US3570567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood chip cutting apparatus
Assignee: MacMillan Bloedel Ltd
•
Filing: 1969-03-13
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Granted: 1971-03-16
•
Expires: 1989-03-13
Abstract
Abstract Apparatus for cutting away portions of wood logs, timbers, and the like as pulp chips by means of a rotor head having a plurality of holders radiating therefrom, each carrying a bent knife to cut the wood across the grain and leave a flat surface on the wood extending substantially parallel to the direction of movement thereof. Each blade is supported outwardly thereof relative to the axis of rotation of the head, and is firmly held in precise position.
Inventors
- 👤 Brian D Hickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:16
CPC Classifications
B; B27; B27G; B27G13/00; B27G13/02; B27G13/04; B27G13/08; B27L; B27L11/00; B27L11/005; B27L11/007
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
173 words
Apparatus for cutting away portions of wood logs and the like as pulp chips by means of one or more bent knives and leaving flat surfaces on the wood, comprising at least one knife having a grain severing flank and a finishing flank extending at an angle to said grain flank, a hub having a rim, a knife holder secured to the hub and having an inner clamping surface extending generally axially of the hub and spaced from the rim thereof and against which an outer surface of the grain flank of the knife bears, a clamping plate against an inner surface of said knife grain flank, bolt means for clamping said holder, knife and plate together, first guide means on the holder at the outer end of the grain flank, and second guide means on the holder at the outer end of the finishing flank, said first and second guide means keeping the knife in place when said bolt means permits movement thereof and not interfering when the bolt means is tightened.
Claim 2
Dependent Claim
173 words
Apparatus for cutting away portions of wood logs and the like as pulp chips by means of one or more bent knives and leaving flat surfaces on the wood, comprising at least one knife having a grain severing flank and a finishing flank extending at an angle to said grain flank, a hub having a rim, a knife holder secured to the hub and having an inner clamping surface extending generally axially of the hub and spaced from the rim thereof and against which an outer surface of the grain flank of the knife bears, a clamping plate against an inner surface of said knife grain flank, bolt means for clamping said holder, knife and plate together, first guide means on the holder at the outer end of the grain flank, and second guide means on the holder at the outer end of the finishing flank, said first and second guide means keeping the knife in place when said bolt means permits movement thereof and not interfering when the bolt means is tightened.
Claim 3
Dependent Claim
84 words
Cutting apparatus as claimed in claim 1 in which said knife holder includes a side section secured to said rim near an outer edge thereof and radiating therefrom, and a back section connected to the side section and spaced outwardly from and extending across said rim, said inner clamping surface being on the back section, and said side section having an inner surface extending substantially parallel to said outer edge of the rim and along which the knife finishing flank extends in spaced relationship.
Claim 4
Dependent Claim
38 words
Cutting apparatus as claimed in claim 2 in which said first guide means comprises a shoulder on the back section substantially parallel to said bolt means and substantially normal to said inner clamping surface of the back section.
Claim 5
Dependent Claim
44 words
Cutting apparatus as claimed in claim 3 in which said second guide means comprises a shoulder in the side section substantially parallel to said bolt means and said first guide means shoulder and at an angle to said inner surface of the side section.
Claim 6
Dependent Claim
23 words
Cutting apparatus as claimed in claim 2 in which said back section is inclined outwardly in a radial direction from said side section.
Claim 7
Dependent Claim
29 words
Cutting apparatus as claimed in claim 5 in which said back section is inclined forwardly from said side section with reference to the direction of rotation of the rim.
Claim 8
Dependent Claim
25 words
Cutting apparatus as claimed in claim 2 including a lug on and radiating from said rim and to which said side section is removably connected.
Claim 9
Dependent Claim
39 words
Cutting apparatus as claimed in claim 7 in which said lug has an end near the outer edge of the rim, said lug extending across the rim and rearwardly with reference to the direction of rotation of the rim.
Claim 10
Dependent Claim
34 words
Cutting apparatus as claimed in claim 1 in which said bolt means comprises a plurality of bolts extending through said holder, slots in the grain flank of the knife, and into the clamping plate.
Claim 11
Dependent Claim
47 words
Cutting apparatus as claimed in claim 2 including a spoke connected to and radiating from the hub to the opposite end of the back section from said side section, and means removably connecting said opposite end of the back section to said outer end of the spoke.
Claim 12
Dependent Claim
80 words
Cutting apparatus as claimed in claim 2 including a supporting disc connected to the hub inwardly of the rim thereof, a spoke connected to said disc and radiating therefrom to the opposite end of the back section from said side section, and means removably connecting said opposite end of the back section to said outer end of the spoke, said back and side sections and the spoke forming an inner channel through which chips cut by the knife can travel.
Claim 13
Dependent Claim
24 words
Cutting apparatus as claimed in claim 11 including cover means between the rim and the supporting disc and forming a wall of said channel.
Claim 14
Dependent Claim
48 words
Cutting apparatus as claimed in claim 11 in which said channel has an entrance end near said knife and an opposite exit end, and said spoke is bent outwardly relative to the channel so as to make said exit end of the channel larger than the entrance thereof.
Claim 15
Dependent Claim
42 words
Cutting apparatus as claimed in claim 13 in which the surface of said clamping plate is inclined towards said exit end of the passage so that chips on said inclined surface slide towards the exit end under the action of centrifugal force.
Claim 16
Dependent Claim
36 words
Cutting apparatus as claimed in claim 2 including a lug on and radiating from said rim, said side section overlapping the lug, and bolt means through and removably securing together the lug and the side section.
Claim 17
Dependent Claim
56 words
Cutting apparatus as claimed in claim 2 in which said clamping plate has a shoulder overlapping a rearward edge of the grain flank of the knife, and including means between said shoulder and said rearward edge of the grain flank for maintaining the knife in proper cutting position between the clamping plate and the knife holder.
Claim 18
Dependent Claim
31 words
Cutting apparatus as claimed in claim 16 in which said knife maintaining means is adjustable so as to maintain said knife in proper cutting position after the knife has been sharpened.
Claim 19
Dependent Claim
29 words
CUtting apparatus as claimed in claim 2 in which said side section of the holder is connected to a base, and said base is removably secured to the rim.
Claim 20
Dependent Claim
42 words
Cutting apparatus as claimed in claim 18 including a brace radiating from said base and connected at one end to the latter and at its opposite end to the opposite end of the back section from the side section of the holder.
Claim 21
Dependent Claim
34 words
Cutting apparatus as claimed in claim 19 in which said first guide means comprises a shoulder on the back section substantially parallel to said bolt means and substantially normal to said inner clamping surface.
Claim 22
Dependent Claim
44 words
Cutting apparatus as claimed in claim 20 in which said second guide means comprises a shoulder on the side section substantially parallel to said bolt means and said first guide means shoulder and at an angle to said inner surface of the side section.
Claim 23
Dependent Claim
56 words
Cutting apparatus as claimed in claim 19 in which said clamping plate has a shoulder overlapping a rearward edge of the grain flank of the knife, and including means between said shoulder and said rearward edge of the grain flank for maintaining the knife in proper cutting position between the clamping plate and the knife holder.
Claim 24
Dependent Claim
31 words
Cutting apparatus as claimed in claim 22 in which said knife maintaining means is adjustable so as to maintain said knife in proper cutting position after the knife has been sharpened.
References Cited (Backward Citations)
US2938553A
Cited
US3282312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |