| 摘要 |
PROBLEM TO BE SOLVED: To provide a door closer capable of easily adjusting the door opening and closing speed. SOLUTION: This door closer is formed of a main shaft 6 fitted to a main body freely to be rotated, a spring 7 for rotating the main shaft 6, and a piston mechanism 8 for controlling the rotating speed of the main shaft. Pitch of a screw of a screw rod 89 for moving a moving material 88 of the piston mechanism 8 is formed at 0.6 mm or less.
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