US4423974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive coupling for ribbon mechanism in typewriters and similar machines
Assignee: TRIUMPH-ADLER AG fur BURO-UND INFORMATION-STECHNIK
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Filing: 1981-12-07
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Granted: 1984-01-03
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Expires: 2001-12-07
Abstract
Abstract An engage/disengage coupling between a drive and driven part for imparting rotational force without axial force components.
Inventors
- 👤 Siegfried Mu/ ller
- 👤 Friedrich Teichmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:30
CPC Classifications
F; F16; F16D; F16D1/00; F16D1/10; F16D1/101; B; B41; B41J; B41J33/00; B41J33/14; B41J33/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
An engage/disengage coupling having a rotatable driving and a rotatable drivien part, said driving part having a central recess circumferentially bounded by a plurality of axially extending teeth defining between them substantially triangular recesses, said driven part having an axially extending pilot shaft for reception into said central recess of said driving part, and a single projection extending radially from said pilot shaft defining a substantially triangular tooth plugable into any of said triangular recesses, said teeth on said driving part and said tooth on said driven part opposing drive and driven surfaces parallel to the axes of said driving and driven parts.
Claim 2
Dependent Claim
103 words
An engage/disengage coupling having a rotatable driving and a rotatable drivien part, said driving part having a central recess circumferentially bounded by a plurality of axially extending teeth defining between them substantially triangular recesses, said driven part having an axially extending pilot shaft for reception into said central recess of said driving part, and a single projection extending radially from said pilot shaft defining a substantially triangular tooth plugable into any of said triangular recesses, said teeth on said driving part and said tooth on said driven part opposing drive and driven surfaces parallel to the axes of said driving and driven parts.
Claim 3
Dependent Claim
24 words
A coupling as recited in claim 1, wherein the axial length of said projection is shorter than the axial depth of said triangular recesses.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |