| 摘要 |
A locking system for a dead bolt and slam bolt locking of a movable door to a stationary keeper comprises a lock housing defining a cylinder chamber having an opening alignable with a keeper recess in the closed position of the door. A spherical locking bolt is mounted on a piston which is slidably and sealably movable in the cylinder chamber between an inner non-locking position and an outer locking position. The interior of the cylinder chamber is filled with a non-compressible fluid by outward movement of the piston and a normally closed check valve prevents exhaust of such fluid to produce a dead lock conditon. The check valve is alternatively opened by a manual key or by remotely controlled energization of a solenoid.
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