Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1977-10-03
1979-05-29
Apley, Richard J.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
A63B 5114
Patent
active
041565258
ABSTRACT:
A racket stringing apparatus includes a racket support frame rotatably mounted about a vertical axis on a suitable support base and including head and handle clamps for clamping the racket in the apparatus; an automatic tensioning head including an extensible arm having an automatic string head clamp mounted thereon, for extending outward from the support frame for applying a continuous preselected tension to a string attached thereto by the clamp; a cross slide platform mounted centrally of the support frame and between the racket clamps and including string holding clamps mounted on a slidable cross bar mounted on the cross slide platform, the cross slide platform being indexable to rotate about a vertical axis coincident with the vertical axis of the support frame. Power means for applying the continuous tension to the tension head includes, in one embodiment, a source of fluid pressure and a cylinder responsive to the pressure for applying a continuous preselected force on the string and valve controls including a valve responsive to the tension head clamp for activating the cylinder. An alternate embodiment includes weights of a preselected mass connected to the tensioning arm through a cable and pulley arrangement for applying a continuous uniform outward pressure on the tension head.
REFERENCES:
patent: 2262110 (1941-11-01), Mineck
patent: 2309849 (1943-02-01), Kausal et al.
patent: 3302950 (1967-02-01), Hartman
patent: 3441275 (1969-04-01), Held
patent: 3635080 (1972-01-01), Krueger et al.
patent: 3913912 (1975-10-01), Smith
patent: 3918713 (1975-11-01), Kaminstein
patent: 3988022 (1976-10-01), Halbrook
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