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US3874162A
Expired / Lapsed
US
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Solid state watch stem detent and switch assembly
Assignee: Timex Group USA Inc
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Filing: 1974-07-22
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Granted: 1975-04-01
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Expires: 1994-07-22
Abstract
Abstract A solid state digital watch comprises a stem detent and switch assembly which includes a crown portion on the outside of the watch case and a shaft portion extending therethrough. The shaft portion includes an intermediate rectangular section on the inside of the case which cooperates with a single stamped spring to provide a four position rotary detent action. In addition to permitting detent holding of the stem in the proper contact position, this arrangement also provides electrical contact to ground the stem to the case. The internal end of the shaft includes an eccentric tab which contacts one of three precisely positioned blades when the stem is rotated to advance the minutes or hours counters, to reset the seconds counter or to shut down the watch.
Inventors
- 👤 Raymond Robert Boxberger
- 👤 Jack Schwartzschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:58
CPC Classifications
G; G04; G04C; G04C3/00; G04C3/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
98 words
A stem detent and switch assembly for a solid state digital watch with a circuit inside a case which comprises: an elongated shaft, an eccentric tab at the interior end thereof, an intermediate rectangular section and an end portion projecting outwardly from the case, a plurality of switch blades mounted for selective engagement with the eccentric tab to provide predetermined setting functions for the watch in cooperation with the watch circuit and, a spring member engaging the rectangular section to provide a detent action and having a base portion biased against the case to provide electrical contact therewith.
Claim 2
Dependent Claim
98 words
A stem detent and switch assembly for a solid state digital watch with a circuit inside a case which comprises: an elongated shaft, an eccentric tab at the interior end thereof, an intermediate rectangular section and an end portion projecting outwardly from the case, a plurality of switch blades mounted for selective engagement with the eccentric tab to provide predetermined setting functions for the watch in cooperation with the watch circuit and, a spring member engaging the rectangular section to provide a detent action and having a base portion biased against the case to provide electrical contact therewith.
Claim 3
Dependent Claim
66 words
A stem detent and switch assembly for a solid state digital watch in accordance wIth claim 1 wherein : the plurality of switch blades comprise a pair of spaced apart cantilevered blades mounted opposite each other in the same plane and a third cantilever blade mounted in the space between the opposed blades and in a plane parallel to the plane of the first two blades.
Claim 4
Dependent Claim
55 words
A stem detent and switch assembly for a solid state digital watch in accordance with claim 1 wherein: the diameter of the rectangular section is less than the diameter of the shaft portion to provide a shoulder for engagement by the spring member to bias the stem axially regardless of its rotational position during detenting
Claim 5
Dependent Claim
78 words
A stem detent and switch assembly for a solid state digital watch in accordance with claim 1 wherein: the cooperating spring member comprises an elongated base portion in biased engagement with the watch case, and, a pair of protruding substantially U-shaped arms extending therefrom with the juxtaposed arms being free at the ends thereof to exert radial locking pressure on the rectangular section of the shaft which is located therebetween and to exert axial biasing of the stem.
Claim 6
Dependent Claim
33 words
A stem detent and switch assembly for a solid state digital watch in accordance with claim 1 wherein: the rectangular section cooperates with the spring to provide a four position rotary detent action.
Claim 7
Dependent Claim
26 words
A stem detent and switch assembly for a solid state digital watch in accordance with claim 1 wherein: the switch blades comprise thin beryllium copper stampings.
Claim 8
Dependent Claim
53 words
A stem detent and switch assembly for a solid state digital watch in accordance with claim 1 wherein: the end portion of the shaft projecting outwardly from the case includes a crown mounted thereon, and, the cantilevered switch blades are connected at one end thereof to the solid state circuit of the watch.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |