Patent ID: 6964411
Filing Date: 2005-11-15
Classification: A47C,F16F,Y10T

Abstract:
1. A column unit, comprising: a fixed upright tube having a bottom upright-tube end and a top upright-tube end; a telescopic tube axially displaceably guided in said upright tube for moving between a fully inserted position to a maximally withdrawn position; a pneumatic spring having a cylinder and a piston rod, said cylinder being axially displaceably guided in said telescopic tube, said piston rod having a free end projecting out of said cylinder and fastened to said upright tube proximate said bottom upright-tube end, said cylinder having a carry-along stop for carrying the telescopic tube out of said upright tube when said pneumatic spring is moved axially; and a securing element arranged on said upright tube for limiting an axial movement of said telescopic tube out of said upright tube, said securing element being urged resiliently radially inward such that said securing element abuts an outer cylindrical lateral surface of said telescopic tube, wherein a latching recess is defined on said outer cylindrical lateral surface of said telescopic tube, said securing element being latchable in said latching recess when said telescopic tube is withdrawn from said upright tube to said maximally withdrawn position to thereby prevent further withdrawal of said telescopic tube from said upright tube.