| 摘要 |
A bidirectional overspeed device is provided for an elevator system having an elevator car for travel within a hoistway along a guiderail. The elevator includes a governor rope running from a governor sheave at the top of the hoistway to a tension sheave at the bottom of the hoistway, and a bidirectional overspeed device. The bidirectional overspeed device comprises a bidirectional governor, a first safety brake, a second safety brake and a bidirectional linkage apparatus. In the event of an overspeed condition in either direction, the bidirectional governor clutches the governor rope, thereby operating the bidirectional linkage apparatus which connects the governor rope to the safety. Depending on the direction of the car travel, the linkage apparatus is either pulled upward or downward. Consequently, either the first or second safety is engaged and the elevator car is stopped.
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