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Reinforced flexible x-ray film cassette
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Inventors: Bauer, Walter;
Assignee: AGFA-Gevaert Aktiengesellschaft (Leverkusen, DE)
Primary Examiner: Pollard; Steven M.
Assistant Examiner:
Attorney, Agent or Firm: Kontler, Grimes & Battersby
A reinforced flexible x-ray film cassette includes two cassette parts which are connected at one side by a hinge and which are cylindrically curved as considered in a plane normal to the hinge. Two circumferentially extending ribs are provided on one of the cassette parts and a single circumferentially extending rib is provided on the other cassette part, the single rib being received between the two ribs in the closed position of the cassette to form a light barrier therewith and being in force-transmitting engagement therewith to reinforce the cassette against bending or twisting. The cassette part which constitutes the bottom includes a foil of ferromagnetic material floatingly supported on an elastic peripheral strip and an intensifying shield supported on this foil. The cassette part which constitutes the top includes a magnetic plate supported on elongated projections of the cassette wall and supporting another intensifying shield. In the closed position of the cassette, the magnetic plate attracts the ferromagnetic foil to thereby eliminate air inclusions between the intensifying shields and the x-ray film interposed therebetween. The hinge includes two rails interconnected by a flexible, part-cylindrical connecting portion. Each of the rails of the hinge has a recess which receives a correspondingly configurated projection of the frame of the respective cassette part. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing in detail, and first to FIG.
1 thereof, it may be seen that the reference numeral 1 has been used herein to identify a bottom part of the cassette according to the present invention.
The bottom part or cassette bottom 1 includes a cassette wall 2, and a frame 3 which circumferentially surrounds the cassette wall 2 and includes a ridge 4 which is provided at three sides or outer marginal zones of the frame 3.
A projection or ridge 4a is provided at the fourth marginal zone or edge of the frame 3, the height of the ridge 4a being smaller than that of the ridge 4.
The ridge 4a is formed, at its externally facing surface, with a T-shaped rail 5.
In addition thereto, there is formed on the cassette bottom 1, at a small distance from the ridges 4 and 4a, a circumferentially extending rib 6 which substantially surrounds a space for accommodating the x-ray film and which forms a part of a light barrier.
A closing latch 7 is provided at that side of cassette bottom 1 which is situated remotely from the side provided with the ridge 4a, the closing latch 7 being accommodated between the ridge 4 and the rib 6 and co-operating with a hook 8 provided on a top part 9 of the cassette.
The top part or cassette top 9 is substantially of a sandwich construction and includes a cassette wall 10 on which there is provided, at the side which is to be connected to a hinge 22, a ridge 12 which is also formed with a T-shaped rail 11.
Elongated diagonally extending projections 13 are provided at the inner surface of the cassette wall 10, and so are two circumferentially extending ribs 14 and 15 arranged at the periphery of the cassette wall 10.
The ribs 14 and 15 constitute further parts of the light barrier and are so constructed and arranged that they embrace the rib 6 of the cassette bottom 1.
In order to assure that the ribs 6, 14 and 15, which together form the light barrier, engage one another in the closed position of the cassette in a form-locking or a force-transmitting contact with one another and, in addition thereto, that the cassette top 1 and the cassette bottom 9 can be pivotally brought together about the side carrying the hinge 22, these ribs 6, 14, and 15 have surfaces which are inclined in the direction from the walls 2 and 10 to the end faces thereof
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