Patent ID: 7497413
Filing Date: 2009-03-03
Classification: A47C

Abstract:
1. A support post for supporting an object, comprising: a tube axially extending between opposite inner and outer ends; a support plate fastened to the inner end of the tube; a cylinder having an inner sealed end and an outer end and filled with a pressurized gas, the cylinder being reciprocally displaceable in the tube between an unloaded position and a loaded position and operative to axially rotate relative the tube; a piston reciprocally displaceable within the cylinder so as to define two working pressure chambers in flow communication with one another; a stop fixed to and surrounding the inner end of the cylinder, the stop comprising a first helical stop surface; a piston rod fixed to the piston and having an inner free end inwardly extending through the first helical stop surface of the annular stop, the free end inwardly projecting from the support plate in the loaded position of the cylinder and rested on the support plate in the unloaded position of the cylinder, and a guide bush unit fixed to the outer end of the tube and comprising: an axially extending spacer coupling the bush and the bush stop ring with one another.