Browse Prior Art Database

Non Stall Key Mechanism

IP.com Disclosure Number: IPCOM000095707D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Crutcher, BT: AUTHOR

Abstract

The high reliability latching arrangement is adapted to be responsive to a manually pushed key operated by a typist. In such an application, it is required that the typing stroke is sufficient to positively cause engagement of a conventional latch against a small ridge or small ridges which tend to be present on the contacted surfaces of latching members. Here, a resilient plate is used as one latching member, which deforms upon key movement to then spring positively into the latched position.

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Non Stall Key Mechanism

The high reliability latching arrangement is adapted to be responsive to a manually pushed key operated by a typist. In such an application, it is required that the typing stroke is sufficient to positively cause engagement of a conventional latch against a small ridge or small ridges which tend to be present on the contacted surfaces of latching members. Here, a resilient plate is used as one latching member, which deforms upon key movement to then spring positively into the latched position.

The 90 arm 1 is journaled at stud 3. Arm 1 is biased upwardly by spring 5. Manual operation of a type key moves arm 1 clockwise by exerting a force at 7. Detent 9 has latching edge 11 and plate contact surface 13. Detent 9 is journaled to arm 1 at stud 15. Detent 9 is biased counterclockwise by spring 17. Resilient plate 19 is a latching member adapted to latch detent 9 by engaging with latching edge 1 1. Plate 19 is rigidly mounted to the frame.

In operation, a type key actuation moves arm 1 clockwise. This carries detent 9 downwardly. Contact surface 13 of detent 9 is held firmly against plate 19 by the action of spring 17. Plate 19 is initially deformed as shown by the dotted lines. Plate 19 tends to spring into motion, however, and, when it does, the motion tends to carry plate 19 past any ridges on surface 13 and into latching relationship on edge 11. The counterclockwise movement of detent 9 actuates a clutch in a power driven typewriter. High...