US4107481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone instruments
Assignee: Post Office
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Filing: 1977-04-07
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Granted: 1978-08-15
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Expires: 1997-04-07
Abstract
Abstract The invention relates to a switching device for energizing and de-energizing a telephone instrument in response to removal and replacement of the handset. The device comprises a platform for receiving a capsule of the handset, the said platform being pivotal against a bias. The weight of the handset moves the platform to de-energize the device when the handset is in position on the instrument. The arrangement has the characteristic that secure location of the platform is provided whether the instrument is in the horizontal or the vertical mode.
Inventors
- 👤 Digby Redshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:51
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/04; H04M1/06; H04M1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A switching device for energizing and de-energizing a telephone instrument in response to removal and replacement of the hand-set, comprising a platform for receiving one capsule of the hand-set, an abutment projecting from the plane of the platform providing a location for the capsule and including at least two linkages each having a part pivotally connected to the platform, a pivotal support for each linkage, the axis of all the pivots being parallel to one another and the platform and the linkages being movable against spring bias from a first position at which the instrument is energized, to a second position at which the instrument is de-energized, by the gravity bias of the hand-set with the capsule on the platform, the arrangement being that placing the hand-set on the instrument either in the horizontal or the vertical mode with the capsule on the platform provides secure cradled location of the hand-set and causes movement of the linkages to the second position.
Claim 2
Dependent Claim
161 words
A switching device for energizing and de-energizing a telephone instrument in response to removal and replacement of the hand-set, comprising a platform for receiving one capsule of the hand-set, an abutment projecting from the plane of the platform providing a location for the capsule and including at least two linkages each having a part pivotally connected to the platform, a pivotal support for each linkage, the axis of all the pivots being parallel to one another and the platform and the linkages being movable against spring bias from a first position at which the instrument is energized, to a second position at which the instrument is de-energized, by the gravity bias of the hand-set with the capsule on the platform, the arrangement being that placing the hand-set on the instrument either in the horizontal or the vertical mode with the capsule on the platform provides secure cradled location of the hand-set and causes movement of the linkages to the second position.
References Cited (Backward Citations)
US2762869A
Cited
DE1134715B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |