Swivel device for preventing twisting of strings subjected to to

Details Swivel device for preventing twisting of strings subjected to to Swivel device for preventing twisting of strings subjected to to

1989-09-08

1991-07-30

Hafer, Robert A.

Amusement devices: toys

Rotating or having visible rotating portion

Having attached cord for imparting rotation

446486, 446250, 24116A, A63H 106

Patent

active

050356674

ABSTRACT:
A device for eliminating the twisting and accompanying stress associated with yo-yo strings during operation by providing for rotation of the string about its central elongate axis without rotation of the yo-yo. The device of the present invention is inserted in-line between the yo-yo and the operator grip. The device includes two segments attached by a pivotal axis concentric with the string central axis. The string is divided into two segments, a device-yo-yo segment and a device-operator segment.

REFERENCES:
patent: 1771125 (1930-07-01), Kahle
patent: 1818301 (1931-08-01), Canaday
patent: 2563533 (1951-08-01), Knox
patent: 2639546 (1953-05-01), Shockey
patent: 2773328 (1956-12-01), Fraenkel et al.
patent: 3458993 (1969-08-01), Greene

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