Patent GB-1257547-A (GB)
IPC: G03B15/04
Filed: 1969-10-02
Abstract: 1,257,547. Photographic cameras. GTE SYLVANIA Inc. Oct.2, 1969 [Oct. 3, 1968], No. 48482/69. Heading G2A. A photographic camera having a rotatable socket for receiving a flash-cube 1 containing percussive type flash-bulbs with depending primer tubes, is provided with a shutter actuating mechanism, with a torsion spring 64 including a striker 66, and with means for loading the torsion spring, the shutter actuating mechanism being arranged to release the torsion spring 64 upon depression of a shutter release plate 72 whereby in use the striker 66 strikes the primer tube of a. flash-cube lamp in the firing position to fire the lamp in synchronism with the shutter operation. The socket is indexed and the shutter cocked in dependence upon film advance. Picture taking. Depression of the plate 72 rotates a shutter release arm 74 clockwise (as seen in Fig. 2) thereby disengaging a detent 40 thereof from a finger 32 of a spring-loaded shutter striking plate 28 which is thus free to rotate counter-clockwise, Fig.1, a tab 36 thereof displacing a striker latch arm 43 to the right. This allows a striker latch 44 to rotate out of engagement with the striker 66 which operates as described above. Clockwise movement of the arm 74 results in a finger 88 thereof displacing a pin 60 downwards out of contact with a spring-loaded pawl 56 which can thus mesh with a ratchet 54. Also a latch tripping spring 92 moves downwards and rotates clockwise Fig. 2 so that a hook 93 thereof is beneath a cocking latch (110) Figs.3-5 (not shown). When plate 72 is released, allowing the arm 74 to rise, the finger 88 allows pin 60 to rise, but not back to its Fig. 2 position as it contacts the underneath of the pawl 56 and remains there until the film is advanced. The spring 92 is also returned as arm 74 rises, the hook 93 tripping the cocking latch (110) upwardly so as to free a cocking lever (106), which is in fact the other end of the torsion spring 64 to the striker 66, thereby allowing the whole torsion spring assembly to rotate clockwise to clear a path for the striker latch 44. The cocking latch (110) is freed by the hook 93 and returns to hold the cocking lever (106) in position. Film wind. A film wind handle 14 and a lever 12 are rotated counter-clockwise Fig. 1 and the film is advanced by rack 20, pinion 22 and take up reel 24. Rotation of the lever 12 rotates the striking plate 28 clockwise to the cocked position by means of tabs 34, 38, thereby permitting the striker latch 44 to return to the Fig. 2 position. Rotation of the lever 12 also moves a link 46 to the left which in turn causes counter-clockwise rotation of a cocking plate 50. The pawl 56, mounted on the plate 50, rotates the flash-cube 1 through its engagement with the ratchet 54. The counter-clockwise rotation of the pawl 56 clears it out of the upward path of the pin 60 which thus rises and prevents the pawl 56 from further engagement with the ratchet 54 on the return stroke of the cocking plate 50. As the plate 50 nears the end of its counterclockwise rotation, it displaces a cocking pin 68 and thus loads the torsion spring 64 which is held under load when the cocking plate 50 makes its return stroke by action of the latch (110).