US1973556A - Supporting device for stranded transmission line conductors - Google Patents

Description

M. O. BOLSER Sept. 11, 1934..

SUPPORTING DEVICE FOR STRANDED TRANSMISSION LINE CONDUCTORS Filed Jan. 19, 1934 .MR 3E 6 L o PatentedSept. 11, 1934 I I 1,973,556

' UNITED STATES PATENTOFFICYE a 1,973,556 surron'rnvc n E v I c E Fon- STRANDED 'rnlmsmsslon LINE oonpuc'rons Miles 0. Bolser, Los Angeles, Calif. Application January 19, 1934;, Serial No. 707,366 6 Claims. (01. 248-31) This invention relates to a supporting device gripped on the cable by means of the screws 15. for stranded transmission line conductors. It This grip carries studs 16 which enter vertical is especially adapted to support large hollow core slots 17 formedin the thickened portions 8 of conductors of the segment type. Type RH 01' the shell. This arrangement fioatingly mounts '5 the General Corporation is an example. The the cable with respect to the shell while pre- 60 segments or strands of relatively heavy electrical venting endwise movement of the cable through conductors are twisted or spiralled 'about'the the shell. The cable may yield freely in all axis of the conductor so that the conductor can necessary ways while at the same time the studs be bent and follow the various necessary direc- 16 will prevent endwise movement of the cable tions without bringing undue stressesof either through the clamp if a cable should break.,

' compression or tension, upon the same. I am aware of the fact that known cable hang- Broadly speaking, the primary purpose of the ers or supports are constructed to support a cable present invention is to provide a supporting deat a plurality of points. However, it has been vice for cables of the character indicated, so found that wherethe cable is positively gripped l5 constructed that while the cable can not run at a plurality of points, highly objectionable therethrough if the cable should break yet the strains and stresses result. This is especially engagement of the saiddevice with the cable true where the points of gripping are less than is such as to permit freedom of movement of one lay of the cable apart. Calculations upon I r the cable with respect to the supporting device, a type HH cable to be used on the Boulder Can- 20 under the conditions of use and in such manner you transmission line and supported by a known 75 as to Prevent j ctionabl tresses w i h ve type of clamp positively gripping the cable show n inh t in t amps r supp rts h retothat when said cable is subjected toa vibration fore commonly employed. 4 angle at the supports'of 2, a stress of 27,000#

Further objects and advantages of the invenper square inch is induced in the top and bottom tion will be set forth in the detailed description segments of the cable. Measurements of these which follows. 1 segment stresses, by means of an extensometer,

n th mp nying drawing, have shown them to be detrimental to the life of Figure 1 is a plan view and Figure 2 is a side th abl in service, levati n f a amp nstru t d n a d n In the bending of a stranded cable or conduc- 30 with the invention. tor, the least stress is induced in the segments gure 3 is a t sve se ctional View upon when the bend involves uniformly one lay of the ne -3 of u e 2. conductor or a multiple number of lays.

ure 4 is a transverse central sectional View The individual -strands or segments of the conand ductor acting as rigid elements have stresses in- 35 Figure 5 n 6 r r ma Views hereduced in them as a result of bending, and under inafter described. any given bend these stresses are the least when Like numerals desi nat co sp n parts the bend is uniformly distributed over the greatin all the fi ur f the drs-wingest possible length of conductor. Th supporting vi of the Pr en invention Tests have. shown that when the two support- 40 comprises a e a ed shell 5 o eneral U-sha ing saddles 11' are ,4. lay from the center of the in cross section. This hell ma be supported n structure, or a distance of of the lay of cons d d manner, as for example. y m a ductor between saddles, the radius of curvature of the hanger 6 and trunnions said trunnions is almost exactly the theoretical radius'of curhe ng in thickened Portions 3 0f vature for a circle involving one lay of cable, and

4t shell. The material of the shell maybe thickened t gives almost perfect results, nt t p adjacent its opposite ends to provide the hubpoint of preventing t setting up of objectionlike portions 9 which constitute bearings for the able trai d stresses in the able. trunnions 10 of transverse saddles 11. The cable Th f re, whil I d not wish to limit myself is indicated at 12, and an inspection of Fi u to any particular distance between the saddles,.

56 3 will show that these saddles merely support and while the use 9f these saddles having free the cabl b are not mp or r pp d th engagement with the cable is to be covered broad- At the central portion of the suppo t a olyand irrespective of the distance between them, part grip is secured upon the cable; this grip yet, I wish, as a subsidiary feature to lay stress comprising an upper element 13 and a lower on the fact thatif these saddles be disposed as tenement 14; these elements being adapted to be described, i. e., a distance equal to V lay of conductor, highly advantageous results may be secured.

Further, I find it desirable to make the longitudinal radius of the supporting surface 0! the saddles equal to 2% times lay of conductor.

In Figure 5 I have illustrated the result of vibration out of phase upon opposite sides of the clamp or support this figure showing that under those conditions there is relative bending between the conductor and the clamp.

In Figure 6 I have diagrammatically illustrated that vibration in phase on opposite sides of the clamp induces no relative bending between conductor and clamp. I

Having described the invention, what I claim is:

1. A supporting d ixcle for conductors or. cables consisting of supporti g members pivoted to a shell or body'in which are pivoted, at either end, a supporting saddle that does not grip or clamp the conductor; a clamp or grip for the conductor located between the two saddles, free to float with the conductor in the vertical direction but restricted from moving in the longitudinal direction.

2. A supporting device for conductors or cables consisting of supporting members pivoted to a shell or body in which are pivoted, at either end, a supporting saddle that does not grip or clamp the conductor; a double cone type clamp or grip for the conductor located between the two saddles, free to float with the conductor in the vertical direction but restricted from moving in the longitudinal direction.

3. A supporting device for conductors or cables consisting of supporting members pivoted to a rigid shell or body in which are pivoted, at either end, a supporting saddle that does not grip or clamp the conductor; a clamp or grip tor the conductor located between the two saddles, tree to float with the conductor in the vertical direction but restricted from moving in the longitudinal direction; a curved non-angular rigid shell or body that encloses the saddles and clamp all except for a slot on the top and ends suflicient only for the assembly of the device on the conductor, thus reducing corona loss.

4. A supporting device for conductors or cables consisting 0L supporting members pivoted to a shell or body in which are pivoted, at either end and at one half segment or strand lay of the conductor apart, a supporting saddle that does not grip or clamp the conductor; a clamp or grip for the conductor located between the'two saddles, free to float with the conductor in the vertical direction but restricted from moving in the longitudinal direction.

5. A device of the character described comprising an elongated shell, a hanger supporting said shell at substantially its central point, a transverse saddle trunnion'ed in the shell adjacent each of its ends, said saddles being constructed to support but not to grip a cable, a gripadapted to be gripped upon the cable adjacent the central portion of the body, and studs carried by said grip and engaging vertically elongated openings in said shell. I

6. A structure as recited in claim 1 wherein the supporting surfaces of the said saddles are below the supporting surfaces of the tnmnions by which said saddles are carried.

- MILES O. BOISER.

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