Patented Dec. 16, 1941.                                                                      2,266,340           

UNITED   STATES   PATENT   OFFICE.

2,266,340

INSULATOR

 

Nevin Y. Sindlinger, Toledo, Ohio

Application February 29, 1940,   Serial No. 321,502  

4 Claims.  (Cl. 174-175)

This invention relates to insulators and particularly, but not exclusively, to devices of this character for mounting electricity conductor wires on the cross arms of a pole or other suitable support and has for one of its objects to provide, in a manner as hereinafter set forth, an insulator of the character described having means embodied thereon for detachably but rigidly securing the conducting wires thereto without the use of extraneous fastening means such as tie wires.

Another object of the invention is to provide an insulator of the character described with means for attaching the wires thereto so the wire will be frictionally held from pulling longitudinally therethrough even though the wire on one side of the insulator should be broken.

Other objects of the invention are to provide an insulator of the character set forth which will be simple in construction, strong, durable, efficient in its use and which may be manufactured at low cost.

Other objects and advantages of the invention will become apparent from a study of the following specification; taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a top plan view of an insulator constructed in accordance with this invention;

Figure 2 is a fragmentary sectional detail view taken substantially on a line 2-2 of Figure 1;

Figure 3 is a view in side elevation of the insulator; and

Figure 4 is a view in side elevation taken at right angles to Figure 3.

Referring to the drawing in detail, the reference character 10 designates the body portion of the insulator which may he formed of any suitable material such as glass, porcelain, and the like, the body portion being provided in its lower end with a threaded socket as at 11, for receiving the upper end of a supporting pin (not shown). The head or dome portion 12 of the insulator body 10 is provided with a transversely extending vertical groove 14 which extends downwardly a suitable distance from the uppermost portion of said dome.

A pair of locking slots 18 and 19 extend inwardly from opposite aides of the dome 12 and on opposite sides of the slot or groove 14 therein to a point just beyond the center of the dome, as indicated in dotted lines by the reference numerals 20 and 21 in Figure 1 of the drawing. It will thus be seen that the innermost portion of the locking slots 18 and 19 communicate with each other. As seen most clearly in Figure 3 of the drawing, the locking slots 18 and 19 are of substantially V-shaped formation and communicate with the adjacent portion of the slots 14 on their inner sides and the outer portion of said slots extend at an obtuse angle in substantially a horizontal plane, as indicated by the reference numerals 22 and 23. The reference numeral 25 in Figures 1 and 4 of the drawing represents, in dotted lines the lowermost or crotch portion of the slots l8 and 19. The innermost portion of each of the slots 18 and 19 are provided with aligned lateral grooves or depressions 26 (see Figure 4) for the reception of the conductor wire designated by the reference numeral 21.

 The wire 27 is mounted on the insulator 10 by inserting the same in the slot 14 and moving said wire downwardly therein to the bottom of said slot after which the portions adjacent the opposite side are inserted in the respective grooves

or slots 18 and 19 and drawn thereinto until engaged with the inner end of the slot after which the wire is disposed in the groove 26. The wire may be thus positioned by rotating the insulator one quarter of a turn on its supporting pin. It will thus be readily apparent that the wire is mounted on the insulator in such a manner that the accidental displacement thereof will be prevented. The substantially V-shaped locking slots 18 and 19 will cause the wire to be crimped when the same is inserted therein and will provide frictional means for preventing the wire from pulling longitudinally out of the slots should an excessive strain be placed on one side of the insulator, such as would occur when the wire becomes broken on the opposite side.  As particularly noted in Figure 2, the lowermost portion of slot 19 is tapered from its interior, downwardly and outwardly to provide for drainage, slot 18 being similarly formed.

It is believed that the many advantages of an insulator constructed in accordance with this invention will be readily understood, and although the preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the details of construction may be made without departing from the spirit and scope of the invention.

What I claim is:

1. In an insulator of the character described, a body portion, an integral dome portion, and means formed in the dome portion for receiving and retaining a wire against longitudinal and transverse movement with respect thereto, said means comprising a longitudinally disposed transversely extending entrance slot and transversely disposed locking slots, said locking slots communicating with the inner end of the entrance slot and having a longitudinally disposed V-shaped portion on each side thereof.

2. In an insulator of the character described, a body portion, an integral dome portion, and means formed in said dome portion for preventing longitudinal and transverse movement of a wire with respect thereto, said means comprising a longitudinally disposed transversely extending entrance slot, transversely disposed locking slots communicating with the inner end of the entrance slot, said locking slots being of longitudinally disposed V-shape and having aligned grooves at their end portions.

3. An insulator of the character described comprising a unitary body and dome, said body being threaded for connection to a support and said dome being formed with a longitudinally disposed transversely extending entrance slot and a transversely disposed locking slot in communication with and at right angles to said entrance slot and having a longitudinally disposed V-shaped portion on each side thereof to prevent longitudinal and transverse movement of a wire with respect to said insulator.

4. An insulator of the character described comprising a unitary body and dome, said body being threaded for connection to a support and said dome being formed with a longitudinally disposed transversely extending entrance slot and transversely disposed locking slots in communication with the entrance slot, said locking slots being of longitudinally disposed V-shape and having aligned grooves at their end portions, and said entrance and locking slots being substantially at right angles whereby one quarter rotation of the insulator transfers a wire from the entrance slot to said locking slots.

      NEVIN Y. SINDLINGER.