Anchor bolt assembly

Claim 2

An expansible anchor plug adapted for use in a blind hole in a hard material, said plug comprising a tubular body having an upper cylindrical section and a lower generally spherical bulb section, said bulb section having a diameter larger than that of said cylindrical section, the outer surface of said bulb section having means adapted to grip the wall of said hole and impede rotation of said plug in said hole; said cylindrical section being provided with a plurality of longitudinal slots extended downwardly from the top of said plug for permitting partial radial expansion of said cylindrical section; said bulb portion being provided with a plurality of longitudinal slots extending upwardly from the bottom of said plug defining a plurality of radially resiliently deformable portions for permitting resilient compression of said bulb section to a diameter equal to that of said cylindrical section; an intermediate section of said plug between said cylindrical section and said bulb section being unslotted; the bore of said plug being provided with internal threads in said unslotted intermediate section.

Claim 3

The anchor plug of claim 1 in which said gripping means on said lower bulb section include external annular teeth.

Claim 4

The plug of claim 1 in which the bore of said plug is unthreaded adjacent the upper and lower bore openings, the upper unthreaded portion of said bore having a diameter equal to the major diameter of said threaded intermediate section, and the lower unthreaded portion of the bore having a diameter equal to the minor diameter of said threaded intermediate section.

Claim 5

An anchor bolt assembly adapted for use in a blind hole in a hard material, said assembly comprising in combination an expansible anchor plug comprising a tubular body having an upper cylindrical section and a lower generally spherical bulb section, said bulb section having a diameter larger than that of said cylindrical section, the outer surface of said bulb section having means adapted to grip the wall of said hole and impede rotation of said plug in said hole; said cylindrical section being provided with a plurality of longitudinal slots extending downwardly from the top of said plug for permitting partial radial expansion of said cylindrical section; said bulb portion being provided with a plurality of longitudinal slots extending upwardly from the bottom of said plug defining a plurality of radially resiliently deformable portions for permitting resilient compression of said bulb section to a diameter equal to that of said cylindrical section; an intermediate section of said plug between said cylindrical section and said bulb section being unslotted; the bore of said plug being provided with internal threads in said unslotted intermediate section; and a bolt comprising a cylindrical body section; head means for rotating said bolt connected to one end of said body section; an externally threaded section adapted to engage the internally threaded bore of said anchor pLug; an expansion section intermediate said body section and said threaded section having an effective diameter larger than the bore of the upper cylindrical section of said plug, whereby said cylindrical section is expanded by the entry thereinto of said expansion section; and a cylindrical plug section adjacent said expansion section, said plug section having a diameter not larger than the bore of the bulb section of said anchor plug.

Claim 6

An anchor bolt assembly adapted for use in a blind hole in a hard material, said assembly comprising in combination an expansible anchor plug comprising a tubular body having an upper cylindrical section and a lower generally spherical bulb section, said bulb section having a diameter larger than that of said cylindrical section, the outer surface of said bulb section having means adapted to grip the wall of said hole and impede rotation of said plug in said hole; said cylindrical section being provided with a plurality of longitudinal slots extending downwardly from the top of said plug for permitting partial radial expansion of said cylindrical section; said bulb portion being provided with a plurality of longitudinal slots extending upwardly from the bottom of said plug defining a plurality of radially resiliently deformable portions for permitting resilient compression of said bulb section to a diameter equal to that of said cylindrical section; an intermediate section of said plug between said cylindrical section and said bulb section being unslotted; the bore of said plug being provided with internal threads in said unslotted intermediate section; and a bolt comprising a cylindrical body section; head means for rotating said bolt connected to one end of said body section; an externally threaded section adapted to engage the internally threaded bore of said anchor pLug; an expansion section intermediate said body section and said threaded section having an effective diameter larger than the bore of the upper cylindrical section of said plug, whereby said cylindrical section is expanded by the entry thereinto of said expansion section; and a cylindrical plug section adjacent said expansion section, said plug section having a diameter not larger than the bore of the bulb section of said anchor plug.

Claim 7

The assembly of claim 4 wherein the cylindrical body section of said bolt has a diameter equal to that of the upper cylindrical section of said anchor plug.

Claim 8

The assembly of claim 5 wherein said expansion section comprises a tapered section varying in diameter from the diameter of said cylindrical body section to the diameter of the bore of the upper cylindrical section of said anchor plug.

Claim 9

The assembly of claim 4 wherein the cylindrical body section of said bolt has a diameter smaller than that of the upper cylindrical section of said anchor plug.

Claim 10

The assembly of claim 7 wherein said expansion section comprises fluted dimples formed in the body section of said bolt.

Claim 11

The assembly of claim 7 in which said bolt has a uniform diameter threaded body which is provided with lock means comprising a threaded collar which enters the upper bore section of said anchor plug to prevent collapse thereof.

Claim 12

The assembly of claim 5 in which said gripping means on the lower bulb section of said anchor plug include external annular teeth.

Claim 13

The assembly of claim 5 in which the bore of said anchor plug is unthreaded adjacent the upper and lower openings, the upper unthreaded portion of said bore having a diameter equal to the major diameter of the threaded intermediate section of said anchor plug and the lower unthreaded portion of the bore having a diameter equal to the minor diameter of the threaded intermediate portion of the bore of said anchor plug.