US3347291A - Apparatus and knife for the production of wood chips from logs - Google Patents

Apparatus and knife for the production of wood chips from logs Download PDF

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Publication number
US3347291A
US3347291A US425493A US42549365A US3347291A US 3347291 A US3347291 A US 3347291A US 425493 A US425493 A US 425493A US 42549365 A US42549365 A US 42549365A US 3347291 A US3347291 A US 3347291A
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United States
Prior art keywords
drum
knife
edges
shaving
cutting
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Expired - Lifetime
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US425493A
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English (en)
Inventor
Wexell Harry Wilhelm
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Brundell and Jonsson AB
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Brundell and Jonsson AB
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Publication date
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Priority to US425493A priority Critical patent/US3347291A/en
Priority to DE19661528304 priority patent/DE1528304A1/de
Application granted granted Critical
Publication of US3347291A publication Critical patent/US3347291A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • This invention relates to woodworking and more particularly to an apparatus for the production of wood chips from logs and also to a multiple unit knife having a plurality of longitudinally spaced cutting components thereon particularly adapted for use in the apparatus and the apparatus of this invention is primarily intended for reducing an entire log to usable chips.
  • the drum is rotated at a relatively slow speed and logs are forced transversely against the side of the drum which results in the cutting of strips crosswise of the log by the cutters and such cuts are generally parallel to the direction of the fibers in the log.
  • These strips which have a substantially uniform thickness pass through slits into the interior of the drum against the action of centrifugal force and are discharged from the drum through one or both ends.
  • a further object of the invention is the provision of an apparatus for the production of chips from logs, which apparatus serves to accommodate logs of any length and also over a relatively wide range of diameters.
  • a still further object of the invention is the provision of an apparatus for reducing an entire log to usable cli'ips of substantially uniform width and thickness.
  • Another object of the invention is the provision of an apparatus for reducing logs to chips, which apparatus includes a rotatable drum disposed on a horizontal axis with cutters secured to the drum and projecting inwardly thereof and with logs being fed longitudinally into the drum.
  • a further object of the invention is the provision of an apparatus for the production of chips from logs, such apparatus including a rotatably mounted elongated, hollow frusto-conical drum open at one end, such drum having a plurality of circumferentially spaced longitudinally extending slots therein and with an elongated multiple unit knife secured in each slot and projecting into the interior of the drum chips being discharged radially outwardly through the slots, such discharge being assisted by the action of centrifugal force.
  • a further object of the invention is the provision of an apparatus for producing wood chips from logs, such apparatus including a rotatably mounted hollow di-um there being a plurality of circumferentially spaced multiple unit knives secured to the drum and projecting inwardly thereof with the cutting components of the knives displaced longitudinally with respect to each other in order to provide successive overlapping cutting edges disposed in helical spiral paths longitudinally of the drum.
  • a still further object of the invention is the provision of an apparatus for the production of wood chips from logs, such apparatus including a rotatably mounted hollow drum there being a plurality of circumferentially spaced longitudinally extending slots in the drum, each slot serving to receive a multiple unit knife and there being means for removably securing such knives in adjusted position and for permitting convenient removal or replacement thereof.
  • Another object of the invention is the provision of a multiple unit knife for use in an apparatus for the production of wood chips from logs, such knife including a plurality of cutting components, each component having a shaving edge joined at one end by an angularly related parting edge with the shaving edges of the components on each knife being substantially parallel and arranged in echelon with respect to the lines of parallelism of the shaving edges.
  • a further object of the invention is the provision of a multiple unit knife for use in an apparatus for the production of wood chips from logs, such knife including a plurality of cutting components, each component having a shaving edge joined at one end by an angularly related parting edge and with adjacent cutting components spaced from each other with the intervening portion of the knife edge being relieved to provide non-cutting portions between the terminal end of a parting edge of one component and the terminal end of the shaving edge of the next adjacent component.
  • a still further object of the invention is the provision of a multiple unit knife for use in an apparatus for the production of wood chips from logs, such knife including a plurality of cutting components having a shaving edge joined at one end by an angularly related parting edge, the obverse surface of the knife blade which terminates in the shaving and parting edges being corrugated with the lines of corrugation being substantially parallel and extending generally transversely from the point of juncture between the shaving edge and the parting edge of each component.
  • a further object of the invention is the provision of a multiple unit knife for use in an apparatus for the production of wood chips from logs, such knife including a blade having a plurality of cutting components, each having a shaving edge joined at one end by an angularly related parting edge and in which the blade is formed of corru gated material of substantially uniform thickness.
  • FIG. 1 is a view in perspective showing the drum of an apparatus for the production of wood chips from logs, together with the manner in which the multiple unit knives are disposed in the drum, as well as the manner of feeding a log to the drum to be reduced to chips;
