Electricity: magnetically operated switches – magnets – and electr – Permanent magnet-actuated switches
Patent
1994-01-31
1995-05-16
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Permanent magnet-actuated switches
335206, H01H 900
Patent
active
054164567
ABSTRACT:
Apparatus for detecting the opened and closed state of a window as a component of a home security system comprising of a window having a peripheral frame defining an opening with a lower sill having a free upper surface thereof and an associated window slidable within the opening between an upper open orientation and a lower closed orientation, the window having a free lower surface adaptable to be in operative contact with the upper surface of the sill when the window is closed. A magnetically responsive switch secured with respect to the upper surface of the sill, the switch having a moveable component and a fixed component with a pair of electrical leads, one of the leads electrically coupled between the fixed component and the other lead electrically coupled to the moveable component, the moveable component being in an orientation out of contact with the fixed component when the window is opened but moveable under the influence of a magnetic force into contact with the fixed component when the window is closed, the fixed and moveable components being formed of electrically conductive material whereby when moved into contact one with another an electrical circuit will be closed to send a signal that the window is closed but when moved out of contact one with another an electrical circuit will be opened to send a signal that the window is opened. A moveable switch actuator formed as a magnet secured to the lower surface of the window with securement means to secure the magnet in position to the lower surface of the window whereby when the window was opened the magnetic field is removed from the switch but when the window is closed the magnet will, magnetically raise the second component of the switch into contact with the first component of the switch, the securement means including regions coupled to the bottom of the window and regions for holding the exterior surface of the magnet in an appropriate orientation with respect to the bottom of the window and the sill.
REFERENCES:
patent: 4292629 (1981-09-01), Kerr et al.
patent: 4700163 (1987-10-01), Wolfe, Jr.
patent: 4999599 (1991-03-01), Spier
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