US1688460A

US1688460A - Extractor for removing bushings and the like

Info

Publication number: US1688460A
Application number: US240009A
Authority: US
Inventors: Emmett L Fowler
Original assignee: JOHN S PRIVOTT
Current assignee: JOHN S PRIVOTT
Priority date: 1927-12-14
Filing date: 1927-12-14
Publication date: 1928-10-23
Anticipated expiration: 1945-10-23

Description

Oct. 23, 1928. 1,688,460

, E. L. FOWLER EXTRACTOR FOR REMOVING BUSHINGS .AND THE LIKE Filed Dec. 14. 192'? INVENTOR. Emmett Z. Rel/Z67, BY W ATTORNEY.

Patented Oct. '23, 1928.

V'UNITEDIMST'ATES PATENT. OFFICE.

EMMETT L. FOWLER, or WASHINGTON, nIs'rnIc'n on ICOLITMBIA, Assrenon on onn HALF '10 JOHN s. PRIVOTT, or-wnsnrneron, nrs'rnrc'r OECOLUMBIA.

EXTRACTOE FOR REMOVING BUSHINGS AND THE LIKE.

Application filed December 14, 1927. Serial No. 240,099.

This invention relates to extractors for removing bushings and the like and its object is to provide means to tap or screw into the inner walls of a bushing, thimble or tube and to secure sufficient purchase therein so that the tool and the bushing may be forced outward by pressure or a blow. v

A further obj ect of the invention is to provide means to guide the extractor into the bushing so that the thread cutting will be done in the proper direction and into the bore of the bushing, and to provide a stem and head to the tool to enable it. to be forced outward with the bushing.

These and other objects and details of the invention are more fully described in the.

followingspecification, set forth in the appended claims and companying drawin wherein:

Figure 1 is a side elevation of the improved extractor. I

Figure 2 is a similar view of the extractor showing its method of operation.

Fig. 3 shows how a blind bushing is eX- tracted.

In the removal of worn or damaged bushings and similar articles considerable difficulty is experienced in accomplishing same because of their being forced and jammed into sockets or bores prepared for them. The dividing of the bushing by means of a saw is laborious and takes much time while the forcing outward of the bushing by means of a chisel is also diflicult and laborious.

The present invention provides a tool that may be quickly tapped into the bushing and struck by a few blows and driven out.

\Vith all of these methods of removal the bushing is practically destroyed, although in the first instance it has to be removed because of its worn or injured condition.

In the drawings a bar of hard steel is shown having a polygonal upper end 5 for the reception of the handle 6 or a wrench by which it is turned.

Towards the middle of thetool screw threading means 7 is provided and consists of the grooves 8 and mutilated cutting threads 9 while the lower end of the extractor is a stem 10 terminating in a head 11 to which force is applied to perform the operation of removing the bushing.

illustrated in the ac-' I ting threads of uniform In Fig. 2 the bushing 12 is shown located n 1ts member 13 and the extractor is tapped 1nto the same. The bronze bushing being so much softer than the steel tool the threads 9 will readily cut into the bushing and it is thus screwed down a sufiicient depth to get enough purchase to carry it out of its bore when the head 11 is struck with necessary force.

In cases where the tool is to operate on blind bushings and Where access to the lower end of the stem is not possible the tool is screwed into the bushing and the stem finally reaches the interior bottom wall belowthe bushing and as the tool is rotated and supported by said bottom, the threads force the bushing upward and out of its socket.

To enable the tool to get its initial start in the bushing, as the threading is not tapered, thelower threads areblunted or mutilated and reduced in diameter so that they will cut their way at the beginning of the operation with more ease and gradually work up to the threaded portion of uniform diameter. This construction obviates the costly tapering of the threaded tool heretofore used and answers the same purpose as the blunted threads have been found in practice to readily cut their way into the comparatively soft metal bushing.

No blow on the'head of the tool is therefore necessary and itis the action of the screw that forces the bushing out.

It is obvious that the device may be other wise arranged or modified without departing from the essential features above described or from the scope of the appended claims. 7

What I claim asnew is: V

1. In extractors for bushings; a metal bar of'uniform diameter throughout its length and having between its ends mutilated cutting threads above the surface of the bar having blunted and reduced-diameter 7 tion, an opposite end for contact and cutdiameter and pitch betiveen the said ends and separated into ping means, and cutting threads located.

independent groups by longitudinal grooves above the initial tapping means and between 10 in the bar, the lower threads being blunted the ends of greater diameter than said bar to effect the initial cutting into the bushing. and separated by grooves in said bar.

3. In extractors for bushings, the combi- In, testimony whereof I hereunto afiix my nation of a metal bar of uniform diameter signature.- having rotating means at one end and acontact head at the other end; initial tap- EMMETT' L. FOWLER.