Adhesive anchor

Abstract

A construction anchor for mounting an object on a structure of masonry, concrete, metal or the like includes a metal anchoring portion and a plastic cap. The anchor is adapted to be inserted, metal end first, into a pre-drilled adhesive-filled hole. The cap has a flange that is larger than the hole diameter, so that the anchor may be inserted and seated in the hole at a consistent depth. When the adhesive has set, a screw or bolt is inserted through the plastic cap to engage the threads in an internal bore in the anchoring portion. The plastic cap serves not only to determine the depth of the anchor in the hole, but also to prevent adhesive and other material from entering the threaded interior of the anchor prior to use.

What is claimed is: 
     
       1. A construction anchor for retaining an object against. .,.!. a structure of masonry, concrete, metal or the like, said construction anchor, in use, being secured within a hole defined in said structure, comprising: a cylindrical anchoring portion having a threaded axial bore extending partially through said anchoring portion from one end thereof; and   a cap adapted to be snap-fit over said end to cover said threaded axial bore, said cap having an annular flange seatable on the periphery of said hole, so that said construction anchor may be set into said hole at a predetermined and consistent depth.   
     
     
       2. A construction anchor as claimed in claim 1 wherein said cylindrical anchoring portion is made of metal. 
     
     
       3. A construction anchor as claimed in claim 2 wherein said metal is zinc-plated steel. 
     
     
       4. A construction anchor as chimed in claim 1 wherein said cap is of a plastic material. 
     
     
       5. A construction anchor as claimed in claim 4 wherein said plastic material is polyethylene. 
     
     
       6. A construction anchor as claimed in claim 1 wherein said cylindrical anchoring portion has at least one first annular groove. 
     
     
       7. A construction anchor as claimed in claim 6 wherein said cylindrical anchoring portion has at least one second annular groove, said second annular groove being narrower in a longitudinal direction along said cylindrical anchoring portion than said first annular groove. 
     
     
       8. A construction anchor as claimed in claim 1 wherein said cylindrical anchoring portion has a plurality of annular grooves. 
     
     
       9. A construction anchor as claimed in claim 8 wherein said plurality of annular grooves includes at least one first annular groove and at least one second annular groove, said first annular groove being deeper than sa annular groove. 
     
     
       10. A construction anchor as claimed in claim 1 wherein said cylindrical anchoring portion has a plurality of longitudinal splines. 
     
     
       11. A construction anchor as claimed in claim 1 wherein said end of said cylindrical anchoring portion having said threaded axial bore has a narrowed extension with an annular groove extending thereabout, and said cap has an annular flange extending about the base of its inner surface, so that said cap may be snap-fit onto said cylindrical anchoring portion. 
     
     
       12. A construction anchor as claimed in claim 1 wherein said cap has an outer surface, said outer surface having a plurality or longitudinal raised ridges for disposing said construction anchor evenly within said hole in said structure. 
     
     
       13. A construction anchor as claimed in claim 1 wherein said cap has an upper surface, said annular flange being an extension or said upper surface, said upper surface being puncturable by the threaded end of a bolt to be secured within said construction anchor. .Iadd. 
     
     
       14.  A construction anchor for retaining an object against a structure of masonry, concrete, metal or the like, said construction anchor, in use, being secured within a hole defined in said structure, said construction anchor comprising a cylindrical member having a first end, a second end and a longitudinal axis, a threaded axial bore extending partially therethrough from said first end, and at least one first annular groove around said second end, thereby providing a lobe in said cylindrical member at said second end, said lobe having a surface oriented obliquely with respect to said longitudinal axis, said threaded axial bore terminating within said cylindrical member short of said at least one first annular groove and a cap tightly fitted upon said first end to cover said threaded axial bore..Iaddend..Iadd. 
     
     
       15.  A construction anchor as claimed in claim 14 wherein said cylindrical member is made of metal..Iaddend..Iadd.16. A construction anchor as claimed in claim 15 wherein said metal is zinc-plated steel..Iaddend..Iadd.17. A construction anchor as claimed in claim 14 wherein said cylindrical member has at least one second annular groove, said at least one second annular groove being narrower in a longitudinal direction along said cylindrical member than said at least one first annular groove..Iaddend..Iadd.18. A construction anchor as claimed in claim 17 wherein said at least one first annular groove is deeper than said at least one second annular groove..Iaddend..Iadd.19. A construction anchor as claimed in claim 14 wherein said cylindrical anchoring portion 
     
     
        has at least one longitudinal spline at said first end..Iaddend..Iadd.20. A construction anchor as claimed in claim 14 wherein said cylindrical anchoring portion has a plurality of longitudinal splines at said first end..Iaddend..Iadd.21. A construction anchor as claimed in claim 14 wherein said at least one first annular groove is a plurality of first annular grooves, each of said plurality being separated from one adjacent 
     
     
        thereto by a lobe..Iaddend..Iadd.22.  A construction anchor as claimed in claim 14 wherein said cap is of a plastic material..Iaddend..Iadd.23. A construction anchor as claimed in claim 22 wherein said plastic material is polyethylene..Iaddend..Iadd.24. A construction anchor as claimed in claim 14 wherein said first end of said cylindrical anchoring portion having said threaded axial bore has a narrowed extension with an annular groove extending thereabout, and said cap has an annular flange extending about the base of its inner surface, so that said cap may be snap-fit onto said cylindrical anchoring portion..Iaddend..Iadd.25. A construction anchor as claimed in claim 14 wherein said gap has an outer surface, said outer surface having a plurality of longitudinal raised ridges for disposing said construction anchor evenly within said hole in said structure, said longitudinal raised ridges centering and suspending said construction anchor in said hole..Iaddend..Iadd.26. A construction anchor as claimed in claim 14 wherein said cap has an upper surface, said upper surface being puncturable by the threaded end of a bolt to be secured within said construction anchor, said upper surface protecting said threaded axial bore from dirt..Iaddend..Iadd.27. A construction anchor as claimed in claim 26 wherein said upper surface of said cap and said threaded axial bore of said cylindrical anchoring portion are separated by a distance providing a stretch zone for a bolt..Iaddend..Iadd.28. A construction anchor as claimed in claim 14 wherein said cap has an annular flange seatable on the periphery of said hole, so that said construction anchor may be set into said hole at a predetermined and consistent depth..Iaddend.