A pipe cutting apparatus comprising: a hand tool provided with a housing body and a movable handle, the housing body having an arcuate rail, a replacement opening, an axle hole and an axle member, the arcuate rail having a first end, a second end and an inner end Recess, wherein the inner recess is located near the first end, wherein the movable handle is pivotally connected to the housing body; a blade accommodated in the housing body and having a blade axis hole and a control hole, the axis element being pushed through the blade axis hole so as to pivotally locate the blade about the axis hole; a control knob inserted into the arcuate rail, the control knob having a head portion, a rod portion, a blade delimiting portion and a stopper portion, the head portion being outside the arcuate rail and thus exposed, the rod portion being inserted into the arcuate rail, wherein the blade-limiting portion is inserted into the control hole, the stopper portion extending laterally from the rod portion and being located between the head portion and the blade-limiting portion; wherein the control knob, when moved to the first end, can assume an up position and a down position, the stopper portion, when the control knob is in the up position, entering the inner recess and thus from the first end is limited, wherein the blade limiting portion is pulled out of the control hole, wherein the blade, as soon as the axle member from the axis hole and the blade axis hole is pulled out, can be removed for replacement via the exchange opening, wherein the stopper portion, when the control knob in the bottom Position is released from the inner recess, wherein the blade limiting portion is inserted into the control hole and the axle member is inserted into the shaft hole and the blade axis hole, whereby the blade can be fixed in the housing body.
展开▼
