JP2018187245A - racket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize ball-hitting feeling and ball-hitting performance, and satisfactorily keep the exterior appearance of the string stretched.SOLUTION: A racket (10) is configured by including a frame (20) where a ball-hitting surface is formed by stretching string (21) in the vertical/horizontal direction. Multiple insertion paths (33) for inserting the string are formed in the frame. The insertion paths for inserting the string at lateral both sides are formed in the asymmetry position assuming the longitudinal direction as the symmetry axis position, and an inclination angle to the lateral direction of the string stretched between the insertion paths is formed so as to be 0° or more and 0.2° or less. Also, the insertion paths fo insert the string at longitudinal both sides are formed in the asymmetry position assuming the lateral direction as the symmetry axis position, and the inclination angle to the longitudinal direction of the string stretched between the insertion paths is formed so as to be 0° or more and 0.2° or less.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a racket in which a ball striking surface is formed by a string stretched vertically and horizontally in a frame.

  In tennis and badminton rackets, strings made of warps and wefts are stretched in a lattice pattern on a loop-shaped frame to form a striking surface. A number of insertion holes through which the strings are inserted are formed at predetermined intervals in the frame, and the strings are stretched through these insertion holes (see Patent Document 1).

  In the racket frame, the insertion holes for inserting the strings serving as the weft are arranged symmetrically, and the insertion holes for inserting the strings serving the warp are arranged symmetrically. Further, in order to facilitate passing the string through the insertion hole, the inner diameter dimension of the insertion hole is formed larger than the outer diameter dimension of the string. When the string is stretched over the frame, the string that passes through the insertion hole from the inside of the frame to the outside of the frame is folded at the insertion hole and passed through the next insertion hole, and this is repeated. Become. Therefore, for example, the string that becomes the weft extends in the up-and-down direction so as to meander by being inserted and folded through the plurality of insertion passages.

JP 2005-237877 A

  In the racket, there is a problem that the string is in an angularly displaced state without being parallel to the vertical and horizontal directions. The reason for this is that when wefts are described, although the vertical positions of the insertion holes on the left and right sides of the wefts are the same, the tensioning direction meanders as described above, and the inner diameter of the insertion holes is larger than the outer diameter of the string. This is because the return position of the string is greatly shifted in the vertical direction at the left and right insertion holes. In addition, the warp yarn also shifts in the same manner as the positional relationship with the weft yarn changes by 90 °. For this reason, in the stretched string, the lattice formed by the weft and the warp is not square, so that the appearance is lost, and the feeling of hitting and the hitting performance at the time of play are lacking in stability.

  The present invention has been made in view of the above circumstances, and provides a racket that can stabilize the feel of hitting and hitting performance, and can maintain the appearance of the stretched string in good condition. The purpose is to provide.

The racket of the present invention is a racket provided with a frame in which strings are stretched in the vertical and horizontal directions to form a ball striking surface, and the frame has a plurality of insertion passages through which the string is inserted. ) And (2) are employed.
(1) The insertion path through which the string is inserted on both sides in the horizontal direction is formed at an asymmetric position with the vertical direction as the symmetric axis position, and the inclination angle of the string stretched between the insertion paths with respect to the horizontal direction is 0 The angle is not less than 0.2 ° and not more than 0.2 °.
(2) The insertion path through which the string is inserted on both sides in the vertical direction is formed at an asymmetrical position with the horizontal direction as the symmetrical axis position, and the inclination angle of the string stretched between the insertion paths with respect to the vertical direction is 0 The angle is not less than 0.2 ° and not more than 0.2 °.

  According to this configuration, the insertion paths on both sides of the string in the horizontal direction and / or both sides in the vertical direction are asymmetrical positions, and the inclination angle with respect to the vertical and horizontal directions of the string is set as described above. Strings can be stretched substantially in parallel. Thereby, the crossing angle between the weft and the warp of the string is a right angle or a substantially right angle, and the string can be stretched in a lattice shape excellent in appearance. In addition, it is possible to make the contact state between the ball or shuttle and the string uniform at the time of hitting, and to stabilize the hitting performance such as the stability of the hitting feeling to the player and the controllability. In addition, this invention is not restricted to what is formed in said position about all the insertion paths, It does not prevent forming in a position different from said position about some insertion paths.

  In the racket of the present invention, it is preferable that an insertion passage through which a string forming a central region of the hitting surface is inserted in the asymmetric position among the strings stretched in the horizontal direction or the vertical direction. According to this configuration, the string of sweet spots, which are the central region of the ball striking surface, can be stretched in a lattice shape with the crossing angle approaching a right angle. Thereby, it is possible to improve the appearance of the conspicuous area on the hitting surface, and to stabilize the hitting feeling and hitting performance at the sweet spot that is an ideal hitting position.

  Further, in the racket of the present invention, the insertion passage through which the string is inserted on both sides in the lateral direction is a position where the string to be stretched is folded, and the folded position is shifted in the vertical direction by the approximate diameter of the string. It is good to be formed. Further, in the racket of the present invention, the insertion path through which the string is inserted on both sides in the longitudinal direction is a position where the string to be stretched is folded back, and the folded position is shifted in the lateral direction by the approximate diameter of the string. It is good to be formed. According to this configuration, the string can be stretched parallel to the vertical and horizontal directions by a design that takes into consideration the diameter of the string and the return position of the string in the insertion hole.

  Moreover, the racket of this invention WHEREIN: The said insertion path is good to be formed by the cylinder part which penetrates the hole formed in the said flame | frame. According to this configuration, the above-described function can be exhibited in a frame on which a grommet or the like having a cylindrical portion is mounted. In addition, the insertion hole having the above positional relationship can be formed by a grommet that is a separate member from the frame, facilitating manufacture.

  Moreover, the racket of this invention WHEREIN: The said cylinder part is good to insert the said string in contact with an internal peripheral surface over the substantially full length. According to this configuration, it is possible to increase the vibration damping effect of the string by increasing the contact area between the string and the cylindrical portion.

  According to the present invention, it is possible to stabilize the hit feeling and hitting performance, and it is possible to keep the appearance of the stretched string in good condition.

FIG. 1A is an external view of a racket according to an embodiment, FIG. 1A is a front view of the racket, and FIG. 1B is a side view of the racket. It is explanatory drawing regarding stringing of the frame center area | region. It is explanatory drawing which represented typically the tension | tensile_strength state of the string in embodiment. It is explanatory drawing which represented the state which made the string raising direction different similarly to FIG. It is a partial expanded side view of a grommet. It is explanatory drawing which represented the tension | tensile_strength state of the string in a conventional structure similarly to FIG.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the following, an example in which the grommet according to the present invention is applied to a racket for hard tennis will be described, but the application target can be changed without being limited thereto. For example, the present invention may be applied to a tennis racket for soft tennis, a racket for squash, a racket for badminton, or the like.

  FIG. 1 is an external view of a racket according to an embodiment of the present invention, FIG. 1A is a front view of the racket, and FIG. 1B is a side view of the racket. In the following drawings, a part of the configuration is omitted for convenience of explanation.

  As shown in FIG. 1, the racket 10 includes a head 11 that is a part for hitting a ball, a grip 12 that is a part for a player to hold the racket 10, and a shaft 13 that integrally connects the head 11 and the grip 12. I have. In the following description, as indicated by an arrow in FIG. 1, the longitudinal direction of the racket 10 is the vertical direction (or the vertical direction), and the side where the head 11 is located in the vertical direction is the upper end side, and the grip The side where 12 is located is the lower end side. Further, on the ball striking surface of the racket 10 (that is, on the plane along the ball striking surface), the direction orthogonal to the vertical direction is defined as the horizontal direction (or the left-right direction), and the direction orthogonal to the ball striking surface of the racket 10 is the thickness direction ( Or, the front-rear direction).

  The shaft 13 includes a throat 15 that bifurcates from the grip 12 toward the head 11 when viewed from the front-rear direction, and a yoke 17 that forms a part of the head 11 is formed between the left and right throats 15. . The shaft 13 is not limited to this, and may not be branched into two.

