US1869877A - Pole fitting - Google Patents

Description

g- 1- A. o. AUSTIN 3 9 POLE FITTING F iled May 16, 1950 Fifi 1N VEN TOR M770) 0. ,41/5/7/1.

Wa m e A TTORNEY in Fig. 1.

. nation with the insulator.

Patented Aug. 2, 1932 NITED STATES PATENT OFFICE.

ARTHUR O. AUSTIN, OF NEAR BARBERTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE OHIO BRASS COMPANY, OF MANSFIELD, OHIO, A CORPORATION OF NEW JERSEY ro n FITTING Application filed May. 16,

with the electrostatic field'nor direct electrical discharges toward the center of the pole.

Other objects and advantageswill appearv from thefollowing description. I The invention is exemplified in the combination and arrangement of partsshown'in the accompanying drawing and described in c the following specification, and-it is more particularly pointed out in the appended claims. a

In the drawing:

Fig. 1 is a plan of a'fitting showing one embodiment of the present invention.

Fig. 2 is an elevation of the fitting shown Fig. 3 is a fragmentary plan of a modified form of the invention. WVood supports are frequently used for holding up the insulators of power conductors. In order to prevent interruptions due to flashover, of the service supplied by the power conductor, particularly under lightning conditions, it is frequently advisable to make use of the resistance of the wood to flash over under high voltages. It is frequently possible to develop an even'hi'gher flashover in the wood than in an insulator where the wood is used efiiciently in combi- It is comparatively easy to develop this high insulation on a normal structure where metal parts tending to out out the insulation'of the pole are not necessary. On guyed structures,

however, the metallic guy running to ground eliminates a large part of the insulation and there is a tendency for the remaining part to be shattered by heavy electrical discharges produced by lightning. In most cases, the damage is greatly aggravated where any conductor member penetrates the pole. Because of electrostatic influence, there is atendency for a discharge caused by lightning to take the center of the pole or Wood member.

1930. Serial No. 453,064.

Therefore, if a discharge is once started in the center of the pole,'it' may cause serious shattering. In order that this discharge may be kept away from the center of the pole, it is advisable to keep attachments on the outside, using as few projecting or entering points as possible. F or attaching guy insulators, it is possible to use a cable or wrapping around the pole which, although it eliminates penetrating members in so 'far as the cable is concerned, generally requires the use of lag bolts or other means for bold ing the cable up. I

Where ordinary split bands formed of straps are clamped to apole and a guy or strain insulator is attached to the ears of the band on one side of the pole, there is a tendency for the band to pull down on this side, making it necessary to use lag bolts or other supports for taking the vertical load. The penetration of these lag bolts or spikes tends to form a point of entry for any severeelectrical dischargetraversing the pole.-

With the improved type of fitting com prised in the present invention,the load is apf plied approximately at diametrically oppo site points in a clamped band, so that the vertical component will be almost equally distributed around the pole. This makes it comparatively easy to maintain the position of the clamp. Any slipping which is due to unequal loading on the side is also; avoided. With this scheme it is possibleto attach a strain insulator'in a preferred location so that a high effective flashover will, be developed even for the guyed structure. It is highly desirable to keep the effective capacitance of the fittings small so that over-stress will not develop, thereby lowering the effective fiashover voltage. Owing to the variation in pole diameters, a fitting must be provided which will have considerable range of adjustment. It is also desirable to provide a fitting which will distribute the load over the pole so that damage to the outer fibers 'under the bearing area will be avoided. Itis also highly desirable to produce a reliable fitting and meat low cost. The type of fitting shown in the'drawing makes it possible to holdthe strain insulator in a definite posi' -ti'ons attached to tion, and is relatively low in cost and easily installed.

In the form of the invention shown in Fig. 1, arcuate clamping members or straps are 5 formed into the shape illustrated by pressing or other suitable manufacturing processes. The members are relatively thin and therefore can be made to conform .to the pole .readily,.and, at thesame time, provide a wide lbea-ring area'between .the band and .the pole.

