| 摘要 |
PROBLEM TO BE SOLVED: To automate the attaching/detaching work or a pin for forming a through-hole in a concrete molding and the opening/closing work of movable molds. SOLUTION: The pin 7 for forming the through-hole 6 is assembled at the bottom mold 2 of a form 1. A shaft 15 is fixed to the lower end of the pin 7, and an engaging shaft 25 is provided through the shaft 15. An engaging groove 30 is formed on a moving member 20, and the engaging shaft 25 of the shaft 15 is engaged with the groove 30. The pin 7 is simultaneously lowered from the member 20 by reciprocating a cylinder 24, and the pin 7 is drawn from the hole 6. Simultaneously, the movable molds 3, 4 are pressed out by the contact of the member 20, and the molds 3, 4 are separated from an arch- like block 5.
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