FIELD: construction industry. SUBSTANCE: driving mechanism of portable percussive tool has body with working conduit housing working tool, piston, percussive element, main and additional combustion chamber made identical, each of them having additional conduit where return valve is placed. Each combustion chamber carries charge. Each blasting device is fabricated in the form of electric primer put into proper chamber and connected to controlled switch linked to power supply source. Working chamber is formed between working conduit and additional conduits. Mechanism includes synchrosensor mounted in body for interaction with working tool, pressure reducer installed in working conduit and pressure transducer positioned in working chamber. EFFECT: simplified design, enhanced operational reliability. 4 cl, 5 dwg
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