WO1982004502A1 - Assemblage de tour d'antenne et procede - Google Patents

Assemblage de tour d'antenne et procede Download PDF

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Publication number
WO1982004502A1
WO1982004502A1 PCT/US1982/000607 US8200607W WO8204502A1 WO 1982004502 A1 WO1982004502 A1 WO 1982004502A1 US 8200607 W US8200607 W US 8200607W WO 8204502 A1 WO8204502 A1 WO 8204502A1
Authority
WO
WIPO (PCT)
Prior art keywords
tower
antenna
ring
mounting portion
assembly
Prior art date
Application number
PCT/US1982/000607
Other languages
English (en)
Inventor
Gary L Ellingson
Leroy A Kapsner
Wendell E Miller
Original Assignee
Gary L Ellingson
Leroy A Kapsner
Wendell E Miller
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gary L Ellingson, Leroy A Kapsner, Wendell E Miller filed Critical Gary L Ellingson
Priority to AU85802/82A priority Critical patent/AU8580282A/en
Publication of WO1982004502A1 publication Critical patent/WO1982004502A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/18—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures movable or with movable sections, e.g. rotatable or telescopic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1242—Rigid masts specially adapted for supporting an aerial
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/02—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole

Definitions

  • the present invention relates generally to antenna tower assemblies, and more particularly to apparatus and methods for mounting and rotating a plurality of vertically-spaced antennas on a single antenna tower.
  • this face-mounted and rotatable antenna when this face-mounted and rotatable antenna is directed so that the antenna tower is directly behind the antenna, the antenna may be tuned for high performance.
  • the tuning of the antenna will be adversely affected.
  • the antenna is rotated farther, not only will the tuning of the antenna further deteriorate, but also, the direction-sensing ability of the antenna will be adversely affected. That is, if this rotatable antenna is used as a search antenna, false directional readings will be indicated. Then, as the antenna is rotated to face the antenna tower, its tuning will be degraded even more, making the antenna highly ineffective either for transmission or receiving of radio frequencies.
  • Kulikowski in U.S. Patent 2,623,999, shows an antenna that is mounted to a sleeve which is disposed coaxially around an antenna tower of the tubular mast type, and that is rotated by an electric drive motor. Kulikowski teaches a method of conductance coupling of the antenna to the lead-in conductors; but he does not address the technical problems of providing a workable rotating mount for face-mounting antennas to an antenna tower.
  • Kulikowski does not show, disclose, claim, or even intimate the need for, nor solutions for: vertically supporting the antenna, radially guiding the antenna, guiding against sideward tipping of the antenna-mounting ring, counterbalancing of torsional wind loads, use with towers of the trussed tower-leg type rather than the tubular mast type, electrical heating to overcome icing problems, or means for partially assembling the rotating device at ground level and then moving up past guy wires, all of which are advancements of the present invention.
  • an antenna tower assembly for the mounting and separately rotating of a plurality of vertically-disposed antennas on a single antenna tower.
  • a single, two-piece antenna- mounting ring is mounted coaxially around an antenna tower of the type having three vertically-disposed tower legs.
  • This antenna- mounting ring includes a V-shaped groove that is circumferentially disposed in an inner circumferential surface of the antenna-mounting ring.
  • Three support rollers having vertically-disposed roller shafts, cooperate with upper and lower surfaces of the V-shaped groove in the antenna-mounting ring to rotatably support the antenna-mounting ring.
  • Two of these support rollers are mounted to respective ones of two of the vertically-disposed tower legs by means of a support-roller assembly.
  • a third one of the support rollers is mounted to the third of the tower legs by means of a support and drive assembly that includes an electric motor and gear reduction unit.
  • the antenna-mounting ring includes a plurality of circnmferentially-spaced gear teeth; and the roller shaft of the third support roller includes a drive pinion which meshes with the circumferentially-spaced teeth in the antenna-mounting ring and which is driven by the gear reduction unit.
  • the roller shafts of the three support rollers are horizontally disposed; and the support rollers are frustoconical in shape.
  • the frustoconical support rollers engage a groove that is circumferentially disposed in the inner surface of the antenna-mounting ring.
  • the antenna-mounting ring is rotated by a drive pinion whose shaft is horizontally disposed below one of the roller shafts ana which engages circumferentially-spaced gear teeth on the antenna-mounting ring.
  • These circumferentially-spaced gear teeth are disposed separate from and below the circumferential groove in the antenna- mounting ring.
  • a tower-attaching ring circumscribes the three tower legs and is securely attached thereto.
  • An antenna-mounting ring is coaxial to and circumscribes the tower attaching ring.
  • the antenna-mounting ring is rotatably mounted to, and supported by, the tower-attaching ring by means of a plurality of support rollers which are rotatably mounted to the antenna- mounting ring and which engage a groove that is circumfere ⁇ tially disposed in the outer surface of the tower-attaching ring.
  • the support rollers are mounted for rotation about horizontal axes that are radially disposed with respect to a vertical axis of the antenna tower.
  • An electric drive motor and gear reduction unit are mounted to, and rotate with, the antenna-mounting ring.
  • This electric drive motor and gear reduction unit rotate a drive pinion which is mounted for rotation about an axis that is both horizontal and radially disposed with respect to a vertical tower axis.
  • the tower-attaching ring includes a plurality of circumferentially-spaced teeth which mesh with the teeth of the drive pinion.
