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US 4,072,917 AGranted
Switch actuating hinge
AssigneeRixson-Firemark, Inc.
InventorsMichael Haag, Herman P. Pichler
Life of this patent
Estimating the term…
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AssigneeRixson-Firemark, Inc.
InventorsMichael Haag, Herman P. Pichler
Estimating the term…
A pivot hinge comprising a reed switch embedded in the leaf of a nonmagnetic pivot-jamb portion. The reed switch is located in the jamb leaf at an attitude to miss the mounting holes. A round permanent magnet is adjustably mounted on the pivot-door portion perpendicular to the door leaf. When both the door and jamb leaves are together, the magnet is positioned over the reed switch contacts. A threaded, nonmagnetic rod (adjusting screw) with a head the shape of a mounting screw is positioned adjacent the magnet in a mounting hole of the door leaf and retained in position by a retainer ring. The adjusting screw is, in turn, coupled to the magnet with a nonmagnetic link. When the adjusting screw is turned, the magnet can be moved closer to or away from the reed switch in order to actuate the switch with an adjustable sensitivity as indicated by a change in the degree of door opening or closing required to operate the switch.
In a switch actuating hinge in which the hinge has a door leaf and a jamb leaf both having mounting screw holes with each hole adapted to receive the head of an associated mounting screw, the improvement comprising a magnet actuated switch carried by the jamb leaf, a permanent magnet carried by the door leaf, an adjusting screw retained within one of the door leaf mounting holes and having a head substantially identical to that of the mounting screws, and means coupling the adjusting screw to the magnet whereby adjustment of the screw from the exposed face of the door leaf when mounted effects the relative positioning of the magnet and the switch with a resultant change in switch actuating sensitivity.
Dependencies are inferred from the claim text.