| 摘要 |
<p>PURPOSE:To bear a pressing force of a torsion spring at whatever the thickness of a detaining part of a shutter opening and closing member is thin by bending a detaining end of the torsion coil spring on the side of the shutter opening and closing member at an approximately right angle and abutting it against the detaining part of the shutter opening and losing member. CONSTITUTION:The torsion coil spring 11 is bent on its one end at an approximately right angle, and the approximately-right-angled-bent end part is detained with a shutter opening means 9, while the other end of the torsion coil spring 11 is detained with a case 6, so that a shutter 3 is always energized to open a head window 2. Consequently, no matter how thin the thickness of the detaining part of the shutter opening means 9 is, the detaining part of the shutter opening means 9 can be pressed by the approximately-right-angled-bent end part of the torsion coil spring 11.</p> |
