| 摘要 |
A safety brake unit for a mine cage or similar elevator car. A safety line suspended in the elevator shaft extends through the safety brake unit mounted in the mine cage and several such units may be mounted in a single cage. The safety brake unit includes a pair of brake drums about which the safety line is wrapped. The brake drums have circumferential grooves to hold the wraps of the line and one drum is offset or tilted with respect to the other to permit the line to extend continuously about both drums. The brake drums are electrically actuated and switches are provided in the electrical circuits to close whenever the mine cage is released from its hoist or commences to drop too fast. Whenever several safety brake units are mounted in a single cage, the electrical actuating means will permit all of them to operate in unison. A mechanical fail-safe brake setting mechanism may also be included to set the brakes if the electrical system fails.
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