Patent US4194824A successfully refreshed from Google Patents.
US4194824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera equipped with automatic unwinding device
Assignee: Pentax Corp
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Filing: 1978-06-20
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Granted: 1980-03-25
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Expires: 1998-06-20
Abstract
Abstract A device for decoupling the film transport mechanism in a camera is operable either independently, for performing multiple-exposure photography, or by an unwinding lever which simultaneously reverses the drive direction of the film for unwinding.
Inventors
- 👤 Akihiro Arai
- 👤 Eiji Yamamori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:40
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
In a camera equipped with an automatic unwinding device and capable of multiple exposure operation, said camera having a film transport mechanism which is disabled by a means for disabling during both automatic unwinding and multiple exposure operations, the improvement characterized in that said disabling means comprises: independently operable multiple exposure operating means for disengaging said film transport mechanism during multiple exposure photography; and automatic unwinding operating means for both engaging said automatic unwinding device and operating said multiple exposure operating means to implement automatic unwinding.
Claim 2
Dependent Claim
86 words
In a camera equipped with an automatic unwinding device and capable of multiple exposure operation, said camera having a film transport mechanism which is disabled by a means for disabling during both automatic unwinding and multiple exposure operations, the improvement characterized in that said disabling means comprises: independently operable multiple exposure operating means for disengaging said film transport mechanism during multiple exposure photography; and automatic unwinding operating means for both engaging said automatic unwinding device and operating said multiple exposure operating means to implement automatic unwinding.
Claim 3
Dependent Claim
70 words
A camera according to claim 1, further comprising an electric motor operable in first and second rotational directions for performing both winding and unwinding operations, an unwinding drive member and a selectively engageable clutch coupling said electric motor and said unwinding drive member, said automatic unwinding operating means further comprising: switch means for controlling the rotational direction of said electric motor; means for selectively engaging said clutch for automatic unwinding.
Claim 4
Dependent Claim
128 words
A camera according to claim 1 or 2, wherein said automatic unwinding operating means comprises: a first movable member movable between an operating position in which said multiple exposure member is operated and an inoperating position in which said multiple exposure member is not operated, said first movable member being biased to said inoperating position; and locking member having a locking position in which it locks said first movable member in said inoperating position and a release position in which said first movable member is permitted to move to said operating position, said locking member being normally biased to said locking position, whereby automatic unwinding is accomplished by first moving said locking member to said unlocking position and then moving said first movable member to said operating position.
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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |