초록 ▼

The present invention provides improved heat-shrinkable electrofusion fittings and methods. The fittings are basically comprised of an electrically heatable tubular plastic outer member which is shrinkable when heated to a transition temperature, an electrically heatable tubular plastic inner member

The present invention provides improved heat-shrinkable electrofusion fittings and methods. The fittings are basically comprised of an electrically heatable tubular plastic outer member which is shrinkable when heated to a transition temperature, an electrically heatable tubular plastic inner member positioned within the outer member which has a fusion temperature higher than the transition temperature and an electrically activated induction coil for energizing the inner and outer members.

대표청구항 ▼

[ What is claimed is:] [1.] An improved heat-shrinkable electrofusion fitting comprising:an electrically heatable tubular plastic outer member which is shrinkable from a first size to a smaller second size when heated to a transition temperature;an electrically heatable tubular plastic inner member

[ What is claimed is:] [1.] An improved heat-shrinkable electrofusion fitting comprising:an electrically heatable tubular plastic outer member which is shrinkable from a first size to a smaller second size when heated to a transition temperature;an electrically heatable tubular plastic inner member positioned within said outer member which has an internal size for receiving at least one complimentary plastic fitting to be fused thereto and which melts and fuses with said complimentary fitting when heated to a fusion temperature which is higher than said transition temperature of said outer member; andan electrically activated induction coil positioned with respect to said outer and inner members for simultaneously energizing and causing said members to be heated to said transition temperature and said fusion temperature, respectively, whereby said outer member shrinks towards its smaller size and clamps said inner member against said complimentary fitting and said inner member fuses under pressure with said complimentary fitting.