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Spring hinge uses a spring mounted in a hinge and is integral to its design. The spring can be either visible or hidden within a tube and can be found more commonly on interior doors. When used on doors that open both ways they are known as double action spring hinges. Self-closing hinges are an alternative to using a door closer.
This hinge pivots in openings in the floor and the top of the door frame. Also referred to as double-acting floor hinges, they are found in ancient dry stone buildings and, rarely, in old wooden buildings. They are a low-cost alternative for use with lightweight doors. [7] Doors with these hinges may be called haar-hung doors. Self-closing hinge
A single piece of material is used for the top and bottom with a "living hinge" that is integral to the material, rather than added separately. Folding cartons made of paperboard or molded pulp can also be of a clamshell shape. [4] It can also be made of cellulose fiber such as sugarcane-bagasse, wheatstraw, wood pulp, etc.
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A laser cut plywood box with two living hinges. A variant on the kerf bend can be used to create living hinges in laser cut wood. The technique is popular for making light-duty hinges with large radii. [7] It is also possible to create a living wood joint by hand, but the result is less accurate. [8]
Closures need a means of attaching to the container with sufficient security. Threads, lugs, hinges, locks, adhesives, etc. are used. Many plastic closures are made by injection molding. [6] Many closures need to have the ability to adjust to slight manufacturing variation in the container and the closure structure.