Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1988-05-17
1990-08-21
Grieb, William H.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 73B, 273 73D, A63B 5114
Patent
active
049499688
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a racket for ball games, in particular tennis, comprising stringing for the surface of the racket, the stringing being passed through holes in the frame, a string which can be used for stringing purposes and a stringing device.
2. Description of Related Art
Rackets for ball games, in particular tennis rackets, are strung by a string being passed for example from the inside outwardly through holes in the rim of the racket, turned around and then passed from the outside inwardly again in the adjoining hole, thus providing generally a meander-type string configuration. If one string breaks, that naturally also affects the adjoining strings so that in that case in practice all the stringing has to be renewed. Another disadvantage of rackets with the known kind of stringing is that, as a result of the strings being turned around, the regions of adjoining holes, which are respectively towards each other, are subjected to high forces (referred to as hole edge forces) which can sometimes result in breakage, in particular after the racket has been in use for a prolonged period of time. Another disadvantage is that the operation of stringing rackets has to be carried out by means of expensive stringing devices which generally can only be operated by expert operators.
OBJECTS OF THE INVENTION
In order to overcome the above-indicated disadvantages, the invention seeks to provide a racket stringing arrangement that, in the event of breakage of a string, does not have any reaction on the adjoining strings so that only broken strings have to be replaced, and an arrangement wherein string replacement can be effected in a very simple fashion without an expensive stringing device.
SUMMARY OF THE INVENTION
In accordance with the invention, to solve the above problems, it is firstly provided that, in the case of a racket of the kind set forth in the opening part of this specification, the stringing has respective individual strings between oppositely disposed holes and the individual strings are held in the racket frame by means of rivet sleeves which fixedly embrace the strings and whose rivet heads bear against the outer edges of the holes. In that way the stringing of the racket has a number of individual strings corresponding to the number of mutually intersecting strings. By compressing the rivet sleeves which are disposed at the ends, it is easy to provide for a fixed connection between the rivet sleeves and the strings. The desired prestressing of the strings can be achieved in that a respective string which carries a fixedly disposed rivet sleeve only at one end is passed with its free end which does not have a rivet sleeve thereon through a hole in one edge of the frame and is then passed to the oppositely disposed side of the frame, possibly crossing over transverse strings which are already provided in the frame, and is then passed through the corresponding hole in an opposite side of the frame. Then, at that position, so-to-speak from the outside, a rivet sleeve is fitted onto the string, the string is prestressed and then the rivet sleeve is compressed so that it is also fixedly connected to the string and then, due to the prestressing applied, the rivet sleeve is allowed to slip into the hole in the rim of the racket in such a way that the rivet head comes to bear against the outer edge of the hole. As the prestressing which is initially applied to the string decreases by virtue of the rivet sleeve sliding into the hole, it will be appreciated that account is to be taken of that fact when determining the level of prestressing to be applied.
Because each string is fixed independently of other strings, in the event of such a string breaking it is possible to perform a repair by replacing only that individual string.
In another embodiment of the invention it can be provided that disposed between the rivet heads and the outer edges of the holes are respective supports or underlays of resilient material, preferably plastic material.
REFERENCES:
patent: 2040194 (1936-05-01), Whiteside
patent: 2091654 (1937-08-01), Roberts et al.
patent: 3664668 (1972-05-01), Held
patent: 3994495 (1976-11-01), Stoffel
patent: 4140316 (1979-02-01), Coupar
patent: 4484742 (1984-11-01), McCrone et al.
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