Patent GB-191103318-A (GB)
Title: An Improved Photographic Shutter.
Inventor: COLARDEAU LOUIS JOSEPH EMMANUE
IPC: G03B9/08
Filed: 1911-02-09
Granted: 1911-10-05
Abstract: 3318. Colardeau, L. J. E., and Richard, J. Feb. 9. Shutters with sliding plates. -In a sliding-plate shutter which gives (1) time exposures, or (2) exposures regulated in advance, or (3) a rapid instantaneous exposure, a carriage l, Fig. 19, is adjustable in three positions corresponding to the exposure required. The carriage has stops r, q, n and a timeexposure lever g, Fig. 18, pivoted thereon, which operate in combination with the shutter-actuating release lever e, Fig. 16, an auxiliary release lever f, Fig. 17, and an automatic controlling-lever h, Fig. 2, connected to the piston of a dash-pot j. The shutter plates a, b, Figs. 2 and 15, are actuated by springs a<2>, b<2> attached to a fixed arm d. To set the shutter, the projecting knob b<4>, Fig. 1, on the plate b, is moved along the slot o<1> and carries the plate a with it until the projection a<6> engages the catch e<1> on the levers e. The plate b then slides back to normal position. For time exposures the plate l is moved by the projecting knob n<1>, Fig. 1, to the position marked P, when it may be held by the spring p having corresponding holes p<2> to engage' the knob n<1>. In moving to this position the spring catch m engages the corresponding notch l<1>, and the projection r moves the lever h to the left and holds it out of action. On actuating the release e<3>, the projection a<6> and plate a are released, and the plate slides sufficiently to uncover the lens aperture, and is held in this position by the projection g<4> on the lever g which has been raised by the pin e<4> and engages the stop a<5> on the slide. On releasing the lever e<3> the stop a<5> escapes from the projection g<4> and the projection a<6> is held by the projection f<1>. To complete the exposure, the release e<3> is again actuated and the end of the lever e depresses the projection f<3> of the lever f to release the stop a<6> and slide a. For exposures which are determined by the dash-pot j, the slide l is moved by the knob n<1> to the position marked +, and the catch m engages the notch l<2>. The slope g<3> slides down the pin e<4> and the lever g drops to a lower and inoperative position, and the end h<4> of the lever h abuts against the sloping end f<5> of the lever f. Also the stop q limits the downward movement of the pin e<5> and the lever e, and the projection f<3> is thus not actuated by the lever e. The shutter is set in the same way, but on actuating the release e<3>, the plate a is released from the catch e<1>, and the projection a<6> is stopped, when the lens is exposed, by the projection f<1>. The lever his, however, pulled over by the spring acting on it, and in time engages the sloping end f<5> of the lever f to release the projection a<6> and plate a. The time of exposure is adjusted by regulating the orifice k of the piston. For an instantaneous exposure, the knob n<1> is moved to the position marked I and the catch m engages the notch l<3> in the slide l. In this position the slot r<1> in the projection r engages the pin f<4> and holds the lever f down, so that on actuating the release e<3> the slide a is free to travel right across the aperture.