EP0213229B1 - Archery arrow nock - Google Patents

Archery arrow nock Download PDF

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Publication number
EP0213229B1
EP0213229B1 EP85111005A EP85111005A EP0213229B1 EP 0213229 B1 EP0213229 B1 EP 0213229B1 EP 85111005 A EP85111005 A EP 85111005A EP 85111005 A EP85111005 A EP 85111005A EP 0213229 B1 EP0213229 B1 EP 0213229B1
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EP
European Patent Office
Prior art keywords
nock
base
cam
groove
arrow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85111005A
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German (de)
French (fr)
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EP0213229A1 (en
Inventor
Werner Beiter
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to AT85111005T priority Critical patent/ATE32945T1/en
Priority to EP85111005A priority patent/EP0213229B1/en
Priority to DE8585111005T priority patent/DE3561845D1/en
Priority to US06/900,621 priority patent/US4645211A/en
Priority to JP61201915A priority patent/JPS6252399A/en
Priority to KR1019860007235A priority patent/KR930002783B1/en
Publication of EP0213229A1 publication Critical patent/EP0213229A1/en
Application granted granted Critical
Publication of EP0213229B1 publication Critical patent/EP0213229B1/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B6/00—Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns
    • F42B6/02—Arrows; Crossbow bolts; Harpoons for hand-held spring or air guns
    • F42B6/04—Archery arrows
    • F42B6/06—Tail ends, e.g. nocks, fletching
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B6/00—Projectiles or missiles specially adapted for projection without use of explosive or combustible propellant charge, e.g. for blow guns, bows or crossbows, hand-held spring or air guns
    • F42B6/02—Arrows; Crossbow bolts; Harpoons for hand-held spring or air guns

Definitions

  • the invention relates to a cam for arrows of sports and hunting bows according to the preamble of patent claim 1.
  • the cam attached to the end of the shaft of the arrows of sports and hunting bows serves to place the arrow on the bow of the bow, the cam engaging around the bow with its two cam wings.
  • two frets are usually attached to the tendon, between which the nock is placed on the tendon.
  • the archer grasps the tendon either with the index finger above the nock point and with the middle and ring finger below the nock point or with the so-called undergrip only below the nock point.
  • the point of maximum deflection of the tendon is below the nock point.
  • the tendon is tilted at an angle of up to 30 ° in the area of the nock point relative to the base of the channel formed by the nock wings, which is perpendicular to the arrow axis.
  • a cam is known in which the groove formed between the cam wings has a width, at least at its base, which is somewhat less than the diameter of the chord.
  • the cam sits on the tendon with slight clamping. If the bow is tensioned and the tendon is tilted against the bottom of the channel of the cam, the tendon on this cam will lift off the bottom of the channel. The cam therefore no longer sits exactly on the tendon when the bow is taut. If the shooter releases the chord to shoot the arrow, the chord strikes the bottom of the channel in an irregular manner, which leads to inaccuracies in the shooting of the arrow and to deviations from the target.
  • cam of the type mentioned is known.
  • locking projections are formed at the ends behind the base of the channel on the inside of the cam wings, which extend transversely to the arrow axis and parallel to the base of the channel. These locking projections narrow the channel so far that when the cam is placed on the base of the channel, the tendon engages with a small locking force in front of these locking projections. This locking effect holds the cam on the tendon. If the tendon is tilted when the bow is tensioned, it will tilt against the channel formed by the base of the channel and the locking projections, and there is a risk that the string will jump out of the locking.
  • the arrow then sits with its nock no longer defined on the nock point of the tendon and can even fall off the tendon.
  • the base of the channel is convexly curved against its circumferential ends in order to ensure that the nocking point of the tendon lies precisely against the base of the channel of the cam even when the extended tendon is tilted.
  • this spherical curvature of the base of the channel has the result that the tendon is only in point contact with the base of the channel. Because of this point-like contact, the arrow is not guided exactly from the nock point of the tendon, especially when it leaves the tendon when it is launched.
  • the two frets defining the nock point on the chord are generally at a mutual distance which corresponds to the diameter of the nock in order to define the nock point as precisely as possible.
  • Tilting of the extended tendon means that the upper collar in front of the channel presses on the cam from above, while the lower collar behind the bottom of the channel presses against the cam wing from below.
  • a tilting moment is exerted on the entire arrow, which presses the arrow shaft against its support on the bow. This tilting moment affects the accuracy of the shot.
  • the pressure exerted on the cam by the collars can even cause the cam to break off the arrow shaft.
  • the invention has for its object to provide a cam which is reliably held at any time on the nock point of the tendon when the tendon is pulled out for tensioning the bow and when the arrow is fired, and in which the nock point of the tendon for exact guidance of the arrow abuts the bottom of the channel of the cam at all times.
  • the base of the channel, against which the nock point of the bowstring rests, and the latching projections of the cam flaps are asymmetrical.
  • the asymmetrical beveling of the base of the channel and the locking projections allows the tendon to tilt when the bow is tensioned, without the nocking point of the tendon pressing on the cam and exerting a tipping moment on the arrow and without the tendon being able to come loose from the catch.
  • the base of the groove Since the inclination is formed only on a peripheral end portion of the base of the groove, the base of the groove has a sufficiently large section running perpendicular to the arrow axis so that the tendon when the arrow is fired at the moment when the cam detaches from the tendon , has a sufficiently large contact surface at the bottom of the channel of the cam. This large contact surface ensures good power transmission from the tendon to the arrow and in particular an important one for the accuracy exact guidance of the arrow on the tendon at the moment of launch.
  • the design of the locking projections ensures that the nocking point of the tendon always snaps into the base of the groove of the cam during the entire process of pulling out the tendon and firing the arrow and cannot come loose from the locking. During the entire process, the nocking point of the tendon does not move away from the base of the channel at any time, so that an undefined position of the nocking point relative to the nock cannot impair the accuracy of the launch.
  • the inclined end sections of the base of the channel and the locking projections preferably extend over less than half the diametrical dimension of the channel and in particular in each case approximately over a third of this diametrical dimension.
  • the bottom of the trough and the locking projections run parallel to one another and perpendicular to the arrow axis in the central region over approximately a third of the diametrical dimension of the trough, so that the arrow at the moment of firing when the cam detaches from the tendon is exactly perpendicular to the Tendon is guided.
  • annular recesses are provided, which have a larger radius than the radius of the base of the channel and are arranged in a plane perpendicular to the direction of inclination of the inclined end sections. These recesses serve to accommodate the frets that define the nock point on the tendon when the tendon is tilted in its maximum deflection. Even if the frets are at a mutual distance that only corresponds to the diameter of the cam, these frets do not exert any pressure on the cam when the chord is tilted, which could adversely affect the accuracy of the arrow's flying or cause the cam to break off the arrow shaft.
  • the frets defining the nock point can therefore be arranged with the smallest possible distance corresponding to the diameter of the nock, which enables a precise placement of the nock on the tendon which is decisive for the accuracy of the hit.
  • the collar engaging in the recess of the locking projections in particular also prevents the nocking point from jumping out of the locking when the tendon is tilted.
  • the cam wings have a constant small wall thickness in the region of the base of the channel up to the latching projections, which causes elastic spring properties of the cam wings, the cam wings give way both when the tendon is inserted into the channel and when the arrow is fired if the cam detaches itself from the tendon, elastically outwards.
  • the nock is not held under clamping action on the nocking point of the tendon, but grips it elastically.
  • the cam is particularly suitable for the use of a rigid sleeve which is placed on the tendon and forms the nock point.
  • the locking of the nock point of the tendon in the base of the channel of the cam without clamping action also has the advantage over conventional nocks with clamping action that there is no significant wear of the cam wings. Such wear would affect the target accuracy because it changes the friction and force relationships between the cam and the nock point.
  • the frustoconical tapered cam body has the advantage that the cam overall has a smaller axial end face on which a subsequent arrow can strike during a so-called robin hood shot and destroy the cam and the arrow. If a subsequent arrow hits the side surfaces of the cam body which are bevelled in the shape of a truncated cone, this generally does not result in damage to the cam and, moreover, the following arrow is also deflected less strongly from the target.
  • the formation of the cam body with a square cross-section in the area of the transition to the cam lobes enables the formation of the cam lobes with a constant low wall thickness, without the risk of breakage at the transition from the cam body to the cam lobes.
  • the cam is expediently made of a plastic material with high strength in order to exclude breakage and wear as far as possible, with high elasticity in order to ensure easy engagement and disengagement of the tendon, and with good sliding properties to enable the cam to be detached from the tendon easily and with little wear to reach.
  • Polyoximethylene for example, advantageously meets this requirement.
  • Polyamide and polycarbonate are also suitable for this purpose.
  • the cam shown in the drawing has a cam body 10, which has a circular cross section at its arrow shaft end with an outside diameter that corresponds to the outside diameter of the arrow shaft 12.
  • a coaxial cylindrical extension 14 adjoins the arrow shaft end of the cam body 10, the outside diameter of which corresponds to the inside diameter of the arrow shaft.
  • the cam can be inserted with the extension 14 into the hollow end of the arrow shaft 12, the cam being flush with the arrow shaft 14 on the outer circumference and being aligned axially with the arrow shaft 12.
  • the approach 14 is hollow into the cam body 10 in order to save material and weight and to enable an exact shaping.
  • the cam body 10 With 4 flat side surfaces in the form of a truncated pyramid tapers towards the cam end. In the area of the flat side surfaces, the cam body 10 has an essentially square cross section. Two of the opposite side surfaces 16 run at an angle of approximately 10 ° and merge into axially parallel flat side surfaces 18. The two other opposite side surfaces 20 extend at a somewhat smaller angle of approximately 6 ° to the rear end of the cam body 10.
  • cam lobes 22 are integrally formed on the rear end of the cam body 10.
  • the cam wings 22 enclose between them a channel 24 which runs diametrically to the arrow axis and which is used to insert the bowstring or a sleeve fastened to the bowstring and forming the nock point.
  • the groove 24 is formed on its base 26 with a circular cross section, which corresponds to the cross section of the bowstring or the sleeve forming the nocking point.
  • On the mutually facing inner surfaces of the cam 22 there are locking projections 28 which run parallel to the base 26 of the channel 24.
  • the circular circumference of the base 26 of the channel 24 is closed over a little more than half the circumference of the circle, so that the locking projections 28 result in a narrowing of the channel 24, the clear width of which is somewhat smaller than the diameter of the bowstring or is the sleeve forming the nock point.
  • the channel 24 widens in the shape of a funnel in the region 30 adjoining this constriction.
  • the flat side surfaces 20 of the cam body merge with a constant width into the outer side surfaces of the cam wing 22.
  • the width (in the direction of the bow chord) of the cam flaps 22 decreases, so that the side edges taper towards one another at an angle of approximately 15 ° to the axial direction, as shown in FIG. 2.
  • the ends of the cam 22 are bluntly rounded.
  • the base 26 is inclined forward toward the arrow shaft 12.
  • the inclined end section 32 extends over approximately one third of the total diametrical extension of the base 26 of the channel 24, as can be seen from FIG. 2.
  • the end section 32 is inclined at an angle of approximately 30 ° with respect to the base 26 of the channel 24, which is perpendicular to the arrow axis
  • the locking projections 28 of the cam lobes 22 are formed at the opposite, lower end in FIG. 2 of the circumferential end inclined towards the end of the cam.
  • the inclined end section 34 of the locking projections 28 extends over approximately half the total diametrical extension of the locking projections 28, as shown in FIG. 2.
  • the angle of inclination of the inclined end sections 34 with respect to the locking projections 28 running perpendicular to the arrow axis is likewise approximately 30 °.
  • annular recess 36 is provided, the diameter of which is larger than the diameter of the base 26 and which is arranged in a plane perpendicular to the inclined end portion 32.
  • a circular recess 38 is also provided, which has the same diameter as the recess 36 and is arranged in the plane perpendicular to the inclined end section 34. The mutual distance of the recesses 36 and 38 perpendicular to their plane corresponds to the diameter of the cam and thus the distance of the frets defining the nock point of the tendon.
  • the entire cam is injection molded in one piece from thermoplastic.
  • a rigid sleeve 40 is fastened by means of a thread winding 42 to fix the nocking point on which the nock is placed.
  • the sleeve 40 has two frets 44, the spacing of which corresponds to the diameter of the cam body 10 in the region of Bottom 26 of the groove 24 corresponds, so that an exact positioning of the arrow on the tendon is guaranteed.
  • the diameter of the sleeve 40 corresponds to the diameter of the base 26 of the channel 24.
  • the sleeve 40 engages in the base 26 of the channel 24 and is held in the base 26 of the channel 24 by the locking projections 28.
  • the cam wings 22 are slightly elastically bent apart. The sleeve 40 then assumes the position shown in FIG. 4.
  • the tendon cant in the area of the nocking point by up to 30 ° with respect to the original position perpendicular to the arrow axis.
  • the rigid sleeve 40 which defines the nocking point, is tilted by up to 30 ° with respect to the base 26 of the channel 24, which is perpendicular to the arrow axis.
  • the inclined end sections 32 of the base 26 and 34 of the locking projections 28 enable this tilting without the Sleeve 40 of the nocking point detaches from the base of the channel 24 and without the sleeve 40 jumping out of the locking projections 28 to the rear.
  • the collars 44 of the sleeve 40 lie in the recesses 36 and 38, so that the collars 44 do not exert any pressure on the cam which would cause a tilting moment acting on the arrow.
  • the sleeve 40 of the nock point remains at the moment during the entire process of accelerating the arrow, in which the tendon extends from the position of maximum deflection shown in FIG. 5 to the position shown in FIG. 4 of the launch moves, always lying against the base 26 of the channel 24 and is always held against the base 26 by the locking projections 28.
  • there can be no undefined positional relationship between the nock point of the tendon and the nock of the arrow which could lead to an inaccuracy. As shown in FIG.

Abstract

A nock for arrows is disclosed. This nock is formed so that at all times during spanning of the bow and firing of the arrow, the nock-location section of the bowstring will be received in the nock so that the collar lies evenly against the bottom of the furrow of the nock for accurate firing of the arrow.

Description

Die Erfindung betrifft einen Nock für Pfeile von Sport- und Jagdbögen gemäss dem Oberbegriff des Patentanspruchs 1.The invention relates to a cam for arrows of sports and hunting bows according to the preamble of patent claim 1.

Der an dem Ende des Schaftes der Pfeile von Sport- und Jagdbögen befestigte Nock dient dazu, den Pfeil auf die Sehne des Bogens aufzusetzen, wobei der Nock die Sehne mit seinen beiden Nockflügeln umgreift. Um den Nockpunkt auf der Sehne festzulegen, an welchem der Pfeil auf die Sehne aufgesetzt werden muss, sind in der Regel zwei Bünde an der Sehne angebracht, zwischen denen der Nock auf die Sehne aufgesetzt wird.The cam attached to the end of the shaft of the arrows of sports and hunting bows serves to place the arrow on the bow of the bow, the cam engaging around the bow with its two cam wings. In order to determine the nock point on the tendon at which the arrow must be placed on the tendon, two frets are usually attached to the tendon, between which the nock is placed on the tendon.

