WO2008117964A1

WO2008117964A1 - Twins stick

Info

Publication number: WO2008117964A1
Application number: PCT/KR2008/001640
Authority: WO
Inventors: Sang-Min Lee
Original assignee: Sang-Min Lee
Priority date: 2007-03-28
Filing date: 2008-03-24
Publication date: 2008-10-02

Abstract

The present invention relates to a nunchaku(twins stick), and more particularly to a nunchaku which even a beginner can use easily because it can absorb impact although his body is unintentionally struck thereby, and he can selectively use as sticks for beginners or for experts because it can be partially separated if required. To this end, the nunchaku of the invention is characterized by comprising: a pair of sticks having a first elastic part of elastic material on the outer side thereof to enable a user to hold the part; a pair of head units removably coupled to each end of the one pair of the sticks and having a second elastic part of elastic material on the outer side thereof; and a connection cord for connecting the one pair of head units together, wherein one of the one pair of sticks and the one pair of head units is provided with at least one projection for coupling, and the other thereof is provided with at least one coupling slot to which the at least one projection is coupled.

Description

TWINS STICK

Technical Field

[1] The present invention relates to a nunchaku(twins stick), and more particularly to a nunchaku which even a beginner can use easily because it absorbs impact although his body is struck by the nunchaku, and which he can selectively use as sticks for beginners or for experts because it can be partially separated if required. Background Art

[2] A nunchaku(twins stick) is generally called a daesoja, sosoja, sobanryonggon and the like, among which a nunchaku is usually used. A general nunchaku consists of two short sticks connected by means of a soft and strong cord.

[3] Long time ago, a nunchaku was effectively used as a weapon to attack enemies and military horses of enemies at war, but it has been used as a weapon for self-defense or for physical exercise lately. A nunchaku is used to do 4 types of action, e.g., striking, thrusting, blocking and twisting, but is used to achieve a wide variety of applicable actions. It is, however, considered that the power of a nunchaku is great when a user is at a level to use it at his will. It is an advantage that he can learn how to use it without being taught.

[4] It is known that basic techniques of a nunchaku include front striking, down-up striking, down-up turn striking, leg striking, whirling, left-right up striking, one- shoulder turning, left-right back up-striking, neck reaction striking, neck turning, horizontal cross-holding, horizontal turn-holding, back turn-holding, spinning, 8-shape turning, etc.

[5] Accordingly, for people who do not have much time for physical exercise, the nunchaku is easy to carry, and is a good tool for physical exercise by themselves, which does not need a wide space and additional cost to do exercise with it.

[6] However, in spite of such an advantage, since most of known nunchakus have a rough and hard surface, a beginner may disadvantageously be given a significantly large impact when he does a wrong action and is thus struck by his nunchaku. In addition, since most of known nunchakus have an integrated structure impossible to be partially separated, it is not easy to carry or use them in some cases.

[7] Furthermore, although a conventional nunchaku has the aforementioned advantage, it is sometimes not easy for both of adults and children who have a different hand size to use the same typical nunchakus together.

[8] It is known that a user can perform stable and highly advanced techniques in doing all sorts of rotation techniques as an ideal nunchaku user in a case that the connection cord of a nunchaku is placed on the back of user's hand and the connection cord length is equal to the length of the back of user's hand.

[9] To this end, nunchakus are currently produced to be large, medium and small in its size. However, it is not considered that each person has a different hand size. Although the size is differentiated as large, medium and small, it is disadvantageous that users have to adjust the connection cord matching to their hand size each time.

[10] A method to address such a problem is disclosed in the published KP No.

20-1999-6956. The solution disclosed in the document is a pipe-type chain aluminum nunchaku. However, with the nunchaku disclosed in the document, a special tool is required to remove a connecting pin in order to adjust the length of a chain which is the connection and another disadvantage is that a user may be injured when removing the connecting pin. This is because, for the disclosed nunchaku, the connection is in a chain form and the connecting pin is used as a means to prevent the chain from being released.

