Chair

Claim 2

A chair seat and back unit comprising an inner shell of rigid material, an outer shell of substantially the same shape as said inner shell, said shells having juxtaposed peripheries with inner portions of the shells being spaced from one another by an air gap, fastening means removably securing the peripheries of said shells at spaced locations, and a rigid mounting plate removably secured to the seat portion of the outer shell, said mounting plate being disposed between said shells, said mounting plate and the seat portion of the outer shell having aligned air holes.

Claim 3

A chair seat and back unit in accordance with claim 1 wherein said mounting plate and outer shell have an enlarged opening in alignment for receiving a foot member on a tilt control mechanism, and a tilt control mechanism secured to said mounting plate by fastening means extending through clearance holes in said outer shell whereby a foot member on said tilt control mechanism projects upwardly into said aligned enlarged openings during use.

Claim 4

A chair seat and back unit in accordance with claim 1 including a base, said base being secured to said mounting plate by fastening means extending through clearance holes in said outer shell.

Claim 5

A chair seat and back unit in accordance with claim 1 including a second rigid plate, said second rigid plate being aligned with said first-mentioned rigid mounting plate, the seat portion of said outer shell being disposed between said rigid plates, and fastening means extending through clearance holes in said outer shell and connecting said plates together with said outer shell having its seat portion clamped between said plates.

Claim 6

A chair in accordance with claim 1 wherein said inner shell has a flat portion on its lower surface which rests on said plate, and said inner shell portion having clearance holes larger than and aligned with threaded mounting holes in said plate.

Claim 7

A chair in accordance with claim 1 including means temporarily maintaining said air holes in alignment during shipment whereby the mounting plate is prevented from shifting with respect to the outer shell.

Claim 8

A chair comprising an inner shell of rigid polymeric plastic material, said shell including an integral seat and back, an outer shell of polymeric plastic material having substantially the same shape as said inner shell, said shell having juxtaposed peripheries with inner portions of the seat and back of the shells being spaced from one another by an air gap, fastening means removably securing only the peripheries of said shells at spaced locations, a rigid mounting plate removably secured to the seat portion of the outer shell and between said shells, said mounting plate and seat portion of the outer shell having aligned holes, a base, fastening means extending from said base to said plate through clearance holes in said outer shell for clamping the seat portion of said outer shell between said base and mounting plate.

Claim 9

A chair comprising an inner shell of rigid polymeric plastic material, said shell including an integral seat and back, an outer shell of polymeric plastic material having substantially the same shape as said inner shell, said shell having juxtaposed peripheries with inner portions of the seat and back of the shells being spaced from one another by an air gap, fastening means removably securing only the peripheries of said shells at spaced locations, a rigid mounting plate removably secured to the seat portion of the outer shell and between said shells, said mounting plate and seat portion of the outer shell having aligned holes, a base, fastening means extending from said base to said plate through clearance holes in said outer shell for clamping the seat portion of said outer shell between said base and mounting plate.

Claim 10

A chair in accordance with claim 7 wherein said inner shell has clearance holes aligned with the last-mentioned fastening means for receiving a portion of the last-mentioned fastening means.

Claim 11

A chair in accordance with claim 7 wherein said mounting plate and seat portion of the outer shell have an enlarged opening through which a portion of a tilt control mechanism extends said base including a tilt control mechanism to facilitate tilting of the shells with respect to a stationary Portion of the base.

Claim 12

A chair in accordance with claim 7 including a second rigid plate aligned with said first mentioned mounting plate, said last mentioned fastening means clamping the seat portion of the outer shell between said plates.

Claim 13

A chair in accordance with claim 7 including arm members in the form of an endless loop, at least one bracket on each arm member, each bracket having a portion extending into the space between the shells, and fastening means securing each bracket to the inner shell.