Patent GB-1300082-A (GB)
Title: Door lock actuating mechanism
Inventor: SPENCER REGINALD JAMES
IPC: E05B65/36
Filed: 1969-03-13
Abstract: 1300082 Releasable fastenings DEFENCE SECRETARY OF STATE FOR 6 March 1970 [13 March 1969] 13336/69 Heading E2A A door lock actuating mechanism for moving a plurality, of separate door locking mechanisms comprises an actuator 11 to 13 for moving each respective door locking mechanism, movement of each actuator moving the door locking mechanism between a locking condition and an unlocking condition, a respective manually operable control valve 17, 18 connected to each of two of the actuators 11, 12 for moving either of the two actuators so that the corresponding door locking mechanism moves between the two conditions, means 36 for supplying pressure fluid and means for distributing the pressure fluid to each actuator and each control valve, each said actuator and each control valve being connected to fluid valve 42, 44 via said distributing means so that when one of the control valves 17 or 18 is manually operated to move its respective actuator and door locking mechanism from one condition to the other, the pressure fluid is supplied to all said remaining actuators to cause their respective door locking mechanisms to move from one said condition to the other. In the construction shown the actuators 11 and 12 are connected to the front door locking mechanism (not shown) of a vehicle and the actuators 13 and 14 are connected to the rear door locking mechanisms of the vehicle; the pressure fluid distributing means includes a spool valve 47 which is connected to two reservoirs 50, 56. The pressure fluid supply means 36 is an air compressor run from the engine of the vehicle which via a one-way valve 37 supplies a reservoir 34' which in turn supplies compressed air via a pressure control valve 35 to the control valves 17 and 18. The fluid valve means are shuttle valves 42, 44. As shown in Fig. I each of the actuators is in the condition in which the locking mechanisms are in unlocking conditions and the actuators, on both sides of their pistons 11b, 12b, 13b and 14b, are vented to atmosphere via a passage 73 in the spool valve; the reservoir 50 is pressurized via the control valve 17 and the shuttle valve 44; the reservoir 56 is vented to atmosphere via the shuttle valve 42. If a sill button 20 for the control valve 17 is manually depressed, the piston 11b is moved to the bottom of the cylinder 11a and thus the respective locking mechanism is moved to locking condition. Compressed air is then fed to shuttle valve 42 which pressurizes reservoir 56 and although the supply of compressed air to the shuttle valve 44 via control valve 17 is cut off the shuttle valve 44 is supplied with compressed air via the control valve 18 so that pressure in the reservoir 50 is maintained; thus the spool valve remains in the Fig. I position under the balancing influence of equal pressures in the reservoirs 50 and 56 and this allows compressed air to be fed via the passage 72 in the spool valve to each of the actuators so causing the pistons of the actuators 12, 13 and 14 to move downwardly and thus moving the respective locking mechanisms to the locking conditions. The movement of the actuator 12 moves its control valve 18 downwardly and this cuts off the supply of compressed air to the shuttle valve 44 and the reservoir 50 and exhausts to atmosphere via the shuttle valve 44; thus the spool valve 47 moves to the right under the pressure in the reservoir 56 and vents the actuators to atmosphere. The movement of the control valve 18 downwardly also supplies compressed air to the left hand side of the shuttle valve 42 which is still supplied with compressed air to its right hand side via the control valve 17. If now the control valve 17 is manually raised by its push button 20, the respective door locking mechanism is put in unlocking condition and compressed air is supplied via the control valve 17 to the right hand side of the shuttle valve 44 which pressurizes the reservoir 50; the spool valve does not move because of the equal pressures in the two reservoirs and via its passage 71, compressed air is fed to the bottoms of each of the actuators to raise the pistons of the actuators 12, 13 and 14 so that the respective locking mechanisms are placed in the unlocking conditions. The upward movement of the piston 12b moves the control valve 18 upwardly and this restores the actuating mechanism to the condition shown in Fig. 1 venting the reservoir 56 to atmosphere via the shuttle valve 42 and this causes the spool valve to move to the left so that all the actuators are vented to atmosphere via the passage 73. If the sill button 21 is moved manually instead of the sill button 20 a similar sequence takes place. Oil can be substituted for compressed air if desired.