Charles C Mayborg

US Patent:

43166741, Feb 23, 1982

Filed:

Mar 31, 1980

Appl. No.:

6/136001

Inventors:

Charles C. Mayborg - Lexington KY
Delbert L. Teel - Lexington KY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B41J 514

US Classification:

400478

Abstract:

A hollow tubular rubber or rubberlike deformable member is supported by a plurality of character keylevers in a typewriter keyboard and constrained against movement within the typewriter by supporting surfaces on the keylevers such that the tube engages the keylever pawls carried by the keylevers. As the keyboard of the typewriter operates, an interposer will force the keylever pawl rearward to provide complete restoration of the selection interposer. If the pawl did not rotate and the keylever is still in its depressed position upon the completion of the keyboard cycle, the selection logic would not be cleared and any following keylever input would result in a malselection. Also, interposer loading would prevent keylever restoration. The force of the interposer against the front edge of the keylever pawl will force the keylever pawl to pivot about its pivot stud and to locally compress the tube spring, formed out of a resilient pliable rubber-like material. Upon the restoration of the keylever to its rest position and withdrawal of the keylever pawl from engagement with the interposer stem, the forces generated within the tube spring during local deformation will be released and will act to restore the keylever pawl to its normal at rest position.