Patent GB-190815446-A (GB)
Title: Improvements in and relating to Door Openers and Closers.
Inventor: SCOTT FRANK
Filed: 1908-07-21
Granted: 1908-12-03
Abstract: 15,446. Scott, F., and Shively, J. B. July 21. Door opening and closing apparatus.-A single or double door for use in hotel, store, and other large buildings is operated by mechanism actuated by an electric motor which is started by persons stepping on a depressible platform extending from each side of the door. In order that the door shall close when no one is on the platform, switches are placed in the motor circuit, which are closed automatically by t h e opening of the door and thus maintain the motor circuit until the door is closed. A vertical sectional view of the apparatus applied to a double door is shown in Fig. 1. The section A is slidably mounted to move in and out of a pocket 1 in the wall 2, but the section B is hinged to the doorframe and comprises two parts 3, 4 hinged together. Both sections have pins 8 projecting from their tops and working in grooves 7 in the door frame, and at their inner lower corners are provided with vertical sleeves 9 in which slide bolts 10 whose lower ends carry rollers 11. These rollers work in spiral grooves 16 formed on a roller 15 which works in a chamber below the door. The ends of each groove 16 open into annular grooves 17, in which the rollers run when the door is fully opened and the rotation of the roller continued. When reversal of the rotation of the roller takes place the rollers are directed into the grooves 16 by spring guards 18. The shaft 23 of the roller 15 carries mitre gears 21, 22 which constantly mesh with a mitre gear 20 on the shaft 19 of the motor M. The hubs of the wheels 21, 22 are formed into toothed clutch elements which engage with a sliding clutch element 25 feathered on the shaft 23. This clutch is thrown into engagement by a lever 26 secured to the rock shaft 27, which is connected by links 28 to bell-crank levers 29 actuated by the platform C, Fig. 2, extending on opposite sides of the door. The platform comprises two sections 30, 31, the outer edges of which are hinged to the floor with which they are kept flush by springs 34. Beneath the platform, and arranged to be operated by its depression, are starting-switches a, a<1>, a', a<3> in the motor circuit. Switches b, b<1>, b', b<3> are mounted on the door sections in such a way that, when the door is opened, they will close and maintain the motor circuit until the door is closed. A circuit-controlling member 35, Fig. 4, is hinged to the door, and is pressed outwards when the door opens by springs 37 until it bears against a stop. The strips 35 bear against push-buttons 38 when the door is closed and keep the switches open. The push-buttons 38 bear against metal plates 42, which are inserted to prevent wearing of the members 35. Channels are cut in the door to receive the conductors leading to the switches. The conductors are preferably of the cord type, and straining is prevented in the section B by making it loose at 49, while sagging is prevented in the section A by passing it round a weighted pulley 47, which works in a chamber 45 in the wall. The switches a, a<1>, a', a<3> are connected in parallel with wires c, c<1> leading to the switch S for connecting the motor and supply circuits. In the wire c<1> is an automatic switch consisting of a solenoid s through which the current passes when either pair of the switches a is closed. When the solenoid is energized, the motor M is connected in circuit so as to drive the door-operating device. When the door opens, the switches b, b<1>, b<2>, b<3> are closed, and since they are connected in series with wires d, d<1> which are connected to the wires c, c', the motor will be driven as long as the door remains open regardless of the condition of the switches a, a', a<2>, a<3>. In the modification shown in Fig. 6, the platform D is in one piece and is constrained to move vertically. Beneath the platform are rods 56 slidably mounted in bearings 57 and carrying cones 58 which are engaged by pointed lugs 59 secured to the platform. When the platform is depressed, one of the rods 56 will be shifted longitudinally, and will actuate the clutch. The rod is returned to its normal position by a spring 60. The movable member of the clutch connecting the motor shaft and roller shaft is connected to oppositely disposed levers 63, mounted on fulcrums 64 and engaging at their outer ends between collars 61 on the rods 56.