  • a first arcuately-shaped mounting portion is secured to the three tower legs
  • a second arcuately-shaped mounting portion is secured to the three tower legs at a vertically-spaced distance from the first arcuately- shaped mounting portion
  • the mounting bracket for the antenna attaches to and slides circumferentially around the two arcuately- shaped mounting portions. Rotational positioning of the antenna of this fourth embodiment is by means of manually-turned screws.
  • FIG. 1 is a schematic top view of a variation of the preferred embodiment of FIGS. 2-6;
  • FIG. 2 is a side elevation, taken substantially as shown by view line 2-2 of FIG. 1, showing the construction of the preferred embodiment wherein the antenna is manually rotated and then locked at a desired rotational position;
  • FIG. 3 is a cross-sectional view, taken substantially as shown by section line 3-3 of FIG. 2, showing construction of the attaching bracket;
  • FIG. 4 is an enlarged detail drawing of the guide plate of FIGS. 2 and 5, taken as shown in FIG. 2;
  • FIG. 5 is a top plan view of the preferred embodiment of FIG. 2;
  • FIG. 6 is a partial side view, taken substantially as shown by view line 6-6 of FIG. 5;
  • FIG. 7 is a schematic drawing of a direction-indicating device for the embodiments of the succeeding figures.
  • FIG. 8 is a top plan view of a preferred embodiment in which the roller shafts for the support rollers are vertically disposed;
  • FIG. 9 is a cross-sectional view, taken substantially as shown by section line 9-9 of FIG. 8, showing in reduced scale, the counterweight and wind-vane assembly;
  • FIG. 10 is a partial side elevation, taken substantially as shown by view line 10-10 of FIG. 8, showing a support roller assembly
  • FIG. 11 is a cross-sectional view, taken substantially as shown by section line 11-11 of FIG. 8, showing the support and drive assembly
  • FIG. 12 is a cross-sectional view, taken substantially as shown by section line 12-12 of FIG. 8, showing a modification of the support roller assembly wherein the support roller is resiliently urged into contact with the antenna-mounting ring by a spring
  • FIG. 13 is an enlarged and partial view of a support roller, taken substantially as shown in FIG. 12, showing a resilient drive surface which may be used in place of the drive pinion of FIG. 11;
  • FIG. 14 is a cross-sectional view of an embodiment in which a support and drive assembly is secured to one of the tower legs, the support roller thereof rotates about a horizontally and radially disposed axis, and the electric drive motor is fixedly secured with respect to the antenna tower;
  • FIG. 15 is a cross-sectional view of a support roller assembly for the embodiment of FIG. 14;
  • FIG. 16 is an enlarged and cross-sectional view of the support roller and bearing assembly for the embodiment of FIGS. 14 and 15 and for the embodiment of FIGS. 17-20;
  • FIG. 17 is a cross-sectional view taken substantially as shown by section line 17-17 of FIG. 19, showing a support roller assembly for the embodiment of FIGS. 17-20 that utilizes two circumferential!y-cisposed rings;
  • FIG. 18 is a cross-sectional view, taken substantially as shown by section line 18-18 of FIG. 19, showing the support and drive assembly for the embodiment of FIGS. 17-20 that utilizes two circumferentially-disposed rings;
  • FIG. 19 is a top view of the embodiment that utilizes two circumferentially-disposed rings
  • FIG. 20 is a side elevation of the embodiment that utilizes two circumferentially-disposed rings, taken substantially as shown by view line 20-20 of FIG. 19;
  • FIG. 21 is a partial side elevation, taken substantially the same as FIG. 20, but showing only the tower-attaching ring and the screen grid that is optional for use as a reflecting device between the tower-attaching ring and the antenna tower;
  • FIG. 22 is a partial top view of an antenna tower assembly similar to that of FIG. 19, but illustrating a modification thereof for use with large Yagi antennas;
  • FIG. 23 is a partial side elevation showing the method of moving tower-attaching rings and antenna-mounting rings above guy wires;
  • FIG. 24 is a partial top view, taken substantially as shown by view line 24-24 of FIG. 23;
  • FIG. 25 is a partial side view, taken substantially as shown by view line 25-25 of FIG. 23;
  • FIG. 26 is a partial top view, taken substantially as shown by view line 26-26 of FIG. 23. Best Mode for Carrying Out the Invention Referring now to the drawings, and more particularly to FIG. 1, an antenna tower assembly 10 includes an antenna tower 12, an arcuately-shaped first mounting portion 14, a second mounting por tion 16, and an antenna 18.
  • the antenna tower 12 includes vertically-disposed tower legs, 20a, 20b, and 20c, which are interconnected by truss bracing 22.
  • the arcuately-shaped first mounting portion 14 is disposed radially outside the tower leg 20a and is disposed radially inside the tower legs 20b and 20c; so that a vertical axis 24 of the mounting portion 14 is disposed radially inside the antenna tower 12 but is disposed horizontally from a neutral axis 26 of the antenna tower 12.
  • the arcuately-shaped first mounting portion 14 is attached to the tower legs 20a, 20b, and 20c by respective ones of mounting brackets 28a-28c.
  • the antenna tower assembly 10 further includes wind-resisting members or wind vanes 30a and 30b which function to provide tor sional wind-balance means.
  • wind-resisting members or wind vanes 30a and 30b which function to provide tor sional wind-balance means.
  • a force vector 32 When wind impinges against the antenna 18 from any angle, a force is produced. This force is indicated by a force vector 32.
  • the force vector 32 causes a clockwise torque to be applied to the tower 12 that is the product of the force vector 32 and a m ⁇ nent arm 34 which is the orthogonal distance from the force vector 32 to the neutral axis 26 of the tower 12.
  • Wind impinging upon the wind-resisting member 30b produces a force as indicated by a force vector 35, producing a counterclockwise torque that is the product of the force vector 36 and a moment arm 38 which is the orthogonal distance from the force vector 36 to the neutral axis 26 of the tower 12.
