Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Reexamination Certificate
2001-03-16
2002-07-09
Hail, III, Joseph J. (Department: 3723)
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
C029S282000, C029S263000, C029S264000, C072S114000
Reexamination Certificate
active
06415490
ABSTRACT:
The invention relates to an improved portable power tool for pressing a machine part onto a shaft under a press fit between the machine part and the shaft.
In particular, the invention concerns a portable power tool intended for the above purpose and comprising a reaction spindle with a threaded end portion for engagement with a threaded co-axial bore in the shaft, a push-carrier which is axially movable between a rear rest position and a forward end position and which is arranged to apply an axial press force on the machine part, and an activation mechanism for exerting an axial activation force on the push-carrier while moving the latter axially relative to the reaction spindle in the machine part mounting direction.
In a previously known power tool of this type, the activation mechanism for accomplishing the axial press force comprises a hydraulic piston device. This prior art solution is not satisfactory since the tool is dependent on the access of hydraulic power at the actual work site. This is a restricting factor for the use of the tool. Also at work sites where hydraulic power is available the inevitable hoses for communicating hydraulic fluid to and from the tool make the tool awkward to handle.
In order to avoid the above mentioned drawbacks, the invention provides a power tool with a non-hydraulic activation device and with an improved handling and an unrestricted work site location.
A preferred embodiment of the invention is described below in detail with reference to the accompanying drawings.
REFERENCES:
patent: 3654792 (1972-04-01), Mead
patent: 4321814 (1982-03-01), Martin
patent: 4368631 (1983-01-01), Tanikawa
patent: 5555613 (1996-09-01), Schimdt
Björkman Karl Gunnar
Caruso James
Szabo Dennis Wells
Atlas Copco Tools AB
Frishauf Holtz Goodman & Chick P.C.
Shanley Daniel
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