jialissa: Door Closers - The Various Forms and Their Role in Fireplace Security
Door Closers - The Various Forms and Their Role in Fireplace Security
During forensic evaluation dust and other toxins related to the production process have already been observed in the chambers of some foreign closers which have malfunctioned. Still another important aspect of installation pertains to the competency of the installer. It is needed that most screws and screws have holes pre-drilled and are utilized using the appropriate size and message tap to assure that the screws used for keeping both the closer and the supply be precisely attached to the door and frame.
Some manufacturers have furnished self drilling screws for this application, but it has also been my experience that the self tapping screws do not work as well as a manually tapped thread for long term attachment. Door closers can have significant weight, and therefore, it is essential that they are properly installed. I have seen several cases where the closer simply fell off of the door, striking a user in the head, shoulders, and hydraulic door closer.
While a good quality closer body usually weighs around five pounds, some closers weigh as much as fifteen to twenty pounds depending on their function, and are often installed eight to ten feet off of the ground. When an average user is struck on the head, that fall can equal forces far in excess of the actual weight of the closer alone.
Remember that basic physics says force is equal to mass times acceleration. Falling door closers can lead to serious significant injuries. In at least one case where I was retained as the expert witness, a fallen closer lead to the death of an elderly individual. Proper attachment of the closer body and arm also play a key role in determining closer related injuries.
The actual sub surface point of attachment that the closer and arm must mount to are sometimes undersized or do not have the structural integrity that is required to tolerate the forces exerted by the door closer. While it may not seem important to the average user, a lack of firm and positive attachment of the door closer body and arm often lead to jerky or staccato operation of a door.
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