  • a force vector 35 Wind impinging upon the wind-resisting member 30b produces a force as indicated by a force vector 35, producing a counterclockwise torque that is the product of the force vector 36 and a moment arm 38 which is the orthogonal distance from the force vector 36 to the neutral axis 26 of the tower 12.
  • the size of the wind- resisting member 30b can be selected, and/or the moment arm 38 can be changed, to provide effective torque balance for any size or type of antenna.
  • an antenna tower assembly 40 includes an antenna tower 12 having vertically-disposed tower legs 20a-20c and truss bracing 22, an arcuately-shaped first mounting portion 42a that is disposed radially outside the tower legs 20a- 20c and that is attached to the tower legs 20a-20c by respective ones of attaching brackets 44a-44c, an arcuately-shaped second mounting portion 42b that is similarly disposed with respect to the tower legs 20a-20c and that is similarly attached thereto, a third mounting portion 46 which includes an antenna mounting mounting bracket 48 and guide or cl ⁇ mp plates 50, and an antenna 18 that is operatively secured to the mounting bracket 48 by bolts 49, and adjusting bracket assemblies 52a and 52b.
  • Each of the attaching brackets such as the attaching bracket 44a of FIGS. 2 and 3, includes an inner portion 54 having a cylindrical surface 56 and an outer portion 58 having a cylindrical surface 60.
  • the cylindrical, surfaces 56 and 60 are sized to fit the tower leg 20a; and the portions 54 and 58 are secured to the tower leg 20a by bolts 62 and nuts 64 which are disposed in holes 66 and 68.
  • the outer portion 56 of the attaching bracket 44a includes elongated holes 70 which are positioned to cooperate with holes 72 in the mounting portions, 42a and 42b, and bolts 74 and nuts 76 are used to secure the mounting portions 42a and 42b to respective ones of the attaching brackets, 44a-44c.
  • the first and second mounting portions, 42a and 42b are rolled from channel iron; and so the first and second mounting portions, 42a and 42b, each include a web 78 and arcuately-shaped flanges 80a and 80b.
  • the arcuately-shaped flange 80a includes an arcuately-shaped outer surface 82a and an arcuately-shaped inner surface 82b.
  • the guide or clamp plates 50 each include a hole 84, a beveled surface 86 that conforms to the arcuately-shaped inner surfaces 82b cf the mounting portions 42a and 42b, a relieved surface 88, and a pivot lug 90.
  • Bolts 92 and nuts 94 are used to secure the guide or clamp plates 50 to the antenna mounting bracket 48.
  • the nuts 94 are loosened, allowing the bracket 48 and the guide or clamp plates 50 to slide with respect to the arcuately-shaped first and second mounting portions, 42a and 42b.
  • the nuts 94 are tightened after radially positioning the antenna 18, thereby locking the antenna 18 in a selected rotational position by forcing the beveled surface 86 of the guide or clamp plate 50 into contact with the arcuately-shaped inner surface 82b.
  • the adjusting bracket assembly 52a includes an adjusting bracket 96a having a threaded boss 98a, an adjusting screw 100a that is threaded through the boss 98a, a clamp plate 102 that is similar to the clamp plate 50, and bolts 104 and nuts 106.
  • the method of rotationally positioning the antenna 18 includes loosening the nuts 94, tightening the nuts 106, manually turning an adjusting screw, 100a or 100b, and tightening the nuts 94.
  • the an tenna 18 may be securely locked in a desired rotational position by forcing both the adjusting screws 100a and 100b against the antenna- mounting bracket 48.
  • each of the antenna tower assemblies that will be subsequently described includes a position indicator 120.
  • the position indicator 120 includes a regulated power supply 122 having output terminals 124a and 124b, a potentiometer 126 having legs 128a and 128b that are connected respectively to the output terminals 124a and 124b and having an arm 130, and an electrical meter 132 that is connected to the leg 128a and to the arm 130 of the potentiometer 126.
  • the potentiometer 126 schematically represents a ten-turn potentiometer, such as is common in the electronics industry.
  • an antenna tower assembly 140 comprises an antenna tower 12 having vertically-disposed tower legs, 20a-20c, and truss bracing 22.
  • the antenna tower assembly 140 further comprises an antenna-mounting ring 142 having an antenna-attaching lug 144, a counterbalance and wind vane attaching lug 146, a circumferential inner surface 148, a V-shaped circumferential groove 150 that includes an upper groove surface 152 and a lower groove surface 154, a relief groove 156, and a plurality of circumferentially-spaced gear teeth 158.
  • the antenna-mounting ring 142 is supportingly, guidingly, and rotatably attached to the antenna tower 12 by three support rollers such as a support roller 160 of FIGS. 8, 10, and 12.
  • the support roller 160 includes a wedge-shaped circumferential surface 162 having an upper circumferential support surface 164 that supportingly engages the upper groove surface 152, and having a lower circumferential guide surface 166 that cooperates with the lower groove surface 154 to prevent tilting of the antenna-mounting ring 142.
  • a support roller assembly 168 includes a support housing 170 having a bell-shaped shield 172, a mounting arm 174 having a cylindrical recess 176 therein, and threaded holes 180.
  • the support roller 160 includes a roller shaft 182 which is secured in the housing 170 by longitudinally-spaced ball bearings 184.
  • a support roller 186 includes roller shaft 188.
  • the support roller 186 also includes a roller body 190 which is preferably fabricated from steel, and a resilient cover 192 of molded rubber.
  • the support roller 186 includes a resilient upper or support surface 194 and a resilient lower or guide surface 196.
  • a support and drive assembly 202 includes a support housing 204 having a mounting arm 206 with a cylindrical recess 208 therein, having an adjusting lug 210, and having a shield portion 212.
  • the support and drive assembly 202 includes an electric drive motor and gear reducer unit 214 that is attached to a surface 216 of the housing 204 and that is attached to a roller shaft 218. The roller shaft 218 projects through the housing 204.
