Abstract: Each of the left and right support assemblies for a shiftable carriage mechanism for an incliner chair includes a toggle drive subassembly that includes an upper toggle link which is pivotally connected to a mounting rail of a frame subassembly, a lower toggle link which is pivotally connected to a base member of the frame subassembly and a drive spring which is connected to the upper toggle link. The drive spring operates to position the toggle links in a locked condition when the support assembly is retracted and to drive the support assembly into an extended condition when the toggle links are manually rotated to an unlocked condition.

Abstract: A shiftable carriage mechanism for an incliner chair includes a right support assembly, a left support assembly, a torque tube connected between the right and left support assemblies and an operating lever, each of the right and left support assemblies including a frame subassembly having a base member mountable on the chair frame, and a mounting rail movably positioned above the base member; a toggle drive subassembly for locking the mounting rail above the base member or, when unlocked, for moving the mounting rail towards the base member; and a footrest-legrest subassembly which will become extended when the mounting rail is moved towards the base member. No main extension spring connected between the mounting rails and the base members is utilized.