expansion sleeve

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.