US3710735A - Table and elevation lock therefor - Google Patents
Table and elevation lock therefor Download PDFInfo
- Publication number
- US3710735A US3710735A US00103469A US3710735DA US3710735A US 3710735 A US3710735 A US 3710735A US 00103469 A US00103469 A US 00103469A US 3710735D A US3710735D A US 3710735DA US 3710735 A US3710735 A US 3710735A
- Authority
- US
- United States
- Prior art keywords
- arms
- rollers
- bar
- latch member
- pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B9/00—Tables with tops of variable height
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B2200/00—General construction of tables or desks
- A47B2200/0035—Tables or desks with features relating to adjustability or folding
- A47B2200/004—Top adjustment
- A47B2200/0041—Height adjustable table top with parallel link arms
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B9/00—Tables with tops of variable height
- A47B9/02—Tables with tops of variable height with balancing device, e.g. by springs, by weight
Definitions
- the present invention is directed at overcoming the shortcomings of prior elevation lock mechanisms.
- One aspect of the invention lies in utilizing a pair of parallel and cylindrical rollers, in conjunction with a locking bar having flat opposing surfaces, to lock a table surface at any selected elevation.
- the rollers are disposed along opposite sides of the bar and are spaced apart a distance slightly greater than the thickness of the bar.
- a roller support consists primarily of a pair of arms having openings which rotatably receive end portions of the rollers. Such arms are pivotally mounted for movement between an unlocking position wherein at least one of the rollers is disengaged from the bar and a locking position wherein both of the rollers make straight line contacts with the bars opposite side surfaces.
- rollers when the rollers are urged into locking engagement with the bar, their end portions make frictional contact with arcuate surface portions of the arms that is, portions of the arms which define portions of the openings in which the ends of the rollers are journaled. Since the rollers are free to rotate at all times except when the bar is firmly locked in place (rotational movement being possible even then if an excessive force is applied to the support surface), renewed or different contact surfaces are provided whenever a height adjustment is made. Because the contacts are along lines or surfaces rather than at points, the possibilities of cutting, notching, or scoring of the parts through the application of locking forces are virtually eliminated.
- FIG. 1 is a side elevational view of a drafting table equipped with the improved elevation lock mechanism, broken lines indicating the relationship of parts when the support surface is in a lowered position;
- FIG. 2 is a fragmentary side elevational view of the table with a side panel removed therefrom;
- FIG. 3 is a fragmentary and exploded perspective view illustrating details of the elevation lock mechanism
- FIG. 4 is an enlarged and somewhat schematic sectional view illustrating the relationship of parts when locking action occurs.
- FIG. 1 illustrates a drafting table 10 having a table or support surface assembly designated generally by the numeral 11 and a base or supporting assembly designated generally by 12.
- the support surface assembly 11 is shown in a raised position in solid lines and is presented in a lowered position of adjustment by broken lines.
- the support surface assembly consists essentially of a table or board 13 mounted upon uprights 14 which are in turn carried by upper and lower parallelogram links 15 and 16. It is to be understood that the uprights and the links to which they are pivotally connected are provided at opposite sides of the unit.
- links 15 and 16 are pivotally connected to a frame member 17 of base assembly 12 (FIG. 2).
- a transverse connecting tube 18 joins links 15 so that the links on opposite sides move in unison.
- One or more tension springs 20 are disposed within the cavity of the base assembly and, being connected at their lower end to extensions of links 16, exert an upward force upon the parallelogram links to counterbalance the weight of the top assembly 11.
- the elevation lock mechanism is designated generally by the numeral 21 and while only one such mechanism appears in the drawings because of the particular views selected, it is to be understood that a pair of such mechanisms are normally provided, one on each side of the base assembly, and are coupled for simultaneous release upon the depression of a single pedal 22 as hereinafter described. Since such mechanisms are identical in structure and operation, only one will be described in detail herein.
- Elevation lock mechanism 21 includes a generally vertical locking bar 23 which, as shown most clearly in FIG. 3, is generally rectangular in cross sectional configuration.
- the bars upper end is welded or otherwise rigidly secured to a forwardly and upwardly extending member 24 which in turn has its upper end pivotally connected to upright 14. Consequently, when the top assembly 11 travels between its raised and lowered positions, the generally vertical locking bar 23 also travels upwardly and downwardly. It will be observed that when the top assembly 11 is in its partly lowered position as shown in FIG.
- bar 23 is not precisely vertical; however, as the top assembly is shifted upwardly, the bar moves into a more nearly vertical position and, because of the pivoting action of the parallelogram linkage, even assumes a slightly reverse slope (i.e., upwardly and rearwardly) when the top assembly is fully raised. It is intended, however, that the locking bar be maintained in as close as possible to vertical position throughout the entire range of movement of the top assembly.
- the flat, parallel, opposing side surfaces 23a and 23b of the locking bar are normally engaged by a pair of rollers 25 and 26, such rollers being generally cylindrical in configuration and having their axes parallel to said surfaces and normal to the axis of the locking bar.
- the rollers are spaced apart at distance greater than the distance between the bars opposite side surfaces; thus, when a plane passing through the axes of both rollers is disposed normal to the axis of the bar, the bar will be free to shift longitudinally between such rollers.
- the ends of the rollers 25a and 260 are journaled in openings 27 provided in the arms 28 and 29 of a roller support assembly 30.
- Pivot pins 31 project outwardly from points midway between the paired openings 27 thereof and are received within the apertures 32 in the sides 33 of upstanding channel member 34, the sides of such channel also serving to retain rollers 25 and 26 in their journals. Therefore, the arms 28 are supported for pivotal movement about a transverse axis parallel with and equidistant between the axes of rollers 25 and 26.
- Channel member 3.4 is rigidly secured to the base assembly by any suitable means.
- one of its sides is welded or otherwise affixed to a frame member 35 and its lower end is secured to frame member 36. It is to be understood, however, that any suitable means for maintaining channel member 34, and hence the pivot axis of arm assembly 30, immovable with respect to the base assembly may be used.
- Arms 28 and 29 are provided with end portions 28a and 29a which project away from locking bar 23 and which are provided with notches or recesses 37 along their lower surfaces. Such notches of the parallel arms normally receive the laterally projecting pins 38 of a latch member 39 which, in the embodiment shown, is vertically elongated and is of U-shaped cross sectional configuration.
- the latch member is attached by means of upstanding hook 40 to the lower end of atension spring 41, the spring having its upper end connected to a suitable bracket 42 within the cavity of the base (FIG. 2).
- the parts are positioned and arranged so that spring 41 normally exerts an upward force upon the projecting ends of arms 28 and 29, thereby pivoting the arms about the axis of pivots 31 and urging the two rollers 25 and 26 into firm contact with opposite side surfaces 23a and 23b of locking bar 23.
- pedal 22 which is pivotally carried by support rod 43, the rod being rotatably connected to the base 12 by means of brackets 44.
- An angular extension 45 of rod 43 has its end connected to upstanding rod 46 which in turn has its upper end affixed to latch member 39.
- rod 46 and hook 40 may be formed integrally and may be welded or connected by any other suitable means to latch member 39.
- the locking surfaces are continually renewable because the locking elements or rollers are free to rotate at any time other than when they are in fully locked positions and, in fact, may even rotate when they are in fully locked positions if an excessive downward force were applied to the top assembly 11.
- rollers 25 and 26 make contact with surfaces 23a and 23b along lines or narrow zones 47 extending horizontally and transversely with respect to the axis of locking bar 23 and longitudinally with respect to the axes of the rollers.
- the rollers are urged outwardly into forceful engagement with arcuate portions 48 of the surfaces of each arm 28 which define portions of the openings 27 in which the ends of the rollers are journaled.
- each of the arms extends in a generally vertical plane, such arcuate surfaces extend in circumferential directions with respect to the ends of the rollers.
- forceful engagement extends along a line or narrow zone rather than at a point, there is no danger that the parts will become notched or scored by reason of the locking force applied by the spring means.
- An elevation lock mechanism comprising a locking bar having a pair of opposite sides providing smooth and parallel surfaces; a pair of parallel and cylindrical rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance greater than the distance between said opposite sides; a roller support including a pair of arms having openings rotatably receiving end portions of said rollers; said arms having arcuate surfaces defining circumferential portions of said openings; and means pivotally mounting said arms for movement between an unlocking position wherein at least one of said rollers is disengaged from said bar and a locking position wherein both of said rollers make straight line contact with said opposite side surfaces of said bar and also make frictional contact in directions extending circurn ferentially of said end portions with said arcuate surfaces of said arms.
- An elevation lock mechanism comprising a locking bar having a pair of opposite sides providing smooth and parallel surfaces; a pair of parallel and cylindrical rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance greater than the distance between said opposite sides; a roller support including a pair of arms having openings rotatably receiving end portions of said rollers; said arms having arcuate surfaces defining circumferential portions of said openings; means pivotally mounting said arms for movement between an unlocking position wherein at least one of said rollers is disengaged from said bar and a locking position wherein both of said rollers make straight line contact with said opposite side surfaces of said bar and also make frictional contact in directions extending circumferentially of said end portions with said arcuate surfaces of said arms; spring means for urging said arms into said locking position; releasing means for relieving.
- An elevation lock mechanism comprising a locking bar having opposite sides providing a pair of flat, smooth, and parallel surfaces; a pair of parallel rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance slightly greater than the distance between such surfaces; said rollers having their ends rotatably carried by a pair of armspivotal abouta transverse axis which is parallel with said rollers and which is equidistant therebetween; means mounting said bar and arms for relative movement of said bar between said rollers; spring means for pivoting said arms about said transverse axis to urge the cylindrical surfaces of said rollers into engagement with said opposite surfaces of said bar and thereby locking said bar and rollers against relative movement; and releasing means for releasing the force of said spring means upon said arms.
- rollers have their ends journaled in openings provided in said arms; said ends of said rollers having perimetric portions thereof normally urged by said spring means into frictional contact with said arms along arcuate portions of said openings.
- An elevation lock mechanism comprising a locking bar having opposite sides providing a pair of flat, smooth, and parallel surfaces; a pair of parallel rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance slightly greater than the distance between such surfaces; said rollers having their ends rotatably carried by a pair of arms pivotal about a transverse axis which is parallel with said rollers and which is equidistant therebetween; means mounting said bar and arms for relative movement of said bar between said rollers; spring means for pivoting said arms about said transverse axis to urge the cylindrical surfaces of said rollers into engagement with said opposite surfaces of said bar and thereby locking said bar and rollers against relative movement; releasing means for releasing the force of said spring means upon said arms; said rollers having their ends journaled in openings provided in said arms; said ends of said rollers having perimetric portions thereof normally urged by said spring means into frictional contact with said arms along arcuate portions of said openings; said mounting means mounting said bar and arms for relative transverse transverse
- said releasing means also being connected to said latch member for selectively shifting the same out of engagement with said arms.
- said releasing means includes a foot pedal connected to said latch member.
- a table top assembly comprising a locking bar having a pair of opposite sides providing smooth and parallel surfaces; a pair of parallel'and cylindrical rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance greater than the distance between said opposite sides; a roller support including a pairof arms having openings rotatably receiving end portions of said rollers; said arms having arcuate surfaces defining circumferential portions of said openings; and means pivotally mounting said arms for movement between an unlocking position wherein at least one of said rollers is disengaged from said bar and a locking position wherein both of said rollers make straight line contact with opposite side surfaces of said bar and also make frictional contact in directions extending circumferentially of said end portions with said arcuate surfaces of said arms; one of said assemblies being connected to said bar and the other of said assemblies being connected to said roller support, whereby, said top assembly may be
- a table top assembly a table base assembly; connecting means movably supporting said top assembly for movement into different elevations upon said base assembly; and an elevation lock mechanism comprising a locking bar having a pair of opposite sides providing smooth and parallel surfaces; a pair of parallel and cylindrical rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance greater than the distance between said opposite sides; a roller support including a pair of arms having openings rotatably receiving end portions of said rollers; said arms having arcuate surfaces defining circumferential portions of said openings; means pivotally mounting said arms for movement between an unlocking position wherein at least one of said rollers is disengaged from said bar and a locking position wherein both of said rollers make straight line contact with opposite side surfaces of said bar and also make frictional contact in directions extending circumferentially of said end portions with said arcuate surfaces of said arms; one of said assemblies being connected to said bar and the other of said assemblies being connected to said roller support, whereby, said top assembly may be re
- a table top assembly a table base assembly; connecting means movably supporting said top assembly for movement into different elevations upon said base assembly; and an elevation lock mechanism comprising a locking bar having a pair of opposite sides providing smooth and parallel surfaces; a pair of parallel and cylindrical rollers along said opposite sides having their axes parallel to said surfaces and being spaced apart a distance greater than the distance between said opposite sides; a roller support including a pair of arms having openings rotatably receiving end portions of said rollers; said arms having arcuate surfaces defining circumferential portions of said openings; and means pivotally mounting said arms for movement between an unlocking position wherein at least one of said rollers is disengaged from said bar whereby, said top assembly may be releasably locked in any of a number of selected elevations relative to said base assembly: said table top assembly being operatively connected to said locking bar and said base assembly being operatively connected to said roller support.
Abstract
Description
Claims (28)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10346971A | 1971-01-04 | 1971-01-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3710735A true US3710735A (en) | 1973-01-16 |
Family
ID=22295360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00103469A Expired - Lifetime US3710735A (en) | 1971-01-04 | 1971-01-04 | Table and elevation lock therefor |
Country Status (2)
Country | Link |
---|---|
US (1) | US3710735A (en) |
CA (1) | CA965136A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5398622A (en) * | 1991-10-10 | 1995-03-21 | Steelcase Inc. | Adjustable dual worksurface support |
US5469793A (en) * | 1990-11-29 | 1995-11-28 | Vinten Group Plc | Tiltable load supporting platforms |
US5522323A (en) * | 1993-08-24 | 1996-06-04 | Richard; Paul E. | Ergonimic computer workstation and method of using |
US5704299A (en) * | 1996-04-05 | 1998-01-06 | Haworth, Inc. | Keyboard support |
US5797331A (en) * | 1997-03-28 | 1998-08-25 | Weber Knapp Company | Counterbalanced table mechanism |
WO1999035936A1 (en) * | 1998-01-13 | 1999-07-22 | Techinnovation Gmbh | Height-adjustable table or the like |
US6038986A (en) * | 1998-12-17 | 2000-03-21 | Weber Knapp Company | Brake operational control |
US6575212B2 (en) | 2000-04-28 | 2003-06-10 | Gilman Engineering & Manufacturing Co. Llc | Adjustable height workstation |
US6691626B2 (en) * | 2002-02-19 | 2004-02-17 | Steve Warner | Adjustable table |
US20040118326A1 (en) * | 2002-12-02 | 2004-06-24 | Guy Carpentier | Pop-up mechanism to raise the top of pieces of furniture |
US20090090832A1 (en) * | 1997-03-12 | 2009-04-09 | Humanscale Corporation | Keyboard Support Mechanism |
US8210109B1 (en) | 2007-11-01 | 2012-07-03 | Thomas Gerret Dewees | Pneumatic adjustable-height table |
US20160157614A1 (en) * | 2014-12-08 | 2016-06-09 | Ferdinand Lusch Gmbh & Co. Kg | Seating Furniture with Pivotable Functional Part |
US20200000216A1 (en) * | 2012-07-20 | 2020-01-02 | The Texas A&M University System | Adjustable height desk having a deployable floor mat |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5460104A (en) * | 1994-02-14 | 1995-10-24 | Young, Sr.; James | Stowable table |
CN114735484B (en) * | 2022-06-14 | 2022-09-13 | 冰轮环境技术股份有限公司 | Automatic feeding device and method for sheet metal parts |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2318458A (en) * | 1941-08-29 | 1943-05-04 | John W Boren | Hospital table |
US2404949A (en) * | 1942-09-17 | 1946-07-30 | William H Murphy | Adjustable drafting stand |
US3188986A (en) * | 1962-04-09 | 1965-06-15 | Brunswick Corp | Bedside table |
US3194187A (en) * | 1964-01-13 | 1965-07-13 | Borg Warner | Overbed table |
US3213809A (en) * | 1964-01-13 | 1965-10-26 | Mayline Co | Adjustable table and brake mechanism therefor |
US3273517A (en) * | 1964-02-12 | 1966-09-20 | Hamilton Mfg Co | Drafting table |
US3370556A (en) * | 1966-10-25 | 1968-02-27 | Keuffel & Esser Co | Mechanical counterbalance system |
US3543282A (en) * | 1967-04-11 | 1970-11-24 | Lucien Emile | Drawing board |
-
1971
- 1971-01-04 US US00103469A patent/US3710735A/en not_active Expired - Lifetime
- 1971-06-22 CA CA116,308A patent/CA965136A/en not_active Expired
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2318458A (en) * | 1941-08-29 | 1943-05-04 | John W Boren | Hospital table |
US2404949A (en) * | 1942-09-17 | 1946-07-30 | William H Murphy | Adjustable drafting stand |
US3188986A (en) * | 1962-04-09 | 1965-06-15 | Brunswick Corp | Bedside table |
US3194187A (en) * | 1964-01-13 | 1965-07-13 | Borg Warner | Overbed table |
