US1409861A - Lifting jack - Google Patents

Description

H. B. IMES.

LIFTING JACK.

APPLICATION FILED IUNEZB. mo.

Patented Mar. 14, 1922.

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66% W J\ au-w SHEET 2.

Patented Mar. 14, 1922.

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1m! 1 or CHICAGO, mmois.

W8 JACK.

lpecijnltion of Letters Patent. Patented luar; 14, 1922? Application flail June" 28, 1920. Serial F0. 392,191.

To all whom it may concern:

Be it known that I, I'IARHY B. IMEs, a. citizen of the United States, cage, in the county of Cook and State of Illinois, have invented certain new anduseful Improvements in Lifting Jacks, ofwhich the following is a description.

My invention belongs to that general class of devices known as lifting jacks, and has for its object the production of such a device that will he etiectiveand reliable in its operation, and which will improve and increase advantages over devices of this'character heretofore available.

In the drawings, wherein like reference characters indicate like or corresponding parts,

Figure 1 is a side elevation of the preferred form of my device; v

Figure 2 is a top plan view of the same;

Figure 3 is a vertical sectional view on line 33 of Figure 2-;

Figure 4 is a vertical sectional view on line 44 of Figure 1, showing the jack ex tended to substantially ment.

Figure 5 is a top plan view of a rotatable sleeve supportedupon the standard;

Figure 6 is an edge view of the same showing a part of the cooperating threaded sleeve; and

Figure 7 is a cross sectional view suhstantially on line 7--7 of Figure 6.

In the drawings showing the preferred embodiment of my device, 1 represents a. supporting column provided with a suitable base 2 and formed with a cylindrical opening extending longitudinally therein as at 3.

A collar 4 formed to he loosely positioned within the cylindrical opening 3, carries upon its upper end a transversely extending heveled gear mernherlfi, which is adapted to rest upon the upper and ot' the base I in such manner as to he freely rotated thereon. As shown in Figure 4, hall hearing 3 or equivalent friction reducing rrwmhers may he interposed between tlumember ,3 and the upper end of the standard. 'ilu' ollar 4 1S internallv stretwthruadcd. as indi ated in Figures 4 and 0, for a purposiwhich will he hereafter described.

A bracket 7 is carried by the standard I, provided with a shaft 8 extending from the bracket to the hod v of the standard, ,upon which mounted the cooperating beveled residing at Uh i its limit of movegear 9 arranged to engage the gear 5. Any preferred means may the gear 9 to be readily rotated so as to rotate the gear 5 and its collar 4. As shown, the gear 9 has formed integrally therewith a cogwheel 10, forming a ratchet to cooperate with asuitable pawl carried hy an-opcrating lever. 11 is a pawl lever provided with an extension 12 loosely mounted on the shaft 8 and extended as at 13 to receive a suitable operatin r handle 14. 15 is a spring pawl longitudina ly movable in an extension 16 and maintaine in its operative position by a spring 17. The extension 16 in the simple form shown has formed in its'upper edge a transverseslot 18, in which may be positioned a transverse pin 1!) carried on the spring pawl. The paw-l has upon its upper enda head piece 20. By pulling the pawl outward, it will be freed from its engagement with the ratchet l0, and it may be rotated to bring its'rhisel point in the opposite direction, whereupon the reciprocation of the handle will cause the collar to rotate in the opposite direction. By this means the handle may he re'eiprocated to rotate the col lar 4 to secure the lifting effect, or when it -is desired to release the jack, by operating the pawl as descrihed, lowering the lifting hat and tending to release the jack.

In the preferred form illustrateth the lifting bar is telescopicallv formed, providing a plurality of members arranged to engage one another to secure that effect. 21 is a sleeve screw-threaded on its exterior as at 22 to engage the-interior threads on the collar 4.; and screw-threaded upon its interior as at 23 a suflir-ient distance to provide secure engagement with the screw-threads 24 upon the exterior of the cooperating supplemental lifting har 25, the threads and 24 extending in the same direction. The upper end of the supplemental ha! 25 is provided with an engaging plate 211, or its equivalent. arranged to contact with the hotly to he lifted.

lhe engaging plate 26 is removable from the har allowing the latter to he placed in threaded engagement with 'the sleeve 21 from the bottom of the latter, the har 25 being provided with an enlarged section 27 or with an equivalent arrangement so as to limit the upward movement of the bar and prevent its disengagement from the top of the sleeve '21. The lifting sleeve 21 is likebe employed to enable wise-engaged with the colla'r 5.- fronsi the bottom thereof. At the bottom it terminates in an extending shoulder 28, whichyasthe sleeve reaches its upward limit'ofi movement contacts with and engages ashoulder29 on the collar 4, thus stopping the rotation of the sleeve and preventing its accidental dis upon engagement. A collar 30 is secured the upper end of. the sleeve 21 in an mferred manner, and provided with '11 ex-' tending stop 31 which, as the sleeve reaches its lower limit of movement, engages with the stop 32 carried upon the upper face of the member 5, thus limiting rotation in that direction. A cap piece 33 isadapted to be placed over the upper end of the telescopingparts, and is provided with a central open-*3 mg through which those parts may extend.

