US2804950A

US2804950A - Tv antenna mast

Info

Publication number: US2804950A
Application number: US514896A
Authority: US
Inventors: Jr James H Leslie
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-06-13
Filing date: 1955-06-13
Publication date: 1957-09-03
Anticipated expiration: 1974-09-03

Description

p 1957 J. H. LESLIE, JR 2,804,950

TV ANTENNA MAST 4 Sheets-Sheet 1 Filed June 13, 1955 FIG.

INVENTOR JAMEs -H. LESL TTORNEY'S J. H. LESLIE, JR

'rv ANTENNA MAST I Sept. 3, 1957 4 Sheets-Sheet 2 Filed June l3, 1955 INVENTOR JAMES H LESLlE,Jr.

ATTORNEY 5 Sept. 3, 195 J. H. LESLIE, JR 2,804,950

AAAAAAAAAAA ST Sept. 3, 1957 J. H. LESLIE, JR

TV ANTENNA MAST 4 Sheets-$heet 4 Filed June 13', 1955 FIG. l4

FIG.||

INVENT OR JAMES H. LESLIE, Jr.

BY M ATTORNEYS United Sttes atent TV ANTENNA MAST James H. Leslie, Jr., Hutchinson, Kans.

Application June 13, 1955, Serial No. 514,896

6 Claims. (Cl. 189-15) This invention relates to masts or towers for supporting television and radio antenna, and particularly towers of the tiltable or foldable type.

One object of the invention is to provide a tilting television tower which will be self supporting without the use of hazardous guy wires, and which may be easily installed and raised, and also readily lowered to a substantially horizontal position in case of high wind storms, by two men and without the use of a winch or special tools.

Another object of the invention is to provide a tower of this character ranging in height from thirty to sixty or more feet and having a base Width of about twentyfour inches and which is of triangular shape in cross section, the tower gradually tapering to the top, and the sections of the tower being formed of metal rods connected by welded cross bracing so that the tower has its greatest width and weight at the bottom and decreases in weight and wind resistance as it gains height.

Another object is to provide a sectional mast or tower of this character embodying a normally stationary lower section and an upper tiltable section composed of two or more separable units, and pivotally mounted between its ends on the top of the lower section so that the antenna may be readily raised or lowered, the lower section having its lower end hinged to a triangular base for folding downwardly from its normally upright position so that the tower may be raised by two men without equipment or lowered to the ground in an emergency such as a high wind storm.

Another object is to so construct the sections of the tower as to combine strength with lightness in weight and obtain a very rugged construction, the lower section of the tower being about twenty feet in length and composed of seven upright rods with at least seven angles of bracing.

Another object is to provide a triangular metal base to which the lower section of the tower is permanently hinged for folding and to which the triangular bottom of that section may be securely fastened by three bolts when the tower is in its upright usable position, means being provided for easily leveling the base to insure a true upright positioning of the tower.

With the above and other objects and advantages in view, the invention resides in the novel combinations and arrangements of parts and the novel features of construction hereinafter described and claimed, and illus-' trated in the accompanying drawings which show the present preferred embodiment of the invention.

In the drawings:

Fig. 1 is a perspective view of the tower in its upright position on a very reduced scale;

Figs. 2, 3 and 4 are further reduced diagrammatic perspectives to show the manner in which two men may install or erect the tower;

Fig. 5 is a perspective view of the upper two-part section of the tower, on a slightly enlarged scale, parts being brQken away; 7

Fig. 6 is a similar perspective view of the lower section of the tower;

Fig. 7 is a further enlarged detail view of the antenna supporting end of the upper section of the tower parts being broken away and in section;

Fig. 8 is an enlargedperspective view of the top portion of the lower sectionand the central portion of the two-part upper section of the tower;

Fig. 9 is a perspective view of the metal base and the lower hinged part of the lower section of the tower;

Fig. 10 is a detail vertical section showing one of the anchor bars set in concrete and a part of the base adjustably supported on it;

Fig. 11 is a perspective view of one of the anchor bars or rods;

Fig. 12 is a detail vertical section through a portion of the base showing one of the hinge elements of the tower and one of the bolt connections for fastening the latter to the base; 1

Fig. 13 is a detail view on an enlarged scale showing the clamping means for fastening to the lower section the tapered end of the upper section when the latter is in its upright position; and

Fig. 14 is a detail showing a modified form of anchor bar usable with low towers.

