PERCUSSION ELECTRIC DRIVE Russian patent published in 1994 - IPC

FIELD: electrical engineering. SUBSTANCE: invention refers to electric hammer. When flip-flop operates with signal from counting input C inversive output of flip-flop applies inhibition to input circuits of logic gates. Reset of it is accomplished by signals from other change-over elements from output of proper pulse former through logic gate. Thus most of its operational time flip-flop is in interlocked state which does not allow power coils of motor to be changed over by false signals. EFFECT: improved stability of operational characteristics. 4 dwg