US Patent: 3,680,754
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| Filmstrip Advancing Mechanism
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Patentees:
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| Robert N. McFadden (exact or similar names) - Fairport, Monroe County, NY |
| Frank L. Blaakman (exact or similar names) - Rochester, Monroe County, NY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 30, 1970 |
| Granted: |
Aug. 01, 1972 |
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Joel Havens
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Description: |
| Abstract:
A filmstrip advancing mechanism has a sprocket turned on a shaft carrying a sleeve with a clutch between the sleeve and the shaft. A knob turns the shaft and is movable axially to disengage the clutch for turning the shaft relative to the sleeve. The sleeve is detentable to stop the shaft at successive frame positions of the filmstrip. The sleeve carries a ratchet having a number of teeth equal to the number of detent stops, and a pivotally reciprocal pawl is mounted on the projector to engage and advance the ratchet teeth for advancing the filmstrip. A solenoid depresses the pawl lever on a signal from a tape deck accompanying the projector, and a manual button is also arranged for actuating the pawl. |
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