Patent GB-191224046-A (GB)
Title: Improvements in or relating to X-Ray Apparatus.
Inventor: SNOOK HOMER CLYDE
IPC: H05G1/00
Filed: 1912-10-21
Granted: 1913-08-21
Abstract: 24,046. Snook, H. C., and Kelly, E. W. Oct. 27, 1911, [Convention date]. R÷ntgen-ray apparatus.-In a portable X-ray apparatus for army or other use, a motor drives an electric generator, and one lever controls both the motor and the generator-circuit. The patient is supported on a stretcher laid on a table carrying the movable frame holding the X-ray tube. Means are provided for testing and reducing the vacuum of the tube, and for holding a photographic plate on the patient. The motor M, Fig. 1, consists of a twocylinder explosion - engine and drives the self-exciting generator G through a friction clutch, the driving-member of which consists of rings 14, Fig. 4, preferably of phosphor-bronze, pinned to a flange 15 on lugs 13 driven through springs 11 by arms 9 on the driving-shaft 8. The jaws 16 on the generator - shaft 18 are drawn together by spring bolts 17. The generator G delivers alternating current, through the reversing-switch S, to the transformer T, and thence to the rectifying-switch R which may be as described in Specification 13,854/08 delivering unidirectional impulses from the terminals 36, 35 and driven through the insulating-coupling 34 from the generator shaft 18. The terminal 36 is connected through an ammeter 56 on a stand 49 to the anode of the X-ray tube. On the terminal 35 is mounted an arm 44 resting on a bar 47 connected to the kathode of the tube. The arm 44 can be swung upwards on a pivot 45 to contact with a bar 53 connected to the vacuumregulator terminal of the tube. These connexions to the tube are made with spring reels to take up slack. The tube is mounted on a carriage 71, Fig. 3, movable longitudinally on rollers 70 on the table or support 63 for the stretcher 66. The tube is held in clamps 75, which are pivoted at 74 on the carriage to permit of its removal, and has a lead-glass shield 78. The stretcher 66, besides being movable longitudinally, is movable transversely between projections 65. A photographic-plate holder 100 is held against the patient by a weighted strap 110. Rubber shock-absorbing feet r are provided on the various frames; the stand 49 may be staked to the ground. To control the motor M and the generator circuit simultaneously, a lever 7, Figs. 1 and 7, having an arm 88 connected to the throttle valve 91 is used. Another arm 98, loosely pivoted and connected by a spring 99 to the arm 88, controls the sparktiming device 94. The lever 7 carries an insulated contact 21 completing the generator circuit on engaging the contact 22. To test the tube vacuum, a rod 39, 38, having an insulating- handle 40, is moved forward through a hole 43 in the arm 44 towards the terminal 36 till a spark leaps. To regulate the tube vacuum, the rod 39, the bent end 38 of which lies in a jaw 37 on the arm 44, is rotated on its axis, raising the arm 44, which breaks contact with the bar 47 and makes contact with the bar 53. The Specification as open to inspection under Section 91 (3) (a) states also that the lever 7 may be rotated through a short distance counterclockwise, to short-circuit the ignition magneto and at the same time open the intake and exhaust valves of the motor. This subject-matter does not appear in the Specification as accepted.