Patent ID: 7334340

Claim:
A cutting tool for forming a hole in a wall of a plastic lay flat pipe by virtue of a cutting element, capable to penetrate through the wall upon applying a force thereon, the tool comprising: a body portion defined by a rear grasp portion and by a frontal portion, said frontal portion is provided at its lower extremity with a through going vertical passage, said passage is adapted for accommodating the cutting element therein and for guiding the cutting element there-along from an uppermost position to a lowermost position; the frontal portion of the body portion is provided with a mounting pin, said body portion is provided with an upper compartment for deployment therein a pushing member and a spring means; and a pressure handle connected by the mounting pin to the body portion so as to enable pivotal displacement of the pressure handle between an erected position and a depressed position, wherein said pivotal displacement of the pressure handle entails forcible displacement of the cutting element from the uppermost position to the lowermost position or vice versa, wherein said pushing member is connected to the pressure handle and to the cutting element such that the pushing member pushes the cutting element down when the pressure handle is displaced from the erected position to the depressed position or forcibly pulls the cutting element up when the pressure handle is displaced from the depressed position to the erected position, and said pressure handle is provided with an auxiliary mounting pin and said pushing member is provided with a window, wherein said auxiliary pin passed through said window to ensure that the pushing member is forcibly pulled up by the pressure handle when the pressure handle displaces from the depressed position to the erected position.