The invention relates sports and hunting throwing weapon, and more particularly to the weapon using the energy of a strained solid body; it may be used for designing and engineering the weapon for throwing projectiles, namely, a crossbow.
There is a known (U.S. Pat. No. 4,879,987) reverse crossbow containing a barrel, a trigger mechanism, a limbs riser, the limbs directed in the shooting direction having cams fixed to their ends, a hinged wheels device fixed to the barrel, a bowstring passing through cams and hinged wheels device.
One drawback associated with the known crossbow is the complex system of threading the bowstring and hinged wheels device that transfers vibrations arising in process of shooting to the barrel, as well as an inefficient arrangement of limbs on the limbs riser and the design of fastening of the limbs riser to the barrel. Besides the known design of a crossbow is nonseparable, thus it is impossible to remove the assembled bow from the barrel.
There is a known (RU patent 2093771/U.S. Pat. No. 5,630,405) reverse crossbow containing a limbs riser; the limbs directed in the shooting direction; the cams located on the ends of limbs; the bowstring and cables passing through cams; the barrel carrying a limbs riser and a trigger mechanism. Besides the known crossbow contains a carriage located on the bowstring, a carriage guide, an arrow guide. Thus the barrel is made with a groove and with a horizontal slot located in its forward part, the carriage is made with the longitudinal groove located in its bottom part, a channel under a bowstring and cut-outs located on its front surface, where the number of cut-outs corresponds to the number of arrow head fletchings.
It is necessary to recognize as a drawback of the known crossbow, the location of the limbs riser, the geometry of limbs arrangement, the layout of bowstring, that in turn leads to reducing the power stroke, to inefficient use of energy accumulated by limbs after cocking the crossbow, large dimensions of the crossbow, limited opportunities for balancing the crossbow, caused by constructive imperfection of separate units, as well as the all crossbow design as a whole.
The object of this invention is to create an advanced design of a crossbow allowing to increase the overall performance of limbs, to simplify the process of assembly and disassembly of a crossbow for transportation and storage, to reduce overall dimensions of the crossbow, to improve balancing and ergonomical characteristic of a crossbow, to lower the noise level and kickback when shooting, to reduce vibrations arising when shooting.
The technical result achieved by realization of this invention, consists in improving the maximal initial speed of the thrown projectile, improving the accuracy and grouping of shooting, reducing the overall dimensions of a crossbow, decreasing the kickback, noise and vibrations when shooting, simplifying the process of assembly and disassembly of a crossbow, making the replacement of bowstring and cables easier, improving the balancing and ergonomic properties of a crossbow.
For achieving the above technical result the author proposes to use a crossbow containing a limbs riser, the limbs directed in the direction of shooting, the cams located on the ends of limbs, the bowstring and cables passing through cams, a barrel carrying a limbs riser and a trigger mechanism. Here the limbs riser is located at the edge of the barrel behind the trigger mechanism and centered relative to the barrel using a cone on the bottom surface of the limbs riser and reciprocal conical recess in the barrel, where the limbs riser is fixed using a single threaded junction that allows to improve balancing of a crossbow and to simplify the process of assembling and disassembling the crossbow to the maximum. The initial angle of installation of limbs on their riser and the point of their fastening are chosen so that when raising the crossbow the axis of rotation of each cam crosses the line parallel to the central axis of the crossbow and passing through the point of the beginning of bend of each of the limbs, thus the distance between axes of rotation of the cams of the cocked crossbow is less than the distance between the points of the beginning of the bend of limbs, that together with the chosen initial position of cams allows to realize the most efficient operation of the limbs, to reduce the dimensions of crossbow, to reduce the noise level and the kickback. The tension bars of cables are designed in such a manner that they allow to use a compact detachable device for mounting and removing the bowstring and cables. The shape and the angle of inclination of the crossbow foregrip allows the shooter to choose the most convenient position for holding the crossbow and for shooting.
Further the design will be disclosed with the use of a graphic material, where:
The main units of this design of reverse crossbow are further described in detail.
The limbs riser 1 of
Such an arrangement of limbs riser 1 allows as against the known designs (U.S. Pat. No. 4,879,987; U.S. Pat. No. 5,630,405) to extend the limbs 2 without extending the overall dimensions of the crossbow thus extending the resource, the service life of limbs 2 and the stability of their operation due to distribution of bending load over a much greater area of a loose part of limbs during their operation.
The limbs riser 1, in combination with limbs 2, cams 9, 10 and fixed bowstring 13, cables 11, 12, is attached by a single screw 8 to the top of the barrel 3 thus providing a convenient and fast assembly and disassembly of the crossbow for transportation and storage (
When mounting the limbs riser 1 of
In this design of a reverse crossbow (
The above layout of limbs 2, has allowed to reduce considerably the range of movement 20 of cables 11, 12 along the axis of crossbow 17 thus reducing the vibration and loss due to friction arising in connection with longitudinal movement of cables when shooting.
In this design for increasing the initial velocity of a the thrown projectile, there is a fixed initial position of the cam 10 (
This design of a crossbow (
This design of a crossbow uses a foregrip 35 (
The foregrip 35 has a conic shape with roundings on its ends and with a thickening in the area most close to the crossbow barrel 3. The thickening have such a size that shooter's fingers cannot fall into the working area of the bowstring thus providing the safety and convenience of holding the crossbow when shooting.
This design of a crossbow is to be used as follows. The bowstring 13 is to be pulled by applying force in the direction of the point of its fixing 41 to the trigger mechanism 4. Thus the loose parts of limbs 2 are bent in the direction of barrel 3, reserving the energy for shooting, the cams 9, 10 having two peripheral surfaces are rotating about the axis of rotation 16, thus unwinding the bowstring 13, at the same time the cables 11, 12 are spooling on cams 9, 10. After fixing the bowstring 13 on the trigger mechanism 4 the crossbow is ready for shooting.
The use of this crossbow design increase the maximum initial speed of the thrown body, increases the shooting accuracy and grouping of shots, reduces the crossbow dimensions, decreases kickback, noise and vibrations during shooting, simplifies crossbow assembling and disassembling, makes bowstring and cables replacement more comfortable and improves crossbow balancing and ergonomics.
Number | Date | Country | Kind |
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2007114803 | Apr 2007 | RU | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/RU2007/000218 | 5/3/2007 | WO | 00 | 12/2/2007 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2008/130264 | 10/30/2008 | WO | A |
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