Measuring and testing – Dynamometers – Responsive to force
Patent
1979-12-31
1982-01-12
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to force
G01L 506
Patent
active
043099106
ABSTRACT:
A simple and inexpensive testing device for checking the tension of the strings of a tennis racquet, a badminton racquet or the like includes a string engaging member for engaging one of the strings of a previously strung racquet. This string engaging member may be bifurcated and be secured to a cylindrical block which is rotatably mounted in the front of a rigid elongated handle. A torsion element is mounted between the block and the rear of the handle, so that when the handle is rotated, and the torsion element is stressed, the handle will rotate relative to the block which is engaging the strings, and the amount of rotation of the handle relative to the block will be an indication of the tension of the strings. In addition, arrangements are provided for indicating that the string engaging member secured to the cylindrical block has been rotated through a predetermined angle. It is convenient to have a disk secured to the cylindrical block, with the disk being notched to indicate rotation through a predetermined angle, when the notch lines up with the strings in the racquet. In addition, the disk may be provided with a scale, and a pointer secured to the front end of the elongated handle and overlying the scale will indicate the number of pounds of tension in the strings, when the handle is rotated so that the notch previously mentioned lines up with the string.
REFERENCES:
patent: 2352730 (1944-07-01), Miessner
patent: 2400978 (1946-05-01), Collins
patent: 2461491 (1949-02-01), Booth
patent: 3831442 (1974-08-01), Cummins et al.
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