  • FIG. 2 a fragmentary view in perspective showing the manner in which the multiple unit knives are secured in place in circumferentially spaced slots in the drum shown in FIG. 1;
  • FIG. 3 a top plan view of a multiple unit knife for use in the chipping apparatus of FIG. 1;
  • FIG. 4 a front elevational view of the multiple unit knife of FIG. 3;
  • FIG. 5 a bottom plan view of the knife of FIG. 3'
  • FIG. 6 a sectional view taken substantially on the line 66 of FIG. 3;
  • FIG. 7 a front elevational view showing a multiple unit knife formed of corrugated material of substantially uniform thickness
  • FIG. 8 a fragmentary view in perspective similar to FIG. 2, but showing the manner in which the corrugated knife of FIG. 7 is secured in the drum;
  • FIG. 9 a View in perspective showing a wood chip produced by the apparatus and knife of this invention.
  • FIG. 10 a transverse sectional view of the chip shown in FIG. 9.
  • FIGS. 1 and 2 there is shown in FIGS. 1 and 2 a hollow drum 10 which may be utilized in an apparatus for producing wood chips from logs, the drum 10, as shown in FIGS. 1 and 2, being hollow and frusto-conical in form by a proper disposition of the cutters in the drum in a manner to be later described, such drum may, if desired, be cylindrical in formation.
  • the drum 10 may be rotatably supported in any suitable manner by a shaft 11 and, of course, suitable mean for driving the drum will be provided.
  • the drum 10 may be provided with a plurality of circumferentially spaced longitudinally extending slots 12 and such slots may be closed at the end of the drum remote from the shaft 11 by a ring 13 which may be rernovably secured in place by a screw threaded or other suitable fastening means 14.
  • One side of each slot 12 is beveled to provide a knife blade engaging and supporting surface 15.
  • a plurality of ears 16 are provided adjacent the outer edge of the beveled surface 15 and the ears 16 are provided with aligned apertures 17 which serve to receive a rod 18 on which is pivotally mounted a clamping jaw 19 having a beveled clamping surface 20 and clamping screws 21 may be threadedly received in a segmental cover plate 22 which is secured to the outer surface of the drum 10 between each adjacent pair of slots 12 and with one edge 23 of the cover plate 22 overhanging the adjacent beveled surface 15 and as is clearly shown in FIG. 2, the clamping screws 21 engage the clamping jaw 20 and serve to urge the same toward the beveled surface 15.
  • the segmental cover plate 22 may be removably secured to the drum 10 by screw threaded or other suitable fastening means 24.
  • the space between the overhanging edge 23 of the cover plate 22 and clamping jaw 20 may be closed by an elongated closure plate 25 secured to the clamping jaw 19 and overlapping the overhanging edge 23 of the cover plate 22.
  • a multiple unit knife 26, the structure of which will be later described, is disposed in each slot 12 with the reverse surface of the knife 26 engaging the beveled surface 15 of the drum 10 and with a clamping bar 27 engaging the upper face of the knife 26 and the clamping jaw 19 is urged into engagement with the clamping bar 27 to securely clamp the knife 26 in place in engagement with the beveled surface 15.
  • the knife 26 may be released for adjustment or removal by suitable manipulation of the clamping screws 21.
  • such knife may comprise an elongated blade carrying a plurality of cutting components, each of which comprises a shaving or slicing edge 28 joined at one end by an angularly related parting edge 29. All of the shaving edges 28 are substantially parallel and are arranged in echelon with respect to the lines of parallelism of the shaving edges 28.
  • the cutting components provided by the shaving and parting edges 28 and 29 are longitudinally spaced from each other and the intervening portion 30 between adjacent cutting components is relieved to provide a non-cutting portion between the terminal end 31 of a parting edge 29 and the terminal end 32 of the next adjacent shaving edge 28.
  • the included angle between the shaving edge 28 and the parting edge 29 of each component in the general plane of the blade 28 is obtuse and furthermore, the shaving edge 28 and the parting edge 29 of each component are angularly related with respect to a plane normal to the general plane of blade 28 and the included angle in this plane is also obtuse.
  • the obverse surface 33 of the blade 28 is corrugated with the lines of corrugation being substantially parallel and extending generally transversely from the point of juncture between the cutting edges 28 and 29 of each component and the lines of corrugation substantially bisect the included angle of each component in the general plane of the blade.
  • the reverse face 34 of the blade 28 is plane and the obverse face 33 and the reverse face 34 are joined at the cutting edges by clearance faces 35 formed to provide acute included angles between the clearance faces 35 and the obverse face 33 of the blade 28.
  • the surface of the clamping bar 27 engaging the obverse face 33 of the knife 26 is formed complementary to the corrugated obverse face 33 in such a manner as to mate therewith and thereby securely hold the knife 26 in place in engagement with the beveled surface 15 of the drum 10.
  • FIG. 7 there is shown a somewhat modified form of multiple unit knife in which there is provided a blade 36 formed of corrugated material of substantially uniform thickness and such blade is also formed to provide shaving edges 37 and parting edges 38 which are formed in the same manner and have the same relationship as the corresponding edges of the knife shown in FIGS. 3 to 6 and described above.
  • the corrugated knife shown in FIG. 7 is secured in the slot 12 of the drum 10 in exactly the same manner as described above in connection with the knife having a plane reverse face and with particular reference to FIG. 8, it will be seen that whereas as shown in FIG. 2, the beveled surface 15 is flat, in FIG.
  • the beveled surface 3 9 is corrugated to correspond to the beveled reverse face 40 of the corrugated knife 36, and, therefore, the corrugated beveled surface 39 will mate with the beveled reverse face of the knife 36 and securely hold the same in position in the drum 10.
  • the interior surface of the drum 10 may be provided with spiral grooves 41 which, in effect, form continuations of the shearing edges 28 and parting edges 29 of the cutting component of the knife 26 and such grooves 41 provide clearance spaces for these cutting edges on the interior of the drum 10.
