| 摘要 |
In some embodiments, devices for measuring strings of a racket include a housing and a button. The devices also include a setting device that determines the frame size of the racket in response to the button being depressed and a spring system that adjusts pre-tension of the strings in response to the button being depressed. The devices further include a calibrated leaf spring having strain gages and an adjustment screw which is affixed to the button and which makes the starting measuring pressure onto the calibrated leaf spring adjustable. The devices still further include a fixing part which becomes fixed to the housing when force is applied to the button that causes the spring system to reach a specified level of compression and a display that reflects pressure on the strings in response to pressure applied to the strain gages.
|
