US3875436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double insulated vacuum cleaner motor housing
Assignee: Scott Fetzer Co
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Filing: 1973-07-16
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Granted: 1975-04-01
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Expires: 1993-07-16
Abstract
Abstract A vacuum cleaner motor housing providing a second insulating barrier between the functional insulation of the vacuum motor and the conducting base of a vacuum shroud used to produce the cleaning suction. The conducting base section forms a part of the motor housing with a protruding cylindrical sleeve into whose inner bore a non-conducting section forming the remaining part of the housing is mounted. The non-conducting section encloses the functional insulation of the vacuum motor, including the brush contacts for the commutator, armature windings, and field windings, in one preformed molded piece, thereby insulating them from the conducting section. The non-conducting molded section also has a plurality of deformable ribs on each of three mounting surfaces to ensure a coaxial relationship of the armature and field cores of the motor and to facilitate manufacture and assembly.
Inventors
- 👤 Charles H Macfarland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:09
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/28; A47L9/2889; A47L5/00; A47L5/12; H; H02; H02K; H02K5/00; H02K5/04; H02K5/14; H02K5/143; H02K5/148
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
238 words
A vacuum cleaner comprising a metal housing assembly providing a bearing support wall extending radially inward to a first bearing support portion, a fan shroud adjacent one side of said bearing support wall and an extension having generally cylindrical inner wall portion extending from said bearing support wall on the other side thereof; a unitary non-conducting motor housing having a cylindrical portion telescoping into said cylindrical inner wall portion and being laterally supported thereby, said motor housing providing a central portion adjacent said cylindrical portion having brush holders therein and a second bearing support portion on the side of said central portion remote from said cylindrical portion; a motor field core mounted within said cylindrical portion and enclosed thereby; an armature assembly including the shaft supporting a main fan within said shroud; a first bearing in said first bearing support portion journaling said shaft adjacent said main fan; a second bearing in said second bearing support portion journaling said shaft adjacent the end thereof; an armature on said shaft within said field; a commutator on said shaft within said brush holders; and a sleeve of insulating material electrically insulating said shaft from said armature and commutator; said metal housing assembly supporting said motor housing to a location substantially adjacent to said commutator; said metal housing assembly and said motor housing providing sufficient strength to withstand impact loads occurring when objects are pulled into and engage said main fan.
Claim 2
Dependent Claim
238 words
A vacuum cleaner comprising a metal housing assembly providing a bearing support wall extending radially inward to a first bearing support portion, a fan shroud adjacent one side of said bearing support wall and an extension having generally cylindrical inner wall portion extending from said bearing support wall on the other side thereof; a unitary non-conducting motor housing having a cylindrical portion telescoping into said cylindrical inner wall portion and being laterally supported thereby, said motor housing providing a central portion adjacent said cylindrical portion having brush holders therein and a second bearing support portion on the side of said central portion remote from said cylindrical portion; a motor field core mounted within said cylindrical portion and enclosed thereby; an armature assembly including the shaft supporting a main fan within said shroud; a first bearing in said first bearing support portion journaling said shaft adjacent said main fan; a second bearing in said second bearing support portion journaling said shaft adjacent the end thereof; an armature on said shaft within said field; a commutator on said shaft within said brush holders; and a sleeve of insulating material electrically insulating said shaft from said armature and commutator; said metal housing assembly supporting said motor housing to a location substantially adjacent to said commutator; said metal housing assembly and said motor housing providing sufficient strength to withstand impact loads occurring when objects are pulled into and engage said main fan.
Claim 3
Dependent Claim
46 words
A vacuum cleaner as set forth in claim 1 wherein said motor housing includes circumferentially spaced deformable means adapted to deform at adjacent areas of engagement between said cylindrical portion of said non-conducting motor housing and said cylindrical inner wall portion of said metal housing assembly.
Claim 4
Dependent Claim
38 words
A vacuum cleaner as set forth in claim 2 wherein said non-conducting motor housing includes second circumferentially spaced deformable means adapted to deform at adjacent areas of engagement between said cylindrical portion thereof and said motor field core.
Claim 5
Dependent Claim
37 words
A vacuum cleaner as set forth in claim 3 wherein said non-conducting motoR housing includes third deformable circumferentially spaced means adapted to deform at adjacent areas of engagement between said second bearing support and said second bearing.
Claim 6
Dependent Claim
38 words
A vacuum cleaner as set forth in claim 4 wherein said first, second and third deformable means are substantially identical and comprise deformable ribs having a longitudinal axis parallel to the central axis of said non-conducting motor housing.
Claim 7
Dependent Claim
37 words
A vacuum cleaner as set forth in claim 5 wherein a second fan is mounted on said shaft within said generally cylindrical inner wall portion of said metal housing and spaced from said unitary non-conducting motor housing.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |