Patent GB-190310106-A (GB)
Title: Improvements in Locks.
Inventor: MUCHOWICZ KAROF
Filed: 1903-05-04
Granted: 1903-07-30
Abstract: 10,106. Muchowicz, K. May 4. Locks, key, for doors, cupboards, drawers, boxes, &c. Figs. 1 and 2 show a padlock. Tumblers a<1>, a<2>, a<3>, a<4> are mounted on a disc c carried in a cylindrical case b. Each tumbler is formed with a tongue f<1>, f<2>, f<3>, f<4> adapted to engage the eyes of the bow h to secure the same. A key pin d on the disc c projects through holes in the tumblers, the hole in each tumbler being connected by a radial slot with a circumferential slot. A ward m, fixed in the casing, is shaped to correspond with the steps on the key bit, the circumferential slots in the tumblers being formed so as to engage with this ward. When the key is turned to rotate the tumblers and withdraw the tongues from engagement with the bow, the strips of metal left between the central holes and the circumferential slots come over the keyhole and prevent another key from being inserted, or the key in use from being withdrawn until the tumblers are restored to the locking position. This arrangement prevents skeleton keys from being employed to shift the tumblers separately to the locking position. In order that the lock may not be opened by the use of a key with a bit, toe height of which corresponds to the lowest step of the proper key, the holes in some of the tumblers are cut away, so that the bit will be too short to engage the tumblers. A stop limits the movement of the tumblers, or a pawl, adapted to engage notches in the tumblers, may be used for this purpose. Figs. 9 and 10 show another arrangement of padlock in which the key engages projections 25, 26 on the circumferences of the tumblers w<1>, w<2>, w<3>, w<4>, which are mounted on a pin x. Behind the tumblers are pivoted spring-controlled catches y', y', each provided with an arm 21, 22 adapted to engage notches in the tumblers. A ward m is provided to co-act with the key. In withdrawing the tumbler tongues from engagement with the bow h, the catches y<1>, y<2> are first raised out of engagement with the tumbler notches by means of the key, which then acts upon the projections 25 and turns the tumblers out of engagement with one of the bow members, the catches springing back into engagement with the tumblers ; on further turning the key so as to release the catches and engage the projections 26, the tongues may be entirely withdrawn. Spacing discs or plates 27, 29 are arranged between the tumblers and the casing walls. These discs may be so shaped that they are operated by the key and serve, as well as the tumblers, to obstruct the keyhole when the key has been turned to unlock the bow. When applied to a door, box, drawer, &c., the bow may be dispensed with, and the tumbler tongues, which are mounted in a casing fixed to one part, are adapted to engage a recess in the second part to be locked. The casing is provided with a second keyhole, so that the key can be withdrawn after it has been moved to the unlocking position. In a modification, the locking- tongues on the tumblers are dispensed with and teeth on the tumblers engage teeth formed on sliding bolts.