EP2112453A2 - Amortiseur de vibrations pour arcs de tir - Google Patents

Amortiseur de vibrations pour arcs de tir Download PDF

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Publication number
EP2112453A2
EP2112453A2 EP09005540A EP09005540A EP2112453A2 EP 2112453 A2 EP2112453 A2 EP 2112453A2 EP 09005540 A EP09005540 A EP 09005540A EP 09005540 A EP09005540 A EP 09005540A EP 2112453 A2 EP2112453 A2 EP 2112453A2
Authority
EP
European Patent Office
Prior art keywords
vibration
handle
coupled
arrow
bow
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.)
Withdrawn
Application number
EP09005540A
Other languages
German (de)
English (en)
Inventor
Kyung Rae Park
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from KR1020090032104A external-priority patent/KR20090111769A/ko
Application filed by Individual filed Critical Individual
Publication of EP2112453A2 publication Critical patent/EP2112453A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/14—Details of bows; Accessories for arc shooting
    • F41B5/1403—Details of bows
    • F41B5/1426—Bow stabilisers or vibration dampers

Definitions

  • the present invention relates to a bow removing a torque occurring in an initial stage of an arrow shooting, and more particularly, to a damper capable of removing an initial torque occurring when an arrow leaves a bowstring and a bow having the damper installed thereto.
  • a bow includes a handle which a user grips by his/her hand, limbs coupled to upper and lower portions of the handle, and a string having ends fixed to the upper and lower limbs.
  • a handle which a user grips by his/her hand
  • limbs coupled to upper and lower portions of the handle
  • string having ends fixed to the upper and lower limbs.
  • the archery which is one of the sports, has been well-known as a sport game requiring very high concentration.
  • a stabilizer is coupled to the front of the handle at a position lower than the center of the bow.
  • the stabilizer (or balance bar) is generally coupled to a portion lower than a central portion of the handle to thereby maintain total balance of the bow and remove a bad motion occurring after the arrow shooting.
  • the stabilizer is coupled to a portion lower than a grip portion of the handle, so that the gravity center of the bow is formed lower than the grip portion of the handle, which makes the user relaxed after the arrow shooting.
  • the stabilizer serves to lessen still motions such as arrow shaking by wind, unnatural grip, slight muscular trembling and the like in a pre-shooting state where the user pulls the arrow back and balances the force, and also serves to rapidly remove stress applied to the overall bow after the arrow shooting.
  • the user feels the largest vibration (i.e., post vibration). It has been confirmed that the stabilizer efficiently absorbs a shock of the handle caused by the post vibration.
  • the stabilizer is coupled to a position lower than the central portion of the handle in order to give stability to the bow and protrudes to the front of the bow by a considerable length
  • the stabilizer has a limitation in that it absorbs vibration after the arrow is shot, i.e., after the arrow leaves a body (handle) of the bow.
  • an object of the present invention is to provide a bow capable of removing or mitigating a torque occurring until an arrow leaves a string and its feather leaves a grip portion of the bow after a user shoots the arrow.
  • another object of the present invention is to provide a vibration damping means suitable to remove or mitigate a torque occurring until an arrow leaves a string and its feather leaves a grip portion of the bow after a user shoots the arrow.
  • a bow according to the present invention comprises a handle gripped by a user's hand; upper and lower limbs respectively coupled to upper and lower portions of the handle; a string having ends coupled to the upper and lower limbs; and a vibration damping means coupled to the handle, wherein the vibration damping means is positioned at a central portion of the handle with the upper and lower limbs coupled thereto and positioned on a front surface of a grip portion of the handle.
  • the central portion of the handle is a ⁇ 7 cm distance range L from a distance center point M between the upper and lower limbs coupled to the handle in the up-down direction thereof.
  • the grip portion of the handle exists at the distance center point M between the upper and lower limbs.
  • the grip portion of the handle may not be positioned in the center of the handle.
  • the vibration damping means comprises a fixing portion coupled and fixed to a body of the handle; a vibration absorption portion mounted in the fixing portion to receive vibration occurring in the handle, transfer the vibration to the outside, and absorb and mitigate some of the vibration; a coupling portion including the vibration absorption portion therein and coupled to the fixing portion; and a weight coupled to the vibration absorption portion.