  The head 11 includes an elliptical frame 20 that is long in the vertical direction and a string 21 that is stretched in the vertical and horizontal directions inside the frame 20, and forms a ball striking face (face) inside the frame 20. The frame 20 is formed by forming a hollow cylindrical body made of, for example, a fiber reinforced resin into an elliptical shape. The frame 20 may not be hollow but may be filled with a foam material, made of wood or metal.

  The outer peripheral surface 20a of the frame 20 is provided with a groove 20b in which a central portion in the thickness direction is recessed as compared with both side portions. The groove portion 20 b is provided continuously along the circumferential direction of the frame 20. Further, the frame 20 is provided with a through hole (hole) 23, and the through hole 23 is formed to penetrate from the bottom side of the groove 20 b of the frame 20 to the inner peripheral surface 20 c. A plurality of through holes 23 are provided along the circumferential direction of the frame 20.

  Four grommets 25 to 28 are attached to the frame 20 from the outer peripheral side, and the string 21 is stretched on the frame 20 through the grommets 25 to 28. In the present embodiment, the front-side grommet 25 is provided from a location in the direction of about 10 o'clock to a location in the direction of about 2 o'clock in the front view of the frame 20 in FIG. Protect. The left and right grommets 26 and 27 are provided from the vicinity of both left and right ends of the front end side grommet 25 to a position reaching the lowest through hole 23 formed on the left and right side surfaces of the frame 20. The rear end side grommet 28 is provided on the yoke 17. In addition, each grommet 25-27 except the back end side grommet 28 may change the length along the circumferential direction of the flame | frame 20 according to various conditions.

  Here, each of the grommets 26 to 28 includes a belt-like portion 31 that extends in the circumferential direction of the frame 20 and a plurality of cylindrical portions 32 that protrude from the back surface that is one surface of the belt-like portion 31. The front-rear width of the belt-like part 31 is set to be larger than the front-rear width of the groove part 20 b and smaller than the front-rear width of the frame 20. In the grommet 25 on the front end side, the front-rear width of the belt-like portion 31 is formed substantially the same as the front-rear width of the frame 20 to protect the top 20A side of the frame 20.

  The cylindrical part 32 has a base part on the side of the belt-like part 31, and a tip part on the opposite side of the base part penetrates the through hole 23 from the outside of the frame 20. Grommets 25 to 28 are attached to the frame 20 by this penetration, and in this state, the distal end side of the cylindrical portion 32 is disposed so as to protrude inward from the inner peripheral surface 20 c side of the frame 20. Here, the internal space of each cylindrical portion 32 is formed as an insertion passage 33 (see FIG. 3) through which the string 21 is inserted. Since each cylindrical part 32 is inserted and attached to the plurality of through holes 23 of the frame 20, a plurality of insertion passages 33 are formed in the frame 20. The inner diameter dimension of the insertion passage 33 is larger than the diameter dimension of the string 21 for convenience of passing the string 21.

  Next, a procedure for extending the string 21 according to the present embodiment will be described. Here, a description will be given of a tensioning procedure for the string 21 that extends in the lateral direction at the sweet spot that is the central region of the frame 20, that is, the string 21 that is the weft yarn in the central region S. FIG. 2 is an explanatory diagram relating to string stringing in the center area of the frame.

  As shown in FIG. 2, when a string 21 serving as a weft is stretched on the frame 20, for example, when viewed from the position and direction of the arrow a <b> 1, the string 21 is inserted from the distal end side of the cylindrical portion 32 to the base side. Then, the string 21 is folded back at the base portion of the cylindrical portion 32, and the position and direction of the arrow a <b> 2 are formed along the surface of the band-shaped portion 31 outside the frame 20. Subsequently, the string 21 is folded back at the base portion of the cylindrical portion 32 adjacent to the lower side, and is inserted from the base side of the cylindrical portion 32 to the distal end side to become the position and direction of the arrow a3. Extended.

  Such a procedure is performed alternately on the right and left sides of the frame 20 in one string 21 forming a weft. Thereby, the string 21 used as the weft extends in the vertical direction while meandering by repeatedly inserting and turning back through the insertion passages 33 (see FIG. 4) in the plurality of cylindrical portions 32. The extending direction of the string 21 indicated by the arrows in FIG. 2 including the directions of the arrows a1 to a3 at this time is the extending direction of the strings 21.

