US1644839A - Automatically-adjusting gear puller - Google Patents

Description

, 1,644,839 Oct. 11, 1927. v M. L; LANDRUM AUTOMATICALLY ADJUSTIjNG GEAR FULLER Filed Aug. 24, 41926 4 Fig. 1

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Vl/.Lan drum ABY Patented Oct. 1l, 1927.

UNITED STATES MARK L. LANnRUivi, or PLYMOUTH, cALrFoRNrA AToMATICALLY-Ar-Jusrrnd GEAR PUL'LER.

Application filed August 24, 1926.

without necessitating moving the center pull-V !H ing screw.

A further object is to arrangeA the parts' of the tool so that when a pulling pressure is exerted it will be impossible for the arms to slip from the gear, and the greater the l pressure, the greater will be the tendency for the arms to grip the gear.

A further object of the invention is to produce a simple and inexpensive device and yet one which will be exceedingly eti'ective 3" tor the purpose for which it is designed.

These objects l accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following speciication and claim.

in the drawings similar characters ot ret'- erence indicate corresponding parts in the several views:

Fig. 1 is a sectional elevation of my improved gear puller.

Fig. 2 is a top plan view ot the tool.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 denotes a cupped disc having a central hub 2 projecting from the concave Yface of the disc. A pulling screw 3 is threaded through the hub, said screw having a square or similar shaped head 4 to enable a wrench to be applied.

Slidable on the hub 2 is a sleeve 5 formed with a hand grip portion 6 on its outer end, the screw projecting through yand beyond said sleeve a certain distance.

Projecting vradially trom-the sleeve are a plurality oi spaced pairs of ears 7 which 'form bearings for th-e pins 8 of a corresponding number ot arms 9. The arms project beyond the disc 1 a certain distance and atk their outer ends (which are opposite to the headed end of the screw) are provided with inwardly projecting pads. 10 to pass under and engage the side of a gear to be pulled. j

The arms are formed with heavy lugs 11 which overhang and engage the concave face of the disc, and they also have guide fingers 12 engaging the opposite and convex face of sern No. 131,193;

the disc, slots 18 being thus formed between the members 11 and 12.

The curvature and depth ot these slots relative to the disc is such that the arms turning on the pins S may inovc inwardly towardeach other until, the padsl 10 are fairly close together so as to engage a small gear-5 or they may swing outwardly until the ends of the members 11 and 12are nearv the rim of the disc, as indicated in dotted lines in Fig. 1.

Vith this position of the arms of course a large gear may be engaged thereby. Further separating movement of the arms is prevented. by the -ends thereof above the pins 8 coming in contact with abutments 14C formed on the sleeve 5 between the bearing ears 7 This movement takes place automatically when the sleeve 5 and disc 1 are moved to and from each other, since the center of curvature ot the disc and slot 13 is on the central longitudinal axis of vthe sleeve and hub. As the disc and pivot points of the arms are moved to vand from each other, the arms therefore must swing one way or the other so as to maintain the Center of curvature of the slots 13 at the same point as the center of curvature of the disc 1.

The sleeve and disc are held from turning relative to each other by any suitable means, such as for instance a pair of lugs 15 on the disc between which the linger 12 of one of the arms 9 passes.

In operation the handle member 6 is grasped by one hand and the head of the screw 3 in the other. The arms are then separated by a relative movement between the parts to which these elements are connected, so as to enable the pads 10 to pass by the periphery of the gear 16 to be pulled. The movement of the hand engaged parts is then reversed until the pads 10 pass under and engage the face of the gear furthest from the tool. The screw is then advanced by hand until it engages the end of the gear shat 17, when a wrench is applied to rthe head 4; to further turn the screw and exert the necessary pulling pressure.

y Such pressure of course causes the gear to be pulled from the shaft and also causes the arms by reason of the disc and the lugs 11 engaging the same, to tend to move even closer together, so that slipping of the arms from the gear is impossible.

It will be seen that all load is taken by the disc and by the heavy arm lugs 11, which together with the arms are designed to have sufficient strength to take any strains which may be imposed thereon.

The fingers l2 do not come into play with the pulling operation and are simply provided to insure simultaneous separation of the arms when the tool is being withdrawn from the gear.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such'devian tions from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claim.

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

A gear puller comprising a screw for engagement with the end of a shaft, arms for engagement with a gear on the shaft, a cupped disc, a hub thereon through which the screw is threaded, a sleeve member slidable on the hub, pivotal connectionsbetween the arms and sleeve member, and projections on the inner faces of the arms straddling the opposed faces of the disc and orming slots concentrically alined with the iso.

In testimony whereof I affix my signature.

MARK L. LANDRUM.

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