US947239A - Weatherproof high-tension fuse. - Google Patents

Description

Patented Jan. 25

E. H. JACOBS.

WEATHERPROOF HIGH TENSION FUSE.

APPLICATION FILED AUG. 20, 1909.

UNITED STATES PATENT OFFICE.

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OI SOHEKEOTADY, HEW YOIK, ABSIGIOB TOG ELECTRIC comm, A CORPORATION 01 YORK.

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p fica of L t Patent Patented Jan. 25, 1910 Application filed August 20,1909. Serial Io. 818,777.

To all whom it may concern:

Be it known that I, Enmns'r H. JACOBS, a citizen of the United States, residin at Schenectady, county of Schenectady, tate of New York, have invented certain new and useful Im rovements in Weatherproof High-Tension uses, of which the following lifisa specificatio mvention relates to transmission hnes ca mg electric current of hi h tension and its object is to furnish suc lines with thermal cut-outs which will be efl'ectuall protected from the weather and etwillbe y capable of rapid renewal when ru tured by an abnormal rush of current. 11 a device of this kind several conditions must be met to insure successful operation. For instance, the fuse is necessarily out of doors, and therefore it must be so thoroughly insulated that no storm of rain, sleet or snow can cause a breakdown to ground. Moreover, the insulation must be able to withstand not only the working potential but the excessive potentials due to lightning or to surges caused b switching. It must also be able to stand t e heavy momentary rush of current which follows the are developed at the instant the fuse ru tures. The fusible element must be easi y removable and replaceable with a minimum of danger to the linemen, and when it volatilizes the blast of burning ases must not occur in proximit to com ustible or conducting portions of t e system.

My invention aims to meet these requirements and to this end it com rises the combination with a main line an ductor of a connection between ,them including an inclosed expulsion fuse and an upright waterproof, weatherproof housin for said fuse composed of a lurali ty 0 bells made of insulating materia nested one inside another and covering substantially the entire fuse. The-housin isstationary, but the fuse is removable t erefrom in a downward and lengthwise direction, being.

a branch conned, if necessary, without removingis an elevation, partly in section of an embodlrnent of my invention whic has been put in practice -2 is a sectional eleva-' tion of the bulb, t e spring contacts and buffer at the upper end of the fuse, and Fig. 3 is a plan view of the support for the lower end '0 the fuse and its housing. i

The, device is preferably mounted on and between two cross-arms 12 of a pole, tower or other line-carrying structure, preferably by means of brackets 3-4 secured to the u er arm 1 and a bracket 5 secured to t e ower arm 2. Depending from the bracket 3 is an insulator .6 of any approved design, havingv a downwardly extending pin 7 to whose lower end is attached a plate 8 to which the line wire 9 is fastened. The plate 8 is provided with a hinge clip 10 to which is pivoted the blade 11 the disconnecting swltch.

The bracket 4' supports another insulator 12 having a downwardly extending pin 13 to whose lower end is secured a laterally-projecting support 14. A contact-clip 15 for the blade 11 is attached to this support and adjacent thereto is a s ring safety-clip 16 for holding the blade 0 osed. A cross-piece 17 on said blade enables the line-man to open and close the disconnecting switch with a pole carrying a -hook at its upper end.

The pin 13 projects below the support 14 and is screw-threaded to receive a nut 18 which clamps up against the support a sheet of metal having ,a plurality of downwardly projecting spring contact fingers 19. The up er en of the casing for the inclosed expu sion fuse engages with said fingers. Said casing is preferably composed of a stout metallic bulb 20 from which extends a tube or are chute 21 of. insulating material. The convex surface of. the bulb enables it to wedge apart the fingers when thrust up between them, so as to insure a good electrical connection between the support 1 1 and the bulb. A buffer is interposed between the end of the pin 13 and the bulb, consisting preferably of a helical spring 22 soldered at one end to the nut 13 and at the other to a cap 23, which preferably has a recess for the head of the plug 24.- screwed into the top of the bulb.

The fusible wire or strip 25 is soldered at its upper end to said plug and runs down through the arc chute 21 to a tip 26 to which i it is soldered. This tip is attached to a metallic sleeve 27 surrounding the lower end of the chute. Radial arms 28 project in opposite directions from the sleeve and are adapted to pass up through slots 29 a shelf or lower support 30 secured to an insulator 31 mounted on the bracket 5. By giving the chute 21 a quarter turn the arms will engage, by a bayonet-joint action, with. spring contact cli s'32'secured upon the u per side of the she f 30. The branch con uctor 33 is connected to the shelf so that the circuit from the line wire is com leted through the disconnecting switch-bla e 11, the upper support 14, the contact fin ers 19, bulb 20, fuse wire 25, sleeve 27 an shelf 30 to the branch wire 33.

