Patent US3583799A successfully refreshed from Google Patents.
US3583799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture projector
Assignee: Link Flight Simulation Corp
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Filing: 1968-09-05
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Granted: 1971-06-08
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Expires: 1988-09-05
Abstract
Abstract The disclosed embodiment of the present invention is a motion picture projector which includes a simplified threading and loading apparatus and several novel failsafe devices. The projector is provided with a film trap gate, a plurality of sprockets for forming loops in the film on opposite sides of the gate, and tensioning means on opposite sides of the gate for maintaining a predetermined tension in the film strip. The tensioning means are moveable to a ''''load'''' position with respect to the associated sprockets on opposite sides of the gate to form a substantially straight line path between an associated reel and the sprocket adjacent the film trap gate to permit simplified loading and threading of the film on the projector. In addition, several failsafe switches are provided which maintain the drive system of the projector inoperative until all of the sprockets, pressure rollers, and film trap gate are in the operating position. Each of the reels are provided with a tensioning motor associated with the tensioning means and are further provided with brakes which engage the reel shafts upon the occurrence of a power failure or in the event that one of the interlock switches is actuated.
Inventors
- 👤 Robert Charles Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:10
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/56
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
186 words
A motion pitcure film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel, b. a pair of film tensioning apparatus disposed on opposite Sides of said gate, c. a first sprocket mounted between one tensioning apparatus and one side of said gate, d. a second sprocket mounted between the other of said tensioning apparatus and the other side of said gate, each of said tensioning apparatus including an idler roller, a tensioning roller, and a tensioning arm mounted for pivot movement on a shaft at one end thereof and and supporting said tensioning roller on the other end thereof, said tensioning roller being engageable with the film, means for biasing said tensioning arm in a direction to force the film to form a loop from said roller and a respective one of said sprockets over said tensioning roller, and means for rotating said tensioning arm against the bias of said biasing means to a position in which the film can be loaded from the supply reel to a respective one of said sprockets in a substantially straight line path.
Claim 2
Dependent Claim
186 words
A motion pitcure film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel, b. a pair of film tensioning apparatus disposed on opposite Sides of said gate, c. a first sprocket mounted between one tensioning apparatus and one side of said gate, d. a second sprocket mounted between the other of said tensioning apparatus and the other side of said gate, each of said tensioning apparatus including an idler roller, a tensioning roller, and a tensioning arm mounted for pivot movement on a shaft at one end thereof and and supporting said tensioning roller on the other end thereof, said tensioning roller being engageable with the film, means for biasing said tensioning arm in a direction to force the film to form a loop from said roller and a respective one of said sprockets over said tensioning roller, and means for rotating said tensioning arm against the bias of said biasing means to a position in which the film can be loaded from the supply reel to a respective one of said sprockets in a substantially straight line path.
Claim 3
Dependent Claim
125 words
A motion picture film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel; b. a first sprocket arrangement for forming a loop in the film on one side of said gate; c. a second sprocket arrangement for forming a loop in the film on the other side of said gate; d. a motor having an output shaft connected to one of said reels e. said film trap gate including an element which is movable from a closed position to an open position to accept the film therein; f. means for sensing the position of said element for controlling said motor; and g. a brake mounted on said output shaft, said sensing means being disposed for controlling said brake.
Claim 4
Dependent Claim
125 words
A motion picture film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel; b. a first sprocket arrangement for forming a loop in the film on one side of said gate; c. a second sprocket arrangement for forming a loop in the film on the other side of said gate; d. a motor having an output shaft connected to one of said reels e. said film trap gate including an element which is movable from a closed position to an open position to accept the film therein; f. means for sensing the position of said element for controlling said motor; and g. a brake mounted on said output shaft, said sensing means being disposed for controlling said brake.
Claim 5
Dependent Claim
125 words
A motor picture film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel; b. a first sprocket arrangement for forming a loop in the film on one side of said gate; c. a second sprocket arrangement for forming a loop in the film on the other side of said gate; d. a motor having an output shaft connected to one of said reels; e. one of said sprocket arrangement including an element which is movable from a closed position to an open position to accept the film therein; f. means for sensing the position of said element for controlling said motor; and g. a brake mounted on said output shaft, said sensing means being for controlling said brake.
Claim 6
Dependent Claim
125 words
A motor picture film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel; b. a first sprocket arrangement for forming a loop in the film on one side of said gate; c. a second sprocket arrangement for forming a loop in the film on the other side of said gate; d. a motor having an output shaft connected to one of said reels; e. one of said sprocket arrangement including an element which is movable from a closed position to an open position to accept the film therein; f. means for sensing the position of said element for controlling said motor; and g. a brake mounted on said output shaft, said sensing means being for controlling said brake.
Claim 7
Dependent Claim
129 words
A motion picture film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel; b. a first sprocket arrangement for forming a loop in the film on one side of said gate; c. a second sprocket arrangement for forming a loop in the film on the other side of said gate; d. first means for supporting the film between said first sprocket arrangement and the supply reel; e. second means for supporting the film between said sprocket arrangement and the takeup reel; and f. third means for displacing said first and second means to a position which is substantially in a straight line between the supply reel and said first sprocket arrangement and between said second sprocket arrangement and the takeup reel respectively.
Claim 8
Dependent Claim
129 words
A motion picture film transport, comprising: a. a film trap gate positioned between a supply reel and a takeup reel; b. a first sprocket arrangement for forming a loop in the film on one side of said gate; c. a second sprocket arrangement for forming a loop in the film on the other side of said gate; d. first means for supporting the film between said first sprocket arrangement and the supply reel; e. second means for supporting the film between said sprocket arrangement and the takeup reel; and f. third means for displacing said first and second means to a position which is substantially in a straight line between the supply reel and said first sprocket arrangement and between said second sprocket arrangement and the takeup reel respectively.
Claim 9
Dependent Claim
37 words
A motion picture film transport as defined in claim 4 wherein said first and said second means each includes a tensioning roller engageable with the film and a tensioning arm supporting a respective one of said rollers.
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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |