| 摘要 |
PCT No. PCT/EP92/01164 Sec. 371 Date Dec. 7, 1993 Sec. 102(e) Date Dec. 7, 1993 PCT Filed May 23, 1992 PCT Pub. No. WO92/21845 PCT Pub. Date Dec. 10, 1992A safety device for a passage closure, such as a garage door, having a drive, a maximum permissible load value which can be set, and a control device by which the drive can be switched off, switch-off occurring when the maximum permissible load value has been reached and a signal S2 is sent to the control device at a time T2. A sensor is disposed in the area of the leading edge of the closure. When the sensor encounters an obstacle, it emits a signal S1 to the control device at a time T1. Upon reaching the maximum permissible load, the control device determines a DELTA T based on T2-T1, compares it to a preset value and if the preset value is exceeded, changes the direction of movement of the closure.
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