| 摘要 |
PURPOSE: A pneumatic door closer is provided to correctly operate without considering temperature, to prevent trouble according to immoderate operation and to reduce a cost. CONSTITUTION: A pneumatic door closer comprises a door(2) having a cylinder body(6); a cylinder(4) mounted in the cylinder body; pistons(42,44) sliding front and back in the cylinder; and a pressure spring(10) pressurizing the piston frontward. The piston composed of a rear piston pressurized through the pressure spring by forming a rack gear(8) on a side and a front piston elastically connected to the rear piston. A first buffer spring(52) is installed between the rear and front pistons to buffer. The pneumatic door closer uses air to control traveling speed of the pistons. Thereby, the pneumatic door closer actuates without considering temperature by the air not changing viscosity, and prevents oil leakage and environmental pollution.
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