Title:
CYLINDRICAL FORM
Document Type and Number:
Japanese Patent JP3730937
Kind Code:
B
Abstract:
PROBLEM TO BE SOLVED: To provide a cylindrical form which facilitates formation of a cylindrical hole at the time of placing concrete, and is produced at a low cost.
SOLUTION: The form is for use in placing concrete, and consists of a main form body 1, and a cover member 2 covering at least the peripheral surface of the main form body 1. The main form body 1 is a closed-end cylinder and has a spiral protrusion 3 on the periphery thereof. The cover member 2 is formed of a double-layered synthetic resin sheet 7 with air sealed therein, and formed into a cylinder having a thickness sufficient for insertion of the main form body 1 therein. Further, the height of the protrusion 3 formed on the periphery of the main form body 1 is set to a value smaller than the thickness of the sheet 7.
Inventors:
Kato, Masuo
Kato, Fumihiko
Kato, Fumihiko
Application Number:
JP2002000166278
Publication Date:
October 14, 2005
Filing Date:
June 06, 2002
Export Citation:
Assignee:
Kato, Masuo
International Classes:
E04G15/04; E04G15/06; E04G15/00; (IPC1-7): E04G15/06