| 摘要 |
A seat has a surface portion (12) and an abutment portion (30) which is moveable out of the seat portion (12) by a spring biasing mechanism (40). The mechanism (40) includes rod (44) and locking pin (57) which can lock the rod (44) in position to hold the abutment portion (30) in a predetermined position. Seat mounting mechanisms are also disclosed which include clamp assemblies which have quick release compression cam fasteners (328, 382) for locking a seat in a desired position relative to the mounting mechanisms. Other mounting mechanisms include spring arrangements (411, 405) for biasing a seat forward and locking mechanisms (420) may be included for locking the seat in a predetermined position. One seat mounting includes an arcuate guide sleeve (506) which moves relative to a block (501) so the seat (500) can be moved along an arcuate guide path. Another mounting includes post segments (576) and (577) which are pivotally connected together and bias by a spring (587) into certain disposition. A compression lock (584) is provided for locking the segments (575, 577) together. Another seat embodiment the invention includes spring metal seat portion (804) which flex and conform to a user's anatomy depending on the shape of the anatomy and load applied. Support members are also provided which include a plurality of elements (610) which are biased by spring and rod assemblies (656) to place the elements in predetermined positions.
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