US 2495972 A
Description (OCR text may contain errors)
Jan. m, 19%
E. o. JOHNSON 2,495,!) 72 ART OF MOUNTING TEL EVlSION RECEIVING ANTENNAS Filed July 51, 1946 A TTOR/VEY fiatented Jan. 31 1950 ifij il i;
1 ART oEMoUNrINGTELEvIsIoN RECEIVING ANTENNAS Ernest 0. Johnson, Haddonfield, N. J., assignor to Radio Corporation of America, a corporation of Delaware Application July 31, 1946, Serial No. 687,477
, This invention relates masts, and will be described as applied to the mounting of an antenna mast'for a home television receiver upon the exterior wall of a house having an overhanging roof.
The usual television receiving antenna comprises a dipole which, for optimum performance, should be oriented in a; horizontal plane. When the Vertical mast upon which the dipole is mounted is to be supported upon the outer wall or upon a window frame of a house having an overhanging roof considerable difficulties may be encountered in the vertical alignment of the mast. As a result, television-set manufacturers have heretofore left antenna installation problems to the ingenuity of the purchaser and this has led, in some cases, not only to faulty reception but to fire hazards as well.
Accordingly, the principal object of the present invention is to obviate the foregoing and other less apparent objections to present day receivingantenna installations and to provide an improved installation which though made of parts of standard dimensions shall be capable of being applied to buildings having various roof and Window sill dimensions.
The invention will be described in connection with the accompanying drawing, wherein:
Figure 1 is a view in perspective of a television receiving antenna mounted in accordance with to the art of mounting 1 Claim. (Cl. 25033.51)
the principle of the invention upon the exterior 3 wall of a house, and
Figure 2 is an enlarged view in perspective of one of the mounting brackets for the antenna mast shown in Figure 1.
In the drawing, l designates, generally, a house having an exterior side wall 2, an overhanging roof 3, and a window frame 4 which includes an upright frame portion 5 and a sill portion 6 which project different distances from the plane of the exterior wall 2 beneath the overhanging portion 3a of the roof. Two mounting brackets 1 and 8, later described, are mounted one above the other upon the upright portion 5 and the sill portion 6 of the window frame and are long enough to extend well beyond the overhanging portion 3a of the roof. The distance between upper and lower brackets 7 and 8 should not be less than onequarter the length of the antenna mast 9 above the upper bracket 7 and the height of the antenna 10 on the upper end of the mast should not be greater than ten feet above the upper bracket 1.
In the instant case, since the lower bracket 8 is mounted on the sill portion 6 of the window frame, it projects farther from the plane of the wall 2 than the upper bracket 1 which is mounted on the upright portion 5 of the said frame. This virtual inequality in the length of the brackets I and 8 would ordinarily dictate the use of shims or the use of brackets of various lengths, but is compensated for, in accordance with the present invention, by the use of duplicate brackets of the special construction shown in Fig. 2.
The brackets I and 8 each comprise a triangular metal frame and an auxiliary brace in the form of a rod or bar ll. As shown in Fig. 2 the frame comprises a right angled triangle formed of a unitary right angled piece 12 and inclined piece I3 which is secured to the opposite ends of the first piece as by welds (not shown). The short arm or base 12a of the triangle is provided with mounting holes h and hi adjacent to its ends and the arm I211 which extends normal to the base l2a is provided with a number (in this case, eight) of longitudinal slots sl-sfl for the reception, at a selected distance from. the base I 2a of a U-bolt [4 within which the mast '9 is held by means of a suitably shaped clamping plate I5 and by nuts I6 and washers I! on the threaded arms of the U. The brace H for the bracket is provided at its inner end with an apertured tab Ha for attachment to the window frame 4 (Fig. 1) and at its outer end with a number of spaced holes mlm5 so that it may be afixed to the projecting arm l2b as by means of a bolt I8 at a selected point determined by the relative projection of the part of the window frame to which the base |2a of the bracket is affixed.
In mounting the duplicate brackets l and 8 upon the window frame 4 the preferred practice is to hold each bracket and its brace H in place, mark the mounting holes h and hi on the frame and drill (say) 1% holes for one inch lag screws (not shown). Since the brace I I for each bracket can be pivoted on its bolt 18 at the outer end of the bracket it may be shifted either down (as on the upper bracket 1) or up (as on the lower bracket 8) in attaching it to the frame 4. When the brackets 1 and B are in place and their U-bolts aligned by mounting them in selected ones of the slots sl-sB the nuts l6 are tightened to hold the mast 9 in place.
The mast 9 may comprise simply a one inch galvanized water pipe through which the transmission line l9 extends downwardly from the antenna ID to a point preferably below the window sill 6. The mast must be grounded, as by means of a wire 20 which is connected at its lower end to a metal ground rod 2! driven into moist earth. Screw eye insulators 22 suitably spaced tion provides a simple, inexpensive and trouble-- free means for mounting a television or similar I mast upon the exterior of a building having var.- ious roof and window sill dimensions.
What is claimed is:
Television receiving-antenna apparatus comprising means for mounting a mast upon the exterior of a building having an overhanging roof and a window frame including upright and sill portions which project difierent distances from said building-exterior beneath the overhanging portionof said roof, said'apparatus comprising a' pair of triangular brackets provided with mounting means on corresponding base-sides of said triangles whereby said brackets may be mounted one above the other on said differently projecting portions of said window-frame, said brackets being in the form of right triangles of duplicate construction and dimensions, a di-pole adjacent the 'upper end of said mast, notched U-shaped clamping plates, one for each bracket, for securing said mast in a vertical position to a projecting arm of each bracket at a selected distance from its base-side sufficient to clear the overhang of said roof, a brace for each bracket adapted to be attached at one end to said window frame and atpthe other end to a selected point on said projecting arm determined by the relative projection of the part of said window frame to which said base of said bracket is aflixed, and means whereby sa i d .mast carries a leadin.
' '7 ERNEST O. JOHNSON.
REEEBENCES CITED The following references are of record in the file of this'patentt' STATES PATENTS