| 摘要 |
FIELD: process engineering.SUBSTANCE: invention relates to drive machine. Propose machine comprises case, cylinder arranged therein, piston, hammer, accumulator, primary valve, return air chamber and chamber air pressure control valve. Said piston is arranged inside said cylinder to reciprocate therein between first and second positions and to divide cylinder inner space into above-piston and under-piston chambers. Hammer is secured to said piston to strike the fastener. Accumulator accumulates compressed air to displace piston from first position to second position. Primary valve forces compressed air from said accumulator to above-piston chamber to displace said piston from first position to second position at actuation of trigger element. Return air chamber communicates with above-piston chamber when piston stays at second position. It communicates with under-piston chamber when piston stays at second position. It accumulates compressed air fed from above-piston chamber when piston displaced from first position to second position.EFFECT: longer life.16 cl, 22 dwg |
