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A combination padlock. Combination locks do not use keys. Instead, the lock opens when its wheels are lined up correctly to display the correct combination. A padlock was invented by John I. W. Carlson in 1931 (a patent was granted in November 1934) that has both a combination on one side and a key on the other.
A puzzle lock or puzzle padlock is a type of mechanical puzzle. It consists of a lock with unusual or hidden mechanics. Puzzle locks are reconfigurable mechanisms where the topological structure changes during the operation. [1] Such locks are sometimes called trick locks, because there is a trick to opening them which needs to be found. Puzzle ...
Many combination locks have three wheels, but the lock may be equipped with additional wheels, each with a drive pin and fly, in a similar manner. The number of wheels in the mechanism determines the number of specific dial positions that must be entered to open the lock, so a three-sequence combination is required for a three-wheel lock.
The key design is a U-shape profile with six cuts on each side of the key, along with a central roller to activate the trigger pin in the front and center of the cylinder. [ 1 ] In order for the lock to operate, the key must be fully inserted, allowing the dual sidebars to enter the pins, provided the pins were raised to the correct height ...
The lock company, Slaymaker, Barry and Company, was founded in 1888 by Samuel R. Slaymaker and John F. Barry of Connellsville, Pennsylvania.Samuel Slaymaker had become interested in switch and signal locks while working for the Pennsylvania Railroad as a civil engineer.
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