US2835029A

US2835029A - Pulling tool

Info

Publication number: US2835029A
Application number: US362239A
Authority: US
Inventors: Sr James F Collins
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-06-17
Filing date: 1953-06-17
Publication date: 1958-05-20
Anticipated expiration: 1975-05-20

Description

May 20, 1958 J. F. COLLINS, SR 2,

PULLING 'TOOL Filed June 17. 1953 2 Sheets-Sheet l w .4. J mwgoaagsn Wilma: 19 W%/ W May 20', 1958 J. F. COLLINS, SR 2,835,029

PULLING TOOL Filed June 17, 1953 2 Sheeis-Sheet 2 Janus KCollins, Sr.

United States Patent PULLING TOOL James F. Collins, Sr., Des Moines, Iowa Application June 17, 1953, Serial No. 362,239

3 Claims. (Cl. 29-261) My invention relates to improvements in pulling or extracting tools and is more particularly adapted for pulling bushings, bearings, seals, sleeves and the like to which access can be gained from only one side.

Many types of tools have been designed for pulling a bearing or the like when only one side is available and most of these have some form of operable jaws that appear to have a common characteristic in that the smallness of the bore in which the tool can be inserted is determined by the width across the jaws in closed position. As a result many such tools cannot be used on small bearings or bushings having a half inch bore, for example, since reducing the size of the tool for such purposes would reduce its strength and efiiciency and thus limit its capabilities and use.

With these observations in mind it is one of the important objects of my invention to provide in a pulling or extracting tool for bearings or the like a pair of jaws capable of being inserted through a bore of less diameter than the distance across .the jaw ends when in closed position for a pulling operation.

Another object of this invention is to provide a tool of the above class having means for providing a screw jack action to forcibly remove the object to be withdrawn.

A still further object of my invention is to provide a tool as above described having a selective means for increasing the capacity of the screw jack.

These and other objects will be apparent to those skilled in the art.

My invention consists in the construction, arrangement, and combination of the various parts of the device, whereby the objects contemplated are attained as hereinafter more fully set forth, and specifically pointed out in my claims, and illustrated in the accompanying drawings, in which: i

Fig. 1 is a perspective view of a preferred embodiment of my new tool,

Fig. 2 is an enlarged side elevational view of the jaw assembly of this tool illustrating the manner of inserting it in a bushing or the like,

Fig. 3 is an enlarged longitudinal sectional view of my pulling tool shown in place for pulling a bushing and illustrating the screw jack means applied thereto together with adjustable position of the jaws shown by broken lines,

Fig. 4 is an elevational view of a modified pilot rod for strengthening the action of the screw jack,

Fig. 5 is an enlarged elevational view of my new pulling jaws adapted to the knockout type pulling means, and

Fig. 6 is an enlarged end view of the jaw end of Fig. 5.

Referring to the drawings a block member or crosshead is designated at 10 and for more particularity in reference thereto the top is indicated at 12 and the bottom at 14. A channel 16 extends across the bottom portion of crosshead 10 so as to communicate with the sides thereof (Fig. 1). A screw threaded opening 18 extends through block 10 transversely of channel 16 from top 12 to bottom 14. At each corner of the lower por- 2,33%29 Patented May 20, 1958 ICC tion of block or crosshead 10 is disposed a pivot pin 20 transversely of the axis of opening 18 on which is mounted the respective jaws 22. Each jaw 22 consists of the head 24 through which pin 20 passes, an inwardly extending downwardly slanted shoulder 26, an elongated arm 28 extending from the shoulder and a claw 30 on the free end of each arm bent outwardly at right angles thereto. Shoulder portions 26 are each disposed toward opening 18 so that with arms 28 in closed or adjacent position (Fig. l and solid lines of Fig. 3) they intersect a portion of the plane of opening 18. It will also be observed that the inner sides of each arm 28 i provided with a groove 32 co-extensive with its length whereby with the jaws closed these grooves are complementary to each other in forming a passageway as will later appear.

A shaft 34, externally threaded as at 36 and provided with an internally threaded bore 38, is mounted in opening 18 where it can engage shoulders 26 on jaws 22 to spread them apart in an obvious manner. A head 40 is affixed to the outer end of shaft 34 to facilitate its rotation with a wrench and preferably I also place on shaft 34 the lock nut 42. A pilot rod or screw jack means 44 consists of an elongated rod having the external threaded portion 46, shank 47 and head 48 and is extended through bore 38 to engage the center hole on a shaft or the like 50 when pulling a bushing or bearing 52. The threads 46 are engageable in bore 38 and a wrench can, of course, be applied to head 48.