  • the vibration absorption portion may comprise a vibration transfer portion mounted in the fixing portion to receive vibration occurring in the handle and transfer the vibration to the outside; and an elastic portion for absorbing the vibration of the vibration transfer portion to mitigate the vibration.
  • the elastic portion preferably comprises a horizontal elastic absorption portion for absorbing and mitigating front-rear vibration of the vibration transfer portion, and a peripheral elastic absorption portion for absorbing up-down-left-right vibration of the vibration transfer portion.
  • FIG. 2 is a schematic view of a bow according to the present invention
  • FIGS. 3a and 3b are a side view and a perspective view showing the flow of vibration transferred at the time of shooting an arrow 101.
  • a bow 100 includes a handle 110 which a user grips by his/her hand.
  • the handle 110 is generally made of wood, magnesium, aluminum or carbon.
  • the handle 110 includes a grip portion 112 which the user grips by his/her hand in order to grip the bow 100.
  • a stabilizer 105 for maintaining stability of the bow may be coupled to the handle 110.
  • the bow 100 includes upper and lower limbs 122 and 124 respectively coupled to upper and lower portions of the handle 110.
  • the upper and lower limbs 122 and 124 are formed of a material with strong elasticity, and a string 130 is coupled therebetween.
  • the bow 100 includes a vibration damping means 140 coupled to the handle 110.
  • the vibration damping means 140 is positioned in a ⁇ 7 cm range from a distance center point M between the upper and lower limbs 122 and 124 coupled in the up-down direction of the handle 110, and positioned in front of the grip portion 112 of the handle 110.
  • the reason for coupling the vibration damping means 140 to the central portion of the handle 110 is as follows.
  • the first force is an adverse influence caused by impulsive forces applied to the upper and lower limbs 122 and 124 at the time of shooting the arrow 101.
  • the respective limbs 122 and 124 are given a considerable shock by the returning force.
  • the respective impulsive forces occurring in the upper and lower limbs 122 and 124 are transferred to respective body portions of the respective limbs 122 and 124 through ends thereof, then transferred to the upper and lower portions of the handle 110, and finally meet at the central portion of the handle 110.
  • the second force is an adverse influence caused by impulsive force applied to the string 130 at the time of shooting the arrow.
  • the string 130 instantly bounces to the front by the returning force, so that the arrow 101 is shot to the front by the bouncing force.
  • the arrow 101 i.e., the still obstacle, instantly disturbs a route of the string 130.
  • the string 130 is given left-right direction force, thereby causing a slight shaking motion in the left-right direction.
  • Such a shaking motion is transferred to the handle 110 through the upper and lower limbs 122 and 124 and finally concentrates at the central portion of the handle 110.
  • the third force is an adverse influence caused by impulsive force applied to the arrow 101 itself at the time of shooting the arrow 101.
  • the feather portion 102 at a rear portion of the arrow 101 is instantly given a shock and the impulsive force is gradually transferred to a front portion of the arrow 101, so that the arrow 101 flies to the front.
  • the arrow 101 passes through the handle 110, while being instantly slightly bent and straightened. During this process, it has a detrimental effect on the handle 110.
  • a portion through which the arrow 101 passes is a portion just above the grip portion 112, which corresponds to the central portion of the handle 110.
  • the handle 110 when the arrow 101 is shot, the handle 110 is under the adverse influences caused by at least three types of impulsive forces. Since these adverse influences are concentrated on the central portion of the handle 110, in order to rapidly remove or mitigate the adverse influences, the vibration damping means 140 is coupled to the central portion of the handle 110.
  • the vibration damping means 140 is coupled within the ⁇ 7 cm distance L range from the center point M between the upper and lower limbs 122 and 124 coupled to the handle 110 in the up-down direction thereof.
  • the most bows are designed so that the grip portion 112 of the handle 110 may exist in a position of the distance center point M between the upper and lower limbs 122 and 124 and the arrow 101 may rapidly pass over the grip portion 112 of the handle. Therefore, the vibration damping means 140 may be installed in a position of the grip portion 112.
  • the grip portion 112 of the handle 110 may not exist in an exact center of the handle 110.
