Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1991-05-16
1993-02-02
Millin, V.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 73R, 273 73G, A63B 4902
Patent
active
051832658
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a racquet, in particular a tennis racquet, having a handle and a stretcher frame secured via a throat region for stringing, in which the cross-section of the frame measured transversely to the stringing has at least one section of largest dimension.
A tennis racquet of the kind described at the beginning is shown, for example, in EP-A 176 021. In this known tennis racquet the width of the frame body increases, starting from the handle up to the mid-section of the stringing oval, and subsequently decreases again towards the racquet head. It is the purpose of this known design to adapt the resonant frequency of the strung racquet fixed to the handle approximately to the length of time the ball is in contact with the stringing.
When constructing a racquet it is important to keep undesired vibrations away from the handle and thus from the hand or arm of the player. If such undesired vibrations can be avoided, then it is subsequently possible to control the vibration in the handle area. At the same time, racquets are mostly constructed so that they are as light as possible and have a narrow construction transversely to the cross-sectional plane of the stringing, whereby however, the racquet is on the whole weaker and avoidance of vibrations is only inadequate.
The present invention aims to provide a racquet of the kind described at the beginning in which better control of vibrations in the handle area is possible even with a frame body that is light and narrow. To solve this object, the racquet according to the present invention is for the most part designed so that the cross-section of the stretcher frame in the throat region and in the region of the racquet head remote from the throat region is greater than in the region of the stretcher frame lying therebetween, whereby the cross-section in the region of the racquet head remote from the throat region is greater than that in the throat region. The weaker design of the frame, which can for the most part be attributed to the roundness of the frame in the head and throat regions, is compensated for by the fact that the cross-section of the stretcher frame in the throat region and in the region of the racquet head remote from the throat region handle is greater than in the region of the stretcher frame lying therebetween. The weaker sections are thus reinforced, which evens out the flexural properties over the length of the racquet from the handle to the head and subsequently results in easier controllability of vibrations. In addition to increasing the cross-section in the markedly rounded region at the racquet head and in the region of the throatpiece, these regions can, in accordance with a preferred embodiment of the present invention, also be made more resistant to bending by other measures. The only restriction to a more bending resistant design of these regions is the weight which increases with the use of more bending resistant inserts. Owing to the fact that the depth of the frame at the racquet head is greater than in the region of the throatpiece, dependence of the deflection of the racquet on the distance from the handle area is linearized while the vibrating mass in the region of the throatpiece is at the same time reduced. Whereas the dependence of the deflection on the distance from the handle is as a rule not constantly differentiable in conventional racquets and has a varying sign particularly at the transition points into the stringing oval, extensive linearization is already achieved if the first differentiation either has a constant sign over the length of the racquet or lies absolute in narrow limits.
It is an advantage of the embodiment that the change in the deflection over the length of the racquet amounts to less than 0.5 mm, in particular less than 0.3 mm, whereby under the test conditions according to HSTM standard 197-A the deflection is between 0.4 mm and 0.9 mm, preferably between 0.5 mm and 0.8 mm.
In accordance with the present invention, the racquet is advantageously designed in such a way that the
REFERENCES:
patent: 1539019 (1925-05-01), Nikonow
patent: 4280699 (1981-07-01), Drake
patent: 4664380 (1987-05-01), Kuebler
patent: 4725059 (1988-02-01), DuGardin et al.
patent: 4768786 (1988-09-01), Kuebler
patent: 4911444 (1990-03-01), Yoneyama
patent: 4919438 (1990-04-01), Yoneeyama
patent: 4997186 (1991-03-01), Carr
patent: 5037098 (1991-08-01), Davis
Umlauft Helmut
Wager Karl-Heinz
Chiu Raleigh W.
Head Sportgerate Gesellschaft m.b.H. & Co. OHG
Millin V.
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