GB665284A - Carbon pile regulator - Google Patents

Abstract

665,284. Compression resistances. BENDIX AVIATION CORPORATION. Jan. 6, 1949 [April 1, 1948], No. 419/49. Class 37. [Also in Group XXXV] In a carbon pile regulator in which hollow carbon discs are positioned within an insulating cylinder between two contact-members, one contact member is attached to one end of a tube, projecting longitudinally into the hollow discs, the other end of which is attached to a rod, extending through the tube, the other end of which is fixed. The rod has a lower coefficient of expansion that the tube, thus providing temperature compensation for expansion and contraction of the carbon discs. In Figs. 1 and 2 a pile of hollow carbon discs 10 housed in a ceramic tube 11 engages at one end a contact 14 centralized by a leaf-spring 85 biasing the contact away from the pile. A button 16 carried by contact 14 engages an element 17 on an armature 18 which is hinged at 38 and biased toward the pile by curved metal spring blades 75 acting through a member 68, an adjustable member 64, and a ball-joint 56. The compression of the pile is controlled by an electromagnet 46 having an adjustable core 50. Core 50 and member 64 are so adjusted that the forcedeflection characteristics of electromagnet and springs are matched. At its other, end the pile engages a contact 15 which carries a tube 20, of a material having a high coefficient of expansion, e.g. copper, projecting into the pile. Tube 20 is coupled at its innermost end to a rod 24, of a material having a low coefficient of expansion, e.g. invar, secured at its other end to an adjustable insulated support 28. Relative expansion between tube 20 and rod 24 is arranged to compensate for changes in pile length with changes in pile temperature. A rheostat 94 mounted on a bracket 90 is connected in series with electromagnet 46 and permits setting of the regulated value from outside casing 102, while sockets 93 are provided for the external connection of a voltmeter to measure the regulated value. In a modification, Fig. 3 (not shown), member 68 is split and a screw 80 acting as a wedge provides Further adjustment of the force-deflection characteristic of springs 75. Specification 638,562, [Group XXXV], is referred to.