DE102004034730A1 - Compound bow for archery has handle and two long stretching arms and two guide rollers are present between ends of stretched arms whereby guide rollers rest on transformation wheels which are tensioned with spiral spring - Google Patents

Abstract

The compound bow has a handle and two long stretching arms whereby two guide rollers are present between the ends of stretched arms. The two guide rollers rest on the transformation wheels, which are tensioned with spiral spring. The bow can be folded up when required.

Description

The The invention relates to a compound bow. In addition to the longbow and the Recurve bow, which is reflected by the arch vault front bent end portions of the arms is a compound bow, which is described, for example, in US Patent 3,486,495 by a pulley-like System characterized by a 50% reduction in pull-out the over Guided pulleys Tendon reached.

modern compound bows have an initial energy of up to 140 joules and reach arrow speeds from up to 450 km / h. The middle part of a compound bow is usually fixed made of a hard material such as aluminum or magnesium or else milled from carbon composite material and only the limbs acting as spring elements are flexible executed.

One The main advantage of Compoundbogen is that at comparatively large force can be maintained with low energy of the full extension. this makes possible a calmer aiming.

One Disadvantage, however, that by the multiple-tensioned cable the Providing a cable deflector is necessary to get the cables out to keep the trajectory of the arrow. The cable deflector, however, will Apply torque (torque) to the limbs. By the company C. P. Oneida Eagle Bows is already a compound bow known, at each limb by its own pulley the middle of the bow is kept clear of the cables.

When Arrow rests in the middle of the handle part are in particular Stainless steel pins proposed in a sleeve through a thread in height can be adjusted and thus different arrow diameters are customizable. Provided the tip is made of ferromagnetic material, the arrows become Magnetically stored on these arrowheads, so that the tips no big ones support surfaces have to serve.

task the present invention is now to provide a bow the largest possible Accuracy (avoidance of torque, which spreads on the outrigger arms the arrow is precisely under Application as possible low power can be fired. Next, the bow should be easy to be transported and not by a variety of individual elements of repair or become unwieldy.

Further Features and advantages of the invention will become apparent from the following Description of a preferred embodiment with reference to attached Drawing. Showing:

1 the bow according to the invention in a ready-to-fire configuration,

2 the arc of the invention 1 in an exploded view with a separately represented string guide,

3 the structure of the return drum,

4 a height adjustment by adjustable pulleys at the ends of the boom arms,

5 the tendon, essentially protected in the cantilever arms,

6 a folded representation of the sheet according to the invention in transport position,

7 an arrow rest by an electromagnet, and

8th the representation of 7 in partial section showing the arrowhead.

The Indian 1 Compound arch shown is characterized by rigid cantilever arms, at the ends of which guide rollers store the tendon, and return drums, which are arranged at the transition between the executed handle part and the convex cantilever arms, and tension the tendon and the necessary for the Pfeilabschuß when extracting the tendon Provide energy through return train. A stand height adjustment is realized by in the Auslagerarmenden in a slot guide adjustably mounted Umlenklager.

2 Figure 4 shows the string guide in an exploded view again, the pulleys at the ends of the extension arms being disengaged therefrom, as are the return pulleys, which are also shown separately.

In the 3 The structure of the return drums is made of a spring drum housing, which is mounted in a hinge cup and carries in addition to an axis in the spring on which a cover with a plurality of bolts, the other drum block half is arranged. On the axle is the "Wheel", the bearing wheel on which the string is attached, so the return drums store the Tendon on a translation wheel in an outboard notch, with the translation wheel biased by coil springs.

In the 4 is the stand height adjustment shown by displacement of the pulleys in a slot on the basis of a detailed representation of the Auslegerarmenden.

In a comparison of 5 and 6 Finally, it can be determined how much the arch can be reduced for transport. In both representations, the tendon is protected within the cantilevered arm.

In the 7 Finally, a preferred arrow rest, which centrally holds the arrow by means of a built-in handle of the arc battery and advantageously electromagnet the arrow floating without touching the arrow rest in this hole in the handle. In this case, the (electric) magnets are arranged in an annular manner around the arrow opening formed in the grip part, in which the arrowhead rests centrally in front of the shot as intended.

The Materials that are used consist of one with plastic sheathed fastflight fabric for the tendon, which has small metal pins at its end, the pierce the tissue and for the storage of the tendon in the holes of the translation wheel in the return drum serve.

Over a Variety of locating pins are the drums in the handle part attached. The case of the Spring drums consists of unbreakable fiber plastic and the joint cups are made of aluminum or titanium. The same applies to the translation wheels.

Different as previously known sheets, where the cantilever arms act as springs, the force of the Bow exclusively pulled out of the tension of the two coil spring and the translation the diameter of the translation wheel. Correspondingly strong springs are known in the market. Next can also find a rolling elastic band use. Also a realization with ring springs is possible.

By the rigid limbs becomes the hand shock and also the "torque", the twisting eliminated and there is a minimal energy loss during use up of an arrow. As a result, the bow is particularly shake-proof and by the further proposed arrow rest results in another User-friendliness and perfecting of the target accuracy. Also another problem of the compound bow is the risk of breakage at empty shots, because of the high energy stored, if not can be given to an arrow, so far up to the bridge of the bow to lead could, been successfully eliminated.

The Hinge function in the field of return drums is by a or multiple fixing pins achieved by appropriate pressure from the outside solved her fixation recording can be whereupon the bow can be folded. When unfolding the tendon is already stretched to a part.

There modern bows already over External laser aiming devices have the distance to the target to be able to determine exactly (as in holding against the gravity of the earth is still essential more important than guns) is already in some arcs one Power source integrated, but usually a very small, for example to supply a laser pointer.

Of the bow according to the invention now offers room for an integrated power source with batteries. These can now be used further be, over electromagnets a corresponding electrically conductive winding at the arrowhead magnetic to hold in the balance so that the arrow is exactly centered in the Arrow mount non-contact is held.

By The realized torsion-free bow can be inserted for the first time realize such a concept and an arrow without one-sided influence When writing the bow shoot straight forward. at previous bows a certain compression of the arrow was unreasonable, that the Arrow on one side on an arrow rest and friction with you had, affected the trajectory.

At the bow according to the invention however, it is possible a non-contact To realize storage for Right and left handed equally is usable and offers the advantage that arrows different Diameter without readjusting the arrow rest, as before was necessary, can be fired alternately.

Claims (4)

Compound bow, with a handle and two the Sinewing cantilever arms, characterized by two, the at the ends of the rigidly executed Extension arms over Deflection rollers deflected tendon exciting return drums. Compound bow according to claim 1, characterized that the Holt rear drums the string on a translation wheel in an outside store lying notch, with the translation wheel with coil springs is biased. Compound bottom according to one of the preceding claims, characterized by an arrow opening formed in the grip part, in the area around the storage location an arrowhead magnets ring are arranged. Compound bottom according to one of the preceding claims, characterized by a height adjustment by adjustably mounted in the Auslagerarmenden in a slot guide Umlenklager.