US1925821A - Lifting jack - Google Patents

Description

Pt- 1933. F. H. S'GHWERIN 1,925,821

LIFTING JACK Filed Jan. 12, 1931- VENTOR 7 ATTORNEY Patented Sept. 5, 1933 PATENT OFFICE LIFTING JACK I Frank H. Schwerin, Bellevue Borough, Pa., as-

signor to The Duff-Norton Manufacturing Company, Pittsburgh, Pa., a corporation of Pennsylvania Application January 12, 1931. 7 Serial No. 508,127 10 Claims. (Cl. 28053) I This invention relates to heavy lifting jacks,

having wheels onto the rolling support of which the jack canbe tilted for trundling. These jacks have a firm base to rest on the ground, and a standard "risingfrom the base, in which standard the ram or lifting member is guided;

Two wheels are applied to some lower part of thehousing at such elevation that they normally clear the ground.

It requires a substantial amount of eifort to pull one of'these jacks over onto its. wheels,and

is rigidly braced by and'between the fixed parts of a socket. The handle thus mounted can be latched in the erect position, the latch not being subjected to the stresses but being merely a-retainer. I Another-object is to provide a trundling handle of a type easy to grasp, which handle when swung down can be disposed as close as possible to the housing. I The general purpose is to provide a light, compact, very strong and very convenient handle construction, which can be little 'expense. I

Other objects and features of the invention will be apparent to those skilled in the art a the specification proceeds.

In the accompanying drawing, forming part hereof: v

Fig. 1 is an elevation of a jack' embodying the broken lines; i v

Fig. 2 is a fragmentary sectional elevation lookportion of the handle being broken out;

Fig. 3 is a section taken on the line33 of Fig. 1; and

Fig. 4 is a section taken on the line 44 of Fig. 2; two extreme positions of the handle in respect to swiveling about its longitudinal axis being shown in full and broken lines, respect l The housing of the jack has a base 2 and a standard 3/ In the latter'is guided the ram, the head 4 of which is seen in Fig. 1. The lifthandle which is pivoted so that it can be folded down out of the way' and which when erected made easily and at invention, the handle being shown in the folded condition in full lines and in erect position in ing at right angles to Fig.1, an intermediate ing screw and the operating mechanism need not be illustrated since they form no part of the invention. The jack may be operated by an air motor 5 applied to the lower part of the housing, though that is not material.

The two trundli ng wheels 6 are carried by axles '7 on suitable brackets 8 of the lower por-' tion of the housing. It will be understood that these wheels are projected away from the base in what may be termed, for convenience, a rearward direction, so that the jack can be tilted onthe'edge of the base as on a fulcrum until the slightly elevated wheels are brought into contact with the ground and the base is then raised clear of the ground, after which the jack can be pushed along on the wheels. Provisions of this character are disclosed in the Kopf & Schwerin Patent No. 1,329,665, dated February 3, 1920. y

The improved trun'dling' handle will now be described.

Bolted to the upper part of the standard, at

the region which may be termed the back, is a fixture 9, which may incidentally cover an opening into the interior. This fixture is formed to provide an integral socket 10 comprising an inner cheek 11, an outer cheek 12 and a side wall 13 uniting them, the whole preferably strengthened-by a rib 14':

A pin'15 is held in openings in'the lower portions of the cheeks, extending across theintervening recess. On this pin' is pivoted one end of a handle stublfi. Because of the relationships, the axial projection of the pin 15 is substantially at right angles to the vertical plane of the wheel axles 7, and the trundlingfhandle will accordingly swing in a lateral arc. By this is meant that thehandle folds down atone side of the jack considered as a wheeling body. In Fig.1 it is shown inclining downward in front of the left-hand wheel 6. v 1

The remaining, and major, part of the trundling handle consists of a tubular shaft 1'7 hav shown in Fig. 4, where it will be seen that the solid portions 21' at the zone of the slot will limit thepin 19, and therefore the shaft 17, to

i The meaning of this term will be evident from the section is such that when the handle is locked by the engagement of the bolt, the handle bars 18 are disposed transversely with relation to the direction of travel represented by the planes of the wheels 6.

When the handle is erected the latch not only locks the shaft 17 with its handle bars 18 against swiveling about the. axis of the shaft,

that is to say about the stub 16, but, alsolocks.

the handle as a whole in the upright position.

Whenthe latch is. released the trundling handle canbe swung down alongside the housing, free of. the superstructure of the motor 5, if the jack is motor driven, and: also clearing the wheel at that side. i

If it were. not for the swivel inthe handle,

the end of one ofthe handle bars 18 would come into contactwith-some part of the hous ing, causing the handle to stand far. out from the jack.. That wou1d=make=the cross-bar type:

of handle, which ismost advantageous, for. the

purpose of these jacks, impractical, and it isfor that reason that I have provided aswivel in the; handle, so that the handle bars. can be turned to lie close to the jack in the folded or dropped, condition. I. have. also provided alock to keepthe handle bars from swiveling when: the handle israised preparatory to moving the jack about, this being in addition to the locking of the handle as awhole against swinging on the pivot 15. I

Whenthe handle is put up.v and locked, the operator grasps the bars 18.- with both hands and pulls towardhim; This uptilts thejackon its base and brings the wheels to the ground,

and it will be Observed that, as between. the

handle and the jack, the stress of this effort is taken by the rigid 'soc ket-10, the cheeks of which are, so to speak, at. right angles tothe plane of action. Thelatch. 22-. is not called on to resist thisstrain or for any other duty than.

to latch. or lock the handle, against. displacement. In like mannerall stresses duringtrund1ing,,and when. the jack is let. down again on its base, are taken directly between. the;handle and; thesocket. I V

While the preferred embodimentofthe invention has been described in detail. it will be understood that the form of the invention may be modified-in various-particulars. V

I claim: A f

1., Inalifting jackhaving a base and housing comprising astandard, and a pair of wheels ontothe rolling-support of which. the jack can be tilted; asocket fixedon the standard, said socket comprising.- outer and. inner. portions rig-idly united in spaced relation, a pivot pin crossing the recess between said portions in: substantially right angular relation to the vertical 'planethrough, the. wheel axles, and' a trundling handle pivoted on said. pin so that it can be swung up and downina lateral. arc, and when erected is rigidly braced between the outer and inner portions of said socket. 1 i

2. In a lifting jack-.hav-inga base and housing comprising a standard, and a pair of wheels onto the rolling support of which the jack can be tilted; a socket fixed on the standard, said socket comprising outer and inner portions rigidly united in spaced relation, a pivot pin crossing the recess between said portions in substantially right-angular relation to the vertical plane through the wheelaxles, and'a trundling handle pivoted on said pin so that it can berswungup and down in a lateral arc, and when erected is rigidly braced between the outer and inner portions of said socket, together with a latch in said socket adapted to hold the handle erect without being subjected to the strain of handling the jack.

3. In aliftingjackhaving a housing comprising a base and a standard, and a pair of Wheels onto: the'rolling: support of which the jack can be tilted; altrundling handle comprising a stub pivoted on the standard and a handle shaft swiveled. on: saidstub, and a latch; adapted to lock-the handle in erect positionandat thesame' time-to lock the handle shaft against swiveling; about its axis.

la/In a lifting jack having; a housing com-- prising a. base and standard, and. a pairof wheels onto. the rolling support of which the jack can be'tilted; a tr undling handle comprise ing a stub pivoted on the standard-and. a. handle. shaft swiveled. on said stub, and provided with cross-bar grips, and. means for. lockingv the handle erect and .the handle shaft against. swiveling.

. 5. In a lifting jack having a. housing-compris ing abase and. a standard, anda. pair of wheels. ontothe rolling support of which the jack cani be. tilted; a. trundlin'g. handle comprising a part pivoted on the standardto. swing intov a folded. position; through a, lateralfarc. substantially at: right angles to-the planes of rotation. of, the. wheels, and across-bar grippart swiveledonthepivoted part. 7 7

6. In a lifting jack having a housingcomprising a base and-.a. standard, and. apair ofwheels onto the rolling support of which the jack can. can be tilted; atrundling handle oomprisinga part pivoted on. the standard to swing, into. a. folded. positionv through a lateral%. arc substantially at rightangles to the planes of rotation. of the wheels, a.cross-bar. grip part swiveledon the pivoted part,v and means for locking both parts. I

7. In a lifting jack having a housing comprising a base and astandard and a pair of wheels onto the rollingsupport of which the jack can. be; tilted; a trundling handle comprising a stub pivoted. to the standard for movement into a folded position, and provided with aquarter turn slot at right anglesto the longitudinal. axis of the stub, a tubular. handle shaft taking over the stub, anda cross-pin extending through said. slot and connecting the handle to the stub-so that thehandle may be oscillated through. a quarter turn with respect, to thestubp 8. In a lifting jack having, a housing-comprising a base and a standard, and a. pair of wheels crossing the recessb'etween said cheeks, ahandle stub pivoted on said pin, a tubular cross-i barred shaft taking over said stub between. said cheeks, a swivel connection betweensaid shaft and stub, and a latchon: said socket to. enter. a hole in'said shaft.

9. In a lifting jack having ahousing compris ing a base and a standard, and a pair of wheels onto the rolling support of which the jack can be tilted; a rigid socket fixed to the standard and having inner and outer cheeks, a pivot pin crossing the recess between said cheeks, a handle stub pivoted on said pin and formed with a quarter-turn slot, a tubular handle shaft taking over said pin and formed with a quarter-turn slot, a tubular handle shaft taking over said stub between said cheeks, a cross-pin in said shaft cooperating with said quarter-turn slot, and a latch on said socket to enter a hole in said shaft.

10. In a lifting jack having a base and housing comprising a standard, and a pair of wheels onto the rolling support of which the jack can be tilted; a bearing on the upper part of the standard with the axis of the bearing in a plane parallel to the plane of rotation of the wheels, and a trundling handle journaled on the bearing, so that the handle can be swung from an erect position to a folded position through a lateral are at right angles to the plane of rotation of the Wheels, whereby the force applied to the handle to tilt the jack will be transmitted through the bearing to the standard and will not tend to move the handle into folded position.

FRANK H. SCHWERIN.

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