US20150314181A1 - Kendama - Google Patents
Kendama Download PDFInfo
- Publication number
- US20150314181A1 US20150314181A1 US14/408,162 US201314408162A US2015314181A1 US 20150314181 A1 US20150314181 A1 US 20150314181A1 US 201314408162 A US201314408162 A US 201314408162A US 2015314181 A1 US2015314181 A1 US 2015314181A1
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- US
- United States
- Prior art keywords
- attachable
- kensaki
- detachable member
- kendama
- detachable
- 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.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B67/00—Sporting games or accessories therefor, not provided for in groups A63B1/00 - A63B65/00
- A63B67/20—Games using a bat or racket with a ball or other body tethered thereto
- A63B67/205—Games using a bat or racket with a ball or other body tethered thereto the bat having one or more spigots for catching bodies having a bore, e.g. rings
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
- A63B59/30—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00 forming hand-held throwing or catching aids for use with rings, discs, wheels or cylindrical throwing-bodies, or for use with balls having a central bore
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B67/00—Sporting games or accessories therefor, not provided for in groups A63B1/00 - A63B65/00
- A63B67/10—Games with thread-suspended or swingably-mounted bodies, e.g. balls, pointed bodies shaped as birds, animals, or the like, for aiming at and hitting targets ; Games using tethered bodies, e.g. balls, not otherwise provided for
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B67/00—Sporting games or accessories therefor, not provided for in groups A63B1/00 - A63B65/00
- A63B67/20—Games using a bat or racket with a ball or other body tethered thereto
- A63B67/22—Games using a bat or racket with a ball or other body tethered thereto the bat or racket having one or more holes or pockets therein, e.g. for catching or collecting the ball; the bat comprising a ring or cup having a handle
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
- A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
- A63B2071/0694—Visual indication, e.g. Indicia
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
- A63B2220/80—Special sensors, transducers or devices therefor
- A63B2220/806—Video cameras
Definitions
- the present invention relates to a kendama.
- Kendama is a toy enjoyed through the ages. The number of people recently increases who play kendama as a game. Kendama has various shapes. However, one including a sword 100 (ken), a ball 200 (tama), and a string 300 , for example see patent document 1, is common in contemporary Japan.
- FIG. 17 is a front view illustrating a common kendama existing before.
- the ken 100 has a shape of a cross in front view configured by a sword shaft 110 (kenjiku) having a shape of a stick and a cross-piece 120 (sarado) having a shape of a tsutsumi (Japanese hand drum).
- a portion 111 protruding to an upper side than the cross-piece 120 in the sword shaft 110 is referred to as a “kensaki” (tip of sword).
- the tama 200 is provided with a hole 210 for inserting the kensaki 111 .
- a large cup 121 is provided on as plane of one end of the cross-piece 120 .
- a small cup 122 is provided on a plane of another end of the cross-piece 120 .
- a middle cup 116 is provided on a lower end plane of the sword shaft 110 .
- the large cup 121 , the small cup 122 , and the middle cup 116 are configured to be able to receive the ball 200 .
- Japanese Kendama Association which holds lots of kendama contests, certifies the kendama having as shape illustrated in FIG. 17 as an official one.
- a prior kendama is problematic in that a tip portion of the kensaki 111 is easy to be worn by an impact given by the ball and others.
- Players who play kendama as a game have to uneconomically buy new kendama as a whole if the kensaki 111 is worn even though other portions are intact.
- a balance of weight of the sword 110 and others affect a difficulty of techniques, especially a difficulty of swinging type techniques such as a “Hikoki (air plane)” in which the ball 200 is supported and the sword 110 is swung.
- the balance of weight cannot be adjusted in a prior kendama. Difficulty of a specific technique cannot be make both or low.
- Kendama having a configuration that a portion corresponds to the kensaki is attached or detached is proposed before.
- a set of industrial tools having a shape of kendama in which kinds of bit are attached to a chuck ( 8 ) provided on a tip of bit attaching portion ( 7 ) is illustrated in FIG. 1 of Patent Document 2.
- the bit attached to the chuck ( 8 ) is a cross slot screwdriver, straight slot screw driver or others, which are attached when it is used as an industrial tool, and which are not used as the kensaki when it is used as a kendama.
- a toy having a ball is illustrated in FIG. 1 of Patent Document 3, in which a ball receiver ( ) is screwed on an upper end of a shaft ( ).
- a portion corresponding to the kensaki is a pointed shaft ( ).
- Patent Document 3 is silent about making the pointed shaft ( ) attachable and detachable.
- Kendama is illustrated in FIG. 3 of Patent Document 4, in which a horn ( 7 ) is fitted into a middle portion of an upper face of a cross-piece. However, if a configuration of fitting the horn ( 7 ) into the cross-piece is adapted, the horn is possibly dropped when a ball ( 1 ) hits the horn ( 7 ).
- Patent Document 4 is silent about exchanging horn ( 7 ) with another member.
- a to having a ball is illustrated in Figs of Patent Document 5, in which a kensaki ( 6 ) is screwed into a middle portion of a ball receiver ( 1 ) having a shape of a tsutsumi (Japanese hand drum).
- Patent Document 5 is also silent about exchanging the kensaki ( 6 ) with another member. Balance of weight of the sword cannot be adjusted with kendamas disclosed in Patent Documents 2 to 5.
- Patent Document 1 Japanese Patent Application Publication No. 2002-346011
- Patent Document 2 Japanese Utility Patent Application Publication No. H01-132383
- Patent Document 3 Japanese Utility Patent Examined Application Publication No. S03-007398
- Patent Document 5 Japanese Utility Patent Examined Application Publication No. S12-016699
- the present invention is to solve the problem described above.
- the present invention provides a kendama realizing
- the problems are solved by a kendama.
- the kendama includes a sword having a sword shaft and as cross-piece; a ball having a hole of inserting a kensaki protruding to an upper side than the cross-piece in the sword shaft; as string connecting the sword and the ball.
- a tip portion of the kensaki is configured as an attachable and detachable member which is attachable and detachable with respect to a base end of the kensaki.
- the attachable and detachable member is a plurality of attachable and detachable members replaced each other.
- all of the plurality of attachable and detachable members are the same (members for replacing a first attachable and detachable member is worn), it is preferable that at least two attachable and detachable members out of the plurality of attachable and detachable members differ in at least any one item or more items out of a weight, shape, and color. According to this, difficulty of a technique using the kendama is changed and a novel technique is performed by adjusting a balance of weight, and/or changing the shape and/or color of the sword.
- the plurality of attachable and detachable member is configured as follows.
- the attachable and detachable member is a attachably and detachably attached to the base end of the kensaki
- specific configurations are not particularly limited in the present invention.
- a fitting and inserting hole is provided on a tip end plane of the base end of the kensaki, and the attachable and detachable member has a shaft portion to be inserted and fitted to the fitting and inserting hole.
- a retaining portion is provided on the shaft portion, and the retaining portion is configured by annularly providing an elastic protrusion along an outer peripheral face of the shaft portion.
- a shaft portion is provided on the tip end plane of the base end of the kensaki, and the attachable and detachable member has a fitting and inserting hole to insert and fit the shaft portion.
- a thread groove is provided on an inner peripheral face of the fitting and inserting hole of the attachable and detachable member, the thread groove threadably mounts an outer peripheral face of the shaft portion on the base end of the kensaki.
- a weight of the attachable and detachable member can be changed by modifying a length of the shaft portion (see reference numeral 112 b of FIG. 2 and FIG. 5 ) without modifying material of the attachable and detachable member and as shape of a portion (head portion) appeared outside when the attachable and detachable member is attached to the kensaki.
- a weight member (see reference numeral 400 of FIG. 6 ) is contained in the fitting and inserting hole to adjust a weight of the kensaki.
- the weight of the kensaki is changed to adjust a balance of weight of the kensaki by selecting an existence or non-existence, or a kind and the number of the weight member.
- a cushioning material (see reference numeral 500 of FIG. 6 ) is contained at a bottom portion of the fitting and inserting hole.
- FIG. 1 is a front view illustrating a kendama of a present invention in which a standard attachable and detachable member is attached to a kensaki.
- FIG. 2 is a magnified view illustrating a flow of attaching a standard attachable and detachable member to a tip portion of a kensaki, according to the present invention.
- FIG. 3 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a different color to a tip portion of a kensaki, according to the present invention.
- FIG. 4 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a shaft portion provided with a thread ridge to a tip portion of a kensaki, according to the present invention.
- FIG. 5 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a shaft portion of a different size to a tip portion of a kensaki, according to the present invention.
- FIG. 6 is a magnified view illustrating a flow of making a fitting and inserting hole provided on a base end of a kensaki contain a weight member, according to the present invention.
- FIG. 7 is a drawing explaining a difficulty change brought by a change of balance of weight when performing as technique called “Getsumen Chakuriku (landing on the moon)”.
- FIG. 8 is a drawing explaining a difficulty change brought by a change of balance of weight when performing a technique called “Hikoki (air plane)”.
- FIG. 9 is a drawing explaining a difficulty change brought by a change of balance of weight when performing a technique called “Toudai (beacon)”.
- FIG. 10 is a magnified view illustrating a flow of attaching a truncated attachable and detachable member to a tip portion of a kensaki, according to the present invention.
- FIG. 11 is a magnified view illustrating a flow of attaching an attachable and detachable member having slit groove to a tip portion of a kensaki, according to the present invention.
- FIG. 12 is a drawing illustrating a state in which a technique is performed using a kendama attached with the attachable and detachable member having slit groove.
- FIG. 13 is as magnified view illustrating a flow of attaching an attachable and detachable member having string hole to a tip portion of a kensaki, according to the present invention.
- FIG. 14 is a magnified view illustrating a flow of attaching a connecting type attachable and detachable member to a tip portion of a kensaki, according to the present invention.
- FIG. 15 is as drawing illustrating a state in which the connecting type attachable and detachable member is attached to the kensaki to connect each kensaki of two kendamas.
- FIG. 16 is a magnified view illustrating a flow of attaching an attachable and detachable member embedded with camera to a tip portion of a kensaki, according to the present invention.
- FIG. 17 is a front view illustrating a common kendama existing before.
- FIG. 18 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a fitting and inserting hole provided with a thread groove to a tip portion of a kensaki, according to the present invention.
- FIG. 1 is a front view illustrating a kendama of a present invention in which a standard attachable and detachable member 112 is attached to a kensaki 111 .
- the kendama of the present embodiment is configure by a sword 100 , a ball 200 , and a string 300 .
- the sword 100 is configured by a sword shaft 110 , and a cross piece 120 .
- the ball 200 is provided with a hole 210 of inserting a kensaki 111 protruding to an upper side than the cross-piece 120 in the sword shaft 110 .
- a tip portion of the kensaki 111 is configured as an attachable and detachable member 112 which is attachable and detachable with respect to a base end of the kensaki 111 .
- the kendama of the present embodiment is provided with six kinds as the attachable and detachable members 112 , which are a standard attachable and detachable member 112 ( FIG. 2 ), a truncated attachable and detachable member 112 ( FIG. 10 ), an attachable and detachable member 112 having slit groove ( FIG. 11 ), an attachable and detachable member 112 having string hole ( FIG. 13 ), a connecting type attachable and detachable member 112 ( FIG. 14 ), and an attachable and detachable member 112 embedded with camera ( FIG. 16 ).
- These six attachable and detachable members 112 are interchanged each other. These six attachable and detachable members 112 are specifically explained later.
- attachable and detachable members 112 are an example. Some of these attachable and detachable members 112 may be omitted, or an attachable and detachable member 112 other than the six kinds of attachable and detachable members 112 may be added to.
- a string hole 123 connecting the string 300 to the sword 100 side is provided on an slight upper side than a center with respect to width and upper and lower direction of the cross piece 120 in as common kendama as illustrated in FIG. 17 , it is provided on a position where a base of the kensaki 111 and the cross-piece 120 connect.
- friction given to the string 300 from the sword is reduced to prevent the string 300 from breaking. It facilitates one to perform techniques called “Hikoki” and “Toudai” explained later because balance of the sword 100 is improved. Difficulty of techniques can also be changed by shifting leftwardly or rightwardly position of the string hole from the center with respect to width and upper and lower direction of the cross piece 120 .
- FIG. 2 is a magnified view illustrating a flow of attaching the standard attachable and detachable member 112 to the tip portion of the kensaki 111 .
- the kensaki 111 is illustrated as a cross section cut on a plane on which a center axis lies ( FIGS.
- kensaki 111 shape of a tip portion of as kensaki 111 is hemispheric (or a circular cone).
- the tip of the kensaki 111 becomes a hemispheric shape to be used as a common kendama such as one illustrated in FIG. 17 .
- plurality of the standard attachable and detachable member is provided since it is used very often and tend to be worn.
- the head portion 112 a is exposed outer side after the attachable and detachable member 112 is attached to the kensaki 111 .
- Color of the head portion 112 a is normally the same as the kensaki 111 , it is preferable that various ones having different colors are provided even though attachable and detachable members 112 belong to the same type, as illustrated in FIG. 3 .
- FIG. 3 is a magnified view illustrating a flow of attaching a standard attachable and detachable member 112 having a different color to a tip portion of a kensaki 111 .
- difficulty of techniques can be changed. For example, if an outstanding color such as red is adapted, the head portion 112 a becomes more outstanding than other portions to facilitate one to successfully perform a technique in which the kensaki 111 is inserted into the hole 210 of the ball 200 .
- Material of the head portion 112 a is not particularly limited if it has a sufficient strength as the tip portion of the kensaki 111 .
- Plastics, rubbers, metals, woods are exemplified as material of the head portion 112 a. It is not particularly problematic if material easy to be worn such as woods is used since the kendama of the present embodiment is maintained by interchanging the attachable and detachable member 112 .
- all of the head portions 112 a of the attachable and detachable members 112 are made of polyethylene, which is inexpensive and easy to shape.
- the shaft portion 112 b is explained.
- the shall portion 112 b is a portion to be fitted and inserted to a fitting and inserting hole 111 a provided on the kensaki 111 to attach the attachable and detachable member 112 to the kensaki 111 .
- the shaft portion 112 b is not particularly limited if it has a structure to be fitted and inserted and fixed to the fitting and inserting hole 111 a.
- the fitting and inserting hole 111 a may be a threaded hole and a thread ridge 112 d may be provided on an outer peripheral face of the shaft portion 112 b to screw the attachable and detachable members 112 to as tip portion of a kensaki 111 as illustrated in FIG. 4 .
- FIG. 4 is a magnified view illustrating a flow of attaching a standard attachable and detachable member 112 having a shaft portion provided with a thread ridge 112 d to at tip portion of it kensaki 111 . According to a threadably mounting structure of FIG.
- a standard attachable and detachable member 122 c having a pattern or a standard attachable and detachable member 122 c having a head portion 112 a whose shape is different depending on a direction is used, the head portion 112 a does not come to desired direction when screwing a shall potion 112 b to a fitting and inserting hole 111 a, unless thread groove of the fitting and inserting hole 111 a and the thread ridge 112 d of the shaft portion 112 b are processed at high accuracy. This is not much problematic if a standard attachable and detachable member having no pattern is used. Considering this, a shaft portion 112 b is made as follows in the kendama of the present embodiment.
- the shaft portion 112 b is provided with a retaining portion 112 c instead of the thread ridge as illustrated in FIG. 2 .
- the inserting and fitting hole 111 a is not the threaded hole.
- the retaining portion 112 c is configured by annularly providing an elastic protrusion along an outer peripheral face of the shaft portion 112 b, and closely contacts to an inner peripheral face of the fitting and inserting hole 111 a when the shaft portion 112 b is fitted and inserted into the fitting and inserting hole 111 a to prevent the shaft portion 112 b from being dropped out of the fitting and inserting hole 111 a.
- the retaining portion 112 c is normally made of elastic materials such as rubbers.
- the retaining portion 112 c and the shaft portion 112 b may be integrally formed at the same time. If they are formed of different materials, the retaining portion 112 c and the shaft portion 112 b are formed as separate body. In this case, the retaining portion 112 c is provided by externally fitting to the shaft portion 112 c or integrally shaping a different material with respect to the shaft portion 112 c. In this case, the retaining portion 112 c is prevented from being dropped out of the shaft portion 112 b by circularly providing a groove on the outer peripheral face of the shaft portion 112 b and positioning the retaining portion 112 c at this portion.
- a cross sectional shape perpendicular to a longitudinal direction of the fitting and inserting hole 111 a and the shaft portion 112 b is a true circle in the kendama of the present embodiment.
- the cross sectional shape of the shaft portion, 112 b and the fitting and inserting hole 111 a may be as non-circular shape such as a polygonal shape, an oval shape, or others.
- a shaft portion 112 b of an attachable and detachable member attached to as tip portion of a kensaki 111 is prevented from rotating by engaging a shaft portion 112 b to an fitting and inserting hole 111 a.
- This configuration is not adaptable in the threadably mounting structure of FIG. 4 , and becomes adaptable with a shaft portion 112 b having as fitting and inserting structure as illustrated in FIG. 2 .
- This configuration is preferably adapted if an attachable and detachable member 112 should not be rotated such as when using the attachable and detachable member 112 having slit ( FIG. 11 ) or the connecting type attachable and detachable member 112 which are explained later.
- Materials of the shaft portion 112 b is not particularly limited if it has a sufficient strength. Plastics, rubbers, metals, woods are exemplified as materials of the shaft portion 112 b .
- the shaft portion 112 b may be made of a material an as the head potion 112 b, or may be made of a different material.
- the standard detachable and detachable members 112 three kinds are provided, one of which is a light weight type whose shaft portion 112 b is made of polyethylene another is a middle weight type whose shaft portion 112 b is made of a plastic of acrylonitrile butadiene styrene (ABS), the other is heavy weight type whose shaft portion 112 b is made of a plastic of polyoxymethlene (Duracon, registered trademark).
- the shaft portion 112 b is made heavier by shaping the shaft portion 112 b with a metal or embedding a heavy material such as metals to an inside of the shaft portion 112 b.
- Weight of the tip portion of the kensaki 111 can be adjusted by providing various ones having shaft portions 112 differed in a weight even with the same type attachable and detachable members 112 .
- Weight of the tip portion of the kensaki 111 is also adjusted by providing various ones having a different size such as a length of the shaft portion 112 b even with the same type attachable and detachable member 112 , as illustrated in FIG. 5 .
- FIG. 5 is as magnified view illustrating a flow of attaching a standard attachable and detachable member 112 having a shaft portion 112 b of a different size to a tip portion of a kensaki 111 .
- Weight of a tip portion of a kensaki 111 is also adjusted by containing a weight member 400 in a fitting and inserting hole 111 a as illustrated in FIG. 6 .
- FIG. 5 is as magnified view illustrating a flow of attaching a standard attachable and detachable member 112 having a shaft portion 112 b of a different size to a tip portion of a kensaki 111 .
- Weight of a tip portion of a kensaki 111 is also adjusted by
- FIG. 6 is a magnified view illustrating a flow of making a fitting and inserting hole 111 a provided on a base end of a kensaki 111 contain a weight member 400 .
- a trouble possibly occurs such as a rattling sound generated by the weight member 400 vibrating in the fitting and inserting hole 111 , or an instability of the balance of weight of the sword 110 , it is preferable that a cushioning material 500 (see reference numeral 500 of FIG. 6 ) is contained at a bottom portion of the fitting and inserting hole 111 a.
- FIG. 18 is as magnified view illustrating a flow of attaching the standard attachable and detachable member 112 having a fitting and inserting hole 112 i provided with a thread groove 112 j to a tip portion of as kensaki 111 .
- a thread groove 112 j is provided on an inner peripheral face of the fitting and inserting hole 112 i which threadably mounts an outer peripheral face of the shaft portion 111 b, the attachable and detachable member 112 can be screwed on the kensaki 111 .
- a threaded shaft is used as the shaft portion 111 b.
- balance of weight of the sword 100 is adjusted even with the same type attachable and detachable member 112 (for example with the same standard attachable and detachable member 112 ) by selecting a head portion 112 a, materials or size of the shaft potion 112 b, a kind or existence or non-existence of the weight member 400 to change a weight of the kensaki 111 .
- Difficulty of a specific technique is changed by selecting an attachable and detachable member 112 or as weight member to be used without changing a kendama to be used. Difficulty change of technique brought by change of balance of weight of a sword is explained below raising examples.
- Getsumen Chakuriku (landing on the moon)
- Getsumen Chakuriku is a technique in which the ball 200 is held, a sword 100 is swung to upside, the sword 10 is put on the ball 200 so that a large cup 121 (or a small cup 122 ) of a cross-piece 120 contacts to the ball 200 as illustrated in FIG. 7 .
- FIG. 7 is a drawing explaining a difficulty change brought by a change of balance of weight when performing Getsumen Chakuriku.
- weight of the sword 100 on the ball 200 is balanced at relatively horizontal laid position since a weight center of the sword 100 shifts to the kensaki 111 side, as illustrated in left side of FIG. 7 . This facilitates one to successfully perform the technique.
- weight of the sword 100 on the ball 200 is balanced at relatively vertical standing position since a weight center of the sword 100 shifts to a kenjiri (base end of a sword) 114 side, as illustrated in right side of FIG. 7 . This prevents one from successfully performing the technique.
- Hikoki air plane
- a sword 100 is swung up half (or swung plural times) to be inverted by making the ball 200 as a center, its kensaki 111 is inserted into the hole 210 , as illustrated with arrow A in FIG. 8 .
- FIG. 8 is a drawing explaining a difficulty change brought by a change of balance of weight when performing a technique called “Hikoki”.
- the kensaki 111 is heavy when performing Hikoki, an angular velocity of the sword 100 becomes high when swinging up the sword 100 (rotating rate becomes high) since a weight center of the sword 100 becomes close to a rotation center (the ball 200 ) of the sword 100 . This prevents one from successfully performing the technique.
- the kensaki is light, an angular velocity of the sword 100 becomes low when swinging up the sword 100 (rotating rate becomes low) since a weight center of the sword 100 becomes away from a rotation center (the ball 200 ) of the sword 100 . This facilitates one to successfully perform the technique.
- Toudai (beacon)
- Toudai is a technique in which a ball 200 is held, a sword 100 is lifted up, the sword 10 is put on the ball 200 so that a middle cup 116 contacts to the ball 200 as illustrated with arrow B in FIG. 9 .
- FIG. 9 is a drawing explaining as difficulty change brought by a change of balance of weight when performing a technique called “Toudai”. If a kensaki 111 is heavy when performing Toudai, a posture of the pulled up sword 100 becomes unstable since a weight center of the sword 100 comes to high position. This prevents one from successfully performing the technique. In contrast to this, if the kensaki 111 is light, a posture of the pulled up sword 100 becomes stable since a weight center of the sword 100 comes to lower position. This facilitates one to successfully perform the technique.
- the number of steps modifying weight (total weight of an attachable and detachable member 112 and a weight member 400 ) of the tip portion of the kensaki 111 is not particularly limited. It is normally two steps or more, and preferably three steps or more, and not more than ten to twenty steps. Adjusting range of a weight of a tip portion (an attachable and detachable member 112 ) of a kensaki 111 is not particularly limited, either.
- Weight adjusting width (adjusting weight by how much gram) is not particularly limited, either. It is normally by 0.5 g or more, and is preferably 1 g or more, and not more than by 50 to 100 g or so.
- FIG. 10 is a magnified view illustrating a flow of attaching the truncated attachable and detachable member 112 to the tip portion of the kensaki 111 .
- the truncated attachable and detachable member 112 configures its head portion 112 a as a circular truncated cone as illustrated in FIG. 10 .
- the head portion 112 a of the truncated attachable and detachable member 112 has a shape truncating top portion of the head portion 112 b (see FIG. 2 ) of a standard attachable and detachable member 112 .
- the tip portion of the kensaki 111 becomes a shape of a circular truncated cone by attaching the truncated attachable and detachable member 112 .
- Novel techniques which cannot be performed with a common kendama can be performed, such as a technique in which the ball 200 is put on the tip portion of the kensaki 111 , a technique making the inverted sword stand on the ball 200 (a technique in which a tip portion of a kensaki 111 is put on a ball 200 ), or a technique making the inverted sword stand on a hand or a finger (a technique in which the up portion of the kensaki 111 is put on a hand or a finger).
- a top portion of the truncated attachable and detachable member 112 spherically concaves at a radius of curvature same as the ball 200 to facilitate to receive the ball 200 with the portion, according to the kendama of the present embodiment. Since configurations, which are not specifically referred here such as a structure of a shaft portion 112 b of the truncated attachable and detachable member 112 and materials consisting each portions, is same as those of the standard attachable and detachable member 112 explained above, an explanation is omitted.
- FIG. 11 is a magnified view illustrating a flow of attaching the attachable and detachable member having slit groove to the tip portion of the kensaki.
- FIG. 12 is a drawing illustrating a state in which a technique is performed using a kendama attached with the attachable and detachable member having slit groove. As illustrated in FIG. 11 , in the attachable and detachable member 112 having slit groove, its head portion 112 a is provided with a slit groove 112 e.
- the slit groove 112 a is provided along an upper face of the head potion 112 a from a front side to a rear side of the head portion 112 a. As illustrated in FIG. 12 , the slit groove 112 e makes it possible to catch the string 300 and to performing novel technique applying this. Since configurations, which are not specifically referred with respect to the attachable and detachable member 112 having slit groove such as a structure of a shall portion 112 b of the attachable and detachable member 112 having slit groove and materials consisting each portions, are same as those of the standard attachable and detachable member 112 explained above, an explanation is omitted.
- the attachable and detachable member 112 having slit groove may be combined with the truncated attachable and detachable member 112 to make a hybrid type.
- FIG. 13 is a magnified view illustrating a flow of attaching the attachable and detachable member 112 having string hole to the tip portion of the kensaki 111 .
- the attachable and detachable member 112 is provided with a string hole 112 f perforating a head portion 112 a from one side to other side.
- the string 300 is connected to make a loop.
- FIG. 14 is a magnified view illustrating a flow of attaching the connecting type attachable and detachable member 112 to the tip portion of the kensaki 111 .
- FIG. 15 is a drawing illustrating a state in which the connecting type attachable and detachable member 112 is attached to the kensaki 111 to connect each kensaki 111 of two kendamas. In as portion where the kensaki 111 and its vicinity are illustrated as magnified manner in FIG. 15 , the kensaki 111 is illustrated as a cross section cut on a plane on which a center axis lies.
- the connecting type attachable and detachable member 112 has a configuration of a shaft portion 112 b being extended until a portion corresponding to the head portion 112 a of the standard attachable and detachable member 112 , an upper half of the shaft portion 112 b projecting out of a fitting and inserting hole 111 a when the shaft portion 112 b being fitted and inserted into the fitting and inserting hole 111 a, as illustrated in FIG. 14 .
- the tip portion of the kensaki 111 of one kendama can be connected to a tip portion of a kensaki 111 of another kendama. According to this, novel techniques, which cannot be performed with a common kendama, can be performed.
- FIG. 16 is a magnified view illustrating a flow of attaching the attachable and detachable member 112 embedded with camera to a tip portion of as kensaki 111 .
- its head portion 112 a is embedded with a small camera 112 g to take a movie at an eye point of as top portion of the head portion 112 a. This makes it possible to take a movie of a technique of kendama at a novel eye point not existing before.
- a cable 112 h which supply a power to the small camera 112 g or outputting data of a movie taken with the small camera 112 g, is extending from a lower end portion of the small camera 112 g.
- the cable 112 h goes through a shaft portion 112 b of the attachable and detachable member 112 to be contained in a fitting and inserting hole 111 a.
- a power source supplying the small camera 112 g (not illustrated in Figs.) with a power and a memory (not illustrated in Figs.) storing data of movies taken with the small camera 112 g can be contained in a cavity portion of a sword shaft 110 or as a cross-piece 120 .
- attachable and detachable member 112 embedded with camera such as a structure of a shaft portion 112 b of the attachable and detachable member 112 embedded with camera and materials consisting each portions, are same as those of the standard attachable and detachable member 112 explained above, an explanation is omitted.
- the attachable and detachable member 112 embedded with camera may be combined with the truncated attachable and detachable member 112 , the attachable and detachable member 112 having a slit groove, or the attachable and detachable member 112 having string hole to make a hybrid type.
Abstract
This disclosure provides a kendama not only replacing only a kensaki if the kensaki is worn, but also adjusting a balance of weight and others of a sword and developing a novel technique largely different from existing techniques. A kendama includes a sword having a sword shaft and a cross-piece; a ball having a hole of inserting a kensaki protruding to an upper side than the cross-piece in the sword shaft; and a string connecting the sword and the ball. A tip portion of the kensaki is configured as an attachable and detachable member which is attachable and detachable with respect detachable members replaced each other.
Description
- The present invention relates to a kendama.
- Kendama is a toy enjoyed through the ages. The number of people recently increases who play kendama as a game. Kendama has various shapes. However, one including a sword 100 (ken), a ball 200 (tama), and a
string 300, for example see patent document 1, is common in contemporary Japan.FIG. 17 is a front view illustrating a common kendama existing before. Theken 100 has a shape of a cross in front view configured by a sword shaft 110 (kenjiku) having a shape of a stick and a cross-piece 120 (sarado) having a shape of a tsutsumi (Japanese hand drum). Aportion 111 protruding to an upper side than thecross-piece 120 in thesword shaft 110 is referred to as a “kensaki” (tip of sword). Thetama 200 is provided with ahole 210 for inserting thekensaki 111. Alarge cup 121 is provided on as plane of one end of thecross-piece 120. Asmall cup 122 is provided on a plane of another end of thecross-piece 120. Amiddle cup 116 is provided on a lower end plane of thesword shaft 110. Thelarge cup 121, thesmall cup 122, and themiddle cup 116 are configured to be able to receive theball 200. Japanese Kendama Association, which holds lots of kendama contests, certifies the kendama having as shape illustrated inFIG. 17 as an official one. - However, a prior kendama is problematic in that a tip portion of the
kensaki 111 is easy to be worn by an impact given by the ball and others. Players who play kendama as a game have to uneconomically buy new kendama as a whole if thekensaki 111 is worn even though other portions are intact. A balance of weight of thesword 110 and others affect a difficulty of techniques, especially a difficulty of swinging type techniques such as a “Hikoki (air plane)” in which theball 200 is supported and thesword 110 is swung. However, the balance of weight cannot be adjusted in a prior kendama. Difficulty of a specific technique cannot be make both or low. It is impossible to gradually shift to as balance of weight of lower difficulty to a balance of weight of high difficulty in order to master a specific technique. Since many techniques are already existing, developing new techniques is in an extent of minor changing existing techniques. It is difficult to develop a novel techniques with as prior kendama. - Kendama having a configuration that a portion corresponds to the kensaki is attached or detached is proposed before. A set of industrial tools having a shape of kendama in which kinds of bit are attached to a chuck (8) provided on a tip of bit attaching portion (7) is illustrated in FIG. 1 of Patent Document 2. However, the bit attached to the chuck (8) is a cross slot screwdriver, straight slot screw driver or others, which are attached when it is used as an industrial tool, and which are not used as the kensaki when it is used as a kendama. A toy having a ball is illustrated in FIG. 1 of Patent Document 3, in which a ball receiver () is screwed on an upper end of a shaft (). However, a portion corresponding to the kensaki is a pointed shaft (). Patent Document 3 is silent about making the pointed shaft () attachable and detachable.
- Kendama is illustrated in FIG. 3 of Patent Document 4, in which a horn (7) is fitted into a middle portion of an upper face of a cross-piece. However, if a configuration of fitting the horn (7) into the cross-piece is adapted, the horn is possibly dropped when a ball (1) hits the horn (7). In addition, Patent Document 4 is silent about exchanging horn (7) with another member. A to having a ball is illustrated in Figs of Patent Document 5, in which a kensaki (6) is screwed into a middle portion of a ball receiver (1) having a shape of a tsutsumi (Japanese hand drum). Patent Document 5 is also silent about exchanging the kensaki (6) with another member. Balance of weight of the sword cannot be adjusted with kendamas disclosed in Patent Documents 2 to 5.
- Patent Document 1: Japanese Patent Application Publication No. 2002-346011
- Patent Document 2: Japanese Utility Patent Application Publication No. H01-132383
- Patent Document 3: Japanese Utility Patent Examined Application Publication No. S03-007398
- Patent Document Japanese Patent Application Publication No. 2002-360754
- Patent Document 5: Japanese Utility Patent Examined Application Publication No. S12-016699
- Present invention is to solve the problem described above. The present invention provides a kendama realizing;
- (1) replacing only a kensaki if the kensaki is worn,
- (2) adjusting a balance of weight and others of a sword,
- (3) developing a novel technique largely different from existing techniques.
- The problems are solved by a kendama. The kendama includes a sword having a sword shaft and as cross-piece; a ball having a hole of inserting a kensaki protruding to an upper side than the cross-piece in the sword shaft; as string connecting the sword and the ball. A tip portion of the kensaki is configured as an attachable and detachable member which is attachable and detachable with respect to a base end of the kensaki. The attachable and detachable member is a plurality of attachable and detachable members replaced each other.
- Although all of the plurality of attachable and detachable members are the same (members for replacing a first attachable and detachable member is worn), it is preferable that at least two attachable and detachable members out of the plurality of attachable and detachable members differ in at least any one item or more items out of a weight, shape, and color. According to this, difficulty of a technique using the kendama is changed and a novel technique is performed by adjusting a balance of weight, and/or changing the shape and/or color of the sword.
- For example, as for the shape, it is preferable that the plurality of attachable and detachable member is configured as follows.
