Browse Prior Art Database

Keying Mechanism

IP.com Disclosure Number: IPCOM000093277D
Original Publication Date: 1967-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Laybourn, RJ: AUTHOR [+2]

Abstract

In this keying mechanism, key button 10 is attached to key stem 12. Depressing button 10 moves stem 12 downward around fixed pivot 14. latch member 16 is pivotally attached to stem 12. The downward movement of stem 12 causes flat surface 18 of latch 16 to engage armature member 20 and rock the latter about support 22. Further depression of latch 16 causes cam face portion 24 of latch 16 to engage a camming surface on support member 22. This causes latch 16 to be removed to the right and disengage surface 18 from armature 20. The latter then returns to its original state under the force of spring 24.

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Keying Mechanism

In this keying mechanism, key button 10 is attached to key stem 12. Depressing button 10 moves stem 12 downward around fixed pivot 14. latch member 16 is pivotally attached to stem 12. The downward movement of stem 12 causes flat surface 18 of latch 16 to engage armature member 20 and rock the latter about support 22. Further depression of latch 16 causes cam face portion 24 of latch 16 to engage a camming surface on support member 22. This causes latch 16 to be removed to the right and disengage surface 18 from armature 20. The latter then returns to its original state under the force of spring
24. The release of armature 20 and the subsequent closing of the gap between the armature and permanent magnets 26 and pole piece 28 induces an electrical signal in coil 30 to generate an electrical signal denoting the code selected for the depressed key. Spring 24 also returns latch 16 and stem 12 to its original position ready for the next key stroke. Coil 30 can be a printed circuit coil which is mounted over pole piece 28. In addition, multiple coils can be placed on pole piece 28 to generate a combination code representative of the depressed key.

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