| 摘要 |
<p>A bag includes support pipes 5 coupled to a base 1, a seat 31 coupled to the pipes 5, seat stoppers 37, foldable legs 32 coupled to the seat 31, a first link 33 having one end coupled to the middle of the legs 32 and another end coupled to the seat 31, and second links 34 each of which having one end coupled to the middle of the leg 32 and another end coupled to the base 1. The seat 31 can be folded in the vertical orientation. The seat 31 can be held in the horizontal orientation by the first link 33 and the legs 32. The first and second links 33 and 34 are coupled by elastic rods 39. When the second links 34 swing, the rods 39 move the one end of the first link 33 along the seat 31.
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