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A folding chair includes a frame, a seat bottom coupled to the frame, and legs for supporting the seat bottom in a horizontal position relative to the frame. The frame is formed to include a seat back.

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1. A folding chair comprising a frame includes a backrest and first and second rear legs coupled to the backrest and arranged to elevate the backrest above ground under the backrest,a foldable seat bottom mounted on the frame for pivotable movement relative to the frame about a horizontal pivot axis

1. A folding chair comprising a frame includes a backrest and first and second rear legs coupled to the backrest and arranged to elevate the backrest above ground under the backrest,a foldable seat bottom mounted on the frame for pivotable movement relative to the frame about a horizontal pivot axis between a compact folded storage position alongside the backrest and an unfolded use position arranged to extend along a generally horizontal plane away from the frame wherein the backrest is arranged to extend upwardly away from a rear edge of the foldable seat bottom, anda retractable seat-bottom support configured to provide means for supporting the foldable seat bottom in the unfolded use position, the retractable seat-bottom support includesa first gatefold leg unit mounted on the frame for pivotable movement about a first vertical axis between a retracted position alongside the frame and an extended position arranged to lie under and support a first side of the foldable seat bottom upon movement of the foldable seat bottom to the unfolded use position,a second gatefold leg unit mounted on the frame for pivotable movement about a second vertical axis between a retracted position alongside the frame and an extended position arranged to lie under and support an opposite second side of the foldable eat bottom upon movement of the foldable seat bottom to the unfolded use position, andanchor means for selectively coupling the foldable seat bottom in a stationary position on the seat-bottom support after pivotable movement of the first and second gatefold leg units to the extended positions and pivotable movement of the foldable seat bottom to the unfolded use position, wherein the anchor means comprises a first seat-bottom retainer including a first seat-bottom support brace coupled to the first gatefold leg unit to move therewith and arranged to engage and support the foldable seat bottom in the unfolded use position and a first seat-bottom lock including a locking-pin receiver coupled to the foldable seat bottom for movement therewith, a locking-pin carrier coupled to the first gatefold leg unit for movement therewith and formed to include a carrier passageway that is aligned to communicate with a receiver passageway formed in the locking-pin receiver upon movement of the first gatefold leg unit to the extended position and movement of the foldable seat bottom to the unfolded use position, and a locking pin mounted for sliding movement in the carrier passageway between a withdrawn position located outside of the receiver passageway formed in the locking-pin receiver to establish an unlocked condition of the first seat-bottom retainer to free the foldable seat bottom for movement relative to the first gatefold leg unit and an inserted position arranged to extend into the receiver passageway formed in the locking-pin receiver to establish a locked condition of the first seat-bottom retainer to block movement of the foldable seat bottom relative to the first gatefold leg unit and toward the compact folded storage position alongside the backrest,wherein in the compact storage position of the foldable seat bottom and the retracted position of each of the first and second gatefold units, the foldable seat bottom is arranged between the backrest and the first and second gatefold units. 2. The folding chair of claim 1, wherein the anchor means further comprises a second seat-bottom retainer including a second seat-bottom support brace coupled to the second gatefold leg unit to move therewith and arranged to engage and support the foldable seat bottom in the unfolded use position and a second seat-bottom lock including a second locking-pin receiver coupled to the foldable seat bottom for movement therewith, a second locking-pin carrier coupled to the second gatefold leg unit for movement therewith and formed to include a second carrier passageway that is aligned to communicate with a second receiver passageway formed in the second locking-pin receiver upon movement of the second gatefold leg unit to the extended position and movement of the foldable seat bottom to the unfolded use position, and a second locking pin mounted for sliding movement in the second carrier passageway between a withdrawn position located outside of the second receiver passageway formed in the second locking-pin receiver to establish an unlocked condition of the second seat-bottom retainer to free the foldable seat bottom for movement relative to the second gatefold leg unit and an inserted position arranged to extend into the second receiver passageway formed in the second locking-pin receiver to establish a locked condition of the second seat-bottom retainer to block movement of the foldable seat bottom relative to the second gatefold leg unit and toward the compact folded storage position alongside the backrest. 