| 摘要 |
A support frame having a first end frame portion having an apex, a second end frame portion having an apex and spaced laterally from the first frame portion, and a ground-engaging portion coupled to each of the end frame portions is disclosed. A plurality of resilient members connect a seat to the frame, each running from the seat to a point on one of the end frame portions below the apex. The seat is suspended from the end frame portions.
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