US1350663A - Quick-action jack - Google Patents

Description

A. W. MARR.

QUICK ACTION JACK.

APPLICATION FILED. A116. 19. 1919.

1,350,663, Patented Aug. 24,1920.

2 SHEETS-SHEET l- 2 W I H Fig! Fig. 2

June/atom Gamma,

A. W. MARR.

QUICK ACTION JACK.

APPLICATION FILED AUG-1,9, m9.

1 3 50,- 66 3 Patented Aug. 24, 1920.

' 2 SHEETS-SHEET 2- witness- ALEXANDER W. MARR, OF CANTON, OHIO.

QUICK-ACTION JACK.

Application filed August 19, 1919.

To all whom it may concern Be it known that 1, ALEXANDER W. MARK, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented certain new and useful Improvements in Quick-Action Jacks, of which the following is a specification.

This invention relates to new and useful improvements in quick-action jacks.

One of the principal objects of the invention is to provide for automobile use, a jack that may be readily and conveniently positioned under the car and almost instantaneously raised to the load without the necessity of bending or stooping under the machine. By means of an operating rod adapted to receive a crank on one end, the jack may be projected under an axle, and the screw sprung up to it by simply manipu lating a cam.

Another object of the invention is to produce a jack that may be made out of sheet steel by punch press operations, thereby reducing its cost of construction to the minimum.

Other important and incidental objects will be brought out in the following specification, and particularly set forth in the subjoined claims.

The preferred form of embodiment of my invention is illustrated in the accompanying drawings, of which Figure 1 is a side elevational view, partly in section, of my improved ack. Fig. 2 1s a side elevatlonal view of the operatmg means-for the ack.

'Fig. 3 is a sectional view on the line aa of Fig. 1, showing the cam operating means and the nuts adapted to be forced thereby into engagement with the screw. Fig. 4 is a top plan view of the cam and nut housing. Fig. 5 is an end elevational viewof one of the screw engaging nuts or lugs. Fig. 6

' is a side elevational view of the same. And

Fig. 7 is a top plan view of the support for the cam and nut housing, showing the guiding means for the nuts.

Throughout the specification and drawings similar reference characters denote corresponding parts.

Referring to the accompanying drawings, the numeral 1 designates the base and 2 the receiving socket. mounted thereon, for a tubular standard 3. In one side this standard contains a vertical slot 4 that acts as a guide for horizontal screw 5 carried by the vertical jack screw '6 that'has the Specification of Letters Patent.

Patented A11 Serial No. 318,541.

usual up and down movement in said standard. On top of the screw 6 is mounted the usual load receiving head 7.

In its lower end the jack screw 6 contains a hole 8 of larger diameter than a hole 9 above, and with which it communicates, the upper hole extending well up into the screw. In the lower hole 8 there is placed a coil spring 10 that surrounds a guide rod 11 that projects into the upper hole 8, and is of such a length as to permit the screw to be forcedto its lowermost position within the standard and to guide it during its up and down movement within the latter. The spring 10 presses against the shoulder formed at the meeting point of the upper and lower holes in the screw 6, quiclrl to force the screw up to the load when said screw is released by the mechanism hereinafter to be described.

Suitably secured to the upper .end of the tubular standard 3 is a sleeve 12 that terminates at its upper end in an outwardly flaring ball race member 13 containing in an annular channel near its outer end a series of balls 14. Resting upon the balls 14 is a beveled ratchet gear 15 preferably constructed in four laminations in order that it may be made by the punch press.

The ratchet gear 15 is provided at its middle peripheral portion with annular grooves 16 into which project retaining keys 17 fitted in the standard 3. The function of these grooves and keys is to prevent the balls from falling out when the jack is turned up side down, and to hold the ratchet gear firmly on said bearings at all times without interfering with its free turning movement.

Firmly secured to one side of the upper end of the standard 3 is a bracket bearing 18 for a horizontal shaft 19 having a reduced inner end that is loosely received by a hole in the sleeve 12. Beyond the bracket bear ing 18 the shaft 19 has an enlarged cylindrical collar portion 20 for a purpose to be hereinafter described. At its outer end the shaft 19 terminates in a ball 21 containing a transverse hole that tightly receives a short crank 22. On the inner end of the shaft 19 there is fast a bevel gear 23 which meshes with the beveled ratchet gear 15.. Like the latter, the gear 23 is preferably COllSlIlllCtQkl of four laminations so that it may be made by the punch press.

