Patent ID: 7412867

Claim:
A tube-working tool comprising: a body; an actuator trigger hinged to said body for pivoting relative to said body; a support member supporting a working head, said support member comprising a toothed rack and being movably connected to said body; and a drive device mounted on said body and connected to said actuator trigger, said drive device being operable to move said support member relative to said body, said drive device including: a first gearwheel having a first module, and having teeth arranged to mesh with said rack of said support member; a second gearwheel having teeth and a second module smaller than said first module, said second gearwheel being secured to said first gearwheel; a drive pawl operable to engage said second gearwheel so as to advance said rack in a working direction via said first gearwheel; and a retaining pawl operable to engage said second gearwheel so as to prevent said rack from reversing in a direction opposite to the working direction via said first gearwheel; wherein said drive device is operable to move said rack of said support member progressively in the working direction due to pivoting back-and-forth movement of said actuator trigger connected to said drive device.