Winding – tensioning – or guiding – Coil holder or support – Spool or core
Patent
1989-07-28
1991-04-16
Footland, Lenard A.
Winding, tensioning, or guiding
Coil holder or support
Spool or core
B65H 7542
Patent
active
050075993
ABSTRACT:
A hydraulically-actuated controller is disclosed for controlling delivery of hydraulic fluid from a variable-displacement, pressure-compensated pump to a hydraulically-powered reel on which is wound a cable or other flexible member extending from the reel to a tie point. Rotation of the reel is controlled appropriately to maintain the cable tautly between the reel and tie point as the distance therebetween changes. One use is on an electrically-powered mining vehicle, the power cable of which extends from a fixed power source to the vehicle-mounted reel. The controller is in a pay-in-mode whenever the distance between the reel and tie point is decreasing or remaining constant, and in a pay-out mode whenever said distance is increasing. During pay-in, pressurized hydraulic fluid is directed from the pump to the reel motor. During pay-out, pump output is occluded and fluid is directed through a restriction from the reel motor to the reservoir, the restriction serving to brake motor rotation. Two of four valves in the controller are hydraulically piloted in each position and biased in the pay-in position. A separate check valve ensures that pressure at the pilots is about equal during pay-in but unequal, favoring the pay-out position, when the reel is paying out cable.
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patent: 2764365 (1956-09-01), Davis et al.
patent: 2912184 (1959-11-01), Lee
patent: 3334839 (1967-08-01), Carlson
patent: 4114827 (1978-09-01), Maier
patent: 4511100 (1985-04-01), Oetringhaus
patent: 4537364 (1985-08-01), Pollman et al.
Atlas Copco Construction and Mining Holding AB
Darling John P.
Footland Lenard A.
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