 8 reveals that the latch pin tilt) is formed with a flattened plate portion 1ft having a transverse slot 112 therein. A short eccentric pin 11 is formed on the rear end face of the rotatable cylinder 169 and projects into the slot 112. By rotating the cylinder 109 in one direction, under the influence of the usual key 116 (see FIG. 5), the pin 114 will be caused to ride in the slot 112 and bear against one side thereof to effect retraction of the latch pin 100 against the action of a spring 118. When the cylinder 109' is rotated in the other direction, the eccentric pin 114 will bear against the other side of the slot 112 and, the spring 118 will force the latch pin 109 radially outwardly to its effective latching position.

Referring to FlGS. 4, 5 and 6, it will be seen that, when the handle is unlocked and maintained in its advanced or projected position under the influence of the spring 46, the handle may be turned in a counterclockwise direction as viewed in H6. 4, at which time the walls 76 of the socket 72 will move into engagement with the opposite flat sides of the flattened portion 74 of the draw shaft 16 and establish a driving connection between the driver sleeve 58 and the shaft so that the locking cam 14 may be withdrawn from behind the bracket 19 to thus release the door for opening purposes.

The

walls

76 and 78 have been described herein as being associated with a socket 72 which is formed in the driver sleeve 58 but it should be understood that the term socket as employed herein does not necessarily imply that the void referred to is provided with a bottom wall. It is sufficient that the flattened end 74 of the draw shaft projects into the driver sleeve and that the latter be axially and circumferentially shiftable relatively to the draw shaft. It should also be understood that the driver sleeve 58, because it is fixed to and movable bodily with the hub portion 52 of the handle 34, may be regarded as constituting a functional element of the hub portion. When thus considered as a part of the hub portion, the

'2 socket 72 may be considered to be formed in the hub portion of the handle.

The invention is not to be limited to the exact arrangement of parts shown in the accompanying drawings or described in this specification as various changes in the details of construction may be resorted to without departing from the spirit of the invention. For example, while the angular span of the two identical sectors associated with the socket 72 in the driver sleeve 58, i.e., the angle of inclination between the

walls

76 and 78 thereof, has been illustrated herein as being on the order of 90, this distance is predicated upon the fact that the normal throw of the cam 14 in moving from an unlocked position to its home position is not in excess of 96. Where a smaller cam throw is contemplated, the inclination of these walls may be reduced correspondingly. Therefore, only insofar as the invention has particularly been pointed out in the accompanying claims is the same to be limited.

Having thus described the invention what I claim as new and desire to secure by Letters Patent is:

1. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said members in their spaced relationship, said front member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for camming engagement With a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped conformabiy to the shape of the recess in the front bearing member and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket so that the socket is axially and telescopically shiftable relatively to the draw shaft, and cooperating means on the wall of the socket and the forward end of the draw shaft establishing a two-way driving connection between the hub portion and the draw shaft, said last mentioned means providing for a limited degree of circumferential lost motion between the hub portion and the draw shaft.

' 2. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for camming engagement with a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket so that the socket is axially and telescopically shiftable relatively to the draw shaft, means on the wall of said socket establishing a pair of circumferentially spaced opposed driving abutrnents, means on the forward end of the draw shaft, within the socket, and projecting radially between the abutments and selectively engageable therewith upon rotation of the hub portion in opposite directions respectively and establishing a two-way driving connection between the hub portion and draw shaft, the circumferential extent of said radially projecting means being less than the circumferential spacing of said abutments whereby said two-way driving connection involves a limited degree of lost motion.

3. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front hearing member, means fixedly securing said members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for camming engagement with a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket coaxially therewith so that the socket is axially and telescopically shiftable relatively to the draw shaft, means on the wall of said socket establishing a pair of circumferentialy spaced opposed driving abutments, the forward end of said draw shaft presenting a pair of oppositely facing abutment-engaging shoulders which project radially outwardly between said driving abutments and which are selectively engageable therewith upon rotation of the hub portion in opposite directions respectively, the circumferential spacing of said shoulders being less than the circumferential spacing of said abutments whereby a driving connection is established between the hub portion and draw shaft involving a limited degree of circumferential lost motion 4. in a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front hearing member, means fixedly securing said members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for camming engagement with a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable in said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket axially therewith so that the socket is axially and telescopically shiftable relatively to the draw shaft, the wall of said socket being provided with two pairs of circumferentially spaced opposed driving abutments, the circumferential spacing between the driving abutments of each pair being equal, the forward end of said draw shaft being provided with two pairs of oppositely facing abutment-engaging shoulders, the shoulders of each pair projecting radially outwardly between the driving abutments of a respective pair of driving abutments, the circumferential spacing between the shoulders of the two pairs being equal, corresponding shoulders of the two pairs of shoulders being engageable with corresponding abutmen-ts of the two pairs of abutments upon rotation of the hub portion in opposite directions, the circumferential spacing between the shoulders of each pair of shoulders being less than the circumferential spacing between the abutments of each pair of abutments whereby a driving connection involving a limited degree of circumferential lost motion is established between the hub portion and the draw shaft.

5. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from, said front bearing member, means fixedly securing said members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for oamming engagement with a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped oonformably to the shape of the recess in the front bearing member and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket coaxially therewith so that the socket is axially and telescopically shiftable relatively to the draw shaft, the wall of said socket being formed with a pair of circumferentially spaced opposed planar driving surfaces which lie in respective secant planes, the forward end of the draw shaft being for-med with a pair of oppositely facing planar driven surfaces which are disposed between and circumferentially oppose said driving surfaces respectively, the circumferential spacing of said driving surfaces being greater than the circumferential spacing of said driven surfaces, said driving and driven surfaces being designed for respective face-to-face contact with each other upon rotation of the hub portion in opposite directions respectively, whereby a driving connection is established between the hub portion and draw shaft involving a limited degree of circumferential lost motion.

6. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front hearing member, means fixedly securing said members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for oammin-g engagement with a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket coaxially therewith so that the socket is axially and telescopically shiftable relatively to the draw shaft, the wall of said socket being formed with first and second pairs of circumferentially and equally spaced opposed planar driving surfaces which lie in respective secant planes with respect to the socket, the forward end of the draw shaft being formed with first and second pairs of oppositely facing equally spaced planar driven surfaces which lie in respective secant planes with respect to the draw shaft, one surface of each pair on the wall of the socket being adapted to engage a respective surface of a pair on the forward end of the draw shaft in driving relationship when the hub portion is rotated in one direction, the other surface of each pair on the wall of the socket being adapted to engage a respective surface of a pair on the forward end of the draw shaft when the hub portion is rotated in the opposite direction, the secant planes of the two surfaces on the wall of the socket which are engaged by surfaces on the forward end of the draw shaft when the hub portion is rotated in either direction being spaced apart a distance equal to the spacing of the secant planes of the oppositely facing driven surfaces on the forward end of the draw shaft.

7. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front hearing member, means fixedly securing said members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw shaft projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw shaft, a draw cam on said draw shaft rearwardly of the rear bearing member and designed for camrning engagement with a substantially fixed shoulder on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket coaxially therewith so that the socket is axially and telescopically shiftable relatively to the draw shaft, the wall of said socket being formed with first and second pairs of circumferentially and equally spaced opposed planar driving surfaces which lie .in respective secant planes with respect to the socket, the forward end of the drive shaft being flattened to provide oppositely facing planar driven surfaces which lie in respective parallel secant planes with respect to the drive shaft, one surface of the first pair of driving surfaces being designed for engagement with one driven surface and one surf-ace of the second pair of driving surfaces being designed for engagement with the other driven surface when the hub portion is rotated in one direction, the other surface of the first pair of driving surfaces being designed for engagement with the other driven surface and the other surface of the second pair of driving surfaces being designed for engagement with said one driven surface when the hub portion is rotated in the other direction, the distance between said driven surfaces being less than the circumferential distance between the driving surfaces of each pair whereby a twoway driving connection is established between said hub portion and the draw shaft involving a limited degree of lost motion.

8. In a draw lock for a sealed cabinet door, in combination, a housing structure adapted to be installed in an opening in the door and embodying front and rear internal bearings, said housing structure having a front face provided with a shallow elongated recess therein, an operating handle positioned forwardly of said housing structure and having a hub portion projecting rearwardly through the front internal bearing and rotatable and axially slidable therein, a draw shaft projecting forwardly through the rear bearing and in axial alignment with said hub portion, means for preventing axial shifting of the draw shaft, means on said draw shaft rearwardly of the rear bearing and designed for cooperation with a substantially fixed reaction surface on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front face of the housing structure and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess and an extended position wherein the handle is projected forwardly of said recess, the rear end of said hub portion being formed with a relatively deep socket therein, the forward end of the draw shaft projecting into said socket so that the socket is axially and telescopically shiftable relatively to the draw shaft, and cooperating means on the wall of the socket and the forward end of the draw shaft establishing a two-way driving connection between the hub portion of the handle and the draw shaft when the handle is in its extended position, said last mentioned means providing for a limited degree of circumferential lost motion between the hub portion and the draw shaft.

9. In a draw lock for a scaled cabinet door, the combination set forth in claim 8 and including, additionally,

spring means normally urging said operating handle toward its extended position.

