Bow sight

Details Bow sight Bow sight

1976-10-14

1978-08-29

Stearns, Richard R.

Geometrical instruments

Straight-line light ray type

Structurally installed

F41G 146

Patent

active

041093909

ABSTRACT:
A bow sight has a range-finding function that automatically aligns the trajectory path of the arrow to correspond to the range. The range is established by providing a sighting frame that establishes vertically-spaced reference lines that give the apparent height of a known object at a known distance. Rotation of the frame about a horizontal axis reduces the apparent spacing between the top and bottom of the frame, which is correlated to increased distance. As the frame is progressively rotated to the point that the apparent height corresponds to the observed height of the known object, the placement of the sighting frame with respect to the bow is altered vertically to align the bow with the correct trajectory for that distance.

REFERENCES:
patent: 2574599 (1951-11-01), Stieber
patent: 3058221 (1962-10-01), McNeel
patent: 3477130 (1969-11-01), Egan
patent: 3487548 (1970-01-01), Frydenlund
patent: 3666368 (1972-05-01), Sprandel
patent: 3861051 (1975-01-01), Killian

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