[11] Considering that nunchakus are currently used by martial art practicians as well as small children in martial art drill halls, there is a need that a user can easily adjust the connection cord of a nunchaku matching to his hand size in a way to be safe from injury. Disclosure of Invention

Technical Problem

[12] It is an object of the present invention to provide a nunchaku(twins stick) which even a beginner can use easily and safely in a way that impact can be absorbed when he is accidentally struck by the nunchaku, and, in particular, he can selectively use it as sticks for beginners and experts if required because it can be partially separated.

[13] It is another object of the invention to provide a nunchaku in which a user can easily adjust the length of a connection cord thereof matching to his hand size in a safe way from injury. Technical Solution

[14] The aforementioned object of the invention is achieved by a nunchaku(twins stick) comprising a pair of sticks having a first elastic part of elastic material on the outer side thereof for a user to hold the part; a pair of head units removably coupled to each end of the one pair of the sticks and having a second elastic part of elastic material on the outer side thereof; a connection cord for connecting the one pair of head units together, wherein one of the one pair of sticks and the one pair of head units is provided with at least one projection for coupling, and the other thereof is provided with at least one coupling slot to which the at least one projection is coupled.

[15] Here, the one pair of the sticks is provided with a first support provided in the first elastic part, and the one pair of head units is provided with a second support provided in the second elastic part and protruding toward one side of the second elastic part.

[16] The number of the at least one projection is preferably 4. The four projections are equidistantly arranged on the outer protruding side of the second support protruding from the second elastic part. The coupling slots are formed in the first support at each point corresponding to the four projections, respectively.

[17] Each of the coupling slots comprises a first part formed in a longitudinal direction along the length direction of the sticks and a second part formed in a direction crossing the first part at the end of the first part and for blocking unintentional release of the projections passing through the first part.

[18] The end of the second part is formed with a projection slot for finally fixing the projection.

[19] The first and second supports are preferably tubular in order to reduce the weight thereof.

[20] The end of the one pair of the sticks may be further provided with a decoration member.

[21] For sticks for exercise, the second support comprises an upper plastic support relatively rigid and provided with the upper coupling slot and a lower plastic support arranged on the lower part of the upper support and softer than the upper support, the surface of the lower support being formed with a plurality of through-holes.

[22] One of the one pair of the sticks and the one pair of the head units is formed with a plurality of binding projections projecting towards the other pair, which is formed with binding slots to be coupled to the plurality of binding projections.

[23] The plurality of binding projections are formed on the one pair of head units, and the plurality of binding slots are formed on the one pair of rods. The side where the plurality of binding slots are formed is arranged on a position lower than the upper side of the first support.

[24] Furthermore, the object of the invention is achieved by a nunchaku characterized by comprising a pair of sticks to enable a user to hold the nunchaku; a pair of head units removably coupled to each end of the one pair of rods; a connection cord for connecting the one pair of head units together; and a cord length adjustment means coupled to at least one of the one pair of sticks and the one pair of head units and for adjusting the length of the connection cord.

[25] Here, the cord length adjustment means comprises: a flare-type cord chucking unit provided in at least one of the one pair of head units, and formed with a chucking means for chucking the connection cord on the inner side thereof; and a unit pressing means coupled to one end of the connection cord, removably coupled to the cord chucking unit and for pressing the cord chucking unit so that the chucking means of the cord chucking unit can chuck the connection cord when coupled to the cord chucking unit.

[26] The outer side of the cord chucking unit is formed with a first curved part of which the cross section gradually is smaller as it goes downward. The inner side of the unit pressing means is formed with a second curved part for pressing the first curved part towards the inside in the radius direction. The end of the second curved part is formed with a stop, and the cord chucking unit is formed with a release blocking unit for blocking the stop on the unit pressing means from being unintentionally released.

[27] One end of the one pair of sticks is formed with an insertion counterpart in which an insertion stick of the protruding end in the unit pressing means is inserted.

[28] One of the one pair of sticks and the one pair of the head units is provided with a female screw and the other thereof is provided with a male screw for releasing and coupling the sticks from/to the head units.

[29] Each end of the one pair of head units is provided with a conical cord rotation unit for easy rotation of the connection cord.

