摘要 |
PROBLEM TO BE SOLVED: To make a caster carriage have excellent operability with a light structure and to make manufacturing cost inexpensive. SOLUTION: A v-shaped cut-out a and at least a bolt hole b in a holding state of the cut-out a are punched at each of four portions on a roughly one half side along the longitudinal direction of a long, narrow and flat plate 4 of a fixed width. Die forging of fylfot patterns is performed for the one half side, bending is performed so that the open surfaces may be paired with each other at each cut-out a, and thereby a square frame body in which an outward side is surrounded by a standing wall by the remaining parts of the flat plate 4 and the bolt hole b is located within the die-forged recess at the inside is formed, and a caster mounting plate is fixed by a bolt nut means by using the bolt hole b of the square frame body.
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