US3051040A - Projection cabinet - Google Patents

Projection cabinet Download PDF

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US3051040A
US3051040A US803991A US80399159A US3051040A US 3051040 A US3051040 A US 3051040A US 803991 A US803991 A US 803991A US 80399159 A US80399159 A US 80399159A US 3051040 A US3051040 A US 3051040A
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cabinet
mirror
projector
platform
construction
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Hubert J Davis
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen

Definitions

  • This invention relates to projectors, and more in particular to projector cabinets having screens upon which moving pictures or slides are projected for viewing without the necessity for darkening the viewing area.
  • An object of this invention is to provide an improved projector cabinet.
  • a further object is to provide a simple and compact projector cabinet which is adapted for use under a wide variety of conditions which are encountered in schools, clubs, churches and business organizations.
  • a further object is to provide for a projector system which is simple, compact and readily movable.
  • a further object is to provide a cabinet which may be used to store a slide or moving picture projector, and which may be quickly converted for projection in a lighted room or area.
  • a further object is to provide for the above with structure which is practical in every respect, and which is free of difficulties which have been encountered with prior cabinets and arrangements.
  • FIGURE 1 is a perspective view of a projector cabinet constituting one embodiment of the invention arranged for operation;
  • FIGURE 2 is a front elevation of the cabinet of FIGURE 1 in closed condition
  • FIGURE 3 is a vertical section of the cabinet in operating position, but showing in broken lines the positions of the collapsed internal parts.
  • a sheet metal cabinet 2 is supported by four casters 4 mounted upon the bottom cabinet wall 6.
  • the cabinet has side walls 8, a top wall 1i) and a rear wall 12.
  • the front wall of the cabinet is formed by three doors 14, 16 and 18.
  • Doors 14 and 16 are hinged at the respective sides of the cabinet and, when closed, door 16 overlaps a flange 20 on door 14.
  • Door 18 is hinged at the bottom and has a flange 22 which (see FIGURE 3) is overlapped by doors 14 and 16 when the doors are closed.
  • Door 16 has a lock 24 by which this door may be locked closed. The overlapping relationship between the doors prevents opening any of the doors when door 16 is locked.
  • a projection screen 28 Mounted across the front of the cabinet at the top in a frame 26 is a projection screen 28, and directly beneath screen 23 is a fixed metal panel 39 in which a speaker or amplifier 32 is mounted. Speaker 32 is used to produce sound from movies or from a microphone pickup.
  • a projector platform 34- which is supported at its sides by a pair of channel track assemblies 36 and 38.
  • Platform 34- is slidable in the channels, but it is supported at each side in its channel assembly by a pair of rollers 39' resting upon the bottom flanges of the chan-
  • Each of the channel track assemblies (see FIG- URE 3) is formed by a fixed track channel 40 mounted to the adjacent cabinet side wall by a pair of brackets 2 and a pair of movable track channels 44 and 46.
  • Each of the channels 44' is hinged to its fixed channel 4% by a pivot bolt 48, and to its adjacent channel 46 by a pivot bolt 50.
  • the opposite end of channel 46 is similarly attached by a pivot bolt 52 to a bracket 54 Welded to the hinged door 18. Hence, when door 18 is swung to its closed position, the channels 44 and 46 are moved to the broken line positions shown.
  • Channel 46 has a stop extension 56 which insures the proper alignment of the channele when door 18 is in the full-line, open position of FIGURES 1 and 3.
  • the flanges on the channels are cut away adjacent the pivots, where necessary, to permit the hinging or swinging movement indicated.
  • the channel tracks extend from the rear of the cabinet to the front or upper edge of door 18, and
  • Platform 34 is shown supporting a moving picture projector 60 having film reels 61 and 63. Reel 61 is swung down when the projector is to be slid into the cabinet.
  • the projection system is shown best in FIGURE 3, the lens 62 of the projector being represented in the position which it would occupy with the projector slid from the cabinet.
  • Three mirrors-64, 66 and 68 reflect the enlarging light beam from the lens 62 to the projection screen 28.