  • the adjacent knives 26 disposed in the grooves 12 of the drum are displaced longitudinally with respect to each other a distance less than the distance between adjacent cutting components to provide successive overlapping cutting edges disposed in helical spiral paths longitudinally of the drum 10 and by reason of this disposition of the knives 26 when a log 42 is fed longitudinally into the open end of the drum 10 in the direction in which the axis of the log 42 is substantially parallel to the shearing edges 28 of the knives 2-6 upon rotation of the drum 10 a succession of helicoidal chips 43 as shown in FIGS.
  • the same is frusto-conical in form, but the same may, if desired, be provided as a cylindrical drum in which case the knives 26 are arranged in such a manner as to dispose the shearing edges 28 parallel to the axis of a log 42 to be fed thereto and with such shearing edges 28 arranged in echelon in the same manner as described in conjunction with a frusto-conical drum.
  • the manner of positioning and securing the knives in the drum is relatively simple and permits convenient adjustment or replacement of the knives and the chips removed from the log are discharged outwardly through the slots 12 in a manner whereby such discharge of the chips is assisted by centrifugal force.
  • An apparatus for the production of wood chips from logs comprising an elongated hollow drum open at one end, means for mounting said drum for rotation about the longitudinal axis, said drum having a plurality of circumferentially spaced longitudinally extending slots in the peripheral wall, a removable ring secured to' said drur'nand closing said slots at the open end of said drum, one side of each slot being beveled to provide a knife engaging and supporting surface, an elongated multiple unit knife having an obverse and a reverse face disposed in each slot with said reverse face engaging said beveled surface, each knife comprising a blade carrying a plurality of longitudinally spaced cutting components, each component having a shaving edge joined at one end by an angularly related parting edge, the shaving edges of the components being substantially parallel and arranged in echelon with respect to the lines of parallelism of the shaving edges, said shaving and parting edges projecting inwardly of the inner surface of said drum with the distance from the shaving and parting edges to the longitudinal axis of
  • An apparatus for the production of wood chips from logs comprising an elongated hollow drum open at one end, means for mounting said drum for rotation about the longitudinal axis, said drum having a plurality of circumferentially spaced longitudinally extending slots in the peripheral wall, one side of each slot being beveled to provide a knife engaging and supporting surface, an elongated multiple unit knife having an observe and a reverse face disposed in each slot with said reverse face engaging said beveled surface, each knife comprising a blade carrying a plurality of longitudinally spaced cutting components, each component having a shaving edge joined at one end by an angularly related parting edge, the shaving edges of the components being substantially parallel and arranged in echelon with respect to the lines of parallelism of the shaving edges, said shaving and parting edges projecting inwardly of the inner surface of said drum with the distance from the shaving and parting edges to the longitudinal axis of said drum progressively decreasing from the open end of said drum toward the opposite end, adjacent knives being displaced longitudinally with respect to each
  • An apparatus for the production of wood chips from logs comprising an elongated hollow drum open at one end, means for mounting said drum for rotation about the longitudinal axis, said drum having a plurality of circumferentially spaced longitudinally extending slots in the peripheral wall, one side of each slot being beveled to provide a knife engaging and supporting surface, an elongated multiple unit knife having an obverse and a reverse face disposed in each slot with said reverse face engaging said beveled surface, each knife comprising a blade carrying a plurality of longitudinally spaced cutting components, each component having a shaving edge joined at one end by an angularly related parting edge, the shaving edges of the components being substantially parallel and arranged in echelon with respect to the lines of parallelism of the shaving edges, said shaving and parting edges projecting inwardly of the inner surface of said drum with the distance from the shaving and parting edges to the longitudinal axis of said drum progressively decreasing from the open end of said drum toward the opposite end, adjacent knives being displaced longitudinally wit
  • An apparatus for the production of wood chips from logs comprising an elongated hollow drum open at one end, means for mounting said drum [for rotation about the longitudinal axis, said drum having a plurality of circumferentially spaced longitudinally extending slots in the peripheral Wall, an elongated multiple unit knife disposed in each slot, each knife comprising a blade carrying a plurality of longitudinally spaced cutting components, each component having a shaving edge joined at one end by an angularly related parting edge, the shaving edges of the components being substantially parallel and arranged in echelon with respect to the lines of parallelism of the shaving edges, said shaving and parting edges projecting inwardly of the inner surface of said drum with the distance from the shaving and parting edges to the longitudinal axis of said drum 8 progressively decreasing from the open end of said drum toward the opopsite end, adjacent knives being displaced longitudinally with respect to each other a distance less than the distance between adjacent cutting components to provide successive overlapping cutting edges disposed in helical spiral paths longitudinally of said drum,
  • a multiple unit knife comprising a blade carrying a plurality of cutting components longitudinally spaced from each other, each component having a shaving edge joined at one end by an angularly related parting edge, the shaving edges of the components being substantially parallel and arranged in echelon with respect to the lines of parallelism of the shaving edges, and with the intervening portions of the blade edge being relieved to provide a noncutting portion between the terminal end of the parting edge of one component and the terminal end of the shaving edge of the next adjacent component.
  • a knife as defined in claim 16 in which said lines of corrugation substantially bisect the included angle of each component in said general plane of the blade.