  • the support and drive assembly 202 also includes a support roller 219 which is identical to the support roller 160 of FIG. 12 except that the support roller 219 includes the roller shaft 218; and so the support roller 219 includes all of the surfaces as previously described for the support roller 160.
  • the support and drive assembly 202 also includes a toothed drive pinion 220 that is coaxially attached to the roller shaft 218 and that includes gear teeth 222. which progressively mesh with the gear teeth 158 of the antenna-mounting ring 142.
  • the support and drive assembly includes a ten-turn potentiometer 224 that is driven by the electric motor and gear re ducer unit 214.
  • the potentiometer 224 and the connection thereof to the electric drive motor and gear reducer unit 214 are conventional and do not comprise an inventive part of the present invention.
  • the support roller assembly 168 may be rotationally positioned about the tower leg 20a by loosening the bolts 200 and a bolt 226 that attaches an adjusting lug 228 of the housing 170 to a spider plate 230.
  • the spider plate 230 includes three legs 232, each of which includes an elongated adjusting hole 234.
  • the support and drive assembly 202 may be rotationally positioned about the tower leg 20c by loosening the bolts 200 and the bolt 226.
  • any one of the support rollers 160 or 219 is rotationally positioned about the respective one of the tower legs, 20a-20c, providing close proximity between all the guide surfaces 166 of the support rollers 160 or 219 and the lower groove surface 154 of the antenna-mounting ring 142, the gear teeth 222 of the drive pinion 220 engage the gear teeth 158 of the antenna-mounting ring 142 with proper backlash.
  • the spider plate 230 may be modified to provide one leg 236 that includes a spring tension device 238.
  • the spring tension device 238 includes a cylindrical rod 240, a collar 242 which is attached to the rod 240 by a transverse pin 244, and a spring 246.
  • the rod 240 is inserted through a hole 248 in a lug 250 and through a hole 252 in a lug 254, the lug 250 being welded to the leg 236 as shown and the lug 254 being integral with the leg 236.
  • the bolts 200 are left slightly loose or shims, not shown, are placed between the bracket 198 and the arm 174 so that the bolts 200 can be tightened without the cylindrical recess 176 being tightened against the tower leg 20a. Therefore, rather than the spider plate 230 being attached to the housing 170 by the lug 228, the rod 240 presses against the housing 170 and resiliently urges the housing 170 to rotate outwardly about the antenna tower leg 20a, thereby resiliently urging the support roller 160 thereof into resilient engagement with both the upper groove surface 152 and the lower groove surface 154 of the V-shaped groove 150.
  • the toothed drive pinion 220 and the circumferentially spaced gear teeth 158 are deleted and the support roller 186, with the resilient surfaces 194 and 196, is used to drive the antenna- mounting ring 142 by friction engagement of the resilient surfaces 194 and 196 with respective ones of the groove surfaces 152 and 154.
  • an antenna 256 that includes an attaching lug 258 is attached to the lug 144 of the antenna- mounting ring 142 by bolts 260.
  • a counterbalance and wind vane assembly 262 is attached to the lug 146 by bolts 264.
  • the counterbalance and wind vane assembly 262 includes a housing 266, a wind vane or wind-resisting member 268, and a counterbalance weight 270 that is retainably inserted into the housing 266.
  • the wind-resisting member 268 is sized and proportioned to provide a wind-resisting force and torque balance to natch and counteract the wind-resisting force and torque applied to the antenna tower 12 by the antenna 256 in the same manner as described in conjunction with FIG. 1; and the counterbalance weight 270 is sized to effectively counterbalance torque that is applied to the antenna-mounting ting 142 by the antenna 256.
  • the product of the weight of the counterbalance weight 270 times a distance 272 from a neutral axis 26 of antenna tower 12 to a centroid 274 of the weight 270 is adjusted to substantially equal the weight of the antenna 256 times the distance (not shown) from the neutral axis 26 of the antenna tower 12 to the centroid (not shown) of the weight of the antenna 256.
  • an antenna tower assembly 290 includes an antenna tower 12 having vertically-disposed tower legs 20a and 20b and a third vertically-disposed tower leg (not shown), an antenna-mounting ring 292 that is circumferentially disposed around the antenna tower 12, a support roller assembly 294 that is attached to the tower leg 20a, a support and drive assembly 296 that is attached to the tower leg 20b, and a second support roller assembly (not shown) that is identical to the support roller assembly 294 and that is attached to a third tower leg (not shown).
  • the antenna-mounting ring 292 includes a V-shaped groove 298 that is circumferentially disposed in a circumferential inner surface 300 of the antenna-mounting ring 292.
  • the groove 298 includes an upper or support surface 302 and a lower or guide surface 304.
  • a roller and bearing assembly 306 includes a support roller 308, a roller shaft 310, and a plurality of circumferentially-disposed steel balls 312.
  • the roller shaft 310 includes an enlarged portion 314 having a frustoconical surface 316 and a circumferential ball groove 318 that is disposed in the surface 316
  • the support roller 308 includes a frustoconical outer surface 320, a bore 322 having a frustoconical inner surface 324, and a circumferentially-disposed ball groove 326 in the inner surface 324.
  • the balls 312 are circumferentially disposed in the grooves 318 and 326, thereby providing an integral ball bearing between the support roller 308 and the roller shaft 310.
  • the roller shaft 310 is attached to a support housing 328 of the support and drive assembly 296 by inserting the roller shaft 310 into a bore 330 of the housing 328.
  • the support roller assembly 294 includes a roller and bearing assembly 332 that is identical with the roller and bearing assembly 306 except that the roller and bearing assembly 332 includes a longer roller shaft 334 and an integral adjusting screw 336 with a threaded portion 338.
