Patent GB-285472-A (GB)
Title: Improvements in and relating to operating and securing devices for lift doors and gates
IPC: B66B13/08
Filed: 1927-12-03
Abstract: 285,472. Waygood-Otis, Ltd., (Assignees of Brady, T.). Feb. 18, 1927, [Convention date]. Operating and controlling doors by springs and checks.-The operating-mechanism for a lift-cage door is connected to an interlocking bar which co-operates with a member to secure the door-operating lever mechanism in its door-closing position. The securing means may be released as the cage comes to rest at a landing, as shown in Fig. 3, or the securing means may be released by a pedaloperated device by the car operator, as shown in Fig. 9. In Fig. 3 the slidable door 1 is connected by links 11, 16 with a bar 64, Fig. 7, adapted to be engaged by a fixed pin 67 to secure the door in its closed position. One end of the bar 64 is connected to a closing-spring and check device 28, shown in Fig. 4. When the door is in its closed position a shoulder 76 or a lever 74, pivotally mounted at 73, rests against the bar 64 and forces it into engagement with the securing pin 67. The lever 74 is secured to a rod 82 that is connected at its other end to the operating lever 85 of a switch 87 with a switch bar 90 adapted to bridge contacts 92, 93 in the control circuit of the lift cage motor. The lever 74 is also connected with a bar 95 that has a spring connection with a set of links 101 carrying a roller 112. When the car comes to rest at a floor and the motor 127 is de-energized, a cam rail 114 falls by gravity, and its abutment strikes a buffer 130. The links 115, 116 cause the rail 114 to move outwardly and engage the roller 112, which is moved anti-clockwise to lift the bar 95 and cause the lever 75 to swing upwardly. This causes the rod 82 to lift and open the cage-motor control circuit. A shoulder 77 on the lever 74 strikes the bar 64 until it is released from engagement with the pin 67; the door is then free to be opened into the position shown in Fig. 3 by the intending passenger. This opening movement stresses the closing spring 58, which closes the door when it is released, the closing movement of the door being controlled by the check piston 31 fitted with a one-way valve 33. As the door closes the links 11, 16 swing downwardly. The locking pin 67 does not engage with the recess 70 in the bar 64 until the car button is pressed and the motor 127 thereby energized. The motor then winds up the chain 124, raising the rail 114 and allowing the roller 112 to move to the right, the lever 74 moving downwardly and its shoulder 77 moving away from the bar 64; the pin 67 then engages in the recess 70 and secures the bar 64 and the door in the closed position. The switch bar 90 moves the contact plate to bridge the contacts 92, 93, and the circuit of the lift cage motor control is completed. As shown in Fig. 9, the door is manually operable by the attendant by a handle 133 connected through links 165, 166 to the securing bar 129 and closing spring and check device, the bar 129 co-operating with a pin 139 to secure the door in its closed position. Instead of the motor 127 used in the previous arrangement, a pedal 136 operable by the attendant is provided for controlling the operation of the releasing lever 135 and switches 87. When the door is at a landing and in the closed and locked position, it is opened by the attendant pressing on the pedal. This movement is transmitted to the cam rail 153 through the bellcrank lever 137, link 140, lever 141, shaft 146 and lever 149: the rail 153 then moves outwardly and strikes the boss 156 of lever 157, which. together with levers 160, 161 and shaft 158, turns about the pin 162. The movement of the lever 160 causes the link 164 to move upwardly, and the lever 135 is moved to open the switch 87 and thereafter disengage the pin 139 from the bar 129, when the door is free to be opened. This is effected by the attendant pulling on the handle 133 to break the toggle joint between the levers 165, 166. When the door is again closed and the pedal released, the tension spring 143 moves the lever 141 in a clockwise direction and the cam rail 153 is retired, the releasing lever 135 then moving by gravity to effect the securing of the door and the switch 87 to close again. The rail 114 and its motor 127, Fig. 3, may be used in conjunction with the operative linkage used according to Fig. 9, instead of the pedal arrangement, and these arrangements may be applied to other forms of door operating mechanism. Specification 269,456 is referred to.