Optics: image projectors – Cabinet encloses projector and one side of screen
Patent
1986-04-30
1989-06-27
Shoap, Allan N.
Optics: image projectors
Cabinet encloses projector and one side of screen
353 44, 312 72, G03B 2110, G03B 2130
Patent
active
048424021
ABSTRACT:
A projection and viewing apparatus having a hollow housing with an open top and front and back walls is also provided with an optical system carriage which is mounted within the housing for rotational movement with respect to the housing. This carriage is capable of rotation from an upright position to a substantially horizontal position. The carriage is composed of a lower portion which is mounted to the housing for the rotational movement and an upper portion which is pivotally mounted with respect to the lower portion so as to be able to move from an extended position in which the upper and lower positions define the operational carriage, to a retracted position in which either the upper or lower portion is withdrawn into the other. Provision is made for locking the upper and lower portions together in the extended position. The lower carriage portion is provided with a depth dimension which is no greater than the distance between the front and rear walls of the housing. Provision is made for securing the carriage within the housing in a storage position in which the lower housing portion is retained with its depth dimension aligned between the front and rear walls of the housing, and the upper and lower housing portion are retained in the retracted position.
REFERENCES:
patent: 1306861 (1919-06-01), Sparkes
patent: 2782680 (1957-02-01), Howell
patent: 3381574 (1968-05-01), Wells
patent: 3912350 (1975-10-01), Gurubatham
patent: 4136938 (1979-01-01), Wise
patent: 4174889 (1979-11-01), Peters
patent: 4194452 (1980-03-01), Crowther et al.
McGraw-Hill Inc.
Scanlon Patrick R.
Shoap Allan N.
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