  • the broken line 70 represents the center of the light beam, and the mirrors are of progressively enlarged sizes to accommodate the enlarging light beam.
  • Mirrors 64 and 68 are rigidly supported by brackets 72 and 74 welded to the rear cabinet wall 12.
  • Mirror 66 is hinged at its upper edge to a pair of brackets 76, and it is attached at its lower edge through a rod 78 and an adjustable bracket 80 to platform 3'4.
  • a thumb nut 82. may be loosened to move the bracket as desired.
  • a hinge connection is provided by the rod '73 and the lower edge of the mirror by a hook 84 on the end of the rod and a hole in the flange of the mirror frame.
  • a pair of handles 88 are mounted upon doors 14 and 16 adjacent their hinges. These handles are grasped to push or pull the cabinet when the cabinet is to be moved.
  • the View on the screen from the front of the cabinet is proper in every respect. That is, the three mirrors provide the zigzag path for the beam of light and project the view on to the back of the screen.
  • the view from the front of the screen is then larger, but otherwise the same as the view which is produced on mirror 64. That is, the view from the front of the screen 28 is the same as it would be if the beam were projected directly onto the front of a screen.
  • the distance between the lens 62 and the screen is proper to produce an image of the size of screen 23.
  • the projector may be moved on platform 34, and lens adjustments may be made to give proper focus and proper size of the image.
  • the room need not be darkened, and the cabinet may be moved from room to room, or from one portion of the room to another.
  • the projector and the screen are safely locked within the cabinet, and yet the cabinet may be opened and the projector pulled out for immediate use.
  • a projection cabinet comprising, a casing construction, a viewing screen mounted at one side of said casing construction with its viewing surface exposed to view from the side of the cabinet construction and with the other surface exposed for projecting a light beam thereon, a plurality of mirrors providing a reflecting and enlarging path for a light beam from a first mirror at the lower portion of said cabinet construction upwardly in zigzag fashion and onto said other surface of said screen, a sliding platform which is adapted to support a projector in a position to project a light beam onto said first mirror and thence along said path, a collapsible track assembly providing support for said platform and permitting a projector to be moved to and from said first mirror whereby said projector is moved in between a projecting position outside of said cabinet construction and a nested position adjacent said first mirror and within said cabinet construction, and a door hinged along its bottom edge to the lower portion of said cabinet construction and adapted to provide support for said track assembly and said platform when said door is in its open position, said door being effective to close
  • a projection cabinet as described in claim 1, wherein said plurality of mirrors comprises, a first mirror rigidly mounted in alignment with a light beam from said projector, a second mirror in alignment with a light beam reflected from said first mirror and swingably supported beneath the level of said screen, and a third mirror rigidly supported at substantially the level of said screen and positioned to project a light beam from said second mirror onto said screen.
  • a projection cabinet as described in claim 1 which includes a second mirror and an operating arm connecting said second mirror to said platform to swing said second mirror upwardly when said platform is moved into the cabinet construction.
