US1203925A - Elevating-jack. - Google Patents

Description

LE GRAND SPARKS.

ELEVATING JACK.

APPLICATION FILED MAY a, 1916.

1 03,925. Patented Nov. 7, 1916.

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LE GRAND SPARKS, 0F MONTGOMERY, NEW YORK.

'ELEVA'IINGr-J'ACK.

Specification of Letters Patent.

Patented Nov. *7, 1916.

Application filed May 8, 1916. Serial No. 96,203.

To all whom z't may concern:

Be it known that I, LE GRAND SPARKS, a citizen of the United States, residing at Montgomery, in the county of Orange, State of New York, have invented certain new and useful Improvements in Elevating- Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This .invention relates to elevating jacks and has special reference to that type of elevating jack commonly called a screw jack.

One improved object of the invention is to provide a jack of this description wherein the operating crank for the jack will be located at a distance from the body of the jack or stand so that the latter may be positioned beneath an automobile or the like and operated without making it necessary for the user to get beneath the machine.

Another improved object of the invention is to provide a jack of this description which is so arranged that, when not in use, the operating handle may be folded so that the jack will not take up excessive space.

With the above and other objects in view, as will be hereinafter apparent the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawing, and specifically claimed.

In the accompanying drawing, like characters of reference indicate like parts in the several views, and Figure 1 is a side elevation of a jack constructed in accordance with this invention; Fig. 2 is a plan view thereof; Fig. 8 is a section on the line 33 of Fig. 1; Fig. 1 is a section on the line 4-4: of Fig. 1.

In carrying out the objects of this invention and in the present disclosure there is shown a base 10 having a tubular member 11 extending upwardly therefrom and constituting a stand. An elevating screw 12 provided with the usual swiveled head 13 is telescopically mounted in the tubular member 11 and is prevented from rotation relative to said tubular member by a suitable set screw 14 passing through the side of the tubular member and entering a. spline -way 15 formed longitudinally of the screw. Resting on top of the member 11 is a crown gear 16 provided with a centrally disposed threaded opening fitting on the screw and constituting the operating nut therefor so that when the gear is rotated the screw will be moved in or out of the tubular member according to the direction of such rotation.

Projecting from opposite sides of the tubular member is a pair of alined stub shafts l7 and 18. On the shaft 17 is rotatably mounted an intermediate crown gear 19 which meshes with the gear 16.

At 20 is a curved arm which has one end pivotally mounted as at 21 on the stub shaft 18 and this arm is curved around the member 11 and then projects tangentially to the curve as at 22 and terminates in juxtaposition to the intermediate gear 19. The free end of this arm has rigidly fixed thereto the inner end of a. sleeve 23 which extends radially to the axis of the stub shafts and is of considerable length. Journaled in this sleeve 28 is a crank shaft 2-1 and on the inner end of this crank shaft isa driving gear 25 which meshes with the gear 19 so that when the crank shaft is rotated and the sleeve 23 held stationary the gear 19 will rotate and thus effect rotation of the gear 16. On the outer end of the shaft 2 1 is provided a crank handle 26 for the purpose of rotating said shaft.

It will be obvious that if the sleeve 23 was not prevented from movement there would be a tendency for the gear 25 to travel around the gear 19 instead of moving this gear. To stop the movement of the sleeve 23 when the gear 25 is in operative position there is provided on the member 11 a lug 27 which engages with the arm 20 when the sleeve 23 is in horizontal position, this being the preferable operative position.

It will be noted that the gear 25 is much smaller than the gear 16 so that rotation of the crank handle 26 will cause a powerful rotation of the gear 16.

When the device is not in use the sleeve 23 will naturally, through the weight of the sleeve and connected parts, drop downward to the position shown in dotted lines in Fig. 1, the arm 20 resting against the member 11 or the crank handle resting on the ground as the case may be.

hen it is desired to use the device the sleeve 23 is moved to operative position and the arm 20 will then engage the lug 27. The jack may then be lifted by the sleeve 23 and placed in the desired position beneath the automobile, the crank handle sticking out from under the machine. Then, by rotating the crank handle in the proper dlrectlon the gear 16 is caused to rotate and thus in turn will cause upward movement of the screw 12.

There has thus been provided a simple and eiiicient device of the kind described and for the purpose specified.

It is obvious that many minor changes may be made in the form and construction of the invention without departing from the material principles thereof. It is not therefore desired to confine the invention to the exact form herein shown and described but it is wished to include all. such as properly come within the scope claimed.

Having thus described the inventioinwhat is claimed as new is 1. In a ack, a base having a tubular member extending upwardly therefrom and constituting a stand, an elevating screw telescopically mounted in said tubular member, a driven gear having a centrally disposed threaded opening constituting a nut and fitting on said screw, a pair of alined stub shafts projecting from opposite sides of the tubular member, an intermediate gear mounted on one of said. shafts, a curved arm mounted on theother shaft and extending the axis of said shafts, a crank shaft mounted in said sleeve, a driving gear on the inner end of the crank shaft and a crank handle on the outer end of the crank shaft.

2. In a jack a base having a tubular member extending upwardly therefrom and constituting a stand, an elevating screw telescopically mounted in said tubular member, a driven gear having a centrally disposed threaded opening constituting a nut and fitting on said screw, a pair of alined stub shafts projecting from opposite sides of the tubular member, an intermediate gear mounted en one of said shafts, a curved arm mounted on the other shaft and extending around the tubular member into juxtaposition to the intermediate gear, a sleeve on the free end of said arm extending radially to the axis of said shafts, a crank shaft mounted insaid sleeve, a driving gear on the inner end of the crank shaft, a crank handle on the outer end of the crank shaft and a lug on said tubular membe and constituting a stop to limit upward movement of said arm.

In. testimony whereof, I affix my signature, in the presence of two witnesses.

LE GRAND SPARKS. Witnesses: V

A. G. BROWNE, I Housron BnowN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.

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