GB749945A - Lock utilizing interlocking cylinders - Google Patents

Abstract

749,945. Revolving barrel locks; sliding bolts. YALE & TOWNE MANUFACTURING CO. May 4, 1954 [July 9, 1953], No. 12911/54. Class 44. Relates to a lock of the class in which a bolt is adapted to be projected and retracted by a cylinder lock or the equivalent thereof positioned at each side of the lock casing. According to the invention, the lock includes means for securing the cylinders at opposite sides of the lock case, comprising means interlocking the cylinders relative to each other and with the lock case located therebetween, the interlocking means being operable into engaging relation upon relative movement of the cylinders and dogging means for the bolt coacting with the interlocking means. As shown, in which the bolt B of a mortice lock is operable by either of a pair of cylinder locks 36 or 37, the tail of the bolt B is formed with a cavity 22 for a vertically slidable tumbler 17 retained within the cavity by a cover-plate 18. The bolt tail 20 and the cover 18 are provided with notches 31, 32 and 33<SP>1</SP>, 34, for engagement with cam 33 and a cam (not shown) of the key plugs of the lock cylinders 37 and 36 respectively. Extensions 40 and 44 on the lock cylinders engage complementary recesses in the sides of the lock casing and the cylinder 37 is provided with pins 41 which co-operate with a spring-loaded detent 42 by which this cylinder is locked to the cylinder 36. In the retracted position of the bolt B, Fig. 2, two notches 38 on the tumbler 17 are engaged by the pin 41, thus locking the bolt. Rotation of the plug of cylinder 37 anti-clockwise through 360 degrees however, frees the tumbler from the pins 41 and by engagement of cam 33 with notch 31 effects a partial throw of the bolt, the latter being locked in this position by engagement of the central pair of notches 38 in the tumbler 17 with the pin 41. Rotation of the cam 33 through a further 360 degrees projects the bolt to a position corresponding to the engagement of the cam 33 with the notch 32 and the engagement of the pins 41 with the notches 38 at the right-hand end of the tumbler 17. The keyoperated locks 36 and 37 may be replaced by equivalent manually-operated devices, e.g. thumb-turn members. U.S.A. Specification 2,032,758 is referred to.