US1643462A - Terminal plug and sheath for electric cables - Google Patents

Description

Sept. 27, 1927. 1,643,462

I H. KOCOUREK TERMINAL PLUG AND SHE ATH FOR ELECTRIC CABLES ,Filed Oct. 1926 Z V'eJpZ OJ Z w :ifez z z i flocozzfeh. ig 3, 3 @WM trating the effect of "end UNITED s rarimfr'Otfiucal;

Hanna I KOCOU B' EK', OF CHICAGO, ILLINOIS, COMPANY, OF CHICAGO, ILLINOIS,

A, COBPQBA'ITION OIILLINOIS.

rnnmmAL-rnoo. Ann s nnarnlron. ammo enemas.

' Application filed. October a, 1926. sc -"m1 111p 143,486.

The purpose of this invention is to prgvide a sheath which shall be adapted'for s cure attachment to electric cable enlargement of the latter, while at the same time ailording ample clearance within this sheath around the cable to avoid chafing the insulating covering in the flexure of the cable and sheath, and in such flexure to permit the cable to bend in'a curve of greater radius than that of the bend of the sheath.

The invention consists in the elements and features of construction shown and described as indicated in the. claim.

In the drawings: a

Figure 1 is a sect-'on, axial with respect to the electric cable, of a terminal plug for such cable equipped with a sheath in a manner exemplifying this. invention. 1

Figure 2 is a axial section the plug body, coupling bushing, adjacent terminal of securing nut.

Figure 3 is a 33, of Figure 1, showing the parts upon a magnified scale.

Figure 4 isa diagrammatic view for illus the construction for avoiding abruptbending of the conducting wires in. flexing the cable at the part protected by the sheath.

' Figure 5 isa. section at line 5-5 on Figure 3. y 1

' In the structure shown in the drawings, A is an insulating body of the terminal plu of an electric coupling cable of conventions. form, commonly employed'ior coupling to anelectric iron or other electrical heatipg device. B is the electric cable-having i eading andoutleading wires, "10 and 11,

tact sockets, 12 and 13, carried by-the plug, C is. a bushing having intermediate its ends an encompassing boss, 15, and adapted at the end ortion, ;16, to plug ha y, A, as by being screwed at said ortion' into the the ody, being sto .ped' longitudinally by the shoulder, 15, o the annular flange or boss, 15, the bushing having the end ortion threaded as seen at 18. D is the sheath made of coiled spring wire having a limited number of coils, as seen at 20, of diameter. to admit the cable and fit it rather closely so as -not to defeat easy 1on the terminal plug of an' connection without requiring 21, this tapered portion belng dissected view presenting in the sheath, and thedetail semen on the'line,

ceive; for it will be engaged with the hub or end boss,'a, of

sheath wire-to efie'ct connection.

opposite largement of the coil gitudinal: movement, the tlnued from these close coils at the outer .end portion any desired lengthof the cable,

but as thefplug-connected'end of the sheath 1s approached the coils-are gradually increased in diameter, rendering the sheath exteriorly and interiorly tapered, as seen ,at. followed by a portion, 22, in which the coils are close and of successively increasing diameter, continuing to taper until the interior diam eter becomes such that the close coils constitute an inter or thread adapted to engage the exterior thread '18 of the bushing, and when this diameter is reached the remain-' ing coils, 23, eter; and it will be understood that this sheath. being con- I nssienon-r'o cirrc'aoo rnnxnsna snn'r to the end are of uniform diam thread, 18, of the bushing is formed, as to pitch and depth, ate screwwise with the close coiled terminal part, 23, of the etered for being passed onto the sheath from the smaller end, adapted to engage the close coiled portion, 23, of the, sheath atthe larger end, and threaded for screwing'onto sai close coiled part up to the shoulder, 15", of the bushing, 15. By this means the sheath so'as to be fitted to co'-oper-,

sheath. E is a nut diamdad is rendered inseparable from .the plug by which the sheath ma 'rebe observed that the direction in which the sheath would have to be rotated to unscrew it from between the bushingand the nut .is the direction for tightening the coil,

any screw action that terof the coil, and such tightening makes the gri of the the bus ing tighter and applied sheath between the bushing and the .nut. This expedient for securing the sheath to the.

ofthe hub, a, of theplug body to afi'ocd engagement of the. is common construction for securing the sheath to the plug body, and avoids weak-v ening the 'hub or en 0 lug body may be provided for like puiipose y aperturing it for'th'e engagement- '0 the by the service of the implement to which it is for reducing the'diame T coil uponthe thread oftighter as force is v,ifor attempting to thus rotate the secured in the usual manner to separate conplug avoids anv necessit for enlargement sheath within'th e latter, as

ss with which the At the v 105. diameter at the end plug is attached for ushingv permits the adapted at one end rior y 'is connected, to normally assume a curve of greater radius than that of the inner side of the bend-.ofthe sheath, as seen in Figure 4; and bythis means abrupt bending of the cable at its emergence from the plug body is revented.

claim In a device for the purpose stated, in combination with the render the sheath taperingly enlarged. to-

bod

ward one end and having the extreme end portion following said taperingly enlarged part coiled close and of uniform diameter, the exterior thread of the bushing being conformed to said close-coiled uniform di ametered end portion of the sheath for receiving the latter as a female thread, and a nut diametered for passing over the coiled sheath from the smaller end of the tapered part and threaded for sore-W engagement with and outside of the uniform diametered close-coiled end portion of the sheath inside whic the bushing is screwed.

'In testimony whereof, I have hereunto set my hand at Chicago Illinois, this 20th day of October, 1926.

HENRY KOCOUREK.

Images