US 1007138 A
Description (OCR text may contain errors)
G. L. PBIRGE, JR.
INSULAI'OB BRACKET. V APPLICATION IILED OUT. 26, 1910. 1,007, 1 38, Patented Oct. 31, 1911.
UNITED STATES PATENT OFFICE.
c'HAnLEs L, Pnmcn, an, or rrr'rsnonon, riiNNsYLvANIA. AssIeNoR 'ro HUBBARD & 60., or PITTSBURGH, PENNSYLVANIA, A oonroaA'rxoN or PENNSYLVANIA.
Specification of Letters Patent. Patented Oct, 31, 1911.
Application filed October 26, 1910. Serial No. 589,091.
To al whom it may concern.-
Be it known that I, CHARLES L. PEIROE, J r., a resident of Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented certain new and useful Improvements in Insulator-Brackets, of which the following is a full, clear, and precise speci fication.
My invention relates to insulator brackets, and particularly to such brackets constructed entirely of metal.
The more modern insulator brackets usually comprise a narrow back piece to which several lnsulator supporting members are fastened, preferably by being riveted thereto, and bolt holes are provided in the back piece for securing said piece to a support. The back piece and brackets are usually bent up and formed of stock material, 'such as channel iron. It has been found in practice, however, that the narrow back piece will not give proper bearing on the wall or other support when wires pull off from the side of the support. Another objection to this form of bracket is that,owing to the position of the bolt holes some distance either above or below the point of strain of wires pulling from the insulators, the back piece has a tendency to bend at the bolt holes. -The strength and stability of the insulator is, therefore, greatly reduced.
The object of my invention is, therefore,
.to devise construction and arrangement for overcoming these defects, yet at the same time to produce an insulator bracket which will cost no more to manufacture than these prior insulators referred to, and whose strength, stability and general efficiency will be greater.
My invention will be clearly understood from thefollowing specification and by reference to the accompanying drawings, in
' which several embodiments for carrying out my invention are described and shown.
In the drawing-Figure 1 is a perspective view, showing one form of back piece having a single longitudinal corrugation or strengthening rib which fits inside the channel supports, Fig. 2 is a cross-sectional view taken on plane 2-2, Fig. 1, Fig. 3 is a per-j spective view of a bracket, in which the back piece has two longitudinal corrugations or ribs, between which the supporting members fit, Fig. 4 is a cross-sectional view taken onplane 4'4, Fig. 3, Fig. 5.is a perspective view of a bracket, showing a back piece having a central longitudinal corrugation or ridge and openings through which the brackets can pass to engage within the corrugation or rib, Fig. 6 is a sectional view taken on plane 6-6, Fig. 5, Fig. 7 is a perspective view, in which individual corrugated straps are used to receive both the back piece and the supporting members, Fig. 8 is a sectional view taken on plane 88, Fig. 7, Fig. 9 is a perspective view, showing a slight modificationover the form shown in Fig. 7 and F ig.=-'-l0 is a sectional view taken onplane l010, Fig. 9.
In the modified forms the insulator supporting units S are each bent up from channel iron or steel, which can be bought on the market in any size. Each supporting unit is preferably bent to U-shape with the fiat side of. the channel iron on the inside and the limbs thereof on the outside. The outer end 11 of each supporting unit has secured thereto a suitable insulator supporting attachment such as a spiral spring'12 forming the thread for receiving the glass insulator, the other end 13 of the supporting unit having a rivet hole 14 whereby theunit may be secured to a backpiece, this rivet hole being preferably in the line of strain of a wire pulling from the insulator.
Referring now to Figs. 1 and 2, the back piece or unit supporting member 15 is in the form of a comparatively wide plate or strip of sheet metal having a central longitudinal corrugation or ridge 16 raised therefrom, this corrugation or ridge being preferably of substantially U-cross section to fit between the channel limbs of the ends 13' of the insulator carrying units. Each back piece may carry any number of units, which are suitably spaced thereon, and the front face of the corrugation or'rib is provided with holes17 to register with the holes 14 in the insulator carrying units to receive rivets or bolts 18 whereby the insulator carrying units may be securely fastened to the back piece. The width of the corrugation or ridge 16 is substantially the same as the distance between the sides or legs 13' of the ends 13 of the insulator supporting units, sothat when the units are riveted or bolted to the corrugation these legs will intimately engage with the corrugation sides and will securely lock the units against lateral movement or displacement or against turning.
Adjacent each hole,'17 in the corrugation are the bolt holes 19 punched in the plate for accommodaitng bolts or lag screws for fastening the plate to a sup ort. Each set of openings 14- 19 are in t e plane of the stram' of wire pulling from thecor're-f sponding insulator, and the entire strain will therefore be taken up by the rivets 18 and by the bolts or screws passing through the holes 19. This is the most 'eflicient arrange- .ment, as, if the holes 19 were eitherabove or below the respective rivets 18, the pull of the wires would be transmitted first to the plate and then to the bolts which secure the plate to a support, this introducing a leverage action on the plate, which would tendto buckle. or bend it.- The plate with the" single corrugation can be rolled very readily rugations 20 and 21 extend longitudinallyand parallelly from the plate 22, and the 25 legs 13' of the ends 13 of the insulator carand cheaply.
