Abstract Bends and elbows for use in larger size pipe, tube or conduit, such as circular and cylindrical sheet metal duct, for the purpose of installation normally come in several different stock sizes and angles and may be made from a series of sections or gores. The present method of making a section at a preselected angle is to place the pipe or tube from which the section is to be cut in a jig or fixture in proper alignment for rotation about a constant longitudinal axis, and while the pipe or tubing is rotating bring a cutting blade in cutting contact through the wall of the pipe while sustaining said blade in a movable gimbel or mounting corresponding to the angle desired. One form of the present machine comprises a wheeled base having a pipe or tubing jig thereon comprising adjustable arms which adjust radially from a center with end portions that are inserted inside the end of the tubing to hold same to rotate in alignment about a constant longitudinal centerline. A second jig or fixture may be used on the other end of the pipe if desired. An electric motor-driven circular cutting blade with a carbide edge is mounted in a fixed location on a pivotal frame which supports the blade against the wall of the pipe or conduit being cut and the angle of the support of the cutting blade is adjustable from a gear adjustment means. The pipe jig support is rotatably driven to rotate the pipe by means of a large circular gear which rotates the pipe while the cutting blade is making a cut at the desired angle and the cutting blade pivots to cut at an angle on the circular pipe or tubing.
In a method for cutting tube or pipe and the like at a biased angle to the axis thereof, the steps comprising: rotating the pipe to be cut about an axis substantially coincident with the longitudinal centerline of the pipe and simultaneously with said rotation bringing a cutting means into contact with said pipe and directing said cutting means in a path at a biased angle to the axis thereof corresponding to the biased angle cut on said pipe.
Claim 2
Dependent Claim
79 words
In a method for cutting tube or pipe and the like at a biased angle to the axis thereof, the steps comprising: rotating the pipe to be cut about an axis substantially coincident with the longitudinal centerline of the pipe and simultaneously with said rotation bringing a cutting means into contact with said pipe and directing said cutting means in a path at a biased angle to the axis thereof corresponding to the biased angle cut on said pipe.
Claim 3
Dependent Claim
24 words
The method claimed in claim 1: said cutting means including a cutting blade having a cutting edge which is moved in an arcuate path.
Claim 4
Dependent Claim
55 words
The method of claim 2: said cutting blade being circular, said circular cutting blade being shifted about a diametric axis in one direction as said pipe is cut the first 180* of the arc and then said blade being shifted in the opposite direction as the final 180* of arc is cut in said pipe.
Claim 5
Dependent Claim
36 words
The method claimed in claim 1: said cutting means being mounted on a movable cutting frame, the cutting framE being shifted to compensate for the change in direction when said pipe is cut at an angle.
Claim 6
Dependent Claim
34 words
The method of claim in claim 4: said cutting means being a rotating cutting blade having a rotating cutting edge and the shifting of said blade being about a diametric axis of said blade.
Claim 7
Dependent Claim
47 words
The method claimed in claim 1: said cutting means being shifted relative to the longitudinal axis of the pipe being cut when said angular cut on said pipe reaches the maximum in one direction to travel at the angle back to the starting place on the pipe.