Patent ID: 7275320

Claim:
A tube cutter having a relative movement generating portion comprising: a relative movement generating portion having a manual input portion, a pair of movement output portions, a one-way braking assembly, a connecting portion and a pushing plate, said manual input portion being provided for hand-holding, one of said pair of movement output portions being connected with said connecting portion and the other one of said pair of movement output portions being connected with said pushing plate, said pair of movement output portions selectively moving the push plate toward the connecting portion; a tube cutting base, said tube cutting base being disposed with a set of auxiliary rollers, a receiving space and a pair of guiding slots; a tube cutting slider having a cutting blade corresponding to said auxiliary rollers, a middle blocking portion, a lower blocking portion, a pair of sliding guiders, and a spring; wherein said middle blocking portion has a middle hole, said lower blocking portion has a lower hole, one end of said spring presses on said middle blocking portion and the other end of said spring presses on said pushing plate, wherein said manual input portion and said pair of movement output portions of said relative movement generating portion are disposed on two ends of a pair of pliers, said pair of pliers is pivoted by a central pivoting portion, a resilient element is disposed on said central pivoting portion for opening said manual input portion when an one-way braking condition is removed, an one-way braking assembly is disposed with a releasing element for removing said one-way braking condition.