  • a projection cabinet comprising: a casing construction; a viewing screen mounted at one side of said casing construction with its viewing surface exposed to view from the side of the cabinet construction and with the other surface exposed for projecting a light beam thereon; a plurality of mirrors providing a reflecting and enlarging path for a light beam from a first mirror at the lower portion of said cabinet construction upwardly in zigzag fashion and onto said other surface of said path; a collapsible track assembly providing support for said platform and permitting a projector to be moved to and from said first mirror whereby said projector is moved in between a projecting position outside of said cabinet construction and a nested position adjacent said first mirror and within said cabinet construction; an operating arm connecting said second mirror to said platform to swing said second mirror upwardly when said platform is moved into the cabinet construction; and a door hinged along its bottom edge to the lower portion of said cabinet construction and adapted to provide support for said track assembly and said platform when said door is in its open position, said door being effective to close the lower portion of the cabinet construction when
  • a projection cabinet comprising: a casing construction; a viewing screen mounted at one side of said casing construction with its viewing surface exposed to view from the side of the cabinet construction and with the other surface exposed for projecting a light beam thereon; a plurality of mirrors providing a reflecting enlarging path for a light beam from a first mirror at the lower portion of said cabinet construction upwardly in zigzag fashion and onto said other surface of said screen, said plurality of mirrors including a first mirror rigidly mounted in alignment with a light beam from said projector and a second mirror in alignment with a light beam reffected from said first mirror and swingably supp rted beneath the level of said screen; a sliding projector assembly which is adapted to be positioned to project a light beam onto said first mirror and thence along said path; a collapsible track assembly providing support for said platform assembly and permitting the projector assembly to be moved to and'froni said first mirror whereby said projector is moved in between a projecting position outside of said cabinet construction and a nested

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Description

Aug. 28, 1962 Filed April 3, 1959 [Humid (ll I H. DAVIS PROJECTION CABINET 2 Sheets-Sheet 1 lllu INVENTOR fluaewrJDAwa ATTo Aug. 28, 1962 H. J. DAVIS 3,051,040
PROJECTION CABINET Filed April 5, 1959 2 Sheets-Sheet 2 INVENTOR #05547- JDA v1;
BY M, m g 'g/ Y nels.
3,051,040 Patented Aug. 28,1962
r 3,051,040 PROJECTION CABINET Hubert J. Davis, 143 Carolina Ave., Portsmouth, Va. Filed Apr. 3, 1959, Ser. No. 803,991
' Claims. (Cl. 8824) This invention relates to projectors, and more in particular to projector cabinets having screens upon which moving pictures or slides are projected for viewing without the necessity for darkening the viewing area.
An object of this invention is to provide an improved projector cabinet. A further object is to provide a simple and compact projector cabinet which is adapted for use under a wide variety of conditions which are encountered in schools, clubs, churches and business organizations. A further object is to provide for a projector system which is simple, compact and readily movable. A further object is to provide a cabinet which may be used to store a slide or moving picture projector, and which may be quickly converted for projection in a lighted room or area. A further object is to provide for the above with structure which is practical in every respect, and which is free of difficulties which have been encountered with prior cabinets and arrangements. These and other objects will be in part obvious, and in part pointed out below.
In the drawings:
FIGURE 1 is a perspective view of a projector cabinet constituting one embodiment of the invention arranged for operation;
FIGURE 2 is a front elevation of the cabinet of FIGURE 1 in closed condition; and,
FIGURE 3 is a vertical section of the cabinet in operating position, but showing in broken lines the positions of the collapsed internal parts.
Referring to the drawings, a sheet metal cabinet 2 is supported by four casters 4 mounted upon the bottom cabinet wall 6. The cabinet has side walls 8, a top wall 1i) and a rear wall 12. The front wall of the cabinet is formed by three doors 14, 16 and 18. Doors 14 and 16 are hinged at the respective sides of the cabinet and, when closed, door 16 overlaps a flange 20 on door 14. Door 18 is hinged at the bottom and has a flange 22 which (see FIGURE 3) is overlapped by doors 14 and 16 when the doors are closed. Door 16 has a lock 24 by which this door may be locked closed. The overlapping relationship between the doors prevents opening any of the doors when door 16 is locked.
Mounted across the front of the cabinet at the top in a frame 26 is a projection screen 28, and directly beneath screen 23 is a fixed metal panel 39 in which a speaker or amplifier 32 is mounted. Speaker 32 is used to produce sound from movies or from a microphone pickup.
Slidably mounted in the lower portion of the cabinet is a projector platform 34- which is supported at its sides by a pair of channel track assemblies 36 and 38. Platform 34- is slidable in the channels, but it is supported at each side in its channel assembly by a pair of rollers 39' resting upon the bottom flanges of the chan- Each of the channel track assemblies (see FIG- URE 3) is formed by a fixed track channel 40 mounted to the adjacent cabinet side wall by a pair of brackets 2 and a pair of movable track channels 44 and 46. Each of the channels 44' is hinged to its fixed channel 4% by a pivot bolt 48, and to its adjacent channel 46 by a pivot bolt 50. The opposite end of channel 46 is similarly attached by a pivot bolt 52 to a bracket 54 Welded to the hinged door 18. Hence, when door 18 is swung to its closed position, the channels 44 and 46 are moved to the broken line positions shown.
