Variable-pressure lumbar and back support cushion

A cushion for enhancing support of a person resting upon an underlying sitting support structure, the cushion comprising in combination:

• a seat portion;
• said seat portion having at least one air filled chamber between a top wall and a bottom wall;
• a back portion;
• said back portion having at least two air filled chambers between a front wall and a back wall, including a first chamber defined by a sacral/lumbar/kidney space above a second chamber defined by a sacral/hip space and at least partially positioned and configured to allow air to flow between said sacral/lumbar/kidney space and said sacral/hip space;
• said back portion joined to said seat portion at a rear side of said seat portion and a lower end of said back portion;
• means to fill and control level of fill within said back portion;
• wherein a sacral back hinge is provided joining said front wall and said back wall of said back portion together between said sacral/lumbar/kidney space and said sacral/hip space;
• and
• wherein said sacral back hinge includes two colinear portions spaced apart by a central opening therein, said central opening allowing air to flow between said sacral/lumbar/kidney space and said sacral/hip space.

A cushion for enhancing support of a person resting upon an underlying sitting support structure, the cushion comprising in combination:

• a seat portion:
• said seat portion having at least one air filled chamber between a top wall and a bottom wall;
• a back portion;
• said back portion having at least two air filled chambers between a front wall and a back wall, including a first chamber defined by a sacral/lumbar/kidney space above a second chamber defined by a sacral/hip space and at least partially positioned and configured to allow air to flow between said sacral/lumbar/kidney space and said sacral/hip space;
• said back portion joined to said seat portion at a rear side of said seat portion and a lower end of said back portion;
• means to fill and control level of fill within said back portion;
• and
• wherein said seat portion includes a plurality of separate chambers separated by weld lines therebetween, said weld lines joined to a perimeter of said seat portion at one end and terminating at strain relief circles at ends of said weld lines most distant from edges of said seat portion, such that chambers between said weld lines are joined together at a back end of said seat portion adjacent said back portion of said cushion.

A back cushion for enhanced back support while sitting, comprising in combination:

• a front wall:
• a rear wall;
• said front wall joined to said rear wall at a perimeter thereof;
• said walls formed of a material that is substantially impermeable to passage of gas between an interior between said front wall and said rear wall and an exterior on sides of said front wall and said rear wall opposite said interior;
• a sacral/hip space defining a portion of said interior between said front wall and said rear wall, said sacral/hip space adapted to support a sacral/hip area on a body of a user;
• a sacral/lumbar/kidney space between said front wall and said rear wall and defining a portion of said interior, said sacral/lumbar/kidney space adapted to support a sacral/lumbar/kidney area of the body of the user;
• said sacral/lumbar/kidney space located above said sacral/hip space;
• an opening between said sacral/lumbar/kidney space and said sacral/hip space allowing air to pass between said sacral/lumbar/kidney space and said sacral/hip space;
• wherein said sacral/lumbar/kidney space is provided as a lower central portion of a larger upper interior space of said back cushion;
• wherein a hinge separates said sacral/hip space from said larger upper interior space of said back cushion;
• and
• wherein said hinge includes two separate co-linear parts with a gap between said two parts, said sacral/lumbar/kidney space located above said hinge and said sacral/hip space located below said hinge.