- (1) At least one attachable and detachable member is of configuring a shape of the tip portion of the kensaki as a hemisphere or circular cone. The attachable and detachable member having this configuration is sometimes referred to as “standard attachable and detachable member”.
- (2) At least one attachable and detachable member is of configuring as shape of the tip portion of the kensaki as a circular truncated cone (top portion of the standard attachable and detachable member is truncated). The attachable and detachable member having this configuration is sometimes referred to as “truncated attachable and detachable member”.
- (3) At least one attachable and detachable member is of providing as slit groove catching the string with the tip portion of the kensaki. The attachable and detachable member having this configuration is sometimes referred to as “attachable and detachable member having slit groove”.
- (4) At least one attachable and detachable member is of providing a string hole connecting the string to the tip portion of the kensaki. The attachable and detachable member having this configuration is sometimes referred to as “attachable and detachable member having string hole”.
- (5) At least one attachable and detachable member is of connecting a kensaki of another kendama to the tip portion of the kensaki. The attachable and detachable member having this configuration is sometimes referred to as “connecting type attachable and detachable member”.
- (6) At least one attachable and detachable member is of attaching a small camera to the tip portion of the kensaki. The attachable and detachable member having this configuration is sometimes referred to as “attachable and detachable member embedded with camera”. The standard attachable and detachable member, the truncated attachable and detachable member, the attachable and detachable member having slit groove, the connecting type attachable and detachable member, and the attachable and detachable member embedded with camera are explained in detail later.
- As long as the attachable and detachable member is a attachably and detachably attached to the base end of the kensaki, specific configurations are not particularly limited in the present invention. However, it is preferable that a fitting and inserting hole is provided on a tip end plane of the base end of the kensaki, and the attachable and detachable member has a shaft portion to be inserted and fitted to the fitting and inserting hole. In this case, it is preferable that a retaining portion is provided on the shaft portion, and the retaining portion is configured by annularly providing an elastic protrusion along an outer peripheral face of the shaft portion. Alternatively, it is preferable that a shaft portion is provided on the tip end plane of the base end of the kensaki, and the attachable and detachable member has a fitting and inserting hole to insert and fit the shaft portion. In this case, it is preferable that a thread groove is provided on an inner peripheral face of the fitting and inserting hole of the attachable and detachable member, the thread groove threadably mounts an outer peripheral face of the shaft portion on the base end of the kensaki. By adapting these configurations, the attachable and detachable member can be securely attached to the base end of the kensaki and be easily attached or detached. Since the structure is simple, a manufacturing cost of the kendama can be reduced. A weight of the attachable and detachable member can be changed by modifying a length of the shaft portion (see
reference numeral 112 b ofFIG. 2 andFIG. 5 ) without modifying material of the attachable and detachable member and as shape of a portion (head portion) appeared outside when the attachable and detachable member is attached to the kensaki. - In case the fitting and inserting hole is provided on tip end plane of the base end of the kensaki or the fitting and inserting hole is provided on the attachable and detachable member, it is preferable that a weight member (see
reference numeral 400 ofFIG. 6 ) is contained in the fitting and inserting hole to adjust a weight of the kensaki. The weight of the kensaki is changed to adjust a balance of weight of the kensaki by selecting an existence or non-existence, or a kind and the number of the weight member. In this case, if the weight member is directly inserted, a trouble possibly occurs such as a rattling sound generated by the weight member vibrating in the fitting and inserting hole, or an instability of the balance of weight of the sword, it is preferable that a cushioning material (seereference numeral 500 ofFIG. 6 ) is contained at a bottom portion of the fitting and inserting hole. - According to the present invention, a kendama realizing following is provided;
- (1) replacing only a kensaki if the kensaki is worn,
- (2) adjusting a balance of weight and others of a sword,
- (3) developing a novel technique largely different from existing techniques.
-
FIG. 1 is a front view illustrating a kendama of a present invention in which a standard attachable and detachable member is attached to a kensaki. -
FIG. 2 is a magnified view illustrating a flow of attaching a standard attachable and detachable member to a tip portion of a kensaki, according to the present invention. -
FIG. 3 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a different color to a tip portion of a kensaki, according to the present invention. -
FIG. 4 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a shaft portion provided with a thread ridge to a tip portion of a kensaki, according to the present invention. -
FIG. 5 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a shaft portion of a different size to a tip portion of a kensaki, according to the present invention. -
FIG. 6 is a magnified view illustrating a flow of making a fitting and inserting hole provided on a base end of a kensaki contain a weight member, according to the present invention. -
FIG. 7 is a drawing explaining a difficulty change brought by a change of balance of weight when performing as technique called “Getsumen Chakuriku (landing on the moon)”. -
FIG. 8 is a drawing explaining a difficulty change brought by a change of balance of weight when performing a technique called “Hikoki (air plane)”. -
FIG. 9 is a drawing explaining a difficulty change brought by a change of balance of weight when performing a technique called “Toudai (beacon)”. -
FIG. 10 is a magnified view illustrating a flow of attaching a truncated attachable and detachable member to a tip portion of a kensaki, according to the present invention. -
FIG. 11 is a magnified view illustrating a flow of attaching an attachable and detachable member having slit groove to a tip portion of a kensaki, according to the present invention. -
FIG. 12 is a drawing illustrating a state in which a technique is performed using a kendama attached with the attachable and detachable member having slit groove. -
FIG. 13 is as magnified view illustrating a flow of attaching an attachable and detachable member having string hole to a tip portion of a kensaki, according to the present invention. -
FIG. 14 is a magnified view illustrating a flow of attaching a connecting type attachable and detachable member to a tip portion of a kensaki, according to the present invention. -
FIG. 15 is as drawing illustrating a state in which the connecting type attachable and detachable member is attached to the kensaki to connect each kensaki of two kendamas. -
FIG. 16 is a magnified view illustrating a flow of attaching an attachable and detachable member embedded with camera to a tip portion of a kensaki, according to the present invention. -
FIG. 17 is a front view illustrating a common kendama existing before. -
FIG. 18 is a magnified view illustrating a flow of attaching a standard attachable and detachable member having a fitting and inserting hole provided with a thread groove to a tip portion of a kensaki, according to the present invention. - Embodiments of kendama of a present invention is more specifically explained below with reference to Figures.