Referring more in detail to the drawings the numeral 15 denotes, as a whole, a metal base which is adjustably supported from and anchored to the ground; 16 denotes.

the lower section of the tower permanently hinged to the base for folding from its normally fixed upright position to a lowered substantially horizontal position on the ground; 17 denotes the upper tilting section of the tower pivoted between its ends on the top of the lower section; and 18 denotes an antenna carrying pole longitudinally adjustable at the free or upper end of the tiltable section so that the antenna may be supported at a height greater than the overall height of the tower. 1 have found that by constructing the tower as herein disclosed, two men without the aid of special tools or equipment may readily install and raise and lower a tower as tall as about sixty feet and one which does not require the use of guy wires to maintain it erect under ordinary weather conditions. The lower section 16 is preferably about 20' in length while the upper section is at least twice that long when a tower of about 40 is desired to support an antenna from 40 to 50 above the ground.

The upper section 17 is of triangular shape in crosssection through its length but is largest at its central or intermediate portion where it is pivoted to the'top of the lower section and tapers toward both its upper or antenna carrying end 19 and its lower manipulating end 20 which is adapted to be clamped against one side of the lower section 16 when the tower is in use as an antenna mast. The lower section 16 isalso of triangular shape in cross section at its lower end and tapers upwardly to a wedge shaped upper end which carries a pivot shaft 21 about the axis of which the upper section tilts. While the lower section has a triangular bottom it is composed of four longitudinal metal bars or

rods

22, 23, 24 and 25 which form leg members. The bars or

legs

24 and 25 have their lower ends brought together and welded to a bolt receiving collar or tube 26 to form one of three points or angles of the triangular base of the section 16, the lower ends of the

bars

22 and 23 having welded to them

similar collars

27 and 28 respectively to form the other to transversely extending and alined bearing collars 29. and 30 through which the pivot or hinge shaft 21 extends. The shaft may rotate in these sleeves or collars andbe.

retained therein by cotter pins as shown in Fig. 8. The bars 22 and 23' converge upwardly so that the side of the section which they form is of less width at its top but

thebearing collars

29 and 30 are spaced apartadistance slightly greater than the width of a side of'the triangular upper section at its greatest width. sides of the lower section 16. have angular. bracing formed by metal rods 32"bent back and forth into zig-zag shape and have their ends and their angles welded ,at 33 to the. opposed bars which form the sides of the section, as be readily understood conference to Figs. 8 and 9. For a 40 tower the angular bracing may be A" stock and the longitudinal bars Zi stock but the bars 229ml- 23 which formithe hinged side of the section 16 are preferablymade'heavier of /2" stock. The bars, and rods may be ofaluminum or other metal alloy but I find the use of steel satisfactory when it has a heavygalvanized coating.

. Themetal base 15 ispreferably of triangular shape and formed. by three

channel metal beams

35,36 and 37 arranged .as seen in Fig. 9 so that the triangular portion has outwardly extending arms 38 adapted to be anchored to the ground as seen in Fig. 10. The channel beams have their web portions disposed vertically, and at their inner ends the opposed flanges are cutaway and the adjacentweb portions are bent to form attaching flanges 39 disposed against the midporti-on of the web of an adjacent beam and fastened thereto by a bolt 40 or other fastening means. Welded on the

beams

35 and 36, as seen in Fig. 9, are alined

tubular bearings

42 and 43 for the ends' of a pivot shaft 44 which serves as a hinge about which the section 16 folds. The shaft 44 may be welded to the lower ends of the

bars

22 and 23 adjacent the

collars

27 and 28, and those collars and the third collar 26 are so disposed that when the section 16 is in its erect position the three collars will rest on the top flanges of the three beams and be in alinement with bolt holes 45 p in' those flanges for the reception of fastening bolts 46,

as will be understood upon reference to Fig. 12. The section16 will thus be securely fastened to the base 15 but when the three bolts 46 are removed the section may be folded down to the ground 'on'the hinge formed by the shaft 44 and its

bearings

42, 43.

