Patent GB-742495-A (GB)
Title: Improvements in or relating to door lock set
IPC: E05B55/00
Filed: 1953-05-13
Abstract: 742,495. Locks. CARTER, V. M. May 13, 1953 [May 24, 1952], No. 13352/53. Class 44. A door lock set having a knob and a pin tumbler lock in the knob comprising a cylinder non- rotatably mounted in the knob and an axially disposed plug rotatably mounted in the cylinder, is provided with means for adjusting the plug and cylinder lengthwise relative to each other, comprising a member disposed about the plug and in endwise engagement with the cylinder, and an endwise adjustable variable connection between the member and the plug adapted to shift the plug relative to the cylinder. The do or lock set, Figs. 1 and 2, includes a spindle housing 12 mounted within a door recess 11 an d formed by a cylindrical core 15 surrounded by a shell 16 having a hub 17, which shell 16 is surrounded by a shell 18 having a hub 20. The shells 16, 18, Fig. 5, are relatively rotatable so as to secure a latch housing 13 in a door recess 14 and in apertures 22, 21, respectively formed in the shells. The housing 12 is secured in the recess 11 by sleeves 25 and screws 26 coacting with mounting plates 23, 24 provided with covers 28, 27. Inside and outside hollow latch operating spindles 32, 44 are rotatably secured to the housing 12 as by shoulders 35, 61, on the inner ends of the spindles abutting the inside end walls of the core 15. Door knobs 30, 62 are detachably secured to the spindles 32, 44, respectively, as by their shanks 31, 63 engaging with spring pressure detents 33, 64, respectively, mounted in the spindles. The inner ends of the spindles within the core 15 are approximately semi-cylindrical in shape to form followers for acting directly on the latch slidable in the housing 13. A privacy latch 36 is mounted for longitudinal sliding movement within the inside door spindle 32 and comprises a pair of levers 38 and 37 pivoted together at 39.' The lever 38 passes through a slot 40 in one wall of the core 15, and has an off-set portion 41 which passes through a slot 42 in the opposite wall of the core 15. When the lever 38 is moved to the left in Fig. 1, the off-set engages in a slot 43 in the outside spindle 44 to lock it against rotation. The privacy latch 36 is moved to its inoperative position by a spring 52. When a push-button 45, in the knob 30 and spindle 32, is depressed, the latch 36 is moved to the left to lock the spindle 44 and is retained in the locking position by a shoulder 53, on the lever 37 and, urged by a spring 56, locking behind spindle 32. The latch may be released by turning the knob 30 and thus the spindle 32 and ring 55 to release the shoulder 53 from the shoulder 54, whereafter the latch is returned to the right by the spring 52. In order to facilitate opening the door from the outside when the privacy latch is operative a cylinder lock is mounted in the outside knob 62 and spindle 44. The cylinder 70 of this lock has a boss 71 which engages in a slot in the spindle 44 to prevent relative rotation therebetween. The boss is provided with pin tumbler recesses 76 housing springs 80 for driver pins 78 all of equal length which engage driven pins 79, of different lengths, slidable in recesses 77 in the lock plug 67. The tumblers and springs are retained in position by a cap member 81, extending over the outer ends of the cylinder recesses, and securable to the ends of the boss 71 at 82. The plug 67 at its inner end is non-rotatably but slidably secured to a sleeve member 90 extending through the spindle 44 and formed at its inner end, within the core 15, with a latch operating extension 91 of approximately semi-cylindrical form similar to the inner end of the spindle 44. Clearly, by inserting a key 75 in the cylinder lock, the plug 67 and extension 91 may be rotated relative to the spindle 44 when latched by the off-set 41, whereby the door latch proper may be actuated. In order to accurately align the tumbler recesses 76, 77, an adjusting screw 98 having self-cutting threads extends freely through an aperture 99 in a wall 92 of the sleeve 90 and is adapted to be threaded into a bore 100 in the plug 67, a spring 101 being positioned between the wall 92 and the end of the plug 67. When the pin tumbler lock is assembled, the plug is inserted in the cylinder until a bearing flange 66 of the plug bears lightly or with slight clearance, and rotatably, against an internal flange of a cap member 65 of the knob 62. The screw 98 is then inserted through the wall 92 and the spring 101 positioned thereover. On tightening the screw into the bore 100 the edge 96 of the sleeve 90 engages with the end of the cylinder 70. Further rotation of the screw draws the plug 67 to the right in Fig. 1 (Fig. 1, however, depicts the plug at the limit of its adjustment) such movement being permitted owing to the clearance between the flange 66 and the internal flange of the cap 65. The adjustment is effected until the recesses 76, 77 are aligned. The recesses remain aligned owing to the tightness of the screw threads in the bore 100 and the action of the spring 101.