Channel 46 has a stop extension 56 which insures the proper alignment of the channele when door 18 is in the full-line, open position of FIGURES 1 and 3. The flanges on the channels are cut away adjacent the pivots, where necessary, to permit the hinging or swinging movement indicated. Hence, with door 18 in its full-line, open position, the channel tracks extend from the rear of the cabinet to the front or upper edge of door 18, and
the platform may be moved to and from the external position shown in full lines. When the cabinet is to be closed, the platform is moved back so that it is supported solely by the fixed channels 40. Platform 34 is shown supporting a moving picture projector 60 having film reels 61 and 63. Reel 61 is swung down when the projector is to be slid into the cabinet.
The projection system is shown best in FIGURE 3, the lens 62 of the projector being represented in the position which it would occupy with the projector slid from the cabinet. Three mirrors-64, 66 and 68 reflect the enlarging light beam from the lens 62 to the projection screen 28. The broken line 70 represents the center of the light beam, and the mirrors are of progressively enlarged sizes to accommodate the enlarging light beam. Mirrors 64 and 68 are rigidly supported by brackets 72 and 74 welded to the rear cabinet wall 12. Mirror 66 is hinged at its upper edge to a pair of brackets 76, and it is attached at its lower edge through a rod 78 and an adjustable bracket 80 to platform 3'4. A thumb nut 82. may be loosened to move the bracket as desired. A hinge connection is provided by the rod '73 and the lower edge of the mirror by a hook 84 on the end of the rod and a hole in the flange of the mirror frame. When platform 34 is moved into the cabinet, rod 78 swings mirror 66 to the broken line position, thus to move the mirror upwardly away from the projector. Platform 34 has a rectangular opening 86 into which a projector reel may be positioned.
Referring again to FIGURE 1, a pair of handles 88 are mounted upon doors 14 and 16 adjacent their hinges. These handles are grasped to push or pull the cabinet when the cabinet is to be moved.
With the projection cabinet of the present invention, the View on the screen from the front of the cabinet is proper in every respect. That is, the three mirrors provide the zigzag path for the beam of light and project the view on to the back of the screen. The view from the front of the screen is then larger, but otherwise the same as the view which is produced on mirror 64. That is, the view from the front of the screen 28 is the same as it would be if the beam were projected directly onto the front of a screen. The distance between the lens 62 and the screen is proper to produce an image of the size of screen 23. The projector may be moved on platform 34, and lens adjustments may be made to give proper focus and proper size of the image.
With the projection cabinet as herein disclosed, the room need not be darkened, and the cabinet may be moved from room to room, or from one portion of the room to another. The projector and the screen are safely locked within the cabinet, and yet the cabinet may be opened and the projector pulled out for immediate use. 7
As many possible embodiments may be made of the above invention and as the art herein described might be varied in various parts, all without departing from the scope of the invention, it is to be understood that all matter hereinabove set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.
I claim:
1. A projection cabinet comprising, a casing construction, a viewing screen mounted at one side of said casing construction with its viewing surface exposed to view from the side of the cabinet construction and with the other surface exposed for projecting a light beam thereon, a plurality of mirrors providing a reflecting and enlarging path for a light beam from a first mirror at the lower portion of said cabinet construction upwardly in zigzag fashion and onto said other surface of said screen, a sliding platform which is adapted to support a projector in a position to project a light beam onto said first mirror and thence along said path, a collapsible track assembly providing support for said platform and permitting a projector to be moved to and from said first mirror whereby said projector is moved in between a projecting position outside of said cabinet construction and a nested position adjacent said first mirror and within said cabinet construction, and a door hinged along its bottom edge to the lower portion of said cabinet construction and adapted to provide support for said track assembly and said platform when said door is in its open position, said door being effective to close the lower portion of the cabinet construction when said platform is moved into said cabinet construction.
