What is the difference between child hinge and ordinary hinge?

The parent hinge is composed of two different sizes of the hinge, it is an extension of the ordinary hinge, with flexible and fast characteristics. What are the advantages of the parent hinge compared with the ordinary hinge? Let's take a look:   From the appearance point of view, the child hinge than the ordinary hinge more than one hinge, making the door and window opening and closing more flexible and convenient.
From the installation point of view, the hinge installation does not need to be slotted, which directly reduces the damage to the door and greatly enhances the beauty of the door. More importantly, now some non-solid wood doors or hollow wood doors, simply can not withstand the slotting, even if the barely slotted installation of ordinary hinge, over time may appear door fall off, door perforation and other serious quality problems, and the unique design of the factor hinge, no grooving direct installation, enhance the integrity and applicability of the door. From these aspects, the parent hinge undoubtedly has the absolute upper hand, the biggest selling point of the parent hinge is easy to use.     In terms of durability, the ordinary hinge is better than the child hinge, because the length of the child hinge and the length of the ordinary hinge are the same, but the inner and outer parts of the factor hinge should be overlapped, making the inner page smaller, while the outer piece is hollowed out, from this point of view, the durability is not as good as the ordinary hinge. In addition, the rotation and bearing of the hinge many times depend on the central ring, the degree of wear resistance of the central ring and the degree of closure of the central shaft directly determines the bearing capacity of the hinge, the ordinary hinge is usually 4 central rings, and the child and the mother are two, from this point of view, it is also the reason for the durability of the child and the mother hinge compared with the ordinary hinge.