  • a coupling position of the vibration damping means 140 may be different from a position of the grip portion 112. Accordingly, in the present invention, the coupling position of the vibration damping means 140 is set in an optimum point within the ⁇ 7 cm distance L range in the up-down direction not from the grip portion 112 but from the distance center point M between the upper and lower limbs 122 and 124.
  • the vibration damping means 140 is coupled to the front surface of the grip portion 112 of the handle 110.
  • the vibration damping means 140 When the vibration damping means 140 is positioned at the front surface portion of the handle 110, it is hidden from the user's view by the body of the handle 110. In a case where an archer aims an arrow at a target, since the vibration damping means 140 is hidden from his/her view, the archer can display more concentration.
  • the present invention provides the vibration damping means 140 suitable for removing the initial bad motion occurring in the handle of the bow at the time of shooting an arrow.
  • FIGS. 4a and 4b are a side view and an exploded view illustrating a preferred embodiment of the vibration damping means 140 according to the present invention, respectively, and FIG. 5 is an exemplary view illustrating another preferred embodiment of the vibration damping means 140 according to the present invention.
  • the vibration damping means 140 includes a fixing portion 142 coupled and fixed to the body of the handle 110. Since the fixing portion 142, which is a portion coupled to the body of the handle 110, is to transfer to another member a bad motion occurring in the handle 110 or transferred from the outside to the handle 110, a coupling configuration thereof is not specially limited. For example, a groove is formed in the body of the handle 110 and then the fixing portion 142 is inserted into the groove, or the fixing portion 142 adheres to the body of the handle 110 by an adhesive or is threadly engaged thereto.
  • the vibration damping means 140 includes a vibration absorption portion 144 mounted in the fixing portion 142.
  • the vibration absorption portion 144 serves to receive the vibration or bad motion transferred from the handle 110 through the fixing portion 142, transfer some of the vibration or bad motion to the outside, and absorb and mitigate some of the vibration or bad motion.
  • the vibration absorption portion 144 may be formed of a material capable of absorbing vibration by itself. More specifically, the vibration absorption portion 144 may be made of an elastic metal, and more preferably comprise a spring.
  • the vibration absorption portion 144 of the vibration damping means 140 is composed of a vibration transfer portion 143 mounted in the fixing portion 142 and an elastic portion 145 for absorbing vibration of the vibration transfer portion 143 to mitigate the vibration.
  • the vibration transfer portion 143 serves to receive the vibration or bad motion occurring in the handle 110 and transfer it to the outside.
  • the elastic portion 145 includes a horizontal elastic absorption portion 145a for absorbing and mitigating a front-rear vibration of the vibration transfer portion 143, and a peripheral elastic absorption portion 145b for absorbing an up-down-left-right vibration of the vibration transfer portion 143.
  • the horizontal elastic absorption portion 145a is preferably formed of an elastic body such as a spring, rubber, urethane, silicone, or the like, more preferably, in the shape of a spherical silicone ball.
  • the peripheral elastic absorption portion 145b is preferably formed of an elastic body such as a rubber, urethane, silicone, or the like, and in the shape of a donut surrounding the vibration transfer portion 143.
  • the vibration damping means 140 includes a coupling portion 146 having the vibration absorption portion 144 provided therein.
  • the coupling portion 146 mounts the vibration absorption portion 144 therein, protects the vibration absorption portion 144 from the outside, and prevents the vibration absorption portion 144 from escaping to the outside. To this end, it is preferable to couple the coupling portion 146 to the fixing portion 142.
  • a coupling method thereof is not specially limited, a threadly engaging manner is preferably used to firmly couple them.
  • the vibration damping means 140 includes a weight 148 coupled to the vibration absorption portion 144.
  • the weight 148 is used to remove a bad motion best, with its weight changed according to a kind of a bow, a physique of an archer, or a shooting style of an archer.
  • the weight 148 is coupled to the vibration absorption portion 144 and receives vibration therefrom, so that it may move mainly in the front-rear direction and move in the up-down-left-right direction according to a kind of the vibration.
  • the weight 148 moves relative to the handle 110 due to the law of action and reaction, the law of inertia and the like, and offsets some of the vibration and the torque (bad motion) during this process. That is, while the weight 148 performs the relative motion, the horizontal elastic absorption portion 145a absorbs the front-rear direction vibration or bad motion, and the peripheral elastic absorption portion 145b absorbs the up-down-left-right direction vibration or bad motion.
