US3628432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film metering mechanism
Assignee: Eastman Kodak Co
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Filing: 1969-09-05
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Granted: 1971-12-21
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Expires: 1989-09-05
Abstract
Abstract A film metering mechanism for cameras using film having spaced perforations at predetermined metering intervals, the mechanism including a film-advancing member and a sensing member adapted to engage a perforation to control film transport. A continuous biasing force is applied to the film-sensing member so as to resiliently urge it in a direction to intercept and engage a respective perforation as the film is advanced. An additional biasing force is applied to the film-sensing member to transiently increase the total biasing force only during operation of the film-advancing member. Thus, in order to disengage the film-sensing member from a perforation for whatever purpose, it is necessary to overcome only the continuous biasing force.
Inventors
- 👤 Helmut Ettischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:48
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
113 words
In a camera for use with film having discontinuities spaced at predetermined metering intervals, said camera including means for advancing film in said camera and a film-sensing member movable into and out of engagement with a film discontinuity to control said film-advancing means, the improvement comprising: a. means for applying a continuous biasing force to said filmsensing member in a direction to move said film-sensing member into engagement with a discontinuity; and b. means for applying an additional biasing force to said filmsensing member in said direction only during operation of said film-advancing means, said film-sensing member being movable out of engagement with a discontinuity in opposition to only said continuous biasing force.
Claim 2
Dependent Claim
113 words
In a camera for use with film having discontinuities spaced at predetermined metering intervals, said camera including means for advancing film in said camera and a film-sensing member movable into and out of engagement with a film discontinuity to control said film-advancing means, the improvement comprising: a. means for applying a continuous biasing force to said filmsensing member in a direction to move said film-sensing member into engagement with a discontinuity; and b. means for applying an additional biasing force to said filmsensing member in said direction only during operation of said film-advancing means, said film-sensing member being movable out of engagement with a discontinuity in opposition to only said continuous biasing force.
Claim 3
Dependent Claim
120 words
In a camera for use with film having discontinuities spaced at predetermined metering intervals, said camera including means for advancing film in said camera and a film-sensing member movable into and out of engagement with a film discontinuity to control said film-advancing means, the improvement comprising: a. means for applying a continuous biasing force to said film-sensing member in a direction to move said film-sensing member into engagement with a discontinuity; b. means actuable for applying an additional biasing force to said film-sensing member in said direction only during operation of said film-advancing means; and c. means for applying a third force To said film-sensing member to overcome said continuous biasing force to withdraw said film-sensing member from a discontinuity.
Claim 4
Dependent Claim
120 words
In a camera for use with film having discontinuities spaced at predetermined metering intervals, said camera including means for advancing film in said camera and a film-sensing member movable into and out of engagement with a film discontinuity to control said film-advancing means, the improvement comprising: a. means for applying a continuous biasing force to said film-sensing member in a direction to move said film-sensing member into engagement with a discontinuity; b. means actuable for applying an additional biasing force to said film-sensing member in said direction only during operation of said film-advancing means; and c. means for applying a third force To said film-sensing member to overcome said continuous biasing force to withdraw said film-sensing member from a discontinuity.
Claim 5
Dependent Claim
60 words
The improvement as defined in claim 2 wherein: a. said means for advancing film in said camera comprises a transport lever movable in a direction to advance the film; and b. said means for applying said additional biasing force to said film-sensing member is actuable in response to movement of said transport lever in the direction to advance the film.
Claim 6
Dependent Claim
83 words
The improvement as defined in claim 2 wherein: a. said means for advancing film in said camera comprises a transport lever movable in a direction to advance the film; and b. said means for applying an additional biasing force to said film-sensing member comprises a spring movable into engagement with said film-sensing member to apply said additional biasing force thereto, and means for moving said spring into engagement with said film-sensing member in response to movement of said transport lever to advance film.
Claim 7
Dependent Claim
154 words
In a camera for use with film having discontinuities spaced at predetermined metering intervals, said camera including means for advancing film in said camera and a film-sensing member movable into and out of engagement with a film discontinuity to control said film-advancing means, the improvement comprising: a. means for applying a continuous biasing force to said film-sensing member in a first direction to move said film-sensing member into engagement with a discontinuity; b. a transport lever forming at least part of said film-advancing means and movable in a second direction to advance the film; c. spring means movable into tensioned engagement with said film-sensing member for applying an additional biasing force to the film-sensing member in said first direction; and d. means for interconnecting said transport lever and said spring means for moving said spring means into tensioned engagement with said film-sensing member only when said transport lever is moved in said second direction.
Claim 8
Dependent Claim
154 words
In a camera for use with film having discontinuities spaced at predetermined metering intervals, said camera including means for advancing film in said camera and a film-sensing member movable into and out of engagement with a film discontinuity to control said film-advancing means, the improvement comprising: a. means for applying a continuous biasing force to said film-sensing member in a first direction to move said film-sensing member into engagement with a discontinuity; b. a transport lever forming at least part of said film-advancing means and movable in a second direction to advance the film; c. spring means movable into tensioned engagement with said film-sensing member for applying an additional biasing force to the film-sensing member in said first direction; and d. means for interconnecting said transport lever and said spring means for moving said spring means into tensioned engagement with said film-sensing member only when said transport lever is moved in said second direction.
Claim 9
Dependent Claim
47 words
The improvement as defined in claim 5 wherein said interconnecting means comprises: a. lever means drivingly coupled to said spring means; and b. cam means interconnecting said transport lever and said lever means for moving said lever means upon movement of said transfer lever to advance film.
Claim 10
Dependent Claim
103 words
In a camera for use with film having discontinuities at predetermined metering intervals, said camera including a film-sensing member movable into and out of engagement with a film discontinuity to control film advancement and shutter operator means, the improvement comprising: a. means for applying a continuous biasing force to said film-sensing member in a direction to move said film-sensing member into engagement with a discontinuity; b. means for applying an additional biasing force to said film-sensing member in sad direction when the film is being advanced; and c. means for disabling said additional force apply means during operation of said shutter operator means.
Claim 11
Dependent Claim
103 words
In a camera for use with film having discontinuities at predetermined metering intervals, said camera including a film-sensing member movable into and out of engagement with a film discontinuity to control film advancement and shutter operator means, the improvement comprising: a. means for applying a continuous biasing force to said film-sensing member in a direction to move said film-sensing member into engagement with a discontinuity; b. means for applying an additional biasing force to said film-sensing member in sad direction when the film is being advanced; and c. means for disabling said additional force apply means during operation of said shutter operator means.
References Cited (Backward Citations)
US1828205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |