US1452236A - Lifting jack and hauler - Google Patents

Description

Apnf. 17, 1923.

c E. cLEws ET AL LIFTING JACK AND HAULER Filed June e, 1922 HILL Patented Apr. 17, 1923,

Aum'rEo srarEs :Param orales.

` CHAELES EDMUND cLEws AND ARTHUR WYNDHAM EEEEE, E AUCKLAND, NEW

ZEALAND, AssIGNoEs To PEECY NicHoL KINeswELL, or AUCKLAND, NEWy ZEALAND.

' LIETING JACK .AND HAUEEE.

Application filed 2l une 6,

To all 'whom t may concern.'

Be itA lmown that we, CHARLES EDMUND CLEws and ARTHUR WYNDHAM BEERE, both` citizens of the Dominion of New Zealand and subjects of the King of Great-Britain, and residing at Prospect Terrace,jPaeroa, Auckland, and rProspect Place, Auckland, respectively, both in the ProvincialDistrict yof Auckland, have invented certain new and l0. useful Improvements in Lifting Jacks and Haulers, of which the following isa specification. o

This inventionrelates to jacks for lifting i improvements, whereby the jack constructf ed and oper-ated as described in the aforesaid specification will be rendered more positive in its action thanheretofore, besides which the operation of the jack will be facilitated and the latter given longer life.l

The main feature of the invention is the fprovision of means for ensuring the engagement and retention in the rack or spear or the chain, in a positive and certain man-I `ner whenever required of thek pawl employed for holding the load. while the grip, of said rack or spear or the chain, by the pawl on the operating leveris being changed.

l This-is enabled to be done by constructing and mounting the operating lever of the jack, so that its, inner end, when moved f downwards will bearjagainst and force the load holding kpawl intok engagement-with the rack or spear or the chain, such enson gagement being ensured and continued ydur-f ing the time that the pawl on the operating lever is disengaged from the rack or spear or the chain.

AQ .further feature of the` invention is the provision on the inside of the casing at the side against which the rack or'spearA yor the-chain is forced by the actionof the ,pawlsof.af Vertical rib or stripat each side ofwhich thelinks of the chain, when the latter is employed. pass, the rollers of the chain bearing' yagainst the rib or strip ys las to facilitate movementof `the lchain through theA casing; and. givingk longer. llfe 1922. semi No. 566,291.

to the latter and the-chain than where the lmljzs are forced hard into contact with the casing side. Owing to the insertion of the rib or strip in the casing, it becomes necessary to groove or recess the rack or spear, in orderk thatsamecan be used in place of the chain.

Referring to the accompanying drawing in conjunction with which'the invention will be more particularly described `Figure 5 is a similar view of Figure 4, but

showing a chain in the jack. y

In the drawing 1 is the casing, 2 therack or spear.y3 vthe chain and 4 the guide between whichand the casing side the rack or spear 2, or the chain 3 works. 5 is the operating; leverfulcrumed at 6 to the casing, and 7 is the pawl carried by said lever. 8 is the pawl used for holding' the load during the time the' grip.' of the rack or spear 2 or the chain 3 by the pawl 7 is being changed. k9 is the yrocking arm carrying .springs y10, 11, 12, and mountedv and adapted to be operated forl the purpose set forth as describedk in the before mentioned specification. y

rl`he inner orfforked end 5a of the operating lever 5 inwhich the pawl 7 is pivoted is bevelled and hask its lower corners rounded as shown so that on downward movement of said forkedend 5a occurring the latter makes contact with and fits against ran inclined surface 17 on the back of the upper end ofthe pawlS. f y l The opening` 18 at the top` of the casing `through which the rack orspear 2, or the ychain 3 passes has at one side an under cut or*z inclined surface19, between which and vthe upperk portion of the pawl 7 an upwardly curved spring 20, secured to the inside of the upper endv'of the casing 1 projects. j `0n the inner side of the side lof the casing 1. a vertical rib or strip 21-is providedywhile at the top of said sidey 1a a roll or outwardly and downwardly bent por- .,tion 22 is formed, over which the chain (when used) hangs as shown; i y

Figure lis a sectional elevation of the the side l, by the action of the pawls 7, 8.

The raclror spear is grooved as at 24, to enable it tok accommodate the rib or strip 21, thereby enabling either'the rack or spear, or lthe chain to be employed as desired.

To use the jack forlifting or hauling pun poses the handle 16 is operated to' lcause the Vsprings lO and 1l` to press against the. tail ends of the pawls 8 and 7 as shown in Figure l so thatthe upper ends 8a" and 7a of v" rsaid pawls normally engage in theteeth 2a,

or in the chain, according to which is em- The outer endof the operating lever is then worked upwards and downwards and on downward movement of the pawl 7 taking place, the upper end 7 a of the latter slips down over the teeth a or over the roller l` 3a of rthe chain 3 the upper end 8a of the pawl 8 being in ythe meantime forced by the 'spring lOand inner end 5' of the lever 5 into the teeth 2a orinto the chain 3 to hold ythe rack, spear, or the cliainagainst down-I ward movement until such tiine as the up- 'pe'r end 7a of the' pawl 7 is again inserted in the teeth 2a or grips the cha-in 3, on the outer end of rthe operating lever 5 being depressed to force the rack or spear 2 or the chain 3 through the casing l.