For the purpose of raising and lowering the screw 6.

the screw 6 when the crank 22 is turned, and to permit said screw to be instantaneously sprung to the load independent of the gearing described, the following mechanism is provided.

Referring to Fig. 7 there are preferably mounted on the fi a top of the laminated gear 15, three lugs 24 circumferentially disposed thereon near the outer marginal edge thereof. Each of these lugs contains a transverse screw-threaded hole adapted to be brought into registry with a similar crewthreaded hole provided in the peripheral wall of an inverted-cup shaped housing 25 that rests on the top of the gear 15, with the lugs 2a on the inside. When the threaded holes in the lugs 24; have been brought into registry with the threaded holes in the peripheral wall of the housing 25, screws 26 are inserted in said holes firmly to secure said housing on the gear 15. (See Figs. 1 and 7.)

Also mounted on the flat top of the gear 15, are three radial guiding pieces 27, although a greater or a less number may be provided if desired. Each one of these guiding pieces 27 is adapted to fit loosely into a groove 28 in the bottom of a bracketthreaded member 29 hereinafter to be referred to as nut Referring to Figs. 5 and 6, each of these nuts 29 comprises an elongated steel block having a convex back portion whose periphery conforms to that of the peripheral wall of the housing 25, while its inner face is concaved and bracket-- threaded to engage the bracket threads on At its middle back portion, each nut 29 contains a recess 30 that extends well into it, and through which a screw pin 31 loosely passes from a vertical hole in the topportion of the nut into a threaded hole in the nut below the recess 30 therein, for a purpose soon to be described.

Each of the nuts 29 has a movement into and out of engagement with the jack screw 6, along the top surface of the gear 15, being guided in such movement by a respective radial piece 27 that fits in the groove 23 in the bottom of the nut. These nuts are moved into engagement with the screw 6 by the following mechanism.

Referring to Fig. 3, there is contained within the housing 25 an annular cam 32 that is adapted to project into the recesses 30 in the nuts 29, The curvature of the outer rim of the cam 32 conforms to that of the wall of the housing, whereby it may be turned freely therein. The inside marginal edge of the cam has the contour shown in Fig. 3, being formed to provide three hookshaped portions 33 and a like number ofv neutral recessed portions 3 f, each of the latter being approximately midway between two hook-shaped portions. From each hookshaped portion 33 to the first recessed portion 34 to the left, the cam increases in width, to provide an inwardly converging cam surface that is adapted to engage the pin 31 in each nut 29 and cam the later into engagement with the jack screw 6. These nuts are guided toward the screw 6 by the guiding pieces 27 on the top of the gear 15, and by the screws 31 that loosely project into elongated radial slots 36 in'the top of the housing 25. The nuts are thus firmly braced in their vertical position at the top and at the bottom, and when cammed into engagement with the screw 6, they will be firmly held in engagement therewith by the neutral part of the cam with a margin of safety. Pressure is at all times exerted on the center of the nut, by the cam which in turn bears against the wall of the housing in a radial direction when said nut is in engagement with the screw. tightly gripped by the nuts, there is no danger of it slipping when lifting a great load.

The cam 32 is turned within the housing 25 by a finger piece 37 whose reduced inner end projects through a circumferential slot in the wall of the housing to the underside of the cam, to which it is firmly secured by a screw 38. (See Figs. 1 and 3.)

When it is desired to spring the screw 6 instantaneously to the load, the cam 32 is turned counter clockwise by the finger piece 37. When the cam starts to move, the pressure of the spring 10 is sufficient to snap the screw 6 upwardly, the angle of the bracket threads on the latter forcing the nuts 29 rearwardly out of the way. The nuts are permitted this rearward movement by the now outwardly converging cam surfaces between the neutral and hook-shaped portions of the cam as the latter is moved counter clockwise. The nuts 29 may be firmly held in their out-of-the-way position by moving the cam 32 far enough to the left to permit the hook-shaped portions 33 thereof to firmly grip the pins 31 in the nuts as shown by the heavy lines in Fig. 3 the dotted lines showing the nuts engaged with the screw.

