Telescopic Module

Abstract

A telescopic module, which may be incorporated in a desk or a chair to elevate or lower a worksurface, includes a first tube, second tube, and a plurality of rollers. The first tube has a passageway, in which the second tube is received for reciprocation. The rollers are pivoted on the second tube or the first tube, or both to touch an inner side of the first tube and an outer side of the second tube to be turned when the second tube is moving. The rollers may reduce the friction between the first and the second tubes when the second tube is moving.

What is claimed is: 
     
         1 . A telescopic module, comprising:
 a first tube having a passageway therein;   a second tube received in the passageway of the first tube for reciprocation; and   a hub, on which a roller is pivoted, wherein the hub is connected an end of the first tube with the roller touching an outer side of the second tube, and the roller is turned when the second tube is moved related to the first tube.   
     
     
         2 . The telescopic module of  claim 1 , wherein the roller is covered neither by the first tube nor by the second tube. 
     
     
         3 . The telescopic module of  claim 1 , wherein the hub has a portion attached to an outer side of the first tube. 
     
     
         4 . The telescopic module of  claim 1 , wherein the hub has a portion against the end of the first tube, on which the roller is pivoted.