US1345135A - Lifting-jack - Google Patents

Description

G. C. CONDITO.

LIFTING JACK.

APPLICATION FILED JAN. 14, 1919.

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LIFTING JACK.

APPLICATION FILED JAN.14| 1919.

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A TTORNEY Patented June 29, 1920;

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UNITED STATES,"

PATENT orrice. A

cnonen c. co1vnr'ro,'or WINGDALE, NEW YORK.

LIETING-JACK.

To all whom it may concern: a

Be it known that I, GEORGE C. CoNDrro, a citizen of the; United States, residing at Wingdale, in the county of Dutchess and Stateof New York have invented. new and useful Improvements in Lifting-Jacks, of which the following is a specification.

This invention relates to new and useful improvements in lifting jacks, and pertains more particularly to lifting jacks .of the screwtype which are adapted tobe-hand The primary object of the invention is to provide a hand operated lifting ack in which means is providedto operate the same in either direction to raise and .lowerthe lifting "element at the will of the operator.

A further object of the invention s tto provide means .for locking. the actuatlng mechanism in either of its operative positions. V v v c A further object of the invention is 'to provide a. device of this character which is both simpleand cheap in construction, and of easy operation lViththe above and other objects in view which will appear as the description of the case proceeds, reference is had to jthe accompanying drawings in which Figurel isa top planvlew ofaqack constructed in accordance with the present in vention, H. F ig. 2 is aside elevation thereof.

Fig. 8 is .a longitudinal 'SBCtlOIlitl view through the jack.

Fig. 4 isa detail View of 0a of the 11am};

elements. a

.Fig. 5 is a sectional view on the line 55 ofFig. 1'.

Flg. 61s a fragmentary v1ew actuating means.

Fig. 7 is a detail sectional view on the line Fig." 8 is. a detail view top plan' of the pawl engaging disk. I ,1 i I Fig. 9 is atransverse section through ,the pawl engaging disk. Fig. 10 isa detail View of. retaining inutfor thepawl engaging disk, Fig. 11 is a -detail viewing elevation of that portion of the jack shOW-n in Fig. 10, and

- Fig. 12 is a detail viewof the operating mechanism locking means Referring more P ticularly to the draw the slot 14 the partly in section of the spider member. and the pawlv the lifting element 20 is roughened'or ser- Vment 20 and the nut 23.

Specification of Letters Patent. P t t d J 29, 19 0 Application filed January 14, 1919. Serial No. 271,072.

provided with an enlarged base 11.

This pedestal member 10 is substantially hollow, and has its upper end reduced as at 12,.said reduced end being provided with an internal screw thread 13. The pedestal 1.0 is also provided with a cut out portion or slot 14, the purposeof which will be hereinafter described, and near its upper fendat a pointsubstantially diametrically opposite pedestal 10 is provided with ahandle 15.. V

.Having screw threaded engagement with the internal screw thread of the pedestal 10 and 1 movable longitudinally thereof is .a screw threaded standard 16, the thread of said standard being designated by the numeral 17. Thescrew thread 17 terminates at a point remote from the lower end of the standard 16 to provide a smooth bearing 1 18, is a lifting element 20- which projects through the slot 14,. and on its under face, and concentric with the jopening 21 in which the smooth bearin-gsurface 18 operates, this lifting element is provided with a! "ball race22, i

Threaded on the screwthreade'd end 19 of the standard 16 is a nut 23 which is shown in F igs 3, 10 and 11, and is provided on its upper face 24 withaconcentric ball-race 25. This nut 23 is also provided with a-transversely extending opening26 which isscrew threaded as at 27 for the reception of a transversely extending locking pin or-bolt 28 which serves to secure the nut 23against accidental displacement. The upper faceof rated as shown at 29, and on its under face it isprovided with an integral lugor the like 30. 'Mountedbetween the'lifting .ele-

ment 20 and the nut 23inthe ball races 22 r and 25 are balls 31 which serve to form an antirfriction joint between the lifting ele- Moui1ted on the upper end of the standard 33, and .mountedbetween the upper end of these two members, and said shoe 32 is re- ;16: is a shoe. or the like 32, the upper face of I which is roughened orserrated as shown at tained on the upper end of the standard 16 by means of the screw 35' Near 1ts upper end,'the screw threaded standard 16 is provided with an annular collar 36 above which the standard 16 is squared as at 37, and mounted on the collar of a plate 42 secured in place by bolts '43.

Mounted for rotation abont the standard 16 and resting on the upper face of the disk 39 is a spider or similar member -44 which is provided'with a plurality of perforations 45 so spacedas to be adapted for movement into'regi'ster with the perforations 41 in the disk 39, and mounted for vertical sliding movement within these perforations 45 are pawls 46 which are provided on their u' 'pe'r end with an off-set portion 47. The per orations'45 "are provided with extensions 48 for the reception of the off-set portion of said pawls. These pawls 46 are provided on their lower endswith inclined faces 49, and

I "said pawls are arranged in sets with the incllned facesof one set disposed in one direction, and those of the other set arranged in the opposite "direction.-

The spider member 44 is 'cut out as to form an annular channel 50am mounted, 'for rotation 1n said channel is a ring 51 which is provided throughout a portion of its periphery witha head 52 adapted to'be received'within an annular passage 53in the upper surface of the spider member.

The spider member 44'also is provided with a hollow extension 54 which is adapted to receive an operating handle 55 shown in dotted lines in Fig. '8. Pivotally mounted "on the top of said hollow extension is a lever '56, provided on one end with a handle 57.

The innerend of this lever 56 is adapted to engage in a recess in the ring 51 sothat when the lever is rocked the ring 51 is rotated in the annular channel of the spider me'mber44. This ring '51 is provided'on its under face with-cutout portions '59, one wall of which is provided with a; projection6O which is adapted to engage the under face 'ofthe head 47 of its respective pawl, the head of the pawl being receive'd'in said out out por ti0n59. 5 7

From the foregoing, it will be seen that if the spider member 44 is rockedabout the standard 16 in one direction, thatoneof the s'ets'of pawls willbe lifted outof' the openings 41in the disk 39in whichthey are en-' gaged, and if the lever is actuated in the opposite direction, the other set of pawls will be likewise operated;

Asyshown in Fig. 7, the set of pawls which are disengaged from the openings 41 are held up in their disengaged positionsby the shoulders 60 formed in the recesses 59, and theseseveral shoulders are moved into and out of engagement with their respective pawls by means of the ring member 51, which in turn is operated by the pivoted lever 56, which is held in either of its positions by means of asprin'g pressed pin 60, which is actuated by means of the coil spring 61. This pin-60 and spring 61'are mounted in a receded lng'62, and retained therein by means of the hollow screw '63. From the foregoing, it will be seen that the present invention provides novel means by which the screw threaded standard 16 may be rotatedin either direction to raise or lower either of the lifting elements 20 and 32. V r a 4 Having thus described the invention, what is claimed is: V a f p f 1. A lifting jack comprising a pedestah'a lifting screw threadedly connected with the pedestal, a disk fixed to the screw and provide'd with an annular series of apertures,"a spider member free to rotate on the screw above the disk and provided with sets of movable pawls adapted to co-act with the apertures in said disk to respectively revolve the screw in two directions, means adapted V to revolve upon the spider member, said means co-acting with the pawls and adapted to control their movements with respect to the apertures insaid disk, inechanismi for actuating said means, and a shoe carried by said screw.

- 2. A lifting jack comprising a pedestal, a

pedestal, a disk fixed to the screw and provided with an annular series or apertures, a spider member free to rotate on the screw above'the disk and provided with "sets" of movable pawls ada'pted'to co-act with the apertures in said disk to respectively revolve the screw in two directions, means adapted to revolve upon the "spider member, said means co-actingwith'thepawls and adapted to control theirmovements with respect to the apertures in-said disk, mechanism for 'actuati'ngsaid means, a shoe carried by1sa1d screw, and a locking device engageable with the actuating mechanism, as and for the purpose described. 7 V

'3. A lifting jackcompr'isin'g a pedestal, a screw threadedly connected with said'pedestal, a disk fixed to thesc'rew to rotate there-- I with and provided with annular series' of apertures, a spider free to revolve onthe screw "and disposed above the disk, sets .of. pawls movable vertically in the spider and i 10 5 lifting screw threadedly connected with the adapted to co-act with the apertures in said disk, movable means concentric of the screw for respectively actuating said sets of pawls With relation to the apertures in said disk, 5 an operatin handle carried by the spider, mechanism or actuating the movable means,

and locking device co-acting' with said mechanism to retain adjustments of the movable means.

In testimony whereof I have affixed my 10 signature.

7 GEORGE C. CONDITO.

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