Legged furniture, and leg adjuster and leg adjuster set for use in same

Legged furniture having four or more legs and a load-receiving stage supported directly or indirectly by these legs, comprising:

• three main legs among the legs defining a triangular shape, the three main legs enabling a stable stationary attitude of the load-receiving stage assuming that the legged furniture is placed by using only the main legs;
• and
• a leg adjuster forming an extension portion of a sub leg other than the main legs and capable of expansion/contraction in a vertical direction and providing an expansion/contraction leg in cooperation with the sub leg and autonomously allowing expansion or contraction of the expansion/contraction leg on the basis of a length of the main leg in accordance with the stationary attitude of the load-receiving stage, wherein
• the leg adjuster includes:
• an adjuster body attached to a lower end of the sub leg and capable of vertical expansion/contraction;
• urging means for urging the adjuster body in an expanding direction;
• and
• regulating means for regulating an expansion speed of the adjuster body having received an urging force of the urging means and a contraction speed of the adjuster body against the urging force;
• the adjuster body in the form of a hydraulic cylinder, comprising a outer cylinder being a leg end of the expansion/contraction leg and having an opening hole and a bottom part, a piston accommodated in the outer cylinder, a piston rod protruding from the outer cylinder through the opening hole, and a threaded portion provided at a distal end of the piston rod and screwed into a lower end portion of the sub leg;
• the urging means has a compression coil spring accommodated in the outer cylinder and extended between a lower part of the piston and the bottom part of the outer cylinder;
• the regulating means has two liquid chambers partitioned by the piston in the outer cylinder and a first micro clearance ensured between an inner circumferential surface of the outer cylinder and an outer circumferential surface of the piston in order to regulate flowing of a liquid between these liquid chambers;
• and
• the leg adjuster has leakage preventing means for preventing leakage of the liquid from the opening hole.