| 摘要 |
Blade-opening arrowheads having pivotal blades, wherein each blade is hingedly connected at one blade end to an arrowhead body by a hinge pin. Each blade may be disposed at an angle relative to the central axis of the arrowhead body. Each blade freely rotates in a plane from a retracted in-flight position to an open position when penetrating an object where the other opposing blade end rotates away from the arrowhead body such that the sharp cutting edges of the blades are exposed at a full cutting diameter when the blades are in the open position. When in the retracted position a blade is securely held selectively adjacent to the arrowhead body by frictional engagement from methods independent of, or not dependent upon, the use of an element or elements in addition to that individual cutting blade, its hinge pin and its blade slot.
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