US806887A - Insulator-pin. - Google Patents

Description

No. 806,887. PATENTED DEC. 12, 1905. W. T. GODDARD. INSULATOR PIN.-

APPLIGATION FILED MAY 24, 1905.

a. D jg D lizornezfs.

UNITED STATES PATENT OFFICE.

WALTER T. GODDARD, OF VICTOR, NEW YORK, ASSIGNOR TO THE LOCKE INSULATOR MANUFACTURING COMPANY, OF VICTOR, NEW YORK.

INSULATOR-PIN Specification of Letters Patent.

Patented Dec, 12, 1905.

10 alt wltoin it may concern.-

Be it known that I, WALTER T. GODDARD, a citizen of the United States, residing at Victor, in the county of Ontario and State of New York, have invented a new and-useful Improvement in Insulator-Pins, of which the following is a specification.

This invention relates to metallic securingpins for large insulators of the kind used for supporting conductors for high potential electrical currents. These pins have been constructed of a base or standard having a broad bottom which rests on the cross-arm or support and a bolt or shank which is connected to the lower portion of the base and is adapted to be secured in a bolt-hole in the cross-arm or support. WVith such construction the strength of the pin depends upon the tensile strength of the material forming the base, and the base is therefore commonly made of malleable iron or steel.

The object of the invention is to construct an insulator pin of the minimum number of parts so combined as to secure the greatest mechanical strength and durability and lessen the cost of manufacture of the pin.

In the accompanying drawings, Figure 1 is an elevation of an insulator-pin embodying the invention. Fig. 2 is a sectional elevation thereof. Figs. 3 and 4 are cross-sections thereof in lines 3 3 and 4'4, respectively, Fig. 1. Fig. 5 is a fragmentary section showing a different arrangement of the connection between the base and bolt.

' Like letters of reference refer to like parts in the several figures.

A represents a base or standard which consists of a hollow column preferably having a broad flat bottom a and vertical strengthening ribs or webs a, radiating from the column and connecting the same with the base. 7

B represents a bolt which passes longitudinally through the base, having a threaded lower end which depends below the base for attachment to the cross-arm or support and a relatively long head or upper portion 6,

which projects above the top of the base and l forms a shank adapted to enter and be secured in the hole of the insulator. The head of the bolt is preferably provided with longitudinal ribs or webs, which insure a better hold of the head in the cement in the hole of the insulator and at the same time afford shoulders t at their lower ends, which bear against the top of the base and support the projecting head or portion of the bolt against bending. The bolt is positively secured in' or interlocked with the base in some suitable way to prevent a relative longitudinal movement between the bolt and the base, so that in the event the wood cross-arm shrinks, the base cannot fall away from the head of the bolt, and thus deprive the bolt from the lateral support secured by the bearing of the head-ribs on the top of the base. The bolt could be thus secured from longitudinal movement in the base in various ways. Preferably the bolt is screw-threaded at c, Fig. 2, adjacent to its head for engagement with a cooperating thread at the top of the base. This location of the thread is preferred, as the enlargement for the thread can be forged in one operation with the head, which could not be done with a different location of the thread. Another connection of the bolt and base is shown in Fig. 5. In this construction the bolt is screw-threaded at its lower portion at d and is screwed into an internal thread at the bottom of the base.

In a pin constructed as described the base is only subjected to crushing strains and can therefore be made of cast-iron, which is much cheaper than malleable iron or steel without sacrificing any strength in the pin. The bolt which takes all tensile strains can be forged from steel at small expense, and when the two parts are constructed and connected as described a strong, durable, and efficient pin is the result. The pin is much more rigid and durable than one in which the base and attaching-head for the insulator are made of separate pieces joined by a bolt passing through them.

I claim as my invention 1. An insulator-pin comprising a hollow base and a bolt which passes through the bore of said base and is secured in the base from longitudinal movement by means independent of the support to which the bolt is attached, said bolt having an enlarged head portion which bears at its inner end upon the end of the base and projects for a considerable distance beyond the base to provide an attaching-shank for the insulator, substan-' tially as set forth.

2. An insulator-pin comprising a hollow base, and a bolt which passes through said base, said bolt having a head portion provided with ribs which bear at their inner ends on the end of the base and project for a considerable distance beyond the base to pro vide an attaching-shank for the insulator, substantially as set forth.

3. An insulator-pin comprising a hollow base, and a bolt which passes through said base, said bolt having an enlarged head portion which bears at its inner end on the end of the base and projects for a considerable distance beyond the base to provide an attaching-shank for the insulator, said bolt and base having interlocking parts which positively hold them from relative longitudinal movement, substantially as set forth.

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