  Next, the formation position of the insertion path of this Embodiment is demonstrated below with reference to FIG. 3 thru | or FIG. First, the insertion path for stretching the string 21 serving as the weft in the central region S (see FIG. 2) will be described. FIG. 3 is an explanatory view schematically showing a string tension state in the embodiment.

  As shown in FIG. 3, in the present embodiment, the insertion passage 33 (tubular portion 32) that passes through both the left and right sides of the string 21 serving as the weft is formed at an asymmetric position with the longitudinal direction as the symmetric axis position. For example, in the weft thread (string 21) located at the second position from the top in FIG. 3, the right insertion path 33 is shifted downward in the longitudinal direction with respect to the left insertion path 33. When the string 21 is stretched in the above-described lifting direction with respect to the frame 20, among the left and right insertion paths 33 through which one weft thread (string 21) is inserted, the upper side of the one insertion path 33 is the folded position (for example, (The position indicated by reference numeral F1 in FIG. 3). On the other hand, in the other insertion passage 33, the lower side is the folding position of the string 21 (for example, the position indicated by the symbol F2 in FIG. 3). The folding positions F1 and F2 are formed at positions shifted in the vertical direction, and the shift amount G1 is set to be substantially the same as the diameter dimension D of the string 21. For this reason, the string 21 serving as the weft is stretched in parallel or substantially parallel to the lateral direction, and specifically, the inclination angle of the string 21 with respect to the lateral direction is in the range of 0 ° to 0.2 °. It is stretched. Here, the fact that the deviation G1 and the diameter dimension D are substantially the same means not only the case where they are the same, but also the case where the inclination angle is deviated within the above range.

  In the insertion passage 33 through which the string 21 serving as the weft is inserted, the folding position of the string 21 is shifted in the vertical direction as described above, and therefore the pitch in the vertical direction is not uniform. Here, a pitch at a portion along which the string 21 extends along the belt-like portion 31 is defined as a first pitch P1, and a pitch at a portion not along the string 21 is defined as a second pitch P2. The first pitch P1 and the second pitch P2 are alternately positioned in the vertical direction. For example, when the pitch of the strings 21 is the same in the central area S of the ball striking surface 12, the first pitch P1 is formed larger than the second pitch P2. The plurality of first pitches P1 are the same or approximate values, and the plurality of second pitches P2 are the same or approximate values. The approximate value differs depending on the vertical position of the frame 20, but is a value in the range of 94% to 106% with respect to the center value, for example.

  FIG. 4 is an explanatory view showing a state in which the string extending direction is made different as in FIG. FIG. 5 is a partially enlarged side view of the grommet. When the lifting direction is changed symmetrically with respect to the insertion passage 33 positioned as described above, and the folding direction shown in FIG. 4 is changed, the folding position in the insertion passage 33 also changes. It will be greatly inclined. Therefore, as shown in FIG. 5, in the band-like portion 31, a groove 31a is formed in a region along the surface of the string 21, and a region not along the string 21 is a non-formed region 31b where no groove is formed. As a result, if the uplift direction is inadvertently mistaken as shown in FIG. 4, the string 21 is not received in the groove 31a, and the string 21 extends along the strip portion 31 so as to protrude from the non-forming region 31b. . If it becomes like this, an operator will be able to recognize now easily during the tension | tensile_strength operation | work of the string 21, and it can avoid that the string 21 which becomes a weft is inclined with respect to a horizontal direction.

  Here, for comparison with the present embodiment, the formation position of the insertion path and the string tension state in the conventional structure will be described. FIG. 6 is an explanatory view showing the string tension state in the conventional structure in the same manner as FIG.

