US1796173A - Telescopic jack - Google Patents

Description

March 10, 1931' J. c..wARREN TELESCOPIC JACK Filed July 9, 1929 INVENTOR.

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Patented lVlar. 10, 1931 PATENT IOFFICE JOSEPH c, WARREmon OKLAHOMA CITY, OKLAHOMA TELESCOPIC JACK Application filed July 9, 1929. Serial No. 376,872.

'4 lMy linvention relates to improvements in telescopic jacks.

The principal objects ofmy invention are to provide a'deviceof this class which is new,

"Y novel, practical, useful and of evident utility;

which is strong, positive in action, durable and reliable which consists of but few sturdy parts, is easily operated, lcannot easily get outof order and is eflicient for the purposes for which it is intended; to provide a device which will not only operate on the principle of a vdouble screw or twin lift jack but will .operate twice as fast; a device which will I rfunction as a lifting or expanding jack and T5 Ialso asa pulling or retrieving tool; a device which will be of particular use in automobile repair shops and garages asa body jackv 'for straightening fenders, removing Adents in car bodies and 'rebuilding car chassis 59 ,which have been pi'n accidents;` to provide a telescopic jack consisting of a coupled outer sleeve, rotated by a handle removably inserted diametrically through 'its center and adapted `to operate thejack either expandingly or contractingly in very close lor cramped places where the ordinary jack can not be used; a Ajaclr'having an inner sleeve and jack screw at both ends of said outer sleeve, being threaded right hand at one end and left hand BU at thel other' and capable of expanding the` jack to severalv times its lclosed length; a jack with removable caps or heads, provided with a plurality of variously shaped attachments for special purposes to be used in place 35' of the ordinary caps; a telescopic jack having a handlewhich securely' locks the working parts in place but'which can beremoved and usedvfor `giving the outer sleeve a half turn at a time when working in close quarters;l

40 jack which can be ymade in various lengths and is capable of'be'ing expanded to several feet, thus eliminating the necessity of wood blocl s,1iro'n pipes and other makeshifts as now usedv with jacks having a few inches of lift when operating through a distance of several feet. i f e Y With these and other objects in view as will more fully appear, myinvention consists in the construction, novel features, and1com 59 bination of parts hereinafter more fullyfdescribed, pointed out in the claims hereto appended, and illustrated in the accompanying one sheet drawin of which,

Figure 1 is a bro en, longitudinal sectional view of my telescopic jack; Fig. 2 is a top or end view; Figs. 3, 4, 5, 7,8, 9, and 10 are views of various attachments which may be used in place of the caps or heads; and Fig. 6 is a fragmentary side view.

Like characters of reference designate like parts in all the figures.

It is understood that various changes in the form, proportion, size, shape, weight and other details of construction, within the scope of my invention may be resorted to without departing from the spirit or broad principle of my invention and without sacriiicing any of the advantages thereof, and it yis further understood that the Idrawimgs are to be interpreted as bein-g illustrative and not restrictive.

The preferred embodiment of my invention is shown as follows The enclosing or outer coupled rotary sleeve cons-ists of the parts 1 and2. Sleeve 1 encloses and contains '75 inner sleeve 3 which in yturn contains left hand threaded jack screw 5. In like manner sleeve 2 encloses inner sleeve 4 containing right hand threaded jack screw 6. Sleeves 1 and 2 are coupled by means of threads 7 80 forming an external joint at 8 and an internal joint at 9. -Outer sleeve 1 is provided with internal threads 10 at its outer end only, said threads 10 co-acting with corresponding ex,- ternal threads 12 oninner sleeve 3 through- 85 out its length. The said inner sleeve 3 is also provided with a. set of internal threads 14 at its outer end only, said threads 14 are adapted to co-act with the external threads on the jack screw 5, all of the threads on the said members 1, 3, and 5 being left hand. The unthreaded inner portions of sleeves 1 and 3 provide hollow cylinders for telescoping members 3 and 5 respectively. In like manner outer sleeve 2 has internal threads 11 at its outer end only, said threads 11 co-act ing with external threads 13 upon sleeve 4, saidsleeve 4 having internal threads 15 at its outer end only which co-act with the threads on jack screw 6, all of said threads 11, 13, 10G

and 15 being right hand. Inner sleeve 3 has a iiange 16 at its inner end and inner sleeve 4 has a flange 17 at its inner end, said flanges 16 and 17 forming stops for seating againstV threads and 11 respectively, when said inner sleeves 3 and 4 are in extended position.Y

Jack screw 5 is provided with a flange 18 and jack screw 6 with flange 19 which forni stops for seating against internal t-hreads 'A14 and respectively, when saidscrews 5 and 6 are in extended position. Said screws fand 6 have threaded ysockets and 21'respectivelyh` at their outer ends, said sockets being of sufhcient depth to securely anchor the various fittings to'be used with my telescopic jack'.

Right` hand disk 22 is screwed into outer sleeve 1 as a stop for vleft hand threaded members3 and 5 when in telescoped position andleft hand disk .23 vscrewed into louterl sleeve 2, functions inlike manner'forjri-ght hand threadedfmembers 4 and 6, said disks 22 and 23 .being provided with drill holes 24 and A25 respectively, for use withla bit wrench.V VJack screws 5 and 6 are respectively provided with knurled caps or heads 26 and 28- having threaded Shanks 27 and 29 inserted into sockets 2O and 21 when my device is to be used as an ordinary jack exerting anupward or outward force. Handle 30 jis inserted dia.- metrieally through hole 41 irl-sleeves Vl and A2 and` between disks 22 and 23. Hole 41 is drilled through sleeves 1 and 2 after said sleeves have been lscrewed to a tight t'at joints 8 and 9, and Vhandle', 30 is made to slid-i ably fit snugly into lsaid hole 41, thusk securely locking sleeves 1 and 2, and disks 22 and 23 inplacewhen my telescopic j ack has been assembled. Handle 30 is provided'with handle Vlocks or quicksnap-in features 31 to prevent said handle30 from being slipped out of hole 41 tooeasily. The handle 30 may be of any convenient length and may be used fin any suitable positionto obtain the proper leverage. yWhen'my device'is being used as a body.

jackvin Very close or inaccessible" quarters,

- the handle 30 may be given a half turn, withcidedly different manner from theordinary ratchet jack. The latter consist-sY of a` stationj arybase and body out of which a rack 'is Y vto raised by means of a handle operating a pawl. lThe force is exerted in only one direction, either upward oroutward, depending upon' kthe position in which the jack is placed, but

there -is no means of reversing this force and causingthe force to pull two bodies orrparts toward, one anotheixj When my telescopic jack is tofbe usedas van ordinary jack for lifting, it is placed iii-position with member on innerfsleeves 3 `and4 act to force-saidV sleeves 3and 4voutward, .without rotation,

from their telescoped positions in sleeves 1 and 2 until ia'nges 161and 17 freach and stop against threads 10- and 111. VWhen this point of outward movement is reached both sets of sleeves 1 and 2 together with 3 and 4 will rotate with handle 30V as one unit and internal threads 14 andv 15 will operate with jack screws 5 and 6 in further outward movement luntil lian'ges l8'and19 upon said screws 5 and G'Vseat against threads-lltland 15 when the limit of outward travel khas been reached. The length or distance through which my telescopic jack will act can be controlled by yproperly regulating the dimensions of the inovingparts anditcan benmade approximately three .times` as 'long when extended as when teleseopedf. Attention isY called Vto the fact that instead of acting upward or outwardfrom one point orbase as would a double screw jack myL device constitutes what might be called a twin double screw jackY as it acts outwardrin two opposite'directions from the handle 30 and the action is'obviouslyv at twice the speed ofthe ordinary double screw jack. ,a When used as `an automobile body jack Ait can be'made in such length as to extend several feetand entirelyeliminatethe use yoi wood blocks and ironlpipes as extensions as isthepractice ,with 'jacksnow in use. This use'lofgloose blocksV and pipe is a Ysource of danger to workmenlfor when theforce is applied at a-slightangle, the blocks kick out7 and cause more or less injury as well. as annoyance and loss of time. This cannot happen with myftelescopic jackregardless of the length towhich it is extended as all' the parts are rigidly connected. f 'l 'j Itl'ispfrequently desirable to pull parts together instead of forcing them apart as with a common jackf. My improved device is especially designed with this idea. in mind and .for this purpose I have illustratedin Figs.

3,5, 7 and`9 some of the attachments suitable for this purpose. Each lattachment is provided with a cap or cover plate Y 32 and a threaded shank 33, the said shanks. 33 being ,adapted to be screwedintov sockets20 and 21.

, The ring or eye 34,'the hook 36, the'chain and hook 37 and the Vc'lanip`40` provide means for attaching my jack to various parts' and inV different places'when the `jack'is extended.

