Abstract: A pivot hinge has two pivot members for engaging bores in two parts to be rotatably coupled to each other. Each pivot member has a first portion sized for insertion into one of the bores. Either a single continuous rib or a plurality of rib segments are formed on the outer surface of the first portion for gripping the inner surface of the bore. Either one or both of the pivot members has a second portion which provides a thrust bearing between the two joined parts. The two pivot members are coupled to each other by a bearing which allows each member to rotate independent of the other and a releasable lock mechanism which, when engaged, prohibits lateral separation of the two pivot members and, when disengaged, permits separation of the two members to allow separation of the parts.

Abstract: An article of furniture includes frame members, a seat member supported on the frame member, a concealed joint for pivotally coupling two frame members to each other, and an attachment for coupling the seat to the frame members. The two frame members include truncated bores for concealing the joint. The pivotal joint includes a pair of connecting members which are received in the truncated bores in fixed relationship to the frame members. Each connecting member has an opening for receiving a bearing member. A retainer is inserted through the bearing member and engages both connecting members to prevent lateral separation of the frame members. Each connecting member is independently rotatable on the bearing member.