Patent GB-208166-A (GB)
Title: Improvements in or relating to photographic cameras
IPC: G03B9/08
Filed: 1923-12-08
Abstract: 208,166. Bayle, H. C. G., and Houssin, V. A. Dec. 11, 1922, [Convention date]. Shutters with pivoted. blades; shutters with sliding plates.-In a camera of the kind provided with a lens shutter and a focal plane shutter operated successively from a single button, the focal plane shutter consists of rigid blades of metal, ebonite, &c. separated by a slit of adjustable width. In the form shown, the camera comprises a body of trapezium section, Fig. 2, the front of which is recessed at X<1> to receive the objective. Behind the lens recess X<1> is a shutter having two blades A, Fig. 1 turning on rods B, and actuated from a release button X through levers E, D and a pin C on the lever D, this lever carrying a return spring F. In front of the focal plate is a second shutter comprising two plates Q, Fig. 2, carried by racks N, Fig. 3, which slide on rails O above and below the casing P, and engage respectively gear wheels L, L<1>, on a spindle M carrying and actuating spring R, and setting handle G. The wheel L<1> is fast with the spindle M. and the wheel L is loose thereon. The lever G carries a disc bearing indications of the width of the gap between the plates Q, and has a pin J normally pressed into one or other of a set of slots in a disc H on the wheel L by a spring K, thus locking the wheel L to the spindle M. Finger-pressure on the end of the lever G engaged by the spring K releases the pin J in order that the spindle M may be rotated, carrying with it the wheel L<1> but not the wheel L, to adjust the width of the gap between the plates Q. The shutter is wound by rotating the handle G and is held by a spring V, Fig. 2, engaging the teeth of a wheel T geared to the spindle M and to a flywheel U. The spring V is displaced to release the shutter, after the blade shutter A has been opened, by a bellcrank lever Y actuated by the spring F. The focal plane shutter may be set open and rendered inoperative for time exposures, which are then made by the blade shutter, operated on pressure and release of the button X. An antinous release may be fitted to the button X. The Specification as open to inspection under Sect. 91 (3) (a) also comprises :- Magazine hand cameras for roll films; roller slides and roll spools.-The camera is designed to make single exposures on perforated kinematograph film strip, which is carried on spools each comprising a tube A<1>, Fig. 14 (Cancelled), mounted on a fixed pivot E' and a rotary pivot. E\ on the camera body. The pivot E<1> of each spool is designed to grip the tube frictionally, and the pivot E<1>1 is made hollow to receive a detachable winding-key I'. To the tubes A<1> are glued leather tabs B<1>, Fig. 2, carrying hooks D<1> adapted to engage the end perforations on each side of the sensitive film, this construction allows theexposed postition of the film to be detached for development, &c. A counting-mechanism in thecamera back comprises a ratchet wheel n, Fig.. 10 (Cancelled), held by a spring-pawl o and driven through a spring-pawl r by a lever p pivoted to. the back at c and connected at t to a bar s which is slidable parallel to the film and carries a spring- blade v having a pin w passing through a slot y in a fixed plate x into engagement with the perforations of the film. As this is wound after exposure, the perforation engaging the pin w draws the slide s along, against the action of the spring u, until the pin strikes the end of the slot v, whereupon the pin w is disengaged from the perforation and the slide a returns far enough to allow the pin to engage the next perforation. This operation is repeated until the requisite number of perforations, as indicated on an outer dial, has passed the slot. The film is maintained flat in its passage across the exposure aperture by marginal guides engaging opposite sides of the film, and the plate carrying these guides and the film guide rollers is offset from the plane of the film to prevent scratching. The film back is supported by the plate x, which is blackened to prevent halation. The camera back is secured to. the body by special looking bolts o<1>. Finders. - The finder, Fig. 2, comprises. a plate Z hinged at c to the camera body, and two members, W, W<1>, hinged at e<1>, e<2> to the plate Z, the three elements carrying respectively a mirror Z<1>, a concave lens a, and a convex lens # serving as eyepiece. In the operative position 1, the members W, W<1> are. held at a right angle to each ether by stops b, b<1>, and the plate Z rests against the camera body, the line of sight into the eyepiece being at right angles to the optic axis of the camera. The finder folds away into position 3, being caused to collapse during folding by a fixed projection a. The hinges of the three elements carry springs. which throw the finder out into position 1 when a catch d is released. This subject-matter does. not appear in the Specification as accepted.