Plastic plugs for use in concrete forms

Claim 1

A plug molded from plastic material and intended for forming apparatus including a flat tie bar of generally rectangular cross section joining facing panels defining forms for use in making concrete walls or the like, wherein said plug comprises a hollow generally frustoconical body having an outer open end intended to be applied against the inner surface of a form panel and having an inner end to be embedded in the concrete of said wall, said inner end being closed by a straight web extending parallel with said outer open end, said body being further provided with guide means for said flat tie bar, the improvement therewith wherein: a. said body has a flat annular outer face at said outer end extending into a thin annular flexible circumferential sealing flange, said face intended to seat squarely against the inner surface of a form panel whereby to seal the inside of said hollow body against entry of concrete therein; b. said body is formed, exteriorly thereof and immediately behind said sealing flange, with a cylindrical shoulder intended to define, when said plug is removed from the said concrete, a recess for the insertion of a finishing closing cap, said body being further exteriorly frustoconical from said shoulder to the inner face thereof; c. said body is interiorly frustoconical from said outer to said inner ends and said guiding means comprise ribs integrally formed with said body and extending the full length thereof between said ends radially inwardly and diametrically opposite one another, said ribs being further formed along the inner faces thereof with right angular guiding grooves for the guiding of said flat tie bar, and d. wherein said inner end straight web has a rectangular opening therethrough in alignment with said guiding grooves for the passage of said flat tie bar.