Mine hoists

Details Mine hoists Mine hoists

1974-06-14

1976-01-27

Spar, Robert J.

Implements or apparatus for applying pushing or pulling force

Step-by-step traveling bar

Pawl actuated

254173R, B66D 126

Patent

active

039348563

ABSTRACT:
A mine winder has two cable drums and a braking mechanism for each. Each braking mechanism includes means operable to sense if the cable is moving and in which direction and the length of cable paid out and to issue a control signal containing this information. Brake control means is operable on receipt of the control signal to operate braking means and apply to the drum a braking effort based on the information in the control signal. A cable movement detector sensitive to the speed of movement of the cable may be provided to be operative to send a corresponding control signal to the brake control means. The braking means may be air-pressure operated, the brake control means adjusting the air pressure according to the control signal received.

REFERENCES:
patent: 2823897 (1958-02-01), Kellogg
patent: 3158356 (1964-11-01), Carlson et al.
patent: 3497787 (1970-02-01), Fuelster et al
patent: 3596070 (1971-07-01), McCool et al.
patent: 3759489 (1973-09-01), Jones
patent: 3780990 (1973-12-01), Edlund et al.
patent: 3819156 (1974-06-01), Sleracki

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