Patent GB-190328792-A (GB)
Title: New or Improved Means for Attaching to Photographic Shutters Mechanism for the Transmission of Power in Varying Directions for the Purpose of Releasing or Operating such Shutters
Inventor: WATSON CHARLES HENRY
Filed: 1903-12-31
Granted: 1904-11-10
Abstract: 28,792. Watson, C. H., and Edwards, A. H. Dec. 31. Shutters.-Apparatus for attaching, to photographic shutters, releasing- mechanism of the type described in Specifications No. 25,325, A.D. 1896, Nos. 12,639 and 12,812, A.D. 1901, [Abridgment Class Mechanism &c.], and No. 5047, A.D. 1903, comprises, for shutters of the non-capping type, such as the Bausch and Lomb "Unicum" shutter, a sleeve 2, Fig. 1, attaching the outer sliding part A to the pneumatic cylinder 1, while the inner sliding part A<1> is looped by an eye 7 over the shutter-operating lever B. In modified forms, when the cylinder 1 is dispensed with, the outer part A, Fig. 9, may move against a spring 11 within a guide cylinder 9, to which the inner part A' is fixed. A rod 10 attached to the outer part A actuates the shutter. The cylinder 9 may be adjustably mounted on the shutter case by a clamping-screw, or by means of spring clips engaging between collars on the cylinder; or adjustability may be obtained by engaging the shatter-operating lever in one of several holes in the rod 10. The inner part A', Fig. 1, may have a protective covering, and may be adjustable as to length by a screwed portion engaging with a bored screwed portion of the part A<1>; or chain links forming part of the inner portion A<1> maybe taken up to adjust the length. The attachment for roller-blind shutters of the Thornton-Pickard type, Fig. 11, comprises the outer part A fixed to the shutter case, while the inner part A' is attached to the bell-crank lever 21, which acts against stops on the disc 18. In roller-blind shutters of the " studio " type, the moving inner part A', Fig. 13, is attached to a cord passing over a friction roller 26, and around the blind roller ; or the cord may pass directly from the part A' around the blind roller ; or either the inner part A<1> or the outer part A may carry a pulley 64, Fig. 29, over which a cord 24 passes to the blind roller, the cord being fixed at the other end 65 so that the blind has a magnified motion. In all cases either the inner part A' or the outer part A is fixed to the shutter case. In another form, Fig. 19, the part A' carries a pulley 37, from which a cord 35 fixed at one end 36 passes round a pulley 34 on the blind roller, which thus receives a magnified motion. A studio shutter of the hemispherical or bellows type, Fig. 24, is actuated by the depression of a vertically-sliding plate 43, actuating cranks 47 through rods 46. The plate 43 is depressed by a cord fixed at one end 51 passing over a pulley 49 on the plate 43, and attached to the inner part A'; or the plate 43 may be depressed by direct connection with the part A' ; or the plate 43 may be dispensed with by attaching the cranks 47, Fig. 27, by connecting-rods 57 to a sliding piece attached to the inner part A<1>. In this form, flexible cords may replace the rods 57, and pass over circular arcs on the ends of the cranks 47. The motion of the part A' may be magnified by a simple lever. The Provisional Specification also states that a timing dash-pot may be added.