Metal working – Means to assemble or disassemble – Heat exchanger
Patent
1989-10-27
1990-10-02
Watson, Robert C.
Metal working
Means to assemble or disassemble
Heat exchanger
29252, 29282, B23P 1904, B23P 1526
Patent
active
049598996
ABSTRACT:
A tube pulling device for extracting a tube from a tube sheet includes a cylindrical housing having an operating chamber with an opening at the forward end thereof and the rear end of the operating chamber being closed. A front piston is reciprocally disposed in the operating chamber and provided with an axial passage therethrough. A tubular extension is slidably disposed in the operating chamber opening and is connected to the front piston. The tubular extension includes a plurality of spaced jaws for engaging the bore of the tube to be extracted. A rear piston is provided and reciprocally disposed in the operating chamber. The rear piston includes a piston rod disposed within the axial passage of the front piston and extends for slidable movement in the operating chamber opening. An expansion device is interconnected to the piston rod and extends through the tubular extension of the front piston. The front piston includes a fluid passageway communicating with the rear piston and a source of fluid for supplying fluid to the rear piston. A control device is disposed in the fluid passageway for controlling flow of fluid from the supply source to the rear piston. An actuating device is disposed in the rear piston for engagement with the control device for terminating the flow of fluid through the fluid passageway to the rear piston when the force acting on the rear piston reaches a predetermined magnitude thereby preventing further expansion of the plurality of spaced jaws.
REFERENCES:
patent: 3367011 (1968-02-01), Sipher
patent: 3369287 (1968-02-01), Brochetti
patent: 3791011 (1974-02-01), Keys
patent: 3835520 (1974-09-01), Sismore
patent: 4077102 (1978-03-01), Smith
patent: 4280274 (1981-07-01), Filer
patent: 4283826 (1981-08-01), Miller
patent: 4369569 (1983-01-01), Armstrong et al.
patent: 4679315 (1987-07-01), Overbay
patent: 4829648 (1989-05-01), Arzenti et al.
Dresser Industries Inc.
Watson Robert C.
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