Patent ID: 8137218

Claim:
A device for practicing tennis strokes, comprising: a supporting structure ( 1 ) having a base ( 1 a ); an arm ( 3 ) having a work trajectory; a torsion member ( 2 ) comprising a subunit ( 12 ) for adjusting a force acting on the arm ( 3 ) and dynamics of movement of the arm ( 3 ); a subunit ( 6 ) for adjusting the height of the arm; a subunit ( 8 ) for setting a deflection of the work trajectory of the arm; a subunit ( 9 ) for adjusting the angle of inclination of the torsion member to the vertical axis (B); and a clamping member ( 4 ) for non-invasively clamping a tennis ball ( 5 ); wherein said arm ( 3 ) comprises an element having a high elasticity; an end ( 3 b ) of said arm ( 3 ) lying opposite the ball ( 5 ) is fastened to said supporting structure ( 1 ) via said torsion member ( 2 ); and a connection ( 13 ) between said subunit ( 6 ) for adjusting the height of the arm, said subunit ( 8 ) for setting a deflection of the work trajectory of the arm, and said subunit ( 9 ) for adjusting the angle of inclination of the torsion member to the vertical axis (B), lies between a surface area (A) defined by said base ( 1 a ) of said supporting structure ( 1 ) and said end ( 3 b ) of said arm ( 3 ) lying opposite the ball ( 5 ).