| 摘要 |
Arm rests 17a, 17b, 17c, and interconnection bars 224a, 24b, 24c, 24d are swung upward with respect to handle pipes 15a, 15b, 15c to thereby fold front leg 12a and a rear leg 14a to be substantially parallel with each other. At least one joint 16a1, 16b1, 22a2, 22b1, 23a2, 23b1, 25a2, 25b1, are provided on one axial line, on the middle portion of each of both sides of a push handle 16 with respect to the interconnection of the intermediate handle pipe 15b with the push handle 16, on the middle portion of each of front interconnection bars 22a, 22b interconnecting the intermediate front leg 12b and the left and right front legs 12a, 12c, on the middle portion of each of rear interconnection bars 23a, 23b interconnecting the intermediate rear leg 14b and the left and right rear legs 14a, 14b, and on the middle portion of each of upper interconnection bars 25a, 25b interconnecting the intermediate interconnection bars 24</
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