A seating apparatus for supporting a portion of a user, the seating apparatus comprising a reorientable seat portion including a seat platform and a cutout, wherein the seat selectively underlies a first ischial tuberosity of the user but not the second ischial tuberosity, the selection of which is determined by the orientation of the reorientable seat portion.

A quick-release device is for securing a rod of any gas cylinder into the plate of any chair, item of furniture, or other device supported by a gas cylinder and activating the rod with a button thereon. This universal quick-release device includes a sleeve in in the seat plate, an adapter fit into the sleeve, the adapter including an upper portion and a lower portion with different inner and outer diameters. The sleeve is configured to receive the lower portion of the adapter in a press-fit engagement. The upper portion is configured to receive the rod of the gas cylinder in a removable engagement.

A quick-release device is for securing a rod of any gas cylinder into the plate of any chair, item of furniture, or other device supported by a gas cylinder and activating the rod with a button thereon. This universal quick-release device includes a sleeve in in the seat plate, an adapter fit into the sleeve, the adapter including an upper portion and a lower portion with different inner and outer diameters. The sleeve is configured to receive the lower portion of the adapter in a press-fit engagement. The upper portion is configured to receive the rod of the gas cylinder in a removable engagement.

A detachable swivel tin chair comprises a seat, chair leg and tray, the tray comprises an upper connecting tray, a lower connecting tray and a rotating device. The rotating device comprises a first connecting piece, a ball bearing and a second connecting piece. The first and second connecting piece rotate relative to each other through the ball bearing, the seat is fixedly connected to the upper end of the upper connecting tray. The chair legs include tour supporting legs, the upper end of the legs are provided with an arc-shaped folded edge, which is provided with three first screw holes, the lower end of the lower connecting tray is provided with second screw holes. A long annular reinforcing rib is welded on the middle and lower sections of the supporting leg and connecting pieces are welded at the middle and lower sections on the inner side of the supporting feet.

A detachable swivel tin chair comprises a seat, chair leg and tray, the tray comprises an upper connecting tray, a lower connecting tray and a rotating device. The rotating device comprises a first connecting piece, a ball bearing and a second connecting piece. The first and second connecting piece rotate relative to each other through the ball bearing, the seat is fixedly connected to the upper end of the upper connecting tray. The chair legs include tour supporting legs, the upper end of the legs are provided with an arc-shaped folded edge, which is provided with three first screw holes, the lower end of the lower connecting tray is provided with second screw holes. A long annular reinforcing rib is welded on the middle and lower sections of the supporting leg and connecting pieces are welded at the middle and lower sections on the inner side of the supporting feet.

The present disclosure provides a highly steady rotary chair, and relates to the technical field of rotary chairs, which solves the technical problems that in the rotary chair in the prior art, a fully-welded base plate causes a product to have an extremely large packaging volume and higher production and sales cost. The highly steady rotary chair includes a rotary chair body and a rotary chair base. The rotary chair base includes a bottom ring, a supporting rod, a rotating shaft tray, a rotating shaft, a rotating shaft connector, and a chair seat connecting steel plate which are detachably connected in sequence from bottom to top; and the rotary chair body and the rotary chair base are detachably connected through the chair seat connecting steel plate. The present disclosure is used to provide the highly steady rotary chair with a detachable base plate and has the advantages of reducing the packaging cost and improving the product loading capacity.

The present disclosure provides a highly steady rotary chair, and relates to the technical field of rotary chairs, which solves the technical problems that in the rotary chair in the prior art, a fully-welded base plate causes a product to have an extremely large packaging volume and higher production and sales cost. The highly steady rotary chair includes a rotary chair body and a rotary chair base. The rotary chair base includes a bottom ring, a supporting rod, a rotating shaft tray, a rotating shaft, a rotating shaft connector, and a chair seat connecting steel plate which are detachably connected in sequence from bottom to top; and the rotary chair body and the rotary chair base are detachably connected through the chair seat connecting steel plate. The present disclosure is used to provide the highly steady rotary chair with a detachable base plate and has the advantages of reducing the packaging cost and improving the product loading capacity.

The present disclosure provides a highly steady rotary chair, and relates to the technical field of rotary chairs, which solves the technical problems that in the rotary chair in the prior art, a fully-welded base plate causes a product to have an extremely large packaging volume and higher production and sales cost. The highly steady rotary chair includes a rotary chair body and a rotary chair base. The rotary chair base includes a bottom ring, a supporting rod, a rotating shaft tray, a rotating shaft, a rotating shaft connector, and a chair seat connecting steel plate which are detachably connected in sequence from bottom to top; and the rotary chair body and the rotary chair base are detachably connected through the chair seat connecting steel plate. The present disclosure is used to provide the highly steady rotary chair with a detachable base plate and has the advantages of reducing the packaging cost and improving the product loading capacity.

The present disclosure provides a highly steady rotary chair, and relates to the technical field of rotary chairs, which solves the technical problems that in the rotary chair in the prior art, a fully-welded base plate causes a product to have an extremely large packaging volume and higher production and sales cost. The highly steady rotary chair includes a rotary chair body and a rotary chair base. The rotary chair base includes a bottom ring, a supporting rod, a rotating shaft tray, a rotating shaft, a rotating shaft connector, and a chair seat connecting steel plate which are detachably connected in sequence from bottom to top; and the rotary chair body and the rotary chair base are detachably connected through the chair seat connecting steel plate. The present disclosure is used to provide the highly steady rotary chair with a detachable base plate and has the advantages of reducing the packaging cost and improving the product loading capacity.

Embodiments provide a seat connecting device with an adjustable backrest, belonging to the technical field of swivel chairs. In the embodiments, the seat connecting device includes a seat back tightness control assembly including a control handle, a universal joint, a transmission rod, a first bevel gear, a second bevel gear, a lifting part, a mounting seat of the lifting part, and a tightness adjust rod.