WO1981003375A1

WO1981003375A1 - Sarbacane for projectiles such as arrows or similar and method for its production

Info

Publication number: WO1981003375A1
Application number: PCT/DE1981/000073
Authority: WO
Inventors: V Hundertmark
Original assignee: V Hundertmark
Priority date: 1980-05-22
Filing date: 1981-05-21
Publication date: 1981-11-26
Also published as: DE8013988U1; EP0052123A1

Abstract

Sarbacane for projectiles such as arrows or similar consisting essentially in a tube (3) made of fiber reinforced plastic. According to a method of production of such a sarbacane, a cylindrical core, the external diameter of which is equal to the given internal diameter of the tubular body and the length of which is at least as long as the given length of the tubular body, is embedded in a fibrous material which, as soon as it is wound arround the core, is impregnated of a liquid plastic material and this plastic impregnated fibrous material adhered to the core is heated to cause its hardening. The core with the hardened material arround it is then cooled and after cooling the core is withdrawn. As for the sarbacane projectiles (7), it is proposed to provide their front face with a protruding mark (11) which will leave a sign on the target.

Description

Blow pipe for projectiles such as arrows or the like. and process for its manufacture

The invention relates to a blow pipe for projectiles such as arrows or the like., Consisting essentially of a tubular cylindrical body with an extending concentrically to the longitudinal axis _/ Durchgangs¬ öff ung.

The invention further relates to a method for producing such a blowpipe, in particular its tubular body.

Such blowguns have long been known per se, in particular by the indigenous people of the Brazilian Amazon region, who use blowguns as hunting weapons, the projectiles there being arrow-like structures which are partially provided with narcotic poisons and which are introduced and introduced into the tube body at the point of introduction thereof then by blowing

OMPI at this end, which may be provided with a mouthpiece, it is shot (blown) through the tubular body onto the target in question, the projectiles reaching an astonishing speed, so that with careful design of the blowpipe and the projectiles belonging to it, even relatively large ones Distances a relatively high accuracy can be achieved.

In more recent times, such blowguns have also become increasingly popular in civilized areas, in the broadest sense for game purposes, although in the meantime - similar to archery - a comparatively large group of people has already formed who literally practices blowgun shooting as a sport. »

A prerequisite for this, however, like more or less in all sports, is that the results obtained are essentially determined by the skill and skill of the blowgun shooter and as little as possible by chance. This therefore presupposes - just as in shooting with handguns - that the sports equipment, in this case the blowgun, meets certain requirements, which has not been the case to date or to an unsatisfactory extent.

As has already been briefly indicated above, the main component of a blowpipe is the elongate, generally cylindrical, but in any case having a cylindrical passage opening, through which an arrow, a clay ball or another suitable projectile is blown, in which

OMPI, WIIPPOO this blowing usually takes place at a mouthpiece arranged at one end of the tubular body, while at the other end of the tubular body there is often also an endpiece at which there is generally still a target grain in order to be able to aim the target in question as well as possible.

The quality of a blowgun, which is based on accuracy, is essentially determined - similar to, for example, a rifle - by calibrating the "barrel", ie the pipe body, the caliber-determining inner diameter of the pipe body not only over the entire length of the blow ¬ tube should be as constant as possible, but also for an exact calibration it is necessary that the central axis of the tubular body runs as linearly as possible, that the inner wall of the tubular body is as smooth as possible etc.

If, for example, the tubular body has a substantially constant inside diameter, but a curved or otherwise deformed through-hole, there are evidently obstructions to the projectile during the shooting (blowing), which increase the firing range Adversely affect accuracy, etc.

If, for example, the inner wall of the tubular body is not sufficiently smooth, friction losses occur, which have a similar disadvantageous effect on the blowpipe shooting.

If the inside diameter of the through hole varies, it will be more linear, even with more or less accuracy Extending the central axis of the through bore of the tubular body in such a way that there is too much play between the outer surface of the projectile facing the tubular body and the tubular body, with the result that a portion of the air blown in passes unused for the acceleration of the projectile and can escape the blow pipe unused, which of course results in a corresponding reduction in the range of the projectile.

For the reasons mentioned above, it is therefore also not sufficient if such a blowpipe initially meets the aforementioned requirements, but loses them over the course of time due to mechanical, thermal or other effects. Rather, in the case of a blow pipe of high quality, it must also be ensured that any remaining deformations are avoided, and it is therefore desirable that a blow pipe has properties which enable it to withstand a certain deformation due to mechanical stress or the like. to automatically revert to its original state.

Initially, wood was used as the material for the tubular body of blowpipes, as in the case of the Indians in the Amazon region. However, such wooden blowpipes in no way meet the aforementioned requirements, particularly with regard to the exact calibration required.

There are therefore already known blowpipes whose pipe bodies are made of PVC. These blowguns are superior to the wood blowguns in many respects, since they are relatively simple and inexpensive to manufacture and, due to their low weight, also relatively

OM are easy to handle, but with these known PVC blowpipes neither the required precision with regard to exact calibration nor a sufficiently high mechanical stability can be achieved. In addition, permanent deformations occur not only in the case of mechanical stresses which are unavoidable over the course of time, but also in the case of thermal stresses, which can lead to warping and / or to a change in the inside diameter over the length of the tube body , which leads to the disadvantages mentioned above.

Attempts have been made to overcome these considerable disadvantages by making the tubular bodies made of PVC relatively short, since it is known, for example, that a short tube does not bend as easily as a long one, but this measure inevitably leads to new disadvantages, since the target accuracy to be aimed at decreases considerably with a shortening of the tubular body, because the projectile is accelerated only over a correspondingly short distance or a correspondingly short time, so that these measures have also not led to satisfactory results.

The present invention has for its object to improve the known blowpipes of the type described above while avoiding their disadvantages and to create such a blowpipe with the highest precision, that is, inter alia with exact calibration, straight axis course and the smoothest possible inner wall, which moreover not only sufficient strength, but also has a high dimensional stability, and which is nevertheless as light as possible with regard to handling, while at the same time the aim is that these advantages can be achieved with the least possible manufacturing outlay using a corresponding method.

As a solution to this problem, the invention provides that the tubular body consists of a fiber-reinforced plastic tube.

It has been shown that such a blowpipe not only avoids the aforementioned and further disadvantages at all, but also further surprising advantages can be achieved, in particular if the blowpipe is designed according to preferred configurations and / or according to a er¬ inventive method is produced, as will be explained in more detail below.

In a preferred embodiment of the present invention, the fiber reinforcement consists of several superimposed fiber layers, which are preferably mat-shaped fiber material, namely glass fiber material, carbon fiber material or Kevlar, and polyester being special as a plastic have expediently pointed out.

Although such a long-fiber material is to be regarded as a particularly preferred embodiment, considerable advantages are achieved with fiber reinforcement, which consists of relatively short fiber sections, compared to the prior art. which are essentially uniformly distributed in the plastic material, with such a configuration the plastic tube for the tubular body being able to be extruded.

The blowpipe according to the invention is preferably produced in such a way that a cylindrical core, preferably made of steel, the outer diameter of which is equal to the predetermined inner diameter of the tube body and the length of which is at least as long as the predetermined length of the tube body, is wound with fiber material that the fiber material wound around the core is then impregnated with liquid plastic, that the fiber material impregnated with plastic is then heated on the core for the purpose of curing, the core with the hardened material on it is then cooled, and finally the core is removed after cooling.

It has proven to be particularly expedient if the core is polished to a high gloss on its outer surface before the winding, since such a finish of the core outer surface leads to an extremely smooth inner surface of the tubular body, as is desired for the reasons mentioned above.

In the method according to the invention, the fiber material impregnated with plastic is preferably surrounded by a removable jacket before heating, which according to a particularly expedient embodiment of the present invention can consist of a plastic film strip, and which is made according to the length that is generally carried out moderate cutting of the tube body to its finished length is later removed.

In order to be able to read off the hits, in particular of several blowgun shooters, on a suitable target device, if the projectiles are not self-adhesive projectiles or projectiles with tips that get stuck in the target, the projectiles are preferably each on their target Provide the front face with a protruding mark, which protrudes beyond the actual front face of the projectile. This can be, for example, hemispherical points of different numbers or the like. act. These markings are preferably formed on the target for better distinction, but are essentially linear and have an essentially triangular cross section which tapers towards the free outer end, so that in such a configuration, the correspondingly prepared ones Target shows a corresponding mark. These lines can form geometric figures such as triangles, crosses, squares, etc., but also, for example, letters, numbers or the like, which protrude from the front end of the projectile and are correspondingly reproduced there when striking the target.

In addition, the projectiles preferably have a head which is rotationally symmetrical with respect to the longitudinal axis, which can be rounded at the front end section to improve the flight characteristics and which can have a central recess at the rear end section, which can expediently be flattened, which is preferably spherical is how this is explained below using an embodiment

O example is explained further.

Preferred embodiments of the present invention are described in the subclaims.

The invention is explained below using exemplary embodiments with reference to a drawing. It shows:

1 is a side view of a blowpipe according to the invention;

FIG. 2 shows a view according to FIG. 1 in a central longitudinal section;

3 shows a section through a floor;

Fig. 4 different configurations of

Markings of the projectile according to FIG 3 in an enlarged view.

FIG. 5 is a section through the marking profile according to FIG. 4e in the direction of the section line V-V in FIG. 4;

6 shows a plan view of a target device in the direction of arrow VI in FIG. 7;

7 shows a side plan view of the target device according to FIG. 6 in the direction of arrow VII in FIG. 6; and

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/ ,. W WIIPPOO 8 is a top view of the target device according to FIGS. 6 and 7 in the direction of arrow VIII in FIG. 7.

FIGS. 1 and 2 of the drawing show a blow pipe for projectiles 7, such as arrows or the like, designated overall by 1, with FIG. 1 representing a side view and FIG. 2 corresponding to FIG. 1 in a longitudinal section.

The blowpipe 1 consists of an elongated tubular body 3 with a concentric to its longitudinal axis 8 through opening with a cylindrical inner wall 6. At one end of the tubular body 3, a funnel-shaped mouthpiece 2 for blowing air is attached, while at the other end of the Tubular body 3. an end piece is attached, on which a target grain 5 is located. In order to further improve the accuracy, if necessary - as indicated by dash-dotted lines in FIG. 1 - an additional sight 9 can also be attached to the tubular body 3, which must be aligned with the sight 5 when aiming at a target, such as this of firearms such as Guns are known per se.

The tubular body 3 is formed by a fiber-reinforced plastic tube, the fiber reinforcement consisting of a mat-shaped glass fiber or carbon fiber material which is in several layers one above the other and is intimately connected or filled by plastic, preferably polyester or kevlar, and which according to the invention is manufactured as follows:

^Q First, a cylindrical steel core, the outer diameter of which is equal to the predetermined diameter of the inner wall 6 of the tubular body 3, and whose length is greater than the predetermined length of the tubular body 3 is wound with the fiber material in several layers until a thickness of approximately 2 mm is reached. The fiber material wrapped around the core is then impregnated with liquid plastic. Then the fiber-impregnated plastic material or the like with a film strip of cellophane. wound and then heated on the core for curing in an oven. After hardening, the core with the hardened material located on it is cooled, whereupon after cooling on the inside 6 of the tubular body 3 the core and on the outside of the tubular body 3 the cellophane strips are finally removed. Ultimately, the tubular body is cut to length and connected to the mouthpiece 2, possibly a center piece 10 carrying a sight 9 and the end piece 4 bearing the sight 5 '.

Since a metal core with a highly polished surface is used as the core, the tubular body 3 and thus the blow pipe 1 has an extremely smooth inner wall 6 with an extremely precise, constant diameter and thus exact calibration, so that the blow pipe according to the invention has an extraordinarily high accuracy and shot ¬ performance can be achieved.