Advantageous Effects

[30] The nunchaku(twins stick) of the present invention has an effect that even a beginner can use it easily because it can absorb impact although his body is struck by it unintentionally, and he can selectively use it as sticks for beginners or for experts because it can be partially separated if required.

[31] According to this embodiment, it is possible to adjust the length of the connection cord of the nunchaku matching to user's hand size in an even easier manner while being safe from the danger of injury. Brief Description of the Drawings

[32] These and other features, aspects, and advantages of the present invention will become apparent through the following description, illustrated in the appended drawings, in which like components are denoted by like reference numerals. The various features of the drawings may not be to scale. In the drawings:

[33] Fig. 1 is a perspective view of a nunchaku(twins stick) in which sticks for beginners are employed according to a first embodiment of the invention;

[34] Fig. 2 is a partially exploded perspective view of the nunchaku shown in Fig.1 ;

[35] Fig. 3 is a bottom view of a head unit for a connection cord shown in Fig.1 ;

[36] Fig.4 is a schematically perspective view of the nunchaku shown in Fig.1 ;

[37] Fig.5 is a perspective view showing the inside of a stick for experts;

[38] Fig.6 is a perspective view of a nunchaku according to a second embodiment of the invention;

[39] Fig.7 is a partially exploded perspective view of a nunchaku according to a third embodiment of the invention;

[40] Fig.8 is a perspective view of a nunchaku according to a fourth embodiment of the invention;

[41] Fig.9 is a partially exploded perspective view of the nunchaku shown in Fig.8; and

[42] Figs.10 and 11 schematically show a process for adjusting the connection cord, respectively. Best Mode for Carrying Out the Invention

[43] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[44] In the drawings, like components are denoted by like reference numerals in the description of the preferred embodiments of the invention.

[45] Fig. 1 is a perspective view of a nunchaku(twins stick) in which sticks for beginners are employed according to a first embodiment of the invention; Fig. 2 is a partially exploded view of the nunchaku shown in Fig.1 ; Fig. 3 is a bottom view of a head unit for a connection cord shown in Fig.1 ; Fig.4 is a schematically perspective view of the nunchaku shown in Fig.1 ; and Fig.5 is a perspective view of the inside of a stick for exercise.

[46] The nunchaku according to the first embodiment of the invention comprises a pair of sticks 110a and 110b, a pair of head units 150 removably coupled to each end of the one pair of sticks 110a and 110b, and a connection cord for connecting the one pair of head units together.

[47] The one pair of sticks 110a andl 10b may be a stick 110a for beginners shown in

Figs.1,2 and 4, or a stick 110b for experts shown in Fig.5.

[48] Therefore, beginners or children who use the nunchaku for the first time insert the one pair of head units 150 in the one pair of sticks 110a for beginners shown in Figs.1.2 and 4, the connection cord 130 being coupled to each of the one pair of head units 150, in order to use the nunchaku. Since the nunchaku can keep both of flexibility and elasticity, the amount of impact the user feels is reduced to be rather safer from danger of injury.

[49] When the user gets some skill of using the nunchaku, he can combine the one pair of head units 150 coupled to the connection cord 130 with the stick 110b for experts shown in Fig.5.

[50] With reference to Figs.1, 2, and 4, the stick for beginners 110a will be first described. The stick for beginners 110a comprises a first tubular support 111 and a first elastic part 112 of elastic material provided on the outer side of the first support 111. A user wrap-holds the first elastic part 112 of elastic material.

[51] The first support 111 is a frame in the stick for beginners 110a. Therefore it can be tubular and made of plastic material. It is an advantage that the first support 111 is hollow-tube shaped and the weight of the stick for beginners 110a is thus reduced.

[52] For the sticks for beginners 110a, the first support 111 consists of an upper support

I l ia and a lower support 11 Ib, respectively, arranged on the upper and lower parts along the longitudinal direction of the stick for beginners 110a.

[53] The upper support 11 Ia is formed with coupling slots 162 as will be described in the following, and the upper support 11 Ia is made of relatively rigid plastic material. Therefore, wobbling is avoided when the one pair of head units 150 is coupled to the upper support I l ia.

