| 主权项 |
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, and a retractable seat-bottom support configured to provide means for supporting the foldable seat bottom in the unfolded use position, the retractable seat-bottom support includes a 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, and anchor 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. |
