Patent ID: 6164302
Filing Date: 2000-12-26
Classification: A45B

Abstract:
A collapsing mechanism used in automatic fourfold collapsible umbrellas comprising a fourfold collapsible umbrella stretcher structure that consists of:an umbrella rod with an upper nest and a slide runner;a secondary stretcher having an inner end pivotally coupled to said slide runner;a first main stretcher outwardly extending from said upper nest, said first main stretcher having an outer end pivotally connected to a middle segment of said secondary stretcher;a second main stretcher being arranged in parallel to said secondary stretcher, said second main stretcher having an inner end attached to a rear segment of said first main stretcher, said rear segment being adjacent said outer end first main stretcher;a third main stretcher having an inner end pivotally coupled to an outer end of said second main stretcher, said third main stretcher having a front segment adjacent said inner end pivotally coupled to an outer end of said secondary stretcher;a fourth main stretcher having an inner end rotatably connected to an outer end of said third main stretcher, said fourth main stretcher having an outer end pivotally coupled to a rear umbrella rib;two flexible ribs being respectively provided under said third main stretcher and above said fourth main stretcher; and,a resilient spring having an inner end attached to the outer end of said secondary stretcher and an outer end linked to a middle segment of said third main stretcher above said flexible rib disposed under said third main stretcher.