The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 1985
Filed:
Jan. 21, 1983
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A ball throwing machine for hitting out tennis balls or the like at predetermined time intervals, in which a lock cover is rotatable or slidable into engagement with a switch which is capable of making and breaking an electric current to a drive motor. Said lock cover is mounted in a position adjacent to a rotating trace of a hitting lever. In the event an object other than ball, for example, a hand, a finger or a rod, should be drawn into the interior of the machine together with the hitting lever while this lever is rotated by a motor to expand a biasing spring, the lock cover will rotate or slide to break the electric current to the motor and stop the motor immediately, thereby preventing the occurrence of injury.