In addition, the blowpipe 1 has an extremely high strength against mechanical, thermal and other stresses, so that the excellent properties achieved in the manufacture also during

OMPI Use of the blowpipe can not be changed. The blowpipe according to the invention has a sufficiently high elasticity for normal stresses, which ensures that the tube body always returns to its original starting position after any mechanical stresses, without any permanent deformations occurring. This is not the case even if the tubular body is designed to be relatively long in order to improve the targeting accuracy and the shooting performance, with nothing of this kind also preventing handling, since the aforementioned and further advantageous properties are achieved with an extremely low weight .

FIG. 3 shows a section through the head or the tip of a projectile 7 according to the invention (see FIG. 2). The projectiles 7 which are preferably used according to the invention each have a projecting marking 11 on their front end facing the target, which is preferably formed essentially tapering towards the free end, in the embodiment shown essentially in line form, as shown in FIG. 4 enlarged on examples, and with a substantially triangular cross-section, as shown in FIG. 5 in a large enlargement.

4 a - f, these markings 11 can be designed as linear, geometric figures, for example as a square (FIG. 4 a), triangle (FIG. 4 circle (FIG. 4 c), cross (FIG. 4 d), or else also as letters, of which Figures 4e and 4f represent letter marks L and T. In addition, there are

OI According to the invention, there are also numerous other possibilities for designing the markings 11, namely, for example, as numbers, points of different numbers, etc.

Before the operation of these projectiles is explained in more detail, reference should be made to FIG. 3 that the projectiles 7 have a head 13 that is rotationally symmetrical with respect to their longitudinal axis 12 and rounded at the front end section, and that they prefer at their rear section ¬ as flattened and there are provided with a central recess 14 for receiving an arrow stick 15.

Such projectiles can be used particularly expediently in connection with a target device, as is shown in FIGS. 6 to 8. This aiming device, designated as a whole by 16, has two holders 17 on which a web 18 made of paper or a suitable foil is wound, which web 18 is wound into a roll 19, the free end of which is guided by two guides 20 over a relatively soft, deformable base 21 which is located on a frame 22. Projectiles 7 are shot onto the target device 16 and thus onto the track 18, which for this purpose is expediently provided with target circles or the like. is printed, the markings 11 of the storeys 7 form on the web 18 and can be read relatively clearly on this.

The blow pipe 1 is actuated in a manner known per se; there is first a floor 7 in general from the mouthpiece 2 into that from the inner wall 6

O PI limited passage opening of the tubular body 3 is introduced and then blown by blowing on the mouthpiece 2 in the direction of the arrows 23 through the excellently calibrated firing channel, so that the projectile 7 passes through it in the direction of the arrows 23 and finally leaves in the direction of the target . Due to the extremely precise calibration, the play between the jacket of the projectile 7 and the inner wall 6 of the tubular body 3 is not only relatively small, but above all also extremely uniform, so that practically no air passes unused through the projectile 7 and the projectiles 7 can hurry through the firing channel without hindrance, whereby they "float" as it were without contact with the inner wall 6 and thus without considerable friction losses due to the excellent calibration and the surface quality of the inner wall 6, since they each lie between the shell of a projectile 7 and the Inner wall 6 in the narrow air gap air when passing through the tubular body 3 act as a lubricating pad.

- _$ CfRE OMP

Claims

EXPECTATIONS

1. blow pipe for projectiles such as arrows or the like, essentially - consisting of a Rohrkör ^ c - with a concentric to its longitudinal axis, cylindrical through-opening, characterized in that the tubular body (3) consists of a fiber-reinforced plastic tube.

2. Blowpipe according to claim 1, characterized in that the fiber reinforcement consists of several superimposed fiber layers.

3. Blowpipe according to claim 1 or 2, characterized gekenn¬ characterized in that the fiber reinforcement consists of a mat-shaped fiber material.

4. Blower tube according to one or more of the preceding claims, characterized in that the fiber reinforcement consists of glass fibers.

