Stackable folding chair

1. A stackable folding chair comprising:

a seat having a rear edge, a right edge, a left edge and a bottom;

a seat back pivotably attached to the rear edge of the seat such that the seat back is foldable to a position substantially parallel to and on top of the seat;

a pair of front legs, one leg pivotably attached to the right edge of the seat and the other leg pivotably attached to the left edge of the seat; and

a pair of rear legs pivotably attached to the bottom of the seat such that the rear legs are foldable from an extended position to a position substantially parallel to and beneath the seat;

a first armrest pivotably attached to one front leg and pivotably attached to the seat back;

a second armrest pivotably attached to the other front leg and pivotably attached to the seat back;

each of said first and second armrests slidable relative to each of said pair of front legs such that sliding said armrests relative to said front legs pivots the front legs and the seat back relative to said seat.

2. The stackable folding chair of claim 1 wherein the armrests are configured so that the seat back is locked in only one unfolded position.

3. The stackable folding chair of claim 1 wherein the armrests are configured so that the seat back can be positioned in one of at least two unfolded positions.

4. The stackable folding chair of claim 1 also comprising a wing attached to each front leg, the wing positioned and configured so that when a first stackable folding chair is stacked on a second stackable folding chair, each wing on the first chair will rest upon an armrest of the second chair.

5. The stackable folding chair of claim 1 also comprising a rib attached to each front leg and wherein the armrests each have a slot, the ribs and slots sized and positioned so that when a first stackable folding chair is stacked on a second stackable folding chair each rib will fit within the slot of an armrest of the second chair.

6. The stackable folding chair of claim 1 also comprising reinforcing bars attached to the bottom of the seat.

7. The stackable folding chair of claim 1 wherein the seat, seat back, front legs and rear legs are plastic.

8. The stackable folding chair of claim 7 wherein the plastic is selected from the group consisting of polypropylene, polyvinyl chloride, polycarbonate and ABS.

9. The stackable folding chair of claim 7 wherein at least a portion of the plastic is reinforced plastic.

10. A stackable folding chair comprising:

a seat having a left edge and a right edge, a rear edge and a bottom;

a seat back pivotably attached to the rear edge of the seat;

a pair of front legs, one leg attached to the left edge of the seat, and the other attached to the right edge;

a pair of rear legs pivotably attached to the bottom of the seat such that the rear legs are pivotable from an extended position to a folded position;

the seat, seat back, front legs and rear legs positioned and configured to enable the chair to be stacked upon one another with the rear legs pivoted to the folded position such that each chair so stacked is nested within another chair;

each of the front legs pivotably attached to respective right and left edges of the seat;

a first armrest pivotably attached to one front leg and pivotably to the seat back;

a second armrest pivotably attached other front leg and pivotably attached to the seat back;

each of said first and second armrests slidable relative to each of said pair of front legs such that sliding said armrests relative to said front legs pivots the front legs and the seat back relative to said seat; and

each of said first and second armrests, the seat, seat back, front legs and rear legs positioned and configured to enable the chair to be stacked upon one another with the rear legs pivoted to the folded position such that each chair so stacked is nested within another chair.

11. A stackable folding chair comprising:

a seat having a left edge and a right edge, a rear edge and a bottom;

a seat back pivotably attached to the rear edge of the seat;

a pair of front legs, one leg attached to the left edge of the seat, and the other attached to the right edge;

a pair of rear legs pivotably attached to the bottom of the seat such that the rear legs are pivotable from an extended position to a folded position;

the seat, seat back, front legs and rear legs positioned and configured to enable the chair to be stacked upon one another with the rear legs pivoted to the folded position such that each chair so stacked is nested within another chair; and

a wing attached to each front leg, the wing positioned and configured so that when a first stackable folding chair is stacked on a second stackable folding chair, each wing on the first chair will rest upon an armrest of the second chair.

12. A stackable folding chair comprising:

a seat having a left edge and a right edge, a rear edge and a bottom;

a seat back pivotably attached to the rear edge of the seat;

a pair of front legs, one leg attached to the left edge of the seat, and the other attached to the right edge;

a pair of rear legs pivotably attached to the bottom of the seat such that the rear legs are pivotable from an extended position to a folded position;

the seat, seat back, front legs and rear legs positioned and configured to enable the chair to be stacked upon one another with the rear legs pivoted to the folded position such that each chair so stacked is nested within another chair; and

a rib attached to each front leg and wherein the armrests each have a slot, the ribs and slots sized and positioned so that when a first stackable folding chair is stacked on a second stackable folding chair each rib will fit within the slot of an armrest of the second chair.