Patent GB-1101892-A (GB)
Title: X-ray examination apparatus
IPC: A61B6/00
Filed: 1965-03-19
Abstract: 1,101,892. Diagnostic X-ray apparatus. SIEMENS-REINIGER-WERKE A.G. 19 March, 1965 [20 March, 1964; 4 April, 1964], No. 11901/65. Heading H5R. Diagnostic X-ray apparatus is adapted for use with the tube 8 (Fig. 2) situated close to the patient table or at a relatively large distance from it, by mounting the tube on an arm 22 supported by a bar member 21 which forms part of the telescopically-extending main spar 13 of the carriage 10 for the X-ray tube and image layer devices, a collapsible bracing means 26. 27 extending between the tube supporting arm and the carriage 10 to increase the stability of the arrangement for " distant " exposures. The patient table (2, Fig. 1, not shown) is rotatable about a horizontal axis (4) in a vertical frame (1) and support structure (3) having radiation screens (7). The carriage (10) moves vertically on frame (1). A supporting structure (11), for the tube and image layer devices, including the main support spar (13), moves transversely of the table in this carriage. The image layer comprises a frame (15) in which a cassette and one of two anti-scatter grids, adapted for use with " close up " and " distant " exposures respectively, can be moved from a " ready " into an exposure position in front of the fluorescent screen (16). Control of the motors for the movement of the extensible tube support and of the screens, is by block-shaped buttons (19, 20) mounted on the image layer frame. X-ray tube support.-The tube 8 is mounted with a diaphragm box 31 at the end of arm 22 carried by the rod 21 which is of square section and is moved by a motor driven gear, inside the support 12, engaging a rack 23 provided on the side of the rod. The bracing means comprises pivoted arms 26, 27 which are of U-shape section and nest together inside the arm 22 when the tube is moved to the closeup position and extend fully in the distant one (as indicated in Figs. 3, 4, not shown). Control of screen movement.-The buttons (19, 20) operate mechanically and are linked to ensure that the correct screen is in the radiation path depending on whether the tube is in the " close-up " or " distant " position. The screens (33, 34, Fig. 5, not shown) are moved inside the image layer frame (15) by means of endless belts (35, 36) which run over toothed pulleys (37, 38) driven by a motor through a shaft (43, Fig. 6, not shown). When button (19) is pushed the arm (21) is caused to extend from the spar (13) to carry the tube to the " distant " position. When the button (19) has been depressed the pulley (38) controlling movement of the screen (34) for the " close-up " arrangement, is locked, while the shaft (43) is locked to the pulley (37) so that when the button (20) is depressed to start the motor driving shaft (43), the correct screen for the " distant " arrangement is moved into the radiation path. Similarly, when the button (19) is pulled out to bring the tube to the " close up " position only the corresponding screen for the " close-up " arrangement is movable. A latching system is provided to prevent operation of button (19) while a screen is moved out into the radiation path by the depression of the button (20).