FIELD: door closing devices with spring, other than torsion spring and a piston.
SUBSTANCE: door closer comprises eccentric gear wheel with round rolling curve. The gear wheel engages rack of piston. Particular rolling curve shape of gear wheel teeth conforms to gear wheel ring. Door closing operation is divided into four braking stages. Each stage is operated by control valves.
EFFECT: increased efficiency, provision of optimal characteristics of piston movement inside door closer body due to improved door braking.
12 cl, 11 dwg
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