US1333239A

US1333239A - Lifting-jack

Info

Publication number: US1333239A
Application number: US304198A
Authority: US
Inventors: Laurence J Berkeley
Original assignee: Walker Manufacturing Co
Current assignee: Walker Manufacturing Co
Priority date: 1919-06-14
Filing date: 1919-06-14
Publication date: 1920-03-09
Anticipated expiration: 1937-03-09

Description

L. 1,; BERKELEY. Umm; JACK. AFPUCATIION FILED JUNE I4, i99.

2 sHEEIs-'SHLET z.

mmm Mur. 9, 19201 LIFTING JACK.' APPLICATION FILED )UNE I4. 1919.

Patented Mar.

w Q IAMN f liz-III.

2 SHEtTS-SHEH 2.

UNITED sTATEs rATENT OFFICE.

LAURENCE J. BERKELEY, OF RACINE, WISCONSIN, ASSIGNOR TO WALER MANUFAC- TURING COMPANY, AOF RACINE. WISCONSIN, A CORPORATION OF WISCONSIN.

LIFTING-JACK.

Specification of Letters Patent.

Patented Mar. 9, 1920.

Application filed .Tune 14, 1919. Serial No. 304,198.

Be it lknown that I, LAURENCE J. BERKE- LEY, a citizen of the Unit-ed States, residing at Racine, in the county of Racine and State of Wisconsin, havclinvented `certain new and useful Improvements in`Lifting- Jacks, of which the following is a specification, reference heilig had to the accompanying drawing, forming a part thereof.

The main objects of this invention are to produce a lifting jack which can be conveniently operated at a distance from and clear of the load which it lifts and the operating connections ofwhich can be readily shifted out of the way, as for example, for working on the loathsuch as an automobile or other vehicle, while supported by the jack; and generally to improve the construction and operation of devices of this class.

It consists-in the .censtruction, arrangement and combination of parts as hereinafter particularly described and pointed out in the claims.

In the accompanying drawing like characters designate the same parts in the eral figures.

Figure l is a side elevation of a lifting jack embodying the invention, showing the lifting member raised and the hand operating lever extended and turned down and locked for holding the liftingl member and The frame or body of the jack its load in an elevated position; Fig. 2 is a plan view of the jack show-ing the parts in positions corresponding with those shown in Fig. 1; Fig. 3 is a reverse side elevation of the jack showing the lifting member lowered and the hand ojierating lever folded down thereon; Fig. 'l is a vertical cross section on 'the line Fig. 3; and Figs. 6 and 7 are detail views on an enlarged scale showing the flexible thrust member and associated parts of the jack, Fig. 5 being a vertical longitudinal, section on the line 5-5, Figs. 6 and 7, Fig. 6 a cross section on the line'-G, Figo, and Fig. 7 a horizontal section on the line 7-7, Fig. 3.

comprises a hollow upright post or standard 1 which is .formed or provided adjacent its lower end/with-ahorizontal or lateral.extension 2, and serves to firmly vsupport the standard 1 in operative position and to carryin a conveniently accessible positionihe levers for operating the lifting member of the.jack.

f ,The jack -may be, and is preferably,

supported on the jack. To this end a pair.

oftruck wheels. 4, are mounted on the ends of a transverse axle 5, carried by a bracket G, which may be cast as shown, onthefront side of the standard 1 adjacent its lower end. .1t its opposite or rear end, the eX- tension 2, which is preferably curved upwardly as shown in Figs. 1 and 3, is supported on a caster wheel 8, the 'frame 9 of which is swiveled in a hub 10 formed with the extension 2, ball or roller thrust bearings being prefe ably provided between the hub and vcaster frame. as shown in Fig. 4:.

` The standard '1 is formed with ai vertical .guideway in which a sleeve 12 is tit-ted. A

lifting member, which may consist as shown, of a ratchet bar 14, provided atits upper end with a swivel plate or bearing 15, isd

slidably fitted and movable vertically in the sleeve 1Q, or with the sleeve in the standard 1.

An elbow-shaped guide conduit 17 isi A jointed or flexible thrust member is guided and movable lengthwise in the conduit 17 around the turn or bend therein, and is connected. or engaged at its front end with the lug 19. This thrust member may consist as shown, of rollers 2:2, connected in pairs by axles 23 and spacing links :24, ar-

ticulat'ed with the roller axles, as shown in Figs. 5, 6 and 7, the rollers and links beingyieldingiy held together by a spiral. spring; 25 connected at the ends with the axles of "the end rollers and confined in grooves in the under sides of' the links.

