Patent GB-701889-A (GB)
Title: Improvements in and relating to photographic and kinematographic cameras
IPC: G03B19/18
Filed: 1952-06-24
Abstract: 701,889. Photographic & kinematograph cameras. BOLSEY, J. June 24, 1952, No. 15851/52. Classes 97(1) and 98(1) A camera housing has a front wall with an exposure aperture therein and a lens or filter turret mounted thereon, a shutter, mechanism in the camera housing together with blocking means operated by the turret to permit operation of the shutter only when a lens or filter is aligned with the exposure aperture. The kinematograph camera seen in front elevation in Fig. 1 has a turret 25 with lenses 27, 28, 29 movable before the exposure aperture 30. A notch 53, 54 or 55 is provided opposite each lens and when the turret is rotated from the position where a lens is in front of the exposure aperture the end of a lever 56 is driven out of the corresponding notch. The pivot 57 is coupled to another spring urged lever carrying a stop which is thereby moved into the path of the shutter shown in Fig. 5, a section of the camera. The shutter blade 65 carries two pins 110, 111 at different radii. The operating lever 95 can pivot at 104 and also about a transverse axis. It carries a rearward projection 96 and a projection 97 extending rearwardly and laterally. In the normal rest position the lever is upright with the projection 96 retaining the pin 111. Pressure on the end 113 rotates the lever about the transverse axis to depress the end 113 into a notch 114 and against a spring to release the pin, 111 to permit continuous shutter rotation for kinematograph exposure, stopped by releasing the lever which is returned to its position by the spring. Rotation of the lever to the position shown releases the pin 111 from the projection 96 so that the shutter rotates clockwise to the position shown where the pin 111 is retained by the projection 97, making a single exposure. When the lever is returned to its normal position the shutter completes its rotation, the pin 111 being again retained by the projection 96. If the lever is rotated clockwise the pin 111 is released and the shutter makes rather less than half a rotation until the pin 110 is retained by the projection 97, leaving the exposure aperture open for time exposure, terminated by returning the lever to normal. A filter disc is mounted within the camera and is rotatable by the projecting periphery 40. Colour markings to indicate the filter in use are visible through an aperture 49 and co-operating apertures 50, 51 in the lens turret. A rotatable grey wedge 76, Fig. 4, is geared by rack and pinion to a sliding bar 81 the lower part 89 of which is hinged at 90 and may be folded over outside the casing to retain the bar in its lowest position. The bar may be actuated from the camera mechanism through a pinion 121 and pinions 122, 123 brought into mesh with the rack teeth 126 altermatively by movement of a lever 120 to produce alternative direc-. tions of movement of the bar 8.1 for fading in or out. The position of the grey wedge is indicated by the member 91 in the view finder field. In another embodiment members 246, 245, Fig. 15, which project from the camera front, which are pressed inwards to start and stop the camera respectively, are connected by a pivoted link 247. When the lens turret is moved a roller on a pivoted lever is driven out of a notch on the turret periphery. Part of the lever enters the notch 250 to prevent actuation of the camera. A similar interlock, using the notch 249, is provided with a rotatable knob geared to a rotatable shutter disc.