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patent door closer

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2022
DATE
03 - 09
How to install the door closer?
The most commonly used door closers are external closers, which are installed in the following ways.Here is the content list:Door closer installation methodsDoor closer installation stepsDoor closer installation methodsDoor closers are generally divided into 3 types of installation Option A - Regula
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2022
DATE
03 - 02
Common problems and maintenance methods of door closers
Sometimes after a period of operation of the door closer will have some problems, so when there is a problem we should how to repair it? The following is a detailed introduction.Here is the content list: The usage and maintenance of door closersCommon problems1) Loose or missing mounting screws, r
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2022
DATE
02 - 25
What are the types of door closers?
Modern hydraulic door closers (door closers for short) began with a patent registered by the Americans within the early twentieth century, that differs from ancient doors nearer by resistance the liquid within the door closer to realize a padding impact. The core of the look plan of hydraulic door n
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2022
DATE
02 - 23
How to choose door closers correctly?
Door closer products must meet the national standard GB2698-2005, fire door closers should also meet the requirements of GA93-1995 "fire door closers test". So what factors should be considered when choosing a door closer? The following is a detailed introduction.Here is the content list:The width a
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2022
DATE
02 - 16
Introduction to door closer
Automatic door closer may be a spring-like hydraulic device on the top of the door, once the door is opened is often discharged by compression, the door can mechanically shut, there is like a spring door role, can ensure that the door is opened, accurate and timely close to the initial position. So
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2021
DATE
08 - 26
Congratulations to Oubao Company for its successful listing on the " New OTC Market”
On August 26, 2021, Oubao Security Technology Co., Ltd., referred to as "Oubao Shares", was officially listed on the National Equities Exchange and Quotations System, stock code 873601. Oubao Security Technology Co., Ltd. was established in Lishui in 2007. Its predecessor, Wenzhou Oubao Hardware Co
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