GB750705A - Improvements relating to locking means for vehicle doors - Google Patents

Abstract

750,705. Fastenings operated from a distance. DAIMLER-BENZ AKT.-GES. Jan. 15, 1954 [Jan. 17, 1953], No. 1223/54. Class 44. Locking means for a vehicle door comprises a bolt 14 operated by power means which is energized in accordance with the speed of the vehicle and becomes operative for shooting the bolt when a given vehicle speed is exceeded and an auxiliary means 16 in association with the bolt and so adapted that when the shooting of the bolt is obstructed, as when the door is not fully closed, the auxiliary means, under the influence of the power means becomes effective for causing a warning signal to be given to the driver. In its application to a motor vehicle, the bolt is shot by power means consisting of a piston 13 slidable in a cylinder 12 connected by a pipe 20 to an oil pump 21 which, for example, is accommodated in or on the change speed gear 22 of the vehicle and is in continuous driving connection with the vehicle wheels. The bolt is slidable in the piston but a head 17 on the bolt is normally kept hard against the piston by a spring 15 trapped between the piston and the auxiliary means 16 which consists of a sleeve on the bolt. A spring 18 bears on the other side of the sleeve and on a cylinder end and normally keeps the bolt retracted ; the spring 15 is, however, more powerful than the spring 18 so that the head 17 is kept against the piston. When the vehicle engine is running slowly the pressure produced by the pump is insufficient to overcome the pressure of the spring 18 to shoot the bolt, but when the engine reaches a speed, and the pump a pressure, determined by a throttle 24, the bolt is shot. In the event of the door not being properly shut, the spring 15 allows the piston to move relative to the bolt ; this movement brings together electric contacts 27, 28 on the piston and sleeve 16 to operate an alarm 30. The piston and cylinder may be replaced by a solenoid and the pump by a dynamo.