With reference to Fig. 3 it will be observed that the shank portion 47 of rod 46 is reduced in diameter relative to the portion at threads 46 so that it can pass through grooves 32 in jaws 22 when they are. closed. Thus, the rod 44 can be used in the smallest opening into which the jaws can be inserted. However, in bushings where the jaws must be extended as indicated by the broken lines in Fig. 3, pilot rod 44 may be formed as shown in Fig. 4 where shank 54 is not reduced relative to the diameter at threads 46. Thus, the larger shank greatly increases the strength of the screw jack action. For this purpose bore 38 is preferably made large enough so that a number of rods 44 adapted to fit bore 38 can be made available with diiferent diameter shank portions for selective use as required.

Referring now more particularly to Fig. 2, I wish to point out one of the important features of this invention. Due to the fact that slot or channel 16 extends from side to side of crosshead 10 there is considerable latitude of lateral pivoting available to jaws 22. As a result, when they are both pivoted in the same direction one will lie upon the other but the claw portion 30 of one jaw will be extended forwardly relative to the claw portion 30 of the other jaw. The effect of this position is to permit the jaws to be passed through the bore of a bushing 52 of a smaller diameter than would be possible if the jaws moved scissor-like on a common pivot pin since in my invention one claw 30 follows the other at a distance rather than the two passing through the bore side by side. It will thus be appreciated that relatively heavier jaws can be used on small bores so that the range of use of my tool on varying sizes of bearings, bushings and the like is considerably greater than that of other similar tools.

In Figs. 5 and 6, I have illustrated the use of my pulling jaw assembly on what is sometimes called the knockout type puller as distinguished from the screw jack type above described. For this purpose I provide an elongated guide rod 56 on which is slidably disposed the ram 58. A handle 60 at one end of rod 56 and a stop nut 62 near the other serve to limit the movement of the ram. Below nut 62, rod 56 is threaded for engagement in bore 38 and in all other respects the jaw assembly is the same as described above. Once in place (Fig. 5) the ram 58 is objects sought to be obtained.

Some changes may be made in the construction and arrangement of my pulling tool without departing-from the real spirit an'dpurpose of my invention, and it is my intention to cover by my claims, any modified forms of structure or used mechanical equivalentswhich may be reasonably included within their scope.

I claim:

1. In a pulling tool, a crosshead having a channel communicating with three sides and provided with a threaded opening in communication with said channel, a pairof jaw members oppositely disposed and pivotally connected at the respective end portions of said channel, said jaws formed to converge from their respective pivot points to a point within said channel in'longitudinal alignment with said opening and then projecting from said channel in parallel relationship when in closed position, a claw on the outer end of each jaw, a shaft disposed in said openingand engageable at-times with said converging jaw portions for separating said jaws, and said jaws pivotable at times in the same direction whereby the major length of one lies upon the major length-of the other in juxtapostion with their outer ends in longitudinal spaced relationship so that the claw on one jaw precedes the claw on another in negotiating the bore of an article to be removed. U

2. In a pulling tool, a crosshead having a channel formed in one side, a pair of jaws each consisting of-a head, a shoulder on said head extending at an angle thereto, an arm extended from said shoulder in a plane offset from said head, and a claw on the end of said arm,said jaws oppositely pivotally mounted in said-channel at said head sections so that in closed position their respective shoulders converge within said channel and their respective arms project therefrom in parallel relationship, said crosshead. provided with a threaded opening communicating with said channel, said shoulders when closed having their adjacent sides in longitudinal alignment with said opening, a shaft disposed in said threaded opening and engageable at times with said shoulders within said channel for separating said jaws, said shaft having an internally threaded bore, and a pilot rod extending through said bore and adapted tothr'ust against a surface in a pulling action by said jaws.

3. In a pulling tool, a crosshead having a channel formed in one side,'a pair of jaws each consisting of a head, a-shoulder on said head extending at-an'angle thereto, an arm extended from said shoulder in a plane offset from said head, and a claw on the end of said arm, said jaws oppositely pivotally mounted in said channel at said head sections so that in closed position their respective shoulders converge within said channel and their respective arms project therefrom in'parallel relationship, said arms eachprovided with a groove co-extensive'with the length thereof, said grooves being complementary in forming a passageway, saidtrosshead provided with'a threaded opening communicating with said channel, said shoulders when closed having their-adjacent sides in longitudinal alignment with said opening,'a shaft-disposed in said-threadedope'ning and engageable at times with'said shoulders for separating said jaws, said shaft having'an internally threaded bore, atpilot rod-extending through said bore and having'a shank portion disposed in and movable in said passageway, the'shank end of -said'pilot rod-adapted to thrust against a surface in a pulling action by said jaws, and said passageway affording means for movement of the shank portion of said pilot rod longitudinally of said arms without disturbing the closediposition of said arms.

References Cited in the file of this patent UNITED STATES PATENTS 1,478,964 Klay Dec. 25, 1923 1,893,414 Johnson'et'al Jan. 3, 1933 FOREIGN PATENTS 156,826 Switzerland N0v. 1,1932