| 摘要 |
The invention relates to a method for manufacturing insulating troughs for pipes, especially pipe bends. According to the method semicircular portions of a pair of concentric cutting blades having radii of curvature corresponding to the outer diameter of the insulating trough and the outer diameter of the pipe respectively, are applied with their cutting edges in a vertical plane against one edge of a board of insulating material, the blades are set in motion in their circumferential direction and advanced through the material of the board along a path corresponding to the desired shape of the insulating trough. An apparatus for carrying out the method is also disclosed.
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