- [Outline of an Embodiment of Kendama]
-
FIG. 1 is a front view illustrating a kendama of a present invention in which a standard attachable anddetachable member 112 is attached to akensaki 111. The kendama of the present embodiment is configure by asword 100, aball 200, and astring 300. Thesword 100 is configured by asword shaft 110, and across piece 120. Theball 200 is provided with ahole 210 of inserting akensaki 111 protruding to an upper side than thecross-piece 120 in thesword shaft 110. A tip portion of thekensaki 111 is configured as an attachable anddetachable member 112 which is attachable and detachable with respect to a base end of thekensaki 111. - The kendama of the present embodiment is provided with six kinds as the attachable and
detachable members 112, which are a standard attachable and detachable member 112 (FIG. 2 ), a truncated attachable and detachable member 112 (FIG. 10 ), an attachable anddetachable member 112 having slit groove (FIG. 11 ), an attachable anddetachable member 112 having string hole (FIG. 13 ), a connecting type attachable and detachable member 112 (FIG. 14 ), and an attachable anddetachable member 112 embedded with camera (FIG. 16 ). These six attachable anddetachable members 112 are interchanged each other. These six attachable anddetachable members 112 are specifically explained later. These six attachable anddetachable members 112 are an example. Some of these attachable anddetachable members 112 may be omitted, or an attachable anddetachable member 112 other than the six kinds of attachable anddetachable members 112 may be added to. - Although a
string hole 123 connecting thestring 300 to thesword 100 side is provided on an slight upper side than a center with respect to width and upper and lower direction of thecross piece 120 in as common kendama as illustrated inFIG. 17 , it is provided on a position where a base of thekensaki 111 and thecross-piece 120 connect. By providing thestring hole 123 on upper side than a common kendama, friction given to thestring 300 from the sword is reduced to prevent thestring 300 from breaking. It facilitates one to perform techniques called “Hikoki” and “Toudai” explained later because balance of thesword 100 is improved. Difficulty of techniques can also be changed by shifting leftwardly or rightwardly position of the string hole from the center with respect to width and upper and lower direction of thecross piece 120. - [Standard Attachable and Detachable Member]
- The six kinds of attachable and
detachable members 112 are explained below in sequence. First, the standard attachable anddetachable member 112 is explained. The standard attachable anddetachable member 112 is provided with ahead portion 112 a having a hemispheric shape, and asshaft portion 112 b extending from thehead portion 112 a to a lower side as illustrated inFIG. 2 .FIG. 2 is a magnified view illustrating a flow of attaching the standard attachable anddetachable member 112 to the tip portion of thekensaki 111. InFIG. 2 , thekensaki 111 is illustrated as a cross section cut on a plane on which a center axis lies (FIGS. 3 to 6 , 10, 11, 13, 14, and 16 are illustrated in a same manner). In a common kendama certified by Japanese Kendama Association as a official one, shape of a tip portion of askensaki 111 is hemispheric (or a circular cone). By attaching the standard attachable anddetachable member 112 to thekensaki 111, the tip of thekensaki 111 becomes a hemispheric shape to be used as a common kendama such as one illustrated inFIG. 17 . It is preferable that plurality of the standard attachable and detachable member is provided since it is used very often and tend to be worn. - The
head portion 112 a is exposed outer side after the attachable anddetachable member 112 is attached to thekensaki 111. Although Color of thehead portion 112 a is normally the same as thekensaki 111, it is preferable that various ones having different colors are provided even though attachable anddetachable members 112 belong to the same type, as illustrated inFIG. 3 .FIG. 3 is a magnified view illustrating a flow of attaching a standard attachable anddetachable member 112 having a different color to a tip portion of akensaki 111. By changing a color of thehead portion 112 a, difficulty of techniques can be changed. For example, if an outstanding color such as red is adapted, thehead portion 112 a becomes more outstanding than other portions to facilitate one to successfully perform a technique in which thekensaki 111 is inserted into thehole 210 of theball 200. - Material of the
head portion 112 a is not particularly limited if it has a sufficient strength as the tip portion of thekensaki 111. Plastics, rubbers, metals, woods are exemplified as material of thehead portion 112 a. It is not particularly problematic if material easy to be worn such as woods is used since the kendama of the present embodiment is maintained by interchanging the attachable anddetachable member 112. In the present embodiment, all of thehead portions 112 a of the attachable anddetachable members 112 are made of polyethylene, which is inexpensive and easy to shape. However, if the weight of a tip portion of thekensaki 111 is made adjustable, various ones having different densities are used as for the same type of the attachable anddetachable members 112 too, as in anaforementioned shaft portion 112 b. - The
shaft portion 112 b is explained. The shallportion 112 b is a portion to be fitted and inserted to a fitting and insertinghole 111 a provided on thekensaki 111 to attach the attachable anddetachable member 112 to thekensaki 111. Theshaft portion 112 b is not particularly limited if it has a structure to be fitted and inserted and fixed to the fitting and insertinghole 111 a. For example, the fitting and insertinghole 111 a may be a threaded hole and athread ridge 112 d may be provided on an outer peripheral face of theshaft portion 112 b to screw the attachable anddetachable members 112 to as tip portion of akensaki 111 as illustrated inFIG. 4 .FIG. 4 is a magnified view illustrating a flow of attaching a standard attachable anddetachable member 112 having a shaft portion provided with athread ridge 112 d to at tip portion of it kensaki 111. According to a threadably mounting structure ofFIG. 4 , if a standard attachable and detachable member 122 c having a pattern or a standard attachable and detachable member 122 c having ahead portion 112 a whose shape is different depending on a direction is used, thehead portion 112 a does not come to desired direction when screwing a shallpotion 112 b to a fitting and insertinghole 111 a, unless thread groove of the fitting and insertinghole 111 a and thethread ridge 112 d of theshaft portion 112 b are processed at high accuracy. This is not much problematic if a standard attachable and detachable member having no pattern is used. Considering this, ashaft portion 112 b is made as follows in the kendama of the present embodiment. - The
shaft portion 112 b is provided with a retainingportion 112 c instead of the thread ridge as illustrated inFIG. 2 . The inserting andfitting hole 111 a is not the threaded hole. The retainingportion 112 c is configured by annularly providing an elastic protrusion along an outer peripheral face of theshaft portion 112 b, and closely contacts to an inner peripheral face of the fitting and insertinghole 111 a when theshaft portion 112 b is fitted and inserted into the fitting and insertinghole 111 a to prevent theshaft portion 112 b from being dropped out of the fitting and insertinghole 111 a. The retainingportion 112 c is normally made of elastic materials such as rubbers. If theshaft portion 112 b and the retainingportion 112 c are made of the same material, the retainingportion 112 c and theshaft portion 112 b may be integrally formed at the same time. If they are formed of different materials, the retainingportion 112 c and theshaft portion 112 b are formed as separate body. In this case, the retainingportion 112 c is provided by externally fitting to theshaft portion 112 c or integrally shaping a different material with respect to theshaft portion 112 c. In this case, the retainingportion 112 c is prevented from being dropped out of theshaft portion 112 b by circularly providing a groove on the outer peripheral face of theshaft portion 112 b and positioning the retainingportion 112 c at this portion. - A cross sectional shape perpendicular to a longitudinal direction of the fitting and inserting
hole 111 a and theshaft portion 112 b is a true circle in the kendama of the present embodiment. However, if it is necessary to prevent an attachable anddetachable member 112 from rotating with respect to thekensaki 111 after the attachable anddetachable member 112 is attached to thekensaki 111, the cross sectional shape of the shaft portion, 112 b and the fitting and insertinghole 111 a may be as non-circular shape such as a polygonal shape, an oval shape, or others. According to this configuration, ashaft portion 112 b of an attachable and detachable member attached to as tip portion of akensaki 111 is prevented from rotating by engaging ashaft portion 112 b to an fitting and insertinghole 111 a. This configuration is not adaptable in the threadably mounting structure ofFIG. 4 , and becomes adaptable with ashaft portion 112 b having as fitting and inserting structure as illustrated inFIG. 2 . This configuration is preferably adapted if an attachable anddetachable member 112 should not be rotated such as when using the attachable anddetachable member 112 having slit (FIG. 11 ) or the connecting type attachable anddetachable member 112 which are explained later. - Materials of the
shaft portion 112 b is not particularly limited if it has a sufficient strength. Plastics, rubbers, metals, woods are exemplified as materials of theshaft portion 112 b. Theshaft portion 112 b may be made of a material an as thehead potion 112 b, or may be made of a different material. In the kendama of the present embodiment, as for the standard detachable anddetachable members 112, three kinds are provided, one of which is a light weight type whoseshaft portion 112 b is made of polyethylene another is a middle weight type whoseshaft portion 112 b is made of a plastic of acrylonitrile butadiene styrene (ABS), the other is heavy weight type whoseshaft portion 112 b is made of a plastic of polyoxymethlene (Duracon, registered trademark). Theshaft portion 112 b is made heavier by shaping theshaft portion 112 b with a metal or embedding a heavy material such as metals to an inside of theshaft portion 112 b. Weight of the tip portion of thekensaki 111 can be adjusted by providing various ones havingshaft portions 112 differed in a weight even with the same type attachable anddetachable members 112. - Weight of the tip portion of the
