Patent GB-635546-A (GB)
Title: Improvements in or relating to panel closure members
IPC: E06B3/46
Filed: 1946-03-01
Abstract: 635,546. Sliding doors and windows. HUWS, R. L. March 1, 1946, Nos. 6496 and 27086. [Class 20 (iii)] [Also in Group XIV] A door &c. which opens and closes by movement in its own plane is supported on linkwork which without a lost motion connection imparts an unsymmetrical and slight downward movement as the panel approaches its closed position. Fig. 8 shows a pair of doors each supported by two triangular plates 14, 15 pivoted by one corner to a fixed base member 34 and whose other comers are connected to the door by pivoted links 16 ... 19 ; the arrangement differs from the normal " Roberts " linkage in that the distance between the pivot-points of the links on the plates may be more or less than half the distance between their other pivot-points, the latter may be displaced vertically (e.g., those of links 17, 19 being higher than those of 16, 18) and the plates may be non-isosceles, whereby the form, and the operative part, of the movement curve is varied to give the downward sealing movement at the end of travel in the closing direction. The linkages may be mounted at the top of the door, " reversed " (i.e., the plates being pivoted to the door and the links to the stationary frame) or inverted ; they may be housed between the surfaces of the door, or of the surrounding wall, or may be external thereto extending between either corresponding or adjacent faces thereof ; where they are arranged above the top of a door external to the stationary frame, a housing may be attached to the latter ; Fig. 4 shows duplicated plates 15 and central links 18 pivoted to a fixed channel 20, all housed within an upper framework or wall 26 ; alternatively the links may be duplicated, the central plates passing down to the door through a divided fixed support ; lower guides 25 may be provided, engaging rubbing strips 24 on the door. Double doors may be interconnected by means of a pivoted lever 41 (Fig. 8) linked directly to one plate of each door, or to crank arms 37, 39 thereon ; alternatively the link 16 of one door may be of bell-crank form linked to one arm of another bellcrank turning on a fixed pivot and whose other arm is linked to the plate 14 of the other door ; the first provisional specification describes double doors, both of whose links 16, of bell-crank form, are linked to a common pivot constrained in a fixed vertical slot. The parts may be of metal or laminated plastic material. Fig. 13 shows a two part cupboard door (see Group XIV) hung from cam plates 75, 76 by flexible ties 77, 78 ; the cam plates, of wood, metal, or composition, turn on fixed pivots 64 or in sockets or cradles, and their profile may be circular, or of any other curve giving the required motion ; the ties, which may comprise single lengths attached to the cams at their centres, or separate lengths, may be of rope, cord, webbing, tape, wire rope, steel band or chain, and sharp bending may be avoided by providing fair leads adjacent to, or eye links at, their anchor points ; stretch may be taken up by adjusters in the ties themselves, or by movement of the cam mountings. In a " reversed " and inverted form of this arrangement, the cam plates may be carried in the interior of the door. Stops may be provided to avoid excessive stress in the linkages.