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US 5,472,027 AGranted
Log bark slitting machine
AssigneeNicholson Manufacturing Company
InventorRobert T. Ackerman
Life of this patent
Estimating the term…
Abstract
A bark slitting machine has swing mounted slitting arms on a rotating ring through which a log is fed. The arms have a swept back outer portion with a cutting edge and an attack angle having a size preferably like that of the lead angle of a helix determined by the path of a point rotating at a given rotational speed about the circumference of a log advancing at a given linear speed.
Claims19
A log bark slitting machine for slitting in a helical path the bark of logs each having a diameter within a given diameter size range, said machine comprising:
- a rotary ring having a central opening therethrough with a center axis for passing an axially moving log in a forward direction;
- and
- a swing arm having an elongated bark cutting edge, said arm being pivotally mounted on said ring such that the arm can swing inwardly into said central opening about a swing axis parallel to said center axis for engagement of said knife with the bark on a said log,
- said cutting edge facing toward said central axis and extending lengthwise from an outer end portion of said swing arm toward said ring,
- and said swing arm being swept rearwardly through at least the length of said cutting edge at an attack angle relative to a plane perpendicular to said central axis, said attack angle having a size approximating that of the lead angle of a helix determined by the path of a point rotating at a given rotational speed about the circumference of a said log advancing axially at a given speed.
2 more elements
A bark slitting tool comprising:
- a swing arm having a boss at one end defining a swing axis,
- a cutter assembly mounted on said arm and presenting an elongated straight cutting edge extending from the opposite end of said arm toward said boss,
- a portion of said arm containing said cutter assembly being bent at an angle relative to a portion of said arm containing said boss such that said cutting edge is parallel to a line intersecting said swing axis at an acute angle.
A bark slitting tool comprising:
- a swing arm having a boss at one end defining a swing axis,
- a cutter mounted on said arm and presenting an elongated straight cutting edge extending from the opposite end of said arm toward said boss,
- a portion of said arm containing said cutter being hinged to swing at an angle relative to a portion of said arm containing said boss.
Dependencies are inferred from the claim text.