Kendama
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.
The present invention relates to a kendama.
BACKGROUND ARTKendama 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.
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 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. 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.
PRIOR ARTS Patent DocumentPatent 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
DISCLOSURE OF THE INVENTION Problem to be Solved by the InventionPresent 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 112b of
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 of
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.
Embodiments of kendama of a present invention is more specifically explained below with reference to Figures.
[Outline of an Embodiment of Kendama]
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 (
Although 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
[Standard Attachable and Detachable Member]
The six kinds of attachable and detachable members 112 are explained below in sequence. First, the standard attachable and detachable member 112 is explained. The standard attachable and detachable member 112 is provided with a head portion 112a having a hemispheric shape, and as shaft portion 112b extending from the head portion 112a to a lower side as illustrated in
The head portion 112a is exposed outer side after the attachable and detachable member 112 is attached to the kensaki 111. Although Color of the head portion 112a 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
Material of the head portion 112a 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 112a. 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. In the present embodiment, all of the head portions 112a of the attachable and detachable members 112 are made of polyethylene, which is inexpensive and easy to shape. However, if the weight of a tip portion of the kensaki 111 is made adjustable, various ones having different densities are used as for the same type of the attachable and detachable members 112 too, as in an aforementioned shaft portion 112b.
The shaft portion 112b is explained. The shall portion 112b is a portion to be fitted and inserted to a fitting and inserting hole 111a provided on the kensaki 111 to attach the attachable and detachable member 112 to the kensaki 111. The shaft portion 112b is not particularly limited if it has a structure to be fitted and inserted and fixed to the fitting and inserting hole 111a. For example, the fitting and inserting hole 111a may be a threaded hole and a thread ridge 112d may be provided on an outer peripheral face of the shaft portion 112b to screw the attachable and detachable members 112 to as tip portion of a kensaki 111 as illustrated in
The shaft portion 112b is provided with a retaining portion 112c instead of the thread ridge as illustrated in
A cross sectional shape perpendicular to a longitudinal direction of the fitting and inserting hole 111a and the shaft portion 112b is a true circle in the kendama of the present embodiment. However, if it is necessary to prevent an attachable and detachable member 112 from rotating with respect to the kensaki 111 after the attachable and detachable member 112 is attached to the kensaki 111, the cross sectional shape of the shaft portion, 112b and the fitting and inserting hole 111a may be as non-circular shape such as a polygonal shape, an oval shape, or others. According to this configuration, a shaft portion 112b of an attachable and detachable member attached to as tip portion of a kensaki 111 is prevented from rotating by engaging a shaft portion 112b to an fitting and inserting hole 111a. This configuration is not adaptable in the threadably mounting structure of
Materials of the shaft portion 112b is not particularly limited if it has a sufficient strength. Plastics, rubbers, metals, woods are exemplified as materials of the shaft portion 112b. The shaft portion 112b may be made of a material an as the head potion 112b, or may be made of a different material. In the kendama of the present embodiment, as for the standard detachable and detachable members 112, three kinds are provided, one of which is a light weight type whose shaft portion 112b is made of polyethylene another is a middle weight type whose shaft portion 112b is made of a plastic of acrylonitrile butadiene styrene (ABS), the other is heavy weight type whose shaft portion 112b is made of a plastic of polyoxymethlene (Duracon, registered trademark). The shaft portion 112b is made heavier by shaping the shaft portion 112b with a metal or embedding a heavy material such as metals to an inside of the shaft portion 112b. 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 112b even with the same type attachable and detachable member 112, as illustrated in
The case is explained so far, in which the shaft portion 112b of the attachable and detachable member 112 is fitted and inserted into the fitting and inserting hole 111a of the tip portion of the kensaki 111. Relationship between the shaft portion 112b and the fitting and inserting hole 111a is interchanged. A shall portion 111b is provided on a tip end plane of the base end of a kensaki 111, as illustrated in
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 a head portion 112a, materials or size of the shaft potion 112b, 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.
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, 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
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 a hole 210 facing an upper side, 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
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, 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
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 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. 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.
[Attachable and Detachable Member Having Slit Groove]
The attachable and detachable member 112 having slit groove is explained hereafter.
[Attachable and Detachable Member Having String Hole]
The attachable and detachable member 112 having string hole is explained hereafter.
[Connecting Type Attachable and Detachable Member]
The connecting type attachable and detachable member 112 is explained hereafter.
[Attachable and Detachable Member Embedded with Camera]
Finally, the attachable and detachable member 112 embedded with camera is explained.
- 100 sword
- 110 sword shaft
- 111 kensaki
- 111a fitting and inserting hole
- 111b shaft portion
- 112 attachable and detachable member
- 112a head portion
- 112b shaft portion
- 112c retaining portion
- 112d thread ridge
- 112e slit groove
- 112f string hole
- 112g small camera
- 112h cable
- 112i fitting and inserting hole
- 112j thread groove
- 114 kenjiri
- 115 slip-stop
- 116 middle cup
- 116a middle cup rim
- 120 cross-piece
- 121 large cup
- 121a large cup rim
- 122 small cup
- 122a small cup rim
- 123 string hole
- 200 ball
- 210 hole
- 300 string
- 400 weight member
- 500 cushioning material
Claims
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.
Type: Application
Filed: Sep 10, 2013
Publication Date: Nov 5, 2015
Inventor: Kazuma Iwata (Hatsukaichi-shi, Hiroshima)
Application Number: 14/408,162