GB523134A - Improvements in or relating to photographic shutters - Google Patents

Abstract

523,134. Photographic shutters. KODAK, Ltd. March 3, 1939, No. 6980. Convention date, March 4, 1938. [Class 98 (i)] Means for preventing rebound of the blades of a shutter of the type having a setting lever for tensioning the master member and symmetrically pivoted shutter blades which are opened and closed by oscillating a blade ring, comprises a spring latch which restrains the operating lever of the master member at the end of the exposure. The shutter blade ring 9 has a pin and slot connection 7, 8, with the pivoted blades 4, and has a lug 10 which projects through a slot 11 in the base plate 12. The lug 10 is oscillated by a latch 13 which is pivoted at 15 to the master member 16. The spring 24 of the master member is tensioned by means of the arm 23, and is held in the tensioned position by engagement of the arm 18 of the release trigger 19 with a shoulder 17 on the master member. The latch 13 is formed with two arms 27, 28, a light spring 31 engaging the arm 28 to hold the latch 13 against the lug 10. The arm 27 moves the hook end 35 of a spring, latch 30 away from the lug 10 when the latch member 13 is swung during the setting operation. When the shutter is released, the member 13 is oscillated, and the arm 27 moves away and allows the hook end 35 to engage behind the lug 10 and prevent its rebound at the end of the shutter movement.