Brake for a hoisting apparatus
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United States of America Patent
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Jan 20, 1998
Grant Date -
N/A
app pub date -
Oct 3, 1995
filing date -
Oct 5, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A brake for a hoisting apparatus including a hoisting line, a drum for the hoisting line, a hoisting motor and a brake system for braking of the hoisting cable, the brake system consisting of a hydraulic brake and a mechanical brake. The mechanical and the hydraulic brakes are connected to a common transmission which is driven by the drum when this rotates freely, and the mechanical and the hydraulic brakes are controlled by a common controller for controlling the distribution of braking power between the two brakes. The control system distributes the braking power automatically between the brake systems. The transmission can also be connected to an autodriller for controlling the weight on the bit.
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