Patent ID: 6390435
Filing Date: 2002-05-21
Classification: E04H

Abstract:
Mast base, comprising a rigid body (10), intended to support a mast mounted thereon, and four supporting legs (15), serving to support said body in a position in which said body is elevated from a substrate (14) for the mast base, said supporting legs extending laterally from the body (10) in mutually diverging directions and being provided, at their outer ends, with supporting feet (16), by which they may rest on said substrate (14), each supporting leg (15) comprising an upper arm (17), which, at its inner end, is pivotally connected to an upper portion of the body (10) for pivoting movement relatively to the body around a first horizontal pivot axis (x1), and a lower arm (18), which, at its inner end, is pivotally connected to a lower portion of the body (10) for pivoting movement relatively to the body around a second horizontal pivot axis (x2), said two arms (17, 18) of said each supporting leg (15) being pivotally connected to each other at their outer ends for pivoting movement relatively to each other around a third horizontal axis (x3) and at least one (18) of said two arms (17, 18) having a variable length, characterized in that the upper arm (17) of each one of the two supporting legs (15) of a first pair of such legs which are located at mutually opposite sides of the body (10) and which extend laterally from the body in mutually opposite directions, is pivotally connected directly to the body (10) by means of two separate pivot joints (19), which together define said horizontal pivot axis (x1) and which are located at a substantial distance from each other as seen in the direction of said first horizontal axis (x1);wherein stay wires to counteract variable rotation of the body around a vertical axis of mast are eliminated.