US2136004A - Gear puller - Google Patents

Description

Nov. 8, 1938. A. L. CORNWELL GEAR FULLER Filed 001;. 25, 1937 2 Sheets-Sheet 1 ,ffizvenior;

AH THUR 1., CORA/WEZ 4 GEAR FULLER Filed 001:. 25, 1937 2 Sheets-Sheet 2- ive/1:20

Patented Nov. 8 1938 UNITED STATES rnrlzrzTv OFFICE 2,136,004 GEAR PULLER Arthur L. Cornwell, Wellsville, N. Y. Application October 25, 1937, Serial No. 170,944

4 Claims.

This invention relates to tools or implements for removing gears from shafts on which they are mounted, or like .dissembling operations. A principal object of the invention is to provide a simply constructed, portable tool or implement that is adapted for convenient and efficient use and capable of adjustment and arrangement for engaging gears and pinions of a wide range of sizes. A further object is to provide an improved device wherein the gear engaging arms are acted on by spring means to cause yielding engagement of the arms with the gear, and also acted on by positive means to hold such arms securely engaged with the gear for the pulling operation.

The foregoing, and other objects and advantages of the invention, will be better understood from the following detailed description taken in connection with the accompanying drawings and distinctive features of novelty will be thereafter pointed out in the appended claims.

Referring to the drawings:

Figure 1 is a View partly in elevation and partly in central lengthwise section of an implement embodying the invention.

Figure 2 is an endwise view thereof, looking from the left in Figure 1, and with certain parts removed.

Figure 3 is a view similar to Figure 1, but showing the gear engaging jaws open.

Figure 4 is a perspective View of one of the gear engaging jaws removed.

Figure 5'is an elevation showing the device as arranged for engaging smaller sizes of gears; and

Figure 6 is a similar elevation showing the device as arranged for engaging larger gear sizes, the gear being shown in section.

in indicates the body or head of the device having a threaded bore therethrough, in which is fitted a screw stem l I. This stem l I may have a squared or hexagonal head Ha at its outer end, for application of a wrench or the like to turn the same, and its inner end may be formed with a central punch terminal lib, adapted to engage the end of a shaft S from which the gear G is to be removed. The head I is formed with opposite pairs of spaced apart ears or lugs l2, l3 extending radially outward therefrom. These ears or lugs l2, I3 are formed on the outer sides thereof, with open sockets I4, I adapted to receive fulcrum pins l6 extending transverse- 1y from each side of the inner end portions of gripping jaws l1. These jaws have their outer extremities formed with beaks Ila adapted to engage the gear to be pulled, these beaks as shown being passed through openings O of the gear to engage the inner gear surface. The jaws l1 are formed as bell crank levers having the shorter ends I 111 thereof extending transversely of the head as the jaws are mounted in the sockets M or I 5. The sockets M are located in the inner portions of the lugs l2, l3 and the fulcrum pins 3 are mounted therein as seen in Figures 1, 3, and 5 when the device is set for engaging smaller sizes of gears, the beaks Ha then extending inward towards each other. When the device is to be used for engaging larger sizes of gears, the jaws I l are removed and turned over as seen in Figure. 6, and the fulcrum pins l6 set in the outer sockets I5, the beaks Ila. then extending outward away from each other to better engage such larger gear sizes. In such case the shorter arms l'lb, whether extending inward or outward with respect to the head I0 as described, are engaged by a follower l8 sliolably fitted on the head ID. The outer portion of the head I0 is externally threaded and has fitted thereon a nut l9 constituting a clamping member having a knurled head l9a for turning same whereby it may be adjusted against the follower l8, causing the follower to press upon the arms Ho and swing the jaws I! either inward or outward, according to the setting thereof, to cause the beaks to engage the gear for removing the same. It is desirable that the jaws H be spring biased to cause them to be held yieldingly in engagement with the gear when they are applied thereto and before the nut I9 is screwed up so as to make such engagement rigid. For this purpose the nut is has a quite substantial range of adjustment on the threaded portion of the head l0 and a compression coil spring 20 is mounted to react between the head |9a of the nut and the follower It so as to press the follower yieldingly against the arms Ilb and thus swing the beaks Ila yieldingly into the engagement with the gear while the nut I9 is adjusted outward some little distance away from the follower I8 as seen in Figure 5.

The described implement is thus adapted to be quickly and easily engaged with gears or the like in a large range of sizes to apply the necessary pressure for removing the same from the shafts or equivalent elements on which they are mounted, and by reason of the action of the spring 20 the gear engaging jaws are spring biased to be pressed into engagement with the gear surfaces as they are moved to operative position, the operation of the nut [9 then permitting the jaws to be firmly and securely engaged with the gear as the stem H is operated to exert the necessary pressure for removing the gear from a shaft.

I am aware that the invention in each of its several aspects may be embodied in other forms without departing from the spirit or essential attributes thereof, and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention. w

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. An implement of the kind described, cornprising a head, a stem threaded therethrough adapted to engage a shaft end or the like, coactive gripping levers with hooked ends pivotally mounted in said head adapted to engage a gear or the like, and adjustable means on said head for acting resiliently on said levers to press them yieldingly into'engagement with such gear, said means equipped with a positive adjusting element, said means arranged also to impart positive pressure upon said levers at will to cause them to engage the gear rigidly for the pulling operation.

2. An implement of the kind described, comprising a head, means mounted therein for reactive engagement with a shaft end, gripping levers pivotally mounted on said' head for engagement with a gear or the like, a member having relatively elongated threaded engagement with said head with a spring interposed between the same and said levers, said member having means associated therewith for pressing said levers positively into engagement with the gear, or for exerting yielding pressure thereupon according to its position of adjustment.

3. An implement of the kind described, comprising a head having a threaded stem adjustable therethrough for engagement with a shaft end or the like, gripping members oppositely mounted on the head, formed as bell crank levers with shorter arms thereof extending transversely of the head, a follower slidable on the head and engaging said shorter arms, and adjusting means on the head engaging said follower to swing said gripping members into engagement with the work, said adjusting means being formed as an elongated nut with an operating head at its outer end, and with a compression spring located between said operating head and said follower adapted to transmit yielding pressure to said gripping mem-- bers when said nut is in an outer adjusted position.

4. An implement for pulling gears and the like, comprising a head, a threaded stem adjustable therethrough, lugs extending radially at opposite sides of said head and formed with inner and outer open sockets, bell crank levers having transverse fulcrum pins detachably fitted in either the inner or the outer'sockets at will, said levers having longer gripping arms projecting from the end of said head, and shorter arms extending radially of said head, said levers being reversible as to their mounting on said head, and adjustable means on said head for pressing upon said shorter lever arms yieldingly' or positively according to the adjustment thereof.

ARTHUR 'L. CORNWELL.

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