US Patent 10149520 Attachment device

An attachment device is provided for two elements of a watch band to allow the two elements to be hooked into place or unhooked. The first element includes at least one bar on one of its ends. The second element includes two grooves, each including a longitudinal opening respectively opposite one another, and one of the two elements can move from an unhooked position. One of the elements is oriented in a predetermined angular position in relation to the other element, to a hooked position, in which the two elements are coplanar after a rotation of a predetermined angle of one of the two elements in relation to the other so that each groove is articulated on the bar to hold the two elements hooked to one another.