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US3707904A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic apparatus with braking means for roll film

Assignee: Agfa Gevaert AG
•
Filing: 1971-07-26
•
Granted: 1973-01-02
•
Expires: 1991-07-26
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Abstract

Abstract A still camera wherein a spring-biased pressure plate is mounted on a movable wall of the housing and is provided with apertures adjacent to the marginal portions of roll film which is guided in a channel in front of the pressure plate. The movable wall further supports a spring-biased plate-like carrier which is located behind the pressure plate and is provided with braking members extending through the apertures of the pressure plate and into the channel to engage the respective marginal portions of roll film in the channel and to prevent uncontrolled lengthwise movements of the film. The braking members have convex filmengaging surfaces and bias the respective marginal portions of the film against guide surfaces provided on the main body portion of the camera housing. When the channel is empty, the carrier abuts against the rear side of the pressure plate.

Inventors

  • 👤 D Engelsmann
  • 👤 K Zattler
  • 👤 F Kessler
  • 👤 D Mass

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 20:36
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 20 words
A combination as defined in claim 1, further comprising biasing means for yieldably urging said braking members into said channel.
Claim 2
Dependent Claim 15 words
A combination as defined in claim 1, wherein said braking members have convex film-engaging surfaces.
Claim 3
Dependent Claim 40 words
A combination as defined in claim 1, wherein said housing is provided with guide surfaces located opposite said braking members so that said braking members urge the respective marginal portions of the film in said channel against such guide surfaces.
Claim 4
Dependent Claim 38 words
A combination as defined in claim 1, wherein said housing comprises a main body portion and a wall movable with reference to said main body portion, said pressure plate and said braking members being mounted on said wall.
Claim 5
Dependent Claim 71 words
A combination as defined in claim 5, wherein said braking members are arranged to urge the respective marginal portions of the film in said channel against said main body portion of said housing. 7. A combination as defined in claim 1, wherein said pressure plate is provided with a plurality of apertures along each side of said channel and the number of said braking members equals the number of said apertures.
Claim 6
Dependent Claim 136 words
In a photographic apparatus, a combination comprising a housing defining a channel for lengthwise transport of photographic film; a spring-biased pressure plate adjacent to one side of said channel, said pressure plate having at least two apertures adjacent to different marginal portions of the film in said channel; braking members mounted in said housing and extending through said apertures and into said channel to engage and to apply a braking force against the respective marginal portions of the film in said channel; a carrier supporting said braking members; and biasing means disposed between said carrier and said housing to bias said carrier against said pressure plate in the absence of film in said channel and to bias said braking members against the respective marginal portions of the film when such film is located in said channel.
Claim 7
Dependent Claim 13 words
A combination as defined in claim 8, wherein said carrier is a plate.
Claim 8
Dependent Claim 17 words
A combination as defined in claim 8, wherein said biasing means comprises at least one leaf spring.

References Cited (Backward Citations)

US1728670A Cited
US2144258A Cited
US2192692A Cited
US2395590A Cited
US2903953A Cited
US3103861A Cited
US3311037A Cited
US3380361A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-02 1976-07-03 1977-01-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-02 1980-07-03 1981-01-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-02 1984-07-03 1985-01-02 $7700.00 Window Closed / Lapsed

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