US1549795A - Lifting jack - Google Patents

Description

' Aug. 1s, 1925.

` l 1,549,795 W. G. PANCOAST LIFTING JACK `Filed July 23, 1923 lll invention to overcome the disadvantagesl Patentedy Aug. i8, i925..

UNITED STATES WILLIAM G. IPANCQAST, GF TNILMETTE, ILLINOIS.

LIFTING JACK.

Application led July 23, 1923. Serial No. 653,078.

To all Lo/wm t may conc-era:

Be it known that l, WILLIAM G. PAN- coas'r, a citizen of the United States, and a resident of lililmette, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Lifting Jacks, of which' the following is a specification.

This invention relates to improvements in lifting jacks, and more particularly to portable devices commonly used in connection with automobiles for making repairs, and especially for lifting the wheels from the Aaround in order to replace or change tires Referring particularly to that type of jack extensively used for'automobile repair work, the same is designed to be placed on the ground directly beneath the axle, spring, or other substantial portion of the frame, and then operated to bring the upper end into engagement with the vehicle. The operation of acks in this manner is attended with some degree of danger, since there is the possibility of an insecure supporting contact between the vehicle and the jack and the liability of injury to persons, should the j ack slip and the vehicle suddenly be lowered to the ground. Furthermore, in placing1 the jack in proper lifting position it is frequently diiiicult to do so properly without virtually crawling beneath the vehicle, particularly at the rear end thereof, where spare tires, bumpers, and other accessories extend some distance beyond the body.

It is therefore the object of the present and eliminate the dangers hereinbefore enumerated, as well as to provide a new and useful lifting device embodying` other features calculated to provide a more eiiicient and practical tool.

In the accompanying drawing a preferred construction for the improved jack is illustrated, wherein Figure `l is a view partially in end elevation and partially in vertical section of the device,

Figure 2 is a view in vertical on line 2, 2 of Figure l,

Figure 3 is a cross-sectional view taken on line 3, 3 of Figure l, and

Figure l vis a cross-sectional view taken on line 4, 4; of Figure 2.

The preferred form of jack disclosed comprises two main elements common to devices section taken of this character, namely, an upright stand-A ard or pedestal designed to rest upon the `ground, and having a base or foot plate, and a vertically extensible shank. Various methods have been adopted for operating the jack by extending or retracting the movable shank, the common forms being the ratchet type and the screw type, the former involving the pumping action of a lever to lift the vehicle, and the latter the rotation of a rod or shaft. Although either, or any suitable type of lifting mechanism may be employed. l prefer to disclose the so-called screw-jack type, since it permits the use of a long operating handle which maybe manipulated at a distance from the point of application of the jack itself.

Following the general combination of parts before included in such a device, the

pedestal l comprises two main parts, namely, an internal and relatively stationary post 2, and an external rotative sleeve 3. The post' 2 has formed integral with its lower end a base or foot plate l designed to afford aA substantial footing or support for the device. As clearly shown in Figure 2, the post 2 extends upwardly from the center of its base plate Li, and is split or bifurcated from its top to bottom, thus forming two parts or halves with a slot or opening there- 55 between, in which is mounted for vertical sliding movement, the extensible shank 5. is clearly shown in Figure fi, the shank 5 resembles somewhat an I-beam section, being slightly reduced in width throughout its central portion, thus providing interiitting guideways (as at 6) between the moving parts. rlhe sleeve 3 surrounds the post 2, the outer faces of the latter being curvilinear to conform to the internal circumference of the sleeve. This sleeve is rotative and is supported at its lower end upon a roller step bearing 7 sunk in an annular raceway 8 formed in the upper face ofthe base plate a at the lower end of the post 2. A flange or radial enlargement 3a is formed at the lower end ofthe sleeve which partially rides in the raceway 8, thus centering the sleeve in its rotative movement. l

The internal surface of the sleeve -is tapped from end to end with squarehelical screw threads of comparatively large pitch which mesh with a threaded portion 5a at the lower end of the shank 5, the threads being of the same formation and pitch as those of the sleeve 3. As clearly shown in Figure 1i, the threads of .the ,shank 5 are formed along the opposite sides thereof, and project into engagement with the complementary threads oit the sleeve.

The upper end of the sleeve 3 terminates below the end of the post 2, which it surrounds, thereby allowing tor the mounting` ot a cap member 9 in screw threaded connection with said post. rhe cap member is provided with a marginal flange fitting over the upper edge ofthe sleeve and providing an end bearing there'tor. Formed integral with the cap member is a housing 10, arranged tangentially with respect to its periphery, said housing forming a bearing and enclosure tor a worin 11 and worin sha'tt 12 extending from said housing. Cut in the upper edge ot' the sleeve 3 and extending` around the same are segments ot worin teeth 13 which mesh with the worm 11. The worm shait 12 terminates in a squared end 12zl adapted to take the socketed end ot a removable shaft (not shown) which is attached when the jack is to be operated.

Obviously by rotating the worm shaft 12 the sleeve 3 is rotated through the toothed engagement of the worm 11 with the teeth 13, and that the rotation ot the sleeve imparts a vertical movement to the shank through the threaded connection therebetween, thus causing the latter to be extended upwardly t or downwardly it the post is to be retracted) from the end of the relatively stationary pedestal 1, a distance substantially equal to the length ot the unthreaded portion ot said shank. This is all a matter of practical mechanics and therefore needs no extensive explanation.

The shank 5, it will be observed`r extends from the upper cnd of the pedestal and by the cap member 9 when in '.tully lowered or retracted position. This extended end port-ion serves as a support or connection lor that part of the device having intimate contact or connection with the vehicle. These parts will now be described. Mounted directly upon the end portion et the column 5 is a collar 15 open at its lower end and provided in its upper end with a rectangular opening 15a. The connection is made between the,l collar and the end of the shank 5, by means of bolts 16, 16. The portion ot the collar immediately above the bolts .is ot increased thickness and torms a cavity 1'? of reduced diameter as well as an internal downwardly facing shoulder which bears upon the upper end ot the shank at diametrically opposed points, as at 13, 18.

Mounted in the collai1 and connected therewith is the vehicle engaging member 19 of the jack having the form of a hook with a lateral or side opening, and resembling` the letter C. .fit the base ot the hook member 19 is an integral stud 20, for the most part cylindric in form, but having just beneath a shallow boss 21 on the under side ot the hook member, a squared portion 22 forming a key, which is adapted to lit within the rectangular opening 15" in the collar 15. Surrounding the stud below the key 22 is a coiled spring 23 held in place by a. washer 24- secured by a screw 25 to the end ot the stud.

The hook member proper 19 is designed and dimensioned so as to accommodate the spring or axle ot' the automobile and to sustain the load to be supported thereby. is clearly shown in Figure 2, the hool: menzber is tapered from top to bottom, providing the more rugged construction throughout the lower portions, as well as a wider bearing surface along the lower horizontal branch. Moreover, the inner portions oit the several branches ot the hook member are beveled, approaching a v' -section throughout the vertical and upper horizontal branches. rlhe extremity ot the upper branch is turned downwardly at 26 in a rounded end and at the extren'iit)v ot the lower branch a lug 2.7 is formed, thereby restricting the opening slightly, but affording' a stop to prevent the part engaged within the hook 'trom slipping or sliding outwardly through the opening.

lt is further desi 'able to provide roller journalled in a recess formed in the under side ot the upper horizonta ln'aneh ot the hooi-. mer-"ber as clearlj.' shown in This may be a roller o'ii relativelj.' small diameter and extended suhstanti: lly the or several .ength of the bearing` surface,

shorter rollers. The purpose et' such a roller is to facilitate the movement ot the jack along.' the spring o" axle in placing in the ultiuu; i g' position and to permit it to ride over obstructions, such rivet heads and the like, that may project troni the top e thereof.

j already suggesties, the weight et the le is supported upon the lower horizon- "h ot the hook member in the actual 'tii although the entire meinter is uti. liried in tlrx application ot the pick. as wlll non' be described. .issunung that one olI the rear wheels oi the vehicle is to be raised 'troni the ound, the jack in its retra-fted position is applied to the axle or the spring' by hoolfthe hook member over the selected part and allowing the remaining part to swing down into vertical position. bviously. it is not necessary' that the base ot the jack be lirst placed in proper position tor litting. since the hooked engagement holds the liack suspended until it is sui'llcientlf.r extended to ln'ing the vtoot ot' the same into contact with the ground, whereupon the I'ontiiwed extension ol" the jack seats it iirnily in place and the weight ln'ou'ht upon the lower branch et' the hook member.

ior is it always necessary to apply the jack at the exactl position where the lifting power is to be applied. For instance, the hooked end may loo be hooked over the loWer part of the spring near its outer end assuming the springs are either full or three-quarters elliptical) and the jack will slide, or is easilyv guided, along; the spring' to the desired position beneath the vehicle and near the axle. t is for this purpose thatthei-oller 23 is utilized. In this manner the placing of the jack is accomplished Without the inconvenience of crawlingr beneath the vehicle.

"lhis method of applying' a jack is quite the reverse of that practiced With the ordinary device inasmuch as the jack is extended from the vehicle dovtn to the groi'ziid in stead of from the ground up to the vehicle.

ll/lanifestly the method of applying the jack depends on the construction of the vehicle, the point selected for its application, and the part ofthe vehicle to be raised. For this reason the hooked end 19 is adjustable about the vertical axis so that the opening of the hooked .member may be faced in the desired direction with respect to the meniber to be engaged and the direction which the Worm shaft. l2 will extend for the purpose of applying the operating' shaft. ily the sivivel connection between the hook member 19 andthe collar it is thus possible to pull the hook memberI axially With respect to the remaining` parts of the jack, thus releasing' the key 22 from its square seat 15a. rthis allows the hook member to be turned into any one of four positions ninety degrees apart, and then allowing the spring` to draw the same back into normal position With the key in locking'position.

