MR. DONALD RAY HUDSON, P.T.
Physical Therapy at Merton Minter, San Antonio, TX

4034225, Jul 5, 1977

Apr 24, 1975

5/571265

Donald C. Hudson - San Antonio TX
Charles R. Morris - San Antonio TX
Horst G. Fleck - San Antonio TX
Karl A. Senghaas - San Antonio TX

Pennwalt Corporation, S.S. White Dental Products Division - Philadelphia PA

G11B 100

250471

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.

4017737, Apr 12, 1977

Apr 24, 1975

5/571266

Donald C. Hudson - San Antonio TX
Charles R. Morris - San Antonio TX
Horst G. Fleck - San Antonio TX
Karl A. Senghaas - San Antonio TX

G21K 508

250453

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.