Ball retrieval device for ball games, particularly for...

Games using tangible projectile – Playing field or court game; game element or accessory... – Practice or training device

Reexamination Certificate

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Details

C473S423000, C473S459000, C473S463000

Reexamination Certificate

active

07048653

ABSTRACT:
A ball retrieval device, particularly for integration in a tennis racket, includes a rotatable spool with a longitudinally displaceable carriage arranged thereon. Through rotation of the spool, a rubber-elastic thread element can be wound up on the latter or unwound therefrom, the carriage providing a well-tuned process with maximum compactness of the turns. To this end, the surface of the spool is provided with a helical groove in which the thread element is laid.

REFERENCES:
patent: 2094536 (1937-09-01), Heimers
patent: 2128610 (1938-08-01), Heimers
patent: 2806700 (1957-09-01), Heimers et al.
patent: 2945694 (1960-07-01), Heimers et al.
patent: 2945695 (1960-07-01), Heimers et al.
patent: 3065563 (1962-11-01), Bascom
patent: 3168312 (1965-02-01), Davis
patent: 3635475 (1972-01-01), Brown
patent: 3735934 (1973-05-01), Black
patent: 3876162 (1975-04-01), Chun et al.
patent: 4023797 (1977-05-01), Sarrasin
patent: 4753442 (1988-06-01), Bland
patent: 4784389 (1988-11-01), Taylor
patent: 413044 (1936-01-01), None
patent: 205524 (1923-10-01), None
patent: 491536 (1938-09-01), None

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