US5141168A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Macerating machine
Assignee: NOV Process and Flow Technologies UK Ltd
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Filing: 1992-01-03
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Granted: 1992-08-25
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Expires: 2012-01-03
Abstract
Abstract A cutter for a macerator of a type having first and second parallel contra-rotating shafts, each having a plurality of alternate cutters and spacers at the same axial thickness, the cutters of the first shaft being interleaved with those of the second shaft. The cutter of the invention has generally circumferentially spaced teeth 14, 16, 18, 22, each tooth having a front cutting face 26, 28, 30, 32, 34, and an inclined, generally ramp shaped rear face 46, 48, 50, 52, 54, which may be serrated. One tooth 14 has a "square" front face 26 which extends substantially parallel to the axis of the cutter while the front faces of the remaining teeth are inclined, preferably alternately, to the axis of the cutter.
Inventors
- 👤 Robert Pepper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:05
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/06; B02C18/16; B02C18/18; B02C18/182
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
168 words
A cutter for a macerator of the type having first and second parallel contra-rotating shafts, each having a plurality of alternate cutters and spacers of the same axial thickness, the cutters of the first shaft being interleaved with those of the second shaft, said cutter comprising a plurality of circumferentially substantially equally spaced teeth, a front concave cutting face and a generally ramp shaped, inclined, rear face on each tooth, the circumferential extent of each tooth from the front concave cutting face thereof to the rear most circumferential point of the rear face thereof being less than the spacing between the rear most point of the rear face of one tooth and the front cutting face of the next adjacent tooth, the front face of at least one tooth extending substantially parallel to the axis of the cutter and the front faces of the other teeth being inclined alternatively to one side of the axis of the cutter and the other side of the axis of the cutter.
Claim 2
Dependent Claim
168 words
A cutter for a macerator of the type having first and second parallel contra-rotating shafts, each having a plurality of alternate cutters and spacers of the same axial thickness, the cutters of the first shaft being interleaved with those of the second shaft, said cutter comprising a plurality of circumferentially substantially equally spaced teeth, a front concave cutting face and a generally ramp shaped, inclined, rear face on each tooth, the circumferential extent of each tooth from the front concave cutting face thereof to the rear most circumferential point of the rear face thereof being less than the spacing between the rear most point of the rear face of one tooth and the front cutting face of the next adjacent tooth, the front face of at least one tooth extending substantially parallel to the axis of the cutter and the front faces of the other teeth being inclined alternatively to one side of the axis of the cutter and the other side of the axis of the cutter.
Claim 3
Dependent Claim
32 words
A cutter as claimed in claim 1, wherein the front faces of said other teeth are inclined at an angle of 25° to 50° with respect to the axis of the cutter.
Claim 4
Dependent Claim
25 words
A cutter as claimed in claim 1, wherein the rear faces of the teeth further comprise serrations along at least a part of their length.
Claim 5
Dependent Claim
17 words
A cutter as claimed in claim 3, wherein said serrations define an angle of 55° to 65°.
Claim 6
Dependent Claim
32 words
A cutter as claimed in claim 3, wherein the rear face of each tooth is arcuately convex for a portion of the length between the serrations and the tip of the tooth.
Claim 7
Dependent Claim
50 words
A cutter as claimed in claim 1, wherein there are an odd number of teeth, and wherein there is only one tooth which has its front face extending substantially parallel to the axis of the cutter, the remaining teeth having their front faces inclined to the axis of the cutter.
Claim 8
Dependent Claim
163 words
A macerator having first and second parallel contra-rotating shafts, each having a plurality of alternate cutters and spacers of the same axial thickness, the cutters of the first shaft being interleaved with those of the second shaft, each cutter comprising a plurality of circumferentially substantially equally spaced teeth, a front concave cutting face and a generally ramp shaped, inclined, rear face on each tooth, the circumferential extent of each tooth from the front concave cutting face thereof to the rear most circumferential point of the rear face thereof being less than the spacing between the rear most point of the rear face of one tooth and the front cutting face of the next adjacent tooth, the front face of at least one tooth extending substantially parallel to the axis of the cutter and the front faces of the other teeth being inclined alternatively to one side of the axis of the cutter and to the other side of the axis of the cutter.
Claim 9
Dependent Claim
163 words
A macerator having first and second parallel contra-rotating shafts, each having a plurality of alternate cutters and spacers of the same axial thickness, the cutters of the first shaft being interleaved with those of the second shaft, each cutter comprising a plurality of circumferentially substantially equally spaced teeth, a front concave cutting face and a generally ramp shaped, inclined, rear face on each tooth, the circumferential extent of each tooth from the front concave cutting face thereof to the rear most circumferential point of the rear face thereof being less than the spacing between the rear most point of the rear face of one tooth and the front cutting face of the next adjacent tooth, the front face of at least one tooth extending substantially parallel to the axis of the cutter and the front faces of the other teeth being inclined alternatively to one side of the axis of the cutter and to the other side of the axis of the cutter.
Claim 10
Dependent Claim
32 words
A macerator as claimed in claim 7, wherein the front faces of said other teeth are inclined at an angle of 25° to 50° with respect to the axis of the cutter.
Claim 11
Dependent Claim
25 words
A macerator as claimed in claim 7, wherein the rear faces of the teeth further comprise serrations along at least a part of their length.
Claim 12
Dependent Claim
17 words
A macerator as claimed in claim 9, wherein said serrations define an angle of 55° to 65°.
Claim 13
Dependent Claim
32 words
A macerator as claimed in claim 9, wherein the rear face of each tooth is arcuately convex for a portion of the length between the serrations and the tip of the tooth.
Claim 14
Dependent Claim
50 words
A macerator as claimed in claim 7, wherein there are an odd number of teeth, and wherein there is only one tooth which has its front face extending substantially parallel to the axis of the cutter, the remaining teeth having their front faces inclined to the axis of the cutter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |