US1448096A - Strain insulator - Google Patents

Description

Mar. 13, 1923.

L. STEINBERGER. STRAIN INSULATOR.

FILED FEB. 21,1919.

Patented Mar. 13, 1923.

UNITED STATES LOUIS STEINBERG-ER, OF BROOKLYN,'NIEW YORK.

STRAIN INSULATOR.

Application filed February 21, 1919.

To all ii /20m may concern:

Be it known that 1, Louis Srnmnnnonn, a citizen of the United States, and a resi dent. oi the borough of Brooklyn, city and State of New York, have invented certain new and useful Improvements in Strain 1nsulators, of which the following is a speci iication.

This invention relates to strain insulators provided with improved strain members.

One of the objects of my invention is to provide a strain insulator the strain members o l which are so constructed and arranged as to cause a distribution of the electrical stressesand strains within the central portion of the insulator body.

Another object oi the invention is to provide a. strain insulator, the strain members ot which are so constructed and arranged as to eliminate the danger of deterioration or destruction of the insulator body due to the generation of heat inasmuch. as the heat will by my invention be distributed over a large area and not concentrated at a single point in the body thereof.

Another object of the invention is to provide strain members having bridge portions so arranged and situated with respect to each other in the body of the insulator as to form electro-static stress distributors.

Another object of the invention is to provide a strain insulator having co-acting strain members one of which is provided with a ring shaped bridgeportion and the other of which is provided with a bridge portion having a globular projection situ ated within the center of the ring of the first mentioned strain member when the strain members are assembled and partially embedded iu the central portion oi the insulator body.

Other objects will appear from the subjoined specification and claims.

Referring to the drawings:

Fig. 1 is a vertical section with portions in elevation of a strain insulator embot ying my invention.

Fig. 2 is a section on line 2-2 of Fig. l (the flange 12 not shown).

Fig. 3 is a perspective view showing the assembly of the strain members when embedded within the insulator body.

In the drawings in which the same reference character indicates the same part in the several views, is the body of insulating material which is provided with a radially Serial No. 278,427.

extending centrally disposed disc or flange portions ll for the purpose of increasing the surface area of the insulator body to lengthen the leakage path and for protecting the lower portion of the insulator from the weather especially when used as a suspension insulator as the disc portion would then be horizontally disposed. The general shape, however, of the body 10 of insulating material is discoidal as indicated in Fig. 1.

The insulating material used in the construction of the insulator body may be any approved material for that purpose, but I prefer to use the insulating material well known in the art as electrose.

is the integral strain member the legs 21 and 22 of which are joined at their under ends by a bridge portion 23 consisting of a ring 24 integrally connected to the leg portions 21 and 22. The other strain member is a two part structure and 31, the portion 30 of which is embedded in the body of insulating material and has extending portions 32 and screw-threaded as shown. The tree part 31 is secured to the embedded part 30 in a well known wayythat is, the part 31 having screw-threads provided at each 'leg end as shown, abuts the free ends of the screw-threaded portions 32 and 33. The part 31 is then secured to the embedded part 30 by nuts 34 and 35 which engage the respective screw-threads on the adjacent portion of. the strain member, as clearly shown.

The bridge portion 36 of the strain member 30 is provided at the central portion thereof with a projection 37 having a globular end 38.

In assembling the strain members into proper position during the course of manutacture prior to the molding of the body of insulating material thereabout, the globular end 38 of the projection 37 on the bridge portion 36 ot the strain member 30 is placed in the center of the ring 24 of the bridge portion of the strain member 20. The body 0'? insulating material is then molded around and about the strain members in the manner well. known in this art and formed into the shape desired, preferably the shape shown in the drawing and referred to above. It is therefore seen that when the strain members are in use the ring shaped portion 24 of the strain member 20 and the globular portion 38 of the strain member 30 co-act with each other electrically and tend to distribute the electrical stresses and strains llt) which are developed in the central portion of the insulator body, thus preventing concentration of the electrical strains and stresses and lessening to a material degree the concentration of heat, thus prolonging the life oi the insulator.

As changes of construction could be made within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a strain insulator, a strain member having a. ring shaped portion circular in cross section, a second strain member having a globular portion located within said ring shaped portion, and a body oi .insu lating material. within which said rin shaped and said globular portions are embedded.

2. In a strain insulator, a strain member having a ring shaped bridge portion, a second strain member having a bridge portion, and a globular member projecting from said bridge portion into the space within the ring shaped portion of the other of said strain members, and a body portion of insulating material within which the bridge members are embedded.

3. In a strain insulator, a strain member having legs and a ring shaped bridge portion with which the ends of said legs are connected, a second strain member having abridge portion and a globular portion 10- cated within said ring shaped portion, legs whereby said globular member is supported, and a body of insulating material within which said ring shaped portion and said globular portion are embedded.

4. In a strain insulator, a strain member comprising legs and a ring shaped bridge portion with which the ends of said legs are con ected, a second strain member made in two parts and having a bridge portion located below said ring portion, and an upwardly extending globular projection located within said ring shaped portion, and a body of insulating material within which said ring shaped portion, said brid e portion and globular extension are embedded.

In a strain insulator, a strain member having upwardly extending legs the upper ends of which are bent downwardly and are connected with a ring shaped portion, a second strain member made in two parts and having depending legs the lower ends of which extend below said ring portion and are curved upwardly, and which legs are integrally connected with a globular portion located within said ring shaped portion, and a body of insulating material Within which the legs aforesaid and ring shaped and globular members with which said legs are connected are embedded.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 19 day of February, 1919.

LOUIS STEINBERGER. In presence oit G. G. BILLINGS.

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