Abstract: A joint arrangement for knockdown furniture includes a first spar having two mounting surfaces at lateral sides thereof at a same level; a pair of second spars, each having two end faces, each attached perpendicularly at one end face thereof to one of the mounting surfaces, therefore having two inward faces forming an angle therebetween; a substantially trapezoidal joint piece having two side surfaces conforming to the angle for being screw attached to one of the first spar and the pair of second spars; and a guiding means comprising a ridge on one of the side surfaces and the inward faces and a corresponding groove on the other of the side surfaces and the inward faces, whereby the joint piece can be positioned easily and accurately during assembly to strengthen the joint. An improved knockdown chair is provided using this joint arrangement.

Abstract: An armchair includes a back, a pair of siderests and front legs, which are secured together by fasteners in a position for using, and can be disassembled for being stored, shipped, and so on, or replacing one part thereof with a part equivalent in function but different in style. The fasteners include bolts and cylindrical members each having horizontal thread hole for screwing with the shank of a bolt, and vertical pin hole for the insertion of a locking pin, the bolt and cylindrical members are provided on two abutting parts to be joined together. Dowel pins which maintain the relative position of two parts temporarily before that two parts are secured by the bolts and cylindrical members, and wood screws obliquely inserted into two joined parts for further securing them.