US445008A

US445008A - Insulator

Info

Publication number: US445008A
Authority: US
Publication date: 1891-01-20
Anticipated expiration: 1908-01-20

Description

W. VOGLER.

INSULATOR.

(No Model.)

No. 445,008. Patented Jam-20, 1891.

'mz mms revus en., mimo., immun, n. c.

UNITED STATES PATENT OFFICE.

WILLIAM VOGLER, OF SOMERVILLE, MASSACHUSETTS.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 445,008, dated January 20, 1891.

Application filed May 2S, 1890. Serial No, 352,841. (No model.)

To all whom it may concern.-

Be it known that I, VILLIAM VOGLER, of Somerville, county ot Middlesex, State of Massachusetts, have invented an Improvement in Insulators, of which the following description, in connection with the accompanying drawing7 is a speciication, like letters on the drawing representing like parts.

This invention relates to insulators especially adapted to be used in the overhead system ol:` electric railways as a support for the usual trolley-wire.

In practice it has been demonstrated that many compositions Which are excellent insulators in themselves are uniitted for use as an insulator for the overhead trolley-Wire, owing to the liability of the said insulating` material being melted by sparks or flashes of the current between the trolley-Wheel and the trolley-Wire.

My invention has 'for its object to provide an insulator capable of resisting the action of the electric flash or spark, whereby the compositions heretofore untitted for service on electric railways may be used.

In accordance with my invention the insulator is composed of a central portion ot' insulating material ot high insulative capacity and an outside or protective covering of insulating material oi a lower insulative capacity, but of a higher refractory nature. The central body portion of the insulator in practice will preferably be molded around a sleeve threaded on its inner side to engage the threaded shank ot' a bolt or hanger to which the trolley-Wire is secured, and the outside or protective coveringis molded upon the central insulating-body- Hy invention therefore consists in the herein-described insulator, it consisting ci an inner body of high insulating capacity and an outer body ot high refractory nature protecting the inner body; substantially as will be described. f

The drawing is a longitudinal vertical section of one `form of insulator embodying my invention, the said insulator having secured 'to it the usual trolleynireB My improved insulator consists ot' an inner or central body d, herein shown as cone-i5@ shaped, it being composed of material of a high insulating capacity. rIhe inner body a has molded about it an outer body a of a lower insulating capacity than the body a, but

of a more refractory nature, the said outer 55 body a completelyenveloping the high-insulating body a, so that the latter is completely protected from sparks or flashes, which in practice might arise by the breaking ofthe contact between the usual trolley-Wheel (not 6o side of the insulator into a threaded sleeve 65 cr nut 122,) about which the insulating-body a is first molded.

The insulator in practice is suspended, as herein shown, by means ol' a Wire c and branch Wires cj secured to the said Wire and 7o to a Wire ci, herein shown as located in a groove formed in the surface of the outer body a near the base of the insulator; but I do not desire to limit myself to the particular manner shown for suspending the insu- 7 5 later7 as it may be suspended in any usualor Well-knoivn manner.

I have herein shown my improved insulater as cone-shaped5 but I do not desire to limit myself in this respect, as the saidinsrn 8o lator may be of any desired form.

It will be noticed that the insulating inner body a, which is ol high insulative capacity, is completely protected by the outer body a',

which is oi' a lower insulative capacity,but ot' S5 a higher refractory nature, so that it is un affected by the sparks or ilashcs.

The inner body c may be made ol any ot the high insulating compositions new known to electricians, and the outer body may be 9o made of pulverized broken glass or asbestus cemented together by a Water-proofing material.

1. The herein-described insulator', it con- 95 sisting of an inner body of high insulating capacity and an outerbodyof high refractory .In testimony whereof I have signed my` nature protecting the inner` body, substzm name to this specication in the presence 'of xo tially as described. two subscribing Witnesses.

2. The herein-described insulator, it con- 5 sisting of an inner body ot' high insulating WILLIAM VOGLER.

capacity and an outer body of high refractory Witnesses: nature enveloping the inner body, substan- JAS. H.' CHURCHILL, tially as described. EMMA J. BENNETT.