2. A projection cabinet as described in claim 1, wherein said plurality of mirrors comprises, a first mirror rigidly mounted in alignment with a light beam from said projector, a second mirror in alignment with a light beam reflected from said first mirror and swingably supported beneath the level of said screen, and a third mirror rigidly supported at substantially the level of said screen and positioned to project a light beam from said second mirror onto said screen.
3. A projection cabinet as described in claim 1 which includes a second mirror and an operating arm connecting said second mirror to said platform to swing said second mirror upwardly when said platform is moved into the cabinet construction.
4. A projection cabinet comprising: a casing construction; a viewing screen mounted at one side of said casing construction with its viewing surface exposed to view from the side of the cabinet construction and with the other surface exposed for projecting a light beam thereon; a plurality of mirrors providing a reflecting and enlarging path for a light beam from a first mirror at the lower portion of said cabinet construction upwardly in zigzag fashion and onto said other surface of said path; a collapsible track assembly providing support for said platform and permitting a projector to be moved to and from said first mirror whereby said projector is moved in between a projecting position outside of said cabinet construction and a nested position adjacent said first mirror and within said cabinet construction; an operating arm connecting said second mirror to said platform to swing said second mirror upwardly when said platform is moved into the cabinet construction; and a door hinged along its bottom edge to the lower portion of said cabinet construction and adapted to provide support for said track assembly and said platform when said door is in its open position, said door being effective to close the lower portion of the cabinet construction when said platform is moved into said cabinet construction.
5. A projection cabinet comprising: a casing construction; a viewing screen mounted at one side of said casing construction with its viewing surface exposed to view from the side of the cabinet construction and with the other surface exposed for projecting a light beam thereon; a plurality of mirrors providing a reflecting enlarging path for a light beam from a first mirror at the lower portion of said cabinet construction upwardly in zigzag fashion and onto said other surface of said screen, said plurality of mirrors including a first mirror rigidly mounted in alignment with a light beam from said projector and a second mirror in alignment with a light beam reffected from said first mirror and swingably supp rted beneath the level of said screen; a sliding projector assembly which is adapted to be positioned to project a light beam onto said first mirror and thence along said path; a collapsible track assembly providing support for said platform assembly and permitting the projector assembly to be moved to and'froni said first mirror whereby said projector is moved in between a projecting position outside of said cabinet construction and a nested position adjacent said first mirror and within said cabinet construction; an operating arm connecting said second mirror to said platform assembly to swing said second mirror upwardly when said platform assembly is moved into the cabinet construction; and a door hinged along its bottom edge to the lower portion of said cabinet construction and adapted to provide support for said track assembly and said platform assembly when said door is in its open position, said door being effective to close the lower portion of the cabinet construction when said platform assembly is moved into said cabinet construction.
References (lit-ed in the file of this patent UNITED STATES PATENTS 1,918,468 Harding July 18, 1933 1,954,786 Bright et al Apr. 17, 1934 1,954,787 Bright et al Apr. 17, 1934 2,231,395 Schlegel Feb. 11, 1941 2,322,023 Hopkins June 15, 1943 2,498,895 Mueller et al Feb. 28, 1950 2,566,830 Goldsmith Sept. 4, 1951 2,863,356 Goldberg Dec. 9, 1958 FOREIGN PATENTS 147,595 Austria Nov. 10, 1936
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199403A (en) * 1962-06-07 1965-08-10 Frank N Moore Projection system
US3283652A (en) * 1965-02-15 1966-11-08 Busch Edwin Modular multiple screen film projection systems
US3332317A (en) * 1965-05-19 1967-07-25 E H Sheldon & Company Chalk screen image projector
US3475087A (en) * 1966-02-09 1969-10-28 Edwin Busch Film projection apparatus
US3535033A (en) * 1968-01-11 1970-10-20 Edwin Busch Multiple unit projection system
FR2280917A1 (en) * 1974-08-01 1976-02-27 Hamelle Michel Slide projector with combined translucent screen - has optical system behind screen and projector in sliding drawer
US4135784A (en) * 1977-08-10 1979-01-23 Larrick Robert B Rear screen optic projection apparatus
US4652100A (en) * 1986-04-28 1987-03-24 Medbury Seward J Image acquisition system and modular desk utilized therein
WO1987001823A1 (en) * 1985-09-23 1987-03-26 Bernard Bouteille Device for the projection of video images on a screen with daylight and/or artificial so-called make-up light
FR2596879A1 (en) * 1986-04-02 1987-10-09 Prestinox Sa Apparatus for projecting rectangular microfiches

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1918468A (en) * 1929-03-13 1933-07-18 George L Brown Sr Condensed cataloging and projecting machine
US1954786A (en) * 1931-03-12 1934-04-17 James J Bright Stray light eliminating and picture cabinet enlarging device
US1954787A (en) * 1931-02-12 1934-04-17 James J Bright Moving picture cabinet enlarging device
AT147595B (en) * 1934-08-29 1936-11-10 Bosch Robert Box cinema.