Now, when it is desired to move the nuts 29 into engagement with the jack screw, whereby the latter may be raised when the crank 22 is turned, the cam 32 is moved to the right. The cam surfaces to the left of thehook-shaped portions 33 will now bear against the pins 31 in the nuts 29, to move the latter inwardly into engagement with the threads of the jack screw 6 until the said pins are in their neutral positions on the cam surface. The cam now bears directly on the central portions of the nuts so that they cannot come out of mesh with the screw when the pressure is on the latter. By turning the crank 22, the screw may now be raised, since the nuts are carried around by the-gear 15 and. the screw 6is restrained The latter being thus portions of the crank 22 from a circular movement by the screw bearing against the walls of the slot 4 in the standard 3. Accordingly, when the nuts 29 are rotated about the screw 6, the latter will be raised until it has reached its extreme upper position or the load has been elevated to a desired height below that position. By turning the crank 22 in the opposite direction, the load may be lowered to the point where the screw is relieved of its weight, whereupon the cam may be turned to the left to permit the screw to be quickly pressed to its normal position within the standard, after which the nuts may be pressed into engagement with said screw to hold it there until the jack is again used.

For the purpose of placing the jack under an automobile without stooping under the latter, the following device is, provided. Referring to Figs. 1 and 2, the numeral 39 designates an elongated operated rod on one end of which is an enlarged cylindrical socket portion 40 having two oppositely disposed recesses 41 adapted to receive those on each side of the ball 21. The ball 21 being loosely received within the socket 40, and the crank within the recesses 41 therein,the shaft 19 may be turned at a distance from the jack by r0- tating the rod 39. from any angle, by an suitable crank 42 applied to its outer encli A ball and socket joint connection is thus formed between the inner end of rod 39 and the outer end of the shaft 19 to permit the latter to be turned to raise the jack, by one assuming a standing position near the car.

It is not necessary for a person to insert the jack under an axle by gripping the standard with the hand, since the socket 40,

by being thrust over the cylindrical collar portion of the shaft 19 as shown in Fig. 1, will permit the jack to be projected under the load by the rod 39. After it has been placed in such a position, the socket is pulled outwardly a sufficient distanceto clear the collar 20, whereby a ball and socket oint is formed that permits the shaft 19 to be turned while the operator remains in a standing position.

On its outer end the rod 39 is provided with a transverse pin 43 which is adapted to enter a hole 44 in the finger piece 37, whereby the latter may be moved to release the quick-action mechanism by one assuming a standing position near the car. The pin 43 also forms a driving connection between the outer end of the rod 39 and the crank 42, whereby when the latter is turned, the rod will be rotated to turn the crank 22 and through it raise or lower the screw. The dotted lines in Fig. 1 show the pin 43 within the hole 44 in the finger piece 37.

Having described my invention, I claim: 1. In a device of the type described, the combination with a tubular. standard, of a swiftly to elevate said screw when the threaded means are out of engagement therewith.

2. In a device of the type described, the

combination with a tubular standard, of a screw vertically movable therein, threaded members horizontally movable into and out of engagement with said screw for the purpose specified, and resilient means within the standard swiftly to elevate said screw when the threaded members are out of engagement therewith.

2,. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, threaded members movable into and out of engage ment with said screw for the purpose specified, resilient means within the standard swiftly to elevate said screw when the threaded members are out of engagement therewith, and cam means for forcing said threaded members into engagement with said screw. 7

4. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, and threaded elements mounted on the rotatable member,'frcely movable ever the latter into and out of en- 'gagement with said screw.

5. In a device of the type described, the

combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, said rotatable member having a relatively flat top surface, and threaded elements mounted on said flat top surface of the rotatable member, for a turning movement therewith, and horizontally movable upon said surface into and out of engagement with said screw.

6. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, threaded elements carried by said rotatable member, for a turning movement therewith and horizontally movable into and out of engagement with said screw, and a cam on said rotatable member adapted to be turned to move the threaded elements into engagement with said screw.

7. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, threaded elements carried by said rotatable member, for a turn ing movement therewith and horizontally movable on its top surface into and out of engagement with said screw, a housing for.

' and cam means within said housing, adapted to force said blocks into engagement with said screw.

9. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, vertical blocks having threaded front faces, carried by said rotatable member for a turning movement therewith and horizontally movable along its top surface into and out of engagement with said screw, a housing for said blocks, and

an annular cam in said housing, passing;

through recesses in the rear portions of said blocks, for forcing the latter .into engagement with said screw.

10. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, vertical blocks having threaded front faces, carried by said rotatable member for a turning movement there'- with and horizontally movable along its top surface into and out of engagement with said screw, a housing for said blocks on i said rotatable member, each block having a transverse recess in its back portion, a vertical pin in each block passing through said recess, and an annular cam in said housing adapted to engage the pins in said blocks, to move the latter into engagement with said 11. In a device of the type described, the combination with a tubular, standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, said rotatable member having a'relatively fiat top surface, ra-

dial guides on said top surface, vertical blocks having threaded front faces, carried bysaid ,rotatable 'membei, and having groovesin their bottom portions adapted to fit'over said guides for a horizontal movement'into and out ofengagement with said screw, a'ho'usin'g forsaid blocks on theero tatable member, radial slots in the top of said housing, and screws projecting from the tops of said blocks into said radial slots, to cooperate with the guiding pieces on the top of the rotatable member, in guiding said blocks into and out of engagement with said screw.

'12. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, vertical blocks having threaded front faces,.carried by said rotatable member for a turning movement therewith and horizontally movable along its top surface into and out of engagement with said screw, each block having a transverse recess in its back portion, a vertical pin in each block passing through said recess, an annular cam adapted to enter the recesses in said blocks, hook shaped portions formed on the inner circumference of said cam, adapted to receive said pins to hold the blocks out of engagement with the screw, and neutral portions on the inner circumference of said cam adapted to engage said pins to hold the blocks in engage ment with said screw, the circumference of the cam curving inwardly from each hookshaped portion to the first neutral portion to the left, gradually to bear against the pins in the blocks for: the purpose of forcing them into engagement with said screw.

13. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a laminated crown gear surrounding said standard, and supported thereby, means'carried by said crown gear, adapted to move said screw, a transverse shaft supported by said standard, a laminated bevel gear on the innerend of said shaft, in mesh with said crown gear, and means for turning said shaft to raise or lower said screw.

14. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, means for raising and lowering said screw, a transverseshaft supported by said standard for 'op eratmg sa d screw raising and lowering means, an operating rod, a socket on said operating rod, and a collar and a ball on the outer end of said shaft adapted to be received by the socket on said operating rod, whereby the latter may be usedv to insert the standard under a loat.

15. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, means for raising and lowering said screw, a trans-v versezshaft supported by said standard for operating said screw raising and lowering means, a crank on theouter end of said shaft, a ball'terminal for said shaft, an operating rod, and a socket'on one end of said rod, having two oppositely disposed recesses adapted to receive said crank as the ball terminal of the shaft is inserted in the socket, said socket and ball forming a ball and socket joint to permit the shaft to be turned by the rod at an angle.

16. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, a rotatable member surrounding said standard, and supported thereby, threaded members freely movable over the top of said rotatable mem her into and out of engagement with said screw, and cam means for moving said threaded members over the top surface of said rotatable member into engagement with said screw.

17. In a device of the type described, the combination with a tubular standard, of a screw vertically movable therein, threaded means movable into and out of engagement with said screw to raise or lower it, an annular cam for forcing the threaded means into engagement with said screw, a finger piece for turning said cam, a flat portion on the outer end of said finger piece containing a hole, an operating rod, and a transverse pin on the outer end of said rod, adapted to enter the hole in said finger piece, whereby one may turn the cam from a standing position near the load under which the standard is inserted.

In testimony whereof I have hereunto set my hand this 16th day of August, 1919.

ALEXANDER XV. MARE. Witness:

HOWARD S. SMITH.

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