Patent ID: 6845559
Filing Date: 2005-01-25
Classification: A62C,F16L,Y10T

Abstract:
1. A method for coupling a protective net to a flexible tube for a sprinkler, comprising: wrapping a flexible tube having crest and valley portions with a meshed cylindrical protective net made of stainless steel wire, in a manner such that inward parts of straight tube portions of both ends of the flexible tube are wrapped with both ends of the protective net; winding both ends of the protective net with stainless steel wire of larger diameter than the wire of the protective net, so as to fix temporarily both ends of the protective net to the inward parts of the straight tube portions; applying welding material to both ends of the protective net; fusing the welding material so that the fused welding material is introduced between both ends of the protective net and the inward parts of the straight tube portions, thereby welding the flexible tube and the protective net, while solution heating the flexible tube so as to remove stress and work hardening; and unwinding and removing the steel wire from both ends of the protective net.