US1057216A

US1057216A - Transmission-tower.

Info

Publication number: US1057216A
Application number: US55548610A
Authority: US
Inventors: Frank M Bowman; Alexander H Bovard
Original assignee: RITER CONLEY Manufacturing CO
Current assignee: RITER-CONLEY MANUFACTURING Co; RITER CONLEY Manufacturing CO
Priority date: 1910-04-14
Filing date: 1910-04-14
Publication date: 1913-03-25
Anticipated expiration: 1930-03-25

Description

Ft MQBQWMAN & A. H. BOVARD'. TRANSMISSION TOWER.

- AAAAAAAAAAAAAAAAA PR. 111111 0. 1,057,216. Patented Mar. 25, 1913.

' 2 SSSSSSSSSSSS 1.

FIGJ. n62.

-WiTNESSES, HA INVENTORS, A \ra/4 F.. M. BOWMAN & A. H. BOVARD, TRANSMISSION TOWER.

APPLICATION FILED APR 1 1,057,216. 4'1910' Pa e e Mar-25, 1913.

2 SHEETS-*SHEET 2.

WITNESSES, 569W N T D sTAtrnsrArENr OFFICE.

FRANK M. BQWIVIAN, OF BELLEVUE, AND ALEXANDER H. BOVARD, OF PITTSBUBQ E, PENNSYLVANIA, ASSIGNORS ".IEO RITER-CONLEY MANUFACTURING COMPANY. 8F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

TRANSMISSION-TOWER.

To all whom it may concern:

Be it known that we, FRANK M. BowMAN and ALEXANDER H. BovARn, residents, re-

spectively, of Bellevueyand Pittsburgh, in

the county ofAllegheny and State of Penn sylvania, have invented certain new and useful Improvements 1n 'TlfiIlSHllSSlOIP' a specisigned to support electrical transmission wires or cables.

shown 'in' the accompanying drawings and as preferred, our tower eomprisesa tapersv ing pyramidal skeleton steel structure hav: ing four main upwardly converging corner; posts and a cross memberxdesigned for, car-g rying any desired voltage arranged in two;

phases and each; phase compris1ng; three conductor, W1res.-

An objec't'ofour inventionis to provide a tower of the character .mentioneyl -i n which" the four faces of the towerjare ofltriangular form and of substantiallyithe' same-di mensions and means for/supporting all of the wires thereon outside :oi rthiepcorner posts, thereby providing a tower combining v a maximum of strength withamininium of material. o i i v 1 v A further object of the. presentj'invention.

is" to provide v new; and. -improvd' -means ed 1 acting with the tower proper for supporting the wires of the respective phases.

A Still "further object v-of our invention is.

to provide a constructioninwhichlthe cross arm or cross-arms ofthefto'wer are subjected" to substantially no torsional. stresses and in which the load of the 11 per' wirev offeach' triangularly arranged p ass or circuit is not carried by the cross-arm or-cross-arms of the tower.

In the accompanying drawings, which illustrate an application of our invention, .Fi

re 1, is an elevational view of a tower em odying ourinvention; Fig. 2, a similar view taken at right angles to the view of Fig. 1; Fig. 3, a cross-sectional view taken on line III-III ofFig. 1; and Fig. 4,

an enlarged perspective view of the upper portion of the tower.

Specification of Letters Patent.

Application filed April 1.4, 1916.

Patented Mar. 25, 1913.

Eerial No. 555,486.

Referring to the; drawings and as preferred our tower comprises four corner- -posts 2, 7 preferably. formed of angle-bars whichfl arewsccured, at their lower endsftof legs 3f securely anchored in: the" 'ground by suitable anchor-plates 45, The lower ends of: the corner posts are spaced equidistant apart and. converge. upwardlystraightlines forming a. pyramldal structure having:

four triangular .faces of substantially the same dimensions. The four corner Jposts' of the: tower ,are connectedat suitably 'spaced -i1 1tervals- .by' horizontally disposed g I a bracing .membersf5, as arti'cularly shown In, the embodiment of ou invention as";

by; Fig;- 3. I In the towerillustrated we have shown three sets of; these;memberslindicated b theletters a,-'Ib, and "In: the horizontal p anes of the lower sett e we-employ diagonal' brace-bars 6 extending inwardly from." the';fourlposts and meetingfat'andsecured I seriesja' are preferably connected by; cross- 1 members 8, while in the intermediate or'. set

toa'plate 7 The brace bars 5 or, the-set or v b we dispense with said members 6- and -8 andemploy only the bracesr 5. In the 11 per series awe extend two of the bars '5" orga. ,Q

- distance outside of two of thecorner posts and utilize this combined. cross-arm' and bracing construction for the support, of telephone wires. The corner posts of thetower.

are further connected between thejadjacent 'sets 6 and c, a and b,' and between a andthe grou'nd. Thus, between the ground and the A lower braces ,5 viwe provide on each face angle-bars or webs 9 extending from the m embers 13 projecting upwardly and outwardlyfrom the plates 10;: and between the intermediate and upperbrace-ba'rs 5 we employ for connecting the posts, members14.'

The converging upper ends of the corner posts are connected by means of members 15 Qbarsh-the posts are connected byvmeans of andyld, and said members, 15 areconnected with a cross-arm 17. In the drawin s, we have'shown agsingle cross-arm pre erably of channel .form which extends through the tower and projects for a considerable dis tancefl'from two faces thereof. Crossarm 17 ends of the corner posts by means of the angle-bars'15 and the portions thereof lying outside of the tower are supported by a cantaliver construction in the form of a bracket composed of a combination of triangles. This cantaliver bracket construction constitutes an important and characteristic feature of our invention for it enables us to transmit the loads and stresses directly to the tower and relieves the cross-arm thereof.