By using the handle 30 inthe reverse directionv to that justdescribed, the jack will exert a pull and drawsaidrp'arts` together; In

Figs. -`4, 8- and 10 I illustrate other attachments to` be used inffplaces wherethe caps 26 and 28 would not litor-where they-might slip and cause damage. Each of the attachments in Figs. 4, 8 yand. 10 hasa cover plate and shank. 33 for use as just explained. If vmy device is usedas a body jack, Uffork 35 may be used to slip over a hub, rod or axle, angular head 38 into a square corner and crescent or segment head 39 for removing a bodv dent. It is to be understood that other attachments may be devised for special purposes and that I do not confine myself to those here illustrated,

From the foregoing description it can be readily understood that I have provided a compact, double and quick acting telescopic jack which will serve to exert outward force as an ordinary jack and in addition can be used to exert an inward force or pull not possible with a common jack.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is l. A device vof the class described, comprising coupled rotatable outer sleeves, right and left hand disks internally threaded into the inner ends of the said outer sleeves adjacent the inner joint formed by the coupling of the said outer sleeves, and a handle passing diametrically through the coupled ends of the said outer sleeves and between the said internal disks, the said handle being adapted to rotate said sleeves and lock said disks and said sleeves in position when the device'is assembled.

2. In a telescopic jack, the combination of rotatable, coupled outer sleeves; externally threaded disks adjacent the inner ends of the said outer sleeves; a handle rotatable and locking means for rotating said disks and said outer sleeves; the outer sleeves each havlng a set of oppositely inclined internal 'threads at their outer ends only; inner sleeves externally threaded in opposite directions for co-acting with the said internal threads of the said outer sleeves; flange stop means on the inner ends of the said inner sleeves for seating against the internal threads on the said outer sleeves and limiting the outward movement of the said inner sleeves; the inner sleeves each having a set ofY oppositely inclined internal threads at their outer ends only; oppositely threaded jack screws positioned within the said inner sleeves for co-acting with the said internal threads at the outer ends of the said inner sleeves; stop means on the inner ends of the said jack screws for limiting the outward movement of the said jack screws; said jack screws having threaded sockets in their outer ends; and caps having threaded shanks to engage in the said sockets for attaching the said jack screws thereto.

3. In a telescopic jack, coupled rotatable outer sleeves, right and left hand disks internally threaded 'into the said outer sleeves adjacent their inner ends, a handle passing i diametrically through the said outer sleeves and between said disks for rotating said having right and left hand internal threads adjacent 'their outer ends only, the inner sleeves havingI right hand and left hand external threads substantially throughouttheir entire length, saidl external threads being adapted to co-act with said internal threads on said outer sleeves in extending and retrieving said innersleeves, and flanges at the inner ends of the said inner sleeves adapted to form stops against the said internal threads of the saidouter sleeves and limit the outward movement of the said inner sleeves.

4. In a telescopic jack, coupled rotatable outer sleeves, right and left hand disks'internally threaded into the said outer sleeves adjacent their inner ends, a handle passing diametrically through said outer sleeves and between said disks for rotating said outer sleeves and locking said internal disks and said outer sleeves in assembling said jack, the outer sleeves having right and left hand internal threads adjacent their outer ends only, the inner sleeves having right and left hand external threads substantially throughout their entire length, said external threads being adapted to co-act with said internal threads on the said outer sleeves in extending and retrieving said inner sleeves, flanges at the inner ends of the said inner sleeves adapted to form stops against the said internal threads of the said outer sleeves and limit the outward movement of the said inner sleeves, the inner sleeves having right and left hand internal threads adjacent their outer ends only, right and left hand externally threaded jack screws adapted to co-act with the internal threads adjacent the outer ends of the said inner sleeves, and fianges at the inner ends of the said jack screws for forming stops against the said internal threads in the outer ends of the said inner sleeves and limit the outward movement of the said jack screws.

5. In a telescopic jack, the combination of rotatable coupled outer sleeves; externally threaded disks adjacent the inner ends of the said outer sleeves a handle rotating and locking means for said disks and said outer sleeves; the outer sleeves each having a set of oppositely inclined internal threads at their outer ends only; inner sleeves externally threaded in opposite directions for co-acting with the said internal threads of the said outer sleeves; flange stop means on the inner ends of the said inner sleeves for seating against the internal threads on the said outer sleeves and limiting the outward movement of the said inner sleeves; the inner sleeves each having a set of oppositely inclined internal threads at their outer ends only; oppositely threaded jack screws positioned within the said inner sleeves for co-acting with the said internal threads at the outer ends of the said m f In testimon innerS sleeves stop, means on theI inner ends offthsadfjack screws for limiting the outward movementcrf the-said; jack screws.; the Y said-jack Screws having tlfiremelSocketsA in ,their outer fands; .and caps ,or heads with knnrled surfaces and threaded', Shanks for positoningin thelsaid sockets and receiving and transmitt Sayid jack ngyvthe outward force lof the y wheifof I affix my signature.

f1 QSEPH YC. WARREN.

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