X-ray or gamma ray systems or devices – Photographic detector support – Sheet film cassette
Patent
1990-10-12
1992-03-31
Howell, Janice A.
X-ray or gamma ray systems or devices
Photographic detector support
Sheet film cassette
378187, 378188, G03B 4204
Patent
active
051014238
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an X-ray cassette for retaining a sheet film for X-ray usage or the like.
BACKGROUND ART
X-ray cassettes are disclosed in, for example, Published Examined Japanese Utility Model Application No. 55-50672 and Published Examined Japanese Patent Application No. 58-33540 (German Utility Model Application No. 812806). The former X-ray cassette has a metal frame provided around a front plate. The latter X-ray cassette has its front plate and frame made integrally of plastic, and has flexible members attached to the corner portions of the frame to absorb shocks caused by falling or the like, thereby preventing the X-ray cassette from being damaged.
The frame of the former X-ray cassette is formed by cutting an elongated metal member, such as an aluminum extruded member or roll-molded member, to the proper length, bending the cut member to match the shape of the front plate, and joining its but-joint ends together by means of welding or the like. Although the X-ray cassette is excellent in term of the durability, shock resistance, etc. due the frame being made of metal makes the manufacturing thereof troublesome. In other words, the cross-sectional shape of the frame should be determined in consideration of the bending formation, which limits the improvement thereof in terms of strength. Further, deformation or twisting may occur at the time of bending the metal member. Furthermore, there may be a slight error in the bent positions of the frame; particularly, insufficient strength, the occurrence of deformation, twisting or the like, and an error in the bent positions should be considered for a large cassette for retaining a broader film.
Since the latter X-ray cassette is made of plastic, it is easy to produce and is excellent in terms of obtaining accuracy in sizes. Because of the plastic-formed, however, the X-ray cassette has low durability and low shock resistance, making it easy to cause deformation with the passage of time.
It is therefore an object of the present invention to provide an X-ray cassette which has an improved strength, is free of deformation, twisting or the like, is easy to manufacture, and can improve the size accuracy.
Disclosure of the Invention
In order to achieve the above object, the X-ray cassette of the present invention, which has a substantially rectangular front plate, a frame providing around the front plate and a back plate hinged to the frame. The frame comprises corner members corresponding to corner
of the front plate and straight members, connected to the corner members and corresponding to side portions of the front plate. Each of the corner members has a substantially L-shaped body, fitting projections protruding from both ends of the body and fitting pins formed integrally. Each of the straight members has fitting recesses to receive the fitting projections and fitting pins of the corner member with front-plate receiving grooves formed continuous in inner walls of the corner members and the straight members for receiving edge portions of the front plate.
In forming the frame by the above combination of structural the corner members and the straight members can eliminate a step of bending the frame, and can permit the use of members with a cross-sectional shape having an excellent strength to deform or twist without consideration of bending formation. In addition, it is possible to reduce the occurrence of deformation or the like with the passage of time.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1 through 7 illustrate one embodiment of an X-ray cassette of the present invention;
FIG. 1 is an exploded perspective view of a frame;
FIG. 2 is a general perspective view of the X-ray cassette with its back plate open;
FIG. 3 is a general perspective view of the X-ray cassette with its back plate closed;
FIG. 4 is a cross section taken along the line 4--4 in FIG. 3;
FIG. 5 is a front view of essential portions;
FIG. 6 is a cross section taken along the line 6--6 in FIG. 5;
FIG. 7 is a cross section taken along the line 7--7
REFERENCES:
patent: 3157787 (1964-11-01), Kendziorski, Jr. et al.
Ohta Masayuki
Okamoto Tadaomi
Howell Janice A.
Kabushiki Kaisha Okamoto Seisakusho
Porta David P.
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