Patent GB-785463-A (GB)
Title: Improvements in or relating to closures for openings
Inventor: HOWARD REGINALD FRANK
IPC: E06B3/44
Filed: 1954-11-08
Abstract: 785,463. Sliding windows; doors. MORRIS SINGER CO., Ltd. Dec. 13, 1955 [Nov. 8, 1954], No. 32296/54. Class 20(3) A window or door closure comprises first and second panels, the first panel being slidably mounted by its edges within guides at each side, each guide having pivotally connected thereto a lever which is pivotally connected to a support such that movement of the levers about their supports moves the guides and the first panel in a direction substantially at right angles to that in which the panel is slidable in the guides, into and out of a closed position in which the two panels are in edge-to-edge alignment in the same plane, the first panel when out of its closed position being slidable in a plane parallel to the second panel. Spring counterbalanced glass panels 1, 2 are mounted respectively in channels 5, 8 of guides 3, 4 and can slide in channels 7, 6 of the other guide when in the open position shown in Fig. 1. The guide 4 is moved forwards to bring the panel 2 into line with panel 1 by levers 11, 12 pivoted thereto at 9, 10 and to the window frame at 13, 14, the levers being joined to operate together by a link 17 pivoted at 15, 16. The lever 12 has an extension 19 connected at 20 to a link arm 21 to operating mechanism 22 comprising a disc 22a and operating handle 23, to guide 4 on the other side of the window being similarly connected through a link arm 24. The upper guide 3 has projections 25, 26 with angularly disposed slots 27, 28 in which slide pegs 29, 30 on the frame, the projection 26 being connected by a pivoted adjustable link 31 to an extension 32 of the link 17 so that as guide 4 is moved inwardly on operation of handle 23, the guide 3 is moved downwardly and slightly forward so that the panels 1, 2 lie in the same plane, abutting. In this position, the panels 1, 2 press against a weather strip 34 secured to the window frame and a glass strip 35 on the bottom, of panel 1 closes any slight gap between the panels. The construction shown in Fig. 2 is similar, but the movement of the upper panel 1 is by means of levers 39, 40 pivoted to guide 3 at 51, 52, to the frame at 47, 48 and to an extension 36 of link 17 by means of pins 43, 44 on the extension which lie in slots 45, 46 in the lever arms 41, 42. Adjustable stops 53, 54 in the path of crank levers 39, 40 are arranged so that in the open position, the guide channels 5, 7 and 6, 8 are in alignment. In this embodiment, the links 17 are actuated to move the levers 12, 11 and 39, 40, the links being operated from a tube 55 pivotally mounted in the frame at 56 and having a collar 57 turned by an operating lever 58, an arm 59 at each end of tube 55 being pivotally secured to a link 17 at 60. The lower panel 2 is provided with a finger grip 62 having a lower portion 63 to co-operate with a sealing strip 64 so as to seal in the closed position but allow the horizontal movement of the panel. The guides, link and operating mechanism are all mounted in a framework 65 pivotally mounted at 66 at its upper end to a support 67 so that the panels can be removed when cover plates 68 and 69 have been removed and the framework pivoted in direction of arrow D. Locking means may be incorporated in the operating mechanism and safety means provided to ensure that the panels are in correct position before operation.