  In the conventional structure of FIG. 6, the insertion passage 133 (tubular portion 132) that passes through both the left and right sides of the string 121 serving as the weft is in a symmetric position, that is, a position that is symmetric with respect to the vertical direction. Is formed. Accordingly, the left and right insertion paths 133 have the same position in the vertical direction (vertical direction). When the string 121 is stretched in the above-described extending direction in the insertion passage 133 positioned in this way, the upper side of one of the insertion passages 133 in the left and right insertion passages 133 is the folding position F1, and the other insertion passage 133 is disposed. Then, the lower side is the folding position F2 of the string 121. Also in the conventional structure, the folding position of the string 121 is shifted in the vertical direction in the left and right insertion paths 133. However, the shift amount G0 between the folding positions F1 and F2 in the vertical direction in the left and right insertion paths 133 is larger than the diameter D of the string 121. As a result, in the conventional structure, the string 121 serving as the weft is not parallel to the lateral direction but extends in an inclined state.

  Thus, in contrast to the conventional structure, in the present embodiment, it is possible to prevent the string 21 that becomes the weft in the frame 20 from approaching or parallel to the lateral direction and being inclined. Thereby, about the square of the grid | lattice formed crossing with the string 21 used as the warp, the corner can be made to make a right angle or a right angle, and the external appearance can be made favorable. Furthermore, by stretching the string 21 in this way, the contact state between the ball and the string 21 at the time of hitting can be made uniform and good. As a result, it is possible to stably maintain a comfortable shot feeling for the player and to stabilize the hitting performance such as resilience and controllability.

  Moreover, in this Embodiment, the cylinder part 32 and the insertion path 33 are extended in the horizontal direction, and the string 21 used as a weft is parallel to the horizontal direction, whereby the insertion path 33 serving as the inner peripheral surface of the cylinder part 33 is formed. The string 21 is inserted in contact with the entire length. That is, the insertion path 33 and the string 21 can be brought into contact with each other with a line contact or a width slightly wider than the line contact. On the other hand, in the conventional structure of FIG. 6, in the insertion passage 133, only a part on the base side that is the folding position in the full length direction is inserted so as to make point contact with the string 121. Therefore, according to the present embodiment, a wider contact area between the insertion path 33 and the string 21 can be secured, and the vibration damping effect of the string 21 by the cylindrical portion 32 can be better obtained.

  In the above description, the string 21 in the central region S and the insertion passage 33 through which the string 21 is inserted have been described. However, the upper and lower strings 21 and the insertion passage 33 of the central region S may be configured similarly. Good. For example, with respect to the string 21 serving as the weft that forms the upper side and the lower side of the center region S on the ball striking surface in the frame 20, the insertion passage 33 that passes through the string 21 on both sides in the lateral direction may be formed similarly. . In this case, if the cylindrical portion 32 and the insertion passage 33 extend in parallel with the lateral direction, the string 21 can be folded back as in the above embodiment. On the other hand, when the cylindrical portion 32 and the insertion passage 33 extend in a direction inclined at a predetermined angle with respect to the lateral direction, the distal end side of the cylindrical portion 32 can be a folding position of the string 21.

  For the string 21 serving as the weft, the region parallel to the lateral direction as described above may or may not include the central region S. However, since the central area S forms a sweet spot, it has a great influence on the feel at impact and performance, and since the central area S is particularly conspicuous in appearance, it is included as an area parallel to the horizontal direction. It is better not to.

  Although the string 21 serving as the weft and the insertion passage 33 through which the string 21 is inserted are illustrated and described, the direction of the string 21 serving as the warp and the insertion path 33 through which the string 21 is inserted at both the upper and lower sides is also changed from 90 to 90 in the vertical direction. ° Similar configuration can be adopted just by changing. Although not shown, only the main points will be described below.

  The insertion passages 33 (tubular portions 32) on both the upper and lower sides through which the string 21 is inserted on both sides in the vertical direction are formed at asymmetric positions with the horizontal direction as the symmetric axis position, and the vertical direction of the string 21 stretched between the insertion passages 33 The inclination angle with respect to the direction is set to 0 ° or more and 0.2 ° or less. In order to form the insertion passage 33 in this way, it is preferable to include the insertion passage 33 through which the string 21 forming the sweet spot that becomes the left and right central region of the frame 20 is included in the string 21 that becomes the warp. Note that this does not prevent the insertion passage 33 from being included.

