Card – picture – or sign exhibiting – Photographic transparency viewer – e.g. – x-ray viewer
Patent
1983-01-12
1985-07-09
Mancene, Gene
Card, picture, or sign exhibiting
Photographic transparency viewer, e.g., x-ray viewer
40617, 40 11R, G09F 1300
Patent
active
045273472
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to fixing means for mounting X-ray films, or like elements to an illuminated surface, of an X-ray examining cabinet in a readily detachable manner.
BACKGROUND ART
The Swedish Patent Specification Number 310 603 discloses a fixing means of the kind mentioned which comprises a resilient member made of rubber, plastics or the like and having an anchoring portion arranged to be received in a profiled frame element associated with the cabinet or with a separate film magazine, and a film-engaging portion which is arranged to be deflected, or pushed to one side, when an X-ray film is introduced between said surface and said film-engaging portion, and then released, so as to hold the film against the illuminated surface by friction.
One disadvantage with this known X-ray film fixing means is that the film-engaging portion must be capable of exerting a relatively high pressure against the illuminated surface, in order to hold the film satisfactorily. This means, however, that a correspondingly large force must be exerted in order to deflect the film-engaging portion when mounting the X-ray film in position. Consequently, in practice, the films are often not fixed to the illuminated surface satisfactorily, and as a result fall off and are liable to be damaged and hence render it difficult or impossible to make a diagnosis on the basis of the X-ray film in question.
Furthermore, X-ray films of the kind in question are often carried in vertically moveable film-supporting frames in a wheeled transport box which, similar to a carriage, can be moved between a storage station and one or more different X-ray examining cabinets, where the films are examined. During transportation of such a box or carriage, the box or carriage is subjected to vibrations and similar movements, and there is an undeniably high risk of a number of films loosening from their respective fixing means, which can cause chaos in the whole of the system arranged to enable accurate identification of the various X-ray images. If this situation arises, it is often necessary to re-take the X-ray films, with a subsequent increased dosage risk for the patients.
OBJECT OF THE INVENTION
It will readily be understood herefrom, with respect to the handling of X-ray pictures, that it is of the utmost importance, and highly desirable, that the films can be readily mounted on the illuminated surface, securely held in position thereon-possibly over long periods of time-and can readily be removed from said surface when so desired.
Hitherto known fixing means, for example fixing means according to the aforementioned Swedish Patent Specification, do not satisfy these requirements, and consequently an important object of the present invention is to provide a fixing means which eliminates the disadvantages inherent with previously known fixing means and which also fulfills the aforementioned requirements.
A further problem relating to the profiled frame element, which may comprise aluminium for example and which carries the resilient members of the fixing means, has a different coefficient of expansion than the illuminated surface, which may be made of plexiglass for example. This means that the distance between the film-engaging portion of the resilient member and the illuminated surface can vary independence upon the temperature in the room where the arrangement is located and/or how long the surface has been illuminated. It will be understood from this that further problems are experienced with respect to the reliability of the fixing means, since the force at which the film is pressed against the illuminated surface will vary correspondingly.
Consequently, a further object of the invention is to also eliminate this disadvantage encountered with known fixing means.
BRIEF DISCLOSURE OF THE INVENTION
A fixing means according to the invention which fulfills these objects is mainly characterized in that the engaging portion is supported so that it forms a right angle or an actute angle with the anchoring portion; tha
REFERENCES:
patent: 2049820 (1936-08-01), Myhre
patent: 2530821 (1950-11-01), Hubbell
patent: 2755585 (1956-07-01), Lubow
patent: 2972201 (1961-02-01), Niedermayer
patent: 3552702 (1971-01-01), Springer
AO Medical Products AB
Contreras Wenceslao J.
Mancene Gene
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