*tion shown in Figure 2, with the springs 11,

l2 pressing against the tails of the pawls 8 and 7 respectively, so that normally the upperend 8fL and 7a of said pawls will be kept from engaging, or will be clear of the rack or spear 2, ortho chain 3.

@The operating lever 5 is then worked up'- wards and downwards as before, upward,- movement of the pawl t portion to make contact with the spring 20,

4whereb)7 the end 7a 0f Said Paw1 ls forced to engage inthe teeth 2@L of the rack or spear 2, i or to Agrip a roller 3a of the chain 3 as the f. case may 'be and to raise said rack or spear,

Ar end 8a or the chain suiliciently to enable the upper free itself vfrom said rack or spear 2 or the chain 3, under the influence of the spring ll.

lthe rack or spear 2 in the casing l.

as the ma sa ail-fred @sa 5a er steeper? causing its upperk of the pawl 8 to spring out of or towbeing lowered.

, or the 'chain 3 tode'scend ating lever 5 descends, it makes `contact with the surface 17 on the back ofl the pavvl 8, and forces the upper end PrL of the latter into the teeth 2a ot therack or spear 2 or so as to grip a roller 3f* of the chain 3. The pawl 8 now takes the weight or" the loadand` the Continued downward movement of the end 5'rl ot the lever 5, results in thepawl 7 'being lowered, until its upper end 7L is enabled to spring out of and clear the teeth 2a, or the chain 3 yas the caseniay be, the yend 5LL meanwhile'bearing against andretaining the upper end Sa of thefpawl 8 in engagement 'with the' teeth 2l'ofthe "rack or spear or in the chain 3Q Follow'ingthis' lthe iniieneiid 5,of the lever 5 is Vraised again to enable the'pawl 7 to obtain a` fresh gripfof therack or spear. or or' the chain, tlietresh gripby the pawl 7 being obtained before `the lend 5 of 'the 'l'ever` clears the back ol" the pawl S'suiliciently, to enable the latter to springorfcoine out of engagement withfthe'i rack or spear, or the -chain,`"should""by any cl'i'ancethe weight of ythe load bev eren momentarily taken off 'said paw/l 8. y,

llhile the weight of; 'the load isfbeing borne by the pawl 8, the load issa'felyyh'eld,

,as owing to the end 51 of the lever be-` ing againstfthe lever 8,' the latter must remain in'the 'teeth 2a or inv the",y y(':l'iain 3 against `the `action of vthe spring 11'e'ven should the rack or [spear orthe Vchainbe relieved of downward pressure. l

If thelever 5v be yaccide'ntallyl moi/'ed to thel position where f its"end 5a clearsthe lever 8, the load y"cannotrim-'pany' appreciable "extent, because inV Athis posit-ionI the pawl 7 is" engaged in y'the'teeth 2a' orfin the In order to enable a load to be loweredHy *"gradualljg th'ereversing handle 16, is oper! ated tobring the rocking arm` 9 to the posichaini,r4 and the slightest downward movefinentr of said lever 7 ,"has 'the effect of irnvthrough a casing; a pawl pivoted to the latteradapted to hold'said member against theweight: ot'the loadI `borne thereby; an .operating lever pivoted to said casing carrying at one' end a pawlada-pted 'to engage and operate said nieniberg'said leverhaving its pawl carrying end formed yto Iforce the load holding pawl into engagement with the load bearing ineinber. on said inner end I 2. Apparatus the kind described, ic'omy"p'rising a? casing vwith an internal 'rib' or strip on *onev side; a load 'bearing `member with side portions which pass at veach side Vof .said `libf ory Operable through. Said Carnes a, paw/11 with an maimed upper-Sup ifaicehpwd to the lm-375 adapted" to' hold said member against the Weight of the `load borne thereby; an operating lever pivoted to said casing and having a bevelled and forked inner end in which a load shifting pawl is pivoted; said inner end being positioned so that on being lowered it engages the back of the load holding pawl and forces same into engagement with the load Carrying member.

3. In apparatus of the kind described, wherein a load shifting paWl and a load holding paWl are employed; an operating lever carrying the load shifting paWl, and having` its inner end formed to force the load holding paivl into-engagement With` the load bearing member, on said inner end being lowered. l

ll. In apparatus of the kind described wherein a load shifting paivl and la load holding paWl are employed, an operating lever with a forked inner end in which the load shifting lever is pivoted, the ends of said fork being bevelled and provided with rounded lower corners; an inclined surface on the back of the upper portion of the load holding paWl, against Which.` the forked end of the operating lever makes Contact,l

and forces said paivl into engagement with against said casing side, and provided With' side portions which pass at each side of the rib or strip.

6. In apparatus of the kind described an internal rib or stripI at one side of the easing and a roller chain Working through the easing against said side, so that the rollers run against said rib or strip and the links pass at eaoh side thereof.

In testimony whereof We have signed our names to this specification in the presence of two witnesses. l s

CHARLES EDMUND CDEVVS.

ARTHUR WYNDHAM BEERE. Witnesses IVILLIAM PoRloHns,

DOUGLAS ERROE GRAY.

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