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A lock bolt with two parts which can be moved in opposite directions.



Related Terms

DIFFERENTIAL FREQUENCY METER

A circuit that converts the absolute frequency difference between two input signals to a linearly proportional direct-current output voltage that can be used to drive a meter, recorder, oscilloscope, or other device.

DEAD BOLT

A lock bolt that is moved directly by the turning of a knob or key, not by spring action.

COEFFICIENT OF RESTITUTION

The constant e, which is the ratio of the relative velocity of two elastic spheres after direct impact to that before impact; e can vary from 0 to 1, with 1 equivalent to an elastic collision and 0 equivalent to a perfectly elastic collision. Also known as restitution coefficient.

FORKLIFT

A machine, usually powered by hydraulic means, consisting of two or more prongs which can be raised and lowered and are inserted under heavy materials or objects for hoisting and moving them.

DUPLEX LOCK

A lock with two independent pin-tumbler cylinders on the same bolt.

COMBINATION LOCK

A lock that can be opened only when its dial has been set to the proper combination of symbols, in the proper sequence.

BOLTED JOINT

The assembly of two or more parts by a threaded bolt and nut or by a screw that passes through one member and threads into another.

COUPLED CIRCUITS

Two or more electric circuits so arranged that energy can transfer electrically or magnetically from one to another.

DYNAMICAL SIMILARITY

Two flow fields are dynamically similar if one can be transformed into the other by a change of length and velocity scales. All dimensionless numbers of the flows must be the same.

GUARD LOCK

  1. See entrance lock. 2. An auxiliary lock that must be opened before the key can be turned in a main lock.

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