US3213809A (en) * | 1964-01-13 | 1965-10-26 | Mayline Co | Adjustable table and brake mechanism therefor |
US3273517A (en) * | 1964-02-12 | 1966-09-20 | Hamilton Mfg Co | Drafting table |
US3370556A (en) * | 1966-10-25 | 1968-02-27 | Keuffel & Esser Co | Mechanical counterbalance system |
US3543282A (en) * | 1967-04-11 | 1970-11-24 | Lucien Emile | Drawing board |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5469793A (en) * | 1990-11-29 | 1995-11-28 | Vinten Group Plc | Tiltable load supporting platforms |
US5398622A (en) * | 1991-10-10 | 1995-03-21 | Steelcase Inc. | Adjustable dual worksurface support |
US5522323A (en) * | 1993-08-24 | 1996-06-04 | Richard; Paul E. | Ergonimic computer workstation and method of using |
US5704299A (en) * | 1996-04-05 | 1998-01-06 | Haworth, Inc. | Keyboard support |
US7841570B2 (en) | 1997-03-12 | 2010-11-30 | Humanscale Corporation | Keyboard support mechanism |
US20090090832A1 (en) * | 1997-03-12 | 2009-04-09 | Humanscale Corporation | Keyboard Support Mechanism |
US7841569B2 (en) | 1997-03-12 | 2010-11-30 | Humanscale Corporation | Keyboard support mechanism |
US5797331A (en) * | 1997-03-28 | 1998-08-25 | Weber Knapp Company | Counterbalanced table mechanism |
WO1999035936A1 (en) * | 1998-01-13 | 1999-07-22 | Techinnovation Gmbh | Height-adjustable table or the like |
US6283047B1 (en) | 1998-01-13 | 2001-09-04 | Techinnovation Gmbh | Height-adjustable table or the like |
US6038986A (en) * | 1998-12-17 | 2000-03-21 | Weber Knapp Company | Brake operational control |
US6575212B2 (en) | 2000-04-28 | 2003-06-10 | Gilman Engineering & Manufacturing Co. Llc | Adjustable height workstation |
US6691626B2 (en) * | 2002-02-19 | 2004-02-17 | Steve Warner | Adjustable table |
US20040118326A1 (en) * | 2002-12-02 | 2004-06-24 | Guy Carpentier | Pop-up mechanism to raise the top of pieces of furniture |
US6991199B2 (en) * | 2002-12-02 | 2006-01-31 | Guy Carpentier | Pop-up mechanism to raise the top of pieces of furniture |
US8210109B1 (en) | 2007-11-01 | 2012-07-03 | Thomas Gerret Dewees | Pneumatic adjustable-height table |
US20200000216A1 (en) * | 2012-07-20 | 2020-01-02 | The Texas A&M University System | Adjustable height desk having a deployable floor mat |
US11006744B2 (en) * | 2012-07-20 | 2021-05-18 | The Texas A&M University System | Adjustable height desk having a deployable floor mat |
US20160157614A1 (en) * | 2014-12-08 | 2016-06-09 | Ferdinand Lusch Gmbh & Co. Kg | Seating Furniture with Pivotable Functional Part |
US9867467B2 (en) * | 2014-12-08 | 2018-01-16 | Ferdinand Lusch Gmbh & Co. Kg | Seating furniture with pivotable functional part |
Also Published As
Publication number | Publication date |
---|---|
CA965136A (en) | 1975-03-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HAMILTON INDUSTRIES, INC., WISCONSIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION;REEL/FRAME:004013/0243 Effective date: 19820628 Owner name: HAMILTON INDUSTRIES, INC., 1316 18TH ST., TWO RIVE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION;REEL/FRAME:004013/0243 Effective date: 19820628 |
|
AS | Assignment |
Owner name: HAMILTON INDUSTRIES, INC., ILLINOIS Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN NATIONAL BANK AND TRUST COMPANY OF CHICAGO, A NATIONAL BANKING ASSOCIATION;REEL/FRAME:004238/0072 Effective date: 19820628 Owner name: HAMILTON INDUSTRIES, INC. 555 SKOKIE BLVD., SUITE Free format text: SECURITY INTEREST;ASSIGNOR:AMERICAN NATIONAL BANK AND TRUST COMPANY OF CHICAGO, A NATIONAL BANKING ASSOCIATION;REEL/FRAME:004238/0072 Effective date: 19820628 |