Sockets or bosses 11 are provided with suitable holes for the tightening bolts 12. .These bolts may have a long threaded portion permitting of a material take-upto accommodate 15 various sizes of poles or, if desired, different lengths of bolts maybe used, or bolts having a nution each end. With-this type zof=conzstnu'ction, there :isa certaimamountzof resiliiency in the bands :so that they will have a tendency to .stay tight eyenthough the pole ichan'gesits diameter under changes in atmospheric conditions. In general, itis prefer able to provideiextensions 13 beyond thersockfets 11 at the LGIlClS of the. straps. These re-Xtenisionsmay beanade long if desired so thatithe tendency .for the band :to bend at the socket will 'be reduced. If desired, the ends i3 may be made to overlap. In general :these ends EHTB curved slightly outwardly so :that there will be no tendency :to dig :into {the fibre in clamping-up. ln'order thatthe 'verticalicomiponent of the forceon the abandimay be :dis-

itributed, the attachment ismade through two bosses :15, substantiallydiametrically opposite .each other, through which the link 16 passes,

in :the form shown in :Fig. :3, bolts 20 are located in sockets 21 and form trunions for fiche link:22. This latter arrangement gives a 40 'wide range of vertical movement for the at-' 'ta'chment'link zor voke 22. If desired, the bands 10 may :be provided with a number of small teeth 23 which grip the pole but, at the same time, do not project into the ;pole any great-distance. Where these-are located well ztoward the center of :the band, they will :be more :or :less screened electrically by the remaining portion. The teethmav bemade hy punching sections in the band or by welding 1m small points. ,I-fdesired. theflbolt member 20 may be given a point 24 which will be drawn in'tio the pole ifor gripping.

.I-claim: l. A fitting :for attaching a guy :to a pole xoomprising a band for-grippingthe :poile,.said lband being splitat approximately diametrically opposite :positions on said pole, said positions lying approximately in the vertical plane ofthe guy, the guy havingbranch porthe respective portions of said band :at opposite portions of said pole and in a vertical plane ;at air-angle %to :the vertical plane of said 21W.

7 2. A' fittingfor-attaching a'guyto a pole comprising a pair :of arcuateclamping memsaid lug.

.memb-ers about a pole.

4;. A 'fitting for awood pole comprising a :metal strap having aihollow lug pressed outwardlytherefrom between the ends thereof, 'saidlug beingperforated, and an attachment bolt extending through the perforation of 5. Afitting for securing a guy to a wood pole comprising a pair of metal straps, each having a Elug pressed outwardly at the mid 'portionathereof, and an attachment yokehaving the :ends thereof secured to said lugs 99 respectively.at-oppositesid-es of the pole.

'6. A'fitting for attaching a guy tola wood pole comprising-apair of arcuate straps having lugs at their mid portions, adjustable means for drawing the ends of said straps together to'clamp said fitting about a pole, and a yoke having the ends thereof secured to said lugs.

7. A fitting for a wood pole comprising a pair of arcua'te straps having lugs project ing radially from the mid portions thereof respectively, means for clamping said straps to a wood pole, and an attachment yoke having the ends thereof projecting through said lugs .in a .direction transverse -.to the axis of theipole.

8. A fitting for securinga guy to a wood pole comprising a pair of arcuate straps hav- .ing lugs projecting radially from the mid portions thereof respectively, means for clampingsaid straps about a pole, trunnions projecting radially from said lugs, and a yoke ,pivotally mounted on said trunnions.

.9. A fitting for attaching a guy to a pole comprising (an arcuate strap having .a lug' projecting outwardly therefrom, a trunnion secured to said lug and having a pointed end for penetrating the surfaces of the pole to prevent saldstrap from slipping.

10.An attachment fitting comprising' curved straps, a yoke means for attaching opposite ends of said yoke to the mid portions of said straps respectively, and threaded means for connecting the ends of said straps and for drawing said straps tightly about" an enclosed member.

11. An attachment fitting comprising a pair of arcuate straps having lugs pressed outwardly therefrom at their mid portions respectively, a yoke having its ends secured to said lugs, outwardly extending lugs formed on said straps adjacent the respective ends thereof, and a threaded bolt extending through said last named lugs .for drawin the ends of said straps together to clamp said straps upon an enclosed member.

12. An attachment fitting comprising'a pair of curved straps, means for attaching a yoke to the central portions vof said straps respectively, and means for drawing the ends of said straps together to clamp said straps about an enclosed member the ends of said straps being inclined outwardly to prevent said ends from entering the surface of said member as they are drawn together.

In testimony whereof I have signed my name to this specification this l lth'rday of May, A. D. 1930.

ARTHUR O.-AUSTIN.

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