  • the roller shaft 334 is slidably and rotatably received into a bore 340 of a support housing 342 of the support roller assembly 294; and the threaded portion 338 is threadingly received into a threaded bore 344 of the housing 342.
  • rotation of the adjusting screw 336 is effective to radially adjust the support roller 308; and radial adjustment of the support roller 308 is effective to control a clearance 346 between the support roller 308 and the lower or guide surface 304 of the antenna-mounting ring 292.
  • the housing 342 of the support roller assembly 294 includes an upper housing portion 348 and a lower housing portion 350 which are interconnected by any suitable means.
  • the support roller assembly 294 is attached to the tower leg 20a of the antenna tower 12 by brackets 352 and bolts 354.
  • the housing 328 of the support and drive assembly 296 includes an upper housing portion 356 and a lower housing portion 358 that are interconnected by any suitable means.
  • An electric drive motor 360 having an output shaft 362 is mounted in the lower housing portion 358.
  • a gear reducer unit 364 is mounted in the lower housing portion 358, is attached to the output shaft 362 of the electric drive motor 360 and includes an output shaft 366.
  • a ten-turn potentiometer 368 is mounted in the lower housing portion 358 and is connected to and driven by the gear reducer unit 364.
  • the antenna-mounting ring 292 includes a plurality of circumferentially-spaced gear teeth 370; and the support and drive assembly 296 includes a bevel gear or toothed drive pinion 372 being coaxially mounted onto the output shaft 366 and having gear teeth 374 that progressively mesh with the gear teeth 370 as the drive pinion 372 is rotated by the electric drive motor 360 and rotates the antenna-mounting ring 292.
  • the support and drive assembly 296 is attached to the tower leg 20b by brackets 352 and bolts 354.
  • an electrical resistance heating unit 376 which includes an electrical resistance unit 378 and a molded body 380 of dielectric material is circumferentially disposed around the antenna-mounting ring 292 and is attached thereto by screws 382.
  • the antenna tower assembly 290 further includes an antenna 384 that is attached to the antenna-mounting ring 292 by a housing 386.
  • a counterbalance weight such as the counterbalance weight 270 of FIG. 9 and a wind-resisting member such as the wind vane 268 of FIG. 9 are at tached to the antenna-mounting ring 292 at a point circumferentially spaced, from the housing 386.
  • the counterbalance and wind vane assembly 262 of FIGS. 14 and 15 may be attached to the antenna-mounting ring 292 in the same manner as is shown for attaching the counterbalance and wind vane assembly 262 to the antenna-mounting ring 142 of FIGS. 8 and 9, or by the use of an additional housing identical to the housing 386.
  • the detailed construction of the counterbalance and wind vane does not form an inventive part of the present invention.
  • FIGS. 14 and 15 differs from the embodiment of FIGS. 8-13 in that the roller shafts 310 and 334 of FIGS. 14 and 15 are horizontally disposed whereas the roller shafts 182 and 218 of FIGS. 10 and 11 are vertically disposed.
  • the embodiment of FIGS. 14 and 15 also varies from the embodiment of FIGS. 8-13 in that the clearance 346 between the support rollers 308 and the lower surface 304 of the V-shaped groove 302 is by means of the adjusting screw 336 whereas clearance between the rollers 166 and 219 and the lower surface 154 of the groove 150 of the embodiment of FIGS.
  • FIGS. 8-13 is by means of rotationally positioning the support roller assembly 168 or the support and drive assembly 202 about one of the tower legs, 20a or 20c. Similarities between the embodiment of FIGS. 14 and 15 and the embodiment of FIGS. 8-13 include the mounting of three support rollers to respective ones of three antenna tower legs and both supporting and guiding an antenna-mounting ring by engagement of support and guide surfaces of support rollers with support and guide surfaces of a groove that is circumferentially disposed in the antenna-mounting ring.
  • an antenna tower assembly 400 includes an antenna tower 12 having a plurality of vertically disposed tower legs 20a-20c, a tower-attaching ring 402 being attached to the antenna tower 12 by brackets 404, an antenna-mounting ring 406 being circumferentially disposed about the tower-attaching ring 402, a support and drive assembly 408 being attached to the antenna-mounting ring 406 by bolts 410, an antenna 412, a support and counterbalance assembly 414 being attached to the antenna- mounting ring 406, a wind vane 416 being attached to the support and counterbalance assembly 414 and support roller assemblies 306 that are attached to the antenna-mounting ring 406 by means which will be subsequently described.
  • the support and drive assembly 408 includes a housing 418 having an upper housing portion 420 and a lower housing portion 422, a support roller assembly 306 which was previously discussed, in conjunction with FIG. 16, and whose shaft, 310, is horizontally disposed in a bore 424 in the upper housing portion 420, an electric drive motor 360 having an output shaft
  • gear reducer unit 364 being driven by the output shaft 362 of the electric drive motor 360 and having an output shaft 366, a potentiometer 368 that is attached to the gear reducer unit 364 by a shaft 426, and a bevel gear or drive pinion 372 which includes circumferentially-spaced gear teeth 374 and which is attached to the output shaft 366.
  • the tower-attaching ring 402 includes a circumferential outer surface 428 and a circumferentially disposed V-groove 430 in the circumferential outer surface 428.
  • the groove 430 includes a lower or support surface 432 and an upper or guide surface 434.
  • the support roller 308 supportingly engages the support surface 434 of the tower-attaching ring 402.
  • the tower-attaching ring 402 also includes a plurality of circumferentially-spaced gear teeth 436.
  • the gear teeth 374 of the drive pinion 372 selectively engage the gear teeth 436 as the electric drive motor 360 rotates the output shaft 366 through the gear reducer unit 364.
  • the antenna 412 is attached to the support and drive assembly 408 by clamping the antenna 412 between the housing portions 420 and 422 of the housing 418.