[54] As compared to the upper support I l ia, the lower support 11 Ib is made of plastic material softer than that of the upper support I l ia. The surface of the lower support 11 Ib is formed with a plurality of through-holes 11 Ic. The plurality of through-holes 111c are a means for reducing the weight of the stick for beginners 110a. Therefore, it is not necessary that the shape of the through-holes should be circular. In this case, the upper support I l ia may adjoin or be spaced slightly from the lower support 11 Ib in the first elastic part 112.

[55] The first elastic part 112 is produced to integratedly wrap the outer side of the upper support I l ia and the lower support 11 Ib. It is preferred that the first elastic part 112 in the stick for beginners 110a is made of more elastic material than that for the first elastic part 122 in the stick for experts 110b.

[56] Describing the stick for experts 110b with reference to Fig.5, the stick for experts

110b consists of a first support 121 of plastic material formed therein and a first elastic part 122 wrapping the outer side of the first support 121.

[57] The first support 121 of the stick for experts 110b may be made of the same material as that of the upper support 11 Ia in the stick for beginners 110a as described in the above. It is not necessary that the first support 121 of the stick for experts 110b is separated as in the first support 111 of the stick for beginners 110a. However, since the scope of the invention is not limited thereby, the stick for experts 110b may be produced in the same manner as that for a stick for beginners 110a.

[58] The first elastic part 122 of the stick for experts 110b may be produced of more rigid and stronger material as compared to that for the first elastic part 112 of the stick for beginners HOa.

[59] The one pair of head units 150 is removably coupled to one end of the stick for beginners 110a, respectively, as shown in Figs.l, 2 and 4, or removably coupled to each one of the sticks for experts 110b as shown in Fig.5.

[60] The one pair of head units 150 is connected each other by means of the connection cord 130. In this case, the connection cord 130 may be of any material, e.g., a cord, rope, etc. as required. However, since the scope of the invention is not limited thereby, the connection cord 130 may be an iron chain. If the connection 130 is a cord or rope, the ends of the connection 130 are knotted with the second support 152 of the one pair of head units 150, respectively, and it may be also loop-shaped for connecting the one pair of head units 150 in an integral manner.

[61] The one pair of head units 150 consists of a second elastic part 151 for forming the outer side thereof, and a second support 152 provided inside the second elastic part 151 to form a frame of the one pair of head units 150 and made of tubular plastic material. In this case, the second support 152 protrudes by a given length from one end of the second elastic part 151.

[62] Furthermore, four projections 161 and four coupling slots 162 are formed in order to removably couple the sticks for beginners 110a and the sticks for experts 110b to the one pair of head units 150 coupled by means of the connection cord 130. As in this embodiment, when each of the four projections 161 is inserted in each of the four coupling slots 162 as described in the following, stronger coupling force is obtained.

[63] Of course, since the scope of the invention is not limited thereby, the number of the projections 161 and the coupling slots 162 may be properly varied. For example, there may be provided two or three projections 161 and accordingly two or three coupling slots 162 to be coupled thereto.

[64] Mainly referring to Figs. 2 and 3, four projections 161 are formed in the one pair of head units 150. In particular, the four projections 161 are formed on the outer side of the second support 152 partially protruding from the second elastic part 151 in the one pair of head units 150. In this case, the four projections 161 are equidistantly arranged on the outer side of the second support 152.

[65] The four coupling slots 162 are equidistantly arranged along the circumferential direction on the inner side of the first support 111 and 121 corresponding to the four projections 161 in the sticks for beginners 110a and the sticks for experts 110b. In this case, the four coupling slots 162 may be shaped substantially a groove. However, if they are simply groove-shaped, the one pair of head units 150 may be unintentionally released when a user swings his nunchaku.

[66] To avoid such an unintentional release, the four coupling slots 162 consist of a first straight part 162a formed along the longitudinal direction of the sticks for beginners 110a and the sticks for experts 110b and a second part 162b formed at the end of the first part 162a in a direction intersecting the first straight part 162a for blocking an unintentional release of the projections 161 passing through the first part 162a.

