BACKGROUND OF THE INVENTION
CROSS-REFERENCE TO RELATED APPLICATIONS
The instant application is based upon French Priority Patent Applications No. 01.13458 filed Oct. 18, 2001 and No. 02.0.10938 filed Sep. 4, 2002, the disclosure of which is hereby incorporated by reference thereto in its entirety, and the priority of which is hereby claimed under 35 U.S.C. §119.
1. Field of the Invention
The present invention relates to a mount for a sighting device on a firearm.
The invention relates more particularly to a sighting device fixed to the barrel of the firearm and adapted to project a virtual image onto the target. Prior art sighting devices of this kind project a red dot onto the target, for example.
2. Description of the Prior Art
These sighting devices are normally disposed on the barrel at a particular distance from the eye of the marksman.
However, all sighting devices are raised, which obliges the marksman to raise his head so that his eye is aligned with the sighting device, with the result that his cheek is no longer applied to the stock, making shooting inaccurate.
Sighting devices are now offered that are light in weight and very small in size.
The prior art includes French patent No. 2 481 435 which discloses a luminous front-sight consisting of a diode.
The only advantage of this kind of sighting device is that in some circumstances the front-sight is more visible than other front-sights; however, this kind of sighting device has the disadvantage that, being attracted by the light, the eye is drawn to the front-sight instead of being fixed on the target.
The invention proposes to provide a mount for shooting in the same way as when using a standard sighting device (back-sight and front-sight), equally well with a rifle, a double-barrel rifle or a shotgun when using a sighting device that projects a virtual image.
SUMMARY OF THE INVENTION
A mount for mounting an aiming device of the type for projecting a virtual image onto a target on a firearm such as a shotgun or a rifle which includes a back-sight or a rib and a front-sight at the free end of the barrel includes means for fixing the aiming device at the location provided for the front-sight.
Thanks to this arrangement, the sighting device can be positioned so that the projected image lies on the back-sight/front-sight axis so that the marksman can fire with his cheek pressed against the stock and without having to raise his head. Moreover, parallax is eliminated and the field of view is much larger.
Finally, shooting is much improved. To sight on a target, the eye must be aligned with the back-sight and the front-sight and, in a smooth bore shotgun, with the eye perfectly aligned with the axis of the rib; any misalignment leads to a large aiming error. Because the “red dot” device always projects a light spot on the same axis, if the eye is not perfectly aligned and if the position of the cheek against the stock is not correct, the target can nevertheless be hit.
In one particular embodiment, the mount further includes a plate provided with means for fixing the aiming device to it and with means for fixing it to the location provided for the front-sight.
In one particular variant, the mount further includes a block incorporating a dovetail groove, the front-sight is carried by a support having a key adapted to be inserted into the groove, and the aiming device is fixed to a plate provided with a key matching the groove.
The mount preferably further includes means for selectively immobilizing the support of the front-sight or the plate supporting the aiming device in the groove.
According to one feature of the invention the block incorporates holes for a screw and the keys of the support and the plate incorporate a notch adapted to coincide with the holes and to cooperate with the screw.
According to another feature of the invention the screw is screwed into a nut and the nut and the screw have respective knurled heads.
Thanks to this arrangement, the front-sight and the aiming device can easily be interchanged.
In one embodiment, for a firearm in the form of a double-barrel rifle with two side-by-side barrels joined by a rib at the free end of which is a support for the front-sight, the plate is shaped to espouse the shape of the support and is extended by two flanges espousing the shape of the barrels and provided with tapped holes adapted to receive screws for fixing the aiming device, and the flanges are offset in the heightwise direction so that the axis of the virtual image coincides with the back-sight/front-sight aiming axis.
The support can include a tapped hole and the plate can include a hole for a fixing screw adapted to be screwed into the tapped hole.
In another embodiment the mount further comprises a bush adapted to be fixed to the free end of the barrel, a sleeve mounted to pivot on the bush and carrying the front-sight and the aiming device angularly offset from each other, and means for selectively locking the sleeve in either of two angular positions, in a first of which angular positions the aiming device is disposed so that the projected image is aligned with the back-sight or the rib and in the second of which angular positions the front-sight is aligned with the back-sight or the rib.
According to one feature of the invention the bush has at one end a flange constituting an abutment for one end of the sleeve and the sleeve is retained at its other end by the ring fixed to the barrel.
Finally, according to a last feature of the invention, the bush incorporates two blind holes offset by 180° from each other and connected by a groove and the sleeve incorporates a radial hole accommodating a ball spring-loaded by a spring so that it cooperates with the groove and selectively with the blind holes.
The invention is described next in more detail and with reference to particular embodiments provided by way of example only and shown in the accompanying drawings.