  • vibration damping means is coupled to a central portion of a handle, it is possible to efficiently remove or mitigate a bad motion occurring in the handle from the time when an arrow is shot from a string to the time when the arrow passes through the body of the handle.
  • the front-rear direction vibration occurring in the handle and the left-right direction vibration occurring in the handle were measured as follows.
  • FIG. 6a is a photograph of the experiment system
  • FIG. 6b is a partial enlarged photograph of the grip portion with the vibration measurement sensor installed thereon.
  • the vibration measurement sensor was a product of Kistler Instrument Corp. (U.S.)
  • a program that analyzed vibration signals from the vibration measurement sensor into a graph was a product of Signal Link Co. (Republic of Korea).
  • FIG. 6c is a photograph of analysis graphs of the vibrations measured in various types of bows using the program of Signal Link Co.
  • Slight vibration of the handle measured by the system of Example 1 was calculated as the amount of acceleration change by means of the program of Signal Link Co. and obtained as a specific graph, which is shown in FIG. 7a .
  • an axis of abscissa indicates a time (unit: second) having passed after the arrow shooting
  • an axis of ordinate indicates the acceleration of the handle. Referring to FIG. 7a , slight vibration was intensely applied to the handle after about 0.05 second from the arrow shooting, then gradually reduced, and considerably reduced after about 0.2 second.
  • Slight vibration of the handle measured by the system of Comparative Example 1 was calculated as the amount of acceleration change by means of the program of Signal Link Co. and obtained as a specific graph, which is shown in FIG. 7b .
  • slight vibration was intensely applied to the handle after about 0.05 second from the arrow shooting, then gradually reduced, and considerably reduced after about 0.3 second.
  • Example 1 when Example 1 and Comparative Example 1 were compared with each other, it can be seen that in Example 1, the amplitude of the acceleration was very small and the amount of acceleration change was remarkably reduced in a shorter time.
  • FIG. 9a shows, on the upper side, a photograph obtained by photographing this experiment system from the front and on the lower side, a graph obtained by analyzing the data photographed by this experiment system by the TEMA program.
  • Example 2 when Example 2 and Comparative Example 2 were compared with each other, it can be seen that in Example 2, the amplitude and density in the left-right direction were considerably reduced and stabilized within a short time.
  • the bow according to the present invention can efficiently mitigate a torque occurring in its handle from the time when a user shoots an arrow to the time when the arrow passes through a grip portion.
  • the bow according to the present invention considerably mitigates the torque occurring until the arrow passes through the grip portion after it is shot, the bow allows the arrow shot by the user to more precisely fly toward a target which is a first aimed destination.
  • a damper according to the present invention can absorb front-rear direction stress and up-down-left-right direction stress occurring in an initial stage, it can efficiently remove or mitigate an initial torque.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Vibration Prevention Devices (AREA)
  • Steering Devices For Bicycles And Motorcycles (AREA)
EP09005540A 2008-04-22 2009-04-20 Amortiseur de vibrations pour arcs de tir Withdrawn EP2112453A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20080037215 2008-04-22
KR1020090032104A KR20090111769A (ko) 2008-04-22 2009-04-14 초기의 불량운동을 완화시킨 양궁

Publications (1)

Publication Number Publication Date
EP2112453A2 true EP2112453A2 (fr) 2009-10-28

Family

ID=40941474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09005540A Withdrawn EP2112453A2 (fr) 2008-04-22 2009-04-20 Amortiseur de vibrations pour arcs de tir

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US (1) US20090260609A1 (fr)
EP (1) EP2112453A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1967812B1 (fr) * 2007-03-07 2014-08-06 Prince Sports, Inc. Arc de tir ayant une structure à plusieurs tubes
US9016268B2 (en) * 2009-11-18 2015-04-28 Leven Industries Adjustable mechanical vibration limiting and absorbing apparatus
US11022399B2 (en) * 2019-06-12 2021-06-01 Kirk L. Wendelburg Inertial dampener riser for an archery bow

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5611325A (en) * 1996-03-27 1997-03-18 Kudlacek; Donald S. Archery bow stabilizer
US6718964B1 (en) * 2001-09-04 2004-04-13 Carolina Archery Products Archery bow stabilizer

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