School tablet safety pin is prevented stinging by anticreep

School tablet safety pin is prevented stinging by anticreep is including a safety pin and a sleeve and an elastic card sleeve, its characterized in that: the sleeve is the one end of a cylinder and seals the little drum of other end open -ended, telescopic internal diameter is 2 times-6 times of safety pin head external diameter, the telescopic left side outside is close to the welding of sleeve opening part has a safety pin, the telescopic left side outside is close to the welding of the sleeve department of sealing has an elastic card sleeve, elastic card sleeve's one end welding is at the sleeve lateral surface, elastic card sleeve's the other end is an annular cutting ferrule ring, a sleeve circular arc mouth through sleeve central authorities stretches into in the sleeve, stretch into the ring center erroneous tendency sleeve circular arc mouth of the cutting ferrule ring in the sleeve, make the cutting ferrule ring on elastic card sleeve's the syringe needle recess of the drop -down card of spring force effect at the safety pin head, thereby make the unable slippage of safety pin head go out the sleeve, the safety pin not welded other end is the safety pin head, there is one section concave thin pole of thinner syringe needle the nearly needle point position of safety pin head rest.