Patent GB-391482-A (GB)
Title: Improvements in or relating to locking devices
IPC: E05B27/10
Filed: 1931-10-24
Abstract: 391,482. Door &c. locks. LEJBOWICZ, F. J., Wolnosci, 7, Krolewska Huta U1, Poland. Oct. 24, 1931, No. 29537. [Class 44.] Lock mechanism released by insertion of a key 40, Fig. 18, having bits 41 (separately adjustable) of different lengths comprises a pair of plates 4, 22 biased apart by a spring 33, in which position they are normally held positively by distance-pieces. The distance-pieces comprise a number of rotatable discs 6 on plate 4 (five shown) each having an aperture 7, and a corresponding number of rotatable discs 26 on plate 22, each having a pin 32 which normally bears against the face of corresponding disc 6 to retain plates 4, 22 apart. Insertion of the proper key rotates discs 6 to bring the apertures 7 therein into registration with the corresponding pins 32, so that by pressure on the key plate 4 can be moved bodily towards plate 22, the pins 32 entering the apertures 7. Both plates 4, 22 are rotatable. Plate 4 has peripheral projections 5 which, when the plates are in normal separated position, engage against one edge or the other of step projections 2 on the inner face of the front plate 1 of the lock casing, thus preventing rotation of plate 4 and locking the bolt in shot or retracted position. When the proper key has been inserted and pressed home, moving plate 4 away from plate 1 and towards plate 22, projections 2, 5 are disengaged and plate 4 can then be rotated by the key. Plate 22 is rotated by plate 4 through the pin-andaperture coupling 7, 32 established by the use of the key, and has a radial arm 23 having pin-and-slot connection 24 with the sliding bolt 25. Tubular guides 9 corresponding with the discs 6 have parallel portions in a cylindrical case 3 which receive the key bits 41 through apertures 12 in a keyhole disc 11, and outwardly bent inner portions radially fixed to plate 4. Insertion of the key displaces balls 10 in the guides 9, the innermost ball in each guide bearing against a corresponding arm 16 pivoted to plate 4 and extending through a slot 15 in the guide. Each arm 16 has a slot 18 engaged by a pin 19 on the back of corresponding disc 6, pin 19 extending through an arcuate slot 20 in plate 4. Insertion of the key thus displaces arms 16 and rotates discs 6 to register pins 32 and apertures 7, the extent of each displacement depending on the length of the corresponding bit 41. Arms 16 and discs 6 are biased to normal position by springs 21. Discs 26 are normally prevented from rotating by spring pins (not shown), released by the displacement of plate 4. The lock shown in Fig. 12 is arranged for key-operation from one side, and has a knob 36 at the other side by which plate 22 and bolt 25 may be directly hand-operated. Knob 36 is normally held locked by a spring catch 37 released by a press-button 39 for hand-operation, and released to allow key-operation by a stem 14 carried by plate 4 which releases the catch when plate 4 is displaced towards plate 22. In a modification, Fig. 19, the plates 4, 22 are not rotatable, the bolt being operated by a pivoted arm 43 shown separate, Fig. 22. This arm carries the projections 2 co-operating with projections (not shown) on plate 4, to hold the arm against rotation, and released on displacement of the plate. The guides 9 surround the peripheries of discs 6 which have radial projections 45 projecting directly into the guides through slots. The innermost ball 10 in each guide bears against one side of projection 45, and the biasing spring 21 is housed in the guide and bears against the other side of projection 45. With this form of lock the key has a bit-carrying part which is pressed home to displace plate 4 and is there retained by a releasable spring catch whilst the arm 43 is rotated to operate the bolt by a knob-operated spindle mounted in the key, the inner end of the spindle engaging a slot 49 in the pivot-pin of arm 43.