US1649111A - Insulator - Google Patents

Description

Nov. '15, T927. 1,649,111,

w. F. GRIMES INSULATOR Filed Feb. 8, 1922 Inventor VViZZz'am E Grimes mugg Patented Nov. 15, 1927.

WILLIAM F. GRIMES, OF WASHINGTON, DISTRICT OF COLUMBIA.

INSULATOR.

Application filed February 8, 1922.

My invention relates generally to insulators, and more particularly to the suspension or strain type for high frequency 011- cuits, such as radio antennse, and has for an object the provision of a device that Wlll have both electrical and mechanicalstrength and which will reduce to a minimum the destructive effect of high frequency energy losses in the insulating material.

Another object of the invention is to provide a device in which damaged parts may be easily and quickly replaced by new ones without the necessity of disassembling the entire device.

A further object of the invention is the provision of a device so designed that should any insulated portion fail, the structure will not part but will retain its mechanical strength.

lVith these and other objects in view, the invention consists in the construction, combination and arrangement of parts as will be hereinafter described.

My insulator, as illustrated in the accompanying drawing, in which shown the pro-- terred embodiment of my invention, may be made entirely of insulating material, it being essential if a single material is used that it have both high compressional and high 30 tensile strength, or if two materials are used that one have high con'iprcssional strength and the other high tensile strength. Or any suitable high compressional strength insulating material and any suitable high tensile strength metal may be used.

As illustrated, my invention consists of a number (it sections A, l3 and C. it being understood that I do not desire to limit in sell, to the number 01 sections shown as it is necessary to use only snilicient sections to distribute the electrical potential sufficiently to avoid tendency to corona eitlect.

The compressional strength insulating material is preferably made into tubular or rodiorin members 5 having any desirable shape and which are seated in any convenient manner. I find a very stilt cement in caps 6 most effective. The caps are provided with flat extensions 7 adapted to be received in sockets 8 carried by channel bars 9.

The channel bars may be of any cross sec-- tion and any desired material having high tensile strength, and the sockets 8 may form an integral part thereof or may be welded or otherwise securely fastened thereto with the end sockets parallel with and the center Serial No. 535,029.

sockets at right angles to the bars. The channel bars of each section are arranged in planes at right angles to each other, and the insulated members extend from the ends of each of the bars to the center sockets of the opposite bars, thus avoiding a mass arrangement of the insulating material interposed between non-insulating parts. Such an open arrangement permits of having a large part of the electric field in air reducing the losses in and destructive heating of the insulating material. 1

The tie rods passing through the bars 9 hold the sections in spaced relation, the distance between the bars of adjacent sections being approximately twice that between the center sockets of each section. These tie rods may be or? insulating or non-insulating material provided only that they have good tensile strength.

In order that the best results may be ob tained, sharp edges and corners should be avoidet particularly at those points in the non-insulating material nearest points in oppositely charged non-insulating material.

It is understood that the above description and accompanying drawing comprehend only the preferred embodiment of my invention, and that minor changes in details of pro portion, combina ion and arrangement of parts may be resorted to without sacrificing any of the advantages of my invention.

Having fully described my invention, what I desire to secure by Letters Patent is:

1. In an insulator, the combination of spaced end bars at an angle to each other, means "for attaching a wire to each extremity or? each of the end bars, and at least tour insulating members one end of each of which is attached to the center of one of the end bars, the other end of each of which is attached to a point near the extremity of the other end bar, for rigidly holding the end bars in spaced relation and angular orientation relative to each other.

2. A suspension insulator comprising a plu 'ality of insulating sections, each section including end bars at an angle to each other, sockets arranged at the ends and in the center of each bar, insulating members extending from the end sockets of each bar to the center sockets of the opposite bar, and tie rods for connecting said sect-ions together.

lVILLIAM F. GRIMES.

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