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Title:
APPARATUS AND METHOD FOR PRODUCING CONCRETE PRODUCT HAVING THROUGH-HOLE
Document Type and Number:
Japanese Patent JP3599434
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To easily and precisely produce a concrete product having a through- hole.
SOLUTION: An apparatus 1 for producing a concrete product having a through-hole is constituted of an outer form 5 having demolding holes 6 (6A, 6B) opened to both mutually opposed side surface parts thereof and the inner form 10 of a concrete product incorporated in the outer form 5 from the demolding holes 6 to form the through-hole to the concrete product. The inner form 10 is constituted of an inner peripheral tube member having a hollow part in its innermost peripheral part, the valve 18 filling the hollow part of the inner peripheral tube member with gas, the elastomer attached to the outer periphery of the inner peripheral tube body so as to be freely expanded and contracted and the outer peripheral member attached to the outer periphery of the elastomer.


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Inventors:
Nakaya Parent
Application Number:
JP19975895A
Publication Date:
December 08, 2004
Filing Date:
August 04, 1995
Export Citation:
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Assignee:
Nakaya Parent
International Classes:
B28B7/18; B28B7/32; B28B21/20; B28B21/88; (IPC1-7): B28B21/20; B28B7/18; B28B7/32; B28B21/88
Domestic Patent References:
JP6193257A
JP61155108U
JP59190814A
JP60150011U
JP4130813U
Attorney, Agent or Firm:
Akira Koike
Eiichi Tamura
Seiji Iga



 
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