Racket-stringing tester

Details Racket-stringing tester Racket-stringing tester

1987-08-26

1989-07-11

Pinkham, Richard C.

Measuring and testing

Dynamometers

Responsive to force

273 73B, G01L 504

Patent

active

048460028

ABSTRACT:
A device for testing the stringing tension of a racket is made up of two components. The first component has a racket support surface with a recess therein. The second component is a cylinder containing a spring in compression with a slot in the cylinder indicating the compression load on the spring. The components are connected together with a connecting bolt passing through the racket. A spindle mounted on the connecting bolt and the first component applies pressure between the two components, acts on the strings of the racket and indicates racket tension by the amount of compression applied to the spring of the second component. The connecting bolt can also be threaded and the second component cylinder can be threaded thereon to apply pressure between the components. Distance sensing electrical contacts in the recess of the first component indicate when the reading is to be made.

REFERENCES:
patent: 1322123 (1919-11-01), Larson
patent: 1833195 (1931-11-01), Albright Jr.
patent: 4055999 (1977-11-01), Cope
patent: 4103546 (1978-08-01), Hickey et al.
patent: 4590808 (1986-05-01), Lightfoot et al.

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