The three wires of each circuit as illustrated are carried on pins 18 and these pins are arranged in the form of a. triangle, preferably an equilateral triangle, with all of the pins located outside of the four corner posts of'the tower. The two lower pins of each circuitare secured to the cross-arm'17, and the upper pin is carried by a mast preferably formed of two upwardly converging members19 mounted on and secured to outwardly extending members 20 constituting a part of the cantaliver bracket construction. Mem- .bers 19 are preferably of channel form and straddle the cross-arm 17 and are preferably tied together and to-the cross-arm by a member 21. In addition to the members 20 i which enter into the construction of one of diagonal members 25.

"the triangles of the cantaliver bracket, we provide

members

22 and 23 respectively arranged in connection with a brace-bar 5 of the upper set of horizontal braces and with a'member 24: to form two other triangularly shaped figures. We have indicated the trianets by means of the letters 6, f, and g, and

gles entering into the formation of the brackhave shown the largest triangle 0 braced by By this cantaliver 1 construction the loads and stresses-instead of 401 gjar carried by the triangular bracing and by said bracin being carried by the cross-arm or cross-arms transmitted to the tower proper. It wil be noted that'the load, in

the direction of the upper wire of each phase,

is carried by the two members 19 alternately in tension and compression, depending upon the direction of the load on-said wire, and

1 that the stresses are carried by these two members to the cantaliver bracket and thence to the tower. It will be further noted that the stresses produced by the lower transmission wires of each circuit will be directly transmitted to the tower proper by the said triangularly arranged members. 7

- In towers of this character it is usual to provide. means for carrying and supporting a. ground wire and for this purpose we have provided a superposed skeleton structure comprising four corner posts 26 secured to and extending upwardly from the corner posts of the tower proper. This u per structure corresponds to and is in eifiact 'a con tinuatio'n of the pyramidal main tower so that the structure as a whole comprises four triangular faces extending from the points of anchorage at the bottom to the ground wire connection at the top. The corner posts of the superposed structure or ground wire mast are suitably joined together at their convergin upper ends by any suitable means, sudh for example, as clamping means similar to the clamping means 27 of the members 19; and the corner posts 26 are braced by members 28.

What we claim is:

1. In a skeleton tower construction, the combination with a tower, of a cross-arm projecting therefrom, a mast, and a cantaliver bracket construction for supporting the cross-arm and mast comprising two pairs of members each secured to two corner posts of the tower in substantially the same horizontal plane and extending therefrom to the cross-arm.

2. In a skeleton tower construction, the combination with a tower, of a cross arm projecting therefrom, a mast comprising two converging members, and a cantaliver bracket construction for supporting the cross-arm and mast comprising two pairs of members each secured to two corner posts of the tower in substantially the same horizontal plane and extending therefrom to the cross-arm.

3. In a skeleton tower construction, the combination with a tower, of a cross-arm projecting therefrom, a mast comprising two converging members, and a cantaliver bracket construction for supporting the cross-arm and mast comprising two pairs of members each secured to two corner posts of the tower in substantially the same horizontal plane and extending therefrom to the cross-arm, said mast secured to one of the pairs of members and extending above the cross-arm.

, 4. In a skeleton tower construction, the combination, with a tower, of a cross-arm projecting therefrom, and a cantaliver bracket construction for supporting the cross-arm comprising a pair of members secured to two corner posts of the tower and extending therefrom to an end of the crossarm, a second pair of members secured to the said corner posts in substantially the same horizontal plane as the first mentioned pair of members and extending therefrom to the cross-arm at a point intermediate an end of the cross-arm and the tower.

5. In a skeleton tower construction, the combination with a tower, of a cross-arm projecting therefrom, a mast, and a cantaliver bracket construction for supporting the cross-arm and mast comprising a pair of members secured to two corner posts of the tower and extending therefrom to an end of the cross-arm, a second pair of members secured to the said corner posts in substantially the same horizontal plane as the first mentioned pair of members and extending therefrom to the cross-arm at a. point intermediate an end of the cross-arm and the'tower.

6. In a skeleton tower construction, the

combination with a tower, of a cross-arm projecting. therefrom, and a cantaliver bracket construction for supporting the cross-arm comprising a pair of members secured to two corner posts of the tower and extending therefrom to an end of the crossarm,.diagonal members connecting said pair of members, and a second pair of members secured to the said corner posts in substantially the same horizontal plane as the, first mentioned pair of members and extendingtherefrom to the cross-arm at a point intermediate an end of the cross-arm and the tower.

7. In a skeleton tower construction, the combination with a tower, of-a, cross-arm projecting therefrom, a most, and a cantaliver bracket construction for supporting the cross-arm and mast comprising a pair 01'" members secured to two corner posts of the tower and extending therefrom to an end of the cross-arm, diagonal members connecting said pair of members; and a second pair of members secured to the said corner posts insubstantielly the same horizontal plane as the first mentioned pair of members and extending therefromtothe.cross-arm at a point intermediate an end of the cross-arm 'and the tower, said mast secured to the first mentioned painof members of the bracket.

Intestimony whereof We aflix our signatures in presence of two witnesses? FRANK M. BOWMAN.

' ALEXANDER-II. BOVARD.

Witnessesw Y J. L. HAFNER,

A. C. WAY.