Support plate for an anchoring device

Claim 1

IN COMBINATION OF AN ANCHORING EXPANSION BOLT INSERTED IN A HOLE IN A WALL SUCH AS A ROOF AND A SUPPORT ELEMENT FOR THE BOLT, THE EXPANSION BOLT HAVING A SHANK, A SCREW-THREAD ON THE END OF THE SHANK EXTENDING OUT OF THE HOLE, TIGHTENING MEANS SCREWTHREADEDLY ENGAGED ON THE SCREWTHREADED END OF THE SHANK, THE SUPPORT ELEMENT COMPRISING IN THE FREE UNCLAMPED STATE A PERIPHERAL OUTER PORTION FOR BEARING AGAINST SAID WALL, AN ANNULAR INNER PORTION, A CENTRAL APERTURE DEFINED BY SAID INNER PORTION AND PROVIDED FOR THE SHANK, AND AN ANNULAR INTERMEDIATE PORTION INTERCONNECTING SAID INNER PORTION AND SAID OUTER PORTION THE SUPPORT ELEMENT HAVING SUCH SHAPE IN RADIAL SECTION THROUGH SAID APERTURE THAT IN SAID OUTER PORTION THE SUPPORT ELEMENT IS SUBSTANTIALLY RECTILLINEAR AND IN SAID INTERMEDIATE PORTION AND SAID INNER PORTION THE SUPPORT ELEMENT EXTENDS DOWNWARDLY FROM SAID OUTER PORTION AND UPWARDLY TO SAID APERTURE IN AN APPROXIMATELY SINUSOIDAL FASHION, SAID INNER PORTION HAVING A BOTTOM FACE SUBSTANTIALLY IN THE SHAPE OF A CONCAVE DOME TRUNCATED BY SAID APERTURE, THE SHANK EXTENDING THROUGH SAID APERTURE AND THE TIGHTENING MEANS HAVING A CIRCULAR BEARING FACE ENGAGING SAID BOTTOM FACE AROUND SUBSTANTIALLY THE ENTIRE PERIPHERY OF SAID BEARING FACE AND EXERTING A CLAMPING FORCE ON THE SUPPORT ELEMENT WHEN THE TIGHTENING MEANS ARE SCREWED ALONG THE SHANK, AND THE SIZE OF SAID APERTURE BEING MUCH LARGER THAN THE SIZE OF THE SHANK SO AS TO PERMIT THE LATTER TO ASSUME ANY OF A WIDE RANGE OF INCLINED POSITIONS IN THE SUPPORT ELEMENT, THE ENTIRE PERIPHERY OF SAID BEARING FACE ENGAGING SAID BOTTOM FACE AT ALL TIMES DUE TO SAID DOME SHAPE OF THE LATTER.