US 5,261,301 AGranted

Pipe cutting machine

AssigneeEmerson Electric Co.

InventorsLarry F. Babb, Michael P. Gallagher

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Abstract

A portable pipe cutting machine comprises a frame, an arm having opposite ends and supported on the frame for pivotal movement about a pivot axis between the opposite ends, a cutting wheel rotatably mounted on one of the ends of the arm, and a hydraulic piston and cylinder unit between the frame and the other end of the arm for pivoting the arm to displace the cutting wheel toward a pipe to be cut which is supported on rollers mounted on the frame beneath the cutting wheel. A manually operable variable displacement pump delivers fluid under pressure to the piston and cylinder unit to displace the arm toward the pipe, and an electric drive motor unit is supported on the arm for displacement therewith and includes an output end axially slidably interengaged with a drive shaft for the cutting wheel.

Claims34

Dependent claims

A pipe cutting machine comprising a frame, roller means on said frame for supporting a pipe to be cut, arm means for supporting a cutting wheel, said arm means having opposite ends, means supporting said arm means on said frame for pivotal movement about a pivot axis between said opposite ends, one of said ends being above said roller means, a cutting wheel mounted on said one end for rotation about a wheel axis parallel to said pivot axis, means to rotate said cutting wheel, hydraulic piston and cylinder means between said frame and the other of said opposite ends of said arm means for pivoting said arm means about said pivot axis to displace said cutting wheel in the direction toward said roller means, a source of hydraulic fluid, and a manually operable variable displacement pump for delivering fluid under pressure to said piston and cylinder means to displace said arm means in said direction, said pump including a fluid chamber having an inlet connected to said source and an outlet connected to said piston and cylinder means, fluid displacement means in said chamber for pumping fluid from said chamber to said piston and cylinder means, and manually operated means for controlling said fluid displacement means to vary the displacement of fluid from said chamber to said piston and cylinder means.

A pipe cutting machine comprising spaced apart vertical side walls each having a lower portion including a bottom and front rear ends and an upper portion extending upwardly from said lower portion and having an upper end, a plurality of rollers each having a roller axis transverse to said side walls, said rollers being mounted between said front ends of said side walls for supporting a pipe to be cut, cutting wheel supporting arm means between said upper portions of said side walls and mounted thereon for pivotal displacement about a pivot axis transverse to said side walls, said arm means having a first end forwardly of said pivot axis and above said front ends of said side walls and a second end rearwardly of said pivot axis and above said rear ends of said side walls, a cutting wheel on said arm means adjacent said first end thereof and overlying said rollers, means including a drive shaft mounting said cutting wheel on said arm means for rotation about a wheel axis parallel to said pivot axis, said drive shaft including an input end extending axially outwardly of said arm means, a drive motor supported on said arm means for pivotal displacement therewith and having output means in driving interengagement with said input end of said drive shaft, hydraulic piston and cylinder means mounted between said rear ends of said side walls and said second end of said arm means for displacing said arm means about said pivot axis in the direction to displace said cutting wheel toward said rollers, and lever actuated variable displacement piston pump means for delivering hydraulic fluid under pressure to said piston and cylinder means to displace said arm means in said direction.

A pipe cutting machine comprising spaced apart vertical side walls each having a lower portion including a bottom and front and rear ends, and an upper portion extending upwardly from said lower portion and having an upper end, a plurality of rollers each having a roller axis transverse to said side walls, said rollers being mounted between said front ends of said side walls for supporting a pipe to be cut, arm means between said upper portions of said side walls and mounted thereon for pivotal displacement about a pivot axis transverse to said side walls, said arm means having a first end forwardly of said pivot axis and above said front ends of said side walls and a second end rearwardly of said pivot axis and above said rear ends of said side walls, a cutting wheel on said arm means adjacent said first end thereof and overlying said rollers, means including a drive shaft mounting said cutting wheel on said arm means for rotation about a wheel axis parallel to said pivot axis, said drive shaft including an input end extending axially outwardly of said arm means, drive motor means supported on said arm means for pivotal displacement therewith and having output means in driving interengagement with said input end of said drive shaft, hydraulic piston and cylinder means mounted between said rear ends of said side walls and said second end of said arm means for displacing said arm means about said pivot axis in the direction to displace said cutting wheel toward said rollers, and lever actuated variable displacement piston pump means for delivering hydraulic fluid under pressure to said piston and cylinder means to displace said arm means in said direction, said upper portions of said side walls having axially inner sides and said arm means being removably mounted on said upper portions and extending between said inner sides thereof, projection means on said inner sides of said upper portions and extending inwardly therefrom beneath the corresponding side of said arm means to vertically support said arm means during removal and replacement thereof, said arm means being selectively mountable on said upper portions of said side walls in one of a plurality of vertically spaced locations, and said projection means including projection means beneath said arm means in each of said locations.

