| 摘要 |
PROBLEM TO BE SOLVED: To break a cylindrical simplified mold and take a test piece therefrom while preventing a worker from getting a hurt, enabling the worker to carry out the work easily even in the case the worker is not an expert and preventing the test piece to be molded from suffering damages, when the simplified mold is broken by using a cutter after concrete solidification in such a process that the test piece made of concrete is produced by using the cylindrical simplified mold being composed of a heavy paper, a resin, a metal (foil) or the like. SOLUTION: An opening device 1 which opens a cylindrical section of a container 20 where the cylindrical section 21 is disposed in at least its portion, is provided with a cylindrical opening device body 2 which can be held by one hand, and the cutter 10 which projects from an appropriate position in a round inner face of the opening device body in order to cut the container. COPYRIGHT: (C)2004,JPO
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