US 4,376,535 AGranted

Machine for stringing rackets

AssigneeSnauwaert & Depla

InventorsAndre Muselet, Jacques Muselet

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Abstract

The racket-stringing machine comprises a cradle for locking a racket frame in position and means for applying tension to a racket string. In order to apply tension to the string which is attached to the racket frame, a carriage is located externally of the cradle and provided with means for anchoring the string, for guiding and displacing the carriage in translational motion in the direction of withdrawal or approach with respect to the cradle and for applying tension to the string. The instantaneous tension of the string is compared at each instant with a predetermined tension to be established in order to permit displacement of the carriage in the direction of withdrawal as long as the instantaneous tension is lower than the predetermined tension, the carriage being then locked in position when these tensions are of equal value.

Claims13

Dependent claims

In a racket-stringing machine comprising a supporting table, and on the supporting table a cradle for locking a racket frame in position, a movable clamp 20a for temporarily immobilizing a racket string, means for applying tension to a racket string which is stationarily secured by means of said movable clamp in one zone of the frame, and means mounting said tensioning means freely displaceably in sliding motion in a second zone of said frame as a result of a tractive force exerted on one zone of the racket string located beyond the second zone with respect to the first;

the improvement comprising two substantially horizontal arms 21a, 22a on which said movable clamp 20a is mounted, said arms being located at slightly different heights and being rotatably displaceable about spaced vertical axes 23a, 24a located on each side of the cradle in diametrically opposite relation as seen from above, the length of each said arm being shorter than the distance between said two axes 23a, 24a and the point of intersection of said arms being such as to describe at least the entire internal surface of the racket frame and part of the periphery of said frame.

the improvement in which said means for applying tension to a racket string comprises:
a carriage located externally with respect to the cradle and having means for anchoring said racket-string zone;
means for guiding and displacing the carriage in translational motion in the direction of withdrawal or approach with respect to the cradle in order to apply a tractive force to the racket string;
means mounting the anchoring means on the carriage for rotation with respect to the carriage about an axis at right angles to the direction of said translational motion;
means acting elastically in opposition to said movement of rotation;
and
means for comparing the instantaneous angular position of the anchoring means with a predetermined angular position corresponding to the application of predetermined oppositely-acting force to the anchoring means by the racket string and by the means for acting elastically in opposition to the rotation of the anchoring means.

4 more elements

Dependencies are inferred from the claim text.