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Low Cost Keyboard With One Universal Interposer

IP.com Disclosure Number: IPCOM000083924D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

deKler, D: AUTHOR

Abstract

A keyboard with a substantially reduced number of parts having a single universal interposer is illustrated.

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Low Cost Keyboard With One Universal Interposer

A keyboard with a substantially reduced number of parts having a single universal interposer is illustrated.

The case illustrated is that of one of the keys depressing key lever 10. Key lever 10 is coded such that all bails are depressed and thus selects an appropriate character. Vanes 12 are depressed by code fingers 11 on key lever
10. The rocking of a vane 12 in a counterclockwise direction is accomplished when the key lever 10 is forced downward.

As key lever 10 is forced downward, leaf spring 8 flexes in a direction indicated by the related arrow, and the tip of leaf spring 8 will engage key lever 10 in the region indicated at 9 to trap key lever 10 in its depressed position. By forcing the vanes 12 to rotate in a counterclockwise direction, they engage the tops of selection pawls 14. Lugs 15 on interposer 16 engage the selection pawls 14 to hold them upright.

Upon the depression of key lever 10, vane 28 depresses trip pawl 30 which, in turn, acts to rotate tripping lever 26 counterclockwise about its pivot point, thus releasing cam and filter shaft 20.

As shaft 20 rotates in a clockwise direction, it forces interposer 16 rightward, thus engaging the top of the selection pawls 14 with the vanes 12 which have been depressed. This causes a rotary motion around their pivot points in a counterclockwise direction. The multiplied motion of selecting pawls 14 is transmitted to selection bails 18, thus controlling the...