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    • 11. 发明专利
    • Improvements in revolving doors
    • GB188294A
    • 1922-11-09
    • GB2182822
    • 1921-10-28
    • THOMAS BENJAMIN COLMAN
    • E06B3/90
    • 188,294. Colman, T. B. Oct. 28, 1921. Revolving doors.-In a revolving door having automatically collapsable wings, a notched disc 1 on the central supporting shaft 1 of the door, is engaged by spring-controlled latches 4 provided with spring-pressed bolts for holding the wings in their radial positions. The latches 4 turn about pivot pins 5 carried by fittings 6 secured to the top of the wings. Each latch carries a spring- pressed bolt 10 which is normally held by a spring 11 in its lowermost position where it engages a recess in the top face of the member 6. During movement of the door in either direction, a coiled spring 8 surrounding the pivot pin 5 is compressed by means of a projection 7 on the latchmember sliding in a slot in an abutment for the spring. When the wings are folded, the latches assume the dotted position shown in Fig. 2, the wings themselves turning about pivots 11 on plate hinges of the type described in Specification 22552/10.