Anchor construction for concrete walls or slabs

DETAILED DESCRIPTION It is an object of the invention to provide an anchor construction for use in concrete walls or slabs and which includes an anchor which may be fastened easily to a welded reinforcing trellis that is mounted in a predetermined grid pattern.
A high accuracy of the distances in the grid pattern and the cooperation of the anchoring orifice permits the fastening of parts to be mounted on the outside of the concrete wall without difficulty.
This and other objects are attained by the invention comprising a concrete anchor having a clamping member with an annular groove for connecting to the grid structure of a reinforcement in the concrete wall or slab.
The specific configuration of the annular groove formed by two flanges makes the convenient insertion of the clamping member into any mesh of the reinforcing trellis.
As the flanges are adapted to the square shape of mesh of the trellis, four "pairs of ears" are obtained, which upon the insertion of the clamping member to the reinforcing trellis, are facing the four corners of the mesh.
The concrete anchor, therefore, may be inserted into a mesh of the trellis in one of four positions, offset by 90 with respect to each other.
By rotating the clamping member in the mesh, the parts with a larger diameter of the annular groove are jammed against the slightly resilient rods, whereby a highly accurate fixation of the position of the concrete anchor is obtained.
During the insertion of the clamping member the reinforcing mesh is not bent out of shape.
The ratio of the two diameters of the annular groove to each other is chosen so that a rotation of 10.
degree.
to 45.
degree.
is sufficient to obtain the clamping of the concrete anchor.
If the concrete anchor is equipped with threads, the parts to be mounted may be simply screwed on.
The concrete anchor additionally comprises an anchoring orifice portion of the clamping member.
This anchoring orifice may be tilted with respect to the external surface of the concrete wall as the result of slight movement during the course of pouring the concrete wall or slab