Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1992-03-13
1993-08-31
Millin, V.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 67R, 273 81R, A63B 4908
Patent
active
052402479
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a racquet for ball games, in particular a tennis racquet, having a grip and a head with a striking surface, wherein the head is arranged to rotate to a limited degree in relation to the grip about the longitudinal axis of the grip, and wherein spring and damping elements are fitted between the grip and the shaft of the head in recesses extending in the longitudinal direction of the grip.
GB Patent 30 153 A.D. 1909 disclose racquets, in particular cricket bats, hockey sticks or the like, which have a shaft wrapped with rubber, against which the grip can be pressed by inserting molded bodies. Wrapping the shaft with rubber is supposed to result in shock absorption 7hereby, depending on the properties of such rubber material, a certain degree of elasticity is attained. A significant damping cannot be readily achieved, however with rubber bands which are compressed. A tennis racquet of the above-noted type is described in WO 90/05567 in which rubber elastic bodies and bodies consisting of shock-absorbing material are inserted between the polygonal contour of a shaft and the also polygonal inside contour of a grip. In this known version, the head can be rotated to a limited degree relative to the grip about the longitudinal axis of the grip and about the nodal point of vibration in the grip area during an oscillation of the first order of the freely suspended racquet. The rubber elastic bodies and the shock-absorbing bodies were hereby staggered in relation to one another in peripheral direction of the grip, so that, on the whole, large-scale profiles had to be selected with smaller grip dimensions in order to ensure the required stability and rigidity of the shaft or grip.
It is now the object of invention to create a racquet of the above-noted type in which a sufficient springiness and damping can be ensured even with smaller grip dimensions, and without any significant reduction in the cross-section of the shaft. Moreover, it is possible to adjust the spring and damping properties to meet specific requirements. In addition, the invention aims to attain a springiness and damping in the grip area so that not only torsional vibrations can be effectively damped, but longitudinal vibrations can also be safely absorbed. To meet this object, the invention here relates to a racquet where separate spring and damping elements are placed, adjacent to one another, i.e., in pairs, each in the direction of the longitudinal axis of the grip, in each of a plurality of longitudinal recesses extending in direction of the longitudinal axis of the grip between the grip and the shaft of the head. As a result of the fact that, in addition to spring elements, separate damping elements are placed in a majority of recesses extending in longitudinal direction of the grip, it is first of all made possible to adjust the springiness and damping to one another by selecting the respective effective length of the spring or damping element, so that an effective damping is actually attained. By placing the spring and damping elements in the same recess, space is saved so that an effective springiness and damping also becomes possible with small grip dimensions without reducing the cross-section of the shaft. Due to the fact that spring and damping elements are placed adjacent to one another in axial direction in a common recess extending in longitudinal direction of the grip, an effective damping of pitching vibrations or longitudinal vibrations is at the same time made possible by appropriately arranging such spring and damping elements, whereby this damping of the longitudinal vibrations can be accurately adapted to the specific requirements independent of the damping of the torsional vibrations by axially positioning spring and damping elements accordingly. Advantageously, the object of the invention is essentially attained thereby that the spring elements and/or damping elements have lateral faces converging the axis of the grip, in particular, an essentially trapezoidal cross-section. Such spring or damping elemen
REFERENCES:
patent: 4033583 (1977-07-01), Ehrhart
patent: 4609198 (1986-09-01), Tarr
patent: 4693475 (1987-09-01), Keilhau
patent: 5088734 (1992-02-01), Glava
patent: 5135223 (1972-08-01), You
Chiu Raleigh W.
Head Sport Aktiengesellschaft
Millin V.
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