Electromagnetic coil for use in a door holder system

Details Electromagnetic coil for use in a door holder system Electromagnetic coil for use in a door holder system

1995-04-28

1996-10-15

Fleming, Fritz M.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361144, H01F 718

Patent

active

055663761

ABSTRACT:
An electromagnetic coil for use in a doorholder for retaining a door in an open position by magnetic interaction with an armature secured to the door includes a coil of wire for surrounding a core within a cup. A power control circuit including a resistor circuit, controls electrical power supplied to the coil, the power control circuit being mounted on a circuit board situated between the coil rear surface and the cup bottom. The resistor circuit being situated in sufficiently close proximity to the cup bottom for transfer of heat from the resistor circuit to the cup. The power control circuit also includes a low resistance circuit coupled to the resistor circuit, the low resistance circuit including a fusible link, the fusible link being selected to carry current when the power input terminals are coupled to a lower voltage power source and to stop carrying current when the power input terminals are coupled to a higher voltage power source.

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patent: 5139293 (1992-08-01), Zimmerman et al.
patent: 5170322 (1992-12-01), Von Guttenberg

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