US3250305A - Wood chipper - Google Patents
Wood chipper Download PDFInfo
- Publication number
- US3250305A US3250305A US341511A US34151164A US3250305A US 3250305 A US3250305 A US 3250305A US 341511 A US341511 A US 341511A US 34151164 A US34151164 A US 34151164A US 3250305 A US3250305 A US 3250305A
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- knife
- supporting member
- wood
- knives
- edges
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- 239000002023 wood Substances 0.000 title claims description 87
- 238000005520 cutting process Methods 0.000 claims description 60
- 230000008093 supporting effect Effects 0.000 claims description 11
- 230000001154 acute effect Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- JJLJMEJHUUYSSY-UHFFFAOYSA-L Copper hydroxide Chemical compound [OH-].[OH-].[Cu+2] JJLJMEJHUUYSSY-UHFFFAOYSA-L 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 210000002816 gill Anatomy 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- 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
- B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
Definitions
- This invention relates to a wood chipper. More particularly, this invention relates to a Wood chipper for cutting logs and other wood pieces into chips for such uses as the manufacture of wood pulp for paper-making and other applications.
- Wood chippers are unable to produce wood chips of consistent length, and in the production of wood chips to be made into paper-making pulp, it is important that wood chips of relatively consistent length be provided.
- Still other wood chippers smear or close the end pores of one or both ends of the wood chips after they have been cut, thereby effectively closing the ends of the wood chips, so as to make it difficult for digesting acids to penetrate the chips.
- wood chippers are not self-feeding, i.e., auxiliary feeding apparatus for feeding the wood pieces to such
- auxiliary feeding apparatus for feeding the wood pieces to such
- some wood wood chippers must be employed. This adds to the cost and complexity of the overall apparatus.
- An important object of this invention is to provide a wood chipper which makes an extremely clean cut and which produces a minimum of oversized chips, sawdust, slivers and fines.
- Another object of this invention is to provide a wood chipper that is self-feeding.
- a further object of this invention is to provide a wood chipper designed so that the cut end of the chip is not wiped, sealed or smeared by the action of the chipper.
- Yet another object of this invention is to provide a wood chipper which is capable of producing wood chips of consistent length, and yet which is such that adjustments may be made in the length of the chips cut at any one time.
- a wood chipper comprising a knife-supporting member and means for rotatably supporting the knife-supporting member.
- the knife-supporting member has first and second side walls which are inclined towards each other so that the side walls define in the knife-supporting member a peripheral groove of generally V-shaped configuration lying in the plane of rotation of the knife-supporting member.
- At least first and second knives, each having a cutting edge, are supported by the knife-supporting membet, and means are provided for rotating'this member 3,250,305 Patented May 10, 1966 and the first and second knives in a first direction.
- the two knives each have parts thereof including the cutting edges which project beyond the first and second side Walls respectively into the generally V-shaped groove.
- the knives are inclined at an obtuse angle to the portions of the first and second side walls adjacent these parts with the cutting edges of the knives leading the knives in the direction of rotation thereof.
- the first and second knives are positioned opposite to each other.
- the cutting edges of the knives each have a leading portion which is positioned remote from the bottom of the generally V-shaped groove and a trailing portion which is positioned nearer to the 'bottom than the leading portion.
- the cutting edges are inclined in the direction of rotation from their trailing portions to their leading portions so that the leading portions lead the trailing portions.
- the knife-supporting member has openings therein adjacent the cutting edges which permit the passage of wood chips cut by the knives through the knife-supporting member.
- a wood-supporting member is provided for supporting wood to be cut into chips by the knives.
- the wood-supporting member has a trough therein which is adapted to receive wood to be cut and has a generally V-shaped end which projects and generally points into the aforementioned V-shaped groove.
- the V-shaped end includes two edges which are inclined towards each other towards the bottom of the trough and also which are inclined at an acute angle to the bottom of the trough.
- the woodsupporting member is positioned such that the knives pass closely adjacent to the edges of the woodsupporting memher during rotation of the knives past these edges, and also such that wood supported in the trough is compressed between the first and second knives and the wood supporting member during cutting of the wood by rotation of the knives.
- FIGURE 1 is a perspective view of a wood chipper embodying this invention with the hood thereof removed;
- FIGURE 2 is a section through the centre of the knifesupporting member of the wood chipper shown in FIG- URE 1, the section being taken in the plane of rotation of the knife-supporting member;
- FIGURE 3 is a top elevation of a part of the wood chipper illustrated in FIGURE 1;
- FIGURE 4 is a section similar to FIGURE 2 but schematic in nature
- FIGURES 5 and 6 are schematic top and front eleva tions respectively of the knife-supporting member of a wood chipper embodying this invention
- FIGURES 7 and 8 are front and side elevations respectively of a wood-supporting member which may be used with a wood chipper embodying this invention.
- FIGURE 9 is a side elevation showing how the woodsupporting member of FIGURES 7 and 8 may be mounted for rotation about the axis of rotation of the knife-supporting member.
- a wood chipper 10 embodying this invention includes a knife-supporting member 11 composed of left and right-hand parts 11a and 11b.
- Each part 11a and 11b has an integral hub 12.
- a shaft 13 passes through openings in hubs 12, and any suitable means (not shown) are employed to fix hubs 12, and hence parts 11a and 11b, to shaft 13, these means not only serving to prevent v 3 parts 11a and 11b from rotating on shaft 13, but also being eifective to hold parts 11a and 11b together with the smooth planar faces 14 thereof in abutment with each other.
- Knife-supporting member 11 could be formed in one piece if desired.
- Knife-supporting member 11 is rotatably supported in bearings 15 and 16 with shaft 13 being journalled in these bearings.
- Bearings 15 and 16 are fastened to rigid frame members 21 and 22 fixed in position relative to each other.
