Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Longitudinally extensible by flexible drive or hoist
Patent
1984-08-01
1986-04-08
Levy, Stuart S.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Longitudinally extensible by flexible drive or hoist
52111, 254400, E04H 1218, E04H 1234
Patent
active
045803773
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a telescopic mast which includes a plurality of mast sections which can be displaced relative to one another while guiding each other, and which are arranged to be extended one from the other with the aid of a single continuous line which passes along and co-acts with all said sections, from the innermost section to the outermost section.
BACKGROUND ART
Such telescopic masts, which are primarily intended for temporary use, have a very wide range of use. They are used, inter alia, as aerial masts by the armed forces, by Telecommunications Administrations, and by Television Companies. They are also used as standards for electric lighting equipment, measuring and control equipment, and the like. Consequently, it must be possible to transport and erect the masts in a relatively easy fashion.
Most of the masts used today need to be guyed or otherwise stiffened when erected, which renders it more difficult to erect the mast and greatly extends the time required herefor. The lines of known masts lie outside the mast and are hence unprotected and liable to be damaged by the rough treatment to which such masts are subjected. In addition hereto, the unprotected, externally located lines are also liable to pick-up dirt and other foreign matter and to carry the same into the mast interior, which can readily impair the telescopic function of the mast. Furthermore, the type of mast most used today includes a plurality of separate lines, which, among other things, makes line changes extremely expensive, since such changes make it necessary to dismantle the mast sections completely.
Another disadvantage with most of the known masts is that the mast sections are not lifted from the centre of the mast, and hence the sections are liable to jam and become stuck.
OBJECT OF THE INVENTION
A prime object of the invention is to provide a telescopic mast of the aforementioned kind with which, inter alia, the aforementioned disadvantages are eliminated. Thus, it shall not be necessary to guy the mast, and it shall be possible to extend and collapse the mast with the aid of a single, readily replaceable line which extends fully protected within the mast.
BRIEF SUMMARY OF THE INVENTION
To this end, each of the mast sections of a mast constructed in accordance with the invention is provided at the bottom thereof with at least one lower line-guide pulley and at the top thereof with at least one line-returning means, and the line portion located between the guide pulley and the line-returning means of one mast section and between said line-returning means and the guide pulley of the nearest inwardly lying mast section extends fully protected in a space located between said sections. In this way, the line remains totally encased within the mast, so that no part of said line lies exposed, and hence the line is guarded against possible damage from outside forces. In addition, an old line can be readily changed for a new line, by simply attaching the new line to the old one, and drawing it through the mast structure.
The line-returning means of each mast section is suitably connected with and located partially outside its respective section. The line-returning means conveniently comprises two line pulleys which are arranged substantially vertically at an angle to one another and which are arranged to guide the line towards and away from a further pulley which extends substantially horizontally and which lies above said vertical pulleys. In this respect, the two vertical line pulleys project inwardly through an opening in the wall of an associated mast section.
In a preferred embodiment, the lower line-guide pulley of each section is arranged substantially centrally in the lower part of said mast section, which, among other things, prevents jamming of the sections. In this respect, the diameter of the guide pulley corresponds substantially to the internal measurements of its respective section, said pulley being arranged to project through an opening formed in the wall of said section
REFERENCES:
patent: 1319943 (1919-10-01), Bessolo
patent: 1400435 (1921-12-01), Heil
patent: 2006388 (1935-07-01), Ellis
patent: 2508835 (1950-05-01), Moon et al.
patent: 2795303 (1957-06-01), Muehlhause et al.
patent: 2800206 (1957-07-01), Thorpe
patent: 2983474 (1961-05-01), Hanna
patent: 3328921 (1967-07-01), Keslin
patent: 3952467 (1976-04-01), Partlow
Levy Stuart S.
Stodola Daniel P.
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