Heel Structure with Adjustable Height

Abstract

A heel structure with an adjustable height includes a support rod, adjustment rod, and retractable element. The support rod is penetrated by a through hole. Tracks and engaging grooves are disposed on the wall of the through hole. The engaging grooves are in communication with the tracks and run horizontally. The adjustment rod penetrates the through hole and undergoes displacement. Resilient engaging bumps are disposed above the adjustment rod and thus resiliently pressed within the tracks. The tracks abut against the engaging bumps such that the engaging bumps retract. The retractable element is rotated such that circular pipes of different diameters decreasing downward and stepwise are fitted together so as to be folded and unfolded. A hollow-core mounting region is defined centrally at the circular pipes. A fitting hole is disposed at the lowest circular pipe and fixedly disposed on an outer wall of the bottom of the adjustment rod.

What is claimed is: 
     
         1 . A heel structure with an adjustable height, comprising:
 a support rod penetrated by a pipe-shaped through hole, wherein tracks and engaging grooves are disposed on an inner wall of the through hole in such a manner that the engaging grooves are in communication with the tracks and run horizontally,   a retractable element; and   an adjustment rod being post-shaped to therefore penetrate the through hole of the support rod and undergo upward and downward displacement, wherein resilient engaging bumps are disposed above the adjustment rod and thus resiliently pressed within the tracks of the support rod, the tracks abut against the engaging bumps such that the engaging bumps retract to therefore attain a function of resilient pressing and positioning,   wherein the retractable element is rotated such that circular pipes of different diameters decreasing downward and stepwise are fitted together so as to be folded and unfolded, a hollow-core mounting region is defined centrally at the circular pipes, and a fitting hole of a small diameter is disposed at a lowest one of the circular pipes and fixedly disposed on an outer wall of a bottom end of the adjustment rod,   wherein the retractable element and the support rod are coupled to a shoe body, and a mere rotation of the adjustment rod is enough to drive the retractable element to change a height of the shoe body, so as to render usage easy, instant, convenient and flexible in terms of variations.   
     
     
         2 . The heel structure with an adjustable height according to  claim 1 , wherein a plane is disposed on a top surface of the support rod. 
     
     
         3 . The heel structure with an adjustable height according to  claim 1 , wherein the tracks are symmetrically disposed on two sides of the inner wall of the through hole, respectively, and the engaging grooves are opposite the tracks. 
     
     
         4 . The heel structure with an adjustable height according to  claim 1 , wherein an end of each said engaging groove of the support rod concavely defines an engaging stopping region in which the engaging bumps of the adjustment rod are resiliently engaged and positioned. 
     
     
         5 . The heel structure with an adjustable height according to  claim 1 , wherein the engaging bumps of the adjustment rod are symmetrically positioned. 
     
     
         6 . The heel structure with an adjustable height according to  claim 1 , wherein the engaging bumps of the adjustment rod are balls capable of retraction and bouncing. 
     
     
         7 . The heel structure with an adjustable height according to  claim 1 , wherein a resilient damping element is disposed on an upper wall of each said engaging groove of the support rod to resiliently press against the engaging bumps. 
     
     
         8 . The heel structure with an adjustable height according to  claim 1 , wherein a positioning leaf spring is disposed inside the support rod, a slot is disposed at a junction of an inner wall of each said track and a corresponding one of the engaging grooves, an upper guiding surface and a lower guiding surface, which are concavely curved, are disposed on two sides of the positioning leaf spring, respectively, and connected by a link zone therebetween, a tongue is disposed at a center of the link zone from below so as to be engaged with and fixed to the slot such that the link zone is oblique, the upper guiding surface and the lower guiding surface are disposed in each said engaging groove and on an inner wall at a lower portion of the support rod, respectively. 
     
     
         9 . The heel structure with an adjustable height according to  claim 8 , wherein the positioning leaf spring is made of metal or plastic.