In the form ofF i 3 and 4 we have substantially the same eatures as in the form of Figs. 1 and 2, with the exception that instead of one single corrugation, two cor 'rymg units engage between these corrugations instead of receivin the single corrugation; The positions o the rivet holes 14 distance between the corrugations 20 and 21 and bolt holes 19 with reference to the line of'strain are exactl the same as in the form ofFigs. 1 and 2.. n this modified form the is such thatthe ends 13 of the insulator sup porting units will be intimately received between the corrugations, so that when the insulator supporting umts'are riveted in back piece,
place they 'wil be rigidly locked against lateral or rotational displacement.-
ends 13 of the insulator supporting-units. At suitable intervals the front wall of the corrugation has openings 26 throu h which- In the modifications of Figs. 7 "and 8 I accomplish the same features as in the foregoing forms. However, instead of having a continuous wide back ieee I use a narrow back piece 27 preferab y in the form of In the modification illustrated in Figs. ;5 and 6 the back piece 23 has a single centrallongitudinal corrugation or-ridge 24, which forms a channel 25 along the rear of the and'the width of this channel is substantially equal to the'widthv of the.
"channel iron or steel. 7 To the flat face of 4 this channel iron back piece I apply the f ends 13 of the insulator supporting un ts, as
shown, and to secure the insulating units hole 14 in the insulator supporting unit andv the rivet hole 27 in the back piece. Thus, when a rivet is applied through the three rivet holes the strap, insulator sup ortin unit, and back iece are rigidly c amp and secured toget er, and the insulator supporting unit is locked against lateral or rotational displacement relative to the back piece. The wing or foot parts 28 of each strap have bolt holes 28 by means ofwhich the entire structure can be secured to a support, andithe bolt holes and rivet. hole of each strap are in the plane of strain of wires held by the corresponding insulator.
In 9 and 10 the arrangement is slightly iflerent from that shown in Figs. 7 and 8, in that the ends 13 of the insulator supportin same widt as the back piece,- are wider," so that the legs 13 will receive the back piece, and the deflected part of the strap is also wider'to receive the ends 13. vOtherwise, however, the arrangement and operation is exactly'the same as in the form of F-igsg7' and 8. I
' By means of my improved 'features of construction and arrangement brackets'are provided in which the insulator supporting units, instead of being of the units are suspended from the back member by a single rivet, and the engagement of the units with'the back member is such that lateral and rotational displacement are entirely prevented. The back member'is comparatively*- wide and 'ofi'ers a secure base and supportagainst side ull of wires. The va- I H rious rivets and bolt 'oles are inthe line of the strain and directly receive the strain so that no buckling, bending or twisting 'o the-supporting blade can result. The stock for the Vfll'lOllSJJlfiltS of the brackets can be very readily an proper lengths.
cheaply rolled and cut into I do not desire to be limited 'to the precise 3 forms and arrangements shown and descr1 bed,as other modifications are. possible which would still come within the scope of my mvent1on,-and I therefore desire to secure the following. claims ,by Letters Patent;
1. In an insulator'bracket, the combiner-- tion. of a comparatively wide.- back piece or base having a corrugated-section, and'an insulator supporting unit riveted to said back piece or base and engaging with said corrugated section to be locked against lateral or rotational displacement.
2. In an insulator bracket, the combination of a back piece or base provided with longitudinal corrugation walls, an insulator supporting unit, and a single rivet supportin said unit from said back piece or base, said unit being engaged by the corrugation walls to be locked thereby against lateral or rotational displacement with relation to the back piece or base.
3. In an insulator bracket, the combination of a comparatively wide sheet metal supporting strip deflected along a'longitudinal area to form side surfaces, an insulator supporting unit formed of. channel iron, and a single rivet connecting said unit with said supporting strip, sections of the limbs of the channel iron orming the unit engaging with said side surfaces on the supporting strip whereby said unit is locked against lateral or rotational displacement on said strip.
4. In an insulator bracket, a supporting strip stamped integral from sheet metal and ridged along a longitudinal area to form side surfaces, insulator sup orting units each in the form of a U-frame nt from a piece of channel iron, and a single rivet securing eachunit to the supporting strip, the flanges of the channel iron units engaging Wllill said side surfaces formed on the supporting strip whereby the units are locked against lateral displacement and rotational displacement about the rivets.
'5. In an insulator bracket, the combinaporting units formed of pieces of channel 1I.0I1 riveted to the back piece to intimately engage with the side surfaces thereof to be thereby locked against lateral or rotational displacement.
7. In an insulator bracket, the combination of'a back strip havin side surfaces, an
said bolt holes and rivet being in the line of strain of wires supported from said unit.
8. In an insulator bracket, the combination of a back strip having side surfaces, an
insulator supporting unit formed of a piece. of channel iron whose channel sides engage with the side surfaces of the back. strip, and means for securing said unit to said strip, the engagement of the channel sides of the unit with the. side surfaces-of the strip preventing lateral or rotational displacement ofthe unit with reference to the strip.
9. In an insulator bracket, the combination of a plate deflected at its middle to form a channel, an insulator supporting unit formed of a piece of channel iron and having one endinserted in said channel with ,its flange sides engaging against thechannel sides whereby the unit 1s locked against lateral and rotational displacement, and a rivet passing through said late and the unit to lock said unit within't e channel.
In witness whereof, I hereunto subscribe my name this 19th day of October, A. D.
' CHARLES L. PEIRCE,YJR. Witnesses: a I
CARE .SEYLER, A. B. RoBI'rzEK.