Swinging electromagnetic lock
AssigneeHarrow Products, Inc.
InventorGeorge Frolov
Life of this patent
Estimating the term…
Abstract
A security system, responsive to a threshold force applied to a door, has a lock frame adapted for mounting to a door frame. A housing having an electromagnet mounted thereto swingably mounts to the lock frame. An armature, attractable to the electromagnet, mounts to the door. The housing swings on an axis substantially perpendicular to the door frame header. A pin fixed to the housing extends into the lock frame to limit the swinging of the housing between a first maximum and a second maximum position. A spring disposed between the housing and the lock frame urges the housing toward the first maximum position and sets a threshold force. A microswitch generates a signal upon swinging of the housing relative to the frame when the force of the spring is overcome by a force applied to the door.
Claims20
A security system for a door comprising:
- frame means adapted for mounting a housing means to a door frame, said frame means having a mounting surface;
- electromagnetic means for generating an electromagnetic field and defining an attraction surface;
- said housing means comprising an elongated structure for housing said electromagnetic means, said housing means having a first end portion and a longitudinally spaced second end portion, said attraction surface disposed at one side of said housing means;
- pivot means for pivotally mounting said first end portion of said housing means to said frame means, said pivot means defining a pivot axis substantially perpendicular to said mounting surface and parallel to said attraction surface;
- and
- switch means actuatable in response to pivotal displacement of said housing means relative to said frame means for generating a first electrical signal.
A security system for a door comprising:
- frame means for mounting a housing means to a door frame;
- electromagnetic means for generating an electromagnetic field and defining an attraction surface;
- said housing means having a central longitudinal axis and a first end portion and a longitudinally spaced second end portion for receiving said electromagnetic means;
- pivot means for pivotally mounting said first end portion of said housing means to said frame means;
- said pivot means defining a pivot axis substantially orthogonal to said longitudinal axis;
- switch means actuatable in response to swinging displacement of said housing means from a first angular position to a second angular position for generating a first electrical signal;
- and
- threshold force restricting means for restricting pivotal displacement of said housing means from said first angular position to said second angular position when a force is applied to the housing below a preset threshold.
A security system for a door comprising:
- frame means adapted for mounting a housing means to a door frame, said frame means having a mounting surface;
- electromagnet means comprising an elongated core defining a longitudinal axis for generating an electromagnetic field;
- said housing means for housing said electromagnetic means;
- pivot means for pivotally mounting said housing means to said frame means so that said housing means is swingable along a swing path about a pivot axis orthogonal to said longitudinal axis;
- limiting means for limiting the angular extent of said swing path between a first maximum position and a second maximum position;
- spring means for biasing said housing toward the first maximum position;
- and
- switch means for generating a electrical signal when the housing swings between said first maximum position and said second maximum position.
Dependencies are inferred from the claim text.