[67] In this case, the end of the second part 162b may be further formed with projection slots 162c for finally fixing the position of the projections 161. However, since the scope of the invention is not limited thereby, the projection slots 162c may not be formed. [68] With such an inventive configuration, coupling the one pair of head units 150 coupled by means of the connection cord 130 to the sticks for beginners 110a and the sticks for experts 110b results in pushing the four projections 161 formed in the one pair of head units 150 into the first part 162a of the four coupling slots 162 formed in the sticks for beginners 110a and the sticks for experts 110b.

[69] Thereafter, when each of the four projections 161 reaches the end of the first part

162a, the one pair of head units 150 is turned in one direction.

[70] Each of the four projections 161 then moves along the second part 162b at the end of the first part 162a, respectively, and rests in the projection slots 162c finally to be fixed in its position. Accordingly, although a user excessively swings his nunchaku in this state, it is avoided that the one pair of head units 150 is taken out of the sticks for beginners 110a and the sticks for experts 110b.

[71] According to this embodiment of the invention with such a configuration, since the one pair of head units 150 can be coupled to the sticks for beginners 110a or the sticks 110b for experts connected by means of the connection cord 130 to use the nunchaku, both of beginners or skilled people can use the same nunchaku easily.

[72] In particular, since the nunchaku according this embodiment of the invention is provided with elastic parts 112,122 and 151 on all of outer sides thereof to absorb impact although his body is struck by the nunchaku unintentionally, even a beginner can use it safely.

[73] Fig.6 is a perspective view of a nunchaku according to a second embodiment of the invention.

[74] Referring to Fig.6, an additional decoration member 170 may be further provided at the end of the sticks for beginners 110a and the sticks for experts 110b.

[75] The decoration member 170 may be a bell shown in the figure or ribbons not shown in the figure. Such a decoration member 170 is advantageous in the case of gymnastics or model skill demonstration. The decoration member 170 may be provided by making holes or providing clips, which process is not shown in the drawings.

[76] Fig.7 is a partially exploded perspective view of a nunchaku according to a third embodiment of the invention.

[77] Referring to Fig.7, the one pair of head units 150 is formed with a plurality of coupling projections 155, and the sticks for beginners 110a and the stick for experts 110b are formed with a plurality of coupling holes 115 to which the plurality of coupling projections 155 are coupled.

[78] To this end, as described above, coupling the one pair of head units 150 to either the sticks for beginners 110a or the sticks for experts 110b results in multiplied coupling force by means of the coupling projections 155 and the coupling holes 115. [79] Of course, since the scope of the invention is not limited thereby, the positions of the coupling projections 155 and the coupling holes 115 may be interchanged. That is, the coupling projections 155 may be formed on the sticks for beginners 110a and the sticks for experts 110b, and the coupling holes 115 may be formed in the one pair of head units 150.

[80] In addition, the coupling projections 155 in this embodiment are provided along the circumferential direction on the lower side of the second elastic part 151 while the coupling holes 115 are provided on the upper side of the first elastic part 112 lower than the upper side of the first support 111. However, it should be noted that the invention is not limited thereby.

[81] Fig.8 is a perspective view of a nunchaku according to a fourth embodiment of the invention. Fig.9 is a partially exploded perspective view of the nunchaku in Fig.8. Figs.10 and 11 schematically show a process of adjusting the connection cord, respectively.

[82] As shown in the figures, the nunchakus according to the embodiment comprises a pair of sticks 210, a pair of head units 220, a connection cord 230 and a connection cord length adjustment means 240.

[83] For the configurations of one pair of sticks 210 and one pair of head units 220, two sticks and two head units are in particular provided for clarity of description, but the same reference numerals are given for them. Each of the configuration will be described in more detail.

[84] The one pair of sticks 210 is a part to enable a user to hold his nunchaku when he uses it with his hands for martial art or skill practice. As described in the above, the sticks may be produced to be a circular stick with a given cross section.

