Locking system for use with a trigger assembly of an electrical device

A trigger assembly for use with an electrical device, said electrical device having an electric switch housing with an electrical switch unit disposed therein, the trigger assembly including;

• a trigger member configured for movement relative to the housing;
• an actuator member operably-connected to the trigger member and, responsive to movement of the trigger member relative to the housing, said actuator member being movable in a first direction relative to the housing from an OFF position in which the electrical switch is operably-opened by the actuator towards an ON position in which the electrical switch is operably-closed by the actuator, and movable in a second direction relative to the housing from the ON position towards the OFF position;
• a lock-on mechanism including a first locking member mounted proximate to the trigger member and a second locking member mounted proximate to the housing, wherein when the actuator member is moved in to the ON position, said first and second locking members are selectably movable relative to each other into at least one of a locked configuration such that a first shaped portion of the first locking member releasably latches on to a suitably configured second shaped-portion of the second locking member, and the first shaped portion being configured to remain latched on to the second shaped-portion by urging of a return spring, whereby the actuator member is locked in to the ON position, and, an unlocked configuration whereby the actuator member is not locked in the ON position;
• and
• a lock-off mechanism including a lock-off member disposed on the trigger member, said lock-off member being rotatably movable about a first rotation axis between at least one of a locked-off position in which the lock-off member restricts movement of the trigger member relative to the housing and whereby the actuator member is restricted from being moved from the OFF position in to the ON position, and, a non-locked-off position in which the lock-off member does not restrict movement of the trigger member relative to the housing and whereby the actuator member is not restricted from being moved from the OFF position in to the ON position;
• wherein the trigger assembly includes a shaped-portion disposed proximate to the housing wherein said shaped-portion is configured to abut against the lock-off member when the trigger member is moved towards the housing with the lock-off member rotatably arranged in to the locked-off position, whereby the actuator member is restricted from being moved from the OFF position in to the ON position;
• and
• wherein, said trigger assembly is characterised in that the lock-off member includes a torsion spring configured for urging the lock-off member towards the non-locked-off position, and wherein said lock-off member includes a concave portion within which the torsion spring is received therein.