Patent GB-1355084-A (GB)
Title: Film cassette and an adapter for mounting it on a camera
IPC: G03B17/30
Filed: 1971-06-11
Abstract: 1355084 Cameras and cassettes NIPPON KOGAKU KK 11 June 1971 [12 June 1970] 27513/71 Headings G2A and G2X An assembly comprises a camera, and an adapter for mounting a cassette thereon, the cassette having a draw cover for closing the exposure aperture in the cassette, the arrangement of the assembly being such that (a) the cassette cannot be mounted to the adapter with the draw cover open, (b) the cassette cannot be removed from the adapter, or the adapter from the camera, when the draw cover is withdrawn from the cassette, (c) the adapter can be mounted on the camera and dismounted without the cassette being present therein, (d) the shutter button cannot be operated when the draw cover is in the closing position. Fig. 1 shows the adapter 15 in a position spaced apart from the camera body 2, to which it can be attached Fig. 2 (not shown) by a latching member 3. Member 3 is pushed to the left, against spring 7, to unlatch the hook portion 3b from pins 14 on adapter 15 so that it can be detached from the camera body. The cassette, shown in Fig. 3, can be inserted into the space 30 in the adapter. The cassette contains the photo-sensitive medium 38, an opening 50 through which it is exposed, and a draw cover 37 which, in the position shown, covers the opening 50 but which can be withdrawn through a side opening 36. Pivoted in the cassette by a pin 41 is a signal member 42, biased clockwise by a spring 44. Member 42 has three projections 42a, 42c, 42d which can project through openings 40, 46, 39 in the cassette wall. A lever 17 is pivoted to the adapter at one end by a pin 16, and at the other end is pivoted by a pin to a two-armed lever 19. One end 19a of one arm projects through an opening 34 and one end 19b of the other arm projects through another opening 25. Inititally, the adapter is coupled to the camera body, i.e. from the Fig. 1 position to the Fig. 2 (not shown) position, and can be uncoupled, if required, merely by pushing 3a to release the latch members. The draw cover 37, when in position within the cassette, as in Fig. 3, bears against signal member 42 and pivots it anti-clockwise, so that projection 42d is retracted inside the cassette. The cassette can now be inserted completely into the adapter, as shown in Fig. 6. If the draw cover has been removed spring 44 pivots member 42 so that the projection 42d extends through opening 39, and prevents the cassette from being completely inserted into the adapter Fig. 4, (not shown). When the cassette is only partially inserted, it pivots lever 19 clockwise. End 19a of lever 19 is brought opposite the end 12a of a lever 12 on latching member 3, and the abutting of these two levers prevents the adapter from being coupled to the camera. When the cassette has been completely inserted into the adapter, projection 42a extends through an opening 24 in the adapter wall and engages against lever 17, pivoting it, and hence lever 19, clockwise. End 19b of lever 19, urged by a spring 20, enters into a recess 35a in the top wall of the cassette. At the same time end 19a of lever 19 has moved out of alignment with end 12a of lever 12, so that the adapter can be coupled to the camera (Fig. 6). In this position the third projection 42c of member 42 extends through the opening 46 and pushes anti-clockwise a lever 26 pivoted on the adapter. The end 26a of this lever engages a cut-away portion of the shutter release button 13, so that this cannot be pressed. If the draw cover 37 is now withdrawn, member 42 is allowed to be pivoted clockwise by spring 44. Projection 42a is retracted from lever 17, so that end 19a of lever 19 is once more brought into alignment with end 12a of lever 12, so that the adapter cannot be uncoupled from the camera body. At the same time projection 42d extends through opening 39 to latch into a notch 31 in the adapter, so that the cassette cannot be withdrawn from the adapter. Also at the same time projection 42c is retracted out of engagement with lever 26, so that this can be pivoted clockwise by spring 32. Its end 26a is withdrawn from engagement with the shutter release button 13, so that this can now be operated.