A pipe cutting machine comprising spaced apart vertical side walls each having a lower portion including a bottom and front and rear ends and an upper portion extending upwardly from said lower portion and having an upper end, a plurality of rollers each having a roller axis transverse to said side walls, said rollers being mounted between said front ends of said side walls for supporting a pipe to be cut, arm means between said upper portion s of said side walls and mounted thereon for pivotal displacement about a pivot axis transverse to said side walls, said arm means having a first end forwardly of said pivot axis and above said front ends of said side walls and a second end rearwardly of said pivot axis and above said rear ends of said side walls, a cutting wheel on said arm means adjacent said first end thereof and overlying said rollers, means including a drive shaft mounting said cutting wheel on said arm means for rotation about a wheel axis parallel to said pivot axis, said drive shaft including an input end extending axially outwardly of said arm means, drive motor means supported on said arm means for pivotal displacement therewith and having output means in driving interengagement with said input end of said drive shaft, hydraulic piston and cylinder means mounted between said rear ends of said side walls and said second end of said arm means for displacing said arm means about said pivot axis in the direction to displace said cutting wheel toward said rollers, and levers actuated variable displacement piston pump means for delivering hydraulic fluid under pressure to said piston and cylinder means to displace said arm means in said direction;

said drive motor means including a housing having opposite ends in the direction between said first and second ends of said arm means, said output means being at one of said ends and axially slidably receiving said input end of said drive shaft, housing support means on said arm means engaging with said housing between said opposite ends thereof to preclude rotation of said housing about said wheel axis, said piston and cylinder means being connected to said second end of said arm means by pin means, and said housing support means including a reaction arm mounted on said second end by said pin means and including a U-shaped portion opening axially outwardly to receive said housing.

A pipe cutting machine comprising spaced apart vertical side walls each having a lower portion including a bottom and front and rear ends and an upper portion extending upwardly from said lower portion and having an upper end, a plurality of rollers each having a roller axis transverse to said side walls, said rollers being mounted between said front ends of said side walls for supporting a pipe to be cut, arm means between said upper portions of said side walls and mounted thereon for pivotal displacement about a pivot axis transverse to said side walls, said arm means having a first end forwardly of said pivot axis and above said front ends of said side walls and a second end rearwardly of said pivot axis and above said rear ends of said side walls, a cutting wheel on said arm means adjacent said first end thereof and overlying said rollers, means including a drive shaft mounting said cutting wheel on said arm means for rotation about a wheel axis parallel to said pivot axis, said drive shaft including an input end extending axially outwardly of said arm means, drive motor means supported on said arm means for pivotal displacement therewith and having output means in driving interengagement with said input end of said drive shaft, hydraulic piston and cylinder means mounted between said rear ends of said side walls and said second end of said arm means for displacing said arm means about said pivot axis in the direction to displace said cutting wheel toward said rollers, and lever actuated variable displacement piston pump means for delivering hydraulic fluid under pressure to said piston and cylinder means to displace said arm means in said direction, said arm means including arm sides at said first ends spaced apart in the direction between said side walls, said cutting wheel being between said arm sides and having axially opposite sides facing said arm sides, means providing shaft receiving openings through said arm sides and through said opposite sides of said cutting wheel, said drive shaft being slidably received in said openings to mount said cutting wheel on said arm means, and guide means between said arm sides and said opposite sides of said cutting wheel for guiding said shaft receiving openings into alignment to receive said drive shaft during a cutting wheel mounting operation.

Dependencies are inferred from the claim text.