Eugene E Thomas

US Patent:

42490790, Feb 3, 1981

Filed:

Jun 25, 1979

Appl. No.:

6/051502

Inventors:

Eugene P. Thomas - Baltimore MD

Assignee:

CGR Medical Corporation - Baltimore MD

International Classification:

G03B 4116

US Classification:

250468

Abstract:

A spot filmer for a diagnostic X-ray apparatus can be front or back loaded with two standard sizes of X-ray film cassettes. This versatility is achieved by the provision of a pair of cassette holding half trays or frames and a precision drive including stepper motors enabling the cassette frames to be driven in unison longitudinally and transversely and in opposite directions transversely to adjust for cassette sizes and to achieve firm holding of cassettes during transport and radiography. Mechanical stops are not required in the precision drive. A cassette back edge locator bar is connected by a parallel bar linkage to each cassette half tray or frame and the locator bar is advanced and retracted automatically in response to relative lateral movements of the frames by the precision drive. Compactness, strength and durability and high reliability of the mechanism are attained. The precision drive is compatible with computer controls.