Locks – Portable – Fetters
Patent
1975-05-21
1976-12-28
Wolfe, Robert L.
Locks
Portable
Fetters
70 30, E05B 3710, E05B 7300
Patent
active
039994082
ABSTRACT:
A combination lock and a length of steel cable or chain connected with the ends of said lock. The lock comprises a bolt inserted in a casing. A shaft having combined knob and numeral wheel at one end is rotatably disposed in the casing which is provided with a numeral indicating window. Three step wheels, each having a peripheral recess, are loosely mounted on the shaft. The step wheels are provided with a projection or projections on one or both sides for transmitting the movements of the knob. The code number of the lock is composed of three numerals. To unlock, the knob is turned clockwise, until the first numeral of the code number appears in the window, which causes the first step wheel which is farthest from the numeral wheel to be brought to the release position wherein its peripheral recess lies just above the notch provided in the locking bolt; next, the knob is turned counterclockwise until the second numeral of the code number appears two times in the window, whereby the second step wheel is brought to the release position wherein its peripheral recess lies just above the notch of the bolt; finally, the knob is turned again clockwise until the last numeral of the code number appears in the window whereby the third step wheel is brought to the release position wherein its peripheral recess lies just above the corresponding notch of the bolt. Then, as all the step wheels are brought to release position, the bolt may be withdrawn from the casing. According to this invention, a double clip is provided in the casing in order to hold the first and second step wheels immobile against shock or vibration whereby no disturbance of the positions of said step wheels occur during unlocking operation. Further, according to this invention, as the numeral wheel is provided with six radial projections, by varying the relative positions between said projections and the cooperative projection provided on the third step wheel, six different code numbers will be obtained without changing the step wheels.
REFERENCES:
patent: 200617 (1878-02-01), King et al.
patent: 226069 (1880-03-01), Hathaway
patent: 504034 (1893-08-01), Hay
patent: 605493 (1898-06-01), LeVino
patent: 879747 (1908-02-01), Crim et al.
patent: 1468027 (1923-09-01), Lindberg
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