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Racket shaft and racket equipped with such shaftRelated Patent Categories: Games Using Tangible Projectile, Player Held And Powered, Nonmechanical Projector, Per Se, For Projecting Aerial Projectile By Striking; Part Thereof Or Accessory Therefor, With User Shiftable, Adjustable, Or Interchangeable Weight For Use During Play Or With Freely Shiftable Mass For Increasing Impact ForceRacket shaft and racket equipped with such shaft description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060135295, Racket shaft and racket equipped with such shaft. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to a racket shaft that at one end is intended to be connected to a racket head, said racket shaft comprising a grip portion, said racket shaft at its other end having a knob that is detachably mounted on the racket shaft, said knob having an across dimension that is larger than the diameter of the portion of the racket shaft to which the knob is attached. The invention also relates to a racket equipped with a racket shaft according to the present invention. PRIOR ART [0002] From EP 0 898 988 A2 a racket shaft is previously known, said racket shaft having an exchangeable grip portion that can be mounted on and demounted from a core of the racket shaft. In order to anchor the grip portion to the core a screw is brought to cooperate with a wedge-shaped nut that is locked axially within the core. [0003] From U.S. Pat. No. 5,605,327 a racket shaft is previously known, said racket shaft at its free end having a butt cap that may be pushed on the free end of the racket shaft. The butt cap defines an internal cavity in which a ballast, in the shape of metal shot or metal discs, may be provided. [0004] From each one of U.S. Pat. No. 259,448 and U.S. Pat. No. 4,828,261 a racket shaft is previously known that is equipped with two depressions extending around the racket shaft, said depressions being located at a distance from each other in the longitudinal direction of the shaft. The transitions between the depressions and the adjoining portions are rounded. OBJECTS AND FEATURES OF THE INVENTION [0005] A primary object of the present invention is to present a racket shaft/racket that generally is a ergonomically designed in order to give the player a better grip, control, support and balance. [0006] Still an object of the present invention is to make certain portions of the racket shaft exchangeable. [0007] A further object of the present invention is to provide an improved balancing of the racket shaft. [0008] At least the primary object of the present invention is realised by means of a racket shaft/racket that has been given the features of the appending independent claims. BRIEF DESCRIPTION OF THE DRAWINGS [0009] Below an embodiment of a racket according to the present invention will be described with reference to the accompanying drawings, where: [0010] FIG. 1 shows a top view of a racket according to the present invention; [0011] FIG. 2 shows a detail of the racket shaft of the racket according to FIG. 1; [0012] FIG. 3 shows a section along III-III in FIG. 2; [0013] FIG. 4 shows an exploded view of the racket shaft according to FIG. 2, said shaft being composed of a number of exchangeable parts; and [0014] FIG. 5 shows the parts of FIG. 4 in assembled condition, where a number of sections are made in order to increase the clarity. DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE PRESENT INVENTION [0015] The racket according to the present invention, shown i FIG. 1, comprises a racket shaft 1 and a racket head 3 that mutually are rigidly connected in such a way that the existing forces may be transferred between the racket head 3 and the racket shaft 1. Generally, the racket shaft 1 according to the present invention has a new and innovative design while the racket head 3 is of a conventional design. [0016] As seen in top view according to FIGS. 1 and 2 the racket shaft 1 has a first thickened portion or a first bulging 5 and a second thickened portion or a second bulging 7. Between the first and second bulging 5 and 7 an intermediate portion 9 is provided, a rounded transition being present between the bulgings 5, 7 and the intermediate portion 9. [0017] Both bulgings 5 and 7 have also a rounded wave shape in the longitudinal direction of the racket shaft 1. Both bulgings 5,7 and the intermediate portion 9 are preferably equipped with an external grip wrap that is symbolised by the oblique lines 10 in FIGS. 1 and 2. This coating 10 is exchanged when it has been worn out. [0018] The two bulgings 5, 7 of the shaft 1 bring about an adaption to the anatomic gripping shape of the hand. The hand has a receiving negative (concave) gripping shape. When a hand grips a clod of clay of suitable size and squeezes it until a comfortable gripping thickness has been achieved, the result is an elongated body having a shape that corresponds to the bulgings 5 and 7 of the racket shaft 1. The reason why the shaft 1 is equipped with two bulgings 5, 7 is to make it suitable also for a two hand grip that is practised by many players, preferably in connection with backhanders. The distance between the two bulgings 5, 7, in the longitudinal direction of the racket shaft 1, may of course vary depending on the size of the hands of the player that is gripping the racket shaft 1. [0019] The cross section of the racket shaft 1 according to the present invention is shown in FIG. 3 and it is evident that a core 12 has a general square shape with bevelled corners. On the exterior of the core 12 a grip portion 13 is provided, said grip portion 13 on its external side having bulgings 5, 7 and the intermediate portion 9. Internally, the grip portion 13 is equipped with a layer 8, preferably of rigid plastic, and the cross section of this layer 8 is adapted to the cross section of the core 12, i.e. the layer 8 defines an internal hole of the grip portion 13. The rest of the grip portion 13, i.e. the portion having the bulgings 5, 7 and the intermediate portion 9, is preferably made out of silicone rubber or foamed rubber. This is of course only an example and the user may of course choose material in the grip portion in order to achieve an optimum of individual adaption. Continue reading about Racket shaft and racket equipped with such shaft... Full patent description for Racket shaft and racket equipped with such shaft Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Racket shaft and racket equipped with such shaft patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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