1988-11-09
1991-01-22
Arnold, Bruce Y.
350561, 350565, G02B 2300
Patent
active
049866451
DESCRIPTION:
BRIEF SUMMARY
This application is entitled to benefit of the filing date of International Application No. PCT/SE86/00218 filed May 9, 1986 under the Patent Cooperation Treaty.
BACKGROUND OF THE INVENTION
The present invention relates to a gun sighting telescope.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a gun sighting telescope of the type referred to, in which a change of the magnification factor is automatically accompanied by a change of the elevation adjustment of the sighting telescope.
A further object of the invention is to provide a gun sighting telescope in which a point on the reticle or like sighting mark of the telescope covers an unvaryingly large area of a specific target, irrespective of the distance to the target, if the target is magnified in the sighting telescope by adjustment of the magnification factor to an image size which, to the eye, appears to be essentially the same. A specific object of the invention is to provide an arrangement which, in a gun sighting instrument of the type here concerned, automatically changes the elevation adjustment of the telescope with due regard to the distance to the target to compensate for the drop of a bullet following a specific, known trajectory.
These objects have now been achieved by imparting to the gun sighting telescope according to the invention the characteristic features stated in the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below, reference being had to the accompanying drawing which is a schematic and fragmentary axial section of a gun sighting telescope designed in accordance with the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The main components of the gun sighting telescope illustrated, such as the telescope barrel, i.e. the outer tube 1 with the objective lens 2, the ocular lens 3 and a reticle 4 in the object plane of the ocular lens, two relatively and axially adjustable holders, in this instance two telescopically displaceable inner tubes 5, with the associated inner lens system 6 and the adjusting device 7 for changing the magnification factor, are of per se known design and arranged in conventional manner.
A cam follower means 10 is mounted in the outer tube 1, and one of the inner tubes 5 is connected with a cam means 11, the cam surface 11' of which is engaged by the cam follower means 10. The cam means 11 preferably is resilient or spring-biased such that the two means 10, 11 will always be in contact with one another.
In the embodiment illustrated, the cam follower means 10 preferably is the elevation adjustment screw of the telescope, although the screw here acts upon the inner tube 5 via the cam means 11. Upon displacement of the two inner tubes 5, 5' by means of the adjusting device 7 for changing the distance between the lenses of the inner lens system, and thus the magnification factor, the cam means 11 is moved in an essentially straight axial path together with the corresponding inner tube 5 and thus in relation to the cam follower 10, the angle of elevation adjustment of the two inner tubes 5 within the outer tube 1 being changed in dependence upon the cam surface profile.
As already mentioned, the reticle 4 in the embodiment illustrated lies in the object plane of the ocular lens 3, and the image is not magnified by the reticle, at least not to any appreciable degree, if the magnification factor of the sighting telescope is increased.
This is important because in this manner a point, for example the crossing point, on the reticle will always cover an unvaryingly large area of a target which is located at varying distances from the sighting telescope but which, if the magnification factor of the telescope is changed, causes the marksman to see in the telescope an image which has not changed its size.
This in turn means that, if the marksman is aiming at a target, for example the head of a hare, and if the marksman by reticle selection has found that the above-mentioned point exactly covers the hare's head at a target distance of, f
REFERENCES:
patent: 3213539 (1965-10-01), Burris
patent: 3340614 (1967-09-01), Leatherwood
patent: 3431652 (1969-03-01), Leatherwood
patent: 4255013 (1981-03-01), Allen
patent: 4389791 (1983-06-01), Ackerman
patent: 4789231 (1988-12-01), Shimizu
Arnold Bruce Y.
Interaims Aktiebolag
Kachamarik Ronald M.
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