  • the support and counterbalance assembly 414 includes a housing 418 having an upper housing portion 420 and a lower housing portion 422, a support roller assembly 306 which is retainingly inserted into a bore 424 of the top housing portion, and a counterbalance weight 438 which has been placed in a cavity 440 of the housing 418,
  • the wind vane 416 is attached to the assembly 414 by clamping the wind vane 416 between the housing portions 420 and 422 of the housing 418,
  • An electrical resistance heating unit 442 includes an electri cal resistance unit 444 that is molded in a dielectric body 446 and that is attached to the tower-attaching ring 402 by screws 448.
  • the tower-attaching ring 402 is attached to the antenna tower 12 by the brackets 404; and the antenna-mounting ring 406 is attached to the tower-attaching ring 402 by four roller and bearing assemblies 306,
  • One roller and bearing assembly 306 is a part of the support and drive assembly 408, a second one of the roller and bearing assemblies 306 is a part of the support and counterbalance assembly 414, and the other two of the roller and bearing assemblies 306 are a part of support roller as semblies 450a and 450b.
  • the support roller assemblies 450a and 450b are constructed the same as the support and counterbalance assembly 414 of FIG. 17 except that the counterbalance weight 438 is deleted, the wind vane 416 is deleted, and housings 452 of the assemblies 450a and 450b are shortened, as shown in FIG. 19, from the housing 418 of FIG, 17,
  • the embodiment of FIGS. 17-20 varies from the embodiment of FIGS. 14 and 15 in that the embodiment of FIGS. 17-20 includes two rings, 402 and 406, that are coaxially disposed, the tower-attaching ring 402 being attached to the antenna tower 12, and the antenna-mounting ring 406 being supportably and rotatably attached to the tower-attaching ring 402 by the roller and bearing assemblies 306.
  • FIGS. 17-20 also differs from the embodiment of FIGS. 14 and 15 in that the electric drive motor 360 of FIGS. 17-20 rotates about the antenna tower 12; whereas the electric drive motor 360 of FIGS- 14 and 15 is stationary with respect to the antenna tower 12.
  • a cylindrically-shaped grid or reflecting device 454 is radially interposed between the antenna tower 12 and the tower-attaching ring 402, and is electrically bonded to the antenna tower 12.
  • the purpose of the reflecting device 454 is to provide a reflecting surface that is uniform in size and is constant in distance from the antenna 412 to the antenna tower 12. As shown in FIG. 19, an element 455 of the antenna 412 remains at a constant distance from the reflecting device as the antenna 412 is rotated.
  • both the area of the reflecting surface, and the distance to the reflecting surface frcm the antenna 412 to the metal of the antenna tower 12 will vary slightly, depending upon the rotational position of the antenna tower 12 with respect to various ones of the tower legs, 20a-20c, and the strut bracing 22.
  • the tower-attaching ring 402 includes arcuate segments 455a and 456b.
  • the arcuate segments 456a and 456b are identical and each includes a lapped-joint end 458a and 458b.
  • an antenna tower assembly 470 includes an antenna tower 12 having vertically-disposed tower legs 20a-20c, and a tower-attaching ring 402 that is attached to respective ones of the antenna tower legs 20a-20c by brackets 404.
  • An antenna- mounting ring 472 is supportingly and rotatably attached to the tower-attaching ring 402 by antenna-attaching and support roller assemblies 474a and 474b, the support and drive assembly 408 of FIG. 18, two support and counterbalance assemblies 414 of FIG. 17, and a support roller assembly 450a.
  • the support roller assembly 450a was described in conjunction with FIG. 19.
  • the antenna-attaching and support roller assemblies 474a: and 474b each include one of the roller and bearing assemblies 306 and each is constructed substantially the same as the assembly 414 of FIG. 17.
  • the embodiment of FIG, 22 varies from the embodiment of FIG. 17-20 only in that a Yagi antenna 476 is mounted to both of the assemblies 474a and 474b rather than being mounted to a single assembly, such as the assembly 408 of FIG. 18.
  • a total of six assemblies, each having a roller, and bearing assembly 306, are used to give greater support for large antennas, such as the Yagi antenna 476.
  • Two support and counterbalance assemblies 414 are used to compensate for the extra size and weight of the Yagi antenna 476 over smaller antenna assemblies; and a wind vane 416 is attached to each of the assemblies 414 to compensate for the large size of the Yagi antenna 476.
  • the method of assembly includes placing arcuate segments 456a and 456b around an antenna tower 12 that has vertically-disposed tower legs 20a-20c, connecting an end 482a of the segment 456a to an end 432b of the segment 456b to provide a tower-reta ⁇ ning or tower-retained ring 484 having unconnected lapped-joint ends 458a and 458b, moving the ring 484 up to guy wires 488, lifting the end 458a of the ring 484 above the end 458b of the ring 484 and above one of the guy wires 488 by rotating the segment 456a about a junction 490 between the interconnected ends 482a and 482b, rotating the end 458a around the antenna tower 12, lifting the tower-retaining ring 484 to a desired height position as shown in
  • FIG. 21 connecting the end 458a to the end 458b to make a complete ring 402 as shown in FIG. 21, and attaching the ring 402 to the antenna tower 12.
  • the ends 458a, 458b, 482a, and 482b are of the lapped end construction as shown and each includes two bolt holes 494.
  • Two pieces of woven steel cable 496 and four cable clamps 498 are used to interconnect the ends 482a and 482b as shown in FIGS. 23 and 26, the cable clamps 498 being positioned on respective ones of the cables 496 to allow the end 458a to be lifted above the end 458b,
  • the use of the cables 496 through two of the holes 494 in the ends 482a and 482b is effective to prevent the ends 458a and 458b from being spaced-apart far enough for the ring 484 to be separated radially from the antenna tower 12. Therefore, the ring 484 is made to be tower-retaining by interconnecting the ends 482a and 482b.
  • a tower-attaching ring, an antenna- mounting ring, or any other ring or arcuate segment may be built or assembled as a tower-retaining ring, and may be raised above the guy wires by rotating one unconnected end above the guy wires.
