| 摘要 |
<p>A tranquilliser dart has a head (1) of certain outside dimension, releasably fixed to a barrel (2) of substantially smaller outside dimension. This barrel contains a rubber piston (5). The aforementioned head possesses an integral hypodermic needle (7), this needle has a hole in the side, near the said point. The hole in the needle is sealed by a rubber sleeve (6). Permanently fixed to the barrel (2) at the opposite end to the head (1) is a flight ring (3) and a one piece ventable valve (4). The said valve allows compressed air to be pumped into the rear of the dart by means of a venting needle (8) and ordinary hypodermic syringe (9). The said valve (4) maintains the air pressure during use of the dart. The said valve also allows the air pressure to be drawn out of the rear of the loaded dart by means of the venting needle, thus making the dart safe.</p> |
