Patent US4810918A successfully refreshed from Google Patents.
US4810918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor shaft with corrosion resistant ferrule for pumps motor
Assignee: Flint and Walling Inc
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Filing: 1987-10-07
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Granted: 1989-03-07
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Expires: 2007-10-07
Abstract
Abstract A corrosion resistant ferrule secured to the end of a full carbon steel rotor shaft in order to reduce wear and corrosion of the sealing elements of the pump assembly, while enhancing the overall strength of the drive shaft. A threaded member is received in the end of the rotor shaft and ferrule in order to secure the pump impeller to the drive shaft. The corrosion resistant ferrule reduces manufacturing costs while allowing integral rotor shaft construction. The ferrule may be manufactured of stainless steel, plastic, or brass.
Inventors
- 👤 Paul T. Kachuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:17
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/043; H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K7/00; H02K7/14
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
91 words
A rotor shaft construction for a motor and pump assembly having a rotor shaft extending therethrough and drivably connected to an internal stator winding, said rotor shaft construction comprising: a ferrule made of a corrosion resistant material attached to a reduced diameter portion of said rotor shaft such that said rotor shaft has a substantially uniform diameter, said ferrule including an end wall abutting the end of said rotor shaft as said shaft is matingly received within said ferrule; and means for drivably connecting said rotor shaft to the pump assembly.
Claim 2
Dependent Claim
91 words
A rotor shaft construction for a motor and pump assembly having a rotor shaft extending therethrough and drivably connected to an internal stator winding, said rotor shaft construction comprising: a ferrule made of a corrosion resistant material attached to a reduced diameter portion of said rotor shaft such that said rotor shaft has a substantially uniform diameter, said ferrule including an end wall abutting the end of said rotor shaft as said shaft is matingly received within said ferrule; and means for drivably connecting said rotor shaft to the pump assembly.
Claim 3
Dependent Claim
62 words
The rotor shaft construction as defined in claim 1 wherein said ferrule includes an aperture formed in said end wall and said rotor shaft includes a partial axial bore formed in the end of said rotor shaft, said end aperture axially aligning with said partial axial bore of said rotor shaft, said connecting means extending through said aperture into said partial bore.
Claim 4
Dependent Claim
27 words
The rotor shaft construction as defined in claim 2 wherein said connecting means comprises a threaded member received in said partial axial bore through said ferrule aperture.
Claim 5
Dependent Claim
51 words
The rotor shaft construction as defined in claim 3 wherein said rotor shaft is made of a carbon steel and wherein said ferrule attaches to an end of said rotor shaft extending from the motor assembly, said ferrule covering substantially the entire length of rotor shaft extending from the motor assembly.
Claim 6
Dependent Claim
17 words
The rotor shaft construction as defined in claim 4 wherein said ferrule is made of stainless steel.
Claim 7
Dependent Claim
18 words
The rotor shaft construction as defined in claim 4 wherein said ferrule is made of a plastic material.
Claim 8
Dependent Claim
146 words
A rotor shaft construction for a motor and pump assembly having a rotor shaft extending therethrough and drivably connected to an internal stator winding, said rotor shaft construction comprising: a ferrule made of a corrosion resistant material attached to a reduced diameter portion of said motor shaft such that said rotor shaft has a substantially uniform diameter, said ferrule including a sleeve portion and an end wall portion, the end of said motor shaft abutting said end wall portion of said ferrule as said shaft is matingly received within said ferrule; and means for drivably connecting said rotor shaft construction to the pump assembly, said means comprising a threaded member threadably received within a partial axial bore formed in the end of said rotor shaft and through an end aperture formed in said end wall portion of said ferrule and axially aligned with said partial bore.
Claim 9
Dependent Claim
146 words
A rotor shaft construction for a motor and pump assembly having a rotor shaft extending therethrough and drivably connected to an internal stator winding, said rotor shaft construction comprising: a ferrule made of a corrosion resistant material attached to a reduced diameter portion of said motor shaft such that said rotor shaft has a substantially uniform diameter, said ferrule including a sleeve portion and an end wall portion, the end of said motor shaft abutting said end wall portion of said ferrule as said shaft is matingly received within said ferrule; and means for drivably connecting said rotor shaft construction to the pump assembly, said means comprising a threaded member threadably received within a partial axial bore formed in the end of said rotor shaft and through an end aperture formed in said end wall portion of said ferrule and axially aligned with said partial bore.