Zum Spannen des Bogens ergreift der Bogenschütze die Sehne entweder mit dem Zeigefinger oberhalb des Nockpunktes und mit Mittel- und Ringfinger unterhalb des Nockpunktes oder beim sogenannten Untergriff nur unterhalb des Nockpunktes. In jedem Fall befindet sich beim Spannen des Bogens der Punkt der maximalen Auslenkung der Sehne unterhalb des Nockpunktes. Die Sehne ist dadurch im Bereich des Nockpunktes gegenüber dem senkrecht zur Pfeilachse verlaufenden Grund der von den Nockflügeln gebildeten Rinne um einen Winkel von bis zu 30° verkantet. Beim Abschuss des Pfeiles verlässt dieser die Sehne, wenn diese von dem Schützen losgelassen ist und ihre normale entspannte Lage erreicht, in welcher die Sehne parallel zum Grund der Rinne des Nocks verläuft.To tension the bow, the archer grasps the tendon either with the index finger above the nock point and with the middle and ring finger below the nock point or with the so-called undergrip only below the nock point. In any case, when the bow is tensioned, the point of maximum deflection of the tendon is below the nock point. As a result, the tendon is tilted at an angle of up to 30 ° in the area of the nock point relative to the base of the channel formed by the nock wings, which is perpendicular to the arrow axis. When the arrow is fired, it leaves the tendon when it is released by the shooter and reaches its normal relaxed position, in which the tendon runs parallel to the base of the groove of the cam.

Es ist ein Nock bekannt, bei welchem die zwischen den.Nockflügeln gebildete Rinne zumindest an ihrem Grund eine Breite aufweist, die etwas geringer ist als der Durchmesser der Sehne. Der Nock sitzt dadurch mit leichter Klemmung auf der Sehne. Wenn der Bogen gespannt wird und sich somit die Sehne gegen den Grund der Rinne des Nocks verkantet, hebt sich bei diesem Nock die Sehne vom Grund der Rinne ab. Der Nock sitzt daher bei gespanntem Bogen nicht mehr exakt auf der Sehne. Wird die Sehne zum Abschuss des Pfeils von dem Schützen freigegeben, so schlägt die Sehne in unregelmässiger Weise gegen den Grund der Rinne, was zu Ungenauigkeiten im Abschuss des Pfeiles und zu Zielabweichungen führt.A cam is known in which the groove formed between the cam wings has a width, at least at its base, which is somewhat less than the diameter of the chord. As a result, the cam sits on the tendon with slight clamping. If the bow is tensioned and the tendon is tilted against the bottom of the channel of the cam, the tendon on this cam will lift off the bottom of the channel. The cam therefore no longer sits exactly on the tendon when the bow is taut. If the shooter releases the chord to shoot the arrow, the chord strikes the bottom of the channel in an irregular manner, which leads to inaccuracies in the shooting of the arrow and to deviations from the target.

Aus dem DE-U-8305301 ist ein Nock der eingangs genannten Gattung bekannt. Bei diesem Nock sind endseitig hinter dem Grund der Rinne an der Innenseite der Nockflügel Rastvorsprünge ausgebildet, die quer zur Pfeilachse und parallel zum Grund der Rinne verlaufen. Diese Rastvorsprünge verengen die Rinne so weit, dass die Sehne beim Aufsetzen des Nocks am Grund der Rinne vor diesen Rastvorsprüngen mit einer geringen Rastkraft einrastet. Diese Rastwirkung hält den Nock auf der Sehne fest. Wird die Sehne beim Spannen des Bogens verkantet, so verkantet sie sich gegen den von dem Grund der Rinne und den Rastvorsprüngen gebildeten Kanal, und es besteht die Gefahr, dass die Sehne aus der Rastung herausspringt. Der Pfeil sitzt dann mit seinem Nock nicht mehr definiert auf dem Nockpunkt der Sehne und kann sogar von der Sehne herunterfallen. Bei dem Nock gemäss dem DE-U-8305301 ist der Grund der Rinne gegen deren umfangsseitige Enden ballig gewölbt, um ein exaktes Anliegen des Nockpunktes der Sehne am Grund der Rinne des Nocks auch bei dem Verkanten der ausgezogenen Sehne zu gewährleisten. Diese ballige Wölbung des Grundes der Rinne hat jedoch zur Folge, dass die Sehne nur jeweils punktförmig mit dem Grund der Rinne in Berührung steht. Auf Grund dieser punktförmigen Berührung wird der Pfeil insbesondere in dem Moment, wenn er beim Abschuss die Sehne verlässt, nicht exakt vom Nockpunkt der Sehne geführt.From DE-U-8305301 a cam of the type mentioned is known. In the case of this cam, locking projections are formed at the ends behind the base of the channel on the inside of the cam wings, which extend transversely to the arrow axis and parallel to the base of the channel. These locking projections narrow the channel so far that when the cam is placed on the base of the channel, the tendon engages with a small locking force in front of these locking projections. This locking effect holds the cam on the tendon. If the tendon is tilted when the bow is tensioned, it will tilt against the channel formed by the base of the channel and the locking projections, and there is a risk that the string will jump out of the locking. The arrow then sits with its nock no longer defined on the nock point of the tendon and can even fall off the tendon. In the case of the cam according to DE-U-8305301, the base of the channel is convexly curved against its circumferential ends in order to ensure that the nocking point of the tendon lies precisely against the base of the channel of the cam even when the extended tendon is tilted. However, this spherical curvature of the base of the channel has the result that the tendon is only in point contact with the base of the channel. Because of this point-like contact, the arrow is not guided exactly from the nock point of the tendon, especially when it leaves the tendon when it is launched.

Die beiden den Nockpunkt auf der Sehne festlegenden Bünde weisen in der Regel einen gegenseitigen Abstand auf, der dem Durchmesser des Nocks entspricht, um den Nockpunkt möglichst exakt zu definieren. Das Verkanten der ausgezogenen Sehne hat dabei zur Folge, dass der obere Bund vor der Rinne von oben auf den Nock drückt, während der untere Bund hinter dem Grund der Rinne von unten gegen die Nockflügel drückt. Dadurch wird auf den gesamten Pfeil ein Kippmoment ausgeübt, das den Pfeilschaft gegen seine Auflage am Bogen drückt. Dieses Kippmoment beeinträchtigt die Genauigkeit des Schusses. Unter Umständen kann der durch die Bünde auf den Nock ausgeübte Druck sogar zu einem Abbrechen des Nocks vom Pfeilschaft führen.The two frets defining the nock point on the chord are generally at a mutual distance which corresponds to the diameter of the nock in order to define the nock point as precisely as possible. Tilting of the extended tendon means that the upper collar in front of the channel presses on the cam from above, while the lower collar behind the bottom of the channel presses against the cam wing from below. As a result, a tilting moment is exerted on the entire arrow, which presses the arrow shaft against its support on the bow. This tilting moment affects the accuracy of the shot. Under certain circumstances, the pressure exerted on the cam by the collars can even cause the cam to break off the arrow shaft.

Der Erfindung liegt die Aufgabe zugrunde, einen Nock zu schaffen, der beim Ausziehen der Sehne zum Spannen des Bogens und beim Abschuss des Pfeiles zu jedem Zeitpunkt zuverlässig auf dem Nockpunkt der Sehne gehalten wird und bei dem der Nockpunkt der Sehne für eine exakte Führung des Pfeiles zu jedem Zeitpunkt am Grund der Rinne des Nocks anliegt.The invention has for its object to provide a cam which is reliably held at any time on the nock point of the tendon when the tendon is pulled out for tensioning the bow and when the arrow is fired, and in which the nock point of the tendon for exact guidance of the arrow abuts the bottom of the channel of the cam at all times.