10. In a draw lock for a sealed cabinet door, the combination set forth in claim 8 and including, additionally, spring means normally urging said operating handle toward its extended position, and a key-operated lock assembly disposed within said operating handle and having means associated therewith for holding the handle in its retracted position against the action of said spring means.

11. In a draw lock for a sealed cabinet door, in combination, a housing structure adapted to be installed in an opening in the door and embodying front and rear internal bearings, said housing structure having a front face provided with a shallow elongated recess therein, an operating handle positioned forwardly of said housing structure and having a hub portion projecting rearwardly through the front internal bearing and rotatable and axially slidable therein, a draw shaft projecting forwardly through the rear bearing and in axial alignment with said hub portion, means for preventing axial shifting of the draw shaft, means on the rear end region of said draw shaft designed for engagement with a substantially fixed cooperating reaction surface on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front face of the housing structure and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of said housing structure and out of the recess, and means establishing a two-way driving connection between said hub portion of the operating handle and the draw shaft while permitting axial shifting of the hub portion in either direction, said last mentioned means providing for a limited degree of circumferential lost-motion between the hub portion and the draw shaft.

12. In a draw lock of the character described, a housing presenting an outwardly facing recess, an operating handle having a hub portion slidable and rotatable in said housing, said handle being shaped conformably to the shape of the recess and being movable bodily with the hub portion between a retracted position wherein the handle is in an angular position of register with and is disposed within the recess, and an extended position wherein the handle is projected forwardly of the housing and out of the recess, key-controlled latch means for maintaining the handle and hub portion in their retracted position, a rotatable draw shaft in axial alignment with said hub portion and connected to the housing, means on said draw shaft designed for cooperation with a fixed reaction surface and adapted, upon rotation of the draw shaft in one direction, to move the draw shaft, and consequently, the housing to which it is connected, forwardly, and a lost-motion driving connection between said hub portion of the handle and the draw shaft.

13. In a draw lock of the character described, an elongated housing structure presenting at the front end thereof an outwardly facing recess, an operating handle having a hub portion slidable and rotatable in said housing structure, said handle being shaped conformably to the shape of the recess and being movable bodily with the hub portion between a retracted position wherein the nandle is in an angular position in register with and is disposed within the recess, and an extended position wherein the handle is projected forwardly of the housing and out of the recess, lock-controlled latch means for maintaining the handle and hub portion in their retracted position, a rotatable draw shaft in axial alignment with the hub portion and having its front end extending into the rear end of the housing structure and provided with means whereby the draw shaft is held against axial shifting with respect to the housing structure, means on the rear region of the draw shaft designed for cooperation with a substantially fixed cooperating reaction surface, and means establishing a two-way driving connection between said hub portion of the handle and the front end of the draw shaft while permitting axial shifting of the hub portion in either direction, said last mentioned means providing for a limited degree of circumferential lost motion between the hub portion and the draw shaft.

References Cited in the file of this patent UNITED STATES PATENTS 592,606 Draullette et al Oct. 26, 1897 1,495,820 Tierney May 27, 1924 2,098,012 Papst Nov. 2, 1937 2,570,160 Schoch Oct. 2, 1951

Claims

12. IN A DRAW LOCK OF THE CHARACTER DESCRIBED, A HOUSING PRESENTING AN OUTWARDLY FACING RECESS, AN OPERATING HANDLE HAVING A HUB PORTION SLIDABLE AND ROTATABLE IN SAID HOUSING, SAID HANDLE BEING SHAPED CONFORMABLY TO THE SHAPE OF THE RECESS AND BEING MOVABLY BODILY WITH THE HUB PORTION BETWEEN A RETRACTED POSITION WHEREIN THE HANDLE IS IN AN ANGULAR POSITION OF REGISTER WITH AND IS DISPOSED WITHIN THE RECESS, AND AN EXTENDED POSITION WHEREIN THE HANDLE IS PROJECTED FORWARDLY OF THE HOUSING AND OUT OF THE RECESS, KEY-CONTROLLED LATCH MEANS FOR MAINTAINING THE HANDLE AND HUB PORTION IN THEIR RETRACTED POSITION, A ROTATABLE DRAW SHAFT IN AN AXIAL ALIGNMENT WITH SAID HUB PORTION AND CONNECTED TO THE HOUSING, MEANS ON SAID DRAW SHAFT DESIGNED FOR COOPERATION WITH A FIXED REACTION SURFACE AND ADAPTED, UPON ROTATION OF THE DRAW SHAFT IN ONE DIRECTION, TO MOVE THE DRAW SHAFT, AND CONSEQUENTLY, THE HOUSING TO WHICH IT IS CONNECTED, FORWARDLY, AND A LOST-MOTION DRIVING CONNECTION BETWEEN SAID HUB PORTION OF THE HANDLE AND THE DRAW SHAFT.