- Any suitable prime mover such as an electric motor 17 is provided to rotate knife-supporting member 11 in the direction shown by the arrow in FIGURE 1, motor 17 having its drive shaft (not shown) coupled to a pulley 18 which drives a pulley 19 through belts 20. It will be understood, of course, that pulley 19 is secured to shaft 13 by any suitable means (not shown). It will be seen from FIGURE 1 that knife-supporting member 11 rotates about a horizontal axis of rotation, or, in other words, that the longitudinal axis of shaft 13 is horizontal, but it should be appreciated that shaft 13 may be placed in different attitudes if desired. I
- Knife-supporting member 11 has side walls 23 and 24 which are inclined towards each other. These side walls define in knife-supporting member 11 a peripheral groove 25 which is of V-shaped configuration and which lies in the plane of rotation of knife-supporting member 11, i.e., perpendicular to the axis of rotation thereof.
- Knife-supporting member 11 is provided with slots or pockets 26 in which are positioned non-radial knives 27 and 28. Knives 27 and 28 are held firmly in pockets 26 by fastening members 60.
- Parts 27a and 28a of knives'27 and 28 respectively which parts include the cutting edges 27b and 28b of knives 27 and 28 respectively, project beyond side walls 23 and 24 respectively into V-shaped groove 25.
- Parts 27a and 28a are inclined at an obtuse angle to the portions of the respective side walls 23 and 24 which are ad jacent and behind these parts in the direction of rotation of knife-supporting member 11.
- Cutting edges 27b and 28b lead knives 27 and 28 respectively in the direction of rotation of knife-supporting member 11.
- Cutting edges 27b and 28b each have a leading portion 29 remote from the bottom of groove 25 and a trailing portion 30 adjacent-the bottom of groove 25.
- the knives are abuttedadjacent the bottom of groove 25 at their trailing portion 30.
- Cutting edges 27b and 28b are inclined towards rather than against the direction of rotation of knife-supporting member 11 from their trailing portions to their leading portions, so that the leading portions lead the trailing portions. This is best shown in FIG- URES 4 and 6.
- FIGURE 4 when either cutting edge is viewed such that it is bisected by a plane passing through the axis of rotation of knife-supporting member 11, the plane angle 32 between the cutting edge and this plane, i.e., the angle between the cutting edge and this plane when projected onto a plane at right angles to the aforementioned plane and perpendicular to the direction of viewing, in other words, in the case of FIGURE 4, the angle 32 in the plane ofthe paper, is an acute angle, and leading portions 29 are positioned ahead of trailing portions 30 in the direction of rotation of knife-supporting member 11.
- Knives 27 and 28 are positioned opposite each other and are symmetrically located on either side of the plane of rotation of knife-supporting member 11 passing through the bottom of groove 25.
- two sets of knives 27 and 28 spaced 180 apart are provided (see FIGURES 2 and 3).
- One set of knives or more than two sets of knives, preferably equally spaced apart, can be employed however.
- Knife-supporting member 11 has openings 33 therein positioned beneath blades 27 and 28. These openings permit the passage of wood chips through knife-supporting member 11. The wood chips tumble out the open ends 34 of knife-supporting member 11 and fall into any suitable collecting or conveying device (not shown). Since knife-supporting member 11 is rotating at a high speed, a cover or hood with a hinged door 101 (FIG- URE 9) should be provided over the apparatus to protect the operator and to deflect wood chips which spin out of open ends 34 towards the cover.
- While knives.27 and 28 are held firmly in' position in knife-supporting member 11 by fastening members 60, these members may be loosened to permit adjustments to be made in the extent that cutting edges 27b and 28b project into groove 25, which permits the length of the chips cut by the apparatus to be varied. It is desirable, however, that cutting edges 2% and 285 be kept a uniform distance from side walls 23 and 24 respectively throughout the lengths of the cutting edges.
- both the knife-supporting member and the sets of knives 27 and 28 are symmetrical about the plane of rotation of knife-supporting member 11 through the bottom of groove 25.
- angle 35 (FIGURE 5) between side walls 23 and 24 is not critical, it must be less than of course. The more closely this angle approaches 180, the less clean is the cut which is produced for a given wood species having the same wood characteristics. Furthermore, angles close to 180 could cause the production of undesirable oversized chips, sawdust and slivers, particularly with eastern North American woods. In addition, because of the nature of the cut made under such circumstances, greater power is required to drive the wood chipper. Experience has shown that an angle 35 of 90 is most suitable.
- plane angle 31 must be less than 180 so as to insure that leading portions 29 actually lead trailing portions 30 for reasons which will become more apparent hereinafter.
- Wood-supporting member 36 comprises a trough 38 in which a log 39 to be cut into chips is supported.
- Trough 38 has side Walls 40 and 41 which are inclined towards each other towards the bottom 46 of the trough, the bottom of the trough preferably being rounded.
- Trough 38 has a V-shaped end 42 which projects and points into groove 25 and terminates therein at a point 43.
- End 42 comprises two edges 44 and 45 which are inclined towards each other at'a variable angle towards bottom 46 of trough 38, and which are inclined at a variable acute angle to bottom 46.
- Edges 44 and 45 preferably constitute sharp knife edges or bedknives.
- bottom 46 of trough 38 is horizontal. This is not essential, but is, of course, a requirement for a horizontal feed.
- wood-supporting member 36 may be mounted in such a manner that it may be rotated around the axis of rotation of knife-supporting member 11 and fixed at any angle between the horizontal and the vertical.
- wood-supporting member 36 may be fixed to a crossbar 102 which is fixed to hood 100.
- Hood 100 has tracks 103 which are circular and which ride in supports 104.
- the centre of curvature of tracks 103 is the axis of rotation of shaft 13.
- door 101 is hinged at 106 and has a hooded port 107 therein into which wood pieces 39 may be fed in alignment with trough 38, it being understood, of course, that a part of the front face of cover 100 in alignment with and below port 107 also is open.
- variable plane angle between edges 44 and 45 seen when looking at right angles to a plane passing through these edges, and the variable plane angle between either edge 44 or 45 and bottom 46 projected into the plane of rotation of knife-supporting member 11 and viewed perpendicular to this plane, are determined by such factors as (a) the placement of trough 38 relative to knife-supporting member 11, (b) the magnitude of angle and plane angle 31, (c) the diameter of knifesupporting member 11, (d) the angle between sides and 41, and (e) the requirement that cutting edges 27b and 28b should pass closely adjacent to edges and 44 respectively during rotation of the knives past these edges 44 and 45 to provide a scissors-like shearing action.
- edges 44 and 45 preferably should not be straight.
