Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1994-02-28
1996-05-21
Gorski, Joseph M.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
81 32, 173 17, B23P 1904
Patent
active
055177409
ABSTRACT:
A tool for removing a metal plug from a tube with repeated pulling impulses includes a pneumatic cylinder defining an interior, cylindrical chamber. A distal end surface of the cylinder defines an anvil. A cylindrical slug, or hammer, is sealingly slidable within the chamber in response to a pressure difference above and below the hammer within the chamber. The cylinder is rigidly connected to the plug so as to hang therefrom, the weight of the cylinder providing a static pull force working in conjunction with the pulling impulses. A pulling impulse is provided by first raising the hammer above the anvil by pneumatically creating a first pressure difference wherein the pressure below the hammer is greater than the pressure above the hammer, then creating a second pressure difference wherein the pressure below the hammer is no greater than the pressure above the hammer in order to drive the hammer against the anvil at speed. The tool is also adapted for disengaging an expander member engaged in a tapered plug shell with a mandrel that includes a push-rod having an end extending into the top of the chamber proximate the plug. Repeated displacement impulses are applied to the expander member by applying a different sequence of forces to the hammer so as to cause it to repeatedly strike the push-rod against the expander member. The tool and a method of using the tool are particularly suited to removing a plug from a heat exchanger tube in a nuclear powered steam generator.
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Boone Paul J.
Costlow Annette M.
Holmes Randall A.
Roberts James J.
Gorski Joseph M.
Westinghouse Electric Corporation
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