To prevent easy removal of a case body from a screw by forming on the case body a screw head fixer which has a first stopper provided with first and second inclined portions and a screw part, and a screw leg fixer which has a second stopper provided with first and second inclined portions and a slit.
A screw 2 of a wall 1 is covered with screw head hole 12a of a screw leg fixer 14. When a case body 11 is pressed downward, the screw leg widens a second stopper 18 along a first inclined portion 18a, followed by reception of a wall on the outer side of a slit 19. When the case body 11 is further pushed, the screw leg is engaged with a screw leg hole 12b. The stopper 18 is reset by means of a spring part 17. The screw leg is fixed by a second inclined portion 18b. At the same, time, a screw head fixer 13 is engaged with the screw 2, while the screw head 2a is pressed by an upper part of the fixer 13 by the use of a spring part 15. A first inclined portion 16a of a first stopper part 16 is inclined loosely, and easily moved along the screw head 2a at the time of engagement. A second inclined portion shows steel inclination. It is headly removed after engagement with the screw head 2a.
MATSUURA MASAAKI
IIOKA SHIGEYUKI
