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Extendable pole
| Details |
Inventors: Frigon, Robert O.;
Assignee: Modern Technology Corp. (Dayton, OH)
Primary Examiner: Friedman; Carl D.
Assistant Examiner: Leno; Matthew E.
Attorney, Agent or Firm: Biebel & French
An extendable pole or mast is constructed from a plurality of nested pole sections with each pole section is made from an initially flat sheet which is roll formed into a rectangular, preferably square, cross section element. A seam is formed by over lapping the edges of the sheet, with the bulk of the seam being placed inwardly of the element. Each of the inner sections includes its own seam and an offset of sufficient size and depth to receive the seam and offset of an outer sections. The sheet material permits tabs to be cut or stamped into outer walls of the outer sections in order to support an adjacent inner pole section. Tabs are formed in each of the outer pole sections. These tabs are biased to extend inwardly, against the adjacent inner pole section. Tabs may be formed below the first tab to provide a choice in the amount of extension of the pole. |
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DETAILED DESCRIPTION In the present invention, an extendable pole or mast is constructed from a plurality of nested pole sections.
Each pole section is formed from an initially flat, elongated rectangular sheet having parallel edges which is roll formed into a rectangular, preferably square, cross-section element.
A joint or seam is formed by overlapping the edges of the sheet along the length of the pole section, with the bulk of the seam being placed inwardly of the pole section.
In the preferred embodiment, there are four pole sections.
Each of the inner sections includes its own joint and at least one relief, notch or offset of sufficient size and depth to receive the joint and notch of the outer sections.
Thus, the first inside section includes only one notch to receive the joint of the outermost section; the second inside section includes two notches to accommodate the joint of the second section and the second section's notch; and the third inside section includes three notches.
The sheet material is preferably of steel or aluminum which is both thinner and stronger than the materials used in making extruded elements.
This thinner and stronger material permits tabs to be cut or stamped into outer walls of the outer sections in order to support an adjacent inner pole section.
These tabs are biased to extend inwardly, against the adjacent inner pole section.
Additional tabs may be formed below the first tab to provide a choice in the amount of extension.
Accordingly, it is an object of this invention to provide a multi-section, extensible pole comprising a plurality of nested pole sections, each pole section formed from a flat sheet into a rectangular cross-section element having an overlapping joint, each of the inner pole sections including a relief formed on at least one side to accommodate the overlapping joint formed on an adjacent outer pole section, and at least one tab formed in each of the outer pole sections for supporting an adjacent inner pole section as the inner pole sections are extended
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Vibration and Earthquake Isolation 