.The base 15 is anchored to the ground in a manner which permits it to be leveled or adjusted at any time to dispose the tower in a perpendicular position. That is accomplishedby adjustably supporting the base on three upright anchor members in the form of metal rods or bars 48 having screw threaded upper ends adapted to pass freely through vertically alined holes 59 formed in the flanges of the channel beams at the outer ends of the arms 38. Nuts 51 on the threaded ends 49 engage the flanges of the beams and may be adjusted to raise or lower 'thearms 38. When the anchor bars or posts 48 are to be set in concrete, as seen in Fig. 10, a zig-zag rod 52 is welded at intervals to it so that it will be securely anchored in the concrete. For a small size tower the anchor bar or post 48 shown in Fig. 14 may be used and it may be screwed or turned into the ground so that concrete need not be used. The bar 48* has at its lower end an anger or screw portion 53 and is similar to the ordinary fence post hole auger. Near its threaded end 49 isa tool engaging projection 54 to facilitate screwing it into the ground.

The tiltable upper section 17 of the tower is preferably made in two approximately

equal length parts

19 and 20 which are detachably connected, as seen inFig. 8, for convenience in shipment. Each of these two parts or members 19 and 2G is composed of three longitudinal rods or bars in end to end alinement, the opposed bars on all three sides being connected by angularor diagonal brace rods similar to the bracing 32 in the lower section 16. Of the three

bars

55, 56 and 57 of the lower part 20, the

bars

55 and 56 are welded at '58 a short distance from their upper ends to the shaft '21, and on these ends bars converging to a single point and welded together.

That point is opposite the converging lower ends of the

bars

24 and 25 of the lower section 16 when the upper section is in its erect position. These opposed portions of the two sections may be readily clamped together to hold the upper section erect by using two

clamp plates

62 and 63 and a connecting bolt64, as shown in Fig. 13. This clamp is disposed slightly above the converging ends of the bars, the plate 63 being disposed beneath the bar 57 and across the bars and 56 and the plate 62 being disposed beneath the

bars

24 and 25.

While the three

bars

61, 62 and 63 of the part 19 con-' verge, their upper ends have inwardly bent portions 65 which are welded to a centrally positioned longitudinally extending sleeve or tube 66 adapted to receive the antenna pole 18, as seen in Fig. 7. In order to securely mount the post or pole a second similar sleeve 67 is supported in line with the sleeve 66 by three radially disposed rods 68 welded to the

bars

61, 62 and 63 within the section in spaced relation to the sleeve 66. The two sleeves are of a size to slidably receive a 1" or 1 /2" antenna pole which may be fixed in an adjusted position by a-set screw 69.

In erecting the tower, the base 15 is anchored to the ground and adjusted to a level position by means of the nuts'Sl. The, lower section 16 while in a horizontal position is then hinged to the base and the upper section 17 while substantially horizontal is hinged to the free end of the lower section. A suitable pull cordor line 70 is fastened to the lower end of the section 17. As I will be evident upon reference to Figs. 2, 3 and 4, two men may then elevate the two sections, and when the lower section is upright it is fastened to the base by the three bolts 46. By then pulling on the line 70, the upper section may be swung from the position shown in Fig; 4 to the erect position shown in Fig. 1, and fastened in that position by the

clamp plates

62 and 63 and the bolt 64. Any time that the antenna needs servicing the clamp may be removed and by means of the line 70 the heavier upper end 19 of the section 17 maybe lowered to the ground. In case of a severe wind storm, both sections may be readily lowered by two men to the ground, and as readily returned to the upright usable position. If desired double bracing by zig-zag rods 72 such as the rods 32 may be provided at the lower hinged portion of the section and also at the detachably connected ends of the two parts of the upper section 17, that is, on each side of the

hinge

21, 29, 30. This cross bracing will greatly strengthen these parts of the tower. By vertically adjusting the pole 18, the antenna may be raised or lowered with respect to the top of the section 17 up to about 10.

