| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems that in a conventional art where a sealing screw, while a screwdriver runs idle in a loosening direction, is used to connect a box base of the board box to its box cover, pushing-rotating the screwdriver with a strong force causes a chance of the sealing screw being dislocated. SOLUTION: The box base 1a is covered by the box cover 1b in the board box 1. The means for sealing the board box 1 has the following requirements (1)-(4): the box cover 1b is screwed by the sealing screw 12 (1); a fixed and ball holder (5) is protrusively provided so as to surround the periphery of the head of the screw 12 (2); the holder 5 has a size large enough to enter in for a Pachinko ball B and a structure in which the ball B entering in one time remains fitting not to be drawn (3); the ball B is fit in the holder 5 to block the head of the screw 12 (4). COPYRIGHT: (C)2009,JPO&INPIT
|
