US3693524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter safety device in a camera provided with an electric shutter
Assignee: Nikon Corp
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Filing: 1971-09-10
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Granted: 1972-09-26
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Expires: 1991-09-10
Abstract
Abstract A safety device for an electric shutter in a camera is disclosed. The device is comprised of a wind-up lever which operates a power switch for turning the electric shutter on and off. The lever is movable through an angle of idle rotation between a retracted and extended position for respectfully turning the shutter off and on. The device also included a device for preventing actuation of the shutter release when the lever is in its retracted position to prevent photography when the electric shutter is off.
Inventors
- 👤 Koichi Furuta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:08
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A safety device for an electric shutter incorporated in a camera, said device comprising: a wind-up lever shiftable between extended and retracted positions through an angle of idle rotation; means for retaining a shutter release button; a power switch; and signal means associated with said wind-up lever and displaceable in accordance with the extended and retracted positions of said wind-up lever lying within the angle of idle rotation thereof; said signal means being disposed to release said shutter release button retaining means from retaining position and close said power switch in response to the shifting of said wind-up lever to extended position, and to bring said shutter release button retaining means into retaining position and open said power switch in response to shifting of said wind-up lever to retracted position.
Claim 2
Dependent Claim
130 words
A safety device for an electric shutter incorporated in a camera, said device comprising: a wind-up lever shiftable between extended and retracted positions through an angle of idle rotation; means for retaining a shutter release button; a power switch; and signal means associated with said wind-up lever and displaceable in accordance with the extended and retracted positions of said wind-up lever lying within the angle of idle rotation thereof; said signal means being disposed to release said shutter release button retaining means from retaining position and close said power switch in response to the shifting of said wind-up lever to extended position, and to bring said shutter release button retaining means into retaining position and open said power switch in response to shifting of said wind-up lever to retracted position.
Claim 3
Dependent Claim
32 words
A safety device as defined in claim 1, wherein said means for retaining a shutter release button comprises a switch lever rotatably mounted on a base plate by means of a shaft.
Claim 4
Dependent Claim
35 words
A safety device as defined in claim 1, wherein said power switch comprises a switch plate spring, an insulating plate and a switch plate all mounted on a base plate by means of a screw.
Claim 5
Dependent Claim
22 words
A safety device as defined in claim 1, wherein said signal member comprises a click cam plate rotatable with said wind-up lever.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |