Browse Prior Art Database

Keyboard Interlock System

IP.com Disclosure Number: IPCOM000095133D
Original Publication Date: 1965-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Hickerson, JE: AUTHOR

Abstract

A keyboard interlock is provided that prevents the simultaneous actuation of two keys. The interlock permits depression of a key while the operation initiated by the previous depression of another key is still being performed.

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Keyboard Interlock System

A keyboard interlock is provided that prevents the simultaneous actuation of two keys. The interlock permits depression of a key while the operation initiated by the previous depression of another key is still being performed.

Depression of key 10 causes straightening of flexible spring 11 and sensing pin 12 moves to the left. Pin 12 engages and pivots interlock release bail 13 and blade 14 having the same thickness as pin 12 moves from ballsometer 15. Pin 12 enters the ballsometer 15 and the spacing between the disks 16 forming the ballsometer is such that another key cannot be depressed at this time.

Pin 12 continues to move to the left and tab 17 eventually clears bail 18. Pin 12 is immediately pulled down by spring 19. Thus, the lower end of pin 12 enters coded apertures 20 in a group of vertically stacked slides 21. These are connected with other apparatus, not shown, for initiating a selected operation in accordance with the pin 12 cooperating with it. Projection 22 of pin 12 enters a ballsometer 23 provided by disks 24. These are spaced to prevent more than one pin from entering the coded apertures 20 in the slides 21 at one time. As soon as pin 12 enters ballsometer 23, it moves out of engagement with ballsometer 15. This permits a second key to be depressed and the sensing pin associated with it moves into ballsometer 15. However, the second sensing pin cannot enter ballsometer 23 until the pin 12 is removed from ballsometer 23...