kensaki 111 is also adjusted by providing various ones having a different size such as a length of theshaft portion 112 b even with the same type attachable anddetachable member 112, as illustrated inFIG. 5 .FIG. 5 is as magnified view illustrating a flow of attaching a standard attachable anddetachable member 112 having ashaft portion 112 b of a different size to a tip portion of akensaki 111. Weight of a tip portion of akensaki 111 is also adjusted by containing aweight member 400 in a fitting and insertinghole 111 a as illustrated inFIG. 6 .FIG. 6 is a magnified view illustrating a flow of making a fitting and insertinghole 111 a provided on a base end of akensaki 111 contain aweight member 400. In this case, if theweight member 400 is directly inserted, a trouble possibly occurs such as a rattling sound generated by theweight member 400 vibrating in the fitting and insertinghole 111, or an instability of the balance of weight of thesword 110, it is preferable that a cushioning material 500 (seereference numeral 500 ofFIG. 6 ) is contained at a bottom portion of the fitting and insertinghole 111 a. - The case is explained so far, in which the
shaft portion 112 b of the attachable anddetachable member 112 is fitted and inserted into the fitting and insertinghole 111 a of the tip portion of thekensaki 111. Relationship between theshaft portion 112 b and the fitting and insertinghole 111 a is interchanged. A shallportion 111 b is provided on a tip end plane of the base end of akensaki 111, as illustrated inFIG. 18 . An attainable anddetachable member 112 is provided with a fitting and insertinghole 112 i. By fitting and inserting theshaft portion 111 b to the fitting and insertinghole 112 i, the attachable anddetachable member 112 is attached to thekensaki 111.FIG. 18 is as magnified view illustrating a flow of attaching the standard attachable anddetachable member 112 having a fitting and insertinghole 112 i provided with athread groove 112 j to a tip portion of askensaki 111. In this case, if athread groove 112 j is provided on an inner peripheral face of the fitting and insertinghole 112 i which threadably mounts an outer peripheral face of theshaft portion 111 b, the attachable anddetachable member 112 can be screwed on thekensaki 111. In this case, a threaded shaft is used as theshaft portion 111 b. - As explained above, balance of weight of the
sword 100 is adjusted even with the same type attachable and detachable member 112 (for example with the same standard attachable and detachable member 112) by selecting ahead portion 112 a, materials or size of theshaft potion 112 b, a kind or existence or non-existence of theweight member 400 to change a weight of thekensaki 111. Difficulty of a specific technique is changed by selecting an attachable anddetachable member 112 or as weight member to be used without changing a kendama to be used. Difficulty change of technique brought by change of balance of weight of a sword is explained below raising examples. - For example, there is a technique called “Getsumen Chakuriku (landing on the moon)”, which is included in a hundred chosen techniques by Japan Kendama Association. Getsumen Chakuriku is a technique in which the
ball 200 is held, asword 100 is swung to upside, the sword 10 is put on theball 200 so that a large cup 121 (or a small cup 122) of across-piece 120 contacts to theball 200 as illustrated inFIG. 7 .FIG. 7 is a drawing explaining a difficulty change brought by a change of balance of weight when performing Getsumen Chakuriku. If thekensaki 111 is heavy when performing Getsumen Chakuriku, weight of thesword 100 on theball 200 is balanced at relatively horizontal laid position since a weight center of thesword 100 shifts to thekensaki 111 side, as illustrated in left side ofFIG. 7 . This facilitates one to successfully perform the technique. In contrast to this, if the kensaki is light, weight of thesword 100 on theball 200 is balanced at relatively vertical standing position since a weight center of thesword 100 shifts to a kenjiri (base end of a sword) 114 side, as illustrated in right side ofFIG. 7 . This prevents one from successfully performing the technique. - There is a technique called “Hikoki (air plane)” in the hundred chosen techniques by Japan Kendama Association. Hikoki is a technique in which as
ball 200 is held with ahole 210 facing an upper side, asword 100 is swung up half (or swung plural times) to be inverted by making theball 200 as a center, itskensaki 111 is inserted into thehole 210, as illustrated with arrow A inFIG. 8 .FIG. 8 is a drawing explaining a difficulty change brought by a change of balance of weight when performing a technique called “Hikoki”. If thekensaki 111 is heavy when performing Hikoki, an angular velocity of thesword 100 becomes high when swinging up the sword 100 (rotating rate becomes high) since a weight center of thesword 100 becomes close to a rotation center (the ball 200) of thesword 100. This prevents one from successfully performing the technique. In contrast to this, if the kensaki is light, an angular velocity of thesword 100 becomes low when swinging up the sword 100 (rotating rate becomes low) since a weight center of thesword 100 becomes away from a rotation center (the ball 200) of thesword 100. This facilitates one to successfully perform the technique. - There is a technique called “Toudai (beacon)” the hundred chosen techniques by Japan Kendama Association. Toudai is a technique in which a
ball 200 is held, asword 100 is lifted up, the sword 10 is put on theball 200 so that amiddle cup 116 contacts to theball 200 as illustrated with arrow B inFIG. 9 .FIG. 9 is a drawing explaining as difficulty change brought by a change of balance of weight when performing a technique called “Toudai”. If akensaki 111 is heavy when performing Toudai, a posture of the pulled upsword 100 becomes unstable since a weight center of thesword 100 comes to high position. This prevents one from successfully performing the technique. In contrast to this, if thekensaki 111 is light, a posture of the pulled upsword 100 becomes stable since a weight center of thesword 100 comes to lower position. This facilitates one to successfully perform the technique. - Of course, according to kendama of the present embodiment, difficulty of techniques other than Getsumen Chakuriku, Hikoki, and Toudai can be changed. As explained, according to the kendama of the present embodiment, difficulty of techniques can be changed to enjoy them. The number of steps modifying weight (total weight of an attachable and
detachable member 112 and a weight member 400) of the tip portion of thekensaki 111 is not particularly limited. It is normally two steps or more, and preferably three steps or more, and not more than ten to twenty steps. Adjusting range of a weight of a tip portion (an attachable and detachable member 112) of akensaki 111 is not particularly limited, either. It is normally 1 to 100 g, and is preferably 3 to 50 g, and is more preferably 5 to 20 g. Weight adjusting width (adjusting weight by how much gram) is not particularly limited, either. It is normally by 0.5 g or more, and is preferably 1 g or more, and not more than by 50 to 100 g or so. - [Truncated Attachable and Detachable Member]
- The truncated attachable and
detachable member 112 is explained hereafter.FIG. 10 is a magnified view illustrating a flow of attaching the truncated attachable anddetachable member 112 to the tip portion of thekensaki 111. The truncated attachable anddetachable member 112 configures itshead portion 112 a as a circular truncated cone as illustrated inFIG. 10 . In other words, thehead portion 112 a of the truncated attachable anddetachable member 112 has a shape truncating top portion of thehead portion 112 b (seeFIG. 2 ) of a standard attachable anddetachable member 112. The tip portion of thekensaki 111 becomes a shape of a circular truncated cone by attaching the truncated attachable anddetachable member 112. Novel techniques, which cannot be performed with a common kendama can be performed, such as a technique in which theball 200 is put on the tip portion of thekensaki 111, a technique making the inverted sword stand on the ball 200 (a technique in which a tip portion of akensaki 111 is put on a ball 200), or a technique making the inverted sword stand on a hand or a finger (a technique in which the up portion of thekensaki 111 is put on a hand or a finger). A top portion of the truncated attachable anddetachable member 112 spherically concaves at a radius of curvature same as theball 200 to facilitate to receive theball 200 with the portion, according to the kendama of the present embodiment. Since configurations, which are not specifically referred here such as a structure of ashaft portion 112 b of the truncated attachable anddetachable member 112 and materials consisting each portions, is same as those of the standard attachable anddetachable member 112 explained above, an explanation is omitted. - [Attachable and Detachable Member Having Slit Groove]
- The attachable and
detachable member 112 having slit groove is explained hereafter.FIG. 11 is a magnified view illustrating a flow of attaching the attachable and detachable member having slit groove to the tip portion of the kensaki.FIG. 12 is a drawing illustrating a state in which a technique is performed using a kendama attached with the attachable and detachable member having slit groove. As illustrated inFIG. 11 , in the attachable anddetachable member 112 having slit groove, itshead portion 112 a is provided with aslit groove 112 e. Theslit groove 112 a is provided along an upper face of thehead potion 112 a from a front side to a rear side of thehead portion 112 a. As illustrated inFIG. 12 , theslit groove 112 e makes it possible to catch thestring 300 and to performing novel technique applying this. Since configurations, which are not specifically referred with respect to the attachable anddetachable member 112 having slit groove such as a structure of a shallportion 112 b of the attachable anddetachable member 112 having slit groove and materials consisting each portions, are same as those of the standard attachable anddetachable member 112 explained above, an explanation is omitted. The attachable anddetachable member 112 having slit groove may be combined with the truncated attachable anddetachable member 112 to make a hybrid type. - [Attachable and Detachable Member Having String Hole]
- The attachable and