ik further feature of construction is the provision of a joint or hinge at the june tion of the loiver and vertical branches of the Cfshaped member 19. As a preferable method of forming the hinge, the closed end of the loiver branch is provided With a forked or slotted portion 30 adapted to receive a centrally disposed lug 31, integral with the hinged portion. This lug' conforms to the shape of the slot 30, which is extended ,laterally to provide an offset to take a hinge pin 32. The hinged parts are designed to have bearingr Contact along shoulders at 33, as Well as along diagonal faces 34 at the lower edge of the lug 3l and at the bottom of the slotted portion 30. Spaced inwardly from the hinge pin 32 and on a line with theloiver edge ofthe lua" 31., are provided registeringholes adapted to receive a removable lockingpin 35 for securing the hinged parts together in normal position. A chain 36 connects the pin 35 with a fixed pin 37 anchored in the lower branch of the hook member to secure the locking pin against loss. Thus, by removing; the pin 35 the upper portion of the hook member can be swung down and to one side as shown in dotted lines in Figure l, allowing' the jack to be used in the ordinary Way,

nerstood that do not Wish to be limited to the specific construction herein shown and' described except in so far as set forth in the appended claims:

l, claim:

l. A lifting jack comprising a relatively stationary pedestal, an extensible shank having;- a laterally opening hooked shaped end portion capable of rotative adjustment about the axis of said shank and means for locking said end portion in one of several rotatable adjustment.

2. A lifting device comprising,y a relatively stationary pedestal, an extensible shank mounted on said pedestal, a hook shaped end portion having swivel connection with said shank, said shank and hooked portions being provided with interlocking` members, and yielda-ble means acting to hold said members in locking` engagement.

3. A lifting device comprising` a pedestal, an extensible shank, means for manually extending and retracting said shank, a C- shaped portion mounted at the end of said shank through the medium of a stud and socket connection arranged to permit the sivivelling of said portion, said stud having a key adapted to normally engage a complementary seatin said recess, and to be withdrawn therefrom to permit the adjustment of said portion, and yieldable means acting to resist the Withdrawal of said key from its seat.

el. A lifting` device comprising a pedestal, an extensible shank, means for manually extending and retracting said shank, a C- shaped portion mounted at the end of said shank and provided with a stud adapted to engage a socket in the end of said shank, said stud and socket having` an interlocking key and seat, and a yieldable member acting to resist the withdrawal of said squared por tion from its seat.

5. A lifting device comprising` a pedestal, an extensible shank, means for manually extending and retracting said shank, a C- shaped portion mounted at the end of said shank, said portion having` an axially disposed stud extending into a socket in the end of said shank, and a spring' Within said socket acting` to resist the Withdrawal of said stud, said stud and recess being provided with an interiitting key` and seat normally acting' to lock said portion from rot-ation upon said shank.

6. A lifting device comprising a pedestal, an extensible Shank operatively connected positions with said pedestal, actuating mechanism for extending said shank axially of said pedestal and a laterally opening hook shaped member' mounted at the end of said shank and capable of limited axial displacement relative to said shank, said member in one position of displacement being rotative into aplurality of positions of adjustment and in another position to be locked to said shank and against rotation.

7. A lifting device comprising a pedestal. consisting of a post provided with a foot plate, a rotative sleeve surrounding said post, a shank extending axially of said post and having screw threaded connection with said sleeve, a worm and worm shaft mounted at the upper end of said pedestal and engaging teeth on said sleeve, and a hook-shaped object-engaging member mounted in swivel connection at the end of said shank.

8. A lifting device comprising a pedestal consist-ing of a post provided with a foot plate, a rotative sleeve surrounding said post, a shank extending axially of said post and having screw threaded connection with said sleeve, a worin and worm shaft mounted at the upper end of said pedestal and engaging teeth on said sleeve, and a C-shaped member mounted at the end of said shank and having swivel connection therewith, and coacting locking members for normally locking said member to said shank and against relative rotative movement.

9. A lifting device comprising a pedestal consisting of a post provided with a foot plate, a rotative sleeve surrounding said post, a shank extending axially of said post and having screw threaded connection with said sleeve, a worm and worm shaft mounted at the upper end of said pedestal and engaging teeth formed in said sleeve, a cap member mounted at the end of said shank and having a socket formed therein, a C- shaped object-engaging member mounted at the end of said shank and having an axially disposed stud extending int-o said socket, and means permit-ting said C-shaped member to be displaced axially and rotated, and means for locking said member in predetermined 1riositions of rotation.

10. A lifting device comprising a pedestal and an extensible shank having a hooked end portion consisting` of two hinged together parts, whereby the upper portion of said end portion may be swung into inoperative position.

1l. A lifting device comprising a pedestal, an extensible shank, a C-shaped member at the end of said shank having a hinge at the junction of the lower and vertical branches thereof, whereby the upper portion may be swung into inoperative position, and means for locking the hinged part in operative position.

l2. A lifting device comprising a lower branch forming a horizontal supporting surface and vertical and upper branch portion hinged to one end of said lower branch, and a locking` pin, for normally securing said parts in C-shape and permitting the upper portion thereof to be swung out of operative position.

In witness whereof, I hereunto subscribe my name this 19th day of July, A. D., 1928.

WM. G. PANCOAST.

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