US 4,408,938 A · Expansion sleeve

Abstract

An expansion sleeve for attaching objects to a relatively thin panel comprises a hollow headed bolt threaded externally for its full length and threaded internally at an end portion remote from the head. The unthreaded internal portion of the bolt has an inwardly projecting apertured annular shoulder into which a drift pin may be driven to expand the sleeve on the interior side of a panel to which the sleeve is to be attached. A jamb nut pulls the expanded sleeve portion firmly against the inside of the panel member and thereafter a threaded rod is threaded into the interior threads of the sleeve so that a nut on the threaded rod may be tightened against the sleeve head. This draws the inner end of the sleeve toward the panel member to increase the pressure of the expanded sleeve portion against the panel. An object to be attached to the panel is then connected to the protruding end of the threaded rod.

Claims7

Dependent claims

An expansion sleeve comprising

a hollow elongated member having inner and outer ends and a bore,
projection means formed in said bore between said sleeve ends and projecting inwardly to form an opening smaller than the diameter of said bore, whereby a tapered tool may be driven into said bore and through said opening of said projection means to expand a portion of said sleeve adjacent said projection means,
means for pulling said sleeve outwardly of a sheet member having a hole through which said sleeve has been inserted to press said expanded sleeve section against said sheet member,
said sleeve being internally threaded for at least a portion of its length between said projection means and said inner end, whereby said opening in said projection means may be expanded by said tool to the size of said bore and an externally threaded hanger may be inserted through said outer end into threaded engagement with said internal threaded portion of said sleeve to maintain said expanded sleeve portion in expanded condition and to urge said inner end and said expanded sleeve portion against said sheet.

1 more element

Dependencies are inferred from the claim text.

Expansion sleeve

Life of this patent

Expansion sleeve

Life of this patent

Abstract

Claims7