US2231395A (en) * 1939-06-03 1941-02-11 Volney A Searles Photographic cabinet
US2322023A (en) * 1941-11-26 1943-06-15 Eastman Kodak Co Device for exhibiting transparencies
US2498895A (en) * 1947-11-22 1950-02-28 Warner Brothers Pictures Inc Projection film viewer and reproducing system
US2566830A (en) * 1946-10-12 1951-09-04 Rca Corp Cabinet for television receivers
US2863356A (en) * 1951-08-30 1958-12-09 Ernest W Goldberg Shiftable film bed and optical system for projectors

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1918468A (en) * 1929-03-13 1933-07-18 George L Brown Sr Condensed cataloging and projecting machine
US1954787A (en) * 1931-02-12 1934-04-17 James J Bright Moving picture cabinet enlarging device
US1954786A (en) * 1931-03-12 1934-04-17 James J Bright Stray light eliminating and picture cabinet enlarging device
AT147595B (en) * 1934-08-29 1936-11-10 Bosch Robert Box cinema.
US2231395A (en) * 1939-06-03 1941-02-11 Volney A Searles Photographic cabinet
US2322023A (en) * 1941-11-26 1943-06-15 Eastman Kodak Co Device for exhibiting transparencies
US2566830A (en) * 1946-10-12 1951-09-04 Rca Corp Cabinet for television receivers
US2498895A (en) * 1947-11-22 1950-02-28 Warner Brothers Pictures Inc Projection film viewer and reproducing system
US2863356A (en) * 1951-08-30 1958-12-09 Ernest W Goldberg Shiftable film bed and optical system for projectors

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3199403A (en) * 1962-06-07 1965-08-10 Frank N Moore Projection system
US3283652A (en) * 1965-02-15 1966-11-08 Busch Edwin Modular multiple screen film projection systems
US3332317A (en) * 1965-05-19 1967-07-25 E H Sheldon & Company Chalk screen image projector
US3475087A (en) * 1966-02-09 1969-10-28 Edwin Busch Film projection apparatus
US3535033A (en) * 1968-01-11 1970-10-20 Edwin Busch Multiple unit projection system
FR2280917A1 (en) * 1974-08-01 1976-02-27 Hamelle Michel Slide projector with combined translucent screen - has optical system behind screen and projector in sliding drawer
US4135784A (en) * 1977-08-10 1979-01-23 Larrick Robert B Rear screen optic projection apparatus
WO1987001823A1 (en) * 1985-09-23 1987-03-26 Bernard Bouteille Device for the projection of video images on a screen with daylight and/or artificial so-called make-up light
FR2587811A1 (en) * 1985-09-23 1987-03-27 Bouteille Bernard DEVICE FOR PROJECTING VIDEO IMAGES ONTO LIGHT OF DAY OR / AND ARTIFICIAL LIGHT ADDITIONAL SCREEN
FR2596879A1 (en) * 1986-04-02 1987-10-09 Prestinox Sa Apparatus for projecting rectangular microfiches
US4652100A (en) * 1986-04-28 1987-03-24 Medbury Seward J Image acquisition system and modular desk utilized therein

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