Impact vibration absorbers and devices that incorporated them

Details Impact vibration absorbers and devices that incorporated them Impact vibration absorbers and devices that incorporated them

1995-08-02

1998-06-16

Yamnitzky, Marie

Stock material or miscellaneous articles

Sheet including cover or casing

Foamed or expanded material encased

428 76, 428119, 428120, 428141, 428156, 428158, 4283044, 428909, B32B 300

Patent

active

057667209

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an absorber of impact-caused vibrations with superior impact-caused vibration absorbing performance, particularly the absorption of vibrations from devices associated with impact-caused vibrations, such as sports instrument, tools and bicycles.


BACKGROUND ART

Sports instrument subjected to impact forces include ball hitting devices such as various types of rackets, used in tennis, badminton, squash and racket ball, baseball bats and golf clubs. Tools include hammers, and bicycles include ordinary bicycles and motorcycles. Other devices associated with impact-caused vibrations include skis and fishing rods. In pursuit of such properties as being light-weight and having the ability to produce long-range shots, advances in the development of these devices have been made through changes in material from wood to metal and to composites.
However, some of these materials are associated with a variety of problems due to their low vibration absorption performance, including an uncomfortable sensation felt upon impact when hitting a ball as a result of residual vibrations and, above all, a severe shock suffered by players when the sweet spot is missed, which affects their elbows in tennis and develops into the so-called "tennis elbow" as the symptom becomes chronic. In baseball, too, batters are often subjected to severe impact forces, which render them unable to even hold the bat. The problem of vibration has also attracted attention in the areas of tools and bicycle handlebars.
Products aimed at mitigating impact-caused vibrations have been proposed and marketed, including racket "stabilizers" in tennis, which are made of rubber, hard synthetic resins, etc. and attached onto the netting to reduce its vibration. However, since they are not designed to directly absorb the impact-caused vibrations of the racket frame, they are naturally limited in their ability to alleviate the shock transmitted to the hand, although the impact sound and touch felt by the player change.
In Tokukaihei 1-262877, an invention incorporating a combination of an elastic string and a weight within the racket frame has been disclosed, and in Tokukaihei 1-288279, another invention incorporating a weight embedded in a small hole made near the grip section of a racket frame via a gel layer has been disclosed.
The former intends to transmit the vibrations of the racket frame to a weight via a fine filament-like elastic string, but it has problems in terms of its susceptibility to damage through exposure to repeated severe impacts and difficulties associated with the adjustment of the relationship between the string and weight.
The latter, on the other hand, places a gel layer and a weight in a small hole as an integrated unit, but also has problems in that it cannot absorb impact-caused vibrations on a stable basis due to the inability of its gel layer to retain the weight and the failure of the weight to stop oscillating swiftly after initial impact by responding to the reaction force to it.


DISCLOSURE OF INVENTION

This invention intends to offer absorber of impact-caused vibrations that rapidly attenuate impact-caused vibrations associated with the use of such devices as sports instrument, tools and bicycles without altering their functions or performance, and reduce uncomfortable sensations and numbness transmitted to the hand or hands after hammering, hitting, etc.
It absorbs impact-caused vibrations of the instrument body when a ball is hit by converting it to the kinetic energy of a weight by means of an impact-caused vibration absorption element consisting of the weight and an elastic body implanted into a section of the instrument such as the grip-end.
This weight works as an oscillator which develops vibration movement in response to an external impact, and its function as such an oscillator has been enhanced by embedding it in an elastic body.
The absorption of impact-caused vibrations for actual sports instrument is achieved effectively by implanting the absorber of this invention into

REFERENCES:
patent: 3845827 (1974-11-01), Schulin
patent: 4602549 (1986-07-01), Kumano
patent: 4722946 (1988-02-01), Hostettler
patent: 5143394 (1992-09-01), Piana
patent: 5180147 (1993-01-01), Anderson et al.
Translation of JP 02-048636 U, Apr. 1990.

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