Patent GB-188028-A (GB)
Title: A mechanical fastener for window sashes and the like
IPC: E05F11/00
Filed: 1921-07-23
Abstract: 188,028. Williams, G. H. July 23, 1921. Sliding bolts; locks, permutation.-A fastener for windows and the like comprises a bolt d sliding in a cylindrical casing y secured on one sash and adapted to be engaged against the action of its spring k in a socket a mounted in a cylindrical casing x on the other sash, a lever f, pivoted at f<4> to the casing y, when swung inwards into the position shown, acting on the follower e so as to cause the wheel e thereon to leave a groove in the end of the bolt d and cause the wheel e<2> to engage in the groove to force the bolt d into the socket a. The lever f is provided with a pin f<3> adapted to engage in a slot d' in the bolt d to retain the latter in its shot position and with a catch member f<1> adapted to enter a slot in the casing x and engage over a projection c<2> formed by a slot c<3> in the body of a plunger c mounted in the casing x and pressed outwardly by a spring k' mounted on an extension of the socket a. Codelock mechanism comprising two or more checks H, H<2> mounted on the reduced extension of the plunger c is adapted to be disarranged so as to prevent the plunger c being pressed in to release the fastener. To unfasten the window, the codelock mechanism is set so as to allow the projection c' on the plunger c to pass when the latter is pressed in to clear the projection c' from the catch member f<1>. When this occurs the lever f is swung outwardly by the bolt d being pressed back by its spring k, the slot d' in the bolt being cut away, as shown, to force the pin f<3> outwardly, the follower e, acted on by the bolt d in its backward movement, also assisting to force the lever f outwardly. Figs. 6, 7, and 9 show the construction of the code-lock mechanism when only two checks are employed. The front check H is provided with an annular recess H in which the projection c' on the plunger c is normally situated and also has a number of radial slots, only one of which, H<6>, allows the projection c<1> to pass. The other check H<2>, provided with similar radial slots in its bevelled face, is mounted on the barrel of the check H and prevented from relative longitudinal movement by a screw passing through the check H<2> into the annular groove H<1> in the barrel of the check H, a light spiral spring being interposed between the front of the check H<2> and the back of the enlarged part of the check H. The checks are then mounted on the reduced extension of the plunger c with the projection c<1> in the recess H<6> and secured against longitudinal movement by a screw passing through the casing x into the annular groove H<1> in the check H<2>. Each check carries a number of markings one of which is the code mark for that check, which, when brought opposite a marking on the casing x, indicates that the slot H<5> is in alignment with the projections c<1> so as to allow the plunger c to be pressed inwardly. When more than two checks are employed, Fig. 12, a projection c<1> is provided on the plunger c, Fig. 11, for each check employed and the checks H, H<2>, and additional checks H' are formed, as shown in Figs. 14, 15, and 16 respectively. Annular recesses H<9> are formed in the checks to accommodate the projections c<1> and radial slots similar to those already described are formed in the parts H<10> to the rear of the recesses H<9>. The checks H<7> are inserted in a slot in the extended casing x, Fig. 12, and the extension of the plunger c passed through them, the projections c<1> being guided through the slots H'. The checks H, H<2> are then assembled on the plunger c in a similar manner to that previously described.