JP2007224971A - Vibration damping pipe and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem in which a pipe which is widely used as a raw material for many sporting goods gives impact to the arm or hand of a player, when actually used, causing sporting damage because its vibration damping function is rarely considered although its rigidity and weight are significantly improved in these years. <P>SOLUTION: This vibration damping pipe comprises a fiber reinforced plastic vibration absorbing material 4 fixed to an inner diameter side wall face 2 of a pipe body 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vibration damping pipe and a method for producing the same, and more particularly to a vibration damping pipe that is optimal as a material for sports equipment and a method for producing the same.

Pipes are often used as materials for various equipment, and are often used for sports equipment such as baseball bats, golf clubs, tennis rackets, ice hockey sticks, bicycle handles, and the like.
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  Pipes used in sports equipment, etc. have improved rigidity and weight, and their functions have been greatly improved, but the vibration control is not particularly considered, and a large impact is applied from the outside In some cases, it vibrates vigorously and damages the arm of the person holding it.

  For example, in the case of a baseball bat, the impact force at the moment the ball collides with a conventional wooden bat is moderately absorbed by the tree, so that a large impact force is not applied to the arm of the person holding the ball. If the bat is made of fiber reinforced plastic or metal material, which is much more rigid and light, the impact force at the moment the ball collides is directly applied to the arm and hand of the person holding the bat, causing movement disorders Sometimes it was.

  The present inventor has conducted excellent research to eliminate the disadvantages of conventional pipes lacking in vibration damping properties and to develop pipes having optimum vibration damping properties as sports equipment materials. As a result, the present inventors have excellent vibration damping properties. The pipe is completed and is proposed here as the present invention.

  The above-mentioned problem has been solved by constituting a damping pipe by adhering a vibration-absorbing material 4 made of fiber reinforced plastic to the inner diameter side wall surface 2 of the pipe body 1. In addition, the fiber mat piece 6 impregnated with a synthetic resin of a desired shape is attached to the outer peripheral surface of a nylon pipe 5 filled with gas, and the fiber sheet 7 impregnated with the synthetic resin is further wound thereon. These are placed in a thermoforming mold, heated at a predetermined temperature while being pressurized from the inside and outside to cure the synthetic resin impregnated in the fiber mat piece 6 and the fiber sheet 7, respectively, and then the thermoforming mold And the nylon pipe 5 is removed.

  Since the damping pipe according to the present invention has a two-layer structure by the pipe body 1 and the damping material 4 as described above, when a shock is applied to the pipe body 1 from the outside, the damping vibration is located inside the pipe body 1. The material 4 absorbs the impact force and attenuates the vibration of the pipe body 1. Therefore, when a golf club or a baseball bat is constructed with this vibration damping pipe, the impact applied to the golf club or bat by the ball is remarkably reduced, and the arms and hands of the player holding them are not numb. Injury can be effectively prevented. Moreover, since the external appearance is exactly the same as a conventional pipe, it does not give the user a sense of incongruity and is excellent in compatibility.

  The greatest feature lies in that the vibration absorbing material 4 for absorbing the impact applied from the outside is fixed to the inner diameter side wall surface 2 of the pipe body 1.

  1 is a perspective view of a damping pipe according to a first embodiment of the present invention, FIG. 2 is a transverse sectional view thereof, and FIG. 3 is a sectional view taken along the line AA in FIG.

  In the figure, reference numeral 1 denotes a pipe body. In the first embodiment, the pipe body is made of a so-called fiber reinforced plastic obtained by impregnating a carbon fiber or glass fiber with a synthetic resin, but a metal may be used as a raw material. Further, on the inner diameter side wall surface 2 of the pipe main body 1, a vibration absorbing material 4 made of fiber-reinforced plastic having an arcuate outer peripheral surface 3 curved with the same curvature as the curvature of the wall surface 2 is provided in the longitudinal direction. Along the core axis, they are fixed together with the same distance a, a.

  It is important that the damping material 4 is securely fixed to the inner diameter side wall surface 2 of the pipe body 1. When the pipe body 1 is made of fiber reinforced plastic, it is manufactured by the method described below. That is, as shown in FIG. 4, a cylindrical nylon pipe 5 filled with a gas such as air is prepared, and the outer peripheral surface of the nylon pipe 5 is impregnated with a synthetic resin to be a vibration absorbing material 4. The fiber mat pieces 6 are affixed at equal intervals, and further wrapped with a fiber sheet 7 impregnated with a synthetic resin to be the pipe body 1 to form a state as shown in FIG. The synthetic resin is cured by heating at a predetermined temperature while applying pressure from the inside and outside with a nylon pipe 5 and a thermoforming mold, and then taken out from the thermoforming mold and air is removed from the nylon pipe 5 to contract it. To complete the damping pipe with a two-layer structure. By such a process, it is possible to obtain a damping pipe in which the damping material 4 is integrally fixed to the inner diameter side wall surface 2 of the pipe body 1.

  If the pipe body 1 is made of metal, the vibration absorbing material 4 may be fixed to the inner diameter side wall surface of the pipe body 1 with an adhesive. Further, the vibration absorbing material 4 may have a cylindrical shape with a short length in addition to the bowl-shaped member as described above. In this case, as shown in FIG. A plurality of them are fixed in series so that the outer peripheral surface thereof is in contact with the inner diameter side wall surface 1 of one. Further, as shown in FIGS. 7 and 8, a vibration absorbing material 4 having a long cylindrical shape covering the entire inner wall surface 2 of the pipe body 1 may be used, and the shape of the vibration absorbing material 4 is the embodiment. It is not limited to what was shown in 1.

  Further, the cross-sectional shape of the pipe body 1 is not limited to a circular shape, and may be a rectangular cross-section such as that shown in FIG. 9 or a polygonal or elliptical cross-section such as a triangular cross-section as shown in FIG.

  Since the vibration damping pipe according to the present invention has a two-layer structure by the pipe body 1 and the vibration damping material 4 as described above, when a shock is applied to the pipe body 1 from the outside, the vibration damping pipe positioned inside the pipe body 1 is used. The material 4 absorbs the impact force and attenuates the vibration of the pipe body 1. Therefore, when a golf club or a baseball bat is constructed with this vibration control pipe, the impact applied to the golf club or bat by the ball is significantly reduced, and the arms and hands of the player holding them are not numb, and sports Injury can be effectively prevented.

  It can be used as a material for various sports equipment such as baseball and softball bats, ice hockey sticks, tennis and badminton rackets, golf club shafts, bicycle frames and handles.

1 is a perspective view of a vibration damping pipe according to Embodiment 1 of the present invention. FIG. Similarly, the longitudinal cross-sectional view of the AA line in FIG. The perspective view for demonstrating the first process of the manufacturing method of the damping pipe which concerns on this invention. Similarly, the perspective view for demonstrating the next process. The longitudinal cross-sectional view of the Example using the vibration-absorbing material 4 of the shape different from Example 1. FIG. Furthermore, the perspective view drawn through seeing the inside of the Example using the vibration-absorbing material 4 of another shape. Similarly, the longitudinal cross-sectional view. The end view of the Example from which Example 1 differs in the cross-sectional shape of the pipe main body 1. FIG. Similarly, the end view of the Example from which the cross-sectional shape of the pipe main body 1 differs from Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe main body 2 Inner diameter side wall surface 3 Outer peripheral surface 4 Damping material 5 Nylon pipe 6 Fiber mat piece 7 Fiber sheet

Claims (7)

A vibration damping pipe characterized in that a vibration-absorbing material 4 made of fiber reinforced plastic is fixed to an inner diameter side wall surface 2 of a pipe body 1. A fiber mat piece 6 impregnated with a synthetic resin of a desired shape is attached to the outer peripheral surface of a nylon pipe 5 filled with gas, and further wound on a fiber sheet 7 impregnated with a synthetic resin, and these are heated and molded. Put in the mold, heat at a predetermined temperature while applying pressure from the inside and outside, cure the synthetic resin impregnated in the fiber mat piece 6 and the fiber sheet 7, respectively, and then take out from the thermoforming mold and nylon pipe A method for manufacturing a vibration damping pipe, wherein 5 is removed. 2. The vibration damping pipe according to claim 1, wherein the pipe body is made of fiber reinforced plastic. The damping pipe according to claim 1, wherein the pipe body (1) is made of metal. 2. The vibration damping pipe according to claim 1, wherein the damping material has a bowl shape having an outer peripheral surface bent in an arc shape. 2. The vibration damping pipe according to claim 1, wherein the vibration absorbing material has a short cylindrical shape and is fixed in series to the inner diameter side wall surface of the pipe body at equal intervals. 2. The vibration damping pipe according to claim 1, wherein the vibration absorbing material has a long cylindrical shape and is fixed to the inner diameter side wall surface of the pipe body.

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