Adjustable door hinge monitoring device

Details Adjustable door hinge monitoring device Adjustable door hinge monitoring device

2001-05-01

2003-06-10

Wu, Daniel J. (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S545100, C340S545300, C340S551000, C340S572400, C340S572600, C335S153000, C335S205000, C335S207000

Reexamination Certificate

active

06577235

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to hinges, especially piano type hinges which are used to mount a swinging door to a fixed door frame. Such doors may be made of any suitable material, such as wood, plastic, or metal, and the hinges may be made of any appropriate material, including plastic or metal, such as aluminum, steel or brass.
More particularly, the invention is in a magnetic device for monitoring the opening and closing of a door as it swings to and from a closed position in a fixed door frame to which the door is mounted.


REFERENCES:
patent: 4072917 (1978-02-01), Haag et al.
patent: 4213110 (1980-07-01), Holce
patent: 4292629 (1981-09-01), Kerr et al.

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