Browse Prior Art Database

Key Latch for Data Door of Data Processor Enclosure With Lock-Open and Lock-Closed Positions

IP.com Disclosure Number: IPCOM000039186D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Gallagher, RM: AUTHOR [+2]

Abstract

An improved key latch mechanism is provided for a processor enclosure door of the type that has two latches that engage slots in the processor frame along the upper and lower edges of the door when the door is locked closed. The key latch mechanism is located midway between the upper and lower edges, and it carries two conventional crank arms that are linked to the latches by wires to pull the latches open when the key is turned. The key latch mechanism has a rotatable tumbler and a carrier that is attached to the door. A hex-shaped slot is formed on the axis of the tumbler, and a hex-shaped key is inserted into the slot to turn the tumbler. The rotatable tumbler has an arculate slot, and a spring-loaded pin is mounted on the carrier to ride in the slot.

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Key Latch for Data Door of Data Processor Enclosure With Lock-Open and Lock-Closed Positions

An improved key latch mechanism is provided for a processor enclosure door of the type that has two latches that engage slots in the processor frame along the upper and lower edges of the door when the door is locked closed. The key latch mechanism is located midway between the upper and lower edges, and it carries two conventional crank arms that are linked to the latches by wires to pull the latches open when the key is turned. The key latch mechanism has a rotatable tumbler and a carrier that is attached to the door. A hex-shaped slot is formed on the axis of the tumbler, and a hex-shaped key is inserted into the slot to turn the tumbler. The rotatable tumbler has an arculate slot, and a spring-loaded pin is mounted on the carrier to ride in the slot. The slot has an arc of about 90 degrees, and the handle can be rotated only far enough for one of the radial edges of the slot to strike the pin. At the ends of the arc, the bottom of the slot is open to the hex keyway, and the pin enters this opening to hold the tumbler in a lock-open or a lock-closed position. When the hex key is inserted into the axial slot, it cams the pin out of the opening to permit the tumbler to turn. The floor of the slot between the two locking positions is shaped for the spring- loaded pin to cam the tumbler into the nearest locking position.

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