Patent ID: 8267360

Claim:
A height adjustable holding apparatus for holding an object, comprising: a support; a holding unit fixedly disposed at a top end of the support; a support accommodation portion disposed at a bottom end of the support, wherein the support accommodation portion contains a shaft; a moving part being movable along and within the length of the support, wherein the object connects to the moving part to be movable along the support; an elastic member disposed at the bottom end of the support, wherein the elastic member is a constant force spring having a rolled ribbon part and an unrolled plate part, wherein the rolled ribbon part connects to the unrolled plate part, wherein the rolled ribbon part is disposed in the support accommodation portion and rotatably wraps around and connects to the shaft; and a linking unit having one end connecting to the moving part and the other end extending around the holding unit to connect to the elastic member; wherein when moving the object along the support to a desired position, the unrolled plate part of the elastic member extends from the support accommodation portion into the middle portion of the support, the object substantially remains balanced at the desired position by the cooperation of the holding unit, the elastic member and the linking unit; wherein the support has a front side facing the object and a rear side opposite to the front side, wherein a cross section from the front side to the back side is defined, wherein the width of the support accommodation portion in the cross section is greater than the width of the support in the cross section, wherein the width of the rolled ribbon part in the cross section is greater than the width of the unrolled plate part in the cross section.