A - Human Necessities – 63 – B
Patent
A - Human Necessities
63
B
124/13
A63B 65/12 (2006.01) A63B 69/40 (2006.01) A63B 47/02 (2006.01)
Patent
CA 1137370
ABSTRACT OF THE DISCLOSURE A tennis practicing machine is disclosed which has a rotating arm for periodically projecting a tennis ball towards a player. A spring connected to the rotating arm stores a rotating force which is periodically released as the rotating arm passes a predetermined point causing ball emission. A power source control system is provided which controls rotation of the motor such that in order to insure safe operation of the machine, when the machine is turned off a ball is emitted if the rotating arm is within a pre- determined range near the point of ball emission. Accordingly accidental jarring or vibration of the machine does not cause accidental emission of a ball. Also, the system pro- vides a delay for starting emission of the ball when the machine is first turned on, and furthermore circuitry is provided to maintain a constant time period of operation regardless of power main frequencies of 50 or 60 Hz.
362199
Hirabayashi Tsugio
Imai Yuko
Katada Masayasu
Gowling Lafleur Henderson Llp
Sony Corporation
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