- edges 44 and 45 are dished inwardly towards each other, and, as shown in FIGURES 2 and 8, also are dished in a curve which opens away from the trough.
- edges 44 and 45 could be made straight, it will be appreciated that by doing so the clearance between cutting edges 27b and 28b andedges 45 and 44 respectively will not remain constant as knives 27 and 28 travel past edges 45 and 44.
- sides 40 and 41 be at approximately to each other, and that bottom 46 of trough 38 be radiused to correspond in curvature to the smallest log likely to be processed, but these requirements are not critical.
- An angle between sides 40 and 41. substantially greater than 120 tends to minimize the self-centering action. of the trough on a log 39, while angles substantially less than 120 tend to result in the lifting of logs of large diameter higher than is desirable with consequent in trough 38 with the fiat end of the log butted against side walls 23 and 24. Knives 27 and 28 descend upon log 39 and initially engage the same at a point below the axis of rotation of the knife-supporting member.
- Cutting edges 27b and 28b simultaneously make initial contact with log 39 in such a manner that each knife attacks the log at an angle to the grain thereof of less than 45 As the cuttting edges cut through the log, this angle progressively decreases until, at the cut-off point, knives 27 and 28 are moving in a direction substantially parallel to the wood grain. Under these conditions, the vertically acting knife pressures required when the log is initially engaged by the knives are accommodated by the full depth of the log, which acts as an anvil at the beginning of the cutting action. As the depth of the portion of the log which is uncut decreases, vertical knife pressures give Way to horizontal knife pressures.
- a wood chipper comprising a knife-supporting member, means for rotatably supporting said knife-supporting member, said knife-supporting member having first and second side walls inclined towards each other, said side Walls defining in said knife-supporting member a peripheral groove of generally V-shaped configuration lying in the plane of rotation of said knife-supporting member, at least first and second knives each having a cutting edge and each being supported by said knife-supporting member, means for rotating said knife-supporting member and said first and second knives in a first direction, said first knife having a part thereof including said cutting edge of said first knife projecting beyond said first side wall into said generally V-shaped groove, said part of said first knife being inclined at an obtuse angle to a portion of said first side wall adjacent said part of said first knife with said cutting edge of said first knife leading said first knife in said first direction of rotation of said first knife, said second knife having a part thereof including said cutting edge of said second knife projecting beyond said second side Wall into said' generally V-shaped groove, said part of said second knife being inclined at
- a wood chipper according to claim 1 wherein at least said cutting edges of said knives abut against each other adjacent said bottom of said generally V-shaped groove.
- a wood chipper according to claim 1 wherein said cutting edges of said first and second knives each project a constant distance beyond said first andsecond side gills respectively throughout the lengths of said cutting e ges.
- a 'wood chipper according to claim 1 including means for adjusting the position of said first and second knives with respect to said knife-supporting member.
- a wood chipper according to claim 1 wherein the plane angle between said cutting edges is substantially 152.
- a wood chipper according to claim 1 wherein said edges of said wood-supporting member are dished in- Wardly towards each other and also are curved in curves opening away from said trough.
- a wood chipper according to claim 1 including means supporting said wood-supporting member for rotation about said knife-supporting member.
- a wood chipper according to claim 3 wherein at least said cutting edges of said knives abut against each other adjacent saidv bottom of said'generally V-shaped groove, wherein said cutting edges of said first and second knives-each project a constant distance beyond said first and second side walls respectively throughout the lengths of said cutting edges, and wherein said edges of said woodsupporting member are knife edges.
- a wood chipper comprising a knife-supporting member, means for rotatably supporting said knifesupporting member about a horizontal axis of rotation, said knife-supporting member having first. and second side having a part thereof including said cutting edge of said first knife projecting beyond said first side wall into said generally V-shaped groove, said part of said first knife being inclined at an obtuse angle to a portion of said first side wall adjacent said part of said first knife with said cutting edge of said first knife leading said first knife in said first direction of rotation of said first knife, said second knife having a part thereof including said cutting edge of said second knife projecting beyond said second side wall into said generally V-shaped groove, said part of said second knife being inclined at an obtuse angle to a portion of said second side wall adjacent said part of said second knife with said cutting edge of said second knife leading said second knife in said first direction of rotation of said second knife, said first and second knives being positioned opposite to each other, said cutting edges of said knives each having a leading portion positioned remote from the bot-tom of said generally
- W. D. BRAY Assistant Examiner.
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- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Debarking, Splitting, And Disintegration Of Timber (AREA)
Description
y 0, 1966 J. R. DUNBAR 3,250,305
WOOD GHIPPER Filed Jan. 31, 1964 4 Sheets-Sheet 1 INVENTOR. Wm! 2x84? zz r5 Attorne y y 0. 1966 .J. R. DUNBAR 3,250,305
WOOD CHIPPER Filed Jan. 31, 1964 4 Sheets-Sheet 2 INVENTOR. $4M: 241m Y Attorne y May 10, 1966 Filed Jan. 51, 1964 J. R. DUNBAR 3,250,305
WOOD CHIPPER 4 Sheets-Sheet 3 ZNVENTOR Marts 210344 Attorney J. R. DUNBAR WOOD CHIPPER May 10,, 1966 4 Sheets-Sheet 4.
Filed Jan. 31, 1964 FIG. 8
FIG. 7
INVENTOR. 5 405: 24/144 BY Attorney FIG. 9
United States Patent 3,250,305 WOOD CHIPPER James Robert Dunbar, North Delta, British Columbia, Canada, assignor to Cargate Westminster Industries Limited, New Westminster, British Columbia, Canada Filed Jan, 31, 1964, Ser. No. 341,511 18 Claims. (Cl. 144172) This invention relates to a wood chipper. More particularly, this invention relates to a Wood chipper for cutting logs and other wood pieces into chips for such uses as the manufacture of wood pulp for paper-making and other applications.
