US 2821776 A
Description (OCR text may contain errors)
Feb. 4, 1958 H. E. 'KEIST'ER UNIVERSALLY ADJUSTABLE mzcmmcm. FULLER Filed June 7, 1954 INVENTOR Hafo id E. Keisber.
ATTORNEY d States 2,821,776 UNIVERSALLY ADJUSTABLE MECHANICAL PULLER This invention relates to a mechanical puller for removing cams, gears, bearings, and the like from shafting, as well as from gear and cam transmission assemblies. This invention is, in fact, adapted to be used wherever the work of removal must be accomplished in very close quarters where it is necessary to have a strong yet simple and compact tool having a very solid gripping action and very great pulling power.
There have, heretofore, been many different kinds of mechanical pullers, generally of this type, but none of these prior art tools has been found capable of being used with any size and shape of workpiece either hollow or solid. Furthermore, none of these prior art tools has been capable of the complete adjustability present in the tool embodying this invention, especially while yet maintaining its high degree of strength and rigidity. In addition, none of the previous tools have combined any of the above qualities with the ability to provide a straightline pulling power instead of the angular pull which is largely due to their inability to adjust to the particular type of work required.
One object of this invention, therefore, is to provide a mechanical puller, the arms of which are capable of a generally universal adjustment.
Another object of this invention is to provide a mechanical puller capable of providing a straight-line pull on all occasions.
Another object of this invention is to provide a mechanical puller capable of being adjusted to fit various shapes and sizes of workpieces.
Another object of this invention is to provide a me chanical puller having separable parts which are easily assembled and disassembled.
Another object of this invention is to provide a mechanical puller which is simple, compact, having relatively few parts but which is capable of exerting great strength.
Other objects of this invention are to provide an improved mechanical puller of the character described that is easily and economically produced, which is sturdy in construction, and which is highly eflicient in operation.
With the above and related objects in view, this invention consists in the details of constructive and combination of parts as will be more fully understood from the following description when read in conjunction with the accompanying drawing in which:
Fig. l is a front elevational view of a mechanical puller embodying the present invention.
Fig. 2 is a side elevational view of the device shown in Fig. 1.
Referring now in greater detail to the drawing wherein similar reference characters refer to similar parts, there is shown a supporting bar in the form of a solid, cylindrical rod, made of steel or the like, which is provided at its center with an enlarged boss 12 having a screw-threaded bore 14 which is adapted to threadedly receive an externally screw-threaded rod or bolt 16 having 2,821,776 Patented Feb. 4, 1958 TMIC a polygonal head 18 for receiving a wrench or similar tool and a hardened pointed tip 20 adapted to functionally engage against a gear shaft or the like.
Slidably mounted on the rod 10 are a pair of brackets 22 and 24, each of which is provided with a transverse bore which is adapted to slidably engage the rod 10. One of these brackets is positioned on the rod at one side of the boss 12 and the other on the opposite side, as illustrated in Fig. 1. However, it is within the scope of this invention to place both brackets on the same side of the bore in order to allow the gripping members to be hereinafter described, which extend from the brackets, to enter into openings which cannot be reached otherwise.
Since the bores in the brackets as well as the rod 10 are cylindrical in shape, the brackets 22 and 24 are adapted not only to slide longitudinally of the rod but also to rotate on the rod. In this manner, the brackets 22 and 24 may be moved toward or away from each other and at the same time either one or both may be angularly adjusted relative to each other. After the desired adjustment has taken place, the brackets may be locked in such adjusted positions by means of set screws 26 on the bracket 22 and set screws 28 on the bracket 24, these set screws extending through the tops of the brackets and bearing against the rod 10.
Extending from one end of each bracket, in the central portion thereof, is a threaded bore, these bores being indicated at 30 in bracket 22 and at 32 in bracket 24. Each of these bores is adapted to threadedly receive a threaded extension of the gripping members 38 and 40, these extensions being indicated at 34 and 36.
The gripping members 38 and 40 are each illustrated as comprising a relatively straight arm provided with a. laterally extending hook or gripping portion as at 42 and 44. However, it is within the scope of this invention to make them of any desired length or shape in ac cordance with the type of work required of them. Furthermore, these members 38 and 40 may be adjusted lengthwise by means of screwing the extensions 34v and 36 any desired distance into the threaded bores 30 and 32.
The gripping members 38 and 40 may not only be placed on the rod 10 in the position shown in full line in Fig. 1 wherein the portions 42 and 44 point inwardly, but may also be reversed so that the portions 42 and 44 point outwardly as shown in dotted outline in Fig. 1.
The full line position is used in gripping the outer periphery of a cam, gear or the like while the dotted outline position is used when gripping an internal surface of a hollow member. The dotted outline position also shows how the gripping members can be adjusted to increase or decrease the spacing therebetween according to the size and shape of the workpiece to be handled. In Fig. 2, the dotted outlines show the gripping members in two different angular positions as a result of rotating the bracket on the rod 10.
The above described universal adjustment of the gripping members ad'apts the device for use with a variety of sizes and shapes of workpieces and also adapts it to enter angular and other odd shaped openings in order to reach the part to be pulled.
The fact that each of the gripping members may be individually adjusted to different angular positions makes the device especially useful where a gear or sprocket having spokes or holes is to be gripped and pulled, since, in such case, one gripping member may be arranged to grip the outer periphery of the gear or sprocket while the other gripping member may be arranged to grip the internal diameter of the article.
Although this invention has been described in considerable detail, such description is intended as being illustrative rather than limiting, since the invention may wliewanirmsly :enibodied, and the scope of the invention-is to be determined as ,elaimed.
Having thus set forth and disclosed the nature of this invention, what is claimed is:
.A mechanical wuller nomprising 5a xylindricalnrossbar, ,a screw-threaded bore zcentrally located in .said bar, said bore extending through said bar substantially per pendicularly of thelongitudinalaxis ofsai'dlbargascrewthreaded rod :adjustablypositionedtin said ihore said rod being provided with wrench-gripping means :81 lone end with abutment :means at the :opposite ;end, .a pair of brackets having :cylindrical 'bnres extending vtherethrough, said .last mentioned bores (encompassing said than: in slidable androtatable engagements,meansto locksaidibrackets iin individually adjusted positions on said bar, and .a gripping :means .releasably ;connected to :each of said adjustable to vary the distance to which it extends from its respective bracket.
References Cited in the file of this patent UNITED SIATES PATENTS 1,359,768 Thomason Nov. 23, 1920 1,426,885 -Mdhrman, Aug. 22, 1922 1,431,378 Derry Oct. 10, 1922 1,478,648 Grahek Dec. 25, 1923 I ROR'EIGN BAZFENTS 664,000 France Apr. 16, 1929