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Wedge anchor for concrete

An expansion wedge anchor for insertion in a hole delimited by a wall comprises an expander member and an expansion number, the expander member being provided at a leading end of the expander member, the expander member comprising a flaring end, the expansion member being expandable at a trailing end thereof and being adapted to engage the wall of the hole when the expander member is positioned in the hole, wherein upon longitudinal withdrawal of the expander member from the hole, the expander member displaces longitudinally relative to the expansion member with the flaring end thereof gradually causing the trailing end of the expansion member to expand, whereby a trailing edge of the expansion member engages the wall of the hole. The trailing end is adapted, when expanded by the flaring member, to extend at an angle with respect to a longitudinal axis of said expander member.

In the method of setting the expansion wedge anchor in the hole, the following steps are found: providing an expander member and an expansion member; and displacing the expander member such as to cause a trailing end of the expander member to engage the wall of the hole.

Also known are undercut wedge anchors, wherein the hole formed in the support structure is enlarged with a tool at a distance from the visible opening of the hole such that the expandable undercut wedge anchor may thereafter be inserted in the hole until its expansion sleeve becomes located behind a shoulder defined at the junction of the enlarged area and the remainder of the hole. Once expanded, the expansion sleeve may abut this shoulder and thus retain the anchor in position in the support structure.

Therefore, in accordance with the present invention, there is provided an expansion wedge anchor for insertion in a hole delimited by a wall, comprising an expander means and an expansion means, said expansion means being provided at a leading end of said expander means, said expander means comprising flaring means, said expansion means being expandable at a trailing end thereof and being adapted to engage the wall of the hole when said expander means is positioned in the hole, wherein upon longitudinal withdrawal of said expander means from the hole, said expander means displaces longitudinally relative to said expansion means with said flaring means thereof gradually causing said trailing end of said expansion means to expand, whereby a trailing edge of said expansion means engages the wall of the hole.

More particularly, said trailing end is adapted, when expanded by said flaring means, to extend at an angle with respect to a longitudinal axis of said expander means.

Also in accordance with the present invention, there is provided a method of setting an expansion wedge anchor in a hole delimited by a wall, comprising the steps of: providing an expander member and an expansion member; and displacing said expander member such as to cause a trailing end of said expansion member to engage the wall of the hole.

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