Claim 10
Dependent Claim
48 words
The rotor shaft construction as defined in claim 7 wherein said rotor shaft is made of a carbon steel for structural strength and said ferrule is made of a polished stainless steel whereby the entire extrinsic end of said motor shaft is provided with a stainless steel surface.
Claim 11
Dependent Claim
46 words
The rotor shaft construction as defined in claim 7 wherein said rotor shaft is made of a carbon steel for structural strength and said ferrule is made of a plastic material whereby the entire extrinsic end of said motor shaft is provided with a plastic surface.
Claim 12
Dependent Claim
35 words
The rotor shaft construction as defined in claim 7 wherein said ferrule is substantially the length of the extrinsic end of said rotor shaft, said ferrule adapted to engage seal means of the pump assembly.
Claim 13
Dependent Claim
130 words
In a motor and pump assembly having a rotor shaft extending therethrough from a stator winding in the motor assembly, the extrinsic end of the rotor shaft drivably connected to the pump assembly, an improved rotor shaft construction comprising: a stainless steel ferrule attached to a reduced diameter end portion of the rotor shaft such that the rotor shaft has a substantially uniform diameter, said ferrule including a sleeve portion and an end wall portion having an end aperture, said end wall portion of said ferrule abutting the end of the rotor shaft to align said end aperture with a partial axial bore formed in the rotor shaft, the partial axial bore and end aperture receiving a threaded member for drivably connecting the rotor shaft construction to the pump assembly.
Claim 14
Dependent Claim
130 words
In a motor and pump assembly having a rotor shaft extending therethrough from a stator winding in the motor assembly, the extrinsic end of the rotor shaft drivably connected to the pump assembly, an improved rotor shaft construction comprising: a stainless steel ferrule attached to a reduced diameter end portion of the rotor shaft such that the rotor shaft has a substantially uniform diameter, said ferrule including a sleeve portion and an end wall portion having an end aperture, said end wall portion of said ferrule abutting the end of the rotor shaft to align said end aperture with a partial axial bore formed in the rotor shaft, the partial axial bore and end aperture receiving a threaded member for drivably connecting the rotor shaft construction to the pump assembly.
Claim 15
Dependent Claim
31 words
The rotor shaft construction as defined in claim 11 wherein said stainless steel ferrule is polished to reduce frictional wear between the rotor shaft and seal means in the pump assembly.
Claim 16
Dependent Claim
103 words
A rotor shaft construction for a motor and pump assembly having a rotor shaft extending therethrough and drivably connected to an internal stator winding, said rotor shaft construction comprising: a plastic ferrule attached to a reduced diameter portion of said rotor shaft such that said rotor shaft has a substantially uniform diameter, said rotor shaft being made of a carbon steel; and means for drivably connecting said rotor shaft construction to the pump assembly, said means comprising a threaded member received within a partial axial bore of said rotor shaft and through an end aperture of said ferrule aligned with said axial bore.
Claim 17
Dependent Claim
103 words
A rotor shaft construction for a motor and pump assembly having a rotor shaft extending therethrough and drivably connected to an internal stator winding, said rotor shaft construction comprising: a plastic ferrule attached to a reduced diameter portion of said rotor shaft such that said rotor shaft has a substantially uniform diameter, said rotor shaft being made of a carbon steel; and means for drivably connecting said rotor shaft construction to the pump assembly, said means comprising a threaded member received within a partial axial bore of said rotor shaft and through an end aperture of said ferrule aligned with said axial bore.
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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) | 1992-03-06 | 1992-09-05 | 1993-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-06 | 1996-09-05 | 1997-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-06 | 2000-09-05 | 2001-03-07 | $7700.00 | Window Closed / Lapsed |