[85] Since the one pair of sticks 210 is removably coupled to the one pair of head units

220, the one pair of sticks 210 may be sticks for beginners or for experts, as described in the above embodiments.

[86] Since the sticks for beginners may be used by a user who uses the nunchaku for the first time, the outer surface of the sticks for beginners is preferably of elastic material. However, since the scope of the invention is not limited thereby, the outer surface of the sticks for experts may also be of elastic material. Detailed description thereof will not be provided, and it is recommended to see the aforementioned embodiments if required.

[87] The one pair of head units 220 is a part for supporting the connection cord 230 and removably coupled to the one pair of sticks 210 as described above.

[88] In order to couple the one pair of sticks 210 removably to the one pair of head units

220, the outer surface of the one pair of sticks 210 is formed with a male screw 210a and the inner surface of the one pair of head units 220 is formed with a female screw to be screw-coupled to the male screw 210a. Alternatively, however, the one pair of sticks 210 may be formed with a female screw and the one pair of head units 220 may be formed with a male screw.

[89] The end of the one pair of head units 220 is formed with a conical cord rotation means 225 for easy rotation of the connection cord 230. The conical cord rotation means 225 facilitates rotation of the connection cord 230. If there is not formed the conical cord rotation means 225, the connection cord 230 may be caught by the corner on a corresponding position in rotation and the connection cord 230 may be easily abraded. For that reason, the conical cord rotation means 225 is further formed in this embodiment.

[90] The connection cord 230 is used to connect the one pair of head units 220 together.

Conventionally, the connection cord 230 is made of a chain, but it is made of general cloth or a rope in this embodiment. However, since the scope of the invention is not limited thereby, the connection cord 230 in this embodiment may be of a chain.

[91] Both ends of such a connection cord 230 are fixed to the one pair of head units 220, respectively. The type of fixing may be a knot or a ring to be connected to the connection cord 230.

[92] In addition, most of such connection cords 230 have a predetermined length which cannot be adjusted, but the length of the connection cord 230 in this embodiment is enabled to be adjusted by a user.

[93] That is, by even more easily adjusting the length of the connection cord 230 of a nunchaku matching to user's hand size, he can more efficiently practice martial art or exercise with his nunchaku.

[94] In order to adjust the length of the connection cord 230, the nunchaku of this embodiment is provided with a cord length adjustment means 240 as shown in Figs.10 and 11. In this case, the cord length adjustment means 240 may be equipped in the one pair of head units 220, respectively, but although either of the one pair of head units 220 may have the cord length adjustment means 240, the nunchaku can normally operate.

[95] Such a cord length adjustment means 240 consists of a cord chucking unit 250 and a unit pressing means 260.

[96] The cord chucking unit 250 is provided in either of the one pair of the head units

220. The unit 250 may be integrated with or separated from the head unit 220. As shown in the figures, the cord chucking unit 250 may be shaped a flare-type tube.

[97] The inner side of the cord chucking unit 250 is formed with a chucking means 251 for chucking the connection cord 230. The shape of the chucking means 251 is not limited to a specific type, but the means 251 is shaped a screw thread having a pointed front head in this embodiment. As such, when the flare-type cord chucking unit 250 is getting narrowed as shown in Fig.11 while being widened as shown in Fig.10, the connection cord 230 can be fixed at its position as the chucking means 251 chucks the connection cord 230.

[98] The outer surface of the flare-type cord chucking unit 250 is formed with a first curved part 252 where its cross section is gradually smaller towards the lower part thereof. The first curved part 252 acts to narrow the inner diameter of the flare-type cord chucking unit 250 by means of interaction with the second curved part 262 of the unit pressing means 260 to be described in the following.

[99] The unit pressing means 260 acts to press the cord chucking unit 250 when it is coupled to the cord chucking unit 250, in order for the chucking means 251 of the cord chucking unit 250 to chuck the connection cord 230. So to speak, the unit pressing means 260 acts to press the cord chucking unit 250 so that the inner diameter of the cord chucking unit 250 becomes narrowed.

