Patent GB-157195-A (GB)
Title: Improvements in photographic cameras of watch form or circular casing type
IPC: G03B29/00
Filed: 1921-01-08
Abstract: 157,195. Wallace, T. July 5, 1918, [Convention date]. Cameras, watch-form; finders; shutters with sliding plates.-Relates to cameras constructed with a case of watch form, such as described in Specification 21295/04, and to the shutter therefor. The lens 10, Fig. 4, is pressed on shoulders 11 in the stem 8 by the legs 9 of a removable piece which has a diaphragm 9<c>, and is held in the stem by the engagement of ears 9<a> with burrs or detents on the stem 8. One face 7<a> of the case is integral with the annular portion and has an opening 7<b>, Fig. 1, through which the figures on the counter-wheel turned by the film-winding mechanism are seen. The film-holder comprises a framework formed of top and bottom plates 32, 33 and a front plate 34 over which the film passes. The lower edges of the plates 32, 33 are closed by a mask plate 37 held on the lower edges of the plates 32, 33 by a resilient strip 57, Figs. 3 and 4. The spools are mounted on annular depressions 32a in the plate 32. A forked winding spindle 16 extends through the face 7<a> and the plate 33 and engages a pin 35<a> of one of the spools. A stud 40, Fig. 7, projecting from the face 7a of the casing through the plate 33 engages the other spool. The winding handle 17 is pivoted on a plate 18 which is secured on the spindle 16 and prevented from slipping and inadvertent winding by a spring 19. Within the outer case of the camera is an annular strip of resilient spring metal 21 which forms an inner lining for the case. An apertured partition 43 forming part of a semicircular casing 44 is held by frictional contact within the inner wall of the outer casing, and the edges of the aperture are shaped to guide the film passing over the plate 34 of the holder. The outer casing 7<a> is formed with shoulders so as to form an annular space 20 within which the shutter 22 moves. The shutter 22, Figs. 3 and 5, has a stamped-up projection 27 extending through a slot in the case by which it is set, and it is held set by a projection 45 stamped up from a tongue 46 of the annular strip 21 which engages the edge of the exposure aperture 23. In setting the shutter an arm 30 connected to the shutter by a tongue 24 extending through a slot 25 in the annular strip 21, and which moves through a tongue 21b stamped up from the strip 21, tensions the spring coiled on the arm 30. The shutter is released by depressing a projection 47 stamped up from the strip 21, which action depresses the holding-projection 45. To hold the shutter open for time exposure another slot 51 is formed in the shutter to engage the projection 45 in the proper position. To prevent inadvertent setting of the shutter, a third slot 51a engages the projection 45 when the shutter is in its open position. To protect the tongue 46 of the strip 21 from which the projections 45, 47 are stamped, a. cover plate 52 is secured to the strip by ears 52a. The Specification as open to inspection under Sect. 91 (3) (a) also describes the construction of a finder which is attached to the stem 8 by spring arms having detents to engage recesses in the stem. The mirror 57, Fig. 11 (Cancelled) is formed in one piece with the spring arms 53 and the casing 54 containing the lens front 56 and ground glass 55 are stamped in another piece and attached to the mirror by lugs 58. The lens 56 is mounted by claw fingers 56<a>. This subjectmatter does not appear in the Specification as accepted.