Patent GB-192960-A (GB)
Title: Improvements in permutation locks
IPC: E05B37/00
Filed: 1922-03-25
Abstract: 192,960. MacÚ, J. March 25, 1922. Locks, permutation; cases for.-Relates to improvements in a lock of the type described in Specification 109,450 in which concentric discs carrying permutation elements in staggered relationship mounted in a band and rotated by frictional engagement with a spindle, are rotated to bring aligned notches opposite abutments when the discs can be bodily slid to operate a plate carrying the bolt, the discs being given an up-and-down movement at correct stages in their rotation, to avoid disaligning their notches by contact between a stop and the permutation elements. The invention consists in adapting the stop to be moved to avoid contact with the permutation elements, providing a readily removable band for replacement by a barrel having discs with differently arranged permutation elements secured by a cover-plate which can only be screwed off when the bolt is is the inoperative position, and means on the barrel-operating pinion for removing the stop from the path of the permutation elements when the discs are being set to their zero position. The flanged discs 3, 6 are concentrically mounted in the barrel 2 fixed to a spindle 1 rotating in bearings in the casing 14 and the coverplate. The discs 3 and 6 have permutation elements 11, 11<b> and 11<a>, 11<c> respectively, fixed to their opposing faces by washers. Those 11 have inwardly flanged bent parts ending in shoulders 65, and those 11<a> have projecting shoulders 67. Those 11<b> and 11<c> are plain and place the shouldered elements in staggered relationship as shown in Fig. 1. To operate the lock the handle 57 is turned to the right causing a barrel 22, slidably connected to the handle by a flat arm entering a pair of jaws, to rotate and travel towards the handle by means of a spiral slot 23 in it travelling on a pin 24 on the sleeve 19. By the time the pin reaches the end of the slot a flange 25 in the barrel has engaged a flange 26 on an arm 28 carrying the stop element 29 and moved it on the spindle 31 until the arm 28 is in contact with the wall 35 of the casing. This withdraws the stop 29 from its position between the shoulders of the elements 11, 11<a>. Further rotation of the knob 57 to the left rotates the barrel 2 in a counter-clockwise direction by means of the pinion 20 on the sleeve 19, carrying with it the discs 3 and 6 which are stopped when stop pins 5 and 8 on them engage pawls 55, 56, the discs being frictionally turned by the shaft 1 by reason of the spring 9, but capable of being arrested while the shaft still turns. In this position, the notches 4 and 7 respectively in the flanges of the discs are aligned and the knob 57 is turned to the left to rotate the barrel 2 and the discs in a clockwise direction in order to bring the aligned notches opposite abutments on the arm of a pivoted lever 37 to allow operation of the bolt. The reversal of the direction of rotation of the knob 57 causes the barrel 22 to travel away from the knob, by reason of the pin 24 and slot 23, releasing the flange 26 and allowing a spring 30 to re-position the stop element 29 between the shoulders 65, 67 of the elements 11, 11<a>. As the rotation of the knob continues, turning the barrel and the discs in a clockwise direction, it becomes necessary to manipulate the stop 29 in order to avoid its engagement with the shoulders of the elements 11, 11<a> which would arrest one or other of the discs and disalign the notches. This is done by turning the eccentric 33 on the shaft 34, which co-operates with a pair of blade springs 32 to rock the arm 28 carrying the stop, the stop being successively moved out of the path of the shoulders on the elements 11 and 11<a>. The correct times at which to move the stop are ascertained by counting clicks caused by camteeth 69 on the sleeve 19 carrying the pinion 20 and resiliently mounted by the spring 21 on the fixed shaft 17 wiping over corresponding teeth 70 on the fixed shaft. The pinion and band are sogeared and the number of teeth 69, 70 so arranged that one click indicates the angular movement of one element 11 to the position occupied previously by the adjacent one. When the notches 4, 7 have been brought by this means into line with the bent arm of the lever 37, abutments 38, 39 are free to pass through them. By now turning the knob 57a a cam-sector 44 on it displaces a blade spring 40 rigidly secured to the pivot 43 of the lever 37, causing the lever to move over to the left, its bent arm travelling towards the shaft 1, removing a shoulder 47 on the lever from the path of a second cam-sector 46, and allowing complete rotation of the shaft 45 to operate the bolt. A spring 42 automatically returns the lever 37 to its position for being locked by the discs 3 and 6. The removable cover plate which screws into a recess 75 in the casing, has a spring plate pressed upon the face of the barrel 2 to control its rotation, and has also a lug 53 engaged by the bent arm 51 of a lever 52 pivoted to the casing at 50, to prevent unscrewing. When the bolt is operated by turning the shaft 45, an arm 48 engages_an arm 49 on the lever 52, rocking the arm 51 out of the path of the lug 53 and allowing the cover plate to be screwed off. The nuts 74 securing the casing 14 to the door by screwing in bolts 54 can only be removed when the cover-plate is off. The handle connections between the shaft 48 and sleeve 22 allow of adjustment for the varying thickness of doors. Specification 162,329 is referred to.