Patent US3748846A successfully refreshed from Google Patents.
US3748846A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-keeping apparatus
Assignee: Nidec Precision Corp
•
Filing: 1971-03-16
•
Granted: 1973-07-31
•
Expires: 1991-03-16
Abstract
Abstract The time-keeping apparatus comprises a timer unit capable of emitting time signals and an indicating unit having timeindicator such as hour and minute hands. The timer unit emits a time signal wave such as a supersonic wave at constant intervals by means of a synchronous motor serving as the reference of time. Communication between the timer unit and the time-indicating unit is effected by a wireless system. A signal receiver incorporated in the time-indicating unit is rendered to the condition of being able to receive a time signal a little before this signal wave is emitted to function so that, upon receipt of same, it drives a time-indicator actuating mechanism. Thereafter, the receiver is relieved of this condition. The time-indicator actuating mechanism thus driven causes the hands to be displaced in their positions in accurate agreement with the advancement of time.
Inventors
- 👤 T Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:35
CPC Classifications
G; G04; G04C; G04C13/00; G04C13/02; G04C13/021; G04C13/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
234 words
A time-keeping apparatus comprising: a time unit including; a synchronous motor the rotation of which is controlled by an AC power source; a signal-emitting device responsive to said motor for producing a signal wave at substantially constant intervals of time in accordance with said motor rotation; and a time-indicating unit powered by a DC supply responsive to the signal wave for controlling the time-indication, said timeindicating unit including; a signal receiving device activated in response to the signal wave; an electromagnetic means coupled to the output of the signal receiving device including; a solenoid, a moveable member adapted to be displaced from a normal position upon energIzation of the solenoid and a spring member for causing said moveable member to resume its normal position when de-energized, a time-indicator actuating section responsive to the electromagnetic means being adapted to rotate through a predetermined angle as a result of the return movement of the moveable member, engaging therewith, upon returning to its normal position; an off-timer circuit including a switch controlled by the electromagnetic means, for rendering said signal receiving device unresponsive to said timer unit for the period of time until the next signal wave; said switch including a set of contacts coupled to the signal receiving device for interrupting same upon actuation thereof when the moveable member is displaced, one of said contacts serving as a limit to the displacement of said moveable member.
Claim 2
Dependent Claim
234 words
A time-keeping apparatus comprising: a time unit including; a synchronous motor the rotation of which is controlled by an AC power source; a signal-emitting device responsive to said motor for producing a signal wave at substantially constant intervals of time in accordance with said motor rotation; and a time-indicating unit powered by a DC supply responsive to the signal wave for controlling the time-indication, said timeindicating unit including; a signal receiving device activated in response to the signal wave; an electromagnetic means coupled to the output of the signal receiving device including; a solenoid, a moveable member adapted to be displaced from a normal position upon energIzation of the solenoid and a spring member for causing said moveable member to resume its normal position when de-energized, a time-indicator actuating section responsive to the electromagnetic means being adapted to rotate through a predetermined angle as a result of the return movement of the moveable member, engaging therewith, upon returning to its normal position; an off-timer circuit including a switch controlled by the electromagnetic means, for rendering said signal receiving device unresponsive to said timer unit for the period of time until the next signal wave; said switch including a set of contacts coupled to the signal receiving device for interrupting same upon actuation thereof when the moveable member is displaced, one of said contacts serving as a limit to the displacement of said moveable member.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |