Patent ID: 7487690

Claim:
An elevating mechanism for furniture, installed within a supporting base of an article of furniture so as to facilitate a vertical motion of a movable part relative to said supporting base, comprising: a transmission unit comprising a bolt ( 30 ) and a first cylindrical gear ( 31 ); the first cylinder gear being coaxially secured along a section of the transmission unit and being located above the bolt ( 30 ); a top end of the bolt ( 30 ) forming a short post ( 61 ); a nut ( 20 ) engaged with a threaded section of the bolt ( 30 ), a horizontal transmission shaft ( 40 ) and a second cyliadrical gear ( 41 ) coaxially secured along a section of the transmission shaft ( 40 ) and coupled with the first cylindrical gear ( 31 ) of bolt ( 30 ); two ends of the transmission shaft ( 40 ) forming two other short posts ( 61 ) with the same polygonal cross section as that of the short post ( 61 ) of the bolt ( 30 ); the rotary handle ( 60 ) being provided with a hole; the hole ( 61 ) serving for receiving either one of the short posts ( 61 ) so as to drive the first cylindrical gear ( 31 ) or the second cylindrical gear ( 41 ); and wherein in assembly, the first cylindrical gear ( 31 ) and the second cylindrical gear ( 41 ) are directly coupled such that the first cylinder gear ( 31 ) is in contact with the second cylindrical gear ( 41 ), the rotation of the transmission shaft ( 40 ) will cause the bolt ( 30 ) to rotate simultaneously, wherein the rotary handle ( 60 ) will activate a rotation of the bolt ( 30 ) with respect to the nut ( 20 ) and an upward or downward motion of the article connected to the bolt ( 30 ) with respect to the article on which the nut ( 20 ) is mounted.