GB270411A - Improvements in or relating to inductance coils particularly for use in connection with radio apparatus - Google Patents

Abstract

270,411. Igranic Electric Co., Ltd., and Alford, W. K. Feb. 8, 1926. Inductances.-In electric inductances of the type in which an insulating body carrying plug-in terminals supporting and forming connections to the coil is secured at the circumferential periphery of the coil with the terminals projecting in the plane of the coil, the coil comprises a number of interconnected multilayer coils permanently fixed in coaxial, axiallyspaced relation and separated by dielectric the main part of which is air. Flat spiral coils 1, Fig. 2, with thick cotton insulation and with tape or paper wrappings may be spaced apart by the inwardly projecting teeth 3<a> of one or more transverse comb-like spacers 3 at intervals around. the circumferential periphery. The spacers 3 may be supported by a celluloid or other insulating. band 9 having its ends secured to a plug 4, or may be moulded integrally with a circumferential rib in the semi-circular parts, one part being moulded with a housing for the plug terminals and the other with a handle to facilitate plugging and removing the coil. The coils may be in series or series-parallel. In a modification, Fig. 5, cross-wound honeycomb coils 1<a> on a former 5 are spaced apart by teeth 6<a> on an integral moulding 6 comprising two circumferentiallyspaced, transverse, comb-like spacers. The moulding 6 also comprises a part 6b serving as a plugging handle and as an eye for hanging up the coil' when not in use. The moulding 6 and a plug 4 are bound to the coils. The Provisional Specification describes component coils in separate circuits. Reference has been directed by the Comptroller to Specifications 248,469. 255,526 and 258,381.