5. Blow pipe according to one or more of claims 1 to 3, characterized in that the fiber reinforcement consists of carbon fibers.

6. blowpipe according to one or more of claims 1 to 3, characterized in that the fiber reinforcement consists of Kevlar.

OMPI

7. blowpipe according to one or more of the preceding claims, characterized in that the plastic is polyester.

8. blowpipe according to claim 1, characterized in that the fiber reinforcement consists of relatively short fiber sections which are distributed substantially uniformly in the plastic material; and that the plastic tube is extruded.

9. Blowpipe according to one or more of the preceding claims, characterized in that a mouthpiece (2) is arranged on the tubular body introducer for the projectiles (7) in a manner known per se.

10. Blowpipe according to one or more of the preceding claims, characterized in that a socket-shaped end piece (4) is arranged on the tube body committee end, the clear diameter of which is at least as large as the diameter of the tube body (3).

11. Blowpipe according to claim 10, characterized in that the end piece (4) is provided with an upstanding target (5).

12. Blowpipe according to claim 11, characterized in that a target rear sight (9) is arranged at a distance from the target grain (5) and in the longitudinal direction thereof.

13. Blowpipe according to one or more of the preceding claims, characterized in that the projectiles (7) in each case on their front end facing the target

O are provided with a protruding marking (11).

14. Blowpipe according to claim 13, characterized in that the marking (11) is formed tapering towards the free end in the essence.

15. A blowpipe according to claim 14, characterized in that the marking is formed substantially in line form and has a substantially triangular cross-section.

16. Blow pipe according to one or more of the preceding claims, characterized in that the projectiles (7) have a head which is rotationally symmetrical with respect to their longitudinal axis (12) and rounded at the front end section.

17. Blowpipe according to claim .16, characterized in that the projectile heads (13) have a central recess (14) at their rear end section.

18. Blowpipe according to claim 17, characterized in that the recess (14) of a projectile head (13) is substantially spherical.

19. Blowpipe according to one or more of the preceding claims, characterized in that the projectile heads

(13) are substantially flattened at their rear end portion.

20. A method for producing blowpipes according to one or more of the preceding claims, characterized gekenn¬ characterized in that a cylindrical core whose outer diameter is equal to the predetermined inner diameter of the Rohr¬ body, and whose length is at least as large as

O PI the predetermined length of the tubular body is wound with suitable fiber material; that the camouflaged core material is then impregnated with liquid plastic; that the fiber material impregnated with plastic is then heated on the core for curing; that the core with the hardened material on it is then cooled; and that the core is removed after cooling.

21. The method according to claim 20, characterized in that the length of the core is greater than the predetermined finished length of the tubular body; and that the tubular body is cut to the predetermined finished length after removal of the core.

22. The method according to claim 20 or 21, characterized gekenn¬, that the core is wound with mat-shaped fiber material.

23. The method according to claim 22, characterized in that the fiber material consists of glass.

24. The method according to claim 22, characterized in that the fiber material consists of carbon.

To ^'24, characterized in 25. A method according to one or more of claims 20, that the core is wound in several layers with fiber material.

26. The method according to one or more of claims 20 to 25, characterized in that the core is wound in a thickness of about 1 to 5 mm with fiber material.

27. The method according to claim 26, characterized in that the core is wound in a thickness of about 2 mm with fiber material.

28. .A method according to one or more of the claims

20 to 27, characterized in that the fiber material is wound on a metal core.

29. The method according to one or more of claims 20 to 28, characterized in that the core is polished on its outer surface before winding.

30. The method according to one or more of the claims

20 to 29, characterized in that the fiber material impregnated with plastic is surrounded with a removable jacket before heating.

31. The method according to claim 30, characterized in that the plastic material-impregnated fiber material is wrapped with a film strip.

32. The method according to claim 31, characterized by a film strip made of plastic.

33. The method according to claim 31 or 32, characterized gekenn¬ characterized in that the film strip is removed after the lengthwise cutting of the tubular body to its finished length.

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