GB365753A - Photographic shutter of the pivoted blade, symmetrical opening type - Google Patents

Abstract

365,753. Photographic shutters.- BAR•NYI, A., 12, Ringstrasse, Lichterfelde, Berlin. Dec. 29, 1930, No. 39039. Convention date, Jan. 9. [Class 98 (i).] In photographic shutters of the pivoted blade symmetrical opening type in which the blades are opened and closed by a master member rotating always in one direction and driven by a spring member controlled by pawls, the pawls are mounted on a plate which is rockable to enable time and bulb exposures to be made without setting the spring member. In the form shown the pawls 5, 7 controlling the spring member are mounted on a plate 8 connected by a link 10 with the operating lever 14. A pivoted detent 27 having a hooked end 30 to engage a pin 12 on the link 10 is mounted below the lever 14. For bulb exposures the lever 14 is drawn down, bringing the plate 8 into the position shown, the pawls rotating the spring member to open the shutter and retaining this open until the lever 14 is released. For time exposures a setting ring 24 is rotated releasing the detent 27 from a shoulder 25 by which it is normally engaged. On operating the lever 14 the hooked end 30 of the detent engages the pin 12 on the link 10 and retains this in position when the lever 14 is released. On again operating the lever 14 a pawl 18 releases the arm 10 and the shutter closes. For instantaneous exposures a stop (not shown) on the setting ring holds the plate 8 from moving.