Prior art types of wood chippers suifer from a number of inherent disadvantages. chippers produce oversized chips, sawdust and fines during operation because of their inability to make a clean cut, and these undesirable materials subsequently must be screened out. Thus, on the one hand, some wood chipper-s fail to out completely through the wood pieces, and parts of the wood pieces are broken or torn off, resulting in the production of sawdust and slivers. Furthermore, the breaking or tearing effect so produced increases the horsepower required to operate these wood chippers beyond that which should be necessary. On the other hand, many wood chippers produce a crushing rather than a shearing action resulting in the production of oversized chips, sawdust and fines and increasing the horsepower requirements of such wood chippers beyond that which would be required if a clean out were made.
Many Wood chippers are unable to produce wood chips of consistent length, and in the production of wood chips to be made into paper-making pulp, it is important that wood chips of relatively consistent length be provided.
Still other wood chippers smear or close the end pores of one or both ends of the wood chips after they have been cut, thereby effectively closing the ends of the wood chips, so as to make it difficult for digesting acids to penetrate the chips.
Many wood chippers are not self-feeding, i.e., auxiliary feeding apparatus for feeding the wood pieces to such For example, some wood wood chippers must be employed. This adds to the cost and complexity of the overall apparatus.
An important object of this invention is to provide a wood chipper which makes an extremely clean cut and which produces a minimum of oversized chips, sawdust, slivers and fines.
Another object of this invention is to provide a wood chipper that is self-feeding.
A further object of this invention is to provide a wood chipper designed so that the cut end of the chip is not wiped, sealed or smeared by the action of the chipper.
Yet another object of this invention is to provide a wood chipper which is capable of producing wood chips of consistent length, and yet which is such that adjustments may be made in the length of the chips cut at any one time.
In accordance with this invention there is provided a wood chipper comprising a knife-supporting member and means for rotatably supporting the knife-supporting member. The knife-supporting member has first and second side walls which are inclined towards each other so that the side walls define in the knife-supporting member a peripheral groove of generally V-shaped configuration lying in the plane of rotation of the knife-supporting member. At least first and second knives, each having a cutting edge, are supported by the knife-supporting membet, and means are provided for rotating'this member 3,250,305 Patented May 10, 1966 and the first and second knives in a first direction. The two knives each have parts thereof including the cutting edges which project beyond the first and second side Walls respectively into the generally V-shaped groove. These parts of the knives are inclined at an obtuse angle to the portions of the first and second side walls adjacent these parts with the cutting edges of the knives leading the knives in the direction of rotation thereof. The first and second knives are positioned opposite to each other. The cutting edges of the knives each have a leading portion which is positioned remote from the bottom of the generally V-shaped groove and a trailing portion which is positioned nearer to the 'bottom than the leading portion. The cutting edges are inclined in the direction of rotation from their trailing portions to their leading portions so that the leading portions lead the trailing portions. The knife-supporting member has openings therein adjacent the cutting edges which permit the passage of wood chips cut by the knives through the knife-supporting member. A wood-supporting member is provided for supporting wood to be cut into chips by the knives. The wood-supporting member has a trough therein which is adapted to receive wood to be cut and has a generally V-shaped end which projects and generally points into the aforementioned V-shaped groove. The V-shaped end includes two edges which are inclined towards each other towards the bottom of the trough and also which are inclined at an acute angle to the bottom of the trough. The woodsupporting member is positioned such that the knives pass closely adjacent to the edges of the woodsupporting memher during rotation of the knives past these edges, and also such that wood supported in the trough is compressed between the first and second knives and the wood supporting member during cutting of the wood by rotation of the knives.
This invention will become more apparent from the following detailed description, taken in conjunction with the appended drawings, in which: 1
FIGURE 1 is a perspective view of a wood chipper embodying this invention with the hood thereof removed;
FIGURE 2 is a section through the centre of the knifesupporting member of the wood chipper shown in FIG- URE 1, the section being taken in the plane of rotation of the knife-supporting member;
FIGURE 3 is a top elevation of a part of the wood chipper illustrated in FIGURE 1;
FIGURE 4 is a section similar to FIGURE 2 but schematic in nature;
FIGURES 5 and 6 are schematic top and front eleva tions respectively of the knife-supporting member of a wood chipper embodying this invention;
FIGURES 7 and 8 are front and side elevations respectively of a wood-supporting member which may be used with a wood chipper embodying this invention; and
FIGURE 9 is a side elevation showing how the woodsupporting member of FIGURES 7 and 8 may be mounted for rotation about the axis of rotation of the knife-supporting member.
Referring to the drawings, and, in particular, to FIG- URES 1-3, a wood chipper 10 embodying this invention includes a knife-supporting member 11 composed of left and right- hand parts 11a and 11b. Each part 11a and 11b has an integral hub 12. A shaft 13 passes through openings in hubs 12, and any suitable means (not shown) are employed to fix hubs 12, and hence parts 11a and 11b, to shaft 13, these means not only serving to prevent v 3 parts 11a and 11b from rotating on shaft 13, but also being eifective to hold parts 11a and 11b together with the smooth planar faces 14 thereof in abutment with each other. Knife-supporting member 11 could be formed in one piece if desired.
Knife-supporting member 11 is rotatably supported in bearings 15 and 16 with shaft 13 being journalled in these bearings. Bearings 15 and 16 are fastened to rigid frame members 21 and 22 fixed in position relative to each other.
Any suitable prime mover such as an electric motor 17 is provided to rotate knife-supporting member 11 in the direction shown by the arrow in FIGURE 1, motor 17 having its drive shaft (not shown) coupled to a pulley 18 which drives a pulley 19 through belts 20. It will be understood, of course, that pulley 19 is secured to shaft 13 by any suitable means (not shown). It will be seen from FIGURE 1 that knife-supporting member 11 rotates about a horizontal axis of rotation, or, in other words, that the longitudinal axis of shaft 13 is horizontal, but it should be appreciated that shaft 13 may be placed in different attitudes if desired. I
Knife-supporting member 11 has side walls 23 and 24 which are inclined towards each other. These side walls define in knife-supporting member 11 a peripheral groove 25 which is of V-shaped configuration and which lies in the plane of rotation of knife-supporting member 11, i.e., perpendicular to the axis of rotation thereof.
Knife-supporting member 11 is provided with slots or pockets 26 in which are positioned non-radial knives 27 and 28. Knives 27 and 28 are held firmly in pockets 26 by fastening members 60.
