Patent ID: 7850806
Filing Date: 2010-12-14
Classification: H01R,H02G

Abstract:
1. A waterproof method for a wire end joint portion formed by integrally welding exposed parts of cores at ends of a plurality of wires forming a wiring harness to be installed in an automotive vehicle, comprising the steps of: preparing a transparent heat shrinkable tube having an inner diameter, a first open end, and a second open end; expanding the heat shrinkable tube to an inner diameter larger than the inner diameter when the heat shrinkable tube was formed; inserting a sealing member into the first open end of the transparent heat shrinkable tube; heating the first open end sufficiently so that a portion of the transparent heat shrinkable tube near the first open end shrinks and adheres to the sealing member; injecting a melted thermosetting waterproofing agent into the second end of the tube, the waterproofing agent having a solidification starting temperature higher than a shrinkage starting temperature of the heat shrinkable tube; inserting the wire end joint portion through the second open end of the waterproof protection tube so that the exposed parts of the cores of the wires are immersed in the melted waterproofing agent; and heating the heat shrinkable tube to a first temperature sufficient to shrink the heat shrinkable tube without solidifying the melted waterproofing agent so that the heat shrinkable tube causes the melted waterproofing agent to fill clearances adjacent to the wire end joint portion; and continuing heating the heat shrinkable tube to a second temperature sufficient to solidify the waterproofing agent after the heat shrinkable tube is shrunk thereby causing the waterproof agent to become solidified.