Patent ID: 7743466
Filing Date: 2010-06-29
Classification: E05F,E05Y,G06F,Y10T

Abstract:
1. A labor-saving pivotal shaft structure comprising: a fixed part and a movable part, wherein the movable part and the fixed part produce a frictional torque therebetween to provide the movable part with the functions of rotating, arresting, and positioning relative to the fixed part; and a torsion rod which is a rigid rod, whose one end is mounted onto the fixed part; wherein the fixed part is connected to a main frame, and the movable part as well as the other end of the torsion rod are respectively connected to a cover frame, and thus when the cover frame is being closed down, the fixed part is in a fixed condition and the torsion rod and the cover frame rotate together, leading to the torsion rod being in a twisted condition of storing energy; whereas when the cover frame is being opened up, the stored energy of the torsion rod is released to provide an auxiliary force, wherein the fixed part is a shaft, having an axle extending from one end axially, a connecting segment in the middle of the axle, a linking portion disposed on one end of the fixed part to connect to the main frame, and a connecting portion disposed on the other end of fixed part, wherein the connecting portion is radially machined to have an indented shaft slot to accommodate a snappingly engaged portion disposed on the one end of the torsion rod, which is further securingly retained on the connecting portion with a retaining strip mounted onto a shaft neck extending axially from the shaft slot; wherein the movable part is a tubular body, having a sleeve, a jointing portion disposed at an appropriate position to be mounted onto the cover frame, at least a wear resistant strip and a frictional strip attached on each side of the jointing portion, and at least an elastic body attached at the external side of the jointing portion, such that when the axle passes through therein, an end cap is provided to connect the wear resistant strip, frictional strip, and elastic body onto the connecting segment.