Patent US3870411A successfully refreshed from Google Patents.
US3870411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsible slide projection theatre
Assignee: MOTIVA Ltd
•
Filing: 1973-02-26
•
Granted: 1975-03-11
•
Expires: 1993-02-26
Abstract
Abstract A highly-compact, collapsible rear-screen theatre of attachecase size for a slide projector having a box-like housing on whose front wall is mounted a projection lens at a position adjacent one side of the housing. The theatre includes an opentop casing for accommodating the slide projector and a minor reflector which receives an image from the lens and directs it laterally onto an intermediate reflector that directs the image upwardly toward a major reflector pivotally mounted at one end of the casing. The major reflector is shiftable from a collapsed position overlying the top of the casing to an operative, inclined position in which the received image is directed toward the rear of the translucent screen pivotally mounted at the other end of the casing. The screen is shiftable from a collapsed position overlying the top of the casing to an operative, erect position for presentation of the image to a viewer. A cover is provided which, in its collapsed state, overlies both the collapsed screen and the collapsed major reflector and encloses the casing. The cover is mechanically linked to the screen and to the reflector such that when the cover is elevated, it acts to raise both the screen and the major reflector to their operative positions, the cover then extending between the upper edges of the screen and the major reflector.
Inventors
- 👤 Robert C Schwartz
- 👤 Frederick Burke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:12
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/30; G03B21/10; G03B23/00; G03B23/02; G03B23/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
351 words
A compact, collapsible theatre for a standard slide projector having a box-like housing on whose front wall is mounted a projection lens that is disposed adjacent one side of the housing, said theatre comprising: A. an open top box-like casing for accommodating said projector and having a narrow zone therein at one end of the casing in advance of the front wall of the housing, the optical axis of said projection lens being parallel to the side of the casing which corresponds to said one side of said housing, said casing having a width which is substantially the same as that of said housing and a height substantially the same as that of said housing; B. a translucent screen hinged to said casing at the other end thereof and shiftable from an operative position in which the screen is erect, to a collapsed position in which the screen is folded over the top of the casing; C. a reflecting system constituted by a minor reflector disposed in said zone and oriented to receive an image from said lens and to direct it laterally onto an intermediate reflector disposed in said zone and oriented to direct the image upwardly toward a major reflector, said major reflector being hinged to said casing at said one end thereof and being shiftable from an operative position in which it is oriented to direct the image received from the intermediate reflector onto the rear of said erect screen along an optical path parallel to the optical axis of said projection lens, to a collapsed position in which it is folded over the top of the casing; and D. a cover for said casing, said cover being operatively linked both to said screen and said major reflector whereby when said cover is lifted it causes both said screen and said major reflector to shift to their operative positions at which point the cover extends therebetween, and when said cover is lowered it causes both said screen and said major reflector to shift to their collapsed positions, at which point the cover lies thereover to enclose said casing.
Claim 2
Dependent Claim
351 words
A compact, collapsible theatre for a standard slide projector having a box-like housing on whose front wall is mounted a projection lens that is disposed adjacent one side of the housing, said theatre comprising: A. an open top box-like casing for accommodating said projector and having a narrow zone therein at one end of the casing in advance of the front wall of the housing, the optical axis of said projection lens being parallel to the side of the casing which corresponds to said one side of said housing, said casing having a width which is substantially the same as that of said housing and a height substantially the same as that of said housing; B. a translucent screen hinged to said casing at the other end thereof and shiftable from an operative position in which the screen is erect, to a collapsed position in which the screen is folded over the top of the casing; C. a reflecting system constituted by a minor reflector disposed in said zone and oriented to receive an image from said lens and to direct it laterally onto an intermediate reflector disposed in said zone and oriented to direct the image upwardly toward a major reflector, said major reflector being hinged to said casing at said one end thereof and being shiftable from an operative position in which it is oriented to direct the image received from the intermediate reflector onto the rear of said erect screen along an optical path parallel to the optical axis of said projection lens, to a collapsed position in which it is folded over the top of the casing; and D. a cover for said casing, said cover being operatively linked both to said screen and said major reflector whereby when said cover is lifted it causes both said screen and said major reflector to shift to their operative positions at which point the cover extends therebetween, and when said cover is lowered it causes both said screen and said major reflector to shift to their collapsed positions, at which point the cover lies thereover to enclose said casing.