[100] The inner surface of the unit pressing means 260 is formed with a second curved part 262 for pressing the first curved part 252 formed on the cord chucking unit 250 towards the inner side in the radius direction. The second curved part 262 is produced to have a given radius of curvature as for the first curved part 252. The second curved part 262 is produced to have a larger radius of curvature than that of the first curved part 252 so that, when the unit pressing means 260 is coupled to the cord chucking unit 250, the second curved part 262 can press the first curved part 252 towards the inner side in the radius direction. However, it should be noted that the scope of the invention is not limited thereby.

[101] In addition, it should be avoided that the unit pressing means 260 is unintentionally released from the cord chucking unit 250 after the unit pressing means 260 is coupled to the cord chucking unit 250.

[102] To avoid such a condition of unintentional release, the end of the second curved part 262 of the unit pressing means 260 is formed with a stop 263, and the cord chucking unit 250 is formed with a release blocking means 253 for blocking the stop 263 of the unit pressing means 260 from being unintentionally released. In initial assembly, the stop 263 is forced to be narrowed to position it beyond the release blocking means 253, and the stop 263 is substantially thereafter not released from the release blocking means 253.

[103] The end of the unit pressing means 260 toward the one pair of the sticks 210 is formed with a protruding insertion part 261. Such a protruding end insertion part 261 is inserted in an insert counterpart 211 which is formed at one end of the one pair of sticks 210. As the one pair of the sticks 210 is coupled to the one pair of head units 220 after the protruding end insertion part 261 is inserted in the insert correspondent 211, the unit pressing means 260 is also assembled at a relevant position not to be released. [104] The process for adjusting the length of the connection cord 230 in a nunchaku with the aforementioned configuration will be described hereinafter with reference to Figs.lO and l l.

[105] In order to shorten or lengthen the length of the connection cord 230, the length of the connection cord 230 is adjusted while the unit pressing means 260 is separated from the cord chucking unit 250, and the unit pressing means 260 is then coupled to the cord chucking unit 250.

[106] The unit pressing means 260 is then pushed up to the upper part of the cord chucking unit 250. While the second curved part 262 which contacts the first curved part 252 then moves upward, it presses the first curved part 252, thereby causing the overall inner diameter of the cord chucking unit 250 to be narrowed.

[107] As such, when the inner diameter of the cord chucking unit 250 is narrowed, the chucking means 251 thereby chucks the connection cord 230 to adjust the length of the connection cord 230 thus to be fixed at its position (see Fig.l 1).

[108] After completing the process of fixing the connection cord 230, the assembly procedure is simply completed by coupling the one pair of sticks 210 to the one pair of head units 220 in a screw coupling manner.

[109] Of course, in the method of general assembly, in order to adjust the length of the connection cord 230 while the assembly process is completed as shown in Fig.11, it is possible in an even easier way to adjust the length of the connection cord 230 by adjusting the length of the connection cord 230 at the point after properly separating the one pair of sticks 210 from the one pair of head units 220 without completely separating them, and then by mutually tightening the one pair of sticks 210 and the one pair of head units 220.

[110] As such, according to this embodiment, it is possible to adjust the length of the connection cord 230 of the nunchaku matching to user's hand size while being safe from the danger of injury.

[I l l] In particular, considering the nunchaku of this embodiment is used by adults for martial art practice and also by children for general martial art drill, it is avoided that every children buys his own nunchaku matching to his hand size, and the nunchaku according to the invention is thus advantageous that it is not necessary to have many nunchakus for all the children in a nunchaku training club because every children can adjust the length of the connection cord 230 matching to his hand size.

[112] As described above, it will be apparent to those skilled in the art that the scope of the invention is not limited by the embodiment described above, and a variety of modifications and variations can be made therein without departing from the scope and the spirit of the invention. It should be noted that such modifications and variations of the invention are covered by the accompanying claims of the invention. [113] The present invention has been described in detail. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only.

