Claims
- 1. In a chipper knife which includes an elongate knife body bounded on opposite margins by elongate cutting edges lying in a plane and said knife body having a back side and a front side extending between said knife edges,
- a pair of back knife surfaces extending inwardly on the knife body from respective cutting edges and a bearing surface extending between said back knife surfaces forming said back side of the knife, the back knife surfaces being inclined at a common acute angle with respect to a plane bisecting the knife disposed normal to the plane of the cutting edges,
- a pair of front knife surfaces extending inwardly on the knife from respective cutting edges forming the front side of the knife disposed at a common acute angle with respect to respective back knife surfaces, the front knife surfaces joining with an elongate key-retaining channel indented inwardly into the knife body and extending longitudinally of the knife body intermediate said knife edges,
- said back knife surfaces having substantially equal widths and said front surfaces having substantially equal widths and the width of a back knife surface being at least as great as the width of a front knife surface,
- the widths of the front knife surfaces approximately equaling the width of the channel, and the width of the bearing surface approximately equaling the width of a back knife surface.
- 2. The chipper knife of claim 1, wherein each front knife surface includes a relief surface portion joining with a cutting edge and a remaining surface portion forming the majority of the front knife surface joining with the relief surface portion, the relief surface portion of a knife surface inclining inwardly on the knife body progressing toward a knife edge at a slight acute angle relative to the remaining surface portion of the knife surface.
- 3. A chipper knife including an elongate knife body bounded on opposite margins by elongate cutting edges lying in a plane and having a back side extending between the cutting edges and a front side extending between the cutting edges,
- said back side being formed by a pair of back knife surfaces extending inwardly on the knife body from respective cutting edges and inclined at a common acute angle with respect to a plane bisecting the knife disposed normal to the plane of the cutting edges and further being formed by a bearing surface which extends between and joins said back knife surfaces,
- the front side of the knife being formed by a pair of front knife surfaces extending inwardly on the knife from respective cutting edges at a common acute angle with respect to respective back knife surfaces and further being formed by an elongate key-retaining channel indented inwardly into the knife body and extending longitudinally of the knife body intermediate the knife edges,
- the back knife surfaces having substantially equal widths and the front knife surfaces having substantially equal widths, the width of said key-retaining channel approximately equaling the width of a front knife surface and the width of said bearing surface approximately equaling the width of a back knife surface.
- 4. The chipper knife of claim 3, wherein a front knife surface includes a relief surface portion joining with a cutting edge and a remaining surface portion forming the majority of the front knife surface joining with the relief surface portion, the remaining surface portions of the front knife surfaces occupying a common plane and the relief surface portion of the front knife surface inclining inwardly on the knife body at a slight angle from said plane progressing in a direction toward a knife edge.
Parent Case Info
This application is a division of prior filed application entitled "Chipper Disc and Knife Assembly", Ser. No. 07/066,864, filed June 24, 1987, now U.S. Pat. No. 4,771,718, issued Sept. 20, 1988.
US Referenced Citations (12)
Non-Patent Literature Citations (1)
Entry |
1 p. of Drawings of Admitted Prior Art of a Reversible Knife. |
Divisions (1)
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Number |
Date |
Country |
Parent |
66864 |
Jun 1987 |
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