GB522385A - Improvements relating to locking systems - Google Patents

Abstract

522,385. Locks. FUTRAN, S. Dec. 7, 1938, No. 35681. Convention date, Dec. 10, 1937. [Class 44] On a rotary cylinder 2 there are positioned a number of rotary locking discs 4 each recessed at 6, 7, 7<1>. Spacing partitions separate the discs which are held against frictional rotation by spring-presse d pivotal pawls 9. A shaft 14 carries an oscillable feeler 15, 16 and also a hook 18, 19 which may be brought into the path of pins 20, 20<1> on a disc 21 keyed to the cylinder 2. In the zero position, Fig. 6, the feeler 16 engages in a line of recesses 6 thus rocking the hook 19 away from the pins 20, 20<1>. On inserting a key 27 and turning the same, certain discs 4 are turned whilst those opposite notches 28<1> remain in normal position. Due to the movement of certain discs 4 the feeler 16 is raised thereby bringing the hook 19 into the path of the pins 20, 20<1>. After 180‹ turn the key may be removed, leaving a certain locking combination of discs. This combination can only be operated to unlock the cylinder 2, and thence actuate the bolt-operating member 10, by a key similar to that first used, which will move either recesses 7 or 7<1> into line with recesses 6 in the discs not moved, for either direction of rotation and independent of the number of rotations, to bring about the unlocking action, Spring- pressed pips 22, 23 engage with notch 30 in the key to enable'the cylinder 2 to be turned and notches 29, 29<1> co-operate with a projection 31. on the key allowing insertion only at those two points. A removable screw may be provided over notch 291.