Locks – Operating mechanism – Using a powered device
Patent
1993-01-05
1995-01-03
Cuomo, Peter M.
Locks
Operating mechanism
Using a powered device
70277, E05B 4700
Patent
active
053775139
ABSTRACT:
To assure that door locking can reliably be achieved, two permanent magnets are arranged for a locking device. One of the permanent magnets, i.e., a first permanent magnet is carried on one end of a trigger member of which central part is turnably supported in a lock box, while the other one, i.e., a second permanent magnet is disposed on a door frame at the position located in alignment with the first permanent magnet when a door is closed. The magnetic pole of the first permanent magnet is coincident with that of the second permanent magnet. When the door is closed, the first permanent magnet is displaced away from the second permanent magnet by the magnetic repulsive force appearing between both the permanent magnets, causing the trigger member to be disengaged from an engagement lever made integral with a control gear, resulting in the dead bolt becoming operatively free. Thus, the dead bolt is displaced in the forward direction by the resilient force of spring means to project outside of a front plate until the foremost end of the dead bolt is inserted into a dead bolt insert hole formed on an opponent door frame. On the contrary, when the door is opened, a knob is actuated to turn the retractor, causing the dead bolt to be retracted to an unlocked position via engagement of the retractor with the dead bolt. Alternatively, the magnetic pole of the first permanent magnet may be coincident with that of the second permanent magnet. In this case, a magnetic attractive force appears between both the permanent magnets.
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Akihiko Imai
Miyamoto Kinji
Cuomo Peter M.
Dino Suzanne L.
Miwa Lock Kabushiki Kaisha
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