Patent ID: 6199806
Filing Date: 2001-03-13
Classification: A47B,A47C

Abstract:
A longitudinally displaceable column comprisinga vertical support tube;a base plate affixed to the support tube adjacent a lower end thereof; anda longitudinal adjusting unit having a rod supported at a lower end thereof on the base plate by an axial bearing so that the rod is rotatable relative to the base plate, the rod including an annular groove adjacent the base plate, the axial bearing being a sliding bearing that includes a sliding member, and the sliding member including locking projections engaged in the groove of the rod and forming a locking connection between the sliding member and the rod against axial movement of the rod relative to the sliding member and free spaces enabling radial expansion of the locking projections, the locking projections including bevels that upon engagement with the piston rod at assembly of the sliding member on the piston rod convert an axial motion of the sliding member in the direction of assembly into the radial expansion of the locking projections, while in the event of assembly of the sliding member in the wrong direction faces of the locking projections engage the piston rod and make further assembly motion at least difficult.