[114] Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those stated in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

[115] The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims

[1] A nunchaku comprising: a pair of sticks having a first elastic part of elastic material on the outer side thereof to enable a user to hold the part; a pair of head units removably coupled to each end of the one pair of the sticks and having a second elastic part of elastic material on the outer side thereof; and a connection cord for connecting the one pair of head units together, wherein one of the one pair of sticks and the one pair of head units is provided with at least one projection for coupling, and the other thereof is provided with at least one coupling slot to which the at least one projection is coupled.

[2] The nunchaku as claimed in claim 1, characterized in that the one pair of the sticks is provided with a first support provided in the first elastic part, and the one pair of head units is provided with a second support provided in the second elastic part and protruding toward one side of the second elastic part.

[3] The nunchaku as claimed in claim 2, characterized in that: the number of the at least one projection is 4; the four projections are equidistantly arranged on the outer protruding side of the second support protruding from the second elastic part; and the coupling slots are formed in the first support at each point corresponding to the four projections, respectively.

[4] The nunchaku as claimed in claim 3, characterized in that each of the coupling slots comprises a first part formed in a longitudinal direction along the length direction of the sticks and a second part formed in a direction crossing the first part at the end of the first part and for blocking unintentional release of the projections passing through the first part.

[5] The nunchaku as claimed in claim 4, characterized in that the end of the second part is formed with projection slots for finally fixing the projections, respectively.

[6] The nunchaku as claimed in claim 2, characterized in that the first and second supports are shaped a tube in order to reduce the weight thereof.

[7] The nunchaku as claimed in claim 1, characterized in that the end of the one pair of the sticks is further provided with a decoration member.

[8] The nunchaku as claimed in claim 2, characterized in that, in a stick for beginners, the second support comprises an upper plastic support relatively rigid and formed with the upper coupling slot and a lower plastic support arranged on the lower part of the upper support and softer than the upper support, and in that the surface of the lower support is formed with a plurality of through-holes.

[9] The nunchaku as claimed in claim 2, characterized in that one of the one pair of the sticks and the one pair of the head units is formed with a plurality of binding projections projecting towards the other pair, the other pair being formed with binding slots to be coupled to the plurality of binding projections.

[10] The nunchaku as claimed in claim 9, characterized in that the plurality of binding projections are formed on the one pair of head units, and the plurality of binding slots are formed on the one pair of rods, and in that the side where the plurality of binding slots are formed is arranged on a position lower than the upper side of the first support.

[11] A nunchaku, characterized by comprising: a pair of sticks to enable a user to hold the nunchaku; a pair of head units removably coupled to each end of the one pair of rods; a connection cord for connecting the one pair of head units; and a cord length adjustment means coupled to at least one of the one pair of sticks and the one pair of head units and for adjusting the length of the connection cord.

[12] The nunchaku as claimed in claim 11, characterized in that the cord length adjustment means comprises: a flare-type cord chucking unit provided in at least one of the one pair of head units, and formed with a chucking means for chucking the connection cord on the inner side thereof; and a unit pressing means coupled to one end of the connection cord, removably coupled to the cord chucking unit and for pressing the cord chucking unit so that the chucking means of the cord chucking unit can chuck the connection cord when coupled to the cord chucking unit.

[13] The nunchaku as claimed in claim 12, characterized in that the outer side of the cord chucking unit is formed with a first curved part of which the cross section gradually becomes smaller as it goes downward and in that the inner side of the unit pressing means is formed with a second curved part for pressing the first curved part towards the inside in the radius direction.

[14] The nunchaku as claimed in claim 13, characterized in that the end of the second curved part is formed with a stop, and the cord chucking unit is formed with a release blocking unit for blocking the stop on the unit pressing means from being unintentionally released.

[15] The nunchaku as claimed in claim 11, characterized in that one end of the one pair of sticks is formed with an insertion counterpart in which an insertion part of the protruding end in the unit pressing means is inserted.

[16] The nunchaku as claimed in claim 11, characterized in that one of the one pair of sticks and the one pair of the head units is formed with a female screw and the other thereof is formed with a male screw for releasing and coupling the sticks from/to the one pair of head units. [17] The nunchaku as claimed in claim 11, characterized in that each end of the one pair of head units is provided with a conical cord rotation unit for easy rotation of the connection cord.