Patent ID: 8511527

Claim:
A dual safety combustion powered tool device comprising: a housing body defining a main chamber which extends in a longitudinal direction to terminate at nose and head ends; a handgrip body defining a subchamber which is adjacent to said main chamber; an ignition switch mounted in and movable relative to said subchamber between a switch-off position and a switch-on position where said ignition switch is switched on to ignite a combustion for initiation of a stroke movement; a trigger body disposed to be movable among an untriggered position, an initial-stage position, and a final-stage position; an actuating unit which is disposed to move with said trigger body, and which has a pivot area that defines a pivot axis, an actuated region, and an actuating region that is opposite to said actuated region relative to said pivot area, said actuating unit being turnable about the pivot axis between a first orientation in which said actuating region is guarded against movement with said trigger body toward said final-stage position so as to leave said ignition switch to remain in the switch-off position, and a second orientation in which said actuating region is engageable with said ignition switch when moving with said trigger body to the final-stage position, thereby displacing said ignition switch to said switch-on position; a first biasing member disposed to bias said actuating unit toward the first orientation; a push member disposed forwardly of and movable to said nose end between a normal position, where said push member is remote from said head end, and a pressed position, where said push member is closer to said head end as a result of being pressed against a targeted surface; a lever disposed in said main chamber to be turnable about a fulcrum axis, and having a power end and a weight end which confronts said actuated region in the longitudinal direction, and which is movable between a non-shifted position, where said weight end is remote from said actuated region, and a shifted position, where said weight end is closer to said actuated region; a second biasing member disposed to bias said weight end toward the non-shifted position; an actuator which is disposed forwardly from said power end, and which is coupled to move with said push member such that, when said push member is displaced to the pressed position, said actuator is brought to push said power end so as to move said weight end to the shifted position, and such that, when said actuating unit is moved with said trigger body to the final-stage position, said actuated region is brought to abut against said weight end to displace said actuating unit to the second orientation.