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US 4,671,148 AGranted
Trimmer for cylindrical objects
OwnerAlan J. Thatcherinventor
Life of this patent
Estimating the term…
Abstract
A trimmer for making a circumferential cut through a hollow cylindrical object. The trimmer has a rotatably cup which holds a blade support assembly which rotates with the rotatable cup. A cam member is supported by the rotatable cup and rotates in the same direction as a rotatable cup but at a slightly different speed. In one cutting cycle, the cam member rotates one revolution different from the rotatable cup. This causes the blade to move in and out of contact with the object to be cut while the blade is rotating about the periphery of the object.
Claims14
A trimmer for making a circumferential cut through a cylindrical object comprising:
- a support table;
- a rotatable cup supported by said table, said cup having a base and having means for rotating said cup about its axis, said means for rotating being connected to said cup;
- a cam member supported by said rotatable cup and having a hollow shaft, said shaft being axially aligned with the axis of said rotatable cup, said cam portion of said cam member being supported by the base of said cup and being circular and having its center offset from the center of its shaft, said shaft having means for rotating the cam member about the central axis of said shaft in the same direction but at a speed different from that of said rotatable cup;
- a blade support assembly held by the base of said rotatable cup, said blade support assembly having an upper surface and a lower surface and having a cam receiving opening in the bottom thereof and said support assembly having a passageway through said assembly;
- blade means having an upper surface, said blade means being held by said blade support assembly at the upper surface thereof, said blade means extending into the passageway of said blade support assembly;
- and
- means for preventing the rotation of said blade support assembly with respect to said rotatable cup, said means for preventing the rotation of said blade being interconnected between said blade support assembly and said rotatable cup.
4 more elements
A trimmer for making a circumferential cut through a cylindrical object comprising:
- a support table;
- a circular, rotatable cup supported by said table, said cup having a base and having a hollow shaft concentrically positioned at the base thereof, said cup having an opening therethrough coincident with the opening in said hollow shaft, said rotatable cup having means for rotating said cup about its vertical axis, said means for rotating being connected to said cup;
- a cam member supported by said rotatable cup and having a hollow shaft, said shaft being axially aligned and fitting with the hollow shaft of the said rotatable cup, said cam portion of said cam member being supported by the base of said cup and being circular and having its center offset from the center of its shaft, said shaft having means for rotating the cam member about the central axis of said shaft in the same direction but at a speed different from that of said rotatable cup;
- a blade support assembly held by the base of said rotatable cup, said blade support assembly having an upper surface and a lower surface and having a circular cam receiving opening in the bottom thereof, having an inside diameter slightly larger than the outside diameter of the cam and said support assembly having a passageway through said assembly which is larger than the opening in the hollow shaft of the cam member;
- blade means having an upper surface, said blade means being held by said blade support assembly at the upper surface thereof, said blade means extending into the passageway of said blade support assembly;
- an object support plate having an upper surface and a lower surface and having a circular opening therethrough, the plate being supported by said support table so that its lower surface is adjacent the upper surface of said blade means;
- and
- means for preventing the rotation of said blade support assembly with respect to said rotatable cup, said means for preventing the rotation of said blade being interconnected between said blade support assembly and said rotatable cup.
5 more elements
Dependencies are inferred from the claim text.