Cutting edges 27b and 28b each have a leading portion 29 remote from the bottom of groove 25 and a trailing portion 30 adjacent-the bottom of groove 25. The knives are abuttedadjacent the bottom of groove 25 at their trailing portion 30. Cutting edges 27b and 28b are inclined towards rather than against the direction of rotation of knife-supporting member 11 from their trailing portions to their leading portions, so that the leading portions lead the trailing portions. This is best shown in FIG- URES 4 and 6. Referring to FIGURE 6, when cutting edges 27b and 28b are viewed such that they are bisected by a plane passing through the axis of rotation of knifesupporting member 11, the plane angle 31 between the cutting edges, i.e., the angle between cutting edges 27b and 28b when projected onto a plane perpendicular to the aforementioned plane and at right angles to the direction of viewing, in other words, in the case of FIGURE 6, the angle 31 in the plane of the paper, is less than 180, and leading portions 29 are positioned ahead of trailing portions 30 in the direction of rotation of knife-supporting member 11. Similarly, in FIGURE 4 when either cutting edge is viewed such that it is bisected by a plane passing through the axis of rotation of knife-supporting member 11, the plane angle 32 between the cutting edge and this plane, i.e., the angle between the cutting edge and this plane when projected onto a plane at right angles to the aforementioned plane and perpendicular to the direction of viewing, in other words, in the case of FIGURE 4, the angle 32 in the plane ofthe paper, is an acute angle, and leading portions 29 are positioned ahead of trailing portions 30 in the direction of rotation of knife-supporting member 11.
In the embodiment of the invention illustrated two sets of knives 27 and 28 spaced 180 apart are provided (see FIGURES 2 and 3). One set of knives or more than two sets of knives, preferably equally spaced apart, can be employed however.
Knife-supporting member 11 has openings 33 therein positioned beneath blades 27 and 28. These openings permit the passage of wood chips through knife-supporting member 11. The wood chips tumble out the open ends 34 of knife-supporting member 11 and fall into any suitable collecting or conveying device (not shown). Since knife-supporting member 11 is rotating at a high speed, a cover or hood with a hinged door 101 (FIG- URE 9) should be provided over the apparatus to protect the operator and to deflect wood chips which spin out of open ends 34 towards the cover.
While knives.27 and 28 are held firmly in' position in knife-supporting member 11 by fastening members 60, these members may be loosened to permit adjustments to be made in the extent that cutting edges 27b and 28b project into groove 25, which permits the length of the chips cut by the apparatus to be varied. It is desirable, however, that cutting edges 2% and 285 be kept a uniform distance from side walls 23 and 24 respectively throughout the lengths of the cutting edges.
It will be noted from the foregoing description that both the knife-supporting member and the sets of knives 27 and 28 are symmetrical about the plane of rotation of knife-supporting member 11 through the bottom of groove 25.
While the angle 35 (FIGURE 5) between side walls 23 and 24 is not critical, it must be less than of course. The more closely this angle approaches 180, the less clean is the cut which is produced for a given wood species having the same wood characteristics. Furthermore, angles close to 180 could cause the production of undesirable oversized chips, sawdust and slivers, particularly with eastern North American woods. In addition, because of the nature of the cut made under such circumstances, greater power is required to drive the wood chipper. Experience has shown that an angle 35 of 90 is most suitable.
While plane angles 32 and 31 are not critical, plane angle 31 must be less than 180 so as to insure that leading portions 29 actually lead trailing portions 30 for reasons which will become more apparent hereinafter.
Experience has shown that a plane angle 31 of 152 is suitable, and this necessarily requires a plane angle 32 As shown in FIGURES l-3, a wood-supporting member 36 is provided. Wood-supporting member 36 comprises a trough 38 in which a log 39 to be cut into chips is supported. Trough 38 has side Walls 40 and 41 which are inclined towards each other towards the bottom 46 of the trough, the bottom of the trough preferably being rounded. Trough 38 has a V-shaped end 42 which projects and points into groove 25 and terminates therein at a point 43. End 42 comprises two edges 44 and 45 which are inclined towards each other at'a variable angle towards bottom 46 of trough 38, and which are inclined at a variable acute angle to bottom 46. Edges 44 and 45 preferably constitute sharp knife edges or bedknives.
It will be seen from the drawings that bottom 46 of trough 38 is horizontal. This is not essential, but is, of course, a requirement for a horizontal feed. In the event that it is desirable to feed logs into the chipper at an angle up to 90 from the horizontal, so that the weight of the log is used to assist in the feed thereof, or for any other reason, wood-supporting member 36 may be mounted in such a manner that it may be rotated around the axis of rotation of knife-supporting member 11 and fixed at any angle between the horizontal and the vertical.
Thus, as shown in FIGURE 9, wood-supporting member 36 may be fixed to a crossbar 102 which is fixed to hood 100. Hood 100 has tracks 103 which are circular and which ride in supports 104. The centre of curvature of tracks 103 is the axis of rotation of shaft 13. By loosening fastening devices 105 in supports 104 tracks 103 are released so that hood 100 and wood-supporting member 36 may be rotated about shaft 13. When the desired orientation of wood-supporting member 36 is reached, fastening devices 105 are again secured.
As shown in FIGURE 9, door 101 is hinged at 106 and has a hooded port 107 therein into which wood pieces 39 may be fed in alignment with trough 38, it being understood, of course, that a part of the front face of cover 100 in alignment with and below port 107 also is open.
It is desirable that the bottom of log 39 at the end thereof to be chipped be maintained above the lowermost point that is reached by the point of intersection of trailing portions during a complete rotation of the knives 27 and 28. This is ensured in the apparatus shown by making point 43 higher than the lowest elevation of the bottom of groove 25 which is at point 49 (FIGURE 2). It also is desirable that log 39 not be so great in diameter as to extend appreciably above the axis of rotation of knife-supporting member 11 when log 39 is horizontal.
