| 摘要 |
An elevator car braking apparatus includes a gear drive assembly for compressing one or more springs which are coupled by a cam follower to one or a pair of brake shoes. When the springs are released from a compressed state, the brake shoes engage and grip hoisting ropes, part of the hoisting apparatus or the car guide rails, within a predetermined time from the start of a brake application cycle. During a brake application cycle, the springs move the cam follower along cam surfaces shaped and disposed to cause the cam follower to move at least one of the brake shoes toward the other brake shoe. The gear assembly includes clutch means for disengaging from and engaging with a gear or axle of the gear assembly during decompression and compression of the springs, respectively. A resilient material in the braking apparatus initially accelerates movement of the cam follower when the springs begin to decompress, and may protect gears of the gear assembly from damage at the end of a brake release cycle. |