Diese Aufgabe wird bei einem Nock der eingangs genannten Gattung erfindungsgemäss gelöst durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1.This object is achieved according to the invention in a cam of the type mentioned at the outset by the features of the characterizing part of patent claim 1.

Vorteilhafte Ausführungsformen und Weiterbildungen der Erfindung sind in den abhängigen Ansprüchen angegeben.Advantageous embodiments and developments of the invention are specified in the dependent claims.

Bei dem erfindungsgemässen Nock sind der Grund der Rinne, an welchem der Nockpunkt der Bogensehne anliegt, und die Rastvorsprünge der Nockflügel asymmetrisch ausgebildet. Die asymmetrische Abschrägung des Grundes der Rinne und der Rastvorsprünge erlaubt ein Verkanten der Sehne beim Spannen des Bogens, ohne dass der Nockpunkt der Sehne auf den Nock drückt und ein Kippmoment auf den Pfeil ausübt und ohne dass die Sehne sich aus der Rastung lösen kann. Da die Neigung nur an einem umfangsseitigen Endabschnitt des Grundes der Rinne ausgebildet ist, weist der Grund der Rinne einen ausreichend grossen senkrecht zur Pfeilachse verlaufenden Abschnitt auf, so dass die Sehne beim Abschuss des Pfeiles in dem Moment, wenn sich der Nock von der Sehne löst, eine ausreichend grosse Anlagefläche am Grund der Rinne des Nocks hat. Diese grosse Anlagefläche gewährleistet eine gute Kraftübertragung von der Sehne auf den Pfeil und insbesondere eine für die Treffgenauigkeit wichtige exakte Führung des Pfeils auf der Sehne im Moment des Abschusses. Die Gestaltung der Rastvorsprünge gewährleistet, dass der Nockpunkt der Sehne während des gesamten Vorganges des Auszugs der Sehne und des Abschusses des Pfeils stets eingerastet am Grund der Rinne des Nocks anliegt und sich nicht aus der Rastung lösen kann. Der Nockpunkt der Sehne entfernt sich somit während des gesamten Vorgangs zu keinem Zeitpunkt von dem Grund der Rinne, so dass keine die Genauigkeit des Abschusses beeinträchtigende undefinierte Lage des Nockpunktes gegenüber dem Nock eintreten kann.In the case of the cam according to the invention, the base of the channel, against which the nock point of the bowstring rests, and the latching projections of the cam flaps are asymmetrical. The asymmetrical beveling of the base of the channel and the locking projections allows the tendon to tilt when the bow is tensioned, without the nocking point of the tendon pressing on the cam and exerting a tipping moment on the arrow and without the tendon being able to come loose from the catch. Since the inclination is formed only on a peripheral end portion of the base of the groove, the base of the groove has a sufficiently large section running perpendicular to the arrow axis so that the tendon when the arrow is fired at the moment when the cam detaches from the tendon , has a sufficiently large contact surface at the bottom of the channel of the cam. This large contact surface ensures good power transmission from the tendon to the arrow and in particular an important one for the accuracy exact guidance of the arrow on the tendon at the moment of launch. The design of the locking projections ensures that the nocking point of the tendon always snaps into the base of the groove of the cam during the entire process of pulling out the tendon and firing the arrow and cannot come loose from the locking. During the entire process, the nocking point of the tendon does not move away from the base of the channel at any time, so that an undefined position of the nocking point relative to the nock cannot impair the accuracy of the launch.

Die geneigten Endabschnitte des Grundes der Rinne und der Rastvorsprünge erstrecken sich vorzugsweise über weniger als die Hälfte der diametralen Abmessung der Rinne und insbesondere jeweils etwa über ein Drittel dieser diametralen Abmessung. Dadurch verlaufen im mittleren Bereich über etwa ein Drittel der diametralen Abmessung der Rinne der Grund der Rinne und die Rastvorsprünge parallel zueinander und senkrecht zur Pfeilachse, so dass der Pfeil im Moment des Abschusses, wenn sich der Nock von der Sehne löst, exakt senkrecht zu der Sehne geführt ist.The inclined end sections of the base of the channel and the locking projections preferably extend over less than half the diametrical dimension of the channel and in particular in each case approximately over a third of this diametrical dimension. As a result, the bottom of the trough and the locking projections run parallel to one another and perpendicular to the arrow axis in the central region over approximately a third of the diametrical dimension of the trough, so that the arrow at the moment of firing when the cam detaches from the tendon is exactly perpendicular to the Tendon is guided.

An dem umfangsseitigen geneigten Ende des Grundes der Rinne und an den umfangsseitig geneigten Enden der Rastvorsprünge sind jeweils kreisringförmige Ausnehmungen vorgesehen, die einen gegenüber dem Radius des Grundes der Rinne vergrösserten Radius aufweisen und in einer zu der Neigungsrichtung der geneigten Endabschnitte senkrechten Ebene angeordnet sind. Diese Ausnehmungen dienen dazu, bei dem Verkanten der Sehne in deren maximaler Auslenkung die Bünde aufzunehmen, die den Nockpunkt auf der Sehne definieren. Auch wenn die Bünde einen gegenseitigen Abstand haben, der nur dem Durchmesser des Nocks entspricht, üben diese Bünde beim Verkanten der Sehne keinen Druck auf den Nock aus, der die Fluggenauigkeit des Pfeils nachteilig beeinflussen könnte oder ein Abbrechen des Nocks vom Pfeilschaft bewirken könnte. Die den Nockpunkt festlegenden Bünde können daher mit dem geringstmöglichen, dem Durchmesser des Nocks entsprechenden Abstand angeordnet werden, was ein für die Treffgenauigkeit entscheidendes exaktes Aufsetzen des Nocks auf die Sehne ermöglicht. Der in die Ausnehmung der Rastvorsprünge eingreifende Bund verhindert insbesondere auch ein Herausspringen des Nockpunktes aus der Rastung beim Verkanten der Sehne.At the circumferential inclined end of the base of the channel and at the circumferentially inclined ends of the locking projections, annular recesses are provided, which have a larger radius than the radius of the base of the channel and are arranged in a plane perpendicular to the direction of inclination of the inclined end sections. These recesses serve to accommodate the frets that define the nock point on the tendon when the tendon is tilted in its maximum deflection. Even if the frets are at a mutual distance that only corresponds to the diameter of the cam, these frets do not exert any pressure on the cam when the chord is tilted, which could adversely affect the accuracy of the arrow's flying or cause the cam to break off the arrow shaft. The frets defining the nock point can therefore be arranged with the smallest possible distance corresponding to the diameter of the nock, which enables a precise placement of the nock on the tendon which is decisive for the accuracy of the hit. The collar engaging in the recess of the locking projections in particular also prevents the nocking point from jumping out of the locking when the tendon is tilted.

