US3650481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinder pump
Assignee: HYDR O MATIC PUMP CO
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Filing: 1971-04-01
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Granted: 1972-03-21
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Expires: 1991-04-01
Abstract
Abstract The grinder pump includes an electric motor drive, cooperating cutter blade and grinder members one of which is secured to the motor shaft at an inlet for the grinder pump unit, an axial flow inducer impeller axially inwardly of and immediately adjacent to the cooperating cutter blade and grinder members, and a centrifugal pump means having an inlet directly connecting to and receiving the discharge from the axial flow inducer impeller, all of the driven members being controlled by and carried on the shaft of the electric motor.
Inventors
- 👤 William J Conery
- 👤 Donald A Kaessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:11
CPC Classifications
F; F04; F04D; F04D7/00; F04D7/02; F04D7/04; F04D7/045; B; B02; B02C; B02C18/00; B02C18/0084; B02C18/0092
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
94 words
A grinder pump comprising an electric motor means including a shaft extending therefrom, an inlet being provided for said housing, cooperating cutter blade and grinder means members one of which is secured to said shaft at an inlet for the unit, an axial flow inducer impeller positioned axially inwardly of and immediately adjacent said cutter blade member, said impeller being secured to said shaft, and a centrifugal pump means including an impeller secured to said shaft, said pump having an inlet directly connecting to and receiving the discharge from said axial flow inducer impeller.
Claim 2
Dependent Claim
94 words
A grinder pump comprising an electric motor means including a shaft extending therefrom, an inlet being provided for said housing, cooperating cutter blade and grinder means members one of which is secured to said shaft at an inlet for the unit, an axial flow inducer impeller positioned axially inwardly of and immediately adjacent said cutter blade member, said impeller being secured to said shaft, and a centrifugal pump means including an impeller secured to said shaft, said pump having an inlet directly connecting to and receiving the discharge from said axial flow inducer impeller.
Claim 3
Dependent Claim
23 words
A grinder pump unit as in claim 1 where teeth are provided on said grinder means and some teeth are longer than others.
Claim 4
Dependent Claim
46 words
A grinder pump as in claim 1 where said grinder means has an odd number of teeth therein and every other one of said teeth is radially shorter than the teeth adjacent thereto, except for one pair of adjacent teeth which are of the same length.
Claim 5
Dependent Claim
40 words
A grinder pump unit as in claim 1 where said axial flow inducer impeller has teeth thereon extending the axial length thereof and surfaces of said teeth cooperate with surfaces of said grinder teeth for additional cutting and/or grinding action.
Claim 6
Dependent Claim
116 words
A grinder pump unit comprising a housing and electric motor means, said electric motor including a shaft extending therefrom, an inlet being provided for said housing, an inlet cutter blade secured to said shaft, grinder ring means including grinder teeth carried by said housing and encompassing said inlet cutter blade, an axial flow inducer impeller positioned axially inwardly of and immediately adjacent said inlet cutter blade, said impeller being secured to said shaft, a centrifugal pump means within said housing and including an impeller secured to said shaft, said pump having an inlet directly connecting to and receiving the discharge from said axial flow inducer impeller, and a discharge means for said pump means connecting thereto.
Claim 7
Dependent Claim
116 words
A grinder pump unit comprising a housing and electric motor means, said electric motor including a shaft extending therefrom, an inlet being provided for said housing, an inlet cutter blade secured to said shaft, grinder ring means including grinder teeth carried by said housing and encompassing said inlet cutter blade, an axial flow inducer impeller positioned axially inwardly of and immediately adjacent said inlet cutter blade, said impeller being secured to said shaft, a centrifugal pump means within said housing and including an impeller secured to said shaft, said pump having an inlet directly connecting to and receiving the discharge from said axial flow inducer impeller, and a discharge means for said pump means connecting thereto.
Claim 8
Dependent Claim
37 words
A grinder pump unit as in claim 5 where some of said grinder teeth on said grinder ring means are radially longer than others, and where radially outwardly extending circular recesses are formed between said grinder teeth.
Claim 9
Dependent Claim
47 words
A grinder pump as in claim 5 where said grinder ring means has an odd number of teeth therein and every other one of said teeth is radially shorter than the teeth adjacent thereto, except for one pair of adjacent teeth which are of the same length.
Claim 10
Dependent Claim
47 words
A grinder pump unit as in claim 5 where said axial flow inducer impeller has teeth thereon extending the axial length thereof and flat end surfaces are formed on said teeth to cooperate with end surfaces of said grinder ring teeth for additional cutting and/or grinding action.
Claim 11
Dependent Claim
13 words
A grinder pump unit as in claim 1 where said motor is submersible.
Claim 12
Dependent Claim
25 words
A grinder pump unit as in claim 9 where said motor has two axially spaced seals with an oil chamber formed therein between said seals.
Claim 13
Dependent Claim
54 words
A grinder pump unit as in claim 1 where said axial flow inducer impeller, which is of disc shape, has teeth thereon extending the axial length thereof and end surfaces of said teeth are flat and said axial flow inducer impeller can be reversed for double use of said impeller without sharpening its teeth.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |