US1559857A - Lightning arrester - Google Patents

Description

Nov. 3, 1925. 155935? E. A. EVERETT LIGHTNING AERESTER Filed Feb. 11, 1925 4. This invention is constructed along Patented Nov. 3, 1925.

UNITED STATES EDWARD A. EVERETT, OF LONG ISLAND CITY, NEW YORK.

LIGHTNING ARRESTER.

Application filed February 11, 1925. Serial No. 8,322.

To all whom it may concern:

Be it known that I, EDWARD A. Evnnn'rr, a citizen of the United States, and resident of Long Island City, in the county of Queens and State of New York, have inventedcertain new and useful Improvements in Lightning. Arresters, ofwhich the following is a specification.

This invention relates to lightning arresters such as are used on telegraph lines? in railway signaling and has for an object to provide a'device of this kind which issimple in construction, comparatively inex nsive and which cannot readily get out 0 order. These objects are obtained by the construe tion described in the following specification and shown in the accompanying drawings, in which, Fig. 1 is an elevation of an arrester embodying my invention with the-insulated base shownin section, Fig. 2 is a lan view looking on top of the arrester, Fig. 3 is-an enlarged detail, and Fig. 4 is a side elevation corresponding to Fig. 3,;and Figs. 5 and 6 are alternatives to Figs. 3 ariid 1;".8 lines shown in U. S. Patent 1,401,596 issued to me on Dec. 27, 1921, with certain improvements added thereto.

This arrester is of the spark gap. typ, having a block of carborundum or other rcfractory material connected to the ground terminal and metallic strips withsaw teeth surrounding the refractory block and connected to the line wires. The novelty in the present construction resides in maintaining a spark gap of uniform clearance which does not vary with variations in the size of the carborundum block and can be reassembled with precision. 1

In the drawings 11 is the porcelain base of the arrestersupporting the binding post 12 to which the line wire 13 is connected a hole in the porcelain and through a hole 24 in the plate 21 and around the binding post at 19. .In the latter construction the connect1on between the postand coil is readily inspected.

Clamped by the post 12 is the metallic plate 21 and clamped by the post 14 is a similar metallic plate 22. These plates are slotted for the post opening as indicated at 23, Figs. 3 or 5, so as to provide for lateral movement. The central post 25 is provided with a strip connector 26 which may connect to an adjacent arrester or may connect to ground. On this post the carborundum block 27 is placed. This block, as shown, is in 'the form of a wheel and is located in a circular recess in the porcelain base 11.

: Surrounding the periphery of this wheel are the sectors of a ring of insulating material,

preferably bakelite, as indicated at 29 Fig. 3, or at 41 Fig. 5. These ring sectors are narrower than the wheel and fit into semicircular recesses in the porcelain between the projections 28 which prevent the ring sections from rotating.

shown. The ring sectors are thus prevented from rising by the teeth of these plates and the teeth are accurately spaced from the The metallic plates 21 and 22 are formed I wheel by the thickness of the ring sectors if when the lugs 31 bear against 29.

It will be noted that plate 22 engages the *.wheel 27 through the ring sectors on each i -edge and is thereb automatically aligne and the binding post 14 to which the line/with the wheel. It is apparent that the arwire 15 is connected. The terminal posts 12 and 1 1 are usually connected by the choke coil 16 located in a recess in the base itl The terminal postsare provided with squareheads as at 20 which engage a square recess in the porcelain and are thus revented from turning under the tension 0 the nuts on the binding posts. The chokecoil 16 may be connected to the binding posts as at 17 by a binding nut on an extension of the stem of the post, or the end of the coil as indicated at 18 may be brought out through 1rester can be taken apart and reassembled "and the accuracy of the spacing of the spark gap points will be maintained.

In certain types of arrester carbon is formed by the discharge of lightning and which, if accumulated around the discharge points might form a short circuit. For this reason it is common practice to provide a space below the discharge points so that carbon cannot form around these points. This is secured in the alternative construction shown in Figs. 5 and 6. In this con- .struction the insulated ring sector 41 is formed with an annular ledge at 42 and the lugs 43 on plate 22 are deflected to engage the ledge as shown while the. spark gap teeth are located slightly above this sector which, as shown, is comparatively narrow opposite. the teeth. This insures a space below the spark gap teeth while the lugs 43 hold the sector in place against the wheel 27. The lugs43 thus accurately spaces the plates 22 from the refractory block and hold the insulated sectors 41 in place.

Attention is called to the fact that the ring sectors might be made in the form or a complete circle around the wheel but the shown as of circular formation but this invention may be applied with equal results to a rectangular shaped block.

Having thus described my invention, I claim:

1-. A lightning arrester as described comprising an insulated base, a pair of wire terminals on said base, a grounded refractory member between said terminals, ,st rips of insulation placed with their fiat sides against said member and a pair of metallic strips having discharge pointsclamped by said terminals and bearing against strips of insulation.-

2. A lightning arrester as described comprising an insulated base, a pair of wire terminals on said base, a refractory member on said-base between said terminals, strips of insulation placed against opposite sides said flected lugs arranged to engage said insulation strips.

3. A lightning arrester. as described comprising an insulated base, a. pair of wire terminals on said base, a circular refractory member on said base between said terminals, ring sectors of insulation placed in grooves in said base adjacent said member, a pair of metallic plates clamped by said terminals and extended towards said member, said plates arranged toengage said insulation sectors and to hold them in place.

4. A lightning arrester as described comprising an insulated base, a wire terminal and a refractory member on said base, a strip of insulation placed in a groove in said base ad'acent said member, a metallic plate clampe by said terminal, said plate having discharge points extended towards said member and deflected lugs engaging said "insulation strip whereby said teeth are spaced from member.

A lightning arrester as described comprising an insulated base with-a wire terminal, a refractory member, a strip of insulation having aprojecting ridge placed against said member and a metallic plate. said plate clamped by said terminal in discharge relation to said member and engaging the ridge of saidinsulation.

6. In a lightning arrester as described, the combination of an insulating base with a pair of terminals, a refractory member partially enclosed by strips of insulation placed in a groove in said base between said terminals, metallic plates clamped by said terminals in discharge relation to said member .and means whereby said plates and insulatingstripsare engaged in locking'relation.

Signed at New York, in the county of New York and State of New York this 27th day of January A. D. 1925.

.- EDWARD A. EVERETT.

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