| 摘要 |
The invention refers to the football, particularly to the ball projection device (fig.2), simulating football kicks along the certain trajectories with the preset intensity, characterised by that the device command and control system (fig.4), to increase the trainer operation safety, is provided with, at least, one of the following elements: - closing self-reset auxiliary contact (55), which is coupled with the closing self-reset auxiliary contact (56) and controls compress air inflow to the ball charger (5) pressure chamber (6); - closing self-reset auxiliary contacts (49 and 52), which are provided for consecutive triggering and are coupled with the hooter (50); - low tension circuit breaker (47) and current leakage differential relay (48), both inserted in the power line from the source (34), at that all the ball projecting device metal parts, which can turn out alive are grounded by connection to the power line neutral wire; - auxiliary contact (55), which prevent operating of the valve (13) if the auxiliary contact (56) is open and prevents compress air entering into the charger (5), till the pressure chamber (6) cap closure; - auxiliary contacts (49 and 52), which are disposed on the handle bar (19) different places, at that they are flush-mounted preventing the trainer erroneous or unintentional operation.
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