Patent GB-156641-A (GB)
Title: Improvements in or relating to operating means for doors
IPC: E05F15/10
Filed: 1921-01-06
Abstract: 156,641. Crane, H. W. Aug. 16, 1917, [Convention date]. Switches, actuating; electromagnetic switches. - An electrically - operated door opening and closing device comprises a highvoltage direct or alter-. nating-current circuit containing a motor and associated switches, and a lowvoltage circuit including hand and platform - operated switches, the motor shaft being in driving- connection with a timing-switch controlling contacts in both circuits for alternately starting, stopping and reversing the motor. The general arrangement of the system is shown in Fig. 12, Figs. 6 and 8 being sectional views of the timing- switch device, and Fig. 1 a side elevation of the motor F and gearing operating the racks 30, 31 for actuating a sliding door. The device may be also used to operate swinging or roll-up doors. The high-voltage circuit includes the motor F, solenoid motor-reversing switches D, E and a step-by-step switch B under the control of a switch 15 operated by a solenoid C in the lowvoltage circuit 116 containing hand and platformoperated switches 17, 117. The timing-switch A has a shaft 71 connected by a pin-and-slot connection with the shaft 42 driven by the motor, and its cam members 99, 96 respectively operate switch elements 16 in the low-voltage circuit, and switches 19 and 21, 22 in the low and high-voltage circuits respectively. The worm shaft 40 of the motor gears with a pinion 41 loose on the shaft 42 and connected through clutch elements 45, 46 to the door-operating shaft 44. The switch element A comprises a casing 68 fixed to the base plate 39 of the machine, with a screwthreaded shaft 73 mounted in bearings 69, 70. The reciprocating nut 74 has a projection 75 engaging a slot 76 in a frame 77, 78 secured at its ends to the shaft. The frame and associated parts are connected by a spring 92 to a lug 95 on the casing 68. Mounted on the cylindrical end portion 77 of the frame is a cam plate 96 formed with an arcuate slot 97 in which a pin 98 on the member 77 engages. By this arrangement, the frame may be rotated with a certain degree of movement before movement is imparted to the cam plate controlling the contacts 19, 21, 22. The cam plate 99 controlling the contact 16 is mounted on an extension of the bearing member 70 and is connected by a spring 100 engaging a lug 102 with a pin 103 fixed to the base of the casing 68. The member 99 carries a pair of pivoted pawls 104 projecting on either side of a lug 105 on the end of the frame member. As the frame member is rotated, subsequent to the movement of the nut 74 to either end of the slot 76 by the continued movement of the shaft 71 driven by the motor, the lug 105 contacts with one of the pawls and rotates the cam 99 until a projection 107 trips the pawl and allows the cam 99 to be returned by the action of its spring. In the general arrangement shown in Fig. 12, the contacts 24, 59 have completed the circuit 48, energizing the solenoid E to close the contacts 26 and thereby causing the operation of the motor F to close the door. The rotation of the shaft 73 causes the nut 74 to reciprocate to the end of the slot 76 and thereafter causes the partial rotation of the frame members 77, 78, the cam 96 moving in a clockwise direction by the engagement of the pin 98 with the end of the slot 97. This causes a projection of the arm 109 to engage a recess in the cam 99, opening the contacts 16, 20 and breaking the circuit in the low-voltage line. Actuation of the parts by the operation of the pushbuttons 17 is thereby prevented. As the cam is further rotated, the projection 110 engages the arm 109 of the contact member 16 and re-establishes the circuit. The solenoid C is thus energized to close the contact 15 and thereby actuate the solenoid D, which rotates its switch members on to the dead points 59. The circuit through the solenoid E is thus broken and the motor is stopped with the door in the fully closed position. Previous to the stoppage of the motor, the cam plate 99 will have been tripped and returned to the position shown in Fig. 12. With the stoppage of the motor, the contacts 21 have been opened by the contact arm passing off the point 114 of the cam 96, preventing the solenoid being re-energized until the motor operating-circuit has been reversed. The projection 115 of the cam has also closed the contacts 19, leaving the lowvoltage circuit in condition ready for the opening operation. To open the door, one of the pushbuttons 17 is closed, or the weight of the car entering the garage is applied to the floor-plate 117 to close the contacts 18. This closes the low-voltage circuit, energizes the solenoid switch C. and the operation of the switch B closes the contacts 23, 59 to energize the reversing solenoid switch D and start the motor to open the door. When the pin 98 reaches the left-hand side of the slot 97, the cam 96 is moved to close the contact 21 and open the contact 19, thereby breaking the circuit which may have been completed by the floor plate 117, which is thus inoperative except when the door is in the fully open position. The switch 27 in the low-voltage circuit is normally closed. It is operated a cam 119 on the arm 118 by means of which the clutch members 45, 46 can be disengaged against the resistance of a spring 120. This clutch device provides for the disengagement of the motor and for the disconnection of the controlling line so that the door may be operated manually.