Insulator-support for electrical conductors
US 600607 A
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Description (OCR text may contain errors)
INSULATOR SUPPORT FOR ELECTRICAL GONDUGTORS.
No. 600,607. Patented Mar. 15,1898.
Neolfierzedict lav/1 's 0 F a w UNITED STATES PATENT OFFICE.
FRED BENEDICT, OF NILES, MICHIGAN.
lNSUL'ATOR-SUPPORT FOR ELECTRICAL CONDUCTORSI SPECIFICATION forming part of Letters Patent No. 600,607, dated March 15, 1898.
Application filed September 13, 1897. Serial No. 651,552, (No model.)
To all whom it may con/067%:
Be it known that I, FRED BENEDICT, a citizen of the United States, residing at Niles, in the county of Berrien and State of Michigan, have invented certain new and useful Improvements in Insulator-Supports for Electrical Conductors, of which the following is a specification.
This invention relates to an insulator-support for electrical conductors, and pertains more especially to a support for insulators upon crossarms, &c., supporting electriclight, telegraph, and telephone wires.
The object of the invention is to provide a clamp for the cross-arms which will not split or injure the cross-arm due to the strain exerted thereon by the suspended wires.
The invention therefore consists in the parts shown in the drawings, described in the specification, and more particularly pointed out in the claims.
In the drawings, Figure 1 is a perspective view of a portion of a cross-arm illustrating my improved insulator-support secured thereon. Fig. 2 is a transverse vertical sectional view of the support, and Fig. 3 is a longitudinal vertical sectional view of the same.
lIeretofore it has been usual in securing insulators to cross-arms to secure a pin upon the arm, the pin passing through an orifice in the arm. While this construction answers the purpose for which it is intended, itis 0bjectionable for. the reason that undue lateral strain upon the Wires causes the pin to exert a pressure longitudinally of the cross-arm, which, being weakened by the orifice bored therein, splits and the pins pull out and the wires loosen and the cross-arm becomes worthless. To provide for this contingency, numerous devices are employed to catch the wire when the pins pull out.
My present invention consists in a novel clamp to embrace the cross-arm, whereby it is rendered impossible for the clamp to detach from the arm,and consequently splitting of the arm is avoided.
In carrying out my invention I secure to the ordinary cross-arm 1 my improved clamp 2. The clamp comprises a top plate 3, having a transverse groove upon its under side, in which is housed the transverse portion 4 of the strap 5. The top plate 3 is preferably provided with a conical projection 3, which is provided with a vertical orifice through which and through an orifice in the portion 4 of the strap 5 passes a bolt 6, the head 7 resting against the strap, the opposite end being screw-threaded to receive a nut 8, by which means the plate 3 is secured upon the strap. Bolt 6 projects upwardly above nut 8, and secured thereon is a sleeve 9, preferably formed of wood, upon which the insulator proper, 10, is screwed in the usual or wellknown manner. From the transverse por- .tion 4: of the strap 5 depend the side pins 11,
which are bent outwardly upon their lower ends and perforated, forming ears 12.
13 designates aplate perforated at each end, through which perforation and the perforations in the cars 12 pass bolts 14, which secure the plate to the strap and consequently I surface to the cross-arm,which distributes the strain over a large surface, and the clamp is inexpensive of construction and easily applied to the cross-arms.
IVhile I have shown and described the clamp as especially adapted for use upon cross-arms,I wish it understood that the clamp is applicable to insulator-supports of all kinds.
What I claim is- 1. In an insulator-support, in combination with an arm for suspending an electrical conductor, a strap to embrace the support and means for clamping the strap thereto, a bolt carried by the strap and an insulator carried by the bolt, substantially as described.
2. In an insulator-support, a clamp comprising a plate, a strap secured thereto by a bolt, an insulator secured upon the upper end of the bolt and a cross-piece secured to the lower ends of the strap, substantially as described.
3. In an insulator-support, a clamp comprising a top plate having a transverse groove in its under side, a strap arranged in the groove, a bolt for securing the plate upon the strap, an insulator carried by the bolt, and a cross-piece secured to the lower ends of the strap, substantially as described.
4. In an insulator-support, a clamp comprising a top plate having a transverse groove in its under side, a strap housed in the groove, a bolt for securing the plate to the strap, an insulator secured upon the bolt, the said strap having depending ends, perforated ears projecting outwardly from the depending ends and a cross-piece secured to the ears,
substantially as described.
5. I11 an insulator-support, in combination with a cross-arm, a clamp comprising a top plate having a conical projection extending