Browse Prior Art Database

Shift Lock Mechanism

IP.com Disclosure Number: IPCOM000093531D
Original Publication Date: 1967-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Walton, ND: AUTHOR

Abstract

This shift lock mechanism for a typewriter comprises shift keylever 10 and shift lock keylever 12. Keylever 10 is pivoted about keylever mounting rod 13 and is biased upwardly by spring 14 to a position in contact with upper stop 15. Keylever 12 is pivotally mounted on keylever 10 by stud 16 and guided for vertical movement by stud 17 which projects into a slot in keylever 10. Keylever 12 is biased upwardly against stop 15 by spring 18. A formed ear 19 extends from keylever 12 and contacts shift lock latch. The latter is pivotally mounted on keylever 10 by stud 21 and biased counterclockwise by spring 22.

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Shift Lock Mechanism

This shift lock mechanism for a typewriter comprises shift keylever 10 and shift lock keylever 12. Keylever 10 is pivoted about keylever mounting rod 13 and is biased upwardly by spring 14 to a position in contact with upper stop 15. Keylever 12 is pivotally mounted on keylever 10 by stud 16 and guided for vertical movement by stud 17 which projects into a slot in keylever 10. Keylever 12 is biased upwardly against stop 15 by spring 18. A formed ear 19 extends from keylever 12 and contacts shift lock latch. The latter is pivotally mounted on keylever 10 by stud 21 and biased counterclockwise by spring 22.

Inadvertent locking of latch 20 on keeper 23 when a sharp force is applied to keylever 10 is prevented. Under such conditions keylever 12 is held in its upward position against stop 15 by spring 18 and does not travel downward with keylever 10. Latch 20 which is carried down by keylever 10 is allowed to rotate counterclockwise under the action of spring 22.

Latch 20 is therefore pulled away from keeper 23. Latch 20 receives no impulse or force which would tend to move it under keeper 23 to inadvertently lock the shift mechanism when operating keylever 10.

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