A range of radii from a bubble radius of 0 mm to a maximum bubble radius is divided into 20 radius sections r.sub.1 to r.sub.20. Bubble volume rates are calculated by dividing a product of the number of bubbles having a radius r and a volume of the bubbles having the radius r by a volume of all the bubbles, and the bubble volume rates are integrated for each radius section r.sub.n. Integrated values thus obtained are plotted on the respective radius sections r.sub.n, thereby obtaining a scatter diagram. A first approximate straight line obtained from plots of a first bubble group in the scatter diagram and a second approximate straight line obtained from plots of a second bubble group have different slopes. A sum of bubble volume rates of the bubbles forming the second bubble group ranges from 10% to 80% of a whole bubble volume rate.

An upholstered recliner, a frame including a pair blow molded hollow arm rest forms. Further components may be blow molded such as a back rest. The arm rest forms and backrest forms may be reinforced with metal plates and assembled into a recliner. The backrest form may have legs with kd brackets secured thereto by clamping onto the portions of the legs of the backrest forms. The connections to the backrest form and arm rest forms providing a geometrically rigid and robust frame that is weighs less, is quicker to assemble, and is more robust that conventional wood frame recliners.

An office-type chair includes a back support having a support frame, front and rear shells, a cushion and a cover. The perimeter edge of the cover wraps around the side of the cushion and the front shell and is inserted between the front and rear shells to form a finished edge for the cover. The front shell may include a central flex section, and a lumbar pad may be positioned between the front shell and the rear shell and adjacent to the central flex section. One or more lumbar enhancement ribs on the front shell may augment the pressure distribution of the lumbar pad as it is vertically adjusted.

An office-type chair includes a back support having a support frame, front and rear shells, a cushion and a cover. The perimeter edge of the cover wraps around the side of the cushion and the front shell and is inserted between the front and rear shells to form a finished edge for the cover. The front shell may include a central flex section, and a lumbar pad may be positioned between the front shell and the rear shell and adjacent to the central flex section. One or more lumbar enhancement ribs on the front shell may augment the pressure distribution of the lumbar pad as it is vertically adjusted.

A seating configuration is described. The seating configuration includes a first support surface configured to support the Ischial Tuberosities of a user. The first support surface includes a feature to urge a user into an optimal position on the seat. The seating configuration includes a second support surface positioned adjacent a pelvic-sacral-lumbar region of the user. The seating configuration includes a third support surface positioned adjacent a thoracic-cervical region of the user. The first, second, and third support surfaces, respectively, together can be configured to create a natural alignment of a spinal column of the user.

A seating configuration is described. The seating configuration includes a first support surface configured to support the Ischial Tuberosities of a user. The first support surface includes a feature to urge a user into an optimal position on the seat. The seating configuration includes a second support surface positioned adjacent a pelvic-sacral-lumbar region of the user. The seating configuration includes a third support surface positioned adjacent a thoracic-cervical region of the user. The first, second, and third support surfaces, respectively, together can be configured to create a natural alignment of a spinal column of the user.

A seat pad (110) is a seat pad made of polyurethane foam obtained from a composition containing a polyol and an isocyanate. The seat pad (110) has a compression deflection coefficient of 2.8 or less as measured in accordance with JIS K6400-2 (2012 version) Method E.

A seat pad (110) is a seat pad made of polyurethane foam obtained from a composition containing a polyol and an isocyanate. The seat pad (110) has a compression deflection coefficient of 2.8 or less as measured in accordance with JIS K6400-2 (2012 version) Method E.

A seat pad includes: a pad body including an air flow passage; a duct configured to form an inner peripheral wall of the air flow passage; and a flow passage cover configured to cover the air flow passage. The duct and the flow passage cover are configured to be foamed and molded integrally with the pad body. The flow passage cover has a cover bent portion bent toward a seat front side to form a recess capable of receiving a bank portion that protrudes from the molding surface. The duct includes a seat surface portion extending along a region of the pad back surface which is outside the air flow passage, and with respect to the flow passage cover, the seat surface portion is configured to be brought into contact with a protruding tip end of the cover bent portion to form a gap.

A seat pad includes: a pad body including an air flow passage; a duct configured to form an inner peripheral wall of the air flow passage; and a flow passage cover configured to cover the air flow passage. The duct and the flow passage cover are configured to be foamed and molded integrally with the pad body. The flow passage cover has a cover bent portion bent toward a seat front side to form a recess capable of receiving a bank portion that protrudes from the molding surface. The duct includes a seat surface portion extending along a region of the pad back surface which is outside the air flow passage, and with respect to the flow passage cover, the seat surface portion is configured to be brought into contact with a protruding tip end of the cover bent portion to form a gap.