US2376721A - Pulling tool - Google Patents

Description

C. J. PIPER PULLING TOOL May 22, 1945.

Filed July 28, 1944 C. JPi vew IN VEN TOR.

Patented May 22, 1945 UNITED STATES PATENT OFFICE PULLING TOOL Charles J. Piper, Washington, D. C. Application July 28, 1944, Serial No. 547,082

1 Claim.

This invention relates to a tool designed principally for the extraction of ball bearings or the like from recesses or blind holes. Heretofore the extraction of ring-like devices from blind holes has been difficult and considerable time has been wasted in the performance of the operation.

It is the object of the present invention to provide a tool of this character which is simple and compact in construction and can be positioned readily within the recess or blind hole and the hearing or other object to be removed, it being possible thereafter to quickly adjust the tool so as to engage the bearing or other object, after which, by a further operation, the tool will act as a screw jack and forcibly remove the object to be withdrawn.

A still further object is to provide a tool which is inexpensive, can be conveniently carried, and will not readily get out of order.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein described, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawing the preferred form of the invention has been shown.

In said drawing Figure 1 is a section through a recessed structure containing a ball bearing to be removed therefrom, the tool constituting the present invention being shown immediately following its insertion thereinto.

Figure 2 is a similar view showing the tool partially in section, after it has been adjusted to engage the bearing and after the bearing has been partially withdrawn.

Figure 3 is a section on line 3-3 of Figure 1.

Referring to the figures by characters of reference, I designates a crosshead having a screw thread opening 2 extending through the center thereof. The ends of the crosshead are forked as noted at 3 and extending across each of these forks is a pivot pin 4, on which is mounted a head 5 located at one end of an arm 6 constituting a jaw of the tool. The other end of the arm has a lug 1 extending laterally therefrom. The head 5 has a cam 8 extending from that end remote from arm 6, and this cam comprises two inclined faces 9 and I0 merging to form a rounded peak II. A jack'screw or threaded rod 12 is extended through and engages the wall of the opening 2, and this screw has a head [3 at one end for engagement by a wrench.

Mounted on the screw between the crosshead l and the head [-3 is a disc M. That face of the disc nearest the crosshead is formed with an inwardly tapering recess l5, 7

Normally the arms 6 of the tool hang substantially parallel with the screw 8 2, as shown in Figure 1, at which time the distance between the outer ends of the lugs l is less than the diameter of the opening into which the tool is to be in-. serted.

The portion of the structure having the recess has been indicated as S and in this recess is seated the object to be removed. In the present instance it is a ball bearing B.

The tool is inserted into the bearing and recess until one end of the screw engages the bottom wall of the recess. The crosshead I is fed along the screw by rotating the screw and crosshead relative to each other until the lugs are positioned inwardly from the bearing B. At this time the disc It is fed along the screw until it comes against the inclined faces 9 of the two heads 5. Feeding of the disc will cause it to swing the cam portions 8 ofthe head 5 toward each other, as shown in Figure 2, and at the same time cause the lugs I to move outwardly into position back of the bearing B. With the parts thus set the screw I2 is rotated so as to feed the crosshead and the disc 14 toward the head I3 and as the screw is bearing against the bottom of the recess, such rotation will result in the forcible extraction or withdrawal of the bearing,

What is claimed is:

A tool for removing rings and the like from blind holes, including a crosshead, opposed members mounted therein, each having a cam at one end and a jaw at its other end and a fulcrum supported by the crosshead and located between the cam and jaw, each jaw comprisingan arm and a laterally extending lug, the lugs on the jaws being extended away from each other, a jack screw extending through and engaging a threaded opening in the crosshead between the members,

said members and screw being insertible into the ring or the like to be removed, said screws being proportioned to engage and thrust against the bottom of the blind hole from which the ring or the like is to be removed, and means adjustably mounted on the screw for engaging the cams to shift the jaws apart, said means comprising a disc, there being a tapered recess in one face of the disc proportioned to receive the cams and draw them together.

CHARLES J. PIPER.

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