US3692392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film cartridge
Assignee: PALISADES EDUCATIONAL FOUNDATION Inc
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Filing: 1971-04-19
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Granted: 1972-09-19
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Expires: 1991-04-19
Abstract
Abstract An endless film cartridge has a lock pin to engage a sprocket hole of the film as the cartridge is removed from its holder. The lock pin holds the film correctly framed in the aperture window and assures proper engagement of the drive teeth with the film when the cartridge is mounted again in the holder. The guide pad on the holder pushes a pressure plate inwardly of the cartridge to release the film from the lock pin as the cartridge is mounted.
Inventors
- 👤 Henry L Brill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:37
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B1/00; G03B1/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
A film cartridge comprising a case, a reel in said case, an endless supply roll of film on said reel having successive picture frames and respective sprocket holes therealong, said roll having a loop between the inner and outer convolutions thereof, a flat end wall on said case and guide means leading said loop along the inner side of said end wall, said end wall having an opening exposing a portion of said loop, a pressure plate on the inner side of said loop spanning said opening, means biasing said pressure plate outwardly to retain said loop portion against said end wall, a lens aperture in said pressure plate, a lock pin on said inner side of said end wall beyond one end of said opening for detachably engaging a sprocket hole of the loop portion of the film to retain the film in a position wherein a frame thereof is correctly located at said lens aperture, and means mounting said pressure plate for displacement inwardly of the cartridge whereby upon pressing against the film via said opening the film is displaced inwardly of said case and detached from said lock pin.
Claim 2
Dependent Claim
192 words
A film cartridge comprising a case, a reel in said case, an endless supply roll of film on said reel having successive picture frames and respective sprocket holes therealong, said roll having a loop between the inner and outer convolutions thereof, a flat end wall on said case and guide means leading said loop along the inner side of said end wall, said end wall having an opening exposing a portion of said loop, a pressure plate on the inner side of said loop spanning said opening, means biasing said pressure plate outwardly to retain said loop portion against said end wall, a lens aperture in said pressure plate, a lock pin on said inner side of said end wall beyond one end of said opening for detachably engaging a sprocket hole of the loop portion of the film to retain the film in a position wherein a frame thereof is correctly located at said lens aperture, and means mounting said pressure plate for displacement inwardly of the cartridge whereby upon pressing against the film via said opening the film is displaced inwardly of said case and detached from said lock pin.
Claim 3
Dependent Claim
78 words
The cartridge set forth in claim 1 including a holder for detachably receiving said cartridge in a mounted position, a drive member on said holder having a tooth for engaging a sprocket hole in a loop portion of the film exposed by said opening in the cartridge, wherein said lock pin retains the film in said cartridge in a position for correct engagement of said drive member with the film as said cartridge is inserted in said holder.
Claim 4
Dependent Claim
51 words
The cartridge and holder set forth in claim 2 including an internal pad on an end wall of said holder for pushing the film and pressure plate inwardly of said cartridge to detach the film from said lock pin as the cartridge is inserted into a mounted position in said holder.
Claim 5
Dependent Claim
40 words
The cartridge and holder as set forth in claim 3 including locating lugs extending from said pad inwardly of said holder, and openings in said pressure plate for receiving said locating lugs as the cartridge is mounted in said holder.
Claim 6
Dependent Claim
42 words
The cartridge and holder set forth in claim 4 wherein a pair of said lugs are positioned to engage said pressure plate at opposite sides of said film to confine the film width-wise in a correct path relative to said lens aperture.
Claim 7
Dependent Claim
61 words
The cartridge and holder set forth in claim 5 including two pairs of said lugs wherein one of each of said pair of lugs is spring mounted and urged towards the other, and stop means in said holder limiting each spring urged lug at a distance equal to the width of the film from the other lug of the respective pair.
Claim 8
Dependent Claim
25 words
The cartridge and holder set forth in claim 5 including two pairs of said lugs on said pad at opposite sides of said lens aperture.
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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |