Mechanical guns and projectors – Element – Means for producing projectile spin or deflection
Patent
1991-06-05
1993-11-30
Reese, Randolph A.
Mechanical guns and projectors
Element
Means for producing projectile spin or deflection
124 26, 124 84, 273 26D, F41B 1100
Patent
active
052655830
ABSTRACT:
This invention relates to an automatic ball control apparatus readily connectable to a ball ejector barrel on a ball ejector machine to impart top spin to ejected tennis ball members. The automatic ball control apparatus includes a ball top spin actuator assembly in one embodiment which includes 1) a fixed extension sleeve assembly secured to an outer end of the ball ejector barrel; 2) a sliding actuator sleeve assembly mounted about the fixed extension sleeve assembly; and 3) a spin actuator paddle assembly pivotally connected to the sliding actuator sleeve assembly. The spin actuator paddle assembly includes a main support lever member which is periodically pivotable to contact and impart top spin motion to a contacting tennis ball member. A second embodiment includes a ball top spin actuator assembly including 1) a fixed extension sleeve assembly secured to an outer end of the ball ejector barrel; and 2) a spin actuator paddle assembly connected to the fixed extension sleeve assembly. The spin actuator paddle assembly includes a main support level member having an arcuate contact surface which is pivotal to contact a tennis ball member to impart top spin thereto. The automatic ball control apparatus is operable to impart a combination of lateral, oscillating, and top spin motion to a tennis ball in a random fashion.
REFERENCES:
patent: 3288127 (1966-11-01), Bullock
patent: 3308802 (1967-03-01), Applegate
patent: 3640263 (1972-02-01), Rhodes
patent: 3807379 (1974-04-01), Vodinh
patent: 3838676 (1974-10-01), Kahelin
patent: 4006726 (1977-02-01), Sweeton et al.
patent: 4501257 (1985-02-01), Kholin
patent: 4570607 (1986-02-01), Stokes
Kim Harry C.
Reese Randolph A.
Rein Phillip A.
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