  In addition, the string 21 to be stretched is folded back in the upper and lower insertion passages 33 through which one warp thread (string 21) is inserted, and the folding position is shifted to the lateral direction by the approximate diameter of the string 21. Is formed. In this way, the string 21 serving as the warp can be stretched parallel or substantially parallel to the longitudinal direction.

  The above-described configuration is preferably employed for both the insertion passage 33 through which the weft thread is inserted and the insertion passage 33 through which the warp thread is inserted, but may be employed for any one of them.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, direction, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  For example, in the cylinder part 32, the axial center position and the axial center position of the insertion path 33 may be made to correspond, and the insertion path 33 may be formed so that it may decenter as a mismatch. In the eccentric insertion passage 33, even if the positions of the cylindrical portion 32 and the through hole 23 are the same as those in the conventional structure, the return position of the string 21 in the insertion passage 33 can be changed. Accordingly, by preparing the grommets 25 to 28 in which the positions of the insertion passages 33 are changed with respect to the racket having the conventional structure, the string 21 can be made parallel to the vertical and horizontal directions as in the above embodiment. it can.

  The present invention is a racket in which strings are stretched so as to be parallel in the vertical and horizontal directions, and can stabilize the feel of hitting ball and hitting performance and keep the appearance of the stretched strings in good condition. Has the effect of being able to.

10 rackets 20 frames 21 strings 23 through holes (holes)
32 Tube 33 Insertion path

Claims (9)

A racket including a frame in which strings are stretched in the vertical and horizontal directions to form a hitting surface,
The frame has a plurality of insertion passages through which the string is inserted,
The insertion passage through which the string is inserted on both sides in the horizontal direction is formed at an asymmetric position with the vertical direction as the symmetrical axis position, and the inclination angle of the string stretched between the insertion passages with respect to the horizontal direction is 0 ° or more and 0 A racket characterized by being 2 ° or less.   2. The racket according to claim 1, wherein an insertion passage through which a string forming a central region of the ball striking face is formed in the asymmetric position among the strings stretched in the lateral direction.   The insertion passage through which the string is inserted on both sides in the horizontal direction is formed by folding back the string to be stretched, and the folded position is formed at a position shifted in the vertical direction by the approximate diameter of the string. The racket according to claim 1 or 2. A racket including a frame in which strings are stretched in the vertical and horizontal directions to form a hitting surface,
The frame has a plurality of insertion passages through which the string is inserted,
The insertion passage through which the string is inserted on both sides in the vertical direction is formed at an asymmetrical position with the horizontal direction as the symmetrical axis position, and the inclination angle of the string stretched between the insertion passages with respect to the vertical direction is 0 ° or more and 0 A racket characterized by being 2 ° or less.   The racket according to claim 4, wherein an insertion passage through which a string forming a central region of the striking surface is inserted in the string extending in the vertical direction is formed at the asymmetric position.   The insertion passage through which the string is inserted on both sides in the longitudinal direction is formed by folding back the string to be stretched, and the folding position is formed at a position shifted laterally by the approximate diameter of the string. The racket according to claim 4 or 5. A racket including a frame in which strings are stretched in the vertical and horizontal directions to form a hitting surface,
The frame has a plurality of insertion passages through which the string is inserted,
The insertion passage through which the string is inserted on both sides in the horizontal direction is formed at an asymmetric position with the vertical direction as the symmetrical axis position, and the inclination angle of the string stretched between the insertion passages with respect to the horizontal direction is 0 ° or more and 0 .2 ° or less,
The insertion passage through which the string is inserted on both sides in the vertical direction is formed at an asymmetrical position with the horizontal direction as the symmetrical axis position, and the inclination angle of the string stretched between the insertion passages with respect to the vertical direction is 0 ° or more and 0 A racket characterized by being 2 ° or less.   The racket according to any one of claims 1 to 7, wherein the insertion passage is formed by a cylindrical portion that penetrates a hole formed in the frame.   The racket according to claim 8, wherein the cylindrical portion is inserted through the inner peripheral surface of the cylindrical portion with an approximately total length thereof.

Images