Mechanical guns and projectors – Projectile impelled by coacting wheels
Patent
1991-10-28
1993-01-12
Corbin, David H.
Mechanical guns and projectors
Projectile impelled by coacting wheels
124 81, 273 29A, A63B 6940
Patent
active
051781239
ABSTRACT:
A direction-control device for a tennis-ball shooter having a mount plate on which two motors are mounted for driving two wheels which together control a speed and a spinning extent of a tennis ball to be served. The direction-control device includes a first bar extending along a Z-axis and drivable by a first motor to allow a pivotal movement of the mount plate on a Y-Z plane about an X-axis upon a restricted rotational movement of the first motor, thereby controlling the served tennis ball to fall in front of or behind the practicer. The device-control device further includes a second bar having a first end attached to the mount plate and a second end drivably attached to a second motor to allow a pivotal movement of the mount plate on a Z-X plane about a Y-axis upon a restricted rotational movement of the second motor, thereby controlling the spinning axis of the tennis ball to be served. The direction-control device further includes a third bar having a first end attached to the mount plate and a second end drivably attached to a third motor to allow a pivotal movement of the mount plate on an X-Y plane about the Z axis upon a restricted rotational movement of the third motor, thereby controlling the served ball to fall at a left side or a right side of the practicer.
REFERENCES:
patent: Re28462 (1975-07-01), Halstead
patent: 3774584 (1973-11-01), Paulson
patent: 3913552 (1975-10-01), Yarur et al.
patent: 4325351 (1982-04-01), Yuasa
patent: 4712534 (1987-12-01), Nozato
patent: 5046476 (1991-09-01), Nozato
Corbin David H.
Thompson Jeffrey L.
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