Swivel-rocker base

A rocker support assembly for swivel and rocking support of a seat structure, said assembly including a roller member for anchoring atop a stationary base, an upper member disposed over and rotatably supported from said lower member for angular displacement relative thereto about an upstanding axis, said upper member including first front and rear portions disposed forward and rearward, respectively, of said axis, a seat support means mounted on and projecting upwardly from said upper member, a seat support member including second front and rear portions overlying said first front and rear portions, pivotally attached to said mount for oscillation about a horizontal transverse axis adjacent said upstanding axis and extending forwardly and rearwardly of said transverse axis, said seat support member being adapted to support a seat therefrom with front and rear portions of said seat overlying said second front and rear portions, expansion spring means connected and extending between said first and second front portions yieldingly resisting upward movement of said second front portion relative to said first front portion, vertically adjustable upwardly facing abutment structure carried by said first front portion and abuttingly engageable by said second front portion to limit downward swinging of the latter relative to said first front portion, said expansion spring means comprising a plurality of elongated inclined coiled expansion springs having their lower ends anchored to said first front portion and their upper ends anchored to said second front portion, said expansion springs being forwardly and upwardly inclined when said second portion is downwardly abutted against said abutment structure.