Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1991-06-06
1993-02-16
Millin, V.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 73B, 273 73D, A63B 5114
Patent
active
051864592
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for stringing rackets for ball games, in particular tennis, with individual strings, and a device for carrying out that process.
2. Background of the Prior Art
German utility model No. G 86 24 960 discloses a device for stringing rackets with individual strings, comprising a contact portion which can be fitted on to the rim of the racket and a holding portion which is provided to bear against the inside edge of the racket, together with a tensioning means with a clamping means for holding the string fast. There is also provided a measuring device for indicating the tension attained, and a device for clamping the rivet sleeve fast when the string is tensioned.
That arrangement suffers from the disadvantage that the individual string to be tensioned which is introduced from the opposite side of the rim of the racket, crossing the possibly existing string, and which is fixed on the opposite side of the rim of the racket, must be passed through the tensioning head of the tensioning device in order to apply the tensile tensioning force which is done by means of clamping jaws. That operation which can be referred to as the "threading-in operation" suffers from disadvantages in the context of practical operation for the procedure for stringing a racket with individual strings is intended inter alia to make it possible for the tennis player who has suffered a broken string to renew that string on the spot.
OBJECTS OF THE INVENTION
The invention is based on the problem of proposing a process for stringing rackets for ball games, in particular tennis rackets, with individual strings, and a device which is suitable for that purpose, permitting operation which is as simple as possible.
BRIEF SUMMARY OF THE PRESENT INVENTION
To solve that problem, the process according to the invention proposes the process steps recited in the characterizing portion of the claims. The fact that the tensile force is now applied to a thickening on the individual string means that there is no need for the troublesome operation of threading in the string, which was required in accordance with the previous process, as the tensile force can be applied by engagement of a claw or the like on the thickening. The thickening is therefore not clamped but is loosely mounted in the claw element. When the tensile force is applied, no damage is done to the individual string by clamping elements and the individual string can rotate by virtue of the initially loose contact thereof in the claw, before the tensile force is applied.
The thickening may be provided from the outset in an end region or at an end of the individual string. It is then necessary for a rivet sleeve firstly to be pushed on to the string, prior to the individual string being introduced into the racket, in such a way that the rivet head of the rivet sleeve is towards the thickening. Then, a rivet sleeve is clamped in position on the individual string on the "oppositely disposed" outward side of the racket, then the tensile force is applied to the thickening, the rivet sleeve which had been previously fitted on to the string is clamped fast and then the tensile force is reduced so that the rivet sleeve which is now fixed in position slips into the bore due to the tension which still remains until the rivet head bears against the edge of the bore and thus the string is tensioned. It is then only necessary to cut off the end of the individual string which has the thickening.
It will be appreciated that it is alternatively also possible for an individual string without thickening to be first introduced, and then arrested at one edge of the racket. The loose rivet sleeve is then firstly pushed on to the free end of the string which projects outwardly on the then oppositely disposed side, and then a thickening is applied, for example by clamping a corresponding element thereon. That element clamped on the string can then also be gripped with a forked claw for applying the tensile force.
A device
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patent: 4333649 (1982-06-01), Vaugh et al.
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patent: 4484742 (1984-11-01), McCrone et al.
patent: 4491322 (1985-01-01), Heilman
patent: 4949968 (1990-08-01), Korte-Jungermann
Chiu Raleigh W.
Millin V.
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