Importance

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Abstract

This expansion anchor consists of a cylindrical body having an axial bore therethrough and first and second axial ends. A wing support member extends from the first end of the cylindrical body and generally has a central cylindrical section shape. The wing support member has first and second opposed planar surfaces extending parallel to a central bore which is co-axial to and extends the axial bore in the cylindrical body. The first and second opposed planar surfaces of the wing support member join perpendicularly with the first axial end of the cylindrical body to form first and second recessed shoulder spaces, respectively, therewith. Formed as a part of the unitary plastic anchor are first and second expanding wing elements. These wing elements have a planar engagement surface which are hingedly connected to the wing support member along the planar surface of the wing support member such that the wing elements are movable from a collapsed, axial position to an open, radial position. The first and second expanding wing elements have shoulders disposed for being received in the recessed shoulder spaces when the first and second expansion wing elements are in their open position. In this manner, the first and second expanding wing elements are supported against axial movement beyond the open radial position by the first radial surface of the wing support element and by the first axial end of the cylindrical body.

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First Claim