| 摘要 |
A tennis gun comprises a chamber (1) connected to a source (10) of compressed air. It further has a barrel (13) for throwing the balls (16) connected to the chamber (1) through a valve (27) located against the butt-end (14) of the barrel (13), as well as a sleeve (17) for charging the balls (16) into the barrel (13). The valve (27) is provided with an actuating pneumatic chamber (28) connected to the source (10) of compressed air and connected to the atmosphere through an additional valve (32) provided with a remote control device (46). |
