Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Reexamination Certificate
1999-10-12
2001-05-01
Watson, Robert C. (Department: 3723)
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
Reexamination Certificate
active
06223410
ABSTRACT:
TECHNICAL FIELD
The present invention relates, in general, to a pulling device for removing parts or components from a shaft, or the like, and, more particularly, to an improved pulling device that securely grips the part or component being removed and does not move across the surface of the shaft or the part during the removal process.
BACKGROUND ART
Pulling devices for removing gears, bearings, sprockets, etc. from shafts on which they are mounted are readily available. Such pulling devices typically utilize a pair of oppositely disposed jaws which are received over the outer periphery of the part or component being removed and grip the underside thereof during the removal process. Typically, such pulling devices have a central shaft which moves laterally with respect to the jaws and whose end contacts and rotates against the end of the shaft on which the part or component is mounted. In this manner, a force is applied to the underside of the part or component causing the part or component to move towards the end of the shaft on which it is mounted. Since the central shaft of the pulling device contacts and rotates against the end of the shaft on which the part or component is mounted, the end of the central shaft has a tendency to “walk across” the surface of the end of the shaft on which the part or component is mounted. When this occurs, the orientation of the pulling device becomes skewed with respect to the shaft on which the part or component is mounted causing the pulling device to become disengaged from the part or component being removed.
In view of the foregoing problems associated with presently available pulling devices, it has become desirable to develop a pulling device which securely grips either the outer periphery or the inner periphery of the part or component being removed and which, during the removal process, does not “walk across” the end of the shaft on which the part or component is mounted.
SUMMARY OF THE INVENTION
The present invention solves the problems associated with the prior art pulling devices and other problems by providing a pulling device which securely grips the part or component being removed and which does not “walk across” the surface of the shaft on which the part or component is mounted. The pulling device of the present invention is comprised of a pressure transmitting member interposed between a threaded central shaft and the housing of the pulling device. The pressure transmitting member is rotatable by means of handles attached to a torque ring which is mounted on the outer end of the pressure transmitting member. By rotating the pressure transmitting member, the threaded central shaft, which does not rotate, moves laterally with respect to the pressure transmitting member and the housing of the pulling device. The end of the threaded central shaft engages the end of the shaft on which the part or component is mounted. Jaws are attached at 120 degree angular increments to a collar which surrounds the housing, and the ends of the jaws engage the underside of the part or component being removed. Such engagement can occur either along the outer periphery of the part or component or the inner periphery thereof. Since the jaws are attached to the collar assembly at 120 degree angular increments, the pulling device securely engages the part or component being removed preventing the orientation of the pulling device from becoming skewed during the removal process. In addition, since the threaded central shaft of the pulling device does not rotate, but only moves laterally with respect to the housing and the ends of the jaws of the pulling device, the end of the threaded central shaft does not “walk across” the end of the shaft on which the part or component is mounted.
REFERENCES:
patent: 4059883 (1977-11-01), Osborne
patent: 4744132 (1988-05-01), Greene et al.
patent: 5159743 (1992-11-01), Somerville
patent: 5896639 (1999-04-01), Chen
Pearne & Gordon LLP
Watson Robert C.
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