US 2106741 A
Description (OCR text may contain errors)
J. F. HERBERT BUSHING BEMOVER Feb. 1, 1938.
Filed July 30, 1936 T R E B R E H R mF m. H p E m J Y B ATTORNEY Patented Feb. 1, 1938 UNITED STATES PATENT OFFICE 1 Claim.
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 3'70 0. G. 757) This invention relates to certain new and useful improvements in a tool for removing bushings and the like.
An object of the invention is the provision of 5 a simple and strong implement or tool adapted for the ready removal of bushings or sleeves, such as the bushings in cylinders of internal combustion engines, pieces of pipe, pipe nipples and face bushings from threaded openings that have been broken, leaving a portion threaded into an aperture without a projection which will permit the part to be removed by ordinary tools.
Another object of the invention is to provide a tool of the character described that may be used for removing bushings and the like, of different sizes within a certain range.
A further object of the invention is to produce such a tool which may be used with a standard socket wrench or any of the adjustable wrenches 90 now on the market.
A still further object of the invention is to provide a device of the character described that is simple and'durable in construction, reliable and eflicient in operation and one which can be manufactured and placed upon the market at a minimum cost.
With the above and other objects in view, the invention consists in the construction, combination and arrangement of parts as will be hereinafter more fully described.
Reference is to be had to the accompanying drawing forming a part of this specification in which like characters indicate corresponding parts throughout the several views, and in which Fig. 1 is a side elevation of the bushing remover,
Fig. 2 shows a bushing encased in an internal combustion engine cylinder block,
Fig. 3 is a side elevation of the tool showing a bushing that has been removed from an aperture, and
Fig. 4 is a section on the line 44 of Fig. 3.
In Fig. 2 there is represented by 5 an internal combustion engine cylinder block, or other casing, in which bushing 6 is mounted in a threaded aperture therein. When the bushing becomes worn and it is desired to replace it by a new one, a great deal of difliculty is usually experienced in removing the bushing without doing damage to the cylinder or casing, and it is an object of my invention toprovide a means whereby the bushing may be easily removed.
In carrying out the invention there is utilized a tool, Fig. 1, having an impact head I, preferably polygonal in shape, and a tapered shank or broach 8. The shank is provided with longitudinally disposed lands or ribs 9 and intermediate grooves or flutes I0, the faces of the lands being provided with peculiarly constructed serrations or teeth I I. The under sides of the teeth, or the sides adjacent the entrance end of the tool, are substantially at right angles to the axis of the tool, as indicated at l2, while the upper sides, or sides remote from the entrance end, are inclined at an angle of approximately 45 degrees to the axis of the tool. The outer faces of the teeth are not carried to a point or sharp edge as is usual in such constructions, but are flattened in the plane of the taper of the shank, so as to give considerable surface upon the outer face of the teeth. The serrations or teeth extend but partially the length of the lands leaving the portions adjacent the impact head with a flat smooth surface. The sections of the smooth por tions of the lands immediately above the teeth are straight, that is to say, extend parallel to the longitudinal axis of the tool for a short distance, and then taper or flare outward adjacent to the head 7. The said intermediate sections of the lands provide a. maximum bearing surface for removing the splined bushing, and the tapered end portions take up any lost motion that might exist were the tool not properly seated in the bushing when removing it. The width and heighth of the serrated lands is the same throughout their length.
The operation of the tool is as follows:
When it is desired to remove a bushing, the tool is driven into it by tapping the impact head with a suitable implement driving the teeth on the lands through the screwthreads I4 on the interior of the bushing. As is well known, the metal used for bushings is generally bronze or brass which is comparatively soft, and therefore it is an easy matter to cut into them. Owing to the taper of the shank or broach, the lands, as they are forced through the threads, cut deep key-ways l5 into which the lands have a snug fit, as may be seen more clearly in Fig. 4:, maintaining a continuous engagement with the metal of the bushing for the inserted length of the tool. After the tool has been firmly engaged with the bushing, as above described, a wrench or other suitable turning implement is applied to the polygonal head whereby the tool may be rotated producing a desired unscrewing rotation of the bushing to be removed.
It will be understood that the above description and accompanying drawing comprehend only the general and preferred embodiment of my invention, and that various changes in construction, proportion and arrangement of parts may be made within the scope of the appended claim without sacrificing any of the advantages of my invention.
The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.
What I claim is:
In a bushing removing tool, a head, a tapered shank, longitudinal rectangular ribs on and conforming to the taper of the shank throughout a portion of their length, and teeth on the ribs extending at right angles to the axis of the shank for cutting .keyways in thebushing for reception of the ribs.
JOSEPH F. HERBERT.