US3852816A — Carriage assembly for a video disc playback deck

Claim 1

Independent Claim 275 words

A carriage assembly for advancing a pickup element over an independently driven rotating information storage disc containing a spiral modulation track comprising: a carriage supporting said pickup element adjacent the surface of said disc; a frame; carriage support means for supporting said carriage on said frame for travel along a path parallel to the surface of said disc; motor driven carriage advancing means comprising a first lead screw rotatably journalled on said frame for rotation about an axis parallel to said carriage travel path for propelling said pickup element across the surface of said disc at a velocity proportional to the radial progression of the rotating spiral track; user actuated carriage positioning means comprising a rotatable control and a second lead screw also rotatably journalled on said frame for rotation about an axis parallel to said carriage travel path for manually positioning said pickup to a desired location along said spiral track in response to rotation of said control; selector means coupled to said carriage For selectively engaging said carriage with either said motor driven lead screw or said user actuated lead screw; first and second followers individually engageable, respectively, with said carriage advancing lead screw and said carriage positioning lead screw; and means for pivotally mounting said carriage on said carriage support means for displacement, in response to actuation of said selector, between an operating position in which said first follower engages said carriage advancing lead screw and said pickup is presented to said track for sensing modulation thereon, and a retracted position in which said second follower engages said carriage positioning lead screw as said pickup is withdrawn from presentation to said track.

Claim 2

Dependent Claim 275 words

A carriage assembly for advancing a pickup element over an independently driven rotating information storage disc containing a spiral modulation track comprising: a carriage supporting said pickup element adjacent the surface of said disc; a frame; carriage support means for supporting said carriage on said frame for travel along a path parallel to the surface of said disc; motor driven carriage advancing means comprising a first lead screw rotatably journalled on said frame for rotation about an axis parallel to said carriage travel path for propelling said pickup element across the surface of said disc at a velocity proportional to the radial progression of the rotating spiral track; user actuated carriage positioning means comprising a rotatable control and a second lead screw also rotatably journalled on said frame for rotation about an axis parallel to said carriage travel path for manually positioning said pickup to a desired location along said spiral track in response to rotation of said control; selector means coupled to said carriage For selectively engaging said carriage with either said motor driven lead screw or said user actuated lead screw; first and second followers individually engageable, respectively, with said carriage advancing lead screw and said carriage positioning lead screw; and means for pivotally mounting said carriage on said carriage support means for displacement, in response to actuation of said selector, between an operating position in which said first follower engages said carriage advancing lead screw and said pickup is presented to said track for sensing modulation thereon, and a retracted position in which said second follower engages said carriage positioning lead screw as said pickup is withdrawn from presentation to said track.

Claim 3

Dependent Claim 79 words

A carriage assembly as described in claim 1, wherein said spiral modulation track is contained within and annular band on said disc having a predetermined minimum inside radius; and in which said selector means includes a lifter for displacing, and releasably securing, said carriage between said operating and retracted positions and retracting means coupled to said lifter for automatically displacing said carriage to said retracted position when said pickup element overlies a point corresponding to said predetermined minimum radius.

Claim 4

Dependent Claim 58 words

A carriage assembly as described in claim 2 which further includes an adjustable carriage-borne actuator; and in which said retracting means comprises a spring loaded trigger coupled to said lifter and releasable by said carriage borne actuator, when said actuator arrives at a location corresponding to said predetermined minimum radius, to displace said carriage into said retracted position.

Claim 5

Dependent Claim 57 words

A carriage assembly as described in claim 1 wherein said followers comprise cylindrical members each having a substantially V-shaped extremity for engagement with the threads of its assigned lead screw; and said carriage comprises substantially cylindrical receptacles individually rotatably receiving said follower members thereby permitting said V-shaped extremities to continually align themselves with said lead screw threads.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-12-02	1978-06-03	1978-12-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-12-02	1982-06-03	1982-12-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-12-02	1986-06-03	1986-12-03	$7700.00	Window Closed / Lapsed

Carriage assembly for a video disc playback deck

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