Patent ID: 9126259
Filing Date: 2015-09-08
Classification: B21D,B21K,B23P,B26B,B26D

Abstract:
1. A method of making a utility knife blade, comprising: providing a utility knife blade body having first and second portions formed of different alloys and an approximately trapezoidal shape defined by a first edge, a second edge, a third edge located on an opposite side of the utility knife blade relative to the second edge, and a fourth edge located on an opposite side of the utility knife blade relative to the first edge; providing the first edge with at least one notch therein; and providing the fourth edge with at least one cutting edge having at least two facets located on opposite sides of the utility knife blade relative to each other; wherein the method further comprises heat treating the second portion to a hardness within the range of approximately 60 Rc to approximately 75 Rc and the first portion to a hardness that is less than the second portion, the first portion extending between the first edge and the second portion and between the second edge and the third edge, the second portion defining the cutting edge and extending between the second edge and the third edge on an opposite side of the first portion relative to the first edge, and an interface between the first and second portions extending from approximately the second edge to approximately the third edge of the utility knife blade, wherein the step of heat treating occurs after the step of providing the utility knife blade body.