Abstract: A folding knife unit particularly for the attachment to wearing apparel. A base plate of the unit can be provided with elements for securing the base plate to the apparel, these elements usually being on the rear surface of the base plate. The front surface of the base or base plate is provided with a headed stud in one embodiment to engage a notch in one end of the folding knife, and a second stud to pass through an aperture in one side plate of the knife and an aligned aperture in the closest knife blade. The second stud is provided with an annular recess, and the action of the backspring causes the knife blade to releasibly engage that recess whereby the knife is releasibly secured to the base plate. In another embodiment, a spring clip engages one end of a side plate rather than the headed stud.

Abstract: A folding pocket knife which can be readily disassembled for cleaning and blade replacement. The pocket knife comprises a case having first and further cooperating case members. A blade is pivotally mounted at one end portion of the case on a pivot pin which assists in securing the case members together. A spring assembly serves to secure the portions of the case members opposite the case end carrying the blade and applies biasing forces to the blade tang which assists in maintaining the blade in its opened or closed position after being moved to one of such positions by an operator.