US3577900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film-metering and double-exposure prevention mechanism for photographic camera
Assignee: Eastman Kodak Co
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Filing: 1968-07-15
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Granted: 1971-05-11
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Expires: 1988-07-15
Abstract
Abstract A double-exposure prevention device for a camera having a lockable film advance includes a trigger which is blocked to prevent a second exposure by an element controlled by a spring whose controlling function is adjustable by the mechanism in the camera which locks film advance.
Inventors
- 👤 Dean M Peterson
- 👤 Charles E Pickering
- 👤 Fredric A Mindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:06
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
In a camera using an elongate strip of photographic film, said camera including image-forming means operable to make an exposure, film-advancing means to advance said strip, advancement-blocking means movable to an operative position disabling said film-advancing means after advancement of said strip, and a trigger member movable to operate the image-forming means, the improvement comprising: a. a trigger-blocking member movable between i. a blocking position in which said trigger-blocking member is engageable with said trigger member to block movement thereof and prevent operation of the image-forming means and ii. a retracted position in which said trigger-blocking member is out of engageable relation with said trigger member, and b. trigger-blocking control means comprising resilient means adjustable by said advancement-blocking means i. to resiliently bias said trigger-blocking means toward said blocking position while said advancement-blocking means is out of the operative position and ii. to resiliently bias said trigger-blocking member toward said retracted position while said advancement-blocking means is in the operative position.
Claim 2
Dependent Claim
161 words
In a camera using an elongate strip of photographic film, said camera including image-forming means operable to make an exposure, film-advancing means to advance said strip, advancement-blocking means movable to an operative position disabling said film-advancing means after advancement of said strip, and a trigger member movable to operate the image-forming means, the improvement comprising: a. a trigger-blocking member movable between i. a blocking position in which said trigger-blocking member is engageable with said trigger member to block movement thereof and prevent operation of the image-forming means and ii. a retracted position in which said trigger-blocking member is out of engageable relation with said trigger member, and b. trigger-blocking control means comprising resilient means adjustable by said advancement-blocking means i. to resiliently bias said trigger-blocking means toward said blocking position while said advancement-blocking means is out of the operative position and ii. to resiliently bias said trigger-blocking member toward said retracted position while said advancement-blocking means is in the operative position.
Claim 3
Dependent Claim
119 words
The invention defined by claim 1 in which said trigger-blocking control means comprises: a. A first resilient member constantly applying to said trigger-blocking member a resilient force urging said trigger-blocking member toward one of said positions, b. a second resilient member adjustable i. to a first condition in which said second resilient member is ineffective to prevent said first resilient member from biasing said trigger-blocking member toward said one position and ii. to a second condition in which said second resilient member opposes said first resilient member and is effective to bias said trigger-blocking member toward the other of said positions, and c. adjusting means for adjusting said second resilient member in response to movement of said advancement-blocking means.
Claim 4
Dependent Claim
20 words
The invention defined by claim 2 in which said first resilient member urges said trigger-blocking member toward said retracted position.
Claim 5
Dependent Claim
163 words
In a camera according to claim 1, the further improvement comprising: a. a reset member movable between a cocked position and a released position, b. spring means resiliently urging said reset member toward said released position, c. latch means for operatively connecting said reset member with said trigger member during movement of said trigger member to move said reset member from said released position to said cocked position against the influence of said spring means, d. latch release means for operatively disconnecting said reset member from said trigger member in response to movement of said trigger member after operation of the image-forming means to allow said spring member to move said reset member from said cocked position to said released position independently of said trigger member, and e. abutment means for connecting said reset member with said advancement-blocking means during movement of said reset member from said cocked position to said released position to move said advancement-blocking means out of said operative position.
Claim 6
Dependent Claim
139 words
A photographic camera comprising: a. a film advance mechanism including an advancement-blocking member movable between an operative position disabling the film advance mechanism and an inoperative position, b. a trigger member movable to make an exposure, c. a trigger-blocking member movable between an inoperative location and an operative location in engagement with said trigger member to prevent movement thereof, d. resilient means adjustable i. to a first condition to bias said trigger-blocking member toward said inoperative location and ii. to a second condition to bias said trigger-blocking member toward said operative location, and e. adjusting means responsive to movement of said advancement-blocking member for adjusting said resilient means i. to said first condition upon movement of said advancement-blocking member to said operative position and ii. to said second condition upon movement of said advancement-blocking member to said inoperative position.
Claim 7
Dependent Claim
139 words
A photographic camera comprising: a. a film advance mechanism including an advancement-blocking member movable between an operative position disabling the film advance mechanism and an inoperative position, b. a trigger member movable to make an exposure, c. a trigger-blocking member movable between an inoperative location and an operative location in engagement with said trigger member to prevent movement thereof, d. resilient means adjustable i. to a first condition to bias said trigger-blocking member toward said inoperative location and ii. to a second condition to bias said trigger-blocking member toward said operative location, and e. adjusting means responsive to movement of said advancement-blocking member for adjusting said resilient means i. to said first condition upon movement of said advancement-blocking member to said operative position and ii. to said second condition upon movement of said advancement-blocking member to said inoperative 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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |