| 摘要 |
PROBLEM TO BE SOLVED: To open a door in both the directions of the inside and the outside without rattling even when the door is subjected to wind pressure or the like. SOLUTION: The edge of a latch bolt 6 is made triangular in plan, and the member of polypropylene, hard plastic or the like is attached to the edge. A pressure enlarging coil spring 9 is contractedly provided between the rear end face of the latch bolt 6 and the bottom part of a support cylinder 8. A spring housing chamber is formed in the inside of the latch bolt 6, and the edge side of a latch bolt tension rod 11 is slidably inserted in the spring housing chamber. A spring receiver is provided on the edge of the latch bolt tension rod 11, and a pressurizing coil spring 10 of stronger elasticity than the pressurizing coil spring 9 is contracted between the spring receiver and the wall face of the spring housing chamber. A latch bolt fitting recess part 15 making the deepest part 15a a triangle of the same angle as the edge of the latch bolt is provided on the opposite face of the latch bolt of a strike 14. Furthermore, inclination parts 16, 16 introducing the latch bolt to the fitting recess part 15 of the latch bolt are formed on the outside of both of the fitting recess parts of the latch bolt, and rubbers 17, 17 are attached to the inclination parts.
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