Patent GB-458880-A (GB)
Abstract: 458,880. Rontgen - ray apparatus. ELECTRICITATS GES. SANITAS, 35, Mullerstrasse, Berlin. Nov. 2, 1935, Nos. 30366, 30367, 30369, 30370, 30371, and 30375. Convention dates, Nov. 3, 1934, Nov. 3, 1934, March 20, 1935, March 29, 1935, April 16, 1935, and Sept. 6, 1935. [Class 98 (i)] Apparatus for producing radiographs of sections or layers of bodies comprises a Rontgentube holder and a plate or film holder carried by a pivoted carrier whereby they are swung through arcs about an axis in the plane of the section or layer to be radiographed with the ray through any given point of the section or layer always falling upon the same point on the plate or film, rotation being imparted to the pivoted carrier by a spring. As shown, a slide 2, clampable on guide pillars 1, carries on a pivot 4 a beam 3 having an adjustable arm carrying the Rontgen tube 6. An arm on the beam 3 carries a rotatable bracket 8 supporting the plate-holder, and, if necessary, a screen. The arm carrying the bracket 8 is adjustable by a screw spindle 9. A screw spindle 10 works in nuts pivoted respectively to the plate-holder 8, and a bracket 11 on the slide 2. The plate-holder 8 is connected to the beam by links 12, 13. A pivoted catch 14 disengageable electromagnetically, engages a pin D projecting from the beam. On release, the beam is rotated by a spring 16 connected to a bracket 17 on the slide and to a crossbar 18, under control of an oil-pump 19, the plunger of which is pivoted to the cross-bar 18. The oil-flow is controlled by a valve 20. An exchangeable track bar 22, vertically adjustable on the pillars 1 and having a clamping screw, is balanced by a cord and weight and forms a curved track for a roller 24 carried by an adjustable bracket on the beam 3. In a modification the main spring is attached to one end of a bell-crank lever fixed to the pivot of the beam. The other end carries a roller bearing against a leaf-spring to impart initial acceleration. The effect of the leaf-spring is adjustable. In another modification the track-bar has a spiral outline. In another modification the plate-holder is pivoted to a slide on the beam. Link-work is provided to maintain it horizontal. The plate-holder is suspended by cords connected to a pulley operated by a ratchet-wheel and crank. In another modification a cord, one end of which is fixed to a bracket on the ceiling, passes over one pulley in a trolley running on a rail on the ceiling, round a pulley on the tube-carrier, and round another pulley on the trolley and a fixed pulley to a balance weight. In another modification the cord passes from a fixed eye round the pulley on the tube-carrier and a fixed pulley to a balance weight. The Specification as open to inspection under Sect. 91 comprises also the provision of adjustable contacts on the track-bar to switch the tube on and off. Relays are provided preventing the high tension current from being switched on by movement of the system until a main switch has been switched off. A sliding rod is provided on the beampivot which is pulled out to engage the patienc's body to adjust the apparatus to the required height. The slide carrying the tube supporting arm is adjustable by an endless cord and hand wheel, and the tube supporting arm carries a scale enabling the tube carrier to be moved for producing stereoscopic images. The spring drive is adjusted by a hand wheel. This subject-matter does not appear in the Specification as accepted.