Abstract A frame for a badminton, squash or tennis racket is made by forming a hollow metal tube with a recess or groove extending longitudinally so that the strings of the racket may nest therein; forming a plurality of holes in opposite walls of the tube, with the edges of each of the holes having flanges whose free edges are inside the tube; heating the tube, then plunging the tube into a mass of a suitable nylon powder through which air is constantly passing; agitating the tube to cause a nylon coat to cover and adhere to all the outer surfaces of the tube and the flanges including the free edges thereof, thereby to cover the sharp edges of the metal around the holes; and removing the tube and preparing it for stringing. In a modification, a solid metal extrusion is used instead of a hollow tube, holes are drilled in the extrusion at suitable intervals for the strings, eyelets are fitted in said holes to cover the sharp edges of the holes, then the same process is followed to put a nylon coat on the outside of the extrusion and on the eyelets.
A method of manufacturing a badminton, tennis or squash racket frame which comprises starting with a length of tubular steel; forming a hollow or groove on the side of the tube which is to be outside of the frame, said hollow or groove being suitably formed so that the strings of the racket may nest therein; forming a plurality of holes in opposite walls of the tube in such a manner that the edges of each of the holes are provided with flanges whose free edges are inside the tube; heating the tube to an elevated temperature then plunging the tube into a mass of a suitable nylon powder through which air is constantly passing; agitating the tube to cause a nylon coat to cover and adhere to all the outer surfaces of the tube and said flanges including the free edges thereof, thereby to cover the sharp edges of the metal around the holes; and removing the tube and preparing it for stringing.
Claim 2
Independent Claim
164 words
A method of manufacturing a badminton, tennis or squash racket frame which comprises starting with a length of tubular steel; forming a hollow or groove on the side of the tube which is to be outside of the frame, said hollow or groove being suitably formed so that the strings of the racket may nest therein; forming a plurality of holes in opposite walls of the tube in such a manner that the edges of each of the holes are provided with flanges whose free edges are inside the tube; heating the tube to an elevated temperature then plunging the tube into a mass of a suitable nylon powder through which air is constantly passing; agitating the tube to cause a nylon coat to cover and adhere to all the outer surfaces of the tube and said flanges including the free edges thereof, thereby to cover the sharp edges of the metal around the holes; and removing the tube and preparing it for stringing.