Abstract: A film drive mechanism is disclosed for use with a radiographic apparatus which provides continuous radiographs or x-rays of a selected portion of a subject lying in a horizontal position by simultaneously rotating an x-ray source and an x-ray film holder including an x-ray film about the subject. An x-ray film cassette is mounted in the film holder and while the film holder rotates about the subject, the film cassette is moved past an x-ray slit. The film holder includes a novel drive mechanism for moving the cylindrical film cassette, in which an x-ray film is placed, at the proper rate of speed to provide the desired x-ray during rotation of the source and film holder. This is accomplished by utilizing a sloped cam having a configuration determined by the desired focal trough to vary the relative rotation of the shaft of a motor driving the film and the housing of the motor.

Abstract: A conveyor apparatus, such as a cart, is disclosed, for aiding in the placement of subjects to be x-rayed in position in a radiographic apparatus. The conveyor apparatus includes a conveyor belt on which a patient is placed and a mechanical linkage having a mechanical advantage connecting the conveyor belt to an operator, so that relatively small movement of the operator causes relatively large movement of the patient carrying conveyor belt.