Weisen die Nockflügel in einer bevorzugten Ausführungsform im Bereich des Grundes der Rinne bis zu den Rastvorsprüngen eine konstante geringe Wandstärke auf, die elastische Federeigenschaften der Nockflügel bewirkt, so weichen die Nockflügel sowohl beim Einlegen der Sehne in die Rinne als auch beim Abschiessen des Pfeiles, wenn sich der Nock von der Sehne löst, elastisch nach aussen aus. Der Nock wird dadurch nicht unter Klemmwirkung auf dem Nockpunkt der Sehne gehalten, sondern umgreift diese elastisch. Der Nock eignet sich dadurch insbesondere auch für die Verwendung einer auf die Sehne aufgesetzten, den Nockpunkt bildenden starren Hülse. Für die Kraft, mit welcher diese starre Hülse des Nockpunktes in dem Nock gehalten wird und für den Widerstand beim Ablösen des Nocks von dieser Hülse beim Abschuss ist nur der elastische Biegewiderstand der Nockflügel massgebend. Dieser elastische Biegewiderstand hängt sehr wenig von unvermeidlichen Fertigungstoleranzen ab. Dieser elastische Biegewiderstand wird ausserdem auch nur in dem Moment wirksam, in welchem die Sehne bzw. die auf der Sehne sitzende, den Nockpunkt bildende Hülse aus dem Grund der Rinne herausschnappt. Diese Einwirkung ist zeitlich sehr kurz und räumlich genau auf die Verengung der Rinne durch die Rastvorsprünge begrenzt. Es können daher keine undefinierten, die Rastgenauigkeit beeinträchtigenden Einflüsse beim Ablösen der Nock von der Sehne während des Abschusses auftreten. Dies ist ein wesentlicher Vorteil gegenüber herkömmlichen Nocks, die unter Klemmwirkung auf dem Nockpunkt der Sehne sitzen, indem die Breite der Rinne des Nocks geringfügig kleiner als der Durchmesser der Sehne gewählt ist.If, in a preferred embodiment, the cam wings have a constant small wall thickness in the region of the base of the channel up to the latching projections, which causes elastic spring properties of the cam wings, the cam wings give way both when the tendon is inserted into the channel and when the arrow is fired if the cam detaches itself from the tendon, elastically outwards. As a result, the nock is not held under clamping action on the nocking point of the tendon, but grips it elastically. As a result, the cam is particularly suitable for the use of a rigid sleeve which is placed on the tendon and forms the nock point. For the force with which this rigid sleeve of the nock point is held in the nock and for the resistance when detaching the nock from this sleeve during firing, only the elastic bending resistance of the nock wing is decisive. This elastic bending resistance depends very little on inevitable manufacturing tolerances. This elastic bending resistance is also only effective at the moment when the tendon or the sleeve seated on the tendon and forming the nocking point snaps out of the bottom of the channel. This effect is very short in time and spatially limited to the narrowing of the channel through the locking projections. Therefore, there can be no undefined influences that detract from the locking accuracy when the cam is detached from the tendon during the launch. This is a significant advantage over conventional nocks, which sit on the nock point of the tendon with a clamping effect, in that the width of the channel of the nock is selected to be slightly smaller than the diameter of the tendon.

Die Rastung des Nockpunkts der Sehne im Grund der Rinne des Nocks ohne Klemmwirkung hat gegenüber herkömmlichen Nocks mit Klemmwirkung auch den Vorteil, dass kein wesentlicher Verschleissder Nockflügel auftritt. Ein solcher Verschleiss würde die Zielgenauigkeit beeinflussen, da er die Reibungs- und Kraftverhältnisse zwischen dem Nock und dem Nockpunkt ändert.The locking of the nock point of the tendon in the base of the channel of the cam without clamping action also has the advantage over conventional nocks with clamping action that there is no significant wear of the cam wings. Such wear would affect the target accuracy because it changes the friction and force relationships between the cam and the nock point.

Der sich kegelstumpfförmig verjüngende Nockkörper hat den Vorteil, dass der Nock insgesamt eine geringere axiale endseitige Stirnfläche aufweist, auf die ein nachfolgender Pfeil bei einem sogenannten Robin-Hood-Schuss auftreffen und den Nock und den Pfeil zerstören kann. Trifft ein nachfolgender Pfeil auf die kegelstumpfförmig abgeschrägten Seitenflächen des Nockkörpers, so führt dies in der Regel nichtzu einer Beschädigung des Nocks und ausserdem wird der nachfolgende Pfeil insbesondere auch weniger stark aus dem Ziel abgelenkt.The frustoconical tapered cam body has the advantage that the cam overall has a smaller axial end face on which a subsequent arrow can strike during a so-called robin hood shot and destroy the cam and the arrow. If a subsequent arrow hits the side surfaces of the cam body which are bevelled in the shape of a truncated cone, this generally does not result in damage to the cam and, moreover, the following arrow is also deflected less strongly from the target.

Die Ausbildung des Nockkörpers mit quadratischem Querschnitt im Bereich des Übergangs zu den Nockflügeln ermöglicht die Ausbildung der Nockflügel mit konstanter geringer Wandstärke, ohne dass am Übergang vom Nockkörper zu den Nockflügeln bruchgefährdete Stellen auftreten.The formation of the cam body with a square cross-section in the area of the transition to the cam lobes enables the formation of the cam lobes with a constant low wall thickness, without the risk of breakage at the transition from the cam body to the cam lobes.

Der Nock besteht zweckmässigerweise aus einem Kunststoffmaterial mit hoher Festigkeit, um Bruch und Verschleiss möglichst auszuschliessen, mit hoher Elastizität, um ein leichtes Einrasten und Ausrasten der Sehne zu gewährleisten, und mit guten Gleiteigenschaften, um ein leichtes und verschleissarmes Ablösen des Nocks von der Sehne zu erreichen. Diese Forderung erfüllt beispielsweise Polyoximethylen in vorteilhafter Weise. Auch Polyamid und Polycarbonat eignen sich für diesen Zweck.The cam is expediently made of a plastic material with high strength in order to exclude breakage and wear as far as possible, with high elasticity in order to ensure easy engagement and disengagement of the tendon, and with good sliding properties to enable the cam to be detached from the tendon easily and with little wear to reach. Polyoximethylene, for example, advantageously meets this requirement. Polyamide and polycarbonate are also suitable for this purpose.

Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:

  • Fig. 1 eine teilweise axial geschnittene Draufsicht auf einen Nock gemäss der Erfindung,
  • Fig. 2 einen vertikalen Axialschnitt dieses Nocks,
  • Fig. 3 einen Schnitt längs der Linie A-A in Fig. 1,
  • Fig. 4 in vergrösserter Darstellung die Lage des Nockpunktes der Sehne in dem Nock in dem Moment, wenn sich der Pfeil beim Abschuss von der Sehne löst, und
  • Fig. 5 die Lage des Nockpunktes bei ausgezogener Sehne.
The invention is explained in more detail below with reference to an embodiment shown in the drawing. Show it:
  • 1 is a partially axially sectioned plan view of a cam according to the invention,
  • 2 shows a vertical axial section of this cam,
  • 3 shows a section along the line AA in FIG. 1,
  • Fig. 4 shows an enlarged view of the position of the nock point of the tendon in the nock at the moment when the arrow detaches from the tendon when it is fired, and
  • Fig. 5 shows the position of the nock point with the tendon extended.

Der in der Zeichnung dargestellte Nock weist einen Nockkörper 10 auf, der an seinem pfeilschaftseitigen Ende einen kreisförmigen Querschnitt mit einem Aussendurchmesser besitzt, der dem Aussendurchmesser des Pfeilschaftes 12 entspricht. An das pfeilschaftseitige Ende des Nockkörpers 10 schliesst sich koaxial ein kreiszylindrischer Ansatz 14 an, dessen Aussendurchmesser mit dem Innendurchmesser des Pfeilschaftes übereinstimmt. Der Nock kann mit dem Ansatz 14 passend in das hohle Ende des Pfeilschaftes 12 eingesetzt werden, wobei sich der Nock im Aussenumfang bündig an den Pfeilschaft 14 anschliesst und exakt axial fluchtend mit dem Pfeilschaft 12 ausgerichtet ist. Der Ansatz 14 ist bis in den Nockkörper 10 hinein hohl, um Material und' Gewicht einzusparen und eine exakte Formgebung zu ermöglichen.The cam shown in the drawing has a cam body 10, which has a circular cross section at its arrow shaft end with an outside diameter that corresponds to the outside diameter of the arrow shaft 12. A coaxial cylindrical extension 14 adjoins the arrow shaft end of the cam body 10, the outside diameter of which corresponds to the inside diameter of the arrow shaft. The cam can be inserted with the extension 14 into the hollow end of the arrow shaft 12, the cam being flush with the arrow shaft 14 on the outer circumference and being aligned axially with the arrow shaft 12. The approach 14 is hollow into the cam body 10 in order to save material and weight and to enable an exact shaping.

Von dem pfeilschaftseitigen Ende mit kreisförmigem Querschnitt ausgehend läuft der Nockkörper 10 mit 4 ebenen Seitenflächen in Form eines Pyramidenstumpfes sich verjüngend gegen das Nockende zu. Im Bereich der ebenen Seitenflächen weist der Nockkörper 10 einen im wesentlichen quadratischen Querschnitt auf. Zwei der einander gegenüberliegenden Seitenflächen 16 verlaufen unter einem Winkel von etwa 10° und gehen in achsparalleie ebene Seitenflächen 18 über. Die beiden anderen einander gegenüberliegenden Seitenflächen 20 verlaufen unter einem etwas kleineren Winkel von etwa 6° bis an das hintere Ende des Nockkörpers 10.Starting from the arrow shaft end with a circular cross section, the cam body 10 with 4 flat side surfaces in the form of a truncated pyramid tapers towards the cam end. In the area of the flat side surfaces, the cam body 10 has an essentially square cross section. Two of the opposite side surfaces 16 run at an angle of approximately 10 ° and merge into axially parallel flat side surfaces 18. The two other opposite side surfaces 20 extend at a somewhat smaller angle of approximately 6 ° to the rear end of the cam body 10.

An das hintere Ende des Nockkörpers 10 sind zwei Nockflügel 22 angeformt. Die Nockflügel 22 schliessen zwischen sich eine quer zur Pfeilachse, diametral verlaufende Rinne 24 ein, die zum Einlegen der Bogensehne bzw. einer auf der Bogensehne befestigten, den Nockpunkt bildenden Hülse dient. Die Rinne 24 ist an ihrem Grund 26 mit einem kreisförmigen Querschnitt ausgebildet, der dem Querschnitt der Bogensehne bzw. der den Nockpunkt bildenden Hülse entspricht. An den einanderzugewandten Innenflächen der Nockflügel 22 sind jeweils Rastvorsprünge 28 vorgesehen, die parallel zum Grund 26 der Rinne 24 verlaufen. Durch die Rastvorsprünge 28 ist der kreisförmige Umfang des Grundes 26 der Rinne 24 über etwas mehr als den halben Kreisumfang geschlossen, so dass sich durch die Rastvorsprünge 28 eine Verengung der Rinne 24 ergibt, deren lichte Breite etwas kleiner als der Durchmesser der Bogensehne bzw. der den Nockpunkt bildenden Hülse ist. In dem sich hinter dieser Verengung anschliessenden Bereich 30 verbreitert sich die Rinne 24 trichterförmig.Two cam lobes 22 are integrally formed on the rear end of the cam body 10. The cam wings 22 enclose between them a channel 24 which runs diametrically to the arrow axis and which is used to insert the bowstring or a sleeve fastened to the bowstring and forming the nock point. The groove 24 is formed on its base 26 with a circular cross section, which corresponds to the cross section of the bowstring or the sleeve forming the nocking point. On the mutually facing inner surfaces of the cam 22 there are locking projections 28 which run parallel to the base 26 of the channel 24. By the locking projections 28, the circular circumference of the base 26 of the channel 24 is closed over a little more than half the circumference of the circle, so that the locking projections 28 result in a narrowing of the channel 24, the clear width of which is somewhat smaller than the diameter of the bowstring or is the sleeve forming the nock point. The channel 24 widens in the shape of a funnel in the region 30 adjoining this constriction.

Die Nockflügel 22, die im Bereich des Grundes 26 der Rinne 24 an dem Nockkörper 10 ansetzen, weisen im Bereich des Grundes 26 bis in den Bereich der Rastvorsprünge 28 eine im wesentlichen konstante geringe Wandstärke von etwa 1 mm auf, wie aus den Fig. 1 und 3 zu erkennen ist. Die ebenen Seitenflächen 20 des Nockkörpers gehen mit konstanter Breite in die äusseren Seitenflächen der Nockflügel 22 über. Etwa ab der Mitte des kreisförmigen Grundes 26 der Rinne 24 nimmt die Breite (in Richtung der Bogensehne) der Nockflügel 22 ab, so dass die Seitenkanten unter einem Winkel von etwa 15° gegen die Achsrichtung konisch aufeinander zulaufen, wie Fig. 2 zeigt. Die Enden der Nockflügel 22 sind stumpf abgerundet.The cam lobes 22, which attach to the cam body 10 in the region of the base 26 of the channel 24, have an essentially constant small wall thickness of approximately 1 mm in the region of the base 26 up to the region of the latching projections 28, as shown in FIG. 1 and 3 can be seen. The flat side surfaces 20 of the cam body merge with a constant width into the outer side surfaces of the cam wing 22. Approximately from the center of the circular base 26 of the channel 24, the width (in the direction of the bow chord) of the cam flaps 22 decreases, so that the side edges taper towards one another at an angle of approximately 15 ° to the axial direction, as shown in FIG. 2. The ends of the cam 22 are bluntly rounded.

In dem in Fig. 2 oberen umfangsseitigen Endabschnitt des Grundes 26 der Rinne 24 ist der Grund 26 nach vorn auf den Pfeilschaft 12 zu geneigt. Der geneigte Endabschnitt 32 erstreckt sich etwa über ein Drittel der gesamten diametralen Erstreckung des Grundes 26 der Rinne 24, wie aus Fig. 2 zu erkennen ist. Der Endabschnitt 32 ist unter einem WinkeI von etwa 30° gegenüber dem senkrechtzur Pfeilachse verlaufenden Grund 26 der Rinne 24 geneigtIn the upper peripheral end portion of the base 26 of the channel 24 in FIG. 2, the base 26 is inclined forward toward the arrow shaft 12. The inclined end section 32 extends over approximately one third of the total diametrical extension of the base 26 of the channel 24, as can be seen from FIG. 2. The end section 32 is inclined at an angle of approximately 30 ° with respect to the base 26 of the channel 24, which is perpendicular to the arrow axis

Die Rastvorsprünge 28 der Nockflügel 22 sind an dem entgegengesetzten, in Fig. 2 unteren umfangsseitigen Ende gegen das Ende des Nocks geneigt ausgebildet. Der geneigte Endabschnitt 34 der Rastvorsprünge28 erstreckt sich über etwa die halbe diametrale Gesamterstreckung der Rastvorsprünge 28, wie Fig. 2 zeigt. Der Neigungswinkel der geneigten Endabschnitte 34 gegenüber den senkrecht zur Pfeilachse verlaufenden Rastvorsprüngen 28 beträgt ebenfalls etwa 30°.The locking projections 28 of the cam lobes 22 are formed at the opposite, lower end in FIG. 2 of the circumferential end inclined towards the end of the cam. The inclined end section 34 of the locking projections 28 extends over approximately half the total diametrical extension of the locking projections 28, as shown in FIG. 2. The angle of inclination of the inclined end sections 34 with respect to the locking projections 28 running perpendicular to the arrow axis is likewise approximately 30 °.

Am umfangsseitigen Ende des geneigten Endabschnittes 32 des Grundes 26 der Rinne 24 ist eine kreisringförmige Ausnehmung 36 vorgesehen, deren Durchmesser grösser als der Durchmesser des Grundes 26 ist und die in einer zu dem geneigten Endabschnitt 32 senkrechten Ebene angeordnet ist. Am umfangsseitigen Ende des geneigten Endabschnittes 34 der Rastvorsprünge 28 ist ebenfalls eine kreisförmige Ausnehmung 38 vorgesehen, die den gleichen Durchmesser wie die Ausnehmung 36 aufweist und in der zu dem geneigten Endabschnitt 34 senkrechten Ebene angeordnet ist. Der gegenseitige Abstand der Ausnehmungen 36 und 38 senkrecht zu ihrer Ebene entspricht dem Durchmesser des Nocks und somit dem Abstand der den Nockpunkt der Sehnefestlegenden Bünde.At the peripheral end of the inclined end portion 32 of the base 26 of the channel 24, an annular recess 36 is provided, the diameter of which is larger than the diameter of the base 26 and which is arranged in a plane perpendicular to the inclined end portion 32. At the peripheral end of the inclined end section 34 of the locking projections 28, a circular recess 38 is also provided, which has the same diameter as the recess 36 and is arranged in the plane perpendicular to the inclined end section 34. The mutual distance of the recesses 36 and 38 perpendicular to their plane corresponds to the diameter of the cam and thus the distance of the frets defining the nock point of the tendon.

Der gesamte Nock ist einstückig aus thermoplastischem Kunststoff gespritzt.The entire cam is injection molded in one piece from thermoplastic.

Die Fig. 4 und 5, die eine etwa im Massstab 1 : 10 vergrösserte Darstellung zeigen, erläutern die Funktion des Nocks.4 and 5, which show a representation enlarged on a scale of 1:10, explain the function of the cam.

Auf der nicht sichtbaren Sehne des Bogens ist zur Festlegung des Nockpunktes, auf den der Nock aufgesetzt wird, eine starre Hülse 40 mittels einer Fadenwicklung 42 befestigt Die Hülse 40 weist zwei Bünde 44 auf, deren Abstand dem Durchmesser des Nockkörpers 10 im Bereich des Grundes 26 der Rinne 24 entspricht, so dass eine exakte Positionierung des Pfeils auf der Sehne gewährleistet ist. Der Durchmesser der Hülse 40 entspricht dem Durchmesser des Grundes 26 der Rinne 24.On the non-visible chord of the bow, a rigid sleeve 40 is fastened by means of a thread winding 42 to fix the nocking point on which the nock is placed. The sleeve 40 has two frets 44, the spacing of which corresponds to the diameter of the cam body 10 in the region of Bottom 26 of the groove 24 corresponds, so that an exact positioning of the arrow on the tendon is guaranteed. The diameter of the sleeve 40 corresponds to the diameter of the base 26 of the channel 24.

Wird der Pfeil mit dem Nock auf die Sehne aufgesetzt, so rastet die Hülse 40 in dem Grund 26 der Rinne 24 ein und wird durch die Rastvorsprünge 28 im Grund 26 der Rinne 24 gehalten. Zum Einrasten der Hülse 40 werden die Nockflügel 22 geringfügig elastisch auseinandergebogen. Die Hülse 40 nimmt dann die in Fig. 4 dargestellte Lage ein.If the arrow with the cam is placed on the tendon, the sleeve 40 engages in the base 26 of the channel 24 and is held in the base 26 of the channel 24 by the locking projections 28. To lock the sleeve 40, the cam wings 22 are slightly elastically bent apart. The sleeve 40 then assumes the position shown in FIG. 4.

Wird zum Spannen des Bogens die Sehne ausgelenkt, wobei die Finger des Bogenschützens überwiegend oder ausschliesslich unterhalb des Nockpunktes an der Sehne angreifen, so verkantet sich die Sehne im Bereich des Nockpunktes um bis zu 30° gegenüber der ursprünglichen zur Pfeilachse senkrechten Stellung. Dies ist in Fig. 5 dargestellt. Die starre Hülse 40, die den Nockpunkt definiert, verkantet sich dabei um bis zu 30° gegenüber dem senkrecht zur Pfeilachse verlaufenden Grund 26 der Rinne 24. Die geneigten Endabschnitte 32 des Grundes 26 und 34 der Rastvorsprünge 28 ermöglichen dieses Verkanten, ohne dass sich die Hülse 40 des Nockpunktes vom Grund der Rinne 24 löst und ohne dass die Hülse 40 nach hinten aus den Rastvorsprüngen 28 herausspringt. Die Bünde 44 der Hülse 40 legen sich bei diesem Verkanten der Sehne in die Ausnehmungen 36 und 38, so dass die Bünde 44 keinen Druck auf den Nock ausüben, der ein auf den Pfeil wirkendes Kippmoment verursachen würde.If the tendon is deflected to tension the bow, the fingers of the archer attacking the tendon predominantly or exclusively below the nocking point, the tendon cant in the area of the nocking point by up to 30 ° with respect to the original position perpendicular to the arrow axis. This is shown in FIG. 5. The rigid sleeve 40, which defines the nocking point, is tilted by up to 30 ° with respect to the base 26 of the channel 24, which is perpendicular to the arrow axis. The inclined end sections 32 of the base 26 and 34 of the locking projections 28 enable this tilting without the Sleeve 40 of the nocking point detaches from the base of the channel 24 and without the sleeve 40 jumping out of the locking projections 28 to the rear. With this tilting of the tendon, the collars 44 of the sleeve 40 lie in the recesses 36 and 38, so that the collars 44 do not exert any pressure on the cam which would cause a tilting moment acting on the arrow.

Wird die Sehne des Bogens zum Abschuss des Pfeiles freigegeben, so gelangt sie wieder in ihre in Fig. 4 gezeigte Ruhelage, wenn sich der Pfeil von der Sehne löst. Wie ein Vergleich der Figuren 4 und 5 zeigt, bleibt die Hülse 40 des Nockpunktes während des gesamten Vorganges der Beschleunigung des Pfeiles, in welchem sich die Sehne aus der in Fig. 5 gezeigten Stellung maximaler Auslenkung in die in Fig. 4 gezeigte Stellung im Moment des Abschusses bewegt, stets am Grund 26 der Rinne 24 anliegend und wird stets durch die Rastvorsprünge 28 an diesem Grund 26 anliegend gehalten. Es kann also während der gesamten Beschleunigung des Pfeiles keine undefinierte Lagebeziehung zwischen dem Nockpunkt der Sehne und dem Nock des Pfeils eintreten, die zu einer Treffungenauigkeit führen könnte. Wie Fig. 4 zeigt, ist in Moment des Abschusses, wenn sich der Nock von dem Nockpunkt der Sehne löst, eine ausreichend grosse Anlagefläche der Hülse 40 an dem Grund 26 der Rinne 24 in diametraler Richtung gegeben, um den Pfeil exakt senkrecht zur Sehne zu führen.If the bowstring of the bow is released to shoot the arrow, it returns to its rest position shown in FIG. 4 when the arrow is released from the bowstring. As a comparison of FIGS. 4 and 5 shows, the sleeve 40 of the nock point remains at the moment during the entire process of accelerating the arrow, in which the tendon extends from the position of maximum deflection shown in FIG. 5 to the position shown in FIG. 4 of the launch moves, always lying against the base 26 of the channel 24 and is always held against the base 26 by the locking projections 28. During the entire acceleration of the arrow, there can be no undefined positional relationship between the nock point of the tendon and the nock of the arrow, which could lead to an inaccuracy. As shown in FIG. 4, at the moment of firing, when the nock detaches from the nocking point of the tendon, there is a sufficiently large contact surface of the sleeve 40 on the base 26 of the groove 24 in a diametrical direction in order to close the arrow exactly perpendicular to the tendon to lead.

Claims (8)

1. A nock for arrows of bows for sport or hunting with a nock body (10), attachable to the end of the arrow shaft (12), with two nock wings (22) at the end of the nock body (10) which form a diametrically running groove (24) to accept the section of the bowstring which defines the nock location point, and with projections (28) built out on the inner side of the nock wings (22), running perpen- dicularto thearrow axis and narrowing the groove (24) at the end opposite its base (26), characterized in that the base (26) of the groove (24) at a peripheral cut away section (32) is sloped towards the arrow shaft (12) at an acute angle to the perpendicular axis of the arrow, in that the projections (28) at their opposite peripheral cut away section (34) are sloped towards the end of the nock at art acute angle to the perpendicular axis of the arrow, and in that the base (26) of the groove (24) at its peripherally sloped end and the projections (28) at their peripherally sloped ends. each have a circular notch (36 and 38) perpendicular to their direction of slope to receive the bands (44) defining the nock location point of the bowstring.
2. A nock according to Claim 1, characterized in that the base (26) of the groove (24) and the projections (28) are sloped at the same acute angle at the respective peripheral cut away sections (32 and 34).
3. A nockaccording to Claim 2, characterized in that the acute angle is about 30°.
4. A nockaccording to Claim 1, characterized in that the sloped cut away sections (32 and 34) of the base (26) of the groove (24) and of the projections (28) amount to about a half to a third of the diametrical length of the groove (24).
5. A nock according to Claim 1, characterized in that the separation of the circular notches (36 and 38) perpendicular to their planes corresponds to the diameter of the nock body (10) in the direction of the base (26) of the groove (24).
6. A nock according to Claim 1, characterized in that, in theregion from the base (26) of the groove (24) to the projections (28), the nock wings (22) are formed with elastically resilient walls with essentially constant minimum wall thickness in the diametric direction perpendicular to the groove (24).
7. A nock according to Claim 6, characterized in that the nock body (10) is tapered, to form essentially a truncated cone, from the end of the arrow shaft (12) up to the nock wings (22).
8. A nockaccording to Claim 7, characterized in that the nock body (10) has an essentially square cross-section, in the tapered truncated cone region and a diametric pair of its outer surfaces (20) are continued in the outer surfaces of the nock wings (22).
EP85111005A 1985-08-31 1985-08-31 Archery arrow nock Expired EP0213229B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT85111005T ATE32945T1 (en) 1985-08-31 1985-08-31 NOCK FOR ARROWS OF SPORTS AND HUNTING BOWS.
EP85111005A EP0213229B1 (en) 1985-08-31 1985-08-31 Archery arrow nock
DE8585111005T DE3561845D1 (en) 1985-08-31 1985-08-31 Archery arrow nock
US06/900,621 US4645211A (en) 1985-08-31 1986-08-26 Nock for arrows of sport and hunting bows
JP61201915A JPS6252399A (en) 1985-08-31 1986-08-29 Nock for bow and arrow for sport and hunting
KR1019860007235A KR930002783B1 (en) 1985-08-31 1986-08-30 Nock for arrows of sports and hunting bows

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85111005A EP0213229B1 (en) 1985-08-31 1985-08-31 Archery arrow nock

Publications (2)

Publication Number Publication Date
EP0213229A1 EP0213229A1 (en) 1987-03-11
EP0213229B1 true EP0213229B1 (en) 1988-03-09

Family

ID=8193727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85111005A Expired EP0213229B1 (en) 1985-08-31 1985-08-31 Archery arrow nock

Country Status (6)

Country Link
US (1) US4645211A (en)
EP (1) EP0213229B1 (en)
JP (1) JPS6252399A (en)
KR (1) KR930002783B1 (en)
AT (1) ATE32945T1 (en)
DE (1) DE3561845D1 (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4874180A (en) * 1987-09-29 1989-10-17 Afc, Inc. Arrow shaft end adaptor apparatus and balance pin apparatus and method
US5067731A (en) * 1990-05-25 1991-11-26 Bickel Wayne J Nock adapter
US5094464A (en) * 1991-02-08 1992-03-10 Musacchia Sr John Bowfishing arrow with releasable end assembly
US5186470A (en) * 1992-05-18 1993-02-16 Easton Aluminum, Inc. Offset arrow nock
US5439231A (en) * 1993-01-07 1995-08-08 Inventive Technology Archery arrow vane and nock assembly
US5290044A (en) * 1993-02-23 1994-03-01 Easton Aluminum, Inc. Stiffened arrow nock
US5465979A (en) * 1994-02-22 1995-11-14 Buhler; Clayton K. Arrows with reduced diameter nocks
US5921875A (en) * 1996-06-18 1999-07-13 Bickel; Wayne J. Reduced weight arrow point adapter having high density groove structure
US5823902A (en) * 1997-10-08 1998-10-20 Guest; Elmer F. Nock assembly for arrows
US7189170B1 (en) 2005-03-16 2007-03-13 Korsa Stephen P Arrow nock
KR101142236B1 (en) * 2009-12-30 2012-05-07 송문재 nock of arrow
US8496548B2 (en) * 2010-11-10 2013-07-30 Martin T. Connolly Wide-body arrow having tapered tail
US9829291B2 (en) 2010-11-10 2017-11-28 Aldila Golf Corporation Arrow having multiple exterior diameters and multiple interior diameters
US9297620B2 (en) 2010-11-10 2016-03-29 Aldila Golf Corp. Arrow having multiple exterior diameters and multiple interior diameters
WO2012075058A1 (en) 2010-11-29 2012-06-07 Aldila Golf Corporation Archery arrow having improved flight characteristics
US9644927B2 (en) 2010-11-29 2017-05-09 Aldila Golf Corp. Archery arrow having improved flight characteristics
US9028347B2 (en) 2012-04-06 2015-05-12 Out Rage, Llc Self centering nock
US9140527B2 (en) 2013-10-11 2015-09-22 Out Rage, Llc Vibration damping nock construction
US10254075B2 (en) 2013-12-16 2019-04-09 Ravin Crossbows, Llc Reduced length crossbow
US10254073B2 (en) 2013-12-16 2019-04-09 Ravin Crossbows, Llc Crossbow
US10712118B2 (en) 2013-12-16 2020-07-14 Ravin Crossbows, Llc Crossbow
US9285195B1 (en) * 2014-12-24 2016-03-15 Easton Technical Products, Inc. Compressible archery nock
USD839374S1 (en) 2017-02-15 2019-01-29 Ravin Crossbow, LLC Nock for an archery arrow
US10139205B2 (en) * 2017-02-15 2018-11-27 Ravin Crossbows, Llc High impact strength nock assembly
USD836743S1 (en) 2017-11-22 2018-12-25 Ravin Crossbows, Llc Nock for an archery arrow
US11606942B2 (en) * 2018-05-04 2023-03-21 Mcp Ip, Llc Bowfishing arrow
US10401117B1 (en) 2018-07-19 2019-09-03 Parker Compound Bows, Inc. Anti-dry fire keyway trigger system for crossbows
US11105592B1 (en) * 2018-11-05 2021-08-31 Barnett Outdoors, Llc Arrow with reduced diameter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2484589A (en) * 1945-02-10 1949-10-11 Kenneth D Richards Arrow nock
US3010446A (en) * 1958-01-21 1961-11-28 Our Lady Of The Genesee Abbey Arrow release for bows in archery
US3214174A (en) * 1962-05-16 1965-10-26 Charles A Saunders Archery arrow nock
GB1470802A (en) * 1975-03-10 1977-04-21 Adams J Arrow nock
US4305588A (en) * 1979-04-26 1981-12-15 Dodge Paul A Archery arrow nock

Also Published As

Publication number Publication date
ATE32945T1 (en) 1988-03-15
DE3561845D1 (en) 1988-04-14
JPH034840B2 (en) 1991-01-24
EP0213229A1 (en) 1987-03-11
JPS6252399A (en) 1987-03-07
KR930002783B1 (en) 1993-04-10
US4645211A (en) 1987-02-24
KR870002435A (en) 1987-03-31

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