A motorized positioning apparatus for a seating unit includes a motor assembly that is configured to move a pair of linkage mechanisms though a series of positions that arrange the seating unit in a closed position, open position, or extended position. The motor assembly is selectively and releasably coupled to the linkage mechanisms, to allow the motor assembly to be de-coupled from the linkage mechanisms to allow the seating unit to be manually closed by a user.

A recliner for variable adjustment between a substantially horizontal position and an ergonomic seating position includes right-hand and left-hand side parts, which are each made up of an outer side part and an inner side part. The recliner also comprises a backrest element and a seat-surface element, which are connected to one another for rotation via a first bearing rod, as well as a foot-part element, which is connected to the seat-surface element for rotation via a second bearing rod. The foot-part element is mounted between the right-hand and left-hand side parts via a third bearing rod. The first, second and third bearing rods are each mounted for translatory movement in a corresponding guide in the right-hand and left-hand side parts such that the backrest element, the seat-surface element and the foot-part element can be adjusted in a variable manner between a substantially horizontal position and an ergonomic seating position.

A double shell seat includes a base for resting on a floor, an outer shell supported by the base, and an inner shell movably supported within the outer shell. The inner shell has a seat support, a backrest support, and a hinge between the seat support and the backrest support. The inner shell is movable with respect to the outer shell from an upright condition in which the seat support has a position toward the rear of the outer shell, the backrest support has a position that is relatively vertical, and the hinge is at a first angle, to a reclined condition in which the seat support is forward of its position in the upright condition, the backrest support is less vertical than its position in the upright condition, and the hinge is open at a greater angle than the first angle. The seat is preferably free of coil springs.

A recliner for variable adjustment between a substantially horizontal position and an ergonomic seating position includes right-hand and left-hand side parts, which are each made up of an outer side part and an inner side part. The recliner also comprises a backrest element and a seat-surface element, which are connected to one another for rotation via a first bearing rod, as well as a foot-part element, which is connected to the seat-surface element for rotation via a second bearing rod. The foot-part element is mounted between the right-hand and left-hand side parts via a third bearing rod. The first, second and third bearing rods are each mounted for translatory movement in a corresponding guide in the right-hand and left-hand side parts such that the backrest element, the seat-surface element and the foot-part element can be adjusted in a variable manner between a substantially horizontal position and an ergonomic seating position.

A double shell seat includes a base for resting on a floor, an outer shell supported by the base, and an inner shell movably supported within the outer shell. The inner shell has a seat support, a backrest support, and a hinge between the seat support and the backrest support. The inner shell is movable with respect to the outer shell from an upright condition in which the seat support has a position toward the rear of the outer shell, the backrest support has a position that is relatively vertical, and the hinge is at a first angle, to a reclined condition in which the seat support is forward of its position in the upright condition, the backrest support is less vertical than its position in the upright condition, and the hinge is open at a greater angle than the first angle. The seat is preferably free of coil springs.

A chair seat sliding and locking mechanism includes a positioning tube and a sliding seat. The positioning tube is mounted to a rod of a chair base. The positioning tube is rotatable relative to the rod but is not longitudinally slidable. The sliding seat includes a coupling portion securely coupled with a chair seat. The coupling portion includes a receiving portion having a receiving hole with a catching portion. The positioning tube is received in the receiving hole. When the positioning tube is rotated relative to the rod to a first position in which a positioning portion of the positioning tube disengages from the catching portion, the sliding seat is movable along the positioning tube. When the positioning tube is rotated relative to the rod to a second position in which the positioning portion engages with the catching portion, the sliding seat is fixed relative to the positioning tube.

A motorized positioning apparatus for a seating unit includes a motor assembly that is configured to move a pair of linkage mechanisms though a series of positions that arrange the seating unit in a closed position, open position, or extended position. The motor assembly is selectively and releasably coupled to the linkage mechanisms, to allow the motor assembly to be de-coupled from the linkage mechanisms to allow the seating unit to be manually closed by a user.

An elastic seesaw-type tilting mechanism is provided, including: a base support, configured to be connected with a chair base through a chair column; a seat support, being pivotably mounted on the base support and configured to be connected with a seat; a backrest support, being pivotably mounted on the base support and configured to be connected with a backrest; a first elastic mechanism, being connected with the seat support and the backrest support to form an elastic seesaw mechanism; a second elastic mechanism, being connected with the base support and the seat support, the second elastic mechanism and the first elastic mechanism being respectively biased against the seat support in opposite directions. A swivel chair is further provided, including: one of the elastic seesaw-type tilting mechanism as described above, a seat, a backrest, a chair column and a chair base.

An elastic seesaw-type tilting mechanism is provided, including: a base support, configured to be connected with a chair base through a chair column; a seat support, being pivotably mounted on the base support and configured to be connected with a seat; a backrest support, being pivotably mounted on the base support and configured to be connected with a backrest; a first elastic mechanism, being connected with the seat support and the backrest support to form an elastic seesaw mechanism; a second elastic mechanism, being connected with the base support and the seat support, the second elastic mechanism and the first elastic mechanism being respectively biased against the seat support in opposite directions. A swivel chair is further provided, including: one of the elastic seesaw-type tilting mechanism as described above, a seat, a backrest, a chair column and a chair base.

A chair includes a base having two sideboards. Each sideboard includes first and second coupling portions respectively at rear and front portions thereof. A seat is mounted on the base. A third coupling portion and a fourth coupling portion are provided on each lateral side of the seat. Each fourth coupling portion is coupled to one of the second coupling portions of the base. The seat is movable in a longitudinal direction and has a front end supported by the second and fourth coupling portions. A positioning device is coupled with the third coupling portion of the seat and the base, providing support for the rear end of the seat. The positioning device positions the seat relative to the base. A backrest is mounted to a rear of the base and is pivotably connected to the rear end of the seat and the sideboards.