Driving tool for fasteners including locking means

Claim 1

A driving tool for fasteners, said driving tool comprising: actuating means suited for connection with an energization source for actuating a drive means, said drive means being capable of initiating a drive-in pusher so as to drive in fasteners from a mouth tool; a trigger lever pivotally mounted for movements between a trigger rest position and a trigger actuated position to actuate said actuating means, said trigger lever having a first abutment portion and a first limiting portion thereon; and a sensor mounted for movements relative to said mouth tool and adapted to be moved from a sensor rest position into a sensor operative position in response to said driving tool being placed upon a workpiece, said sensor suited for connection with an energization source for biasing said sensor into said sensor rest position wherein said sensor extends beyond said mouth tool, said sensor having a second abutment portion and a second limiting portion thereon whereby said first abutment portion and said second abutment portion are capable of engagement to prevent pivotal movements of said trigger lever from said trigger rest position to said trigger actuated position if said sensor is in said sensor rest position and said first limiting portion and said second limiting portion capable of engagement to prevent movement of said sensor to said sensor rest position if said trigger lever is in said trigger actuated position, said sensor further having a third abutment portion thereon and said trigger lever further includes a fourth abutment portion thereon, said third abutment portion and said fourth abutment portion co-operating to prevent movements of said sensor from said sensor rest position if said first abutment portion of said trigger lever has engaged said second abutment portion of said sensor due to a partial pivoting movement of said trigger lever.