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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)
  • Milling, Drilling, And Turning Of Wood (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
US425493A 1965-01-14 1965-01-14 Apparatus and knife for the production of wood chips from logs Expired - Lifetime US3347291A (en)

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Application Number Priority Date Filing Date Title
US425493A US3347291A (en) 1965-01-14 1965-01-14 Apparatus and knife for the production of wood chips from logs
DE19661528304 DE1528304A1 (de) 1965-01-14 1966-01-05 Zerspanungsmaschine

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US425493A US3347291A (en) 1965-01-14 1965-01-14 Apparatus and knife for the production of wood chips from logs

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Cited By (1)

* 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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19713726C1 (de) * 1997-04-03 1998-06-25 Maier Zerkleinerungstech Gmbh Hackrotor für eine Hackmaschine
DE19902873A1 (de) * 1999-01-25 2000-08-03 Hans Dietz Spanerwerkzeug
EP1316397A3 (de) * 2001-11-30 2007-11-07 Esterer WD GmbH & Co. Vorrichtung zum Erzeugen von Hackschnitzeln aus Holz
CA2491977A1 (en) * 2005-01-07 2006-07-07 Iggesund Tools Ab Clamping assemblying for woodworking knife

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB868208A (en) * 1958-11-27 1961-05-17 Anglo Paper Prod Ltd Wood chips and production thereof
US3216470A (en) * 1962-07-09 1965-11-09 Soderhamns Verkst Er Ab Method and a machine for producing wood particles

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB868208A (en) * 1958-11-27 1961-05-17 Anglo Paper Prod Ltd Wood chips and production thereof
US3216470A (en) * 1962-07-09 1965-11-09 Soderhamns Verkst Er Ab Method and a machine for producing wood particles

Cited By (1)

* 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

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DE1528304A1 (de) 1970-10-08

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