Publication: Electrical World
New York, NY, United States
A simple, efficient and readily-adjustable insulator support is being placed on the market by the Clarke Electric & Specialty Manufacturing Company, Minneapolis, Minn.
This insulator is designed for supporting on cross-arms overhead wires of all kinds, and its construction is such that the usual boring of holes in the cross-arms for insulator pins is entirely done away with. As will be seen from the illustration, Fig. 1, the insulator support consists of a yoke adapted to embrace the cross-arm, and provided at the lower end with bolt and nut to tighten the device in place.
This support can be adjusted to the cross-arm at any desired point and rigidly clamped in position. Since by its use it is not necessary to bore holes in the cross-arms the life of the latter is greatly prolonged. One of the causes of the deterioration of cross-arms is the decay brought about by the action of the water and moisture getting into insulator-pin holes.
Another advantage this support offers is that smaller cross-arms may be used, for the reason that a relatively smaller one without holes will have as great strength as a larger one bored with holes for the old style insulator.
The support can be quickly and conveniently applied or removed, and where there are more wires on one side of the pole than on the other, an efficient balance can be easily effected by re-adjusting the supports.
Fig. 2 shows four supports clamped to a cross-arm, and Fig. 3 gives a cross-sectional view of a cross-arm and clamp.