The variable plane angle between edges 44 and 45 seen when looking at right angles to a plane passing through these edges, and the variable plane angle between either edge 44 or 45 and bottom 46 projected into the plane of rotation of knife-supporting member 11 and viewed perpendicular to this plane, are determined by such factors as (a) the placement of trough 38 relative to knife-supporting member 11, (b) the magnitude of angle and plane angle 31, (c) the diameter of knifesupporting member 11, (d) the angle between sides and 41, and (e) the requirement that cutting edges 27b and 28b should pass closely adjacent to edges and 44 respectively during rotation of the knives past these edges 44 and 45 to provide a scissors-like shearing action. In connection with requirement (c), it will be noted that the cuts or faces made by the knives are not planar and are dished slightly inwardly. Because of the nature of the contour of the cutting path described by cutting edges 27b and 28b, in order to maintain a constant clearance between edges 44 and 45 and their cooperating cutting edges 28b and 2712 respectively during the movement of knives 27 and 28 past edges45 and 44, edges 44 and 45 preferably should not be straight. Thus, as shown in FIGURE 3, edges 44 and 45 are dished inwardly towards each other, and, as shown in FIGURES 2 and 8, also are dished in a curve which opens away from the trough. While edges 44 and 45 could be made straight, it will be appreciated that by doing so the clearance between cutting edges 27b and 28b andedges 45 and 44 respectively will not remain constant as knives 27 and 28 travel past edges 45 and 44. I It is preferred that sides 40 and 41 be at approximately to each other, and that bottom 46 of trough 38 be radiused to correspond in curvature to the smallest log likely to be processed, but these requirements are not critical. An angle between sides 40 and 41. substantially greater than 120 tends to minimize the self-centering action. of the trough on a log 39, while angles substantially less than 120 tend to result in the lifting of logs of large diameter higher than is desirable with consequent in trough 38 with the fiat end of the log butted against side walls 23 and 24. Knives 27 and 28 descend upon log 39 and initially engage the same at a point below the axis of rotation of the knife-supporting member.
Cutting edges 27b and 28b simultaneously make initial contact with log 39 in such a manner that each knife attacks the log at an angle to the grain thereof of less than 45 As the cuttting edges cut through the log, this angle progressively decreases until, at the cut-off point, knives 27 and 28 are moving in a direction substantially parallel to the wood grain. Under these conditions, the vertically acting knife pressures required when the log is initially engaged by the knives are accommodated by the full depth of the log, which acts as an anvil at the beginning of the cutting action. As the depth of the portion of the log which is uncut decreases, vertical knife pressures give Way to horizontal knife pressures. The nearly horizontally acting knife pressures towards the end of the'cut ensure that the bottom fibres of the log are sliced off cleanly in the absence of vertical pressures, and that the log is drawn towards knife-supporting member 11 in a self-feeding action. During cutting, log 39 is prevented from rolling or turning by virtue of the fact that it is in trough 38, and on account of plane angle 31 being less than 180, which causes knives 27 and 28 to create a wedging effect with respect to log 39.
After the cut has been completed, the log 39 will have moved forward to the position shown in FIGURE 1. In this position, where the sharp, freshly cut edge of the end of the log abuts the bottom of groove 25, it is important to note that faces 50 are not wiped by side Walls 23 and 24, so that sealing of the faces 50 after cutting is avoided. It is also important to note that, since trailing portions 30 abut each other, the whole end of log 39 is cut and there is no breaking or tearing action.
Since after each cut log 39 has been pulled forwardly in trough 38 to the same extent, chips of consistent length are cut. These chips pass through openings 33, out open. ends 34 and are collected as aforementioned.
While preferred embodiments of this invention have been described herein, those skilled in the art will appreciate that changes and modifications may be made therein without departing from the spirit and scope of this invention as defined in the appended claims.
What I claim as my invention is:
1. A wood chipper comprising a knife-supporting member, means for rotatably supporting said knife-supporting member, said knife-supporting member having first and second side walls inclined towards each other, said side Walls defining in said knife-supporting member a peripheral groove of generally V-shaped configuration lying in the plane of rotation of said knife-supporting member, at least first and second knives each having a cutting edge and each being supported by said knife-supporting member, means for rotating said knife-supporting member and said first and second knives in a first direction, said first knife having a part thereof including said cutting edge of said first knife projecting beyond said first side wall into said generally V-shaped groove, said part of said first knife being inclined at an obtuse angle to a portion of said first side wall adjacent said part of said first knife with said cutting edge of said first knife leading said first knife in said first direction of rotation of said first knife, said second knife having a part thereof including said cutting edge of said second knife projecting beyond said second side Wall into said' generally V-shaped groove, said part of said second knife being inclined at an obtuse angle to a portion of said second side wall adjacent said part of said second knife with said cutting edge of said second knife leading said second knife in said first direction of rotation of said second knife, said first and second knives being positioned opposite to each other, said cutting edges of said knives each having a leading portion positioned remote from the bottom of said generally V-shaped groove and .a trailing portion positioned nearer to said bottom than said leading portion, said cutting edges being inclined in said first direction .of rotation from said trailing portions to said leading portions, whereby said leading portions lead said trailing portions, said knife-supporting member having openings therein adjacent said cutting edges and adapted to permit passage of wood chips cut by said' knives through said knife-supporting member, and a Wood-supporting member for supporting wood to be cut into chips by said knives, said wood-supporting member having a trough therein adapted to receive wood to be cut, said wood-supporting member having a generally V- shaped end projecting and generally pointing into said generally V-shaped groove'in said knife-supporting member, said generally V-shaped end including two edges inclined towards each other towards the bottom of said trough and inclined at an acute angle to said bottom of said trough, said edges of said wood-supporting member being positioned with respect to said first'and second knives such that said first and second knives pass closely adjacent to said edges of said Wood-supporting member during rotation of said first and second knives in said first direction and past said edges of said wood-supporting member, said wood-supporting member being positioned such that wood supported thereby is compressed between said first and second knives and said wood-supporting member during cutting of said wood by rotation of said knives in said first direction.
2. A wood chipper according to claim 1 wherein said first and second knives are symmetrically positioned about a plane passing through said bottom of said generally V-shaped groove.
3. A wood chipper according to claim 2 wherein said knife-supporting member is symmetrical about said plane passing through said bottom of said generally V-shaped groove.
4. A wood chipper according to claim 1 wherein at least said cutting edges of said knives abut against each other adjacent said bottom of said generally V-shaped groove.
5. A wood chipper according to claim 1 wherein said cutting edges of said first and second knives each project a constant distance beyond said first andsecond side gills respectively throughout the lengths of said cutting e ges.
6. A wood chipper according to claim 1 wherein said edges of said wood-supporting member are knife edges.
7. A 'wood chipper according to claim 1 including means for adjusting the position of said first and second knives with respect to said knife-supporting member.
8. A wood chipper according to claim 1 wherein the included angle between said first and second side walls,
is substantially 90.
9. A wood chipper according to claim 1 wherein the plane angle between said cutting edges is substantially 152.
10. A wood chipper according to claim 1 wherein said edges of said wood-supporting member are dished in- Wardly towards each other and also are curved in curves opening away from said trough.
11. A wood chipper according to claim 1 including means supporting said wood-supporting member for rotation about said knife-supporting member.
12. A wood chipper according to claim 3 wherein at least said cutting edges of said knives abut against each other adjacent saidv bottom of said'generally V-shaped groove, wherein said cutting edges of said first and second knives-each project a constant distance beyond said first and second side walls respectively throughout the lengths of said cutting edges, and wherein said edges of said woodsupporting member are knife edges.
13. A wood chipper according to claim 12 wherein the included angle between said first and second side walls is substantially 90, and wherein the plane angle between said cutting edges is substantially 152.
14. A wood chipper comprising a knife-supporting member, means for rotatably supporting said knifesupporting member about a horizontal axis of rotation, said knife-supporting member having first. and second side having a part thereof including said cutting edge of said first knife projecting beyond said first side wall into said generally V-shaped groove, said part of said first knife being inclined at an obtuse angle to a portion of said first side wall adjacent said part of said first knife with said cutting edge of said first knife leading said first knife in said first direction of rotation of said first knife, said second knife having a part thereof including said cutting edge of said second knife projecting beyond said second side wall into said generally V-shaped groove, said part of said second knife being inclined at an obtuse angle to a portion of said second side wall adjacent said part of said second knife with said cutting edge of said second knife leading said second knife in said first direction of rotation of said second knife, said first and second knives being positioned opposite to each other, said cutting edges of said knives each having a leading portion positioned remote from the bot-tom of said generally V-shaped groove and a trailing portion positioned nearer to said bottom than said leading portion, said cutting edges being inclined in said first direction of rotation from said trailing portions to said leading portions, whereby said leading portions lead said trailing portions, said knife-supporting member having openings therein adjacent said cutting edges and adapted to permit passage of wood chips cut by said knives through said knife-supporting member, and a wood-supporting member for supporting Wood to be cut into chips by said knives, said wood-supporting member having a trough therein adapted to receive wood to be out, said wood-supporting member having a generally V- shaped end projecting and generally pointing into said generally V-shaped groove in said knife-supporting member and terminating within said generally V-shaped groove at a terminus below said horizontal axis of rotation of said knife-supporting member, at least the part of the bottom of said trough at said generally V-shaped end thereof being positioned above the lowest elevation of 'edges of said wood-supporting member, said Woodsupporting member being positioned such that wood supported thereby is compressed between said first and second knives and said wood-supporting member during cutting of said wood by rotation of said knives in said first direction.
15. A wood chipper according to claim 14 wherein said bottom of said trough is horizontal.
16. A wood chipper according to claim 14 wherein said first and second knives are symmetrically positioned 17. A wood chipper according to claim 16 wherein at least said cutting edges of said knives abut against each other adjacent said bottom of said generally V-shaped.
groove, wherein said cutting edges of said first .and second knives each project a constant distance beyond said;
9 10 first and second side walls respectively throughout the References Cited by the Examiner iii-353155 535135555 @2333 fi si edges of UNITED STATES PATENTS 18. A Wood chippier according to claim 17 wherein said 777,779 12/1904 Dmbenner 241 91 edges of said wood-supporting member are dished in- 5 825,925 7/1906 Moravec 144-172 X wardly towards each other and also are curved in curves 3190326 6/1965 Standal 144-162 opening away from said trough, and including means supporting said wood-supporting member for rotation about WILLIAM DYER Primary Exammer said knife-supporting member. W. D. BRAY, Assistant Examiner.
Claims (1)
