A magnetic lock is disclosed to include a latch for locking, a holder member supported on a spring and carrying an electromagnetic valve, which has a reciprocating rod fixedly mounted with a stop block for controlling the retraction of the latch, and an adjustment screw for controlling the holder member between a first position where the magnetic lock is locked when electrically connected and a second position where the magnetic lock is unlocked when electrically connected.
1. A magnetic lock comprising:
a bottom cover shell;
a top cover shell fastened to said bottom cover shell;
a latch mounted inside said top cover shell;
an electromagnetic valve, said electromagnetic valve having a reciprocating rod, a stop block being mounted on said reciprocating rod, said stop block being linearly displaceable responsive to displacement of said reciprocating rod;
a movable holder member carrying said electromagnetic valve and being movably mounted inside said top cover shell and adapted to control the return stroke of said latch;
wherein said movable holder member has one end supported on a compression spring inside said top cover shell and an opposite end stopped against an adjustment screw, said adjustment screw being mounted in one side of said top cover shell and kept in axial alignment with said movable holder member and said compression spring on a moving axis X-X;
wherein when said adjustment screw is tightened the stop block does not hinder movement of the latch when the electromagnetic valve is energized, and when said adjustment screw is loosened the stop block prevents movement of the latch when the electromagnetic valve is energized.
2. The magnetic lock as claimed in claim 1 , wherein said reciprocating rod is a threaded rod; said stop block is a U-shaped member screwed onto said threaded rod.