| 摘要 |
PROBLEM TO BE SOLVED: To provide a board case for game machines with a sealing mechanism which makes sealing screws harder to loosen. SOLUTION: The board case 1 which houses a control board 14 for game machines between a base member 2 and a cover member 3 has a sealing mechanism 4a which is so arranged as to unremovably seal up the base member 2 and the cover member 3 plural times with sealing screws 5 while the sealing is released only by cutting away the sealing mechanism 4a. The sealing screws 5 have male thread parts 5a to be threadedly engaged with base seat parts 2c formed on the base member 2 from the side of the cover base seat parts 3c formed on the cover member 3, flange parts 5b respectively provided on the upper parts of the male thread parts 5a and bolt parts 5c which stick upward respectively from the flange parts 5b and having male threads on respective outer peripheral surfaces. One way nuts 6 are arranged which are threadedly engaged with the bolt parts 5c and have one way grooves 6b which are engaged with the tip of a tool when it is inserted into the groove and turned in the direction of tightening while being taken off the tip of the tool without being engaged with it when the tool is turned in the direction of loosening. COPYRIGHT: (C)2008,JPO&INPIT
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