Tennis rackets
AssigneeDonnay International S.A.
InventorHugo Sol
Life of this patent
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AssigneeDonnay International S.A.
InventorHugo Sol
Estimating the term…
A tennis racket is disclosed which has a frame joined to a longitudinally extending handle on an axis of symmetry of the racket. A handle of the frame defines annular opening which is covered by stringing tensioned in a plane extending across the opening. Two connecting arms attach the handle to the frame and a reinforcement member between the two connecting arms defines a portion of the annular opening. The height of the main portion of the frame in a direction perpendicular to the stringing plane is at least essentially constant between the connecting arms and an end portion of the frame, the width of the frame in the main portion thereof being between about 50% and 75% of the frame height. Further, an end portion of the frame, including the top end thereof, has a cross section which increases from the main portion of the frame to the top end. The racket frame further has a cross section defined by a tubular profile having a reentrant concave portion at the outer side thereof, upper and lower summit areas adjoining the surface of the frame facing the annular opening thereof, and substantially flat wall portions therebetween which are inclined relative to the stringing plane at an angle between 25.degree. and 65.degree..
A tennis racket having a longitudinal axis of symmetry which comprises a handle extending substantially along the longitudinal axis, a head defined by a frame having an annular opening, stringing mounted on said frame and tensioned across said opening substantially along a plane, two connecting arms extending between the head and the handle and directly joining the head to the handle, and a reinforcement member extending between the two connecting arms, the head comprising a main portion in which a height of the frame measured perpendicularly to the plane of the stringing is at least essentially constant and extends from the ends of the connecting arms to beyond a region of the head of the racket having a maximal head width as measured in the plane of the stringing perpendicularly to the longitudinal axis, a cross-sectional width of the frame in the main portion corresponding to a value of between 50% and 75% of the height of the frame, and an end portion located at the opposite end from the handle, a width of the cross section of the frame measured in the plane of the stringing increasing in the end portion towards a top end of the frame, wherein said reinforcement member is arranged between the two connecting arms, the reinforcement member delimiting the opening of the frame on the side of the handle and being provided with apertures for receiving strings of the stringing in the same manner as the frame surrounding the opening, and wherein said reinforcement member has a height which increases in the direction of its center whereas the width of the cross section decreases.
A tennis racket having a longitudinal axis of symmetry comprising a handle extending substantially along the longitudinal axis, a head defined by a frame having an annular opening and adapted to be provided with stringing mounted on said frame and tensioned across said opening substantially along a plane, connecting arms extending between the head and the handle, a reinforcement member extending between the connecting arms, the frame being formed of a tubular, thin walled, closed profile, said profile being defined by a reentrant concave portion at an outer side of the frame opposite from the annular opening, upper and lower summit areas, and first and second, substantially flat wall portions joining the concave portion to the respective upper and lower summit areas, said substantially flat wall portions being inclined with respect to the plane of the stringing at an angle .alpha. of between about 25.degree. and 65.degree..
Tennis racket having a longitudinal axis of symmetry which comprises a handle extending substantially along the longitudinal axis, a head defined by a frame having an annular opening, stringing mounted on said frame and tensioned across said opening substantially along a plane, two connecting arms extending between the head and the handle, and a reinforcement member extending between the two connecting arms, the head comprising a main portion in which a height of the frame measured perpendicularly to the plane of the stringing is at least essentially constant and extends from the ends of the connecting arms to beyond a region of the head of the racket having a maximal head width as measured in the plane of the stringing perpendicularly to the longitudinal axis, a cross-sectional width of the frame in the main portion corresponding to a value of between 50% and 75% of the height of the frame, and an end portion located at the opposite end from the handle, a width of the cross section of the frame measured in the plane of the stringing increasing in the end portion towards a top end of the frame, the height of the frame in the connecting arms varying between the height of the frame in the main portion and the height of the core at the end of the handle close to the head, and the contour of the connecting arms decreasing from the head portion to the handle, and the overlap length of the composite material forming the arms increasing from the head portion to the handle.
Dependencies are inferred from the claim text.