Patent ID: 6827401
Filing Date: 2004-12-07
Classification: A47C

Abstract:
A rocker mechanism adapted for operably interconnecting a chair to a base, comprising:an upper casting adapted for interconnection with the chair; a lower casting adapted for interconnection with the base; a stop defined in one of a top surface of said lower casting and a bottom surface of said upper casting; and a first dual-rate leaf spring having a first end anchored to said upper casting on a first surface of said first dual-rate leaf spring and a second end anchored to said lower casting on said first surface, said first dual-rate leaf spring extending angularly between said upper and lower castings, said first dual-rate leaf spring having a fixed first effective spring rate defined by a first distance along said first surface between said upper and lower castings for rocking in a first direction and a fixed second effective spring rate defined by a second distance along a second surface between said upper and lower castings for rocking in a second direction, wherein relative pivotal motion between said upper and lower castings is limited by contact of said stop to one of said top surface of said lower casting and said bottom surface of said upper casting.