detachable member 112 having string hole is explained hereafter.FIG. 13 is a magnified view illustrating a flow of attaching the attachable anddetachable member 112 having string hole to the tip portion of thekensaki 111. As illustrated inFIG. 13 , the attachable anddetachable member 112 is provided with astring hole 112 f perforating ahead portion 112 a from one side to other side. As illustrated in as drawing on right side, thestring 300 is connected to make a loop. By fixing an end portion of thestring 300 on thesword 100 side to thestring hole 112 f provided on thekensaki 111, kendama is enjoyed in a feeling different from a common kendama (FIG. 17 ) in which an end portion of astring 300 on a sword side is fixed to thecross-piece 120. According to this, novel techniques can be performed with the kendama. Since other configurations, which are not specifically referred with respect to the attachable anddetachable member 112 having string hole such as a structure of ashaft portion 112 b of the attachable anddetachable member 112 having string hole and materials consisting each portions, are same as those of the standard attachable anddetachable member 112 explained above, an explanation is omitted. The attachable anddetachable member 112 having string hole may be combined with the truncated attachable anddetachable member 112 or the attachable anddetachable member 122 having slit groove to make a hybrid type. - [Connecting Type Attachable and Detachable Member]
- The connecting type attachable and
detachable member 112 is explained hereafter.FIG. 14 is a magnified view illustrating a flow of attaching the connecting type attachable anddetachable member 112 to the tip portion of thekensaki 111.FIG. 15 is a drawing illustrating a state in which the connecting type attachable anddetachable member 112 is attached to thekensaki 111 to connect eachkensaki 111 of two kendamas. In as portion where thekensaki 111 and its vicinity are illustrated as magnified manner inFIG. 15 , thekensaki 111 is illustrated as a cross section cut on a plane on which a center axis lies. The connecting type attachable anddetachable member 112 has a configuration of ashaft portion 112 b being extended until a portion corresponding to thehead portion 112 a of the standard attachable anddetachable member 112, an upper half of theshaft portion 112 b projecting out of a fitting and insertinghole 111 a when theshaft portion 112 b being fitted and inserted into the fitting and insertinghole 111 a, as illustrated inFIG. 14 . The tip portion of thekensaki 111 of one kendama can be connected to a tip portion of akensaki 111 of another kendama. According to this, novel techniques, which cannot be performed with a common kendama, can be performed. Since other configurations, which are not specifically referred with respect to the connecting type attachable anddetachable member 112 such as a structure of ashaft portion 112 b of the connecting type attachable anddetachable member 112 and materials consisting each portions, are same as those of the standard attachable anddetachable member 112 explained above, an explanation is omitted. - [Attachable and Detachable Member Embedded with Camera]
- Finally, the attachable and
detachable member 112 embedded with camera is explained.FIG. 16 is a magnified view illustrating a flow of attaching the attachable anddetachable member 112 embedded with camera to a tip portion of askensaki 111. As illustrated inFIG. 16 , in the attachable anddetachable member 112 embedded with a camera, itshead portion 112 a is embedded with asmall camera 112 g to take a movie at an eye point of as top portion of thehead portion 112 a. This makes it possible to take a movie of a technique of kendama at a novel eye point not existing before. Acable 112 h, which supply a power to thesmall camera 112 g or outputting data of a movie taken with thesmall camera 112 g, is extending from a lower end portion of thesmall camera 112 g. Thecable 112 h goes through ashaft portion 112 b of the attachable anddetachable member 112 to be contained in a fitting and insertinghole 111 a. A power source supplying thesmall camera 112 g (not illustrated in Figs.) with a power and a memory (not illustrated in Figs.) storing data of movies taken with thesmall camera 112 g can be contained in a cavity portion of asword shaft 110 or as across-piece 120. Since other configurations, which are not specifically referred with respect to the attachable anddetachable member 112 embedded with camera such as a structure of ashaft portion 112 b of the attachable anddetachable member 112 embedded with camera and materials consisting each portions, are same as those of the standard attachable anddetachable member 112 explained above, an explanation is omitted. The attachable anddetachable member 112 embedded with camera may be combined with the truncated attachable anddetachable member 112, the attachable anddetachable member 112 having a slit groove, or the attachable anddetachable member 112 having string hole to make a hybrid type. -
- 100 sword
- 110 sword shaft
- 111 kensaki
- 111 a fitting and inserting hole
- 111 b shaft portion
- 112 attachable and detachable member
- 112 a head portion
- 112 b shaft portion
- 112 c retaining portion
- 112 d thread ridge
- 112 e slit groove
- 112 f string hole
- 112 g small camera
- 112 h cable
- 112 i fitting and inserting hole
- 112 j thread groove
- 114 kenjiri
- 115 slip-stop
- 116 middle cup
- 116 a middle cup rim
- 120 cross-piece
- 121 large cup
- 121 a large cup rim
- 122 small cup
- 122 a small cup rim
- 123 string hole
- 200 ball
- 210 hole
- 300 string
- 400 weight member
- 500 cushioning material
Claims (14)
1. A kendama comprising:
a sword having a sword shaft and a cross-piece;
a ball having a hole of inserting a kensaki protruding to an upper side than the cross-piece in the sword shaft; and
a string connecting the sword and the ball, wherein
a tip portion of the kensaki is configured as an attachable and detachable member which is attachable and detachable with respect to a base end of the kensaki, the attachable and detachable member is a plurality of attachable and detachable members replaced each other.
2. The kendama according to claim 1 , wherein at least two attachable and detachable members out of the plurality of attachable and detachable members differ in at least any one item or more items out of a weight, shape, and color.
3. The kendama according to claim 1 , wherein at least one attachable and detachable member is of configuring a shape of the tip portion of the kensaki as a hemisphere or circular cone.
4. The kendama according to claim 1 , wherein at least one attachable and detachable member is of configuring a shape of the tip portion of the kensaki as a circular truncated cone.
5. The kendama according to claim 1 , wherein at least one attachable and detachable member is of providing a slit groove catching the string with the tip portion of the kensaki.
6. The kendama according to claim 1 , wherein at least one attachable and detachable member is of providing a string hole connecting the string to the tip portion of the kensaki.
7. The kendama according to claim 1 , wherein at least one attachable and detachable member is of connecting a kensaki of another kendama to the tip portion of the kensaki.
8. The kendama according to claim 1 , wherein at least one attachable and detachable member is of attaching a small camera to the tip portion of the kensaki.
9. The kendama according to claim 1 , wherein a fitting and inserting hole is provided on a tip end plane of the base end of the kensaki, the attachable and detachable member has a shaft portion to be inserted and fitted to the fitting and inserting hole.
10. The kendama according to claim 9 , wherein a retaining portion is provided on the shaft portion, the retaining portion is configured by annularly providing an elastic protrusion along an outer peripheral face of the shaft portion.
11. The kendama according to claim 1 , wherein a shaft portion is provided on a tip end plane of the base end of the kensaki, the attachable and detachable member is provided with as fitting and inserting hole to insert and it the shaft portion.
12. The kendama according to claim 11 , wherein a thread groove is provided on an inner peripheral face of the fitting and inserting hole of the attachable and detachable member, the thread groove threadably mounts an outer peripheral face of the shaft portion on the base end of the kensaki.
13. The kendama according to claim 9 , a weight member is contained in the fitting and inserting hole to adjust a weight of the kensaki.
14. The kendama according to claim 11 , a weight member is contained in the fitting and inserting hole to adjust a weight of the kensaki.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013013533 | 2013-01-28 | ||
JP2013-013533 | 2013-01-28 | ||
PCT/JP2013/074311 WO2014115366A1 (en) | 2013-01-28 | 2013-09-10 | Kendama |
Publications (1)
Publication Number | Publication Date |
---|---|
US20150314181A1 true US20150314181A1 (en) | 2015-11-05 |
Family
ID=51227174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/408,162 Abandoned US20150314181A1 (en) | 2013-01-28 | 2013-09-10 | Kendama |
Country Status (6)
Country | Link |
---|---|
US (1) | US20150314181A1 (en) |
EP (1) | EP2853297A4 (en) |
JP (1) | JP6557471B2 (en) |
CN (1) | CN104619383A (en) |
HK (1) | HK1209676A1 (en) |
WO (1) | WO2014115366A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD754259S1 (en) * | 2015-02-02 | 2016-04-19 | Benjamin James Mcphee | Kendama toy |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103933741A (en) * | 2014-04-15 | 2014-07-23 | 王鸿雁 | Combined sword ball |
JP6516326B2 (en) * | 2015-04-23 | 2019-05-22 | 株式会社バンダイ | Kendama toy |
JP6426124B2 (en) * | 2016-07-06 | 2018-11-21 | 公益社団法人日本けん玉協会 | Kendama |
WO2019111162A1 (en) * | 2017-12-06 | 2019-06-13 | Board & Batten International Inc. | A position or score indicator for a game |
CN109011637A (en) * | 2018-06-06 | 2018-12-18 | 上海暴谷智能科技有限公司 | A kind of removable alternate form sword ball |
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- 2013-09-10 EP EP13872964.5A patent/EP2853297A4/en not_active Withdrawn
- 2013-09-10 US US14/408,162 patent/US20150314181A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
HK1209676A1 (en) | 2016-04-08 |
WO2014115366A1 (en) | 2014-07-31 |
JPWO2014115366A1 (en) | 2017-01-26 |
CN104619383A (en) | 2015-05-13 |
EP2853297A4 (en) | 2016-02-24 |
JP6557471B2 (en) | 2019-08-07 |
WO2014115366A8 (en) | 2015-03-12 |
EP2853297A1 (en) | 2015-04-01 |
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Owner name: IWATA CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IWATA, KAZUMA;REEL/FRAME:034508/0817 Effective date: 20141126 |
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STCB | Information on status: application discontinuation |
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