Core body for the recessed positioning of an anchor element in a concrete member

A core body assembly for the creation of an oblong arcuate recess in a face of a prefabricated concrete member and for the simultaneous positioning of an embedded anchor element in such a way that an eye portion of the anchor element is located in the center of said recess and below said face, the core body assembly comprising in combination:

• two inner core body parts of a combined shape which is similar in outline but smaller in dimensions than the shape of the desired recess, the inner core body parts being molded of a comparatively rigid and resistant material;
• a core body jacket enveloping substantially all surface portions of the inner core body parts, the core body jacket being molded of a comparatively flexible material, having an outer shape which represents the spatial negative of the desired reress;
• and
• means for releasably attaching the core body assembly to a formwork surface in such a way that a clamping action is exerted between the formwork and at least one of the inner core body parts;
• and wherein
• the core body jacket has an oblong rim defining the outline of a flat attachment face on the inner side of the core body assembly;
• the core body jacket further forms a transverse connecting bridge in the vicinity of the attachment face, the connecting bridge serving as a bending hinge between two halves of the core body assembly which envelop the two inner core body parts;
• the core body assembly forms a transverse anchor retaining groove of which the outer side of the connecting bridge constitutes the bottom, the anchor retaining groove having opposing anchor positioning flanks;
• and
• the anchor positioning groove includes means for positively positioning and clamping the eye portion of an anchor element when the core body assembly is attached to a formwork surface.