FIELD: process engineering.
SUBSTANCE: invention relates to electrical tool for driving fasteners. Said tool incorporates motor drive. Driving comprises first job wherein contact arrester moves up and second job wherein cock operates. Note here that it is desirable to prevent spontaneous operation of said cock. The latter does not operate unless third job is performed to unlock retaining lever that allows a reliable protection against spontaneous operation of said cock.
EFFECT: ruling out of spontaneous operation.
2 cl, 14 dwg
