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Lavet-type stepping motor of a quartz clock. A black rotor sprocket provides the mechanical output. The Lavet-type stepping motor has widespread use as a drive in electro-mechanical clocks [1] and is a special kind of single-phase stepping motor. Both analog and stepped-movement quartz clocks use the Lavet-type stepping motor (see Quartz clock).
Modern time delay combination locks can have many functions such as multiple different codes, pre-set time lock settings (open and close times), pre-set vacation times (e.g. Christmas Day), dual code facility, and a full audit trail providing a detailed record of the lock history showing who opened the lock, when and how long it was open. [3] [4]
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 ...
The keys for warded locks only require the back end manipulating which is the end which opens the lock. The other parts are there to distinguish between different varieties of their locks. For example, for a chest of drawers with a warded lock, a skeleton key for that type of warded lock can be made by filing away all but the last one or two ...
To rekey a lock you have to first remove the lock cylinder from any housing it rests in. The lock cylinder must be disassembled, and the plug removed. Use a plug follower to avoid dropping master-wafers, top pins and springs. The plug has cylindrical chambers spaced according to manufacturer specifications.
Unibit may refer to: Unibit (drill bit), a roughly conical drill bit with a stairstep profile; Unibit (unit), 1 bit of information; Unibit PLL, a type of phase-locked ...
The most grievous flaw in the design is inherent in the modern construction of steering wheels; thieves can defeat this type of lock by making a cut through the steering wheel's outer rim, allowing the device to be removed. This does, however, require access to a hacksaw or other cutting tool, and ruins the steering wheel.
Locks have been constructed for over 2500 years, initially out of wood and later out of metal. [1] Historically, locksmiths would make the entire lock, working for hours hand cutting screws and doing much file-work. Lock designs became significantly more complicated in the 18th century, and locksmiths often specialized in repairing or designing ...