Title: Cooling system for an audio visual device

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1. A chassis for mounting mechanical and electrical components in a projector for projecting a movie film accompanied by a sound track the projector including an electrical transformer, an audio amplifier, and a fan to direct air over a projecting light source, the chassis comprises a unitary structure including:

a plate element defining a deck portion having upper and lower surfaces;

means formed integral with the chassis for mounting a film drive mechanism;

a fan mounting portion formed integral with the chassis for mounting the fan to effect the required air flow;

means formed integral with the chassis for supporting a projector leveling device;

a plurality of depending toothed flanges mounted on the lower surface of the deck to provide a path of air flow onto the fins adjacent the transformer and the slots adjacent the amplifier;

an additional slot formed on the deck portion spaced from the fins to provide additional air flow onto the electrical transformer;

a plurality of depending post means formed on the lower surface of the deck for supporting at least one cover plate below the amplifier to further control the direction of air flow;

depending post means formed adjacent the four corners of the chassis on the lower surface of the deck portion to provide for mounting of resilient projector support feet;

a plurality of electrical control apertures in the peripheral flange which provide access to a plurality of electrical control knobs; and

a film guide ramp on the upper surface of the deck to guide the film after projection onto a take-up reel.

2. A chassis for mounting mechanical and electrical components in a projector for projecting a movie film accompanied by a sound track, the projector including an electrical transformer, an audio amplifier, and a fan to direct air over a projecting light source, the chassis comprises a unitary structure including:

a plate element defining a deck portion having upper and lower surfaces;

an integral depending peripheral flange circumscribing the deck portion defining a recessed area on the underside thereof;

integral means for mounting the electrical transformer on the chassis;

heat exchange means comprising a plurality of integrally formed heat conductive fins adjacent the transformer for conducting heat away from the transformer, with a plurality of slots between the fins in communication with the atmosphere to provide a path of cooling air flow past the transformer and for efficient cooling of the fins;

Integral means for mounting the audio amplifier on the chassis;

means for defining a plurality of slots in the chassis adjacent the amplifier to provide additional air flow across the amplifier, thereby cooling the amplifier as well as the transformer prior to the air being directed by the fan across the projecting light source; and

a film guide ramp formed on the upper surface of the deck to guide the film after projection onto the pick-up reel.

Other info:

Inventors: Hadzimahalis, Theodore M. (Libertyville, IL, US)

Application Number: 539775
Filing Date: 1975-01-09
Publication_date: 1976-10-05
Assignee: Bell & Howell Company (Chicago, IL)
Primary Class(es): 352/146 352/202
Other Classes:
US Patent Ref:

2135500	Nov, 1938	Foster	352/202.
2449713	Sep, 1948	Nemeth	352/202.
3408138	Oct, 1968	Harz	352/146.

Other Refs:
Primary Examiner: Hayes, Monroe H.
Assistant Examiner:
Attorney: Schneider; Robert, Hoffman; John R., Fitz-Gerald; Roger M.