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The dial is connected to an internal mechanism, usually containing three separate wheels with notches, called gates. Each wheel must be aligned to allow a fence to drop into the gates, releasing the lever that holds the lock in place, allowing the lock to open. Generally, this is accomplished by moving the dial to three (or more) positions ...
A worm drive controlling a gate. The position of the gate does not change, once set. In early 20th century automobiles prior to the introduction of power steering, the effect of a flat or blowout on one of the front wheels tended to pull the steering mechanism toward the side with the flat tire. The use of a worm drive reduced this effect.
Padlocks with modular locking mechanisms can often be taken apart to change the tumblers or to service the lock. Modular locking mechanism cylinders frequently employ pin, wafer, and disc tumblers. Padlocks with modular mechanisms are usually automatic, or self-locking (that is, the key is not required to lock the padlock)
A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices: [1] A split beam nut; A castellated nut and a split pin; A hex nut or cap screw and a tab washer
Electric locks use magnets, solenoids, or motors to actuate the lock by either supplying or removing power. Operating the lock can be as simple as using a switch, for example an apartment intercom door release, or as complex as a biometric based access control system. There are two basic types of locks: "preventing mechanism" or operation ...
Their primary distinction is the ability to lock/unlock (and later iterations allow starting) the vehicle without any input from the user. General Motors pioneered this technology with the Passive Keyless Entry (PKE) system in the 1993 Chevrolet Corvette. It featured passive locking/unlocking, but traditional keyed starting of the vehicle.