Geometrical instruments – Straight-line light ray type – Structurally installed
Patent
1986-09-26
1987-06-02
Stearns, Richard R.
Geometrical instruments
Straight-line light ray type
Structurally installed
F41G 146
Patent
active
046691960
ABSTRACT:
A rangefinding adjustable bow sight for use with an archery bow having a mediate grip portion. A frame is adapted for rigid attachment to the bow adjacent the grip portion. A lead screw is mounted to the frame such that the axis of the lead screw is generally parallel to the length of the bow, and such that rotation of the lead screw about its axis with respect to the frame is permitted. The lead screw has a first section having a first thread pitch and a second section having a second thread pitch different from the first thread pitch. A first rangefinding pin is fixed to the frame. A second rangefinding pin is movably mounted to the frame by a follower block threadedly engaging the first section of the lead screw for moving the second rangefinding pin axially with respect to the lead screw as the lead screw is rotated. A sight pin is movably mounted to the frame by another follower block threadedly engaging the second section of the lead screw for moving the sight pin axially with respect to the lead screw as the lead screw is rotated. A manually operable disk wheel is provided for selectively rotating the lead screw about its axis in either direction. The first and second rangefinding pins and the sight pin are disposed with respect to each other such that as the distance between the first and second rangefinding pins increases, the sight pin is raised toward the top of the bow.
REFERENCES:
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patent: 3861051 (1975-01-01), Killian
patent: 3871105 (1975-03-01), Brougham
patent: 3910700 (1975-10-01), Sprandel
patent: 4020560 (1977-05-01), Heck
patent: 4109390 (1978-08-01), Smith et al.
patent: 4153999 (1979-05-01), O'Steen
patent: 4328625 (1982-05-01), Carella
patent: 4481717 (1984-11-01), Kowalski
patent: 4535747 (1985-08-01), Kudlacek
patent: 4543728 (1985-10-01), Kowalski
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