Bow sight
US4109390A · kind A · utility
Inventors
Key dates
| Filing date | Oct 14, 1976 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Oct 14, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41G1/467
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.