초록 ▼

An expansion anchor installable in a pre-drilled hole formed in a base material. The expansion anchor includes a bolt having a shaft with a head portion, an opposing end portion, and a threaded portion. A shoulder is disposed on the shaft intermediate the head portion and the end portion thereof, an

An expansion anchor installable in a pre-drilled hole formed in a base material. The expansion anchor includes a bolt having a shaft with a head portion, an opposing end portion, and a threaded portion. A shoulder is disposed on the shaft intermediate the head portion and the end portion thereof, and an expandable sleeve is disposed about the shaft between the shoulder and the end portion of the shaft. The expandable sleeve has an expandable upper sleeve portion and an expandable lower sleeve portion wherein the expandable lower sleeve portion is expandable outwardly before the expandable upper sleeve portion is expandable outwardly. A nut having a substantially conical surface is fixed rotationally in the pre-drilled hole and is engagable with the threaded portion of the shaft. The substantially conical surface of the nut is engageable with the expandable lower sleeve portion so as to expand the lower sleeve portion until the nut is axially fixed in the pre-drilled hole. The advancing bolt is subsequently drawn into the pre-drilled hole and the shoulder of the shaft is engagable with the expandable upper sleeve portion so as to outwardly expand the upper sleeve portion, whereby the expandable upper and lower sleeve portions are engageable with the wall of the pre-drilled hole so as to retain the expansion anchor therein.

대표청구항 ▼

[ What is claimed is:] [1.] An expansion anchor, installable in a pre-drilled hole having a generally cylindrical wall, comprising:a bolt having a shaft with a head portion, an opposite end portion, a longitudinal axis, and a threaded portion;a shoulder disposed upon said shaft intermediate said hea

[ What is claimed is:] [1.] An expansion anchor, installable in a pre-drilled hole having a generally cylindrical wall, comprising:a bolt having a shaft with a head portion, an opposite end portion, a longitudinal axis, and a threaded portion;a shoulder disposed upon said shaft intermediate said head portion and said opposite end portion of said shaft;an expandable sleeve disposed about said shaft between said shoulder and said opposite end portion of said shaft, wherein said expandable sleeve has an expandable upper sleeve portion comprising at least two expandable upper fingers, and an expandable lower sleeve portion comprising at least two expandable lower fingers;a nut having a substantially conical surface portion defined between a first portion of said nut having a first diameter and a second portion of said nut having a second diameter, said nut also having a threaded bore engageable with said threaded portion of said shaft;said substantially conical surface portion of said nut being engageable with said expandable lower sleeve portion while said shoulder is engageable with said expandable upper sleeve portion when said threaded portion of said shaft is advanced relative to said threaded bore of said nut so as to respectively expand said expandable lower sleeve portion and said expandable upper sleeve portion such that said expandable lower sleeve portion and said expandable upper sleeve portion are engageable with the wall of the pre-drilled hole; andmeans for causing outward expansion of said expandable lower sleeve portion prior to outward expansion of said expandable upper sleeve portion when said threaded portion of said shaft is advanced through said threaded bore of said nut.