Patent GB-525561-A (GB)
Title: Improvements in or relating to photographic cameras
IPC: G03B17/42
Filed: 1939-02-06
Abstract: 525,561. Photographic roll-film cameras. ZEISS IKON AKT.-GES. Feb. 6, 1939, No. 3911. Convention date, Feb. 5, 1938. [Class 98 (i)] In a collapsable roll-film camera, the front of which is supported by a folding base board or a lazy-tongs and carries the shutter, the shutter release is provided on the camera body, and the film feeding and shutter setting means are connected for common actuation by a linkage which is formed of rigid transmission members and is capable of folding or contracting when the camera is closed. An interlocking device may be provided between the shutter release and film-feeding means, to ensure that they are operated alternately. A number of constructions are described. In that shown in Fig. 1 and 3, Fig. 1 being an underneath view, an arm 13 carries at its front end a hinged flap 14 which when the camera is open is in position to engage either the shutter setting knob 22 or the release knob 23, but which when the camera is closed is moved by a link connection 15 to the body so that it lies against the baseboard, as shown in Fig. 3. The arm 13 is hinged to a sleeve 8 carried by a screwed part of a shaft 4, which forms the hinge pivot of the baseboard. On winding the film, a gear 3 engaging a gear 12 on the shaft 4 rotates the shaft, causing the sleeve 8 to carry the arm 13 laterally so that the flap 14 operates the shutter-setting knob 22. A mutilated portion of the gear 3 then releases the gear 12, and a spring 11 rotates the shaft 4 reversely and restores the sleeve 8 and arm 13 to their normal positions. Pressure on the release knob 7 moves the shaft 4 longitudinally, carrying with it the sleeve 8 and arm 13 to cause the flap 14 to operate the shutter release 23. An interlocking device of known construction permits the film-winding and shutter release knobs to be operated only alternately to one another. In a modification, the shutter release rod and the film spool axis are at right angles to the shaft 4, the rotational and longitudinal movements of the release rod being transmitted through bevel gear and a bell-crank lever respectively. In other modifications, the arm 14 is replaced by a lever, which is either pivoted to the body at the rear of the shaft 4 and hinged in front of it to allow of folding, or is pivoted to the baseboard, the lever being in each form oscillated by a sleeve similar to the sleeve 8. In the form shown in Figs. 12 and 13 a cam 44 on the film-winding shaft is engaged by an arm 46 on the shutter release rod 45. On winding the film, the cam raises the rod 45, which through a bell-crank lever 53 shifts a sleeve 55 which is mounted on the baseboard hinge rod 54 and carries a lazy-tong linkage 57 taking the place of the arm 13. The lateral movement of the lazy-tongs causes a plate 58 attached to the front end to give a partial rotation to a ring 42 so that it engages and operates the setting knob 22. The cam then allows the parts to return to their normal position. Depression of the release knob 7 causes a reverse movement of all the parts, the ring 42 then operating the shutter release 23. A modification of this form is similar to that shown in Fig. 1, the lazy-tongs being carried by the sleeve 8. In a further modification, the lazy-tongs are replaced by a lever pivoted to the baseboard and operated by the sleeve 55. Several forms are described in which separate members are used to actuate the setting and release knobs of the shutter. In that shown in Fig. 25 a shutter-setting lever 101 is hinged near the baseboard hinge and pivoted at its rear end in the camera body. It is operated by a link 100 connecting it to a sleeve 98 which is moved on winding the film by an arm 99 engaging a cam 90 on the winding shaft. The shutter release rod 102 extends through the sleeve 98 and engages the bent end of a shutter release operating rod 104 which is rotatably carried on the baseboard.