A device for displaying the 30 degree safety angle required for hitting a ball

摘要

According to the principle of Pan American instrument, the device includes four fixed arrows ((3) two to two ((1 and 2). The fixed arrow is tilted at an angle of 30 degrees, and one hinge ((4) allows two arrows to rotate. When the hunter points the arrow in the dangerous direction, the 30 degree adjacent area between the two fixed arrows constitutes the general forbidden shooting area. The second arrow points beyond the axis is the recommended shooting area. The device allows the hunter to exclude two dangerous areas on either side of its position from the shooting area.meanwhile The device of the invention is particularly used to enhance the impact safety.