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    • 9. 发明专利
    • Improved Sash Fasteners and Lifts for Windows.
    • GB190324017A
    • 1904-10-06
    • GB190324017D
    • 1903-11-05
    • DOBSON DAVID BENNETMOFFAT ALEXANDER JAMES HARDY
    • DOBSON DAVID BENNETMOFFAT ALEXANDER JAMES HARDY
    • 24,017. Dobson, D. B., and Moffat, A. J. H. Nov. 5. Window opening and closing apparatus.-To the bottom of the rail of the lower sash are pivoted two metal l o o p s i, Fig. 2, which engage with the catches k on the window frame and serve both as lifts and fasteners. On the top rail of the lower sash is pivoted the bent lever A, the long arm b of which is weighted at the end. The stop-piece B, Fig. 3, fixed to the upper sash, by coming in contact with the short arm a of the lever A prevents the upper sash from being lowered more than suffices for ventilation without first raising the lower sash. By so doing, the lever A is allowed to fall back free of the stop B. The pin C, consisting of a metal tube through which a screw passes fixing it to the window frame, returns the lever A to its locking position when the lower sash is shut down. In Fig. 6 is shown another form of pin C. In a modification described in the Provisional Specification, a groove is provided in the stile of the upper sash, with which the arm a of the lever engages instead of with the stop-piece B, and the arm a is spring jointed. It is also stated that the pin C can be arranged to be moved out of the way, when desired.