US4012755A — Electrical film rewinding device

Claim 1

Independent Claim 335 words

An electrically driven film rewinding device for detachable engagement with a camera for effecting film wind up within said camera, said camera carrying a rotatable film support reel upon which film is rewound during rewind device engagement, said device comprising: a body, a camera film rewind drive shaft rotatably mounted within said body and axially movable between an extend position in engagement with the camera mounted film reel and a retracted, nonengaged position when said rewinding device is attached to said camera, a rewind drive shaft drive motor within said body, clutch means for operatively connecting said drive motor to said rewind drive shaft for effecting shaft rotation, an operating shaft rotatably mounted on said body, a rewind operating lever mounted on said operating shaft for rotation about the operating shaft axis, a clutch operating and shaft rewind engaging lever resiliently mounted on said operating shaft and rotatable therewith, said rewind operating lever being rotatable from a first position where said shaft is uncoupled from said reel, said motor is disengaged, said clutch means is disengaged, through a second position to a third position wherein said clutch means is in engagement and said rewind drive shaft is projected into coupling relationship with said film support reel, normally open switch means mounted within said body and being closed in response to rotation of said rewind operating lever from said first position to at least said third position for energizing said motor to rewind said film, and wherein said camera includes a displaceable film take up releasing member shiftable from a normally film locked position to a film released position, and said rewinding device further includes mechanical interlock means responsive to rotation of said rewind operating lever from said first position to said second position to shift said film take up release member from locked position to released position prior to said rewind operating lever effecting clutch engagement and rewind drive shaft connection with said film support reel when said rewind device is attached to said camera.

Claim 2

Dependent Claim 335 words

An electrically driven film rewinding device for detachable engagement with a camera for effecting film wind up within said camera, said camera carrying a rotatable film support reel upon which film is rewound during rewind device engagement, said device comprising: a body, a camera film rewind drive shaft rotatably mounted within said body and axially movable between an extend position in engagement with the camera mounted film reel and a retracted, nonengaged position when said rewinding device is attached to said camera, a rewind drive shaft drive motor within said body, clutch means for operatively connecting said drive motor to said rewind drive shaft for effecting shaft rotation, an operating shaft rotatably mounted on said body, a rewind operating lever mounted on said operating shaft for rotation about the operating shaft axis, a clutch operating and shaft rewind engaging lever resiliently mounted on said operating shaft and rotatable therewith, said rewind operating lever being rotatable from a first position where said shaft is uncoupled from said reel, said motor is disengaged, said clutch means is disengaged, through a second position to a third position wherein said clutch means is in engagement and said rewind drive shaft is projected into coupling relationship with said film support reel, normally open switch means mounted within said body and being closed in response to rotation of said rewind operating lever from said first position to at least said third position for energizing said motor to rewind said film, and wherein said camera includes a displaceable film take up releasing member shiftable from a normally film locked position to a film released position, and said rewinding device further includes mechanical interlock means responsive to rotation of said rewind operating lever from said first position to said second position to shift said film take up release member from locked position to released position prior to said rewind operating lever effecting clutch engagement and rewind drive shaft connection with said film support reel when said rewind device is attached to said camera.

Claim 3

Dependent Claim 142 words

The film rewinding device as claimed in claim 1, wherein a cam plate is fixed to said rewind operating shaft for rotation with said rewind operating lever, a control rod is mounted for limited reciprocation adjacent said cam plate with one end in the path of said rotating cam plate, a crank arm is pivotably mounted to said body and is coupled to the end of said rod facing away from said cam plate, an axially displaceable rewind device film release pin is mounted within said device body in contact with said crank arm and movable into engagement with said film take up release member within said camera; whereby, projection of said rewind device film release pin upon rotation of said rewind operating lever from said first to said second position drives said film take up release member to its released position.