The axle of the rear ,end rollers 2,3 is ex-A tended and passes freelythrough horizontal sis slots 27 in the sides of the extension 2. The projecting ends of the rear axle 23 are connected by rods 2S on opposite sides of the extension 2 with the lower ends of branch arms 2Q of a forked lever',- which is fulerumed on studs '30 projecting from opposite sides of the hub l0 adjacent the rear end of said extension. The b 'anch arms 29 of the lever', preferably made separate :trom 'each other, are bolted together above the hub l0, and torni at their upper ends a socket 'for a handle or lever arm 31, as shown in Figs. 2 and i. The handl" arm 31 is pivotally and slidably connected with the upper ends of the branch arms 29 by a pin 32, fastened at the ends in the branch arms and passing through a longitudinal slot in the handle arm, so that the handle arm may be withdrawn it'rom the socket and folded down out of the way on the swivel plate l5 oi the liliting member, as shown'in Fig. 3, when the jack is not in use.'

A hook-shaped pawl 34, pivotally connected with the branch arms 29 above the extension is adapted to engage with a ratchet segment formed on or attached to the e`.\;tension,` to lock the hand lever and hold the lifting' member with a load restingv thereon. in a n elevated position, as shown in Fig. 1. The ratchet segment is provided with a lug or shoulder 37, with which the pawl 554 engages to lock and hold the fork arms 29 of the lever in an upright position when the handle arm 31 is withdrawn from the socket at their upper ends and turned down, as shown in Fig'.

A springBS connecting the pawl 34 with one ot the branch arms 25). tends to hold the pawl in engagement with the ratchet segment 35.

The arm 3l is provided adjacent its outer end with a transverse handle bar 39 and with a. sleeve or collar l0, slidably mounted thereon and connected by a jointed rod 41 with the pawl 34. The joint in the rod #il in'approximate alinement with the pivot pin 32 ot the handle arm, and the section ol' the rod which is connected with the sleeve 4:0 is guided ou the handl, arm adjacent to the joint in the rod, as shown in Figs. 2, 3 and el. rl`he Sleeve, l() is' provided with a handle or' `e'rip 42, adjacent to and parallel with the handle bar 539.

To enable the operator to quickly raise the lifting member to the starting' point in engagement with a load' preparatory to lifting the same with the handle al'm 31 ot the main opi-.rating lever, the jack is provided with a 'toot lever 4l. tuh'rumed on one ot the Studs l0 and extending' normally alongslde the extension 2 'to the lower part ot' the" standard l. where it is held in place' and guided by a vertical keeper l5. formed on or attached to one side ot the standard. as shown in Figs. l, 3 and 7; The ratchet bar lowest or normal position, therein, as shown in Figs. 3 and 5, the pawl is provided with a pin or stud l5), projecting' laterally there from through a vertical slot 50 formed in the adjacent side of the standard, as shown in Fig'. This slot is formed with an enlargement at its lower end to permit the disengagement of the pa wl 20 from the ratchet bar lei. only when the sleeve 12 is in its lowest position, as shown iu Fig. 5, the pawl being held in engagement with the ratchet bar and prevelu'ingl accidental release ot' the load by the engagement ot' the pin or stud 19 with the rear side` ot the slotl when the sleeve'isv' elevated.

To taclhtate dlsengagrement of the pawl 2O Atrom the ratchet bar when the sleeve 12 has been lowered 'with the load, a` lever 52, pivotally mounted on one side ot the standard 1 and extending at its upper end abovethe lower end' of the `slot 50. is connected at its lower end b v a rod 53 with an angular toot lever Si. pivotalljY mounted on the extension 2 adjacent its rear end. A spring` 55, connecting the lever' 52 above its itulcrunr with the bracket G, holds said lever normally against a stop 5G, with its upper end in trout ot' the lower end of the slot 50 and out ot' the path of the piu 49, as shown in Fig'. 3.

in the operation ot the jackv` as in lifting a vehicle t'or example, the standard 1 being brought into position underneath the part ot' the vehicle to be engaged by the lifting` member, and the extension 2 carrying the operating' levers being' directed (iutwardly trom the vehicle into a clear space, the ratchet bar 12 is elevated to the starting' point. bringing the bearing' platt` 15 into engagement with the vehicle b v depressing' the pedal ot' the toot lever il, which operates directly on the ratchet bar b v engage ment with the pin -l-i', the ratchetbar being engaged and held in its elevated starting position bythe pa wl 20. The handle arm 3l being' turned up into alinement with the branch arms 29 and thrust into engagement' with the socket between them. as shown in Figs. 1. 2 and l, and unlocked by withdrawin r the pawl--ltrom enga-rement with the lug' ST. is turned outwardfand downward. to or toward the position in which `it is shown in Figs. 1 and 2. thereby operating through the counerting' rods 2Sv and flexiblethrust member 22 23-24. against'the lug' 19 on the sleeve 12` to raise the sleeve with the lifting' member 14-15and litt the load resting' on the bearing; plate 15. The liftingl member with the load, is locked and held in elevated position by engagement of the pawl 34 with a tooth of the ratchet seg ment The extension 2, with the operating levers and connections carried thereon, may then be swung` on` the caster wheel 8 and truck wheelsl, underneath the vehicle out of the way, the bearingplate' 15 swiveling -on the ratchet bar la. The extension 2 and the connections between the operating levers and the lifting member being located close to the floor, will pass underneath a wheel or wheels oil the vehicle when it is elevated but a short distance from the floor. i

To lower the load and remove the jack therefrom, the extension 2, is swung out wardly into clear position, the pawl 34; is withdrawn from engagement with the ratchet segment 35 by the operatordrawing the handle 42 toward the handle bar 39, and the load is lowered with the lifting member and sleeve, under control of the lever arm 31 held by the operator. lVhen the sleeve 12 reaches its initial position, as shown in Fi gs. 3, 5 and 6, thereby returningthe lifting member to the starting point and relieving it of the load, which then rests onO the floor, the pawl 20 is thrown out of engagementl with the-ratchet bar 14 by -depressing` the foot lever 24, and the 'lifting member then drops in the sleeve l2 into its lowest position, the leve-r arm 3.1 being turned into an upright position. The lever arm Bt may then be withdrawn from the socket in the branch arms Q9 and folded down out of the' way on the bearing plate l5, shown 1n Fig. 3, the branch arms Q9 o't the lever being l locked and leld in an upright position by engagement of the hooked pawl 34 with the lug 37.

Various changes in the details of construction and arrangement of parts may be made without departure from the principle and scope oit the invention as defined in the following claims.

I claim: A

l. ln a lifting jack the combination of a standard having an elbow-shaped conduit, a lifting member guided in the standard adjacent to and parallel with a part of said 'conduit, a thrust member guided and movable lengthwise in said conduit, means for releasably connecting the thrust member with the litt-ing member, and means 'for applying pressure to the thrust member to operate the lifting member.

2. In a lifting jack the' combination of a standard having an elbow-shaped conduit, a lifting member guided in the standard adjacent to and parallel with a part of said conduit, a flexiblyv jointed thrust member guided and movable lengthwise in said conduit, means for `adjustablv connecting one/ end of the thrus j member with the lifting member, and means for manually exerting pressure on the other end of the thrust member to operate the lifting member.

I 3. In a lifting jack' the combination ,of a

standard having a guideway 'and an elbowshaped conduit part of which is adjacent to and parallel with said guideway, al sleeve fitted and movable lengthwise in the guideway, a lifting member fitted and movable lengthwise in the sleeve, means for adjustably connecting the sleeve with the lifting member, a tiexible jointed thrust member confined and `movable lengthwise 'in said `ronduit and adapted to engage at one end' with a part of said sleeve, and means for'.

end of the thrust member with the lifting member, and a lever mounted on said extension and connected with' the other end of the thrust member.v

' 5.`In a lifting jack the combination of a standard having an elbow-shaped conduit, a lifting' member guided in the standard adjacent to and parallel with a part of said conduit, a flexible thrust member guided in said conduit and cou'iprising rollers and Spacing links, means' for connecting the thrust member at one end. with the lifting member, and means for exerting pressure on the other end transversely to the standard.

G. In a lifting jack the combination of a standard having a lateral extension forming therewith an elbow-shaped conduit, a lifting member guided. in the standard parallel with a part of' said conduit a flexible thrust member guided and movable lengthwise in said conduit around the turn therein and comprising rollers connected in pairs by axles and spacing links between the axles, a spring connecting the end roller axles of the. thrust mendacin'lcans forconnecting the thrust member at one end with the lifting member, and means for applying pressure to the other ond oi' the thrust member toward and transversely to the standard.

7. ln a lifting jack the combination of a stamlard *formed withl an elbow-shaped conduit, a sleeve guided in the standard parallel with a part of the conduit and provided vwith a lug projecting into the conduit, a ratchet bar guided in the sleeve, a pawl mounted: on the sleeve for engaging and lifting the ratchet bar, a {iexible'thrust mem to engage at one end with the lug' on theI sleeve, and nieaiisI for applyingpressure to the othei' end of the thruet nieinber toward and traneverselv to the sleeve and ratchet bar.

8. In a lifting jack the coinbiuatioii of a standard forii'ied in one Side with a 'vertical slot having,l an enlargement adjacent its lower end, a sleeve guided and inovable lengthwise in the standard, a ratchet bar guided and iiiovable lengthwise-in the sleeve, a pawl pivoted on the Sleeve and provided with a pin working' in the slot in the Standard and adapted to hold the pawl in engagement with the ratchet bar except when the pin is lowered with the sleeve and pawl into a position oppoeite the enlargement ot' the Slot, means for Aquicllj raieine' the ratchet har in the sleeve, and ineans for raising' and lowering' the sleeve with the ratchet bar 1n the stai'idard.

9. ln a lifting; jack the combination ot a 'Standard provided adjacent its lower' end with a lateral extension forming` therewith an elbow-shaped conduit having' an upright part, a ,vertically movable lifting ineiiiber ,e'uided in the standard parallel with .the upright part of the conduit therein, a flexible thrustineinber guided and movable lengthwise in said conduit in, ineana for connecting the thrust ineiiiber at one end with the lifting i'neinber, a lever 't'ulerunied on said lateral extension and connected with theI other end of the thrust incinbe and nieanay For locking the lever for holding, the lifting' nieniber atditl'lerent elevations.

lO. In a lifting jack the combination ot' a Istanda il having a lateral extension forniing the ewith an elbow-shaped conduit having anvv upright part, a sleeve guided and inovahle lengthwise in the Standard parallel with the upright part ot the conduit therein. a lifting nieinber guided and movable lengthwise in the Sleeve, ineans for adjustablj' engaging; the sleeve 'with the lifting around the turn there.-

ineinber, a flexible thi'unt ineniber `guided and iiiovable lengthwise in said conduit around the turn therein and engaging atone end with the sleeve, a lever mounted on ISaid extension 'torl quickly raisinpr the lifting iiieiiibei' in the sleeve to the load, and a lever inounted on said extension and connected with the other end of the thrust ineinber for 'raising' and lowering the sleeve with the lifting; ineniber and load relative to the Istandard.

ll. ln a lifting` jack the combination of a standard havingl a lateral extension forming therewith an elbo\\', liaped conduit, a litting nieinber guided and inovable in the Standard adjacent to and parallel with the adjacent part of the conduit therein, a Hexible thrust nieinber guided and movable lengthwise iifsaid conduit around the tui'n therein. ineans for connecting the lifting ineinhei: Ywith the adjacent end of the thrust nieinberr` and a jointed foldiinc` lever inounted on said extension and connected with the other end of the thrust ineinbei'.

l). In a lifting' jack the combination of a staiidard provided adjacent its lower end with truck wheels and with a horizontal extension forming` with the standard an elbowshaped guide conduit, a caster wheel connectcd with and adapted to support said extension adjacent the end oppoeite the standard` a lifting' ineinberv guided and niovable iii 'the standard adjacent to and parallel with a portion of the guide conduit therein' and provided at its upper end with a Swiveled bearing, a flexible thrust ineinber confined and movable lengthwise in said guide conduit around the turn therein, ineans for at one end with the lifting ineniber, and ineans inouiited on said extension for inanuallj' applying;` pleasure to the other end of the thrust ni'eniber.

In witness whereof I hereto atlix in)l nature.V v Y LAIFRENCE J. BERKELEY.'

connecting the thrust ineinbei"