Patent GB-190212261-A (GB)
Title: Improvements in or connected with Locks and Keys.
Inventor: GUMILEVSKY GABRIEL
Filed: 1902-05-29
Granted: 1902-09-04
Abstract: 12,261. Gumilevsky, G. May 29. Locks, key; keys.-Relates to means for indicating the operation of a lock, and the use of the key. Fig. 1 shows indicating-mechanism applied to a lock. On the bolt 2 is pivoted a spring- controlled pawl 5, which gears with a ratchetwheel 3 mounted to rotate in the casing. A dial 11 on the ratchet-wheel is provided with letters, signs, or numerals, which pass successively behind an opening in the casing, when the wheel is rotated. Another ratchet - wheel 13, provided with a similarly-marked dial 16, is moved round the distance of one tooth for every revolution of the wheel 3 by means of a pin secured to this wheel. Backward movements of the wheels 3, 13 are prevented by spring-controlled retaining- pawls 8, 15. Each time the bolt 2 is retracted and then shot again, the pawl 5 turns the wheel 3 through the space of one tooth, so as to expose a fresh letter &c. at the opening in the casing, and thereby indicate the operation of the lock. At every revolution of the wheel 3, the wheel 13 is turned so as to expose a fresh letter &c. at the opening provided for the dial 16. Figs. 3 and 5 show the mechanism for indicating the use of the key. Within the hollow stem 20 of the key is mounted a spindle 21 carrying pins adapted to engage with teeth on sector 26, pivoted in a casing 19 attached to the stem and working between stops 28. A pawl 35 on the sector engages a ratchet-wheel 30, carrying a disc provided with letters &c. arranged to move behind an opening in the casing. A pawl 36 prevents backward rotation of the wheel 30. Another ratchet - wheel 31, having teeth oppositely arranged to those on the wheel 30, has a frictional engagement with the wheel 30 by means of a spring 38. Movement of the wheel 31 is prevented by the engagement of a pawl 37, except once during a revolution of the wheel 30, when a finger on the wheel 30 lifts the pawl and allows the wheel 31 to move through the space of one tooth, thereby exposing a fresh letter &c. at the opening provided for the dial fixed to this wheel. Upon inserting the key in the lock, a recess engages a pin 24, Fig. 1, in the keyhole, and causes the pawl 35 to move the wheel 30, when the key is turned to the unlocking and then to the locking position. This movement of the wheel exposes a fresh letter &c. at the opening, and at every revolution the wheel 31 is advanced one tooth to expose a fresh letter &c. at the corresponding opening. Should the recording-mechanism of the lock be restored to its original position by continuous operation, a sealing-device may ba employed to indicate this. On the spindle of the dial 16, Fig. 1, a plate having a cam projection is mounted, and a bar pivoted on this spindle is sealed to the lock casing by wax, stamped or marked paper, &c. When the dial has made a revolution, the cam on the plate will come underneath the bar and act as a wedge to break the seal. A greater number of ratchet-wheels than two may be employed. The dials may be fixed, and the indications made by index fingers, operated by ratchet-wheels &c. and arranged like the hands of a clock.