.From the foregoing, taken in connection with the accompanying drawing, it will be seen that novel and advantageous provision has been made for carrying out the objects of the invention, and while preferences have been disclosed, attention is invited to the possibility of making variations within the scope of the invention as claimed.

1' claim:

1. A tiltable antenna supporting tower structure which is self supporting without the use of guy wires and which maybe raised from or lowered to the ground by two men without the use of special tools, said tower structure comprising a flat metal base including three straight beams each having one end fastened at substantially the mid point of an adjacent beam to provide an inner triangular portion with anchoring arms extending outwardly from its angles, a lower tower section of upwardly tapered open work construction having a triangular lower end'of substantially the same area as the triangular portion of the base and a wedge-shaped upper end, said section comprising four metal bars forming legs connected by brace rods, two of said leg bars having their lower ends associated with two of the angles of the triangular portion of the base and having their converging upper ends spaced apart, the other two of said leg bars having their upper ends fixed to said spaced upper ends of said first two leg bars and being disposed in downwardly converging relation with their lower ends fixed to each other at the third angle of the triangular portion of the base, means hingedly connecting the lower ends of the first mentioned two leg bars to the base at the said associated angles, means for rigidly securing the lower ends of the lower section to the base when the former is in an upright position the last mentioned means including a detachable fastening means between the connected lower ends of said other two leg bars and the base at the said third angle, whereby the lower section may be fixed in an upright position or swing to a horizontal position on said hinge means, an upper tower section of open work construction and of triangular shape in cross section, said upper tower section being wide at its intermediate portion and tapering toward each end, means hingedly connecting one side of said intermediate portion of the upper section to the connected upper ends of the two first mentioned leg bars to dispose the said one side of the upper section against the two second mentioned leg members when the upper section is in an upright position, a flexible pull line attached to the lower end of the upper section, means at the upper end of the upper section to fasten an antenna pole thereto, and means to detachably fasten together said contacting portions of the two sections when the upper section is in an upright position.

2. The structure of claim 1 in which said last mentioned detachable fastening means comprises two apertured clamping plates, one extending across the lower portions of the two second mentioned leg bars and the other extending across portions of the lower end of the upper section, and a removable fastening element in the apertures of the two plates.

3. The structure of claim 1 in which the beams of said base are of channel shape and have their flanges disposed horizontally and provided with alined apertures near the outer ends of the said anchoring arms, upright anchor rods having means on their lower portions for anchoring them beneath the surface of the ground, their projecting upper ends being screw threaded and extending through said apertures in the flanges, and nuts on the threaded portions of said anchor rods and engaged with the outer faces of said flanges to permit vertical adjustment of the arms of the base on said anchor rods.

4. The structure of claim 1 in which the beams of said base are of channel shape and have their flanges disposed horizontally, in which said means hingedly connecting the lower ends of the two first mentioned leg bars comprises a shaft to serve as a pivot for the hinge and fastened to the lower ends of said two first mentioned leg bars with its ends projecting beyond those bars and alined tubular bearings for the projecting ends of the shaft fixed on top of the upper flanges of certain of said channel beams.

5. The structure of claim 4 in which said means for rigidly securing the lower end of the lower section to the base when the latter is in an upright position comprises three tubular elements fixed to the lower ends of the leg bars at the angles of the lower end of the lower section and adapted to rest on the upper flanges of the beams when the upper section is in an upright position and clamping bolts passed through said elements and through holes in said flanges, one of said elements and one of said bolts forming the said detachable fastening means between the connected lower ends of said other two leg bars and the base.

6. The structure of claim 1 in which said upper section References Cited in the file of this patent UNITED STATES PATENTS 456,193 Detlef July 21, 1891 870,053 Scholes Nov. 5, 1907 1,409,089 Fitch Mar. 7, 1922 2,280,220 Crosby Apr. 21, 1942 2,611,456 Bader Sept. 23, 1952