Abstract: A pinching tube cutting device to transversely cut a tube made of a plastic material. The device consists of two handles attached to each other in a pivoting movement around an axis wherein one handle contains a cutting blade at its end while the end of the other handle contains a hollow seat to receive the tube. The blade has two sharp edges making a salient angle between 120° and 150°, in such a manner that an angle (&agr;) formed by the sharp edge furthest from the axis and a line passing through the point of the blade and the axis is larger than the angle (&bgr;) formed by the other sharp edge and the line. The point of the blade describes a circular arc which cuts the segment of a line which joins the axis and the center of the tube with the largest diameter possible to rest in the seat.

Abstract: A manual appliance for cutting pipes made of plastic, such as polyethylene, comprising a cutting blade mounted on a blade-holder moving under the action of a control screw between the two parallel branches of a guide saddle closed by means of a completely opening lower saddle.

Abstract: The invention relates to an on-site pipe-cutter assembly which is intended for manual sectioning of rigid, large-diameter pipes located in narrow trenches. The pipe-cutter assembly includes two yokes (1,2) which are connected at their associated ends by tie bars (3) and nuts (4), the yokes including cutter wheels (5) and ratchet sectors (9) arranged at the periphery of the yokes (1,2), the ratchet sectors being concentric with the cutter wheels (5) and a lever (12) having with a forked end which is equipped with two pawls, the pawls making it possible to obtain changes in the angular position of the lever by 10.degree. to 15.degree. or by a multiple of this angle.