  • a tower-retaining ring also provides greater safety to the tower crew; because a tower-retaining ring, with any other equipment assembled thereto, may be pre-assembled at ground level and may be raised as a unit, being guidingly retained to the tower as the assembly is raised, as opposed to separately carrying many individual parts up the face of the tower and assembling them at the antenna-mounting height.
  • the method of rotatably mounting an antenna 256 to an antenna tower 12 having three vertically disposed tower legs, 20a-20c comprises attaching one of the support housings 170 to each of two of the tower legs, 20a and 20b, attaching the support housing 204 to the tower leg 20c, placing the antenna-mounting ring 142 around the tower 12, rotatably connecting the ring 142 to the support housing 170 and to the support housing 204 by attaching the support rollers 160 and 219 to the housings 170 and 204, and attaching an antenna 256 to the ring 142.
  • the method further includes electrically heating the antenna-mounting ring or second mounting portion 292 by the use of an electrical resistance heating unit 376, or electrically heating the tower-attaching ring or first mounting portion 402 by the use of an electrical resistance heat ing unit 442, and then rotationally positioning the antenna, 384 or 412, by use of the electric drive motor 360.
  • the first mounting portion includes two of the support housings 170 and the support housing 204; and the antenna-mounting ring 292 is the second mounting por tion.
  • the first mounting portion includes two of the support housings 342 and the support housing 328.
  • the antenna-attaching ring 402 is the first mounting portion; and the second mounting portion includes the antenna-mounting ring 406 or the antenna-mounting ring 472.
  • the first and second mounting portions are interconnected by attaching a support roller 166 to each of the support housings 170 and by attaching a support roller 219 to the support housing 204.
  • the support rollers 306 are frustoconical in shape and include a large diameter end 460 that is adjacent to the roller shaft 310, and a small diameter end 462.
  • the drive pinion 372 includes a large diameter end 464 that is adjacent to the shaft 366, and a small diameter end 466.
  • the present invention provides means for rotatably mounting one or more search devices to the face of a tower.
  • the search devices which may be mounted include radio antennas, video cameras, and searchlights.
  • the present invention includes an embodiment wherein two vertically-spaced and arcuately-shaped rings are mounted to the three tower legs of the tower and the search device is supportingly guided on the arcuately-shaped rings.
  • the present invention includes two embodiments wherein a search-device mounting ring is rotatably attached to the three tower legs of the tower by a roller that is operatively attached to each tower leg and that engages a groove in the search-device mounting ring.
  • the roller shafts are vertically disposed and are both radially and circumferentially disposed about a vertical axis.
  • This vertical axis is preferably the neutral axis of the tower, but it may be any vertical axis that is disposed radially inside the tower legs and. truss bracing of the tower.
  • roller shafts are disposed both orthogonally and radially with respect to a vertical axis.
  • the present invention includes a fourth embodiment wherein two rings are used. One ring is attached to the tower and the other ring is rotatably attached to the first ring by use of a plurality of rollers.
  • the present invention includes: roller and groove means for supporting, guiding, and stabilizing the search-device mounting ring, counterbalance means for counterbalancing the weight of a search device, torsional wind balance means for counteracting torsional wind loads that are applied to the tower by the search device, manual or electrical means for rotating the search device, means for locking the search device in a desired position, means for electrically heating and thus thawing ice frcm whichever ring includes gear teeth, a reflecting device that prevents an antenna from seeing a varying area of metal in the antenna tower as the antenna is rotated, and a method for raising partially-assembled rings above guy wires.
  • the present invention provides apparatus and method for mounting a plurality of antennas, or search, devices, to a single tower, and for separately rotating, rotationally positioning, the antennas or search deyices, Therefore, the present invention provides functional advantages over prior art systems wherein only one antenna can be rotated, and economic advantages over prior art systems wherein multiple towers are required,
  • the present invention allows the use of larger antennas on a given size of tower, the use of a larger number of antennas on a given size of tower, or the use of a tower of smaller cross-sectional dimensions and less torsional rigidity for a given number of antennas of a given size; because all of the embodiments of the present invention apply torsional loads equally to all of the tower legs, and because of the torsional wind balance that is provided by the use of wind vanes.
  • the present invention provides apparatus and methods for the rotatable mounting and both separate and selective rotational positioning of a plurality of antennas or search devices on a single tower.
  • the present invention may be used by homeowners for mounting and rotating of antennas cf the types used for receiving video signals, for broadcasting and receiving of citizens band radio signals, and for receiving both AM and FM radio signals.
  • the present invention may be used by radio amateurs for both broadcasting and receiving antennas, by commercial radio stations, by microwave transmission companies, and by the military forces for radio communications.
  • the present invention may be used to mount and separately rotate such, search devices as directional receiving antennas, video cameras, and searchlights in such numbers or combinations as are needed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Support Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Wind Motors (AREA)

