Sports racquet
OwnerGuy Guillem, Rene A. Vinci +1inventors
InventorsGuy Guillem, Rene A. Vinci, Gilbert C. Roche
Life of this patent
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Abstract
The strings of a tennis racquet are tensioned by passing over a liquid-containing flexible tube in the frame of the racquet with means provided in the handle of the racquet for providing pressure to the liquid in the tube to increase or decrease the tension of the strings.
Claims11
A racquet comprising a frame provided with a peripheral groove, in the head of the racquet, a liquid-containing flexible tube deformable by the pressure of the liquid therein and located in said groove the said tube being disposed in relation to the stringing so that the tension in the stringing applies a crushing force to the said tube, means for subjecting the liquid in said tube to a superatmospheric pressure, and resilient means for damping the liquid pressure changes in said tube due to sudden variations in the tension of the stringing caused by the impact of a ball, wherein said means for subjecting the liquid to a superatmospheric pressure comprises a hydraulic pressure adjustment device located in the handle of the racquet and capable of being operated by the user to vary the liquid pressure in said tube and thus to adjust the tension of the stringing.
A racquet according to any one of the preceding claims and including at least one calibrated orifice in the pressurising means or the flexible tube to constrict the flow of liquid induced by a change in the string tension.
Dependencies are inferred from the claim text.