Browse Prior Art Database

TWO-STEP FORCE LATCH

IP.com Disclosure Number: IPCOM000023920D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 224K

Publishing Venue

Xerox Disclosure Journal

Abstract

An electromagnetic door-holdingdevice for photocopying machines includes an electromagnet mounted in a housing unit as the latch in combination with a steel striker plate to complete a circuit, The striker plate is mounted in the door and in-line with the electromagnet when the door is closed.

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XEROX DISCLOSURE JOURNAL

TWO~STEPFORCE LATCH Proposed Classification Eugene P. Ritter U.S. Cl. 292/251.5
mt. Cl. E05c 17/56

An electromagnetic door~-holdingdevice for photocopying machines includes an electromagnet mounted in a housing unit as the latch in combination with a steel striker plate to complete a circuit, The striker plate is mounted in the door and in~ line with the electromagnet when the door is closed.

When the main power switch is turned on, the electromagnetic holding force is sufficient to hold the door closed against the force of gravity; however, an operator will still be capable of opening the door by using slight force. When the "start~ print" button is enabled, the electromagnetic force is then increased to become a sufficiently large enough force to prevent the machine operator from opening the door.

At the end~of~run,jam or power failure, the electromagnetic source is de~ energized thereby allowing the door to automatically be opened by the force of gravity.

Volume 4 Number 2 March/April 1979 217

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