DE102004023757A1 - Fins for an arrow, comprise a propeller type geometry and are fixed to the arrow shaft via a foot section - Google Patents

Abstract

Fins for an arrow for use in archery, comprises a propeller type geometry (2) and are fixed on the shaft (3) of the arrow. The fins are injection moulded and have a broadened foot (5) at the arrow connection.

Description

The Invention is directed to a flag for fletching arrow raw shafts the for example used in archery, crossbow shooting, etc. become.

at Such sports are on the arrow raw shafts, flags (Feathers) made of plastic or natural flags (natural feathers) with a small angle to the longitudinal axis the shaft attached (eg glued) or flags are made Plastic so applied (eg glued) by the assembly (z. Bonding) a tension in the material to a twisted shape the flag (inflow surface) leads. In order to is achieved that the arrow shaft by the incoming air during flight, is set in rotation. Through this rotation will the arrow shaft stabilized in its trajectory.

Of Furthermore, the geometry (contour and size), the weight, the surface structure and the material for which determines the rotation and flight characteristics.

Here have the plastic flags (tarpaulin, not twisted flag, mostly produced by injection molding) the advantage of good processing, i. when mounting (z.b. stick on) on the arrow raw shaft.

Of the, During installation, the intended / intended, small angle between Longitudinal alignment of Flag to the longitudinal axis of the arrow raw shank, which is when applying the flags on the arrow raw shaft for example by means of fletching device (fletching device = device with their help, the flags position accurate and reproducible the arrow Roh-Schaft.) is reached causes that the shaft flows through it the air on the flag in flight, is put into a rotation. however This type of positioning / inflow surface is not ideal in the sense aerodynamics, because this type of positioning and thus the inflow one Air resistance and thus the arrow speed, i. the ballistic flight behavior negatively influenced.

in the By comparison, flags are punched from thin films, through strained application (eg sticking) in an S-shaped contour forced, which in turn causes this by the incoming air the shaft is set in rotation. This type of flags and their Above all, assembly has the advantage of low weight and a good aerodynamics and thus a good ballistic flight behavior. However, the required, caused by the assembly affect Tension in the material, which in turn is a prerequisite for the to achieve required geometry, negatively affecting the assembly (Difficult and unwieldy assembly).

Also loses the contour / bias and thus the rotation responsible geometry, through various influences like, Long-term behavior (fatigue of the material), temperature or mechanical influence, solve the Adhesive bond.

Further Flags of stamped or cut foils by further processing to / or at the cutting / punching brought in a three-dimensional shape have a low weight with good stability to deformation, however is not possible with this type of production, as with plastic flags, the injection-molded be a Klebefuß (adhesive foot = adhesive surface the is at a right angle to the main surface of the flag). This adhesive foot is for the Stick on (with or without fletching device) and thus for stability in use (use = Launch i. Flight of the arrow over a distance, from the launching point to the target) on the arrow raw shafts of Advantage because this type of assembly / bonding a great strength having. Also, the processing i. sticking with one Adhesive foot (with or without fletching device) easier to trade.

Farther have the flags made of stamped material the disadvantage that this material has very poor mechanical properties and resistances having. (Deformation and damage by kinking and tearing.)

Of these, Based on the invention, a flag with good aerodynamic Properties (maximum rotation) with low air resistance, good and easy processing properties when applied to Dart Raw Shank, Stable Durable Contour / Geometry / Shapes Fidelity and relatively high stiffness, if possible low weight, good long-lasting properties in use a cost-effective and reproducible production, to develop.

This was achieved by a very thin-walled 10 three-dimensionally shaped flag 1 (which is injection molded, reproducible, manufactured) Propeller-like 2 , Tension-free molded, made of a material that is characterized by good mechanical properties. Due to the additionally bulbous shape 4 is a further enhancement of the rotational behavior favors and at the same time leads to an increase in stability in flight. The stability in connection with the sticking on the arrow raw shaft 3 , continues to increase, due to the (partial) transition 7 the bulbous surface 4 in the two-sided outstanding 6 foot 5 ,

Due to the above-mentioned expression / geometry, the contour can be used 9 thereby reducing the system of flag 1 and Arrow Raw Shank 3 , in use, less sensitive to disturbances such as crosswinds.

With the above mentioned expression / geometry, the contour can be used 9 combine in different forms.

The attached on the bottom geometry (adhesive foot) 5 favors a good and easy assembly with good mechanical properties in use.

Optionally, by the extension (tabs) 8th Bottom mounted geometry (foot) 5 on both sides of the flag (beginning and end) also produces an additional mounting strength and thus further increases the strength of use.

following The invention is based on a preferred embodiment in connection closer to the drawing explained. Showing:

I , a single flag described according to the invention for flattening on arrow raw shafts in several views and for clarity in cross section. Side view, top view, front view and enlarged cross section in the front quarter to illustrate the bulbous design.

II , a three-dimensional view of a single flag described according to the invention. (greatly enlarged for clarity)

III , the three-dimensional view of an example in which three flags according to the invention described on a schematically shown Peil raw shaft (section in the rear area) were arranged attached.

Claims (7)

Archery archery flag with a propeller twisted geometry ( 2 ) for attachment to an arrow shaft ( 3 ), characterized in that the flag ( 1 ) is produced by injection molding eigenformstabil. Banner, flag ( 1 ) according to claim 1, characterized in that in the connection region with the arrow shaft ( 3 ) a common ( 6 ) Foot ( 5 ) is provided. Banner, flag ( 1 ) according to claim 2, characterized in that the widened ( 6 ) Foot ( 5 ) end protruding tabs ( 8th ) having. Banner, flag ( 1 ) according to claim 1, characterized in that it has a small thickness ( 10 ) having. Banner, flag ( 1 ) according to claim 1, characterized in that it is bulbous ( 4 ) is formed. Arrow with flags ( 1 ) according to one of claims 1 to 5, characterized in that the flags ( 1 ) with the shaft ( 3 ) are glued. Method for producing a sports bow arrow with a plurality of flags ( 1 ), characterized in that a. first the flags ( 1 ) integrally dimensionally stable with a propeller-like ( 2 ) Configuration and then b. the flags ( 1 ) with the arrow shaft ( 3 ) are glued.