Patent US3633833A successfully refreshed from Google Patents.
US3633833A
Expired / Lapsed
US
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Machine with self-sharpening means for cutting scrap materials into chips
Assignee: Individual
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Filing: 1969-12-04
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Granted: 1972-01-11
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Expires: 1989-12-04
Abstract
Abstract The machine has a series of hammerlike knives which rotate about a common axis to cut scrap material fed across an anvil into small chips. In one embodiment, each knife has a massive head including a blunt front face with a V-shaped bottom cutting edge defining a pair of downwardly projecting prongs. In a second embodiment, the head of each knife has a V-shaped cutting edge defining a single downward projection. The cutting edge of both knife embodiments is straight as viewed in the cutting plane of the anvil. The bottom of the head just rearwardly of the cutting edge includes a pocket to trap and fragment by impact chips severed by the cutting edge. The cutting edges of all knives are sharpened at the same time as they rotate by a grinding cylinder which is fed either manually or automatically at a fixed rate into engagement with beveled forward faces of the knives. The grinding cylinder and its automatic feed are driven by the same means that drives the knives.
Inventors
- 👤 Stanley V Ehrlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:40
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/28; B02C18/00; B02C18/0084; B02C23/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
In an apparatus for cutting scrap materials into small chips: anvil means defining a stationary cutting edge, means for feeding scrap material across said anvil means and over said cutting edge, rotor means pivotally mounting a plurality of laterally related hammerlike knife members for pivoting movement about pivot axes parallel to and SPACED equal distances from a common rotor axis extending in the general direction of said anvil cutting edge in a manner so that each said knife member rotates into periodic cutting relationship with said anvil cutting edge, each of said knife members including a knife cutting edge defined by a forward cutting face and a bottom cutting face thereof, and sharpening means movable into engagement with said forward cutting faces of said knife members as said knife members rotate to sharpen said knife cutting edges, said sharpEning means including a cylindrical grinding wheel having a length substantially coextensive with the lateral extent of said plurality of knife members, and rotatable in the same direction as said knife members, self-feeding means for feeding said grinding wheel toward said knife members at a predetermined slow rate of travel, and manually operated override means for moving said grinding wheel toward and away from said knife members at a fast rate of travel.
Claim 2
Dependent Claim
211 words
In an apparatus for cutting scrap materials into small chips: anvil means defining a stationary cutting edge, means for feeding scrap material across said anvil means and over said cutting edge, rotor means pivotally mounting a plurality of laterally related hammerlike knife members for pivoting movement about pivot axes parallel to and SPACED equal distances from a common rotor axis extending in the general direction of said anvil cutting edge in a manner so that each said knife member rotates into periodic cutting relationship with said anvil cutting edge, each of said knife members including a knife cutting edge defined by a forward cutting face and a bottom cutting face thereof, and sharpening means movable into engagement with said forward cutting faces of said knife members as said knife members rotate to sharpen said knife cutting edges, said sharpEning means including a cylindrical grinding wheel having a length substantially coextensive with the lateral extent of said plurality of knife members, and rotatable in the same direction as said knife members, self-feeding means for feeding said grinding wheel toward said knife members at a predetermined slow rate of travel, and manually operated override means for moving said grinding wheel toward and away from said knife members at a fast rate of travel.
Claim 3
Dependent Claim
115 words
Apparatus according to claim 1 wherein said self-feeding means and said manual override means include screw means operable upon rotation to move said grinding wheel toward and away from said knife members, and said self-feeding means further including drive means for rotating said screw means drivingly connected to means for rotating said knife members, said drive means including speed-reducing means, and eccentric means driving a pawl and ratchet means whereby said screw means is rotated at a predetermined slower speed than said knife members and the amount of metal removed from said knife members can be determined by counting strokes of said ratchet and pawl means, and clutch means for selectively disengaging said drive means.
Claim 4
Dependent Claim
65 words
Apparatus according to claim 2 wherein said means for rotating said grinding wheel means includes second drive means drivingly connected to said means for rotating said knife members, said second drive means including automatic adjustment means operable to compensate for the varying distance between the rotational axis of said wheel means and the rotational axis of said knife members to provide a continuous drive therebetween.
Claim 5
Dependent Claim
23 words
Apparatus according to claim 2 wherein said manual override means includes means for manually rotating said screw means with said clutch means disengaged.
Claim 6
Dependent Claim
40 words
Apparatus according to claim 1 wherein said knife cutting edge is V-shaped as viewed toward the front of said knife member so as to define a pair of pointed projections at the laterally opposite extremities of said knife cutting edge.
Claim 7
Dependent Claim
61 words
Apparatus according to claim 5 wherein each knife member includes a bottom surface intersecting said forward cutting face to define said knife cutting edge, said bottom surface being recessed rearwardly of said knife cutting edge and recessed laterally inwardly of opposite lower side edges of said knife member to define a pocket for receiving material severed by said knife cutting edge.
Claim 8
Dependent Claim
66 words
Apparatus according to claim 1 wherein each said knife member includes a bottom surface portion intersecting said forward cutting face at a V-shaped knife cutting edge, said V-shaped knife cutting edge forming a downward pointed projection for penetrating, crushing and severing material and forming forward end of a pocket defined by said bottom surface portion for trapping and fragmenting by impact material severed by said projection.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |