US3356114A - Chipper head and blade - Google Patents

Chipper head and blade Download PDF

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Publication number
US3356114A
US3356114A US3356114DA US3356114A US 3356114 A US3356114 A US 3356114A US 3356114D A US3356114D A US 3356114DA US 3356114 A US3356114 A US 3356114A
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blade
arcuate
recess
body member
chipper
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
    • B27L11/005—Tools therefor

Definitions

  • a rotary body member has a longitudinal recess extending parallel to its rotational axis and provided with an arcuate blade-supporting trailing surface.
  • a keeper is mounted removably in the recess and supports a removable gib having an arcuate surface spaced from and facing the arcuate blade-supporting surface of the recess, forming an arcuate blade-receiving space in which is received a chipper blade having a correspondingly arcuate cross section.
  • the cutting edge of the blade defines the apex of an angle of at least 50 formed by the intersection of a line extending through the rotational axis of the body and a line extending tangential to the leading surface of the blade in the trailing direction of rotation of the body.
  • This invention relates to wood chippers, and more particularly to a chipper head and blade which represents an improvement over the chipper head and blade disclosed in US. Patent No. 2,899,992.
  • Another important object of this invention is the provision of a chipper head and blade assembly which is of simplified construction for economical manufacture, which aifords adjustment with speed and facility and which is of rugged construction for long service life.
  • a further important object of the present invention is the provision of a one piece chipper blade which extends the full length of the supporting head.
  • FIG. 1 is a plan view of a chipper head and blade assembly embodying the features of the present invention
  • FIG. 2 is an end elevation viewed from the right in FIG. 1-,
  • FIG. 3 is a fragmentary sectional view taken on the line 3--3 in FIG. 1;
  • FIG. 4 is a fragmentary sectional view taken on the line 44 in FIG. I.
  • the chipper head comprises a generally cylindrical body having an axial bore for mounting on a power driven shaft 12 for rotation therewith.
  • an inner portion of the bore is tapered to larger diameter at the inner end of the body, for mounting on a correspondingly tapered portion of the driven shaft.
  • the outer portion of the shaft is threaded for reception of the nut 14, by which the body is secured frictionally to the rotary shaft.
  • the chipper head body is contoured to provide for the mounting of at least one chipper blade.
  • provision is made for the mounting of two blades arranged symmetrically with respect to the axis of the body. It is to be understood, of course, that the head may accommodate more than two symmetrically arranged blades, as desired.
  • each blade is achieved by removing a 3,356,114 Patented Dec. 5, 1967 ice longitudinal portion of the body to provide a longitudinal recess adapted to accommodate the mounting of the elongated keeper 16 and gib 18.
  • the rearward side of the keeper is provided with a rearwardly projecting key 20 adapted for sliding engagement in the keyway 22 formed in the body.
  • the keeper is provided with a plurality of longitudinally spaced openings 24 adapted to receive the securing bolts 26 which are threaded into tapped openings provided in the body.
  • the elongated gib 18 is secured to the surface of the keeper trailing the direction of rotation of the head, by means of the attaching bolts 28 which extend through openings 30 in the keeper and are threaded in tapped openings in the gib.
  • the trailing surface 18' of the gib is arcuate in shape, and is spaced from the correspondingly arcuate leading surface 32 of the recess facing the direction of rotation of the head.
  • the arcuate space thus provided receives the correspondingly arcuate elongated chipper blade 34 which is secured firmly therein by tightening of the bolts 26 to draw the gib into firm clamping contact with the blade.
  • the blade is maintained in proper position of adjustment, against the opposing centrifugal force created by rotation of the head, by arranging the arcuate surface 32 such that a radial line drawn from the axis of rotation of the head through the cutting edge of the blade forms with a line drawn tangential to the surface 32 at the periphery of the head an included acute angle B.
  • the blade is positioned on the chipper head body in such manner that a radial line drawn from the axis of rotation of the head to the cutting edge of the blade forms with a line drawn from the cutting edge of the blade tangential to the leading surface of the blade in the trailing direction thereof, an included angle A not substantially less than 50. It is explained in the aforementioned patent that this is an important requirement for the production of wood pulp chips of acceptable quality.
  • the keeper and gib assembly is loosened to allow the blade to be moved outwardly along the arcuate confining space to expose a greater portion of the cutting end of the blade.
  • the keeper and gib assembly then is retightened to secure the blade. After each blade has thus been adjusted outward, the head assembly is rotated and the cutting edges of the blades are sharpened, and jointed if desired.
  • each blade As each blade is moved outwardly for successive resharpening, it may be desirable to fill the space formed between the inner edge of the blade and the associated keeper. This may be accomplished by the insertion of shims 36, as illustrated, or by any other suitable means such as babbit, etc.
  • arcuate blade described hereinbcfore provides the advantage of accommodating a substantial number of resharpenings while maintaining constant the radial distance of rotation and the included angle A throughout the useful life of the blade.
  • the one piece blade construction simplifies considerably the construction of the head and correspondingly minimizes the cost of the latter as well as the blade, while additionally affording resharpening and other maintenance with speed and facility, thereby minimizing down time.
  • a rotary chipper head assembly comprising (a) a body member adapted to be mounted for rotation on its longitudinal axis,
  • the body member having a longitudinal recess extending substantially parallel to its rotational axis, the trailing side of the recess having an arcuate bladesupporting surface extending inward from the outer periphery of the body member,
  • a keeper member mounted removably in the recess of the body member and a gib member mounted removably on the keeper member and having an arcuate surface spaced from and facing the arcuate bladesupporting surface of the recess, forming an arcuate blade-receiving space therebetween, and
  • a rotary chipper head assembly comprising (a) a body member adapted to be mounted for rotation on its longitudinal axis,
  • the body member having a longitudinal recess extending substantially parallel to its rotational axis, the trailing side of the recess having an arcuate bladesupporting surface extending inward from the outer periphery of the body member,
  • blade-securing means mounted removably in the recess of the body member and having an arcuate surface spaced from and facing the arcuate bladesupporting surface of the recess, forming an arcuate blade-receiving space therebetween, and
  • said trailing arcuate surface of the head being arranged such that a radial line from the axis of rotation of the head through the cutting edge of the blade forms with a line tangent to the said arcuate surface at the periphery of the head an included acute angle.
  • a rotary chipper head assembly comprising (a) a body member adapted to be mounted for rotation on its longtiudinal axis,
  • the body member having a longitudinal recess extending substantially parallel to its rotational axis, the trailing side of the recess having an arcuate bladesupporting surface extending inward from the outer periphery of the body member,
  • the keeper member having a longitudinal key portion adapted for reception in the key groove
  • the blade being mounted on the body member with its cutting edge defining the apex of an angle of at least 50 formed by the intersection of a line extending through the rotational axis of the body member and a line extending tangential to the leading surface of the blade in the trailing direction of rotation of the body member.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Description

R. M. NOEL Dec. 5, 1967 CHIPPER HEAD AND BLADE Filed Oct. 13 1965 Roberi" M.N0e1
INVENTOR BY United States Patent 3,356,114 CHIPPER HEAD AND BLADE Robert M. Noel, Sherwood, 0reg., assignor to Key Machinery Designers, Inc., Portland, 0reg., a corporation of Oregon Filed Oct. 13, 1965, Ser. No. 495,465 4 Claims. (Cl. 144172) ABSTRACT OF THE DISCLOSURE A rotary body member has a longitudinal recess extending parallel to its rotational axis and provided with an arcuate blade-supporting trailing surface. A keeper is mounted removably in the recess and supports a removable gib having an arcuate surface spaced from and facing the arcuate blade-supporting surface of the recess, forming an arcuate blade-receiving space in which is received a chipper blade having a correspondingly arcuate cross section. The cutting edge of the blade defines the apex of an angle of at least 50 formed by the intersection of a line extending through the rotational axis of the body and a line extending tangential to the leading surface of the blade in the trailing direction of rotation of the body.
This invention relates to wood chippers, and more particularly to a chipper head and blade which represents an improvement over the chipper head and blade disclosed in US. Patent No. 2,899,992.
It is the principal object of the present invention to provide a chipper head and blade which accommodates periodic sharpening of the blade while maintaining constant radial length of rotation of the cutting edge of the blade and constant operating angle of the blade.
Another important object of this invention is the provision of a chipper head and blade assembly which is of simplified construction for economical manufacture, which aifords adjustment with speed and facility and which is of rugged construction for long service life.
A further important object of the present invention is the provision of a one piece chipper blade which extends the full length of the supporting head.
The foregoing and other objects and advantages of this invention will appear from the following detailed descrip tion, taken in connection with the accompanying drawing in which:
FIG. 1 is a plan view of a chipper head and blade assembly embodying the features of the present invention;
FIG. 2 is an end elevation viewed from the right in FIG. 1-,
FIG. 3 is a fragmentary sectional view taken on the line 3--3 in FIG. 1; and
FIG. 4 is a fragmentary sectional view taken on the line 44 in FIG. I.
In the preferred embodiment illustrated, the chipper head comprises a generally cylindrical body having an axial bore for mounting on a power driven shaft 12 for rotation therewith. In the embodiment illustrated, an inner portion of the bore is tapered to larger diameter at the inner end of the body, for mounting on a correspondingly tapered portion of the driven shaft. The outer portion of the shaft is threaded for reception of the nut 14, by which the body is secured frictionally to the rotary shaft.
The chipper head body is contoured to provide for the mounting of at least one chipper blade. In the preferred embodiment illustrated, provision is made for the mounting of two blades arranged symmetrically with respect to the axis of the body. It is to be understood, of course, that the head may accommodate more than two symmetrically arranged blades, as desired.
The support of each blade is achieved by removing a 3,356,114 Patented Dec. 5, 1967 ice longitudinal portion of the body to provide a longitudinal recess adapted to accommodate the mounting of the elongated keeper 16 and gib 18. The rearward side of the keeper is provided with a rearwardly projecting key 20 adapted for sliding engagement in the keyway 22 formed in the body. The keeper is provided with a plurality of longitudinally spaced openings 24 adapted to receive the securing bolts 26 which are threaded into tapped openings provided in the body.
The elongated gib 18 is secured to the surface of the keeper trailing the direction of rotation of the head, by means of the attaching bolts 28 which extend through openings 30 in the keeper and are threaded in tapped openings in the gib.
The trailing surface 18' of the gib is arcuate in shape, and is spaced from the correspondingly arcuate leading surface 32 of the recess facing the direction of rotation of the head. The arcuate space thus provided receives the correspondingly arcuate elongated chipper blade 34 which is secured firmly therein by tightening of the bolts 26 to draw the gib into firm clamping contact with the blade.
In addition to the clamping pressure provided by the gib, the blade is maintained in proper position of adjustment, against the opposing centrifugal force created by rotation of the head, by arranging the arcuate surface 32 such that a radial line drawn from the axis of rotation of the head through the cutting edge of the blade forms with a line drawn tangential to the surface 32 at the periphery of the head an included acute angle B.
In accordance with the disclosure in the aforementioned Patent No. 2,899,992, the blade is positioned on the chipper head body in such manner that a radial line drawn from the axis of rotation of the head to the cutting edge of the blade forms with a line drawn from the cutting edge of the blade tangential to the leading surface of the blade in the trailing direction thereof, an included angle A not substantially less than 50. It is explained in the aforementioned patent that this is an important requirement for the production of wood pulp chips of acceptable quality.
As the cutting edge of the blade becomes worn and requires resharpening, the keeper and gib assembly is loosened to allow the blade to be moved outwardly along the arcuate confining space to expose a greater portion of the cutting end of the blade. The keeper and gib assembly then is retightened to secure the blade. After each blade has thus been adjusted outward, the head assembly is rotated and the cutting edges of the blades are sharpened, and jointed if desired.
As each blade is moved outwardly for successive resharpening, it may be desirable to fill the space formed between the inner edge of the blade and the associated keeper. This may be accomplished by the insertion of shims 36, as illustrated, or by any other suitable means such as babbit, etc.
It will be apparent that the use of the arcuate blade described hereinbcfore provides the advantage of accommodating a substantial number of resharpenings while maintaining constant the radial distance of rotation and the included angle A throughout the useful life of the blade. The one piece blade construction simplifies considerably the construction of the head and correspondingly minimizes the cost of the latter as well as the blade, while additionally affording resharpening and other maintenance with speed and facility, thereby minimizing down time.
It will be apparent to those skilled in the art that various changes may be made in the number, size and arrangement of parts, as well as other structural details described hereinbefore, without departing from the spirit of this invention and the scope of the appended claims.
Having now described my invention and the manner in which it may be used, What I claim as new and desire to secure by Letters Patent is:
l. A rotary chipper head assembly, comprising (a) a body member adapted to be mounted for rotation on its longitudinal axis,
(b) the body member having a longitudinal recess extending substantially parallel to its rotational axis, the trailing side of the recess having an arcuate bladesupporting surface extending inward from the outer periphery of the body member,
(c) a keeper member mounted removably in the recess of the body member and a gib member mounted removably on the keeper member and having an arcuate surface spaced from and facing the arcuate bladesupporting surface of the recess, forming an arcuate blade-receiving space therebetween, and
(d) a chipper blade having an arcuate cross sectional shape dimensioned for reception in said blade-receiving space.
2. The assembly of claim 1 wherein the body member has a longitudinal key groove communicating with the recess, and the keeper member has a longitudinal key portion adapted for reception in said key groove.
3. A rotary chipper head assembly, comprising (a) a body member adapted to be mounted for rotation on its longitudinal axis,
(b) the body member having a longitudinal recess extending substantially parallel to its rotational axis, the trailing side of the recess having an arcuate bladesupporting surface extending inward from the outer periphery of the body member,
(c) blade-securing means mounted removably in the recess of the body member and having an arcuate surface spaced from and facing the arcuate bladesupporting surface of the recess, forming an arcuate blade-receiving space therebetween, and
(cl) a chipper blade having an arcuate cross sectional shape dimensioned for reception in said blade-receiving space,
(c) said trailing arcuate surface of the head being arranged such that a radial line from the axis of rotation of the head through the cutting edge of the blade forms with a line tangent to the said arcuate surface at the periphery of the head an included acute angle.
4. A rotary chipper head assembly, comprising (a) a body member adapted to be mounted for rotation on its longtiudinal axis,
(b) the body member having a longitudinal recess extending substantially parallel to its rotational axis, the trailing side of the recess having an arcuate bladesupporting surface extending inward from the outer periphery of the body member,
(c) the body member having a longitudinal key groove communicating with the recess,
(d) a keeper member adapted to be mounted removably in the recess of the body member,
(e) the keeper member having a longitudinal key portion adapted for reception in the key groove,
(f) a gib member mounted removably on the keeper member and having an arcuate surface spaced from and facing the arcuate blade-supporting surface of the recess forming an arcuate blade-receiving space therebetwccn, and
(g) an elongated chipper blade having an arcuate cross sectional shape dimensioned for reception in said blade-receiving space,
(h) the blade being mounted on the body member with its cutting edge defining the apex of an angle of at least 50 formed by the intersection of a line extending through the rotational axis of the body member and a line extending tangential to the leading surface of the blade in the trailing direction of rotation of the body member.
References Cited UNITED STATES PATENTS FOREIGN PATENTS 3/1959 France.
WILLIAM W. DYER, JR., Prr'lmzry Examiner. \N. D. BRAY, Assistant Examiner.

Claims (1)

1. A ROTARY CHIPPER HEAD ASSEMBLY, COMPRISING (A) A BODY MEMBER ADAPTED TO BE MOUNTED FOR ROTATION ON ITS LONGITUDINAL AXIS, (B) THE BODY MEMBER HAVING A LONGITUDINAL RECESS EXTENDING SUBSTANTIALLY PARALLEL TO ITS ROTATIONAL AXIS, THE TRAILING SIDE OF THE RECESS HAVING AN ARCUATE BLADESUPPORTING SURFACE EXTENDING INWARD FROM THE OUTER PERIPHERY OF THE BODY MEMBER, (C) A KEEPER MEMBER MOUNTED REMOVABLY IN THE RECESS OF THE BODY MEMBER AND A GIB MEMBER MOUNTED REMOVABLY ON THE KEEPER MEMBER AND HAVING AN ARCUATE SURFACE SPACED FROM AND FACING THE ARCUATE BLADESUPPORTING SURFACE OF THE RECESS, FORMING AN ARCUATE BLADE-RECEIVING SPACE THEREBETWEEN, AND (D) A CHIPPER BLADE HAVING AN ARCUATE CROSS SECTIONAL SHAPE DIMENSIONED FOR RECEPTION IN SAID BLADE-RECEIVING SPACE.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757839A (en) * 1969-12-08 1973-09-11 Nicholson Mfg Co Chipper bit and holder
US3817305A (en) * 1972-10-19 1974-06-18 Ferguson I Cutter tip
EP0023616A1 (en) * 1979-07-18 1981-02-11 Reinhold W. Dr.-Ing. Elsen Throw-away reversible cutting blade for wood chippers
US4298044A (en) * 1980-01-21 1981-11-03 The Filer And Stowell Company Wood chipper
US4667713A (en) * 1986-05-23 1987-05-26 Weyerhaeuser Company Chipper knife assembly
US5111859A (en) * 1990-04-27 1992-05-12 Sunds Defibrator Rauma Woodhandling Oy Chipping method and device
US5143311A (en) * 1990-05-17 1992-09-01 Newman Machine Company, Inc. Wood shavings forming apparatus and cutting roll adapted for use therewith
US5146963A (en) * 1991-11-04 1992-09-15 Commercial Knife, Inc. Chipping device
US5183089A (en) * 1992-01-28 1993-02-02 Weyerhaeuser Company Chipper knife assembly
US20060208120A1 (en) * 2003-02-07 2006-09-21 Mcgehee Ronald Chipper knife

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3757839A (en) * 1969-12-08 1973-09-11 Nicholson Mfg Co Chipper bit and holder
US3817305A (en) * 1972-10-19 1974-06-18 Ferguson I Cutter tip
EP0023616A1 (en) * 1979-07-18 1981-02-11 Reinhold W. Dr.-Ing. Elsen Throw-away reversible cutting blade for wood chippers
US4298044A (en) * 1980-01-21 1981-11-03 The Filer And Stowell Company Wood chipper
US4667713A (en) * 1986-05-23 1987-05-26 Weyerhaeuser Company Chipper knife assembly
US5111859A (en) * 1990-04-27 1992-05-12 Sunds Defibrator Rauma Woodhandling Oy Chipping method and device
US5143311A (en) * 1990-05-17 1992-09-01 Newman Machine Company, Inc. Wood shavings forming apparatus and cutting roll adapted for use therewith
US5146963A (en) * 1991-11-04 1992-09-15 Commercial Knife, Inc. Chipping device
US5183089A (en) * 1992-01-28 1993-02-02 Weyerhaeuser Company Chipper knife assembly
US20060208120A1 (en) * 2003-02-07 2006-09-21 Mcgehee Ronald Chipper knife

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