Patent US4378093A successfully refreshed from Google Patents.
US4378093A
Expired / Lapsed
US
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Grinder pump cutter assembly
Assignee: Individual
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Filing: 1980-12-11
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Granted: 1983-03-29
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Expires: 2000-12-11
Abstract
Abstract A grinder pump cutter assembly having a pair of cutting blades mounted on the cutter disk which extend at a hook angle to substantially the center of the disk. The blade is multi-surfaced, with the surfaces thereof being angled toward the periphery of the disk to break up centralized matter and disperse it into cutting engagement between the disk and cutter ring. Both the disk and cutter ring are also characterized by bores passing through juxtaposed circumferences thereof. The bores each have a hook angle associated therewith to define the sharpness of the cutting edges and to further provide a turbulence of self-purging action within the bores.
Inventors
- 👤 Steven M. Keener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:14
CPC Classifications
B; B02; B02C; B02C18/00; B02C18/0084; B02C18/0092; F; F04; F04D; F04D7/00; F04D7/02; F04D7/04; F04D7/045
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
In a grinder pump, the improvement of a cutter assembly, comprising: a cutter ring having a plurality of bores extending through an inner circumference thereof, the centers of said bores lying on a circle of greater radius than the radius of said inner circumference of said ring; and a disk received by and rotatable within said cutter ring, said disk being maintained upon a shaft and having a pair of blades depending therefrom, said blades extending from an outer circumference of said disk inwardly to said shaft, said disk having a pair of bores passing through said outer circumference of said disk, the centers of said pair of bores lying on a circle having a radius less than the radius of said outer circumference of said disk.
Claim 2
Dependent Claim
127 words
In a grinder pump, the improvement of a cutter assembly, comprising: a cutter ring having a plurality of bores extending through an inner circumference thereof, the centers of said bores lying on a circle of greater radius than the radius of said inner circumference of said ring; and a disk received by and rotatable within said cutter ring, said disk being maintained upon a shaft and having a pair of blades depending therefrom, said blades extending from an outer circumference of said disk inwardly to said shaft, said disk having a pair of bores passing through said outer circumference of said disk, the centers of said pair of bores lying on a circle having a radius less than the radius of said outer circumference of said disk.
Claim 3
Dependent Claim
23 words
The cutter assembly as recited in claim 1 wherein said bores of said disk are diametrically opposed and spaced equidistant between said blades.
Claim 4
Dependent Claim
22 words
The cutter assembly as recited in claim 1 wherein said blades are multisurfaced, the surfaces thereof being angled toward said outer circumference.
Claim 5
Dependent Claim
24 words
The cutter assembly as recited in claim 3 wherein said blades form a hook angle of approximately 10° with a diameter of said disk.
Claim 6
Dependent Claim
49 words
The cutter assembly as recited in claim 4 wherein each said blade includes a back surface sloped from said shaft toward said outer circumference of said disk, said back surface intersecting primary and secondary top surfaces of said blades, each said top surface being sloped toward said outer circumference.
Claim 7
Dependent Claim
27 words
The cutter assembly as recited in claim 5 wherein said primary and secondary top surfaces intersect said back surface at respective approximate angles of 30° and 45°.
Claim 8
Dependent Claim
111 words
A cutter assembly for a grinder pump, comprising: a cutter ring having a plurality of bores about an inner periphery thereof; and a disk maintained upon a shaft and rotatable within said ring, said disk having a pair of bores about the circumference thereof and further having a pair of blades extending from the bottom thereof, each said blade having a back surface sloped toward said circumference of said disk and beginning at said shaft, wherein said blades are maintained upon said disk at a hook angle, and wherein each said blade further includes primary and secondary top surfaces intersecting said back surface and sloping toward the circumference of said disk.
Claim 9
Dependent Claim
111 words
A cutter assembly for a grinder pump, comprising: a cutter ring having a plurality of bores about an inner periphery thereof; and a disk maintained upon a shaft and rotatable within said ring, said disk having a pair of bores about the circumference thereof and further having a pair of blades extending from the bottom thereof, each said blade having a back surface sloped toward said circumference of said disk and beginning at said shaft, wherein said blades are maintained upon said disk at a hook angle, and wherein each said blade further includes primary and secondary top surfaces intersecting said back surface and sloping toward the circumference of said disk.
Claim 10
Dependent Claim
30 words
The cutter assembly of claim 7 wherein said bores of both said ring and disk are of a cylindrical nature, each such bore comprising more than one-half of a cylinder.
Claim 11
Dependent Claim
21 words
The cutter assembly of claim 8 wherein said primary and secondary top surfaces and said back surface obliquely intersect each other.
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) | 1986-03-28 | 1986-09-27 | 1987-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-28 | 1990-09-27 | 1991-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-28 | 1994-09-27 | 1995-03-29 | $7700.00 | Window Closed / Lapsed |