US975417A - Electric-circuit switch. - Google Patents

Description

V E. W. HARRIS. ELEGTRIG CIRCUIT SWITGH. APPLICATION FILED JAN 10, 1903.

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ELEOTRIC-CIBCUIT SWITGH.

To all whom it may concern:

Be it known that I, FORD W. HARRIS, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electric Circuit Switches, of which the following is a specification. i v

My invention relates to switches for electric circuits, and it has special reference to such knife-blade switches as are adapted to interrupt relatively high voltage circuits.

The object of my invention is to provide a device of the aforesaid class that shall be particularly rigid and durable in construc tion and that may be readily actuated by an attendant from a material distance, by means of a pole having a hooked extremity,

Manually operated disconnecting switches are often employed in the circuits of transformers and other high voltage electrical apparatus for rhe purpose of interrupting the supply of energy which is continuously received, under normal conditions, by such devices. The blades of these swilchcs are necessarily of considerable lengthin order thatthe contact terminals may be widel separated from each other when the switc is 0 on, and the joint between the switclh bla e and the terminal to which it is pivoted is made relatively stili in order to maintain the proper alinement of the switch parts.

I According to my present invention, I em-- ploy improved means for securing the con tact members of the switch to a rlgid plate I or slab, whereby they are adequately insulated therefrom and from each other and,

at the same time, a particularly strong and rigid connection is made for resisting the strains incident to the opening and closing gof the switch-blade which may be stifily joined to one of the contact members, as above indicated.

Figure l of the accompanying drawings is a side elevation, partially in section, of a switch constructed in accordance with my invention, and Fig. 2 is a front elevation of the device shown in Fig. 1.

Referring to the drawings, the device here illustrated comprises a slab or base 1 which may or may not be coi'istructed of insulating material, posts or supports 2 and 3, of porcelain or other suitable insulating material, contact members 4 and 5, which are respecvifl L Paterni- Patenied Nova in, aerial Application filed January 10, 1908. eriai No. 4103MB. I

tivcly secured to the posts 2 and-3, and a switch-blade G which is pivotally seonro l the contact member 5.

The posts 2 and 8 are similar to or find the post may he considered trative of both. This post or support coin, prises a frusto-conical body member '3 5 mg a corrugated carer surface and stanlially cylindrical inn end or tion 8.. The diamelzer (il the pr end 8 is materially lees than the aincter or the hody so formed at the, juncision or i length of the projection 8 i stantially' to the ihiclcn: slab 1 ,whichis prm'ided i which the projection l hole being provided with coimter- Til on the opposite side of then-lab the body of the post In ihis way, an annular pocketis formed, when the post is assem bled. with the shoulder in engagement with the face of the slab, which is filled with 4 lent. to rigidly secure the post to the In. order to still further improve the ing power of the joint thus formed,

i 1 hole int the 8 is provided with an annularliange 12 insulating post 2, a projection 17 which is integral with the cap and extends into the recess 14 and a slotted projeciion 18 to which switch jaws 19 arose/cured means of pins 20 and by sweating or calla" cap 16 is also provided with a projection 21 to which a terminal member 22 is secured by a bolt 23., The projection 1? is provided with side recesses, as indicated, to receiye portions of the cement which is placed in the recess )4. The clearance spaces under outer extremity of the cylindricalprojection which is interrupted at intervals by notches I which fits over the outer corrugation oi? the dale 1 g, ,The,

{the edges of the cap and between the cap and the outer corrugation ot the post are also filled with cement. The grooves 15 and the recesses in the projection lT'enable the cement, when set, to hold the parts securely in position. It is evident that the caps serve merely to provide additional security and rigidity between the insulation and the con tact members and, consequently, that they may be varied in form or dimensions, or

'both, or be omitted altogether, if desired.

The contact member 5 is similar to the contact membert and corresponding parts are designated by the same reference char-- acters. The switch jaws 19, however, are provided with holes 21 to receive a bolt 25 which projects through the switch-blade 6 to form a hinge-connection for the blade.

The switch-blade 6 may preferably be built the shape and size of the parts illustrated may be effected within the scope of my in vention as defined inthe appended claims.

I. claim.,as my invention:

1. In a switching device, the combination with upporting slab provided with holes havi g ear enlargen'iei'its, frusto-conical insulating posts havin ifecesses in their outer ends and substantialfy cylindrical inner ends provided with flanges and located in said holes, bodies of cement surrounding said omen parts within the holes, contact members comprising caps fitted over the outer ends of the postsand having projections located in said recesses and cemented therein, switch jaws projecting outwardly from the caps, and a switch-blade pivotally secured to one pair of the jaws.

2. In a switching device, the combination with a supporting slab having holes cut throughfit and countei ml: at the rear, frnsto-conical insulating posts projectin outwardly from the face -of the slab an having corrugated outer 'surfacesa-nd end recesses and provided ,With cylindrical flanged inner ends which'are cemented into said holes, of caps having projections cemented into the recesses in the posts, switch jaws projecting outwardl from the caps, and a switch-blade pivotaily secured to one pair of jaws.

' 3. In a switching device, the combination .With a supporting slab having holes cutthrough it and counter-sunk at the rear, frusto-conical insulating posts having corrugated outer surfaces, and substantially cylindrical flanged inner ends cemented into said holes, of contact members comprising caps titted over the outer ends of the posts, projections cemented into recesses in the posts, switch jaws pr'ojectingirom the caps, and a switch-blade pivotally secured to one pair of the jaws.

In testimony whereof, I have hereunto subscribed my name this 31st day of Dee., 1907.

FORD W. HARRIQ.

Witnesses:

HERBERT i5 ABER, BIRNEY Hume.

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