3. The folding chair of claim 1, wherein the foldable seat bottom is configured to provide bench means for seating two people in side-by-side relation between the first and second gate-fold leg units upon movement of the first and second gate-fold leg units to the extended positions and movement of the foldable seat bottom to the unfolded use position. 4. The folding chair of claim 1, wherein the first gatefold leg unit is mounted on the frame by hinged attachment to at least one first mount rail, the at least one first mount rail being rigidly attached to the frame and the hinged attachment defining the first vertical axis. 5. The folding chair of claim 4, wherein the second gatefold leg unit is mounted on the frame by hinged attachment to at least one second mount rail, the at least one second mount rail being rigidly attached to the frame and the hinged attachment defining the second vertical axis. 6. The folding chair of claim 5, wherein each of the at least one first mount rail and the at least one second mount rail has a first end which is coupled to the frame and a second end which extends away from the frame to define the respective first and second vertical axis and each has an extension length defined between the first and second ends, and wherein the extension length of one of the at least one first mount rail and the at least second mount rail is longer than the other. 7. The folding chair of claim 4, wherein the hinged attachment is formed by reception of a free end of the at least one first mount rail into a first mount rail-receiving space defined within exterior portions of first gatefold unit, and wherein each of the free end of the at least one first mount rail and the exterior portions of the first gatefold unit which define the first mount rail-receiving space include a pin bore penetrating therethrough and corresponding to each other to receive a hinged pin when the free end of the at least one first mount rail is arranged within the first mount rail-receiving space. 8. The folding chair of claim 1, wherein the foldable seat bottom includes a link rail rigidly attached thereto and extending outwardly from the foldable seat bottom, the link rail being configured for rotatable connection to the frame. 9. A folding chair comprising a frame includes a backrest and first and second rear legs coupled to the backrest and arranged to elevate the backrest above ground under the backrest,a foldable seat bottom mounted on the frame for pivotable movement relative to the frame about a horizontal pivot axis between a compact folded storage position alongside the backrest and an unfolded use position arranged to extend along a generally horizontal plane away from the frame wherein the backrest is arranged to extend upwardly away from a rear edge of the foldable seat bottom, anda retractable seat-bottom support configured to provide means for supporting the foldable seat bottom in the unfolded use position, the retractable seat-bottom support includesa first gatefold leg unit mounted on the frame for pivotable movement about a first vertical axis between a retracted position alongside the frame and an extended position arranged to lie under and support a first side of the foldable seat bottom upon movement of the foldable seat bottom to the unfolded use position,a second gatefold leg unit mounted on the frame for pivotable movement about a second vertical axis between a retracted position alongside the frame and an extended position arranged to lie under and support an opposite second side of the foldable eat bottom upon movement of the foldable seat bottom to the unfolded use position, anda locking device comprising a first seat-bottom retainer including a first seat-bottom support brace coupled to the first gatefold leg unit to move therewith and arranged to engage and support the foldable seat bottom in the unfolded use position and a first seat-bottom lock including a locking-pin receiver coupled to the foldable seat bottom for movement therewith, a locking-pin carrier coupled to the first seat bottom support brace for movement therewith and formed to include a carrier passageway that is aligned to communicate with a receiver passageway formed in the locking-pin receiver upon movement of the first gatefold leg unit to the extended position and movement of the foldable seat bottom to the unfolded use position, and a locking pin mounted for sliding movement in the carrier passageway between a withdrawn position located outside of the receiver passageway formed in the locking-pin receiver to establish an unlocked condition of the first seat-bottom retainer to free the foldable seat bottom for movement relative to the first gatefold leg unit and an inserted position arranged to extend into the receiver passageway formed in the locking-pin receiver to establish a locked condition of the first seat-bottom retainer to block movement of the foldable seat bottom relative to the first gatefold leg unit and toward the compact folded storage position alongside the backrest,wherein the backrest is connected fixedly to the first and second rear legs.