1. A WOOD CHIPPER COMPRISING A KNIFE-SUPPORTING MEMBER, MEANS FOR ROTATABLY SUPPORTING SAID KNIFE-SUPPORTING MEMBER, SAID KNIFE-SUPPORTING MEMBER HAVING FIRST AND SECOND SIDE WALLS INCLINED TOWARDS EACH OTHER, SAID SIDE WALLS DEFINING IN SAID KNIFE-SUPPORTING MEMBER A PERIPHERAL GROOVE OF GENERALLY V-SHAPED CONFIGURATION LYING IN THE PLANE OF ROTATION OF SAID KNIFE-SUPPORTING MEMBER, AT LEAST FIRST AND SECOND KNIVES EACH HAVING A CUTTING EDGE AND EACH BEING SUPPORTED BY SAID KNIFE-SUPPORTING MEMBER, MEANS FOR ROTATING SAID KNIFE-SUPPORTING MEMBER AND SAID FIRST AND SECOND KNIVES IN A FIRST DIRECTION, SAID FIRST KNIFE HAVING A PART THEREOF INCLUDING SAID CUTTING EDGE OF SAID FIRST KNIFE PORJECTING BEYOND SAID FIRST SIDE WALL INTO SAID GENERALLY V-SHAPED GROOVE, SAID PART OF SAID FIRST KNIFE BEING INCLINED AT AN OBTUSE ANGLE TO A PORTION OF SAID FIRST SIDE WALL ADJACENT SAID PART OF SAID FIRST KNIFE WITH SAID CUTTING EDGE OF SAID FIRST KNIFE LEADING SAID FIRST KNIFE IN SAID FIRST DIRECTION OF ROTATION FOR SAID FIRST KNIFE, SAID SECOND KNIFE HAVING A PART THEREOF INCLUDING SAID CUTTING EDGE OF SAID SECOND KNIFE PROJECTING BEYOND SAID SECOND SIDE WALL INTO SAID GENERALLY V-SHAPED GROOVE, SAID PART OF SAID SECOND KNIFE BEING INCLINED AT AN OBTUSE ANGLE TO A PORTION OF SAID SECOND SIDE WALL ADJACENT SAID PART OF SAID SECOND KNIFE WITH SAID CUTTING EDGE OF SAID SECOND KNIFE LEADING SAID SECOND KNIFE IN SAID FIRST DIRECTION OF ROTATION OF SAID SECOND KNIFE, SAID FIRST AND SECOND KNIVES BEING POSITIONED OPPOSITE TO EACH OTHER, SAID CUTTING EDGES OF SAID KNIVES EACH HAVING A LEADING PORTION POSITIONED REMOTE FROM THE BOTTOM OF SAID GENERALLY V-SHAPED GROOVE AND A TRAILING PORTION POSITIONED NEARER TO SAID BOTTOM THAN SAID LEADING POSITION, SAID CUTTING EDGES BEING INCLINED IN SAID FIRST DIRECTION OF ROTATION FROM SAID TRAILING PORTIONS TO SAID LEADING PORTIONS, WHEREBY SAID LEADING PORTIONS LEAD SAID TRAILING PORTIONS, SAID KNIFE-SUPPORTING MEMBER HAVING OPENINGS THEREIN ADJACENT SAID CUTTING EDGES AND ADAPTED TO PERMIT PASSAGE OF WOOD CHIPS CUT BY SAID KNIVES THROUGH SAID KNIFE-SUPPORTING MEMBER, AND A WOOD-SUPPORTING MEMBER FOR SUPPORTING WOOD TO BE CUT INTO CHIPS BY SAID KNIVES, SAID WOOD-SUPPORTING MEMBER HAVING A TROUGH THEREIN ADAPTED TO RECEIVE WOOD TO BE CUT, SAID WOOD-SUPPORTING MEMBER HAVING A GENERALLY VSHAPED END PROJECTING AND GENERALLY POINTING INTO SAID GENERALLY V-SHAPED GROOVE IN SAID KNIFE-SUPPORTING MEMBER, SAID GENERALLY V-SHAPED END INCLUDING TWO EDGES INCLINED TOWARDS EACH OTHER TOWARDS THE BOTTOM OF SAID TROUGH AND INCLINED AT AN ACUTE ANGLE TO SAID BOTTOM OF SAID TROUGH, SAID EDGES OF SAID WOOD-SUPPORTING MEMBER BEING POSITIONED WITH RESPECT TO SAID FIRST AND SECOND KNIVES SUCH THAT SAID FIRST AND SECOND KNIVES PASS CLOSELY ADJACENT TO SAID EDGES OF SAID WOOD-SUPPORTING MEMBER DURING ROTATION OF SAID FIRST AND SECOND KNIVES IN SAID FIRST DIRECTION AND PAST SAID EDGES OF SAID WOOD-SUPPORTING MEMBER, SAID WOOD-SUPPORTING MEMBER BEING POSITIONED SUCH THAT WOOD SUPPORTED THEREBY IS COMPRESSED BETWEEN SAID FIRST AND SECOND KNIVES AND SAID WOOD-SUPPORTING MEMBER DURING CUTTING OF SAID WOOD BY ROTATION OF SAID KNIVES IN SAID FIRST DIRECTION.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US341511A US3250305A (en) | 1964-01-31 | 1964-01-31 | Wood chipper |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US341511A US3250305A (en) | 1964-01-31 | 1964-01-31 | Wood chipper |
Publications (1)
Publication Number | Publication Date |
---|---|
US3250305A true US3250305A (en) | 1966-05-10 |
Family
ID=23337893
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US341511A Expired - Lifetime US3250305A (en) | 1964-01-31 | 1964-01-31 | Wood chipper |
Country Status (1)
Country | Link |
---|---|
US (1) | US3250305A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3360024A (en) * | 1964-08-05 | 1967-12-26 | Linck Geb | Apparatus for dividing logs into chips |
US3872902A (en) * | 1972-09-21 | 1975-03-25 | Philip Nilsson | Wood-chip cutting machine |
US3907016A (en) * | 1972-05-02 | 1975-09-23 | Nicholson Mfg Co | Peripheral chipper cutting bit holder |
FR2495959A1 (en) * | 1980-12-17 | 1982-06-18 | Loiret Richard | Crusher for vegetable materials - has shaped cutters forming crushing and ejecting feed with supply hopper |
US20030201350A1 (en) * | 2002-04-26 | 2003-10-30 | Garl Keith William | V-Drum cutting head |
US20040079210A1 (en) * | 2002-10-24 | 2004-04-29 | Robitaille Joseph Andre Pascal | Log-processing machine having a pivot system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US777779A (en) * | 1903-11-10 | 1904-12-20 | Diamond Iron Works | Sawmill-hog. |
US825925A (en) * | 1901-07-06 | 1906-07-17 | John Moravec | Wood-grinder. |
US3190326A (en) * | 1960-05-27 | 1965-06-22 | Standal George Martin | Chipper apparatus |
-
1964
- 1964-01-31 US US341511A patent/US3250305A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US825925A (en) * | 1901-07-06 | 1906-07-17 | John Moravec | Wood-grinder. |
US777779A (en) * | 1903-11-10 | 1904-12-20 | Diamond Iron Works | Sawmill-hog. |
US3190326A (en) * | 1960-05-27 | 1965-06-22 | Standal George Martin | Chipper apparatus |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3360024A (en) * | 1964-08-05 | 1967-12-26 | Linck Geb | Apparatus for dividing logs into chips |
US3907016A (en) * | 1972-05-02 | 1975-09-23 | Nicholson Mfg Co | Peripheral chipper cutting bit holder |
US3872902A (en) * | 1972-09-21 | 1975-03-25 | Philip Nilsson | Wood-chip cutting machine |
FR2495959A1 (en) * | 1980-12-17 | 1982-06-18 | Loiret Richard | Crusher for vegetable materials - has shaped cutters forming crushing and ejecting feed with supply hopper |
US20030201350A1 (en) * | 2002-04-26 | 2003-10-30 | Garl Keith William | V-Drum cutting head |
US20040079210A1 (en) * | 2002-10-24 | 2004-04-29 | Robitaille Joseph Andre Pascal | Log-processing machine having a pivot system |
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