US1376136A - Lifting-jack and hauler - Google Patents

Description

C. E. CLEWS. LIFTING JACK AND HAULER. APPLICATION FILED 05c. 30, 1919 Patented Apr. 26, 1921.

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CHARLES EDMUND CLEWS, or I-AEROA, new ZEALAND, AssreNoRor THREE-SIXTHS TO PERCY Nicol. KING-SWELL, or AUCKLAND, NEW ZEALAND.

LIFTING-JAGK AND HATILER.

To all whom itmay concern: 1

Be it known that 1, CHARLES EDMUND CLEWs, citizen of the Dominion of New Zealand, residing at Paeroa, Auckland, New Zealand, have invented certain new and useful Improvements in Lifting-Jacks and Haulers, of which the following is a spec1fication.

Thisinvention relates to j acks for lifting and hauling objects and materlal, and more particularly to that class of jack wherein either a rack or spear,,or a chain is employed.

The object of the invention is to provide an improved construction of jack whereby objectsand material may be either lifted or hauled with equal facility. Further objects of the invention are to make the construction and operation of the jacksuch that, while the latter can be used vertically or at an angle for gradually lowering a load, the

tion 7 the upper end 8 of said pawl 7 being rack or chain is permitted to drop or is released immediately the jack is reheved of its load, after which said rack or chain can be readily withdrawn.

The invention also provides for the ready withdrawal of the rack or the chaln from the jack as required when the latter is used horichain in place of a rack.

Fig. 4 is a plan View of the device showing the rack in section, and

vFig. 5 illustrates the use of the jack for hauling purposes.

The device comprises a frame or casing 1 through which either a rack 2 (Figs. 1, 2 a and 4) or a chain 4 (Figs. 3 and 5) passes between one side of the frame or oasingl and v a guide? An operating lever 5 fulcrurned at 6, projects from the frame 1, and carries'at its inner end a curvedoperatmg pawl 7, pivoted near its center, and formed wlth a pro ecshaped as shown to engage either the teeth of the rack 2, or the links of the chain 4.

A pawl 9 pivoted between the pawl 7 and therack 2 or the chain 4 has an upper end Specification of Letters Patent. P te te Apn 5, 1921,

Application filed December 30, 1919. Serial No. 348,375. r

10, also shaped to engage either the teeth of the rack 2 or the links of the chain 4, said pawl 9 being formed with a tail 11.

Below the pawl7 and pawl 9, is a rocking arm 12, from which project upward three springs 13, l4 and 15, the spring 13 being I located in front of the tail 11 of the pawl 9,

or between the latter and the rack 2 or the chain 4 as the case may be, while the spring 14 is between the tail 11 of the pawl 9 and the tail of the pawl 7, and the spring 15 is behind or outside the lever 7.

. The rocking arm 12 is'formed with a slot 16 in which engages a pin 17 projecting from an arm 18 mounted on a short shaft 19 passing through one sideof the frame or casing 1.

A reversing lever 20 on the outer end of the shaft 19 enables the latter to be operated in order that the springs 13, 14 and 15 can be caused to press against the tail 11 of the pawl 9, and the tail of the pawl 7 as required, the pin 17 being locked at both ends of its movements by coming into contact with the ends of the slot 16. j l

The head 21 of the rack 2can be of any desired shape, and friction rollers 22 can also be provided at the top of the frame or casing 1 for the rack 2 or chain 4 to bear against, the uppermost roller facilitating the turning over of said chain when the latter is employed. I 4 v I When using the jack for a verticallift or hauling the reversing lever 20 is first moved so as to causethe pin 17 to throw the rocking arm 12 into the position shown in Fig. 1, with the springs 13 and 14 pressing against the inner side of the tail 11 of the pawl 9, and the tail or lowerportion of the pawl 7, respectively, the spring 15 mean-- while being idle. v

- Theouter end of the lever 5 isthen worked upward and downward and on downward movement of the pawl 7 occurring the end 8 of the latter slips down the teeth of the rack 2 or the links of the chain 4 as the case may be, said end 8 being kept against the rack 2 or the chain 4 by the spring 14. Upward movement of the pawl 7 causes the upper end 8 of the latter to engage in a tooth of the rack 2 or a link of the chain 4 and force said rack or chain upward, or through the'frame or caslng. I i

On the pawl 7 commencing to descend again to obtain a fresh grip of therack or the chain, the upper end 10 of the pawl 9 is forced by the spring 13 into engagement with a tooth or link, whereupon the pawl 9 holds the rack 2 or the chain 4 with its load, until the next upward movement of the pawl 7 takes place.

The downward movement of the pawl 7 when the jack is used for lifting or hauling causes the projection 7 to ride on the pawl 9 and so prevent too low a fresh grip of the rack-2 orchain 4 from being obtained by the upper end 8 of the pawl 7.

The rack 2 is prevented from being raised too high, and so leaving the frame or casing 1, by having a-blank portion 23 at its lower end, the said blank portion 23 being greater than the movement of the end 8 of the pawl 7 To enable a load to be lowered gradually, the reversing lever 20 is operated to bring the rocking arm 12 to the position shown in Fig. 2 with the springs 14 and 15 pressing against the backs of, the tail 11 and the tail or lower portion of the pawl 7 respectively, so that the upper end of the latter and the pawl 9 tend tofkeep clear of the rack 2 or the chain 4.

The pawl 7 is then worked upward and downward as before, upward movement of the pawl 7 causing its upper end 8 to bear against an inclined surface 24 at the top of the device, and to be forced to engage a tooth or a linl ,'whereup0n the rack or the chain -is raised sufficiently to enable'the upper end 10 of the pawl 9 if not already free, to clear itself from said rack or chain, under the influence of the spring 14.

Downward movement of the pawl 7 and the rack 2 or chain 4- supporting the load then commences, and near the end of said movement the projection 7 rides on the end 10 of the pawl 9 whereupon the latter is forced against the influence of the spring 14, into engagement with a tooth or a link, at the "same time the upper end 8 of the ,pawl7 is freed from the rack 2 or chain 4 by the spring 15.

The pawl 9 then holds the load while a fresh and highergrip is obtained by the pawl 7 on upward. movement of the latter again taking place.

Should the load be taken from the rack 2 or the chain 4, when the jack! is set for lowering, the pawl 9 and pawl 7 will both free themselves from the rack 2 or the chain 4, and permit whichever of the latter is employed to drop into theframe or casing '1 or to be released if the jack is being used horizontally.

It should be clearly understood from the foregoing description, that when lowering a load, the engagement of the pawl 7 and contact of the upper end of the pawl 7 against the face 24 and in the case of the pawl 9 by the pressure ofv the projection 7 of the pawl 7 against the end 10 of the pawl 9, as thepawl 7 bearing the weight of the load moves downward.

The pawl 7 and pawl 9 engage the rack or the chain against the influence of the springs 15, 14 respectively, which causes the upper portions of the pawl 7 and pawl 9 top of the-device enables the j ackto be se cured byfmeans of a rope 27 to apost or other stationary object 28. Preferably a chain 4 is used for hauling purposes, said chain being attached either directly to the object to be moved or to a rope 29 connected to same.

When hauling, the lever 20 is manipulated to set the rocking arm 12 and the springs 18, 14 and 15 in positions similar to those occupied by the latter in Fig. 1, and if the position of the rocking arm 12 and the springs 13, 14 and 15 be made to correspond with that illustrated in Fig. 2, the device can be used tO lOWBII an object gradually down an incline or vertically.

The springs 13, 14 and 15 are held on the rocking arm 12 preferably by being forced into cross cuts in the latter and held with set pins if desired and are readily replaced in the event of breakage.

Claims r 1. A device for the purpose specified, comprising a frame, a movable member passing through the same, an operating lever projecting from said frame, a pawl pivoted to said operating lever, provided with a projection and engaging said movable member, an inclined face carried by said'casing and arranged above the pawl in a position to be engaged thereby, a second pawl located between the first pawl and said movable member and engaging the latter, a rocking arm arranged below said pawls, and springs projecting from said arm and adapted to press against either side of the lower portions of said pawls for holding said pawls in engagement with or out of engagement with said movable member.

2. A device for the purpose specified, comprising a-frame, a toothed rack operating in the latter, an operating lever projecting from. the frame, ,a pawl provided with a projection and pivotally mounted on said operating lever and engaging said rack, an inclined faceon said frame arranged above the pawl and located in a position to be engaged by the latter, a second pawl arranged between the first pawl and said rack and engaging the latter, a rocking arm arranged below said pawls, and springs projecting from said arm and adapted to press against either side of the lower portions of said pawls.

3. In a device of the kind specified, a load lifting and lowering member, pawls engageable with said member, a rocking arm, and springs projecting from said arm and adapted to press against either side of the lower portions of said pawls.

4:. A device of the kind defined by claim 1 in which the upper end of the first mentioned pawl is shaped to engage the load lifting member and in which the second pawl is provided with a tail, and a projection on the first pawl adapted to bear against the upper end of the second pawl.

5. A device of the kind defined by claim 1 in which the rocking arm carrying the springs is slotted, a short shaft passing through one side of the frame, an arm on the inner end of said shaft, a pin on said arm engaging in the slot of the rocking arm, and a manually operated reversing lever on the outer end of said shaft.

6. In a device of the kind defined by claim 1, an extension at the top of the frame, friction rollers mounted in the extension and engaged by the load lifting and lowering member, and a shackle secured to the frame.

7. A pushing and pulling device including a frame shaped at one end to permit the same to rest on a horizontal support and provided with means to enable the same to be attached to a hauling rope, a movable member extending through said frame and provided with means to permit the same to be engaged by pawls, an operating lever pivotally mounted in said frame and provided with a pivotally mounted pawl engageable with said movable member, a second pawl cooperating with the first pawl and engageable with said member and resilient means consisting of a rocking arm provided with leaf springs which are engageable with opposite si es of said pawls for forcing said pawls toward or away from said member.

In testimony whereof I affix my signature in the presence of two witnesses.

CHARLES EDMUND CLEWS.

Witnesses: v

WILLIAM PRIoHEs, DORIS ELLEN RArsAN.

It is hereby certified that Letters Patent No. 1,376,136, granted April 26, 1921, upon the application of Charles Edmund Clews, of Paeroa, New Zealand, for an improvement in Lifting-Jacks and Haulers, were erroneously issued to the inventor and Percy Nicol Kingswell as assignee of three-sixths interest in said invention, whereas said Kingswell should have appeared as owner of fioe-siaths interest in said invention, as shown by the record of assignments in this oflice;

and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Oifice.

Signed and sealed this 30th day of August, A. D., 1921.

' [SEAL] KARL FENNING,

Acting Commissioner of Patents.

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