FLUID PRESSURE ACTUATED EXPANSION DEVICE FOR EXPANSION SHAFTS FOR SECURING THEREON SPOOLS OF MATERIALS SUCH AS PAPER, PLASTIC, FABRIC OR THE LIKE AND EXPANSION SHAFT ON WHICH SUCH DEVICES ARE APPLIED

摘要

A fluid pressure actuated expansion device for expansion shafts, the device including an expandable pressing shoe member (21), an inflatable tubular bladder (19) member cooperating with said shoe member (21) for actuating the expansion movement thereof and duct and valve means (18) connectable with pressure fluid ducts for conducting and controlling the pressure fluid flow into and out of said bladder member (19). A channel section shaped housing member (13) contains therein the shoe member (21) and the bladder member (19) and a connector member (18). The housing (13) with therein the bladder member (19) and the shoe member (21) and the connector member (18) constitutes a selfcontained replaceable expansion device unit.