Claim 4

Dependent Claim 112 words

The device as claimed in claim 2, wherein said cam plate carries a switch actuator pin mounted thereto radially displaced from the axis of rotation of said cam plate and movable about a path which intersects normally open switch contacts of said switch means, and said switch actuator pin is mounted on said cam plate such that rotation of said rewind operating lever from an initial first position through said second and third positions to a fourth position causes said contacts to close subsequent to engagement of said clutch means and axial projection of said rewind drive shaft to effect shaft connection between said rewind drive shaft and said film support reel.

Claim 5

Dependent Claim 257 words

The device as claimed in claim 3, wherein clutch operating and rewind shaft engaging lever is pivotably mounted on said operating shaft adjacent said cam plate, a coil spring concentrically surrounds said operating shaft and has its ends abutting said clutch operating and rewind shaft engaging lever and a stop pin fixed to said cam plate to bias said lever to resiliently couple said clutch operating and rewind shaft engaging lever to said cam plate, said rewind drive shaft terminates at its lower end in a double flange clutch ring forming one clutch element of said clutch means, said rewind drive shaft rotatably carrying a driving gear which is restrained from axial movement relative to said rewind drive shaft and has formed on the face facing said flanged clutch ring a second clutch element of said clutch means, and a gear reduction unit forms a gear train between said drive motor and said rewind drive shaft mounted driving gear; whereby, said rewind operating lever in rotating from said first through said second and to said third position, causes the clutch operating and rewind shaft engaging lever which resiliently rotates therewith to axially shift said rewind drive shaft to engage said clutch elements and to cause said rewind drive shaft to operatively engage the film support reel, and wherein further rotation of said rewind operating lever causes said cam plate to rotate relative to said clutch operating and rewind shaft engaging lever against the bias of said spring to close said switch contacts and energize said drive motor.

Claim 6

Dependent Claim 135 words

The device as claimed in claim 4, further comprising a locking plate assembly pivotably mounted on said body and rotatable relative to said cam plate such that said locking plate assembly in a first position prevents rotation of said rewind operating lever from its first position, in a second position permits limited rotation of said rewind operating lever from its first position to a second position where said film take up releasing member is shifted to released position, and wherein pivoting of said locking plate assembly to a third position permits rotation of said rewind operating lever from said first position through said second and third positions to said fourth position to effect clutch engagement, rewind drive shaft connection with the film support reel and closure of the switch contacts to energize said drive motor.

Claim 7

Dependent Claim 109 words

The device as claimed in claim 5, wherein said locking plate assembly comprises: a pivotable arm mounted for rotation about an axis parallel to the plane of the cam plate, said arm carries two laterally spaced elongated locking plates extending parallel to said cam plate, one of said locking plates being longer than the other such that by rotating said locking plate assembly the ends of said laterally spaced locking plates selectively abut the edge of said cam plate or are positioned on respective sides thereof permitting unrestricted rotation of said rewind operating lever by rotation of the cam plate within the gap between said laterally spaced locking plates.

Claim 8

Dependent Claim 177 words

The device as claimed in claim 6, wherein a reciprocating lock releasing button is mounted within said body and to one side of said pivotable locking plate assembly, spring means bias said locking plate assembly into contact with said lock releasing button, a fixed stop mounted to the body on the side of said locking plate assembly opposite that of said lock releasing button to limit pivoting of said locking plate assembly against the bias of said spring to place the edge of said shorter length locking plate against the edge of said cam plate to permit partial rotation of said rewind operating lever from its first position to its second position, and wherein upon subsequent release of said lock releasing button said pivotable locking plate assembly pivots under the bias of said spring to the point where said longer length locking plate presses against the side of the cam plate, placing the cam plate within the gap between said two laterally spaced locking plates to permit rotation of the rewind operating lever beyond its second position.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-03-14	1980-09-13	1981-03-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-03-14	1984-09-13	1985-03-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-03-14	1988-09-13	1989-03-15	$7700.00	Window Closed / Lapsed

Electrical film rewinding device

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