Patent GB-162329-A (GB)
Title: Improvements in combination locks
IPC: E05B37/00
Filed: 1919-11-29
Abstract: 162,329. Mace, J. J. M. J. Nov. 29, 1919. Locks, permutation.-A combination lock is constructed with obstructor elements each comprising a slotted disc B, Figs. 1 and 2, carrying a disc D with circumferential notches embraced by a ring C, which is internally notched and provided on its circumference with teeth corresponding with dial markings on the face of the casing and with a lug 8. The disc or discs D are freely mounted on, and frictionally gripped between sleeves G feathered on, a central shaft 3 in a casing which in the example shown comprises a padlock constructed with a cylinder 23 screwing into a cylinder 24 and provided with a tongue 25 to engage an apertured lug 26 on a ring 101 pivoted at 100 to the cylinder 24. The notched disc D and ring C are retained in superposed relation by a disc E, and have unequal number of notches for varying the combination, the locking in adjusted position being effected by a key F, Fig. 11, engaging the notches. The cylinder 23 is held in locking engagement with the lug 26 by an arm 21 carried on a pivot 19, and can only be released when the slots 7 in the discs Bare aligned with the arm, which can then be moved by an externally-operated slide 17 carrying pins 18, 106 engaging inclines 109, 107 on the arm. The slots 7 are aligned with the arm for opening in accordance with a secret word by a pointer 102 on the shaft 3 movable over a dial on the end of the cylinder 23, which pointer first brings the lug 8 of the first obstruction element against a stop 9 on an arm 15 pivoted at 10 and then sets the disc B from this position. The pivoted arm 15 is then rocked by an externally-operated slide 14 to lock the stop 9 in the teeth of the ring C. The second obstruction element is then operated in a similar manner in conjunction with another stop corresponding to the stop 9 so as to align the slot with that on the first element already aligned with the arm 21, which can then be operated to release the cylinder 23. The dial has a division corresponding to each tooth on the ring C, and as these exceed in number the letters of the alphabet, the space between the letters on the dial is subdivided, and in setting, the second letter of the code word indicates which subdivision the pointer should be set to in accordance with a table on the dial. A disc A fixed to each disc B is provided with lateral teeth r in the path of a pin m on the arm 21 to prevent rotation of the disc B when the arm is moved for unlocking. As applied to a stationary lock with a bolt in the form of a rack operated by a pinion, the pinion is fixed on a shaft c, Fig. 12, the shaft is slotted and extends through a fixed slotted sleeve d in the casing; and the pivoted arm e controlled by the obstruction elements E has an extension e<1> for engagement with the sleeve and shaft to lock the bolt in projected position. In this position, the arm e locks the screw f connecting the parts of the lock casing. An eccentric g is arranged for locking the arm e or for applying brakes h to the obstruction discs, and where several obstruction discs are employed, stops 9 for arresting the lug 8 on each disc are mounted on springs and after setting each disc in succession are depressed successively to lock the set discs by cams l.