发明授权
US3702701A Metal tennis racket with plastic throat piece and molded plastic handle 失效
金属地板与塑料薄膜和模塑塑料手柄

Metal tennis racket with plastic throat piece and molded plastic handle
摘要:
THE METAL RACKET IS MADE FROM AN EXTRUDED ALUMINUM STRIP COMPRISING A PAIR OF OPPOSED TUBULAR SECTIONS CONNECTED BY A WEB, WITH A STRENGTH FACTOR OF 1YS/A IN THE RANGE OF 0.0516YS TO 0.0580YS. THE METAL STRIP HAS A FIRST CHANNEL IN ITS OUTER PERIPHERY AND A SECOND CHANNEL IN ITS INNER PERIPHERY. A PLASTIC THROAT PIECE IS PROVIDED WITH OUTER SURFACES SHAPED COMPLEMENTARILY TO THE CONFIGURATION OF THE INNER PERIPHERY OF THE METAL STRIP. THE RACKET FURTHER HAVING A SOLID MOLDED PLASTIC HANDLE MADE OF A FOAMED PLASTIC MATERIAL MOLDED TO THE LOWER EXTERMITIES OF THE METAL STRIP.
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