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    • 1. 发明专利
    • Improvements in Lifting and Horizontally Folding Warehouse Doors for Counterbalancing and Automatic Closing.
    • GB190509962A
    • 1906-02-01
    • GB190509962D
    • 1905-05-11
    • ERWOOD JOHNWALCH ROBERT HILTON
    • ERWOOD JOHNWALCH ROBERT HILTON
    • 9962. Erwood, J., and Walch, R. H. May 11. Door opening and closing apparatus.-Relates to a method of opening and closing folding warehouse doors. The two sections of the door are hinged together, the lower section being preferably longer than the upper section by the thickness of the door. The upper section is hinged to the horizontal bar 3, which is guided on the rigidly-mounted vertical rods 4. Each lower corner of the door is mounted on wheels 11 provided with pivot studs 11 , Fig. 5, which project behind the flange 12 of the vertical angle-iron 12 to retain the pulleys in their tracks. The door is actuated through a system of pulleys. Each of the lifting-cables 15, 16 is connected to the links 14 at the lower edges of the door, the cable 15 passing through the bar 3 over the pulleys 9, 8, attached to the bar 3, 10, and thence to the weight 18. The other chain 16 at the left-hand side of the door passes over pulleys 9, 8, across the door, and over the pulley 10 to the weight 18, which need only be 40 per cent. of the weight of the door. For operating the door, an endless driving-chain 21 passes over a large working pulley 20 rigid with the doubly-grooved pulley 10. To obviate the tendency of the door to remain buckled outwards, pins 24 and hooks 26 are provided on the upper and lower section of each door respectively to engage with the inclined face of the hooks 23 and pins 27 attached to the guide-track 12.