扣位提供了一种不但方便快捷而且经济的产品装配方法，因为扣位的组合部份在生产成品的时候同时成型，装配时无须配合其他如螺丝、介子等紧锁配件，只要需组合的两边扣位互相配合扣上即可。 扣位的设计虽可有多种几何形状，但其操作原理大致相同：当两件零件扣上时，其中一件零件的勾形伸出部份被相接零件的击缘部份推开，直至击缘部份完结为止；及後，藉着塑胶的弹性，勾形伸出部份即时复位，其後面的凹槽亦即时被相接零件的击缘部份嵌入，此倒扣位置立时形成互相扣着的状态。
　　Buckle a not only provides a convenient and economic method of product assembly, because of a combination of parts in the production of finished products at the same time when molding, assembly time do not need to coordinate with other lock accessories, such as screws, meson, as long as to combination button on both sides of a cooperate with each other. Although buckle a design can have a variety of geometric shape, but its operation principle are roughly the same: when the buckle two parts, one part of the cusp out part of the edge part by following parts shot away, until end strike edge part; And after, through the elastic and plastic cusp out instant reset, followed by the grooves or when the following parts of edge part embedded invert the position and form of locking status with each other.