| 摘要 |
PCT No. PCT/DE90/00496 Sec. 371 Date Aug. 23, 1991 Sec. 102(e) Date Aug. 23, 1991 PCT Filed Jul. 2, 1990 PCT Pub. No. WO91/00406 PCT Pub. Date Jan. 10, 1991.A safety arrangement for a motor-driven door or gate used to close building entrances or doorways, in which a vertically movable overhead door consists of one part or a multiple number of parts. An elastically deformable hollow rubber section is provided at the closing edge of the door, and this hollow rubber section has an interior hollow space with first and second ends. At the first end of this hollow space, there is an air pressure-wave receiver signal transformer, whereas an air pressure-wave transmitter is connected to the second end. This transmitter generates a continuous air pressure oscillation having a first pulse duration and a first pulse frequency when the closing edge is freely movable through a path of motion of the door. The continuous oscillation has a second pulse duration which differs from the first pulse duration, and a second pulse frequency differing from the first pulse frequency when the closing edge strikes against an object positioned in the path of motion of the door. The oscillation is continuously generated by the transmitter and is continuously received by the receiver for the purpose of monitoring continuously the closing edge, and detect when the closing edge abuts against an object, so that the movement of the door may be stopped or reversed.
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