Patent GB-615569-A (GB)
Title: Improvements in or relating to means or apparatus for displaying advertisements and the like, for lighting, and for other uses in illumination
IPC: G09F19/18
Filed: 1946-05-25
Abstract: 615,569. Light projectors. KAVANAGH, P. May, 25, 1946, No. 15922. [Class 75 (iv)] [Also in Groups XVIII and XX] An apparatus for displaying image advertisements comprises stencil plates, film or the like presented step-by-step between a lighting means including a reflector and a lens or lenses which are movable at right angles to the reflector axis, a glass or like prism being situated beyond the lens or lenses. As shown in Fig. 7, a casing 9, having a transparent section 9a is mounted on a board 3 which is hinged to a baseboard 4. The boards 3, 4 are tapered at the end remote from the hinge, and a roller 6 mounted between them on an L-shaped frame 7 can be moved transversely to separate the boards by means of a travelling-nut mechanism 10, 11 which engages an abutment on the frame 7. Inside the casing and bolted to the board 3 is a base frame 2 carrying two side frames I on which are journalled stub axles 13, Fig. 6. The axles 13 are fixed to a rectangular frame 14 which has two depending cheeks 15, one of which has teeth engaged by a worm 16a, operated by a control rod 16 for moving the frame 14. A hollow axle 19 is fixed to one of the cheeks 15 and the other journals an axle 18 to which is fixed a skeleton drum 20 of hexagonal or other shape. The other side of the drum rotates on axle 19. The drum 20 has transverse spacing members 21 between which detachable stencil plates 22 are fixed ; they are located by a lip on one member and a turn-button on the next and may be framed if desired. The drum 20 is driven by an electric motor 32 in a step-by-step or other fashion through the axle 18. Inside the' drum, loosely mounted on axle 18 and fixed to axle 19 is an apertured tray 26 with side frames 25. It carries a parabolic reflector 28 and a lamp holder 30. The lamp holder is supplied with current by a flexible lead 33 passing through axle 19. The frame 14 carries an apertured tray 37 to which are attached light screens 38. Slidably mounted on the tray 37 is a pair of light screens 40 to which are fixed a rectangular casing 41. A screwed control rod 57 is rotatably secured to the casing 41 and is engaged by a threaded sleeve 56 attached to the frame 14. Slots 39 on the frame 14 and tray 37 permit movement of the screens 40. Slidably mounted on top of the casing 41 is a light screen 42 which by means of brackets 45 engages and moves the upper ends of light screens 44, the lower ends of which are hinged to the screens 40. The screen 42 is moved by a screw control rod 47 rotatably secured to a casing 49 which is mounted on an upper cylindrical portion of the screen 42. A lens 51 is mounted within the cylindrical part of the screen 42 and is thus laterally adjustable relative to the reflector 28. The casing 49 supports an adjustably mounted prism 52 the light beam from which passes through a transparent portion 54 of the casing. The prism may be mounted so that it is angularly as well as rotatably adjustable. The size of the light aperture below the prism may be controlled by removable plates having openings of different sizes or by an adjustable iris of the camera type. An additional lens may be mounted in the aperture of the tray 37. A stationary stencil or film may be substituted for the drum and without a stencil the device may be used for flood lighting. The prism may be continuously rotated.