Cutlery – Pipe and rod cutters – Rotary
Patent
1992-01-14
1994-02-15
Seidel, Richard K.
Cutlery
Pipe and rod cutters
Rotary
30 93, 30101, B23D 2106, B26D 316
Patent
active
052855767
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a tool for grooving or cutting pipes. It particularly relates to a hand tool capable of dealing with a range of pipe diameters.
International patent application WO86/03439 discloses a pipe cutter formed as a single cylinder having an entry slot. This device suffers from the disadvantage that it is not possible to make a quick, simple and accurate adjustment for a different diameter of pipe.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a new or improved tool for grooving or cutting pipes which overcomes or reduces this disadvantage.
According to this invention, there is provided a tool for treating a pipe, said tool comprising a body having an aperture for receiving a portion of a pipe to be treated, pipe support means displaceably mounted on the body so as to be displaceable to project into the aperture to a variable extent, and a pipe-treating wheel rotatably mounted on the body so that a pipe portion in the aperture is engageable between the pipe-treating wheel and the pipe support means, the pipe-treating wheel being displaceable along a predetermined path relative to the pipe portion such that its operative portion moves inwardly relative to the pipe portion, in which the tool further includes a rotatably mounted cam arranged to adjust the position of the support means.
Thus, the cam may displace the pipe support means to allow different pipes to be treated by the tool of this invention.
Preferably, the cam has a plurality of cam flats arranged at respective predetermined distances from its rotational axis.
Conveniently, the support means comprises two support rollers arranged to define an isosceles triangle with the pipe-treating wheel when the pipe-treating wheel is at an intermediate location on its path, the support rollers being mounted on a block which is displaceable along the axis of symmetry of the triangle.
Desirably, the operative portion of the pipe-treating wheel moves both radially and circumferentially relative to the pipe portion, the path being selected so that, when the tool is rotated relative to the pipe, the pipe-treating wheel is urged against the pipe to effect treatment.
Preferably, the path of the pipe-treating wheel is tangential to an arc of a circle whose centre lies at the centre of the tool.
Conveniently, the pipe-treating wheel is rotationally fixed with an axle pin which is rotatably located in an elongate slot which defines said predetermined path of displacement.
Said elongate slot may be a linear slot.
Alternatively, the body of the tool may be formed in two parts, one part carrying the pipe-treating wheel and the other part carrying the pipe support means, the two parts being hingedly connected together, and the tool further comprising a compression spring arranged to urge the two parts of the tool together.
Preferably, the tool includes means for urging the pipe-treating wheel inwardly along said predetermined path. This is to urge it to contact a pipe. When contact is established, rotation of the tool relative to the pipe urges the pipe-treating wheel against the pipe to effect treatment.
The pipe-treating wheel may be a form roller for forming a groove in the pipe or a cutting wheel for cutting the pipe.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described in greater detail by way of example only, with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a pipe grooving or swaging tool;
FIG. 2 is an axial view of the tool, partly cut away, and showing a different external form;
FIG. 3 is a section view along the line III--III of FIG. 2 showing an adjustment arrangement which does not form part of this invention;
FIG. 4 is a scrap view of parts seen in FIG. 2, but to a larger scale;
FIG. 5 is an axial view of the tool partly cut away and showing an adjustable cam embodying the invention;
FIG. 6 is a side view of the cam shown in FIG. 5;
FIG. 7 is a side view of another embodiment; and
FIG. 8 is a side view of a further em
REFERENCES:
patent: 3216110 (1965-11-01), Stallings
patent: 3335492 (1967-08-01), Spiro
patent: 3651569 (1972-03-01), Arnot
patent: 4078304 (1978-03-01), Netzel
patent: 4103419 (1978-08-01), Mathews et al.
patent: 4769911 (1988-09-01), Araki
patent: 4890385 (1990-01-01), VanderPol et al.
Heyrana, Jr. Paul M.
Seidel Richard K.
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