Range-finding telescopic sight
US4389791A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 4, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | May 4, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A telescopic sight provides means for determining the range of a target of known size and for compensating for predetermined bullet drop over the target range. Reticles are fixed in both the front and rear focal planes of the sight, and first screw means, calibrated to indicate range, are provided for controllably rotating the erector tube to displace the image of the front reticle, formed in the rear focal plane, so as to bracket the target between the rear reticle cross-hairs and the image of the front reticle. Second screw means, also operable to rotate the erector tube, displace the target image so as to compensate for bullet drop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.