Abstract

Dispositif et procede de montage et de positionnement rotatif tant separe que selectif d'une pluralite d'antennes separees, ou de dispositifs de recherche, sur une seule tour. Trois modes de realisation preferentiels destines au montage et au positionnement rotatif d'antennes ou de dispositifs de recherche comprennent un anneau de montage d'antenne, ou un anneau de montage de dispositifs de recherche (142, 292, ou 406), cet anneau etant fixe a la tour (12) par une pluralite de rouleaux de support (160, 219, ou 306). Les rouleaux de support sont fixes de maniere operationnelle a la tour ou a l'anneau de montage d'antenne et engagent de maniere a la soutenir une rainure de circonference (150, 298 ou 430) qui est situee soit dans l'anneau de montage d'antenne soit dans un anneau se fixant a la tour (402) qui est place entre l'anneau de montage d'antenne et la tour. Le mode de realisation preferentiel pour le montage d'antenne du type a positionnement rotatif et qui sont ensuite laisses en permanence dans cette position rotative utilise deux parties de montage espacees verticalement et en forme d'arcs (42a et 42b).
PCT/US1982/000607 1981-06-10 1982-05-07 Assemblage de tour d'antenne et procede WO1982004502A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU85802/82A AU8580282A (en) 1981-06-10 1982-05-07 Antenna tower assembly and method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US272313810610 1981-06-10
US06/272,313 US4468671A (en) 1981-06-10 1981-06-10 Antenna tower assembly and method of attaching antennas

Publications (1)

Publication Number Publication Date
WO1982004502A1 true WO1982004502A1 (fr) 1982-12-23

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PCT/US1982/000607 WO1982004502A1 (fr) 1981-06-10 1982-05-07 Assemblage de tour d'antenne et procede

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US (1) US4468671A (fr)
EP (1) EP0081540A4 (fr)
JP (1) JPS58500923A (fr)
WO (1) WO1982004502A1 (fr)

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US5467955A (en) * 1994-07-28 1995-11-21 Bellsouth Corporation Antenna mounting platform for a monopole tower
US5570546A (en) * 1995-07-31 1996-11-05 American High Mast Systems, Inc. System for raising and lowering communications equipment
US5861858A (en) * 1997-06-30 1999-01-19 Harris Corporation Antenna feed and support system
GB2337538B (en) * 1998-05-21 2002-08-14 Richard Paul Wilkinson Multi-functional mast
US6222504B1 (en) * 2000-01-14 2001-04-24 Omnipoint Corporation Adjustable antenna mount with rotatable antenna brackets for PCS and other antennas
GB0030931D0 (en) * 2000-12-19 2001-01-31 Radiant Networks Plc Support structure for antennas, transceiver apparatus and rotary coupling
US6685383B2 (en) 2001-11-02 2004-02-03 Radio Frequency Systems Inc. Antenna and radio interface
US20040123553A1 (en) * 2002-12-18 2004-07-01 Vertical Solutions, Inc. Method of reinforcing a tower
US7086207B2 (en) * 2005-06-09 2006-08-08 Andrew Corporation Antenna sector frame
US8896497B1 (en) * 2012-03-05 2014-11-25 Sprint Communications Company L.P. Communications-tower antenna mount
JP6163403B2 (ja) * 2013-09-30 2017-07-12 Ｎｅｃネッツエスアイ株式会社 アンテナ移動装置及びアンテナ移動方法
EA027825B1 (ru) * 2015-03-10 2017-09-29 Открытое Акционерное Общество "Минский Завод Колёсных Тягачей" Система развёртывания антенно-мачтовой конструкции

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US3008140A (en) * 1953-06-10 1961-11-07 Joseph K Rose Means for independent orientation of antennas on a mast
GB808961A (en) * 1956-06-22 1959-02-11 Gen Electric Co Ltd Improvements in or relating to aerial assemblies
US3246431A (en) * 1962-10-17 1966-04-19 Faerber Leopold Building with rotatable observation structure
US3541570A (en) * 1968-07-26 1970-11-17 Computer Equipment Corp Circularly polarized antenna
US3790950A (en) * 1971-09-13 1974-02-05 Scientific Atlanta Antenna array for minimizing co-channel interference

Also Published As

Publication number Publication date
EP0081540A1 (fr) 1983-06-22
JPS58500923A (ja) 1983-06-02
EP0081540A4 (fr) 1983-10-04
US4468671A (en) 1984-08-28

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