Patent US3777793A successfully refreshed from Google Patents.
US3777793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife holder in log slabbing chipper
Assignee: USNR LLC
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Filing: 1972-05-11
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Granted: 1973-12-11
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Expires: 1992-05-11
Abstract
Abstract The chipper comprises a rotor with a plurality of knives adapted to slab off the side of a log so that the first saw cut following the chipper removes a usable board. In order to make usable pulp chips, the chipper knives are of bent configuration, each having a grain cutting portion which cuts across the grain and a planing portion which cuts parallel with the grain to leave a smooth board surface on the log as it is moved lengthwise past the chipper on a saw carriage. Each knife is clamped rigidly in working position by a clamp plate which is tightened on a pair of wedges adjacent the side edges of the knife. The clamp plate is crowned, causing it to flatten against substantially the whole area of the knife when the clamp plate is tightened on the wedges.
Inventors
- 👤 F Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:04
CPC Classifications
B; B27; B27L; B27L11/00; B27L11/007; B27B; B27B33/00; B27B33/20; Y; Y10; Y10T; Y10T407/00; Y10T407/19; Y10T407/1906; Y10T407/1928; Y10T407/193; Y10T407/1932; Y10T407/1934
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A holding means for a woodworking knife comprising a support member having a surface arranged to support one face of the knife, a pair of wedging abutment surfaces opposed to said knife supporting surface along opposite sides thereof, a resilient, crowned clamp plate having a pair of wedge surfaces extending along opposite sides thereof on a back face of the clamp plate for sliding engagement with said wedging abutment surfaces, the crown portion of said clamp plate being arched between said wedge surfaces to engage a mid portion of the oppsite face of the knife, means to slide said clamp plate on said wedging abutment surfaces causing the arch of said clamp plate to flatten against and clamp substantially the whole area of said knife against said supporting surface, and means to hold the knife against said slIding movement.
Claim 2
Dependent Claim
139 words
A holding means for a woodworking knife comprising a support member having a surface arranged to support one face of the knife, a pair of wedging abutment surfaces opposed to said knife supporting surface along opposite sides thereof, a resilient, crowned clamp plate having a pair of wedge surfaces extending along opposite sides thereof on a back face of the clamp plate for sliding engagement with said wedging abutment surfaces, the crown portion of said clamp plate being arched between said wedge surfaces to engage a mid portion of the oppsite face of the knife, means to slide said clamp plate on said wedging abutment surfaces causing the arch of said clamp plate to flatten against and clamp substantially the whole area of said knife against said supporting surface, and means to hold the knife against said slIding movement.
Claim 3
Dependent Claim
35 words
A holding means as defined in claim 1, said wedge surfaces being inclined in a direction to flatten said clamp plate when said clamp plate is moved away from the cutting edge of the knife.
Claim 4
Dependent Claim
23 words
A holding means as defined in claim 2, said sliding means comprising a single screw on the back edge of said clamp plate.
Claim 5
Dependent Claim
67 words
A holding means as defined in claim 1, said support member having two knife supporting portions disposed in angular relation to each other, one of said wedging abutment surfaces being opposed to one of said supporting surface portions and the other wedging abutment surface being opposed to the other supporting surface portion, said clamp plate having knife engaging surfaces opposed to both of said supporting surface portions.
Claim 6
Dependent Claim
45 words
A holding means as defined in claim 4 including a rotor having knives each with a planing portion and chip cutting portion, one of said supporting surface portions supporting said planing portion of a knife and the other supporting surface portion said chip cutting portion.
Claim 7
Dependent Claim
35 words
A holding means as defined in claim 1, said means to hold said knife against sliding movement comprising a flanged backing bar assembly, and a groove in said support member arranged to receive said flange.
Claim 8
Dependent Claim
26 words
A holding means as defined in claim 1, said holding means being open on the back side of said clamp plate for the passage of chips.
Claim 9
Dependent Claim
22 words
A holding means as defined in claim 1 including a rotor, said support member comprising an integral structural part of said rotor.
Claim 10
Dependent Claim
65 words
A holding means as defined in claim 8, said rotor being generally frusto-conical in shape with a circumferential series of wall members which recede radially toward their trailing ends to provide a chip opening between the trailing end of each wall member and the leading end of the following wall member, and the inside of each of said wall members containing said knife supporting surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |