JPS6128662Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a pipe cutter for cutting pipes protruding from the floor or wall of a building.

(Prior art) A pipe cutter that is inserted into the open end of a pipe protruding from the floor or wall of a building and cuts it from the inside is equipped with a support member equipped with a horizontal rotating blade at the lower end on a rotating frame body with a handle. However, with conventional pipe cutters of this type, it is difficult to maintain the supporting member parallel to the axis of the pipe during cutting, and the cutting edge of the rotary blade cuts into the inner wall of the pipe. The slope on the upper surface of the rotary blade, which gradually becomes thicker toward the blade base, creates a wedge effect and generates a large force that tries to move the rotary blade downward, and the thin cutting edge of the rotary blade cannot withstand the bending stress caused by this force. It had the defect of breaking.

(Purpose of the invention) The present invention solves the above-mentioned conventional drawbacks, making it easy to maintain the support member parallel to the axis of the pipe during cutting, and preventing the rotary blade from breaking during cutting. It was completed for the purpose of being a reliable pipe cutter.

(Structure of the invention) In the present invention, an elongated support member is installed in a rotating frame body with a handle so that its vertical position can be adjusted freely, and a horizontal rotary blade is provided at the lower end of the support member that can only be displaced downward against a spring. In addition, the support member is characterized in that the upper ends of a pair of parallel ratio links each having a vertical roller at the lower end are pivotally connected to the upper end of the supporting member.

In the figure, 1 is a rotating frame with a handle 2 that is placed on the open end surface of a pipe 50 to be cut and rotated, and 3 is inserted into the rotating frame 1 and its intermediate portion is connected to the rotating frame 1. This is a support member that is attached so that its vertical position can be freely adjusted. The support member 3 has an arc-shaped outer peripheral surface that is in close contact with the inner surface of the rotating frame 1, and a horizontal rotary blade 5 for cutting the inner surface of the pipe supports the rotating shaft on a shaft 4 protruding from the lower end thereof. It is mounted horizontally in line with the longitudinal axis of the member 3. Since the shaft 4 is provided with a rotary blade 5 and a spring 6 that presses upward, the rotary blade 5 is normally located at the upper end of the shaft 4, but when a strong downward force is applied to the rotary blade 5, It can only be displaced downward against the spring 6 while maintaining the horizontal position. A pair of parallel links 8, 8 are pivotally connected to the upper end of the support member 3 with pins 7, 7, and a pair of vertical rollers 10, 10 is pivotally mounted with pins 11,11. These vertical rollers 10, 10 are always maintained parallel to the support member 3 and the axis 4 of the rotary blade 5 by the parallel links 8, 8, so that the cutting edge of the rotary blade 5 corresponds to the middle part of the vertical rollers 10, 10. It is in close contact with the inner surface of the pipe on the opposite side of the rotary blade 5 in terms of height. In addition, a handle 1 is attached to the rotating frame 1.
An adjusting screw 13 with 2 is screwed in, the tip of which passes through an elongated hole 14 transparently provided in the support member 3, and when the handle 12 is rotated by contacting the lower parallel link 8, the adjusting screw 13 is inserted. The parallel link 8 is pushed and pivoted by the tip of the pipe 50, so that the vertical rollers 10, 10 can be moved parallel to the inner diameter of the pipe 50. Note that 15 in the figure indicates the support member 3 inserted into the rotating frame 1.
This is a set bolt for attaching the product to the product so that the vertical position can be adjusted freely.

With this structure, the support member 3 is inserted into the rotary frame 1 and attached to the rotary frame 1 so as to be vertically adjustable.The support member 3 is fixed to the rotary frame 1 with a set bolt 15 in alignment with the cut position of the pipe 50, and then Insert the support member 3 into the inside of the pipe 50 until the lower surface of the rotating frame 1 contacts the end surface of the pipe 50, and tighten the pair of parallel links 8, 8 whose upper ends are pivotally connected to the upper end of the support member 3 with adjustment screws. 13 to pivot according to the inner diameter of the pipe 50, a vertical roller 1 is attached to the lower end of the parallel links 8, 8 parallel to the rotation axis of the rotary blade 5, and whose intermediate portion faces the cutting edge of the rotary blade 5.
0 and 10 come into contact with the inner surface of the pipe on the opposite side of the rotary blade 5, and the rotary blade 5 is strongly pressed against the inner surface of the pipe 50 at the cutting position. Therefore,
By holding the handle 2 and the handle 12 of the rotary frame body 1 with both hands and rotating the rotary frame body 1 on the end surface of the pipe 50 and repeating the tightening operation of the adjustment screw 13, the pipe provided at the lower end of the support member 3 is removed. The rotary blade 5 for cutting the inner surface is attached to a pipe 50 as shown in FIG.
By forming gradually deeper cuts on the inner peripheral surface of the pipe 5.
0, but since the rotary blade 5 is provided at the lower end of the support member 3 so as to be able to move downward as described above, the rotary blade 5 is moved downward by the wedge action of the upper surface of the rotary blade 5. When a large force is generated to force the rotary blade 5 to cut, the rotary blade 5 is displaced downward by a distance of approximately half the thickness of the blade against the spring 6, thereby preventing the blade from being cut. 6, the height of the cut surface will not become unstable since it is always pressed upward. Further, the vertical rollers 10, 10 attached to the lower ends of the parallel links 8, 8 are always kept in close contact with the inner peripheral surface of the pipe 50 during the cutting operation, so that the rotation axis of the support member 3 and the rotary blade 5 is aligned with the inner surface of the pipe 50. Since the cuts are kept parallel to each other, the cuts are always formed on a plane perpendicular to the inner surface of the pipe 50, regardless of the size of the inner diameter of the pipe. Even when used by a person, the starting end and ending end of the cut will not be mismatched, and the pipe can be cut in a plane perpendicular to its axis.

(Effects of the invention) As is clear from the above explanation, the present invention allows pipes protruding from the floor or wall of a building to be easily aligned with the axis of the pipe without causing any mismatch in the cut, even when used by an unskilled person. In addition to being able to cut in a plane perpendicular to the pipe, there is no risk of cutting the cutting edge of the rotary blade when cutting into the inner surface of the pipe, making it practical as it solves the drawbacks of conventional pipe cutters of this type. The value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, FIG. 2 is a partially cutaway front view similarly shown in a state of use, and FIG. 3 is a plan view. 1: Rotating frame body, 2: Handle, 3: Support member,
5: Rotating blade, 6: Spring, 8: Parallel link,
10: Vertical roller.

Claims (1)

[Scope of utility model registration request] An elongated support member 3 is installed in a rotary frame body 1 with a handle 2 so as to be vertically adjustable.
A horizontal rotating blade 5 that can only be displaced downward against a spring 6 is provided at the lower end, and the upper ends of a pair of parallel links 8 each having a vertical roller 10 at the lower end are pivotally connected to the upper end of the support member 3. A pipe cutter that is characterized by: