| 摘要 |
A chain break safety device for vertically moving, bi-parting, counter-balanced elevator doors which comprises a block having a vertical lead disposed tapered opening, said block having limited vertical moveability with respect to the door, a braking member positioned within the tapered opening, a cage for maintaining the braking member in the tapered opening, and a resilient member adapted to deflect under the tension of the counter-balance system and move said block into a non-braking position and to cause the block to move into a braking position upon failure of the counter-balance system, thus pinching the braking member between the tapered surface and a static vertical member of the elevator door system. |
