Patent GB-663481-A (GB)
Title: Adjustable locking device
IPC: E05F11/00
Filed: 1949-05-25
Abstract: 663,481. Locking levers & rods. DEAL SLIDE-LOCK DEVICES, Inc. May 25, 1949 [Jan. 11, 1949], No. 13949/49. Class 80 (iii) A lock for adjustably retaining a member such as a window sash in position, comprises a number of wedges 4, 5, Fig. 1, movable along a guideway 1, projections 11, 12, connected with, and extending outwardly from, the wedges, means 23, Fig. 2, operatively effective on the wedges to urge them normally into engagement with the guideway with greater resistance to movement in one direction along the guideway than in the opposite direction, and block-like housing 13 having pockets 19, 20, therein to receive the outwardly extending projections 11, 12. In the embodiment shown in Figs. 1 and 2, the window sash is bolted at 14 to the housing 13. The upper pocket 19 communicates with a socket 22 in which a spring 23 is housed bearing at one end against a rotatable plug 26 and at the other against a plug 25 seating on the projection 11. The weight of the window compresses the spring 23 and also forces the wedge 4 against wedge 5 to lock it in position. On pressing downwardly on the window the edge 28 of pocket 20 contacts projection 12 and forces wedge 5 downwardly. Similarly upward force on the window causes edge 29 of pocket 19 to contact projection 11. A flexible ribbon 7 is anchored at its ends to the guideway 1 and passes between the wedges 4, 5 which are pressed together by a flat spring lying between the guideway flanges 8 or, in a modification, by a coil spring mounted in a recess in the housing 13. The central part of housing 13 may be hollow with two solid portions furnishing the surfaces 28, 29, and apertured for receiving the window securing screws. In a modification two springs mounted in sockets in the housing may be used, each of them acting on one of the wedge projections. A connecting spring such as 10 is then not required. The housing in a further modification is eliminated, the pockets 19, 20, and socket 22 being formed in the supported object itself. An adjusting plug, such as 26, for the spring may or may not be provided. As applied to a tripod or the like. Fig. 10, the legs 56, 59, of which are guided by bands 60, a spring 61 is interposed between the lower wedge and an extension 62 of a release member 63, whilst the projections 57, 58, extend into pockets of the rod 56. On moving the release member upwardly or downwardly an edge 65 or 66 of a pair of elongated apertures therein coacts with one of the projections to move the wedges. In the embodiment shown in Fig. 13, adjustment of a rod 84, screw-threaded into a socket 85 of the window, alters the position of a spacer member 82 relative to the projection 87. The force necessary to lower the window which depends upon the extent of compression of the spring 80 and hence on distance X, is thus adjustable. In a modification an adjusting screw acts on the upper limit of a C-shaped member, the lower limb of which constitutes the spacer member similar to 82. An embodiment is described in which a tension spring is utilised, one end of which is adjustably attached to the upper wedge and the lower end fixed to the housing attached to the window. Outstanding wall portions of the housing are adapted to contact the wedge projections when moving the window. Specification 569,723, [Group XXV], and U.S.A. Specifications 2,521,835 and 2,521,836 are referred to.