Patent Number: 048797367
Section: claims

1. An x-ray examination installation for examining a patient comprising: means for generating an x-ray beam in which said patient is disposed, and having a central ray;  an x-ray image intensifier having an image axis substantially coincident with said central ray;  an x-ray film changer;  means for mounting said x-ray film changer so that said x-ray film changer can be optionally moved through about 90.degree. between an exposure position in front of said x-ray image intensifier and a standby position out of said x-ray beam; and  bearing means at least partially surrounding said x-ray image intensifier in a plane substantially perpendicular to said image axis, said x-ray film changer being attached to said bearing means and displaceable along said bearing means.  a curved carrier having opposite free ends, said x-ray image intensifier being mounted at one free end of said carrier and said means for generating an x-ray beam mounted at the opposite end of said carrier, with said patient disposed therebetween.  means for generating an x-ray beam in which a patient is disposed, and having a central ray;  an x-ray image intensifier disposed to receive said x-ray beam after attenuation by said patient, said x-ray image intensifier having an image axis;  an x-ray film changer;  means for optionally moving said x-ray film changer through 90.degree. between an exposure position in said x-ray beam and a standby position out of said x-ray beam; and  a carriage connecting said x-ray film changer and said x-ray image intensifier, said carriage having a circular bearing with an inner bearing race at least partially surrounding, and attached to, said x-ray image intensifier, and an outer bearing race rigidly connected through said carriage to said x-ray film changer, said bearing disposed in a plane substantially perpendicular to said image axis and permitting displacement of said x-ray film changer in said plane along said bearing. 2. An x-ray examination installation as claimed in claim 1, wherein said bearing means is a roller bearing. 3. An x-ray examination installation as claimed in claim 1, wherein said bearing means is a smooth bearing. 4. An x-ray examination installation as claimed in claim 1, wherein said bearing means includes a carriage to which said x-ray film changer is attached. 5. An x-ray examination installation as claimed in claim 4, wherein said carriage is rigidly attached to said bearing means so that said carriage and said x-ray film changer are co-displaceable along said bearing means. 6. An x-ray examination installation as claimed in claim 1, further comprising means for locking said x-ray film changer at selected locations along said bearing means. 7. An x-ray examination installation as claimed in claim 1, further comprising: 8. An x-ray examination installation comprising: