US1761150A - Jack - Google Patents

Description

June 3, v 1930.

A. PETELER JACK 2 Sheets-Shet 1 Filed Oct. 10 1925 INVENTOR ADOLPH PETE LEI? BY Wm M ATTORN EYS June 3, 1930. v -A. PET-ELER ,1

JACK

Filed 001;. 10 1925 2 Sheets-Sheet .2

ATr RNEYS "STAT S I y a a I L761il50 ADOLPI-I PETELER, or rannroivr, new YORK, Assrerronrr'o euro srEorALTIEsuvmnu: FAorUnINe 00., on SAN FnANorso oALIr-onmta, A ooieroanrron' oncALIFoRNm JACK j 3 Application. fi led October 10,1525. Serial No. 61,654.

This invention relatesto lifting jacks and more particularly to jacks of the type employing a litter bar operated by a hand lever,

as shown in my Patent Number 1,393,242,"

5 granted October 11 1921."

The, device herein set forth comprises a toothed'lifter bar which by reason of lifting and'holding pawls associated with other elements may be raised or lowered under the ac- 0 tion of a hand lever.

The present invention provides a, lifting" jack comprising the usual'liifting and holding pawls associated with a toothed lifter bar. The lifting pawlsare actuated by-the manual bar or for permitting a continuous drop of the lifterbar. The elements for causing the last-mentioned operations maybe provided as separate units manufactured so as to be applied to the other elements of the jack in a This unit which serves'as a mechanism to change the cheap and labor-saving manner.

direction of movementof the lifter bar, may betermed a reversing mechanism.

The reversing mechanism'm'ay comprise a bearing plate having journaled thereto a lever member in operative relation to'the holding pawl of the ack; a cam member engageable with the said lever member and with the lifting pawl or detent of the jack; also a reversingr lever for cooperation with thecam mem her. Thereversing lever serves as a control for throwing the reversing mechanism into operation.

mechanism applicable to a jackit isonly necessary that the pawls of the jack be provided i with studs projecting through slots in the main casing or housing of thejack. The ack may be completelyassembled ln-so'far as the lifting and holding mechanism is concerned and the reversing unit may also be assembled with the several 'movable'elements thereof manipulation of a hand lever; The holding.

For the purpose of makingmy reversing pivotally mounted on the journal plate of the unit." The journal pl'ateis then 'secured i to the main housing ofthejack with there versing mechanism in the proper relation to r the lifting and holding pawls of the jack. 1"

Considerable advantage is derived from this construction since aljack constructedac cording to my lnvention may be quickly and convenientlyassembled. By having the jour-H 'nal plate carry all the reversingmechanis'm,- the elements thereof maybe arranged and mounted in a simplejig; the holes for the pivot 131113 being drilled or punched in "single operation and movable niember's may be easily ad usted to position on pins extending through the holes and thepinsrive ted over, thus making the reversing unit 7 application to the jack proper.

It'will th s be evident that struct'ed by 'theusual method may "bedm; proved by the additionof reversing mechamsm with but a small increase in cost above I that'entailedtoproducethe usual non-revers' ingjack.

An object of thepresentinventionj'is. therefore, to provide a reversible jack o f 'sim- 'ple construction and at a low cost.

I Another object of the invention is to pro vide a reversing mechanismapplicable tofa llftlflg, jack Vwithout material alteration thereoi i. "1

Another object of the. invention is to procomplete for 550k a I vide a reversing unit ofa cheap and simple construction which may be' applied to-a li.ft.' mg ack at a minimum cost 1 I, Another obj ectfof the invention is to facilitate the manufacture of areversible lifting jack by mounting the reversing mechanismj independently of the lifting mechanism.

' Another object of v the invention is "to pro-i vide a jack-reversing mechanisnnlthe-mow able elements of which may be readily ad justed and retained in their adjusted positions. r v o .1;

Other objects of the invention will become apparent as'the following description is 'readQ,

The inventionjwillbe more clearly "understood by reference to -:the accompanying.-

and the various movable elements in different positions to change the positions of the holding pawl and detent, and

Fig. 6 is a view taken on line Vii-VI in Fig. 4; v

'The selected embodiment illustrated herewith may' comprise a standard 10 having a casing 11 at the upper portion thereof to enclose a lifter pawl 12, a. holding pawl 13, and a toothedlift er bar 14.

The lifter bar may be slidable vertically within the casing 11 and provided with a head or saddle 15. A stop member to prevent removal of the lifter bar may comprise a lip 15" formed from a wall of the housing 10. The lip 15 may be bent inwardly to extend into a groove 17 of the lifter bar and may be engageable with a pin 18 when the lifter bar has reached the limit of its upward movement; Suitably disposed teeth 16 may be provided on the lifter bar, the teeth being movable in operative relation to the pawls 12 and 13.

The lifter pawl 12 may be pivoted on a pin 17 at one end of a short arm 18 of a lever 19, which lever may be pivot-ed on a fixed pin 21 and-may have a long arm 22 eX- tending from the casing 11. The arm 22 may beoonstructed in the usual manner to receive an extension piece (not shown). The holding pawl 13 may be pivoted on apln 23 secured to walls of the casing 11. pawl s 12 and 13 ar normally held in engaging posiv tion'with the teeth 16 of the lifting barunder the action of a spring This spring serves as acommon means for moving the pawls and as shown may be in the form of a continuous piece of spring wire. The wire'mayencircle the pivot posts of the pawls and ends 25 and 26 may engage projecting studs 27 and 28 secured to. and projecting laterally from the pawls 12 and .13, respectively." The stud 27 may extend through a slot 29 in the casing 11 and the stud 28inay extend through a slot 31.

The mechanism above described will op- V crate to lift a load placed upon the saddle 15 and to hold the load in an elevated posi tion.

Forthe purpose of attaining a reverse or downward movement of the lifter bar 14, mechanism (see Figs, 3 and 4)" including a double arm lever member 32, a cam, member 33 and-a reversing lever 34, are provided. These elements may be mounted as a unit on a journal plate 34 (see Figs. 5 and 6). The lever member 32 may be rotatable about a pin 35. The cam member may be rotatable about a pin 36 and the reversing lever may be pivoted on apin 37. The journal plate may be provided with raised portions or bosses 35, 36, and 37 as bearing surfaces for the members 32, 33, and 34, respectively.

These bosses also serve to provide space for the respective springs for the said members, thus avoiding the necessity of providing a. hub on the movable members and permitting the members to be punched and formed from sheet metal.

The pins which serve as pivots for the several elements of the reversing mechanism may, as shown, be provided with suitable heads at ends thereof,-the opposite ends being upset or riveted over in the usual manner to retain the members in operable relation on the journal plate 34. This plate may be provided with extensions or ears 38 and 39 having holes 41 and 42 arranged to coincide with tapped holes 43 and 44 in-the casing 11 whereby the journal plate 34 may be secured to the casing. When the reversing unit is fastened to the casing the studs 27 and 28 extend through apertures 45 and 46 in the journal plate 34. The stud 27 is thus positioned in operative relation to an arm of the cam member 33 and the stub 28' in operative relation to an arm 48 of the lever member 32. The lever member is provided with a spring 49 which normally urges an end of an arm 48 of the lever member against the stud 28 and as the spring 49 is stronger than the spring 24 the lever member, when free, may act to retain the holding pawl 13 from engagement with the teeth 16 of thelifter bar 14. When the lever member is free to act, therefore, the lifter bar may be dropped by disengaging the lifter pawl 12 from the teeth 16 to lower the bar when no load is being supported as will be later described.

As shown in Fig. 4, however, when the jack is to be actuated to elevate a load the cam member 33 is oscillated to bring arm 47 thereof into engagement with an arm 52 of the lever member 32, causing a. release of the holding pawl and permitting it to act under the energy of spring 24 to engage with the teeth 16 of the lifter bar. The cam member 33 is actuated by the reversing lever 34, a cam arm'53'of which makes contact with an ofiset' straight surfaced flange 54 at an end of an arm 55 ofthe cam member 33. The reversing lever is also provided with a straight surfaced end 56' which, as shown in Fig. 4, when engaged with the flange 54, serves to lock the cam member in engaging position with the lever member 32 in opposition to the action of a spring 57, acting to cause a movement of the arm 47 of the cam thereon.

The stud 27 projects, from the casing ll and an end thereof is disposed in the path of movement of the arm of the cam member 33 but-outof the path of travel of the arm 53 of the reversing lever3t, the flange 54 being provided so that the reversing lever may engage the cam member while out of the plane of the body thereof. I i

The action of the stud upon the cam member is to provide for the step by step lower ing of the lifter bar when a load is supported If the reversing baris left positioned as shown in Fig. 3 and a load is carried by the jack, the engagement between the detent 13 l and a tooth of the lifter bar will retain the detent 13 in position to support the load although the lever member 32 iseXerting a force to remove the detent. hen in this position, a downward movement of the lever 19 will cause the lifting'pawl toraise the lifter bar and-release the detentwhich instantly disengages from the lifter bar. This movement of the lifter bar obviously occurs while the lifter pawl is engaged with a tooth ofthe bar and the saidpawl is moved upwardly. A downward movement of thepawl causes the stud 27 thereof to engage with a round ed surface. 55 of the cam.member 33 efiectmg a movement of thls member causing 1t-to engage with the lever member32. 7 The lever member is thus released from engagement,

with the detent 13 and the same immediately returns and engages with a tooth of the lifterbar. The engagement between the stud 27 and the curved surface ofthe cam member is with a tooth of the lifter bar and theload thereon results in sufficient frictional engagement to prevent the lever member 32 under the action of its spring from removing the detent until as above set forth the lifter bar israised' by a downward movementof the detent 13 from engagement with ,the'teeth of the lifter bar assuming that the said bar does not support a load. The free movementof thelifter bar is thus evident. Therefore, if

no load is carried,;the detentwill' not be held I V in engagement withthe teeth 16 owing to the action of thespring'49 ofthe lever, mem ber 32 andthe lifter bar will drop when the lifting pawl is. movedoutzof engagement .with the teeth of the lifter bar by an actuation of the lever 19 as shown in Fig. 5. A suitable cover plate.58, as shownin Fig. 2, may be provided to enclose the reversing mechanism, slotbeing formed'toqallow for the movement of the hand piece 61 of, there versing lever.;

As shown,the present invention provides a reversible jack which maybe constructed to a great extent of stampedor pressed metalby punch and die operations. Furthermore, the assemblyof the parts isgreatly simplified.

' The jack is easily operated and when desired the lifter bar may .be freely'moved upwardly or downwardly, a load being thus lifted or lowered step by step 1 atwill or the bar may be dropped. 7 I

The control ofthe holding pawl'by changing its operative relation to the lifter bar is accomplished by the simple reversingmechanism shown. r I P? Although a preferred embodiment of the invention has been described: and illustrated, it is obvious to those skilled in the art that modifications thereof may be made, however, it is contemplated by me to include suchmod ificationsas come within the spirit andscope ofthe invention as definedbythe appended claims' 1 What is claimed is;

able with-said detent, a spring for rocking said lever member about its pivot tomove thejdetent away from said lifter bar, a piv oted' :double arm cam-member having one arm engageable with the lever member, a reversing lever to engage with the otherarm:

ofthe cam member to actuate thesame and cause an actuation of the lever member.

2.1; lifting; jackcomprising a toothed lifter bana holding detent, a hand lever with a lifting pawl pivoted thereon, a'spring for normally pressing the detent toward said lifter bar, a pivoted lever member engageable with said detent, a spring for actuating said lever member to hold the detent away from the lifter bar, a pivoted cam member engageable with said lever memberga reversing lever, said cam member being f disposed intermediate to and in operative relation with said lever member 'andsaid reversing lever. 7 v I 1 3. A lifting jack comprising. a toothed lifter bar, a holding pawl, a lifting pawl, tensional members' for normally pressing said pawls toward said lifter .bar, a hand 1. A lifting jack comprising a toothed lever associated with said lifting pawl to effect an upward movement of said lifter bar, a" stud projecting from each of said paw'ls, reversing mechanism comprising a double arm lever pivoted adjacent to said holding pawl, a spring for normally rotating said lever to move one'arm' thereof into'contact with the stud of said holding pawl, said spring having a greater force than the tensional-member of said holding'pawl, a cam member pivoted adjacent to said lifting pawl, said cam member having a cam arm and a lever arm,- a spring for normally moving said cam member to urge an arm thereof out of contact with the other arm of said double arm lever, the cam arm of said cam member being disposed in the path of movement of the stud in said lifting pawl and a pivoted member having an extended portion thereof engageable with the cam arm of the cam member to-actuate said reversing mechanism.

' 4. Reversing mechanism for a lifting ack having a toothed lifter bar and holding detentnormally disposed in engagement with said bar, said reversing mechanism comprising a journal plate, a lever member, a cam member, and a reversing lever pivoted in operat-ive relation upon said plate, said plate being attachable to said casing to position said members in operative relation to the detent of the jack, means for normally urging the lever member into contact with said detent, and means on said reversing lever for locking the same in engagement with said cam member to hold the lever member out of engagement with said detent.

5. Reversing mechanism for a lifting ack having a casing, and lifting means within the casing, said lifting means including a toothed lifter bar and a holding detent, said mechanism comprising a journal plate, a lever member a cam member and a reversing lever pivoted in operative relation upon said plate, said plate being attachable to said casing to position said members in operative relation to the outwardly extending portions of said lifter means. i

6. A lifting jack comprising a toothec lifter bar, a holding detent, a stud uponsaid detent, a hand lever with a lifting pawl pivoted thereon, a stud upon said pawl, a spring for normally pressing the detent toward said lifter bar a pivoted lever member engageabl'e with the stud on said detent, a spring for rocking said lever member to engage and hold thedetent away from the lifter bar, an oscillatory cam member engageable with said lever member to rock the same upon engagement with said detent, a reversing lever engageable with said cam member to oscillate the same to cause a disengagement of said lever member with said detent, and an arcuate surface upon said cam member engageable with the stud on said pawl to cause a movement of the pawl away from thelifter bar when the hand lever islifted;

7. A lifting ack comprising a toothed lifter bar, a holding detent, a spring fornormally IDOViIlg said detent toward the teeth of said lifter bar, a hand lever with a lifting pawl pivoted thereon, reversing mechanism for said jack including a double arm lever number having one'arm engageable with the detent, a pivoted double arm cam member having one arm" engageable with said lever member and the other arm having an arcuate surface, a reversing lever engageable with the last-mentioned'arm of said cam member, the arcuate surface of said arm serving to guide the lifting pawl from engagement with the rack upon a downward movement of said pawl causing the loadpto be supported on said'detent, and a spring for said lever member.

8. In combination with a jack including a casing, a toothed lifter bar slidable therein, a pivoted hand lever, and a lifting pawl and a detent cooperating with said lifter bar to effect a step by step projectile movement thereof during oscillation of said" handle, a detachable support plate mounted in said casing, a reversing mechanism comprising a plurality of cam member pivoted in the sup port plate in position to cooperatively interengage, and a camcontrol lever pivoted in said support plate, certain of said pivoted members being arranged to engage and contrel the pawls for causing said pawl and detent to effect a step by step retractile movement of said lifter bar during oscillation of said handle.

9. In combination with a jack including a casing, a projectile and retractile lifting bar and means to effect a step by step projectile movement of said bar, said meanshaving portions projecting from the casing, a reversing mechanism comprising a detachable plate mounted in said casing, a plurality of cam member's pivoted in the support plate inposition to co-operatively inter-engage and a cam control lever pivoted in said detachable plate,-certain ofsaid pivoted members being arranged to engage and control the proj ecting portions whereby to co-operate therewith to cause the same to effect a step by step retractile movement of' said bar, said reversing mechanism being formed as a unitseparate from said jack and being attachable to and detachable from said jack casing as a unit.

10. In combination with a jack includinga projectile and retractile lifting bar' and means to effect a'step by step projectilemovement of said bar; a reversing mechanism attachable to and detachable from said jack as a unit, said mechanism consisting of a plate and a plurality of pivoted control cams carried thereby arrangedto cooperate with each other and with the step by step bar provoted in said plate for manipulating said con- I trol cams.

11. In combination with a jack including acasing, a projectile and retractile lifting bar supportedin the casing, means for affecting; a step by step projectile movement ofsaid bar, said means having portions extending through the casing and reversing mechanism comprising a pivoted cam member having a portion arranged to engage a projecting porprojectile movement'of the bar, a second pivoted cam member having a portion adapted V to engage a second projecting portion, and a portion adapted to'co-operate withvsaid first mentioned pivotedcontrol member whereby to release it from contact with said first men-V, tioned projecting portion, and a control lever adapted when in one position'to engage and fasten said secondvmentioned pivoted cam' to cause the same to release the projecting portion of said means and to engage the first mentioned cam to cause it to release the-corresponding projecting portion of said movement causing means.

means for governing the operation of said means comprising a journal plate detachably mounted to said casing opposite'the' said de-Y tents, a spring pressed control cam lever for said holding detentcarried in said journal plate in position to engage and normally'urge said lifting detent away from operative position, a second spring pressed control. cam lever having a portion normally positioned to engage and control said lifting detent to 7 move in a pre-determined path during its operative movement, said second cam memtlonof said means for effecting, step by step, her being rotatable to release said lifting detent for movement along another pre-deter-.

mined p ath,. and having a portion to c0 op-' erate with'the first or holding detent control lever,whereby"upon movement of the former to release the lifting pawl, the latter is moved to -release'the holding pawl, and a pivoted lever for moving and locking said second pivoted controlcam. 1 In testimony whereof I afiix my signature.

7 ADOLPH PETELER.

12. The reversing mechanism fora lifting l jack having a casing, a lifter bar arrangedv in the casing for projection therefrom and lifting means arranged within the casing and adaptedto project and retract the lever bar,"

said lifter means having portions projecting through the casing, said reversingmechanism comprising a journal plate adapted for attachment'to said casing, controlmembers pivoted inoperative relation upon said plate and in position to co-operate with each other projecting portions of said liftermeans, said journal plate beingprovidedwith bosses on which said members are journaled.

13. A lifting jack comprising a casing, a toothed lifter bar supported in the casing, a holding detent, a hand lever, a lifting pawl actuated bythe hand lever, said hand lever and said holding detent being pivoted in the jack casing, and a springarranged to nor- 'mally urge the holding detent and the lifting pawl into-engagement with the lifter bar,- a i I v reversing 'mechanismfor controlling; the-f J holding detent andthe lifting pawl, said mechanism comprising members normally urged to operative position by spring means 7 ofsufiicient strength to counteract the efiect' of the first mentioned spring, and means for 7 locking said members against the normal urge of said spring means;

1 14:. In a jack a casing, a. toothed lifter bar f i in the casing, means for actuating said lifter bar including a liftingdetent, a holding de arranged for axial'projectionand retraction

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