Combination hydraulic and pneumatic door closer

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United States of America Patent

PATENT NO 9920561
SERIAL NO

15335002

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Importance

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Abstract

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A door closer capable of adjusting door closing speed, includes a pneumatic cylinder on the door frame, a hydraulic cylinder on the door, and a lever. One end of the lever is movably connected to the pneumatic cylinder, and the other end is connected to the hydraulic cylinder. The pneumatic cylinder includes a sliding rail, and a sliding member cooperated with the sliding rail. A hermetic chamber is formed by the sliding member and the sliding rail. An adjusting valve, for adjusting the air exhaust of the hermetic chamber, is provided on a wall of the hermetic chamber.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
CMECH (GUANGZHOU) LTDNO 388 FENGHUANG ROAD ZHONGXIN TOWN ZENGCHENG GUANGZHOU GUANGDONG 511365 GUANGZHOU CITY GUANGDONG PROVINCE 511365

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fan, Shuiwang Guangzhou, CN 2 27

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