| 摘要 |
What is proposed is an automatic door, such as a trellis door, entry barrier or the like, especially as an access door to a sales area, for example in a supermarket, which has a horizontal arm (16) connected fixedly in terms of rotation to a vertical shaft (14), the shaft (14) being rotatable by a motor (M). An electromagnetically controlled braking device (20, 22) prevents a rotation of the shaft (14) when the motor (M) is not supplied with current and allows a rotation of the shaft (14) when the motor (M) receives current.
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