Browse Prior Art Database

Self Restoring Latch Unlatch Mechanism for Logic Controlled Drawer

IP.com Disclosure Number: IPCOM000082400D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Best, JJ: AUTHOR [+2]

Abstract

Shown is a latch/unlatch mechanism designed to automatically unlatch each time a drawer platform reaches the bottom of its travel. The unlatching of the drawer and the stopping of the platform motor occur simultaneously through use of a simple mechanical switch. This latch is also designed to relatch again when the drawer has been pushed shut, regardless of whether the platform position is in its full bottom travel or any other position. This mechanism has the capability to restore itself by driving the platform up approximately 0.125 of an inch or more from the bottom position.

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Self Restoring Latch Unlatch Mechanism for Logic Controlled Drawer

Shown is a latch/unlatch mechanism designed to automatically unlatch each time a drawer platform reaches the bottom of its travel. The unlatching of the drawer and the stopping of the platform motor occur simultaneously through use of a simple mechanical switch. This latch is also designed to relatch again when the drawer has been pushed shut, regardless of whether the platform position is in its full bottom travel or any other position. This mechanism has the capability to restore itself by driving the platform up approximately 0.125 of an inch or more from the bottom position.

At logic command, power is provided to the drawer motor, not shown, to drive the platform down. A contact bar, mounted on the drawer, strikes and rotates the latch release lever. This, in turn, rotates the latch from its locked position or catch. A latch spring loaded against the drawer, which is applying a constant force pulling the latch against the catch, pushes the drawer out approximately 1 inch from its shut position. As the drawer travels out, the contact bar slides off the shelf of the latch release arm mounted on the frame. The drawer may now be either opened fully or shut and relatched.

When the drawer has been pushed shut, the pop-out spring is compressed against the drawer, the latch is allowed to fall over the catch and lock simultaneously transferring the latch switch, and the contact bar deflects back from t...