| 摘要 |
In order to provide an inflator including a piston which can reliably break a burst disk (sealing plate) with a small force, an inflator (1) according to the present invention includes a piston (13) which is two-forked at an end thereof and is provided with two cutting edges (35). The cutting edges (35) of the piston (13) come into contact with portions of a sealing plate (5) which swells toward the piston (13) side by being pushed by a high-pressure gas stored in a bottle (3), the portions being offset from the vertex of the swelling sealing plate (5). Each cutting edge (35) is tapered at the outer side thereof (the side away from the vertex of the sealing plate), and the tip of the cutting edge is thereby positioned at the inner side of the periphery of the piston (13). The angle formed between the axis of each cutting edge (35) and the surface of the sealing plate (5) is increased. Therefore, the cutting edges (35) can smoothly cut into the swelling sealing plate (5). Deformation of the cutting edges (35) toward the outside and slip thereof along the spherical surface can be suppressed. <IMAGE> |
