A pivoting mechanism with gross and fine adjustment with a housing, an elongate shaft pivotally retained by the housing, resiliently deformable members retained by the housing, cam members coupled to the shaft wherein the cam members are disposed to deform the resiliently deformable members when the cam members are pivoted, and a locking slide bar for selectively causing the cam members to pivot with the shaft to produce gross adjustments in pivoting resistance. First and second ends of the shaft can act as an output interface for outputting the pivoting resistance exhibited by the shaft to a seat back structure, a seat bottom structure, or some other structure. A threaded rod rotated by a handle can adjust an initial deformation of the first resiliently deformable member for fine pivoting resistance adjustment.

A mobile task chair with a mobile base structure, a control mechanism, a seat bottom, and a seat back. A physical setting control mechanism is adjustable to control a physical setting of the mobile task chair, and a visual indicator provides a visual indication, such as an illuminated visual indication, of the physical setting of the mobile task chair as adjusted by the physical setting control mechanism. The physical setting control mechanism can be pivoting resistance adjustment mechanism, and the visual indicator can indicate a selected pivoting resistance based on a resistance sensed by a resistance sensor. Multiple physical setting control mechanisms and a corresponding multiplicity of separate visual indicators can be provided. The visual indicator can be selectively induced as by touch and can be effective for a given time period. Recommended settings can be provided and automatically or selectively induced.

A spring back hinge interconnects a backrest frame to a chair seat frame or is mountable to just the chair base frame, the spring back hinge being optionally fittable with a lever actuated locking assembly and the spring back hinge being fittable on a single side or both sides, alternative back rest frames being fittable to the spring back hinge.

A chair assembly includes a seat support structure, a back support structure, a back tensioning assembly adjustable between low and high tension positions, an actuator assembly adapted to adjust the back tensioning assembly between the low and high tension positions, a control input assembly actuable by rotating the portion of the control input assembly, and a control link assembly operably coupling the control input assembly with the actuator assembly to adjust the back tensioning assembly between the low and high tension positions upon rotation of the portion of the control assembly by a seated user, wherein a number of rotations of the portion of the control input assembly is not limited by the control link.

A method of assembling a spring inside of a tube includes providing a coil spring and a tube having a first retaining structure at a first end of the tube. The method includes positioning a rod in the tube. The spring is positioned in the tube, and a second retaining structure is attached to the rod with the spring positioned between the first and second retaining structures. A force is applied to the spring, and the second retaining structure is fixed at a position wherein the spring provides a desired preload.

A rebounding device includes a front member, a rear member, and at least two hinge assemblies. The front member has at least two spring arms affixed to it. Each hing assembly includes a housing which couples to an end of the rear member and a position lock mechanism contained at least in part within the housing so that in response o an input to the position lock mechanism, the front member and the rear member are moveable between a collapsed position and at least one operable position, wherein the front member is movable relative to the rear member during a rocking motion.

A stadium seat includes a mounting base configured to be connected to a support structure, a vertical support extending upwardly from the mounting base, a seat support movably coupled to the mounting base, and a back support coupled to the vertical support. The seat support is movable relative to the mounting base between a first position, in which the seat support is at a first horizontal distance from the vertical support, and a second position, in which the seat support is at a second horizontal distance from the vertical support, the first distance being different than the second distance.

A body support structure includes a base, a seat and a backrest, with the backrest connected to the base with a torsion leaf spring. The torsion leaf spring may be configured with a plurality of fingers, and/or one or more flex regions. One or more struts may be connected between the seat or backrest and the base. In another aspect, the seat and/or backrest may be supported with one or more links that provide a counter-intuitive motion. In another aspect, a link may be coupled to a support with a flexible blade.

A rebounding device includes a front member, a rear member, and a junction member releasably coupling the front member and the rear member is disclosed. The junction member enables the front member and the rear member move between a collapsed position and an expanded position, and the front member is movable relative to the rear member during a rocking motion when the junction member is in the expanded position. In one embodiment, the junction member comprises a ratchet gear, a spring-loaded pawl configured to engage the ratchet gear and prevent rotation thereof, and a torsion spring. Application of pressure by a user against the front member causes the front member to move toward the rear member, thereby loading the torsion spring. Removal of the pressure against the front member causes the torsion spring to unload, thereby biasing the front member away from the rear member.

A chair of an aspect of the present disclosure includes: a support base; and a chair body including a seat frame that extends in the forward-rearward direction and forms at least part of a seat, and a back frame that is provided in the rear end of the seat frame to be pivotable around an axis O1 extending in the left-right direction, extends upward from the seat frame, and forms at least part of a backrest. The support base includes a slider that supports, in front of the axis O1, the seat frame movably in the forward-rearward direction, and a backrest-supporting shaft that supports, below the axis O1, the back frame pivotably around an axis O2 extending in the left-right direction.