Pneumatic door closer
AssigneeCmech (Guangzhou) Ltd.
InventorFan Shui Wang
Life of this patent
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Abstract
A pneumatic door closer includes a rotary energy-storing mechanism including a housing and a driving mechanism. The driving mechanism includes a cylinder, a second piston assembly and a sealing element, the sealing element is in an air tight connection with the cylinder and the second piston assembly, to form a closed space filled with high pressure gas in the cylinder. The second piston assembly drives the closed space into a first air chamber and a second air chamber in communication with each other. The driving mechanism also includes a first piston assembly connected to the second piston assembly. The pneumatic door closer also includes a transmission mechanism having one end received in the housing and another end connected to the door frame.
Claims15
A pneumatic door closer for a door pivotally mounted in a door frame, comprising:
- a guide track on the door frame;
- first and second piston assemblies on the door;
- a rod having a first end slidably mounted in the guide track and a second end attached to the first piston assembly;
- the first piston assembly having a first piston;
- the second piston assembly having a second piston with first and second gas chambers on opposite sides of the second piston;
- the first and second pistons moving in unison when the door opens and closes;
- a first passage between the first and second gas chambers to allow gas flow from the second chamber to the first chamber when the door is opening;
- and
- a second passage between the first and second gas chambers to allow gas flow from the first chamber to the second chamber when the door is closing so as to dampen door closing.
A method of dampening closing movement of a door pivotally mounted in a door frame, comprising:
- connecting a rod to a track in the door frame and to a pneumatic closer on the door;
- directing gas from a first gas chamber in the pneumatic closer to the second gas chamber in the pneumatic closer when the door is closing.
Dependencies are inferred from the claim text.