JP-7855293-B1 - Vibration absorber

JP7855293B1JP 7855293 B1JP7855293 B1JP 7855293B1JP-7855293-B1

Abstract

[Problem] To provide a vibration absorber that, when attached to a racket, can absorb vibrations caused by the ball's impact and provide acoustic feedback for the swing. [Solution] The vibration absorber 201 comprises an elastic plate-like portion 210 with an air port 211 formed therein, an elastic plate-like portion 220 with an air port 221 formed therein, and a connecting portion 230 connecting the elastic plate-like portion 210 and the elastic plate-like portion 220. An air passage 240 connecting the air ports 211 and 221 is formed inside the elastic plate-like portions 210, 220 and the connecting portion 230. A resonance chamber 212 extending outward from the air passage 240 is formed inside the elastic plate-like portion 210. This resonance chamber 212 generates a resonant sound due to the air flowing through the air passage 240. The inner diameter of the second air port 221 is larger than the inner diameter of the first air port 211, and the thickness of the elastic plate-like portion 220 is greater than the thickness of the elastic plate-like portion 210. [Selection Diagram] Figure 11

Inventors

折戸隆

Assignees

折戸隆

Dates

Publication Date: 20260508
Application Date: 20260218

Claims (4)

A first elastic plate-like portion having a first inner diameter and a first air vent formed therein, A second air vent is formed having a second inner diameter larger than the first inner diameter, and the second elastic plate-like portion extends parallel to the first elastic plate-like portion, spaced apart from the first elastic plate-like portion. It comprises a connecting portion that connects the first elastic plate-like portion and the second elastic plate-like portion, An air passage is formed inside the first elastic plate-like portion, the second elastic plate-like portion, and the connecting portion, connecting the first air port and the second air port. Inside the first elastic plate-like portion, a resonance chamber is formed that extends outward from the air passage, and generates a resonant sound by the air flowing through the air passage. The second elastic plate-like portion has a thickness such that the weight of the first elastic plate-like portion and the weight of the second elastic plate-like portion are balanced. Vibration absorber.
The vibration absorber according to claim 1, wherein the first air inlet, the second air inlet, and the air passage are aligned on the same line.
The vibration absorber according to claim 1, wherein tapered surfaces are formed on the first air inlet side and the second air inlet side, respectively, with respect to the resonance chamber.
The first elastic plate-like portion has a first convex portion that extends in an annular shape around the first air vent, The second elastic plate-like portion has a second convex portion that extends in an annular shape around the second air vent. A vibration absorber according to any one of claims 1 to 3.

Description

This invention relates to a vibration absorber, and more particularly to a vibration absorber that can be attached to the strings of a tennis racket. Conventionally, vibration absorbers capable of reducing the unpleasant vibrations that occur when the ball hits the racket have been widely used (see, for example, Patent Document 1). These vibration absorbers, when attached to the racket strings, suppress the transmission of unpleasant vibrations during ball impact to the player, thereby contributing to player comfort. Various shapes, materials, and mounting methods have been proposed for such vibration absorbers. However, conventional vibration absorbers have been specialized in mitigating vibrations, and while they may be used as decorative elements for the racket, very few possess any additional functions beyond that. On the other hand, in tennis practice, practice swings are performed to check form and improve swing speed. When the racket is swung at a certain speed during these practice swings, a whooshing sound is produced. Many players use this whooshing sound as an auditory cue to check their condition, their form and swing speed, and to improve their motivation during practice. However, for children, the elderly, and women with insufficient arm strength, it is difficult to swing the racket at a sufficient speed, resulting in little to no wind noise. Furthermore, even when wind noise is present, the volume is often low, making it difficult to hear due to surrounding noise. As a result, this can lead to decreased motivation for practice, poor form due to attempting to swing the racket forcefully, and even shoulder injuries. For advanced players, relying solely on wind noise makes it difficult to perceive improvements in their swing speed, resulting in a lack of a sense of accomplishment during practice and difficulty maintaining concentration. Japanese Patent Application Publication No. 9-019519 Figure 1 is a perspective view showing a vibration absorber according to a first embodiment of the present invention.Figure 2 is a front view of the vibration absorber shown in Figure 1.Figure 3 is a plan view of the vibration absorber shown in Figure 1.Figure 4 is a bottom view of the vibration absorber shown in Figure 1.Figure 5 is a cross-sectional view taken along line A-A in Figure 3.Figure 6 is a plan view showing an enlarged view of the recess in the vibration absorber shown in Figure 3.Figure 7 is a cross-sectional view taken along line B-B in Figure 6.Figure 8 is a cross-sectional view taken along the line C-C in Figure 6.Figure 9 is a schematic diagram showing the vibration absorber shown in Figure 1 attached to the racket.Figure 10 is a cross-sectional view showing a modified example of the vibration absorber shown in Figure 1.Figure 11 is a perspective view showing a vibration absorber according to a second embodiment of the present invention.Figure 12 is a front view of the vibration absorber shown in Figure 11.Figure 13 is a plan view of the vibration absorber shown in Figure 11.Figure 14 is a bottom view of the vibration absorber shown in Figure 11.Figure 15 is a cross-sectional view taken along line D-D in Figure 13. The embodiments of the vibration absorber according to the present invention will be described in detail below with reference to Figures 1 to 15. In Figures 1 to 15, identical or corresponding components are denoted by the same reference numerals, and redundant explanations are omitted. Furthermore, in Figures 1 to 15, the scale and dimensions of some components may be exaggerated, and some components may be omitted. In the following description and claims, unless otherwise specified, terms such as "first" and "second" are used solely to distinguish components from one another and do not represent a specific rank or order. Furthermore, when referring to something as "equal to" a specific number, unless otherwise specified, it means being within the range of 90% to 110% of that number. Figure 1 is a perspective view showing a vibration absorber 1 in one embodiment of the present invention, Figure 2 is a front view, Figure 3 is a top view, Figure 4 is a bottom view, and Figure 5 is a cross-sectional view taken along line A-A in Figure 3. As shown in Figures 1 to 5, the vibration absorber 1 includes an elastic plate-like portion 10 (first elastic plate-like portion) with an air vent 11 (first air vent) formed in the center, an elastic plate-like portion 20 (second elastic plate-like portion) with an air vent 21 (second air vent) formed in the center, and a cylindrical connecting portion 30 connecting the elastic plate-like portion 10 and the elastic plate-like portion 20. The elastic plate-like sections 10 and 20 are spaced apart in the Z direction and both extend parallel to each other along the XY plane. The gap between the elastic plate-like sections 10 and 20 is smaller than the outer diameter of the strings stretched on the racket; for example, the distance between the elastic pla