| 摘要 |
PROBLEM TO BE SOLVED: To make a holding mechanism for holding a side fence in a state of projecting over the bottom also usable as a means restricting the side fence in a housed state under the bottom. SOLUTION: Lock receivers 18 and 19 engaging an engaging bar constituting a locking unit are formed in the neighborhood of the upper end part and the lower end part side of a second stay 8 constituting a strut part. Only by the operation of lifting the strut part and a fence part 5 over a back bottom, the tip of the engaging bar of the locking unit passes through the guide part of the receiver 18 against spring force to be engaged with an engaging hole to be locked. On the contrary, in order to unlock the locked state, the operation lever of the lock unit is operated to detach the engaging bar from the engaging hole of the receiver 18. On the other hand, only by the up/down operation of the strut part and the fence part, the engaging bar of the locking unit is made to move beyond a weir partitioning the guide part of the receiver 19 and the engaging hole to be in a locked state or an unlocked state.
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