초록 ▼

An auto-returning height control assembly comprising a spindle which is inserted in an outer cylinder and one end is fixed to an end of the outer cylinder, and a first and second cam member which are inserted between the outer cylinder and a sleeve member so that the spindle can rotates about its lo

An auto-returning height control assembly comprising a spindle which is inserted in an outer cylinder and one end is fixed to an end of the outer cylinder, and a first and second cam member which are inserted between the outer cylinder and a sleeve member so that the spindle can rotates about its longitudinal axis and returns; its original place at the same time. At least one projection is formed on the sleeve member and the first cam member is fixed at the inside cylindrical surface of the outer cylinder. A projection is formed on the second cam member and the projection is inserted into the groove of a sleeve member and allows the up and down movement against the sleeve member. A spring is installed at the lower part of the second cam member to push the second cam member towards the first cam member.

대표청구항 ▼

[ What is claimed is:] [1.]1. An auto-returning height control assembly in which an outer cylinder and a spindle are included and the spindle is projected outwards inside the outer cylinder comprises;a sleeve member which covers and fixes an outer cylindrical surface of the spindle and in which more

[ What is claimed is:] [1.]1. An auto-returning height control assembly in which an outer cylinder and a spindle are included and the spindle is projected outwards inside the outer cylinder comprises;a sleeve member which covers and fixes an outer cylindrical surface of the spindle and in which more than one projection is formed along the direction of its axis;a first cam member which allows the sleeve member in which the grooves are formed to rotate about its logitudinal axis and in which an side is in slope and combined to an inside cylindrical surface of an outer cylinder;a second cam member in which a projection is formed inside the inner cylindrical surface and the projection is inserted into the groove of the sleeve member so that up and down movement against the sleeve member is done and rotates simultaneously with the sleeve member along the rotation direction of the sleeve member and in which a slope side corresponding to the slope side of the first cam member is formed; andan elastic member which pushes the second cam member inside the outer cylinder and makes the slope side of the first cam member and the second cam member contact one another.