Supports – Brackets – Article holding means
Patent
1991-04-02
1992-12-29
Johnson, Blair M.
Supports
Brackets
Article holding means
2482184, A47G 110
Patent
active
051745356
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This Invention relates to a cross-arm mounting bracket for poles The invention is applicable to the mounting of cross-arms on electricity or telephone poles or the like.
2. PRIOR ART
Each year there are many disruptions to electricity supply due to the failure of the cross-arms on electricity poles. The cross-arms are subject to great extremes of temperature (e.g. from -30.degree. C. to +60.degree. C.); extremely high solar radiation; rainfall; high winds; humidity changes (from 10-100% which causes the timber to swell and shrink generating internal stresses); and industrial pollution and salt spray settling; on the arms, which attacks the timber.
To these atmospheric conditions must be added the weaknesses induced in the cross-arms by the holes drilled therein to receive the king bolts mounting the cross-arms to the posts; the holes for the diagonal braces; and the holes for the insulators. Not only do these holes reduce the effective dimensions of the cross-arms but they are also liable to rot and decay, which increases their size and reduces the cross-arm strength. Movement of the insulator pins in their holes, especially as the timber shrinks, further increases the problem.
SUMMARY OF THE INVENTION
Observation has shown that the top surface of the cross-arm is subject to much greater decay than the sides, due to the great exposure time to the sun and the settling of water/industrial pollution/salt thereon, which all attack the top surface. This greater decay could be alleviated if the cross-arms did not have a horizontal surface and so it is proposed that the cross-arms be mounted horizontally on the poles where the upper surfaces of the cross-arms are diagonally (or downwardly) inclined. Each time it rains, the water will simply run off, washing the cross-arms clean, instead of pooling on the top surface and settling in the cracks where fungal decay is encouraged by the collected pollutants. (If the cross-arms can be aligned North-South, they will receive less solar radiation).
The insulators may be fixed to the cross-arms by a bolt passing through the diagonal of the arm, with an angled cover over the bolt hole, or by a clamp around the arm to avoid drilling the cross-arms. Specialized insulators may be mounted via specialized brackets.
It is an object of the present invention to provide a mounting bracket for cross-arms for poles where the cross-arms are mounted horizontally on the poles with their faces diagonally inclined.
It is a preferred object to provide an improved method for mounting the insulators which reduces, or eliminates, the problem of rot or decay around the mounting of the insulators on the cross-arms.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect, the present invention resides in a mounting bracket for cross-arms for poles including:
a substantially vertical base plate mountable on the pole by fastening means;
a substantially V-shaped cradle mounted on, or on the front of, the base plate to receive and support the cross-arm so that the faces of the cross-arm are diagonally inclined; and
means on the cradle to receive fastening means to secure the cross-arm in the cradle.
The base plate may have a curved back, or have a planar back with rearwardly directed side flanges, to locate it on the post and the base plate is preferably secured to the pole by at least a single bolt adjacent the upper end of the base plate. Additional bolts may be used if preferred.
Preferably, the cradle extends transversely, horizontally at, or adjacent to, the lower end of the base plate so that diagonal braces between the cross-arm and the post are not required.
Where the cross-arms are to be mounted on the top of the poles, or on extensions from the top of the poles, the cradle preferably extends transversely, horizontally at, or adjacent to, the upper end of the base plate and a pair of such mounting brackets may be provided, diagonally opposed on the pole, for each cross-arm.
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REFERENCES:
patent: 950859 (1910-03-01), Michaud
patent: 1956340 (1934-04-01), Bernhardt
patent: 2024892 (1935-12-01), Soper
patent: 2443149 (1948-06-01), Rundell
patent: 2592057 (1952-04-01), Murphy
Johnson Blair M.
Vanbrace Pty. Ltd.
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