A waterproof and weatherroof housing of insulating material surroun s the fuse casing, extending from the shelf 30 up to the insulator 12. This housing consists preferably of a tier of tubular sections 34, preferably made of fiber, and each provided with a flaring hell or petticoat 35 into which the upper end of the next lower section fits with a tight joint. The top of the upper section is received in the petticoat of the insulator 12, and the bell of the lowermost section seats over a circular flan e 36 on the shelf 30, concentric with the tu e 21. The superposed sections are of sufficient diameter to permit the bulb 20 to pass up through them readily, and leave an ample air space between said bulb and said sections. The housing a rigid structure independent of the fuse casing. The fuse casing with its inclosed fuse is thrust up through the hole in the shelf 30 until its bulb is grasped by the contact fingers 19 and abuts against the buffer cap 23. 'In this position the arms lie just above the shelf 30 so that they can be engaged with the spring clips 32 by giving the chute a quarter turn. When the fuse blows, the blast of flame and vapor rushes down through the arc chute at one side of the insulator 31 and far enough away to do no damage. The fuse casing is readily disengaged and removed for refusing, without disturbing the housing. The flaring bells on the housing give ample protection to the joints between the sections, and afford a long creepage surface between the upper support 14 and the shelf 30; a large portion of said surface being always dry. v

In accordance with the provisions of the patent statutes, I have described the principle of operation of nay-invention together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown'is only illustrative, and that the invention can be carried out by other means. What I claim as new and desire to secure by Letters Patent of the United States, is 1- 1. The combination with a line wire and a branch wire, of an inclosed expulsion fuse connecting the same, and a sectional housing 'of insulating material inclosing said fuse.

2. The combination with a line wire and a branch wire, of an inclosed expulsion fuse connecting the same, and a sectional housing of insulating material inclosin said fuse, said housing being open at the ower end to admit said fuse.

3. The combination with a line wire and a branch wire, of an inclosed ex ulsion fuse connecting the same, a sectiona housing of insulating material inclosing said fuse, and in disconnecting switch in series with said 4. The combination with a line wire and a branch wire, of an insulator for the line wire, a switch blade connected to line and pivotally supported by said insulator, an insulating tubular housing, a connection for the branch wire at one end thereof, and an inclosed expulsion fuse removably secured in said housing and closing the circuit be-,

tween said switch and branch wire.

5. The combination with a line wire and a branch wire, of an inclosed expulsion fuse connecting the same, and a housing for said fuse consisting of a plurality of superposed tubular sections of insulating material ointed to ether.

6. he combination with a line wire and a branch wire, of an inclosed expulsion fuse connecting the same, and a housing for said fuse consisting of a plurality of superposed tubular sections of insulating material jointed together, each section having at its lower end a flaring bell protecting the joint with the next lower section.

7. The combination with a line wire and a branch wire, of insulators respectively supporting said wires, a shelf on the branch wire insulator having a slotted opening, a tier of tubular sections of insulating material resting on said shelf, an inclosed expulsion fuse housed by said sections and depending through said opening, an insulator receiving the upper end of said tier, and connections between the line and branch wires including said fuse.

8. The combination with an insulator, of contact fingers and a buffer supported thereby an inclosed expulsion fuse having a bulb engaging said fingers, a shelf having a slotted opening, a fuse-inclosing arc chute having radial arms adapted to pass through said opening, contact clips on said shelf adapted to be engaged by said arms by a quarter turn of said chute, line and branch wires, and aconnection between said wires including said fuse.

9. The combination with an insulator, of contact fingers and a buffer supported thereby, an inclosed expulsion fuse having a bulb engaging said fingers, a shelf having'a' slotte opening, a fuse-inclosing arc chutehaving radial arms adapted to pass through receiving the upper end of the next lower said "opening, contact clips on said shelf section. 10 adapted to be engaged by said arms by a In witness whereof, I have hereunto set quarter turn of said chute, line and branch my handthis 19th day of August, 1909.

wires, a connection between said wires in- ERNEST H. JACOBS. eluding said fuse, and a housing for said Witnesses: fuse composed of a tier of tubular sections BENJAMIN B. HULL,

of insulating material, each having a bell THOMAS W. NooNAn.

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