The cap dpiece is secured to the base in any preferre manner, for illustration, by means of bolts 34.

, Assuming that the tool is inthe osition shown in Fig. 3, the reciprocation o the lever 14 will rotate the integral pivotal gearand collar to the right. caring in mind that the bar 25 is held HOD-POtatIVG by its engagement with the load to be lifted, or by other means, until it is placed against said load, it is obvious that the rotation of the' ar 5 will also rotate the sleeve 21, because t ere is nothing to hold said sleeve from such rotation, and further, the friction between the sleeve and ar at the coo crating threads, which is in iiced by the lgad, increases the tendency of the gear and' sleeve to rotatras-one.

Therefore, the gear and sleeve act togather as a nut, considering the bar 25 as the bolt. It is a well known mechanical law that when a bolt is held non-rotative and the nut is kept from sliding but is freely rotatable, then any rotation of the nut causes the bolt to move axially. In the same nian ner the rotation of the gear and sleeve as anut causes the bar 25 to be moved axially until the enlarged end 27 wedges against or abuts the lower thread 23, limiting the in dependent movement of the sleeve and bar. Tlie'n'the sleeveill changes in its action from a nut to a bolt and forms in effect 'an extension of the bar 25, because although the gear 5 still tends to rotate the sleeve 2l, such rotation would be in g, dlrection relatively downward of the lower end of the bar 25, and .as such movement is prevented by the enlargement 27, the sleeve can only move axially with the bar 25. Therefore, the continued rotation of the gear 5 in the same direction causes the sleeve and bar to lift as one, as said gear is held against axial movement by the rap 33 and acts as a nut. This will continue until the. sleeve reaches tlie limit of its movement and the extension 38 engages with the shoulder '29, locking the parts together and preventing any further I goo net oignovement of the lifting elements of the a v P' g the pawl outward and turning-it oi ie lialf rotation will bringit in the reverse engagement with the cog-rack or ratchet 10. The reciprocationv of the lever will then cause-thelreverse movement of the parts just described, and they will assume their original position.

35 is smiply'a'handle formed integrally with the standard for. convenience in handling the device,

Having thus described my invention, it is obvious that various immaterial modificatlgns may be made i the same without de- E gfrom' the spirit of my invention; eii ce;I'-' d,q%; not wish. to be, understood as limlt'riigj'myself to the exact form, construction, arran'geinent and combination of parts herein shown and described, or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. In a device of the kind described and in combination, a supporting bas'e formed with a vertically exten supplemental lifting bar, and a supplemental liftin bar externally threaded to engage said 5 eeve.

2. In a device of the kind described and in combination, a supportin base formed with a vertically extending cy Indrical opening in the center, an internally threaded collar to tatably supported upon the upper end of the base, means for rotating said collar, a cooperating sleeve externally threaded to engage with the thread in the collar and internally threaded to engage .a telescoping sup lemental lifting bar, and a supplemental ift- "ing bar. externally threaded to engage said sleeve, and means for reversing the rotation of the collar to restore the parts to their normal position.

3. In a device of the kind described and in combination, a su porting base formed with a vei'tically extending cylindrical opening in the center, an internally threaded collar rolatably supported upon the upper end of the base, an operating lever, a ratchet and pawl connection between the lever and the collar, means for reversing the: operation of the ratchet and pawl connec ion, a cooperating sleeve externally threaded to engage with the thread in the collar and internally threaded to engage a telescoping supplemental bar, and a supplemental lifting bar externally threaded to engage said sleeve.

4, In a device of the kind described and in combination, a supporting base formed with a vertically extending cylindrical opening in the center, an internally threaded collar rotatably supported upon the upper end of the 1 base and provided at its margin with a beveled gear, a cooperating beveled gear supported upon the device, arranged to engage with the gear on the collar, an operating lever arranged to engage the cooperating hercled gear, a cooperating sleeve externally threaded to engage with the thread in the collar and internally threaded to engage a telescoping sup lemental lifting bar, and a supplemental li ting bar externally threaded to engage said sleeve.

5. In a device of the kind described and in combinatiolnm supporting base formed with a vertically extending cylindrical opening in the center, an internally threaded collar rotatably supported upon the upper end of the base and provided at its eircpmfcrence with a beveled gear, a cooperating gear member supported upon the device and arranged to engage the beveled gear on the collar, said cooperating member provided with a ratchet i device, an operating lever provided with a ,springpmvl arranged to engage the ratchet to rotate the same in either direction at iii,

a cooperating sleeve externally threaded 1e engage with the thread in the collar and i ternally threaded to engage a telescopi! a supplemental lifting her externally threaded to engage with said sleeve.

In testimony whereof, I have herenr fi signed my name in the presence of two sub scribing witnesses.

HARRY B. IMES Witnesses:

JOHN W. HILL, BERTIIA HARTMANN.

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