Air operated hydraulic torque wrench pump

Details Air operated hydraulic torque wrench pump Air operated hydraulic torque wrench pump

1996-09-20

1998-07-21

Lopez, F. Daniel

Motors: expansible chamber type

Independently operated timer, delay, pattern or cyclic control

Fluid actuated valve with volume chamber delay means

91 4R, 91 35, 60394, 60409, 173 2, 173 11, 417 12, 417 46, F15B 2102

Patent

active

057821585

ABSTRACT:
A hydraulic pump assembly for powering a hydraulic torque wrench is air-powered and has hydro-pneumatic control circuitry which continues operation of an air motor which drives the hydraulic pump for a post-advance period after an advance actuator is deactuated. Operation of the pump is continued for a period sufficient to retract a double-acting torque wrench, to permit subsequent advances of the wrench within the post-advance period without restarting the pump or to permit a single acting wrench to be moved from one fastener to the next within the post-advance period without restarting the pump. Operation of the pump is terminated when the post-advance period expires if the advance actuator is not reactuated, so as to conserve energy and avoid unnecessary heating of the hydraulic fluid.

REFERENCES:
patent: 3084674 (1963-04-01), Watson
patent: 4074612 (1978-02-01), Miller
Applicant's Exhibit A, catalog page regarding "Pegasus.TM." Air Hydraulic Torque Wrench Pump, Pub. #9413-364 of Enerpac, A Unit of Applied Power Inc., Butler, WI, dated Apr. 1994, admitted prior art.

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