Line tensioning system

Details Line tensioning system Line tensioning system

1974-11-11

1976-06-15

Wood, Jr., M. H.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

242 7553, B66D 126

Patent

active

039632172

ABSTRACT:
This invention relates to a fluid system employing fixed and variable displacement pump-motors for cable tensioning and braking in a yarder cable hauling device. More particularly, the system includes a fixed displacement fluid pump-motor mechanically connected with the haulback cable drum of a yarder in combination with a variable displacement fluid pump-motor driven by the yarder engine for maintaining a selectable pressure differential across the fixed displacement pump-motor, thereby providing cable tension and regenerative braking on the haulback cable drum via the variable displacement fluid pump-motor. In one embodiment first and second fixed displacement fluid pump-motors are mechanically connected to the main line and haulback drums, respectively, to obtain cable tensioning and regenerative braking via the variable displacement unit in both directions of cable hauling. In a second embodiment a single fixed displacement pump-motor, mechanically connected with the haulback drum, is employed to provide cable tensioning and regenerative braking with the yarder engine via the variable displacement unit in only one direction of cable hauling.

REFERENCES:
patent: 2064295 (1936-12-01), Crane
patent: 2763467 (1956-09-01), Doolittle et al.
patent: 3346237 (1967-10-01), Erickson et al.
patent: 3378232 (1968-04-01), McIntyre

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