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Double action spring hinge
Double acting spring hinges are adjustable and execute closing action from either direction. A double tubed door hinge for automatically closing a door comprises a two-tube base,a pair of torsion springs disposed to respective tubes therein and urged at two ends by a pair of first twisting members and a pair of second twisting members,and retained by a pair of lug members and a pair of axle rods. JYI-HSING`s spring hinges have been approved by the New York City Housing Authority (NYCHA) and patented in Taiwan,China and The U.S..The foolproof locking device for spring hinges we developed meets U.S. Federal specification FF-HH-116C (the top button on the hinge is not removable,so that the spring cannot be removed or tampered with)and makes our hinges ideal for use at home,in factories and especially in public buildings.In addition,we also improved the hinge`s annular sleeve and splitting small tube so that the door hinge is durable and provides a smooth operation without causing any noise. (the tension adjustment stand is made of reinforced plastic material). The models of JYI-HSING`s double acting spring hinge are available for doors with and without hanging strips.Finishes for models JHS-070 with no hanging strip are zinc plate,sprayed brass and prime coat,with the lighter nits also available in sprayed aluminum.The hanging strip model JHS-875 is sprayed brass finished. more detail pls access to www.jyihsing.com
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