Claim 3
Dependent Claim
351 words
A compact, collapsible theatre for a standard slide projector having a box-like housing on whose front wall is mounted a projection lens that is disposed adjacent one side of the housing, said theatre comprising: A. an open top box-like casing for accommodating said projector and having a narrow zone therein at one end of the casing in advance of the front wall of the housing, the optical axis of said projection lens being parallel to the side of the casing which corresponds to said one side of said housing, said casing having a width which is substantially the same as that of said housing and a height substantially the same as that of said housing; B. a translucent screen hinged to said casing at the other end thereof and shiftable from an operative position in which the screen is erect, to a collapsed position in which the screen is folded over the top of the casing; C. a reflecting system constituted by a minor reflector disposed in said zone and oriented to receive an image from said lens and to direct it laterally onto an intermediate reflector disposed in said zone and oriented to direct the image upwardly toward a major reflector, said major reflector being hinged to said casing at said one end thereof and being shiftable from an operative position in which it is oriented to direct the image received from the intermediate reflector onto the rear of said erect screen along an optical path parallel to the optical axis of said projection lens, to a collapsed position in which it is folded over the top of the casing; and D. a cover for said casing, said cover being operatively linked both to said screen and said major reflector whereby when said cover is lifted it causes both said screen and said major reflector to shift to their operative positions at which point the cover extends therebetween, and when said cover is lowered it causes both said screen and said major reflector to shift to their collapsed positions, at which point the cover lies thereover to enclose said casing.
Claim 4
Dependent Claim
351 words
A compact, collapsible theatre for a standard slide projector having a box-like housing on whose front wall is mounted a projection lens that is disposed adjacent one side of the housing, said theatre comprising: A. an open top box-like casing for accommodating said projector and having a narrow zone therein at one end of the casing in advance of the front wall of the housing, the optical axis of said projection lens being parallel to the side of the casing which corresponds to said one side of said housing, said casing having a width which is substantially the same as that of said housing and a height substantially the same as that of said housing; B. a translucent screen hinged to said casing at the other end thereof and shiftable from an operative position in which the screen is erect, to a collapsed position in which the screen is folded over the top of the casing; C. a reflecting system constituted by a minor reflector disposed in said zone and oriented to receive an image from said lens and to direct it laterally onto an intermediate reflector disposed in said zone and oriented to direct the image upwardly toward a major reflector, said major reflector being hinged to said casing at said one end thereof and being shiftable from an operative position in which it is oriented to direct the image received from the intermediate reflector onto the rear of said erect screen along an optical path parallel to the optical axis of said projection lens, to a collapsed position in which it is folded over the top of the casing; and D. a cover for said casing, said cover being operatively linked both to said screen and said major reflector whereby when said cover is lifted it causes both said screen and said major reflector to shift to their operative positions at which point the cover extends therebetween, and when said cover is lowered it causes both said screen and said major reflector to shift to their collapsed positions, at which point the cover lies thereover to enclose said casing.
Claim 5
Dependent Claim
33 words
A theatre as set forth in claim 1, in which said major reflector is mounted on an inclined panel having side walls to shield said major reflector when it is in operative position.
Claim 6
Dependent Claim
24 words
A theatre as set forth in claim 1, wherein said screen is held within a frame having legs extending therefrom to block ambient light.
Claim 7
Dependent Claim
26 words
A theatre as set forth in clAim 1, wherein said cover has side walls which shade the interior of said casing when said cover is lifted.
Claim 8
Dependent Claim
109 words
A theatre as set forth in claim 1, wherein the linkage between said cover and both said screen and said major reflector includes a lever arm, one end of which is pivotally connected to said cover, a point adjacent the other end being pivotally connected to a fulcrum mounted on the base of said casing, said arm being tilted upwardly when said cover is lifted, said screen being coupled to said arm by a first link member and said major reflector being coupled to said arm by a second link member whereby when said arm is tilted, said screen and said major reflector are shifted to their operative positions.
Claim 9
Dependent Claim
109 words
A theatre as set forth in claim 1, wherein the linkage between said cover and both said screen and said major reflector includes a lever arm, one end of which is pivotally connected to said cover, a point adjacent the other end being pivotally connected to a fulcrum mounted on the base of said casing, said arm being tilted upwardly when said cover is lifted, said screen being coupled to said arm by a first link member and said major reflector being coupled to said arm by a second link member whereby when said arm is tilted, said screen and said major reflector are shifted to their operative positions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |