Patent GB-269456-A (GB)
Title: Improvements in operating devices for sliding doors
IPC: B66B13/08
Filed: 1927-01-17
Abstract: 269,456. Waygood-Otis Ltd., (Otis Elevator Co.). Jan. 17, 1927. Operating and controlling sliding doors by lever and link mechanism and by springs; checks. - Sliding doors, more particularly the hatchway doors of lifts, are operated by means of a series of links pivotally connected to one another, to the door sections, and to a fixed point, the connections between the links and adjustable door sections or between the respective links comprising clamps adjustable upon said links. The movable door sections 21, 22 are interconnected by links A, B and by links C, are connected to a closing spring and check device mounted on the side wall. The link A is adjustably mounted in a clamp 30 that is pivoted at 31 on a plate 32 secured to the door sections 22. This clamp is shown in section in Fig. 6. A similar clamp 40 connects the ends of the links A, B. At an intermediate point of the lever B is a clamp 52 that is connected through a bracket arm with the inner edge of the door 21. The link C that is connected to the end of the lever B by a clamp 55, is formed of a number of sections C<1> - - C<3> provided with serrated sockets 66 and joint pins 70 of the form shown in Fig. 16, in order that these link sections may be set so that the links A, Band C are in planes parallel with the door section. A handle 80 is provided for operating the links. The spring and check device is shown in Fig. 4. The lower end of the cylinder 94 is pivotally connected to a bracket 97 mounted on the wall, and the operating spindle 90 is connected at 93 to a lug 92 of the lever C. A tension spring 106 for closing the doors is fixed at 107 to the cylinder and encloses the upper part of the check cylinder, the upper end of the spring engaging the lower flared ends of a sleeve 100 that is secured at its upper end to the rod 90. The check device comprises a piston 110 at the lower end of the rod 90, a one-way ball-valve device 116 with a ball-supporting pin 117 being provided. A bye-pass 120 with an adjusting needle 13 is also provided, the lower end of the piston being bevelled at 124. To facilitate the upward movement of the piston, the upper part of the cylinder has grooves 125, and an air vent 133 is also provided. The outer casing 135 has an air vent 137. For installing the device, the door sections are first moved to the closed position, the links A, B, C are pivotally connected to each other, the links A, B are pivotally connected to the door sections, and the sections C<1> - - C<3> of the link C are then adjusted to one another and connected to the assembled closing-spring and check device. In operation, the operator pulls down the handle 80 into the dotted-line position, the door sections moving in parallel planes into an assembled position at the side of the fixed door section 20. The upward movement of the rod 90 places the spring 106 under increased tension so that, when the handle, is released, the door closes and the links move back to their initial position, the check device cushioning the final movement of the door. The operating circuit for the lift vehicle is opened when the doors are opened by means of a link 150 that is connected to the arm 92 and carries a contact blade 152 which makes contacts with switch contacts 153 only when the door is closed. The door sections are supported by rollers 23.