Haulage apparatus for mining machines

Details Haulage apparatus for mining machines Haulage apparatus for mining machines

1978-09-07

1981-09-01

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

B66F 108

Patent

active

042867711

ABSTRACT:
The two propulsion rams are simultaneously actuated in an opposite sense with respect to each other by control means comprising a directional control valve which controls the supply of pressure fluid to the hydraulically actuated track-engaging means and which is actuated in accordance with the operation of means detecting when at least one of the propulsion rams is approaching the end of at least one stroke. The control means also comprises a further directional control valve which controls the supply of pressure fluid to the propulsion rams and which is actuated in accordance with the supply of pressure fluid from the first mentioned direction control valve.

REFERENCES:
patent: 3860215 (1975-01-01), Chambers
patent: 3994475 (1976-11-01), Chambers

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