Browse Prior Art Database

Low Profile Mechanical/Electrical Lock Assembly

IP.com Disclosure Number: IPCOM000047801D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Davis, TH: AUTHOR [+2]

Abstract

A standard key-operated lock assembly is modified so as to provide physical and electrical security for a densely packaged computer system. An exploded view of this modified assembly is given in Fig. 1, and the relationship between the assembly and a cover element secured by it is indicated in Fig. 2. Referring to these figures, conventional lock cylinder 1, held fastened to panel 2 by lock washer 1a and lock nut 1b, has a truncated shaft 3 to which an offset cam 4 and a switch-operating cam 5 are fastened by lock nut and washer pair 6.

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Low Profile Mechanical/Electrical Lock Assembly

A standard key-operated lock assembly is modified so as to provide physical and electrical security for a densely packaged computer system. An exploded view of this modified assembly is given in Fig. 1, and the relationship between the assembly and a cover element secured by it is indicated in Fig. 2. Referring to these figures, conventional lock cylinder 1, held fastened to panel 2 by lock washer 1a and lock nut 1b, has a truncated shaft 3 to which an offset cam 4 and a switch-operating cam 5 are fastened by lock nut and washer pair 6. Panel 2 is fastened to the chassis of a computer system housing (not shown) which contains a dense configuration of electronic and electrical components, leaving little clearance space between the components and the interior side of the panel, hence, the requirement for "truncation" of the lock shaft. When the lock 1 is turned to its "locking" position, cam 4 engages a lip (not shown) on the inside of detachable cover 7 (Fig. 2), physically preventing its removal, and cam 5 releases the contact of microswitch 8, effectively disabling or isolating the system logic from its electrical access ports (keyboard, I/O, etc.). It should be apparent that the functions performed by cams 4 and 5 could be consolidated on a single cam part. The microswitch couples to the system (not shown) circuits via leads indicated at 9, and these circuits control panel indicator lights (LEDs) 10 via leads indi...