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US6591878: Method and apparatus for clamping a knife

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Filing Information

Inventor(s) Thomas Charles Hinchliff ·
Assignee(s) Key Knife, Inc. ·
Attorney/Agent(s) Birdwell, Janke & Durando, PLC ·
Primary Examiner W. Donald Bray ·
Application Number US9908918
Filing date 07/18/2001
Issue date 07/15/2003
Prior Publication Data
Predicted expiration date 07/18/2021
U.S. Classifications 144/241  · 241/298  · 144/230  · 241/92  · 144/218  · 407/41  · 407/48  · 407/113  · 144/162.1  ·
International Classifications --
Kind CodeB2
International Classifications 1441621 · 144176 · 144218 · 144230 · 144231 · 144241 · 407 41 · 407 49 · 407102 · 407 31 · 407 32 · 407113 · 241 92 · 2412781 · 241296 · 241298 ·
20 Claims, 5 Drawings


Abstract

A method and apparatus for clamping a knife. A front side of the knife includes a recess and the knife is clamped between an outer clamping member adapted to receive the back side of the knife, and a inner clamping member adapted to receive the front side of the knife, the inner clamping member making contact with the front side of the knife at two spaced locations thereon, wherein at least one of the locations is outside the recess and the other is inside the recess, wherein the width of the recess normalized by the overall width of the knife yields a result that is preferably no more than about 0.22.

Independent Claims | See all claims (20)

  1. 1. A knife for use in a wood chipping apparatus, the knife having an elongate axis, and front and back sides co-terminating in two cutting edges defining an overall width “W” of the knife, wherein said front side includes a recess extending along said elongate axis, wherein the width “wr” of said recess, divided by the width “W,” results in a value that is less than or equal to about 0.31.
  2. 10. A counterknife for a knife used in a wood chipping apparatus, the knife having a front side terminating in at least one cutting edge, the counterknife comprising an outer surface for disposition proximate the front side of the knife, said outer surface having two spaced-apart contact surfaces that are raised in elevation relative to the remainder of said outer surface, said contact surfaces being spaced a maximum of about 0.65″ to 0.75″ apart as measured from corresponding outside edges.
  3. 12. A wood chipping apparatus comprising: a knife having front and back sides co-terminating in two cutting edges for the knife, wherein the distance between the cutting edges defines an overall width of the knife, the knife having a recess in said front side; and a counterknife for receiving and making contact with the front side of the knife at just two spaced locations thereon, wherein at least one of said locations is outside said recess a distance “s,” wherein the ratio “s/W” is less than or equal to about 0.22.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3981337 Sandvik Aktiebolag Sundstrum Sep 1976
US4047670 Aktiebolaget Iggesunds Bruk Svensson Sep 1977
US4271882 VALO ANTTI T Valo Jun 1981
US4850408 Commercial Knife, Inc. Carpenter et al. Jul 1989
US4997018 Commercial Knife, Inc. Carpenter et al. Mar 1991
US5271440 Pacific/Hoe Saw and Knife Company Bradstreet, Jr. et al. Dec 1993
US5819826 Key Knife, Inc. Schmatjen Oct 1998
US5979522 Key Knife, Inc. Swartwood et al. Nov 1999