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Browse Prior Art Database

Release Mechanism for Spring Loaded Drawer

IP.com Disclosure Number: IPCOM000076912D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Burnham, DW: AUTHOR

Abstract

Described is a release mechanism for a spring loaded drawer, which is under control of an electromagnet and provides isolation from the forces applied to the drawer. The escapement wheel is fixed to a stationary frame and captures the latch bar attached to the spring loaded drawer. The escapement wheel will not rotate in the latched position, since the escapement pawl rests on the positive stop located on the wheel. When the electromagnet is energized, the magnetic field gap closes, thus removing the pawl from the wheel positive stop and the drawer is propelled to the open position by the previously compressed spring. A torsion spring holds the latch wheel in the cocked position.

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Release Mechanism for Spring Loaded Drawer

Described is a release mechanism for a spring loaded drawer, which is under control of an electromagnet and provides isolation from the forces applied to the drawer. The escapement wheel is fixed to a stationary frame and captures the latch bar attached to the spring loaded drawer. The escapement wheel will not rotate in the latched position, since the escapement pawl rests on the positive stop located on the wheel. When the electromagnet is energized, the magnetic field gap closes, thus removing the pawl from the wheel positive stop and the drawer is propelled to the open position by the previously compressed spring. A torsion spring holds the latch wheel in the cocked position. When the drawer is closed, the drawer latch bar engages the escapement wheel and with a camming action rotates the wheel until the pawl drops into the positive stop.

The magnetic field gap is retained independent of the drawer which thus insures quick response to the opening signal. In addition, the latch escapement wheel isolates the electromagnetic device from the drawer forces upon closing of the drawer. A switch, activated by the camming action of the latch escapement wheel, senses the position of the latch mechanism and consequently the drawer position.

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