| 摘要 |
A wheel clamp for immobilising vehicles is secured by a combination lock. This can minimise the need for attendance by a policeman or other official and maximise the inconvenience to the driver of the immobilised vehicle. The device has three radial arms 1 each with a central slot along which is a rack 9 of teeth, engaged by a common central pinion 5 so that all three arms can be wound in or out simultaneously. After being wound in, the arms are fixed in position by means of a combination lock 13 with pins 15 which are advanced into holes 7 in a plate 6 fixed to the pinion, before the lock is set. <IMAGE> |
