Tennis racquet stringing calibrator

Details Tennis racquet stringing calibrator Tennis racquet stringing calibrator

1975-10-02

1976-06-22

Queisser, Richard C.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

73145, 273 73A, G01L 506

Patent

active

039642917

ABSTRACT:
A calibration device is disclosed and claimed herein for determining the accuracy of a tennis racquet stringing machine. A cross member is securable in the machine in similar fashion to a racquet being secured for stringing therein. The cross member has a frame secured thereto and extending outwardly therefrom with the frame having a resistance member, preferably a spring loaded scale, secured thereto. An elongated element such as a nonextensible wire is secured to the resistance member to be pulled in the machine in similar fashion to a racquet string. When the element is pulled, the resistance member is encountered and at the proper time, will determine the pounds of pull on the elongated element. The determined pull can be compared to settings on the stringing machine to determine accuracy thereof for calibration purposes.

REFERENCES:
patent: 2390802 (1945-12-01), Mars
patent: 3635080 (1972-01-01), Krueger et al.
patent: 3823609 (1974-07-01), Miyagawa et al.

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