Patent GB-253522-A (GB)
Title: Improvements in or relating to magazine change boxes for photographic cameras
IPC: G03B17/34
Filed: 1926-06-07
Abstract: 253,522. I. G. Farbenindustrie Akt.- Ges., (Assignees of Becker, 0.). June 9, 1925, [Convention date]. Change-boxes, self-contained. - A change-box for plates, of the kind constituting a renewable drawer which slides in a permanent adapter and is fitted with a cover-slide, is characterized in that the drawer is constructed of an inner and an outer casing and an interposed cover-slide, all preferably of sheet metal, forming a lighttight package for the plates, and having lightprotected openings in its outer walls for the admission of liquids in order that the plates may be developed and fixed in the drawer after exposure. In the form shown, an adapter 1, Fig. 1, which forms a fixed or removable part of the camera, encloses a light-tight drawer comprising an inner casing 6 enclosing the pile of plates 2, each of which has separating strips 3 along its longitudinal edges, an outer casing 8, and an intermediate casing 7 which acts as a cover-slide. The inner casing 6 comprises a base 9, Fig. 4, two side walls 10, and a front end-wall 11. It is open at the top and the rear end 12, and its base carries springs 13 which press the plates upwards. Velvet 15 ensures a light-tight closure between the casing 6 and the cover slide 7, which comprises a top 20, Fig. 7, and two side walls 21, Fig. 1, having flanges 22 at their lower edges to embrace the sides of the casing 6. It is open at its rear end 23, and carries a handle 25 at its front end. On the sides of the inner casing are bosses 19 which guide the coverslide, and along the edges of the top 20 of the cover slide are bosses 20<1> which space the adjacent plate from the slide during development. The outer casing 8 comprises side-walls 27, Fig. 10, having bosses 28 which guide the cover-slide, and side flanges at top and bottom. The bottom flanges are bent as shown in Fig. 1 to provide guides 29 for the flanges 22 of the slide 7, and guides 30 for the base of the inner casing 6. The casing 8 is open at its front end 31, where the side walls are braced by cross-members 32, and is closed at its rear end by a wall 33 which carries light-obstructing strips 34, 35, 35<11>, and plate guides 35<1>, and is perforated by lighttight openings 37 through which the developing &c. liquids are introduced. The adapter 1 comprises a base 39, Fig. 13, side walls, and a top 42 having an exposure window 43. It is closed at its rear end by a wall 40, and has, an opening at its front end 41 which is protected by light. tight packing 44, 45. Leaf springs 50, 51 are secured respectively to the base and top of the casing. The inner and outer casings 6, 8 are locked together by a catch 18, Fig. 4, on the inner casing, operable by an external handle 17. When the change box is inserted in the adapter, it is held by catches 46 on a leaf spring 47 operated by a projecting handle and the springs 50 press the box against the exposure window 43. To expose a plate the cover slide 7 is withdrawn by means of the handle 25, complete withdrawal being prevented by stops 38 on the casing 8. The pile of plates is pressed towards the exposure opening by the springs 13, and on pushing in the slide 7 this lies between the uppermost plate and the remainder of the pile. To change the plates, the catch 18 is released, and the inner casing and cover slide are pulled out together by means of the handle 17. The exposed plate remains behind, and is pressed downwards by the springs 51 so that when the inner casing is pushed in again, the plate bears against the lowest part of the pile of plates. The drawer is withdrawn for development by releasing the catches 46, the removal being assisted by a leaf spring 40, Fig. 13. It is immersed in the developing &c. liquids after removing any light-obstructing material from the holes 37.