Patent US3845336A successfully refreshed from Google Patents.
US3845336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing and housing construction
Assignee: Black and Decker Corp
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Filing: 1970-10-01
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Granted: 1974-10-29
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Expires: 1990-10-01
Abstract
Abstract A portable electric device comprising a housing having an electric motor disposed therein. The motor includes a rotatable shaft carried by bearings supported upon the housing. The housing includes a portion supporting at least one of the bearings and formed from an electrically insulating material, which also has low thermal conductivity. In order to insure adequate cooling of this bearing, this housing portion is constructed to facilitate the passage of cooling air around and past the one bearing during operation of the motor.
Inventors
- 👤 L Alsruhe
- 👤 R Moores
- 👤 L Mccafferty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:03
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/173; H02K5/1732; F; F16; F16C; F16C35/00; F16C35/04; F16C35/06; F16C35/067; F16C35/07; F16C35/077; F16C37/00; F16C37/007; F16C19/00; F16C19/02; F16C19/04; F16C19/06; F16C2380/00; F16C2380/26
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
An electric motor comprising a housing including a member constructed of electrically insulating, low thermal conductivity material, a stationary field supported within said housing, a rotatable armature supported within said field and including an armature shaft, a fan driven by said motor and adapted to draw cooling air through said motor, a bearing rotatably supporting said armature shaft, said housing member having a recess defined by a generally annular surface having arcuately spaced slots therein, said bearing being snugly receivable within said recess and adapted to engage said annular surface, said slots extending the entire axial length of said bearing and communicating with said fan, opening means of said housing member communicating the atmosphere with said slots, whereby said cooling air is drawn through said opening means and said slots and over said bearing.
Claim 2
Dependent Claim
134 words
An electric motor comprising a housing including a member constructed of electrically insulating, low thermal conductivity material, a stationary field supported within said housing, a rotatable armature supported within said field and including an armature shaft, a fan driven by said motor and adapted to draw cooling air through said motor, a bearing rotatably supporting said armature shaft, said housing member having a recess defined by a generally annular surface having arcuately spaced slots therein, said bearing being snugly receivable within said recess and adapted to engage said annular surface, said slots extending the entire axial length of said bearing and communicating with said fan, opening means of said housing member communicating the atmosphere with said slots, whereby said cooling air is drawn through said opening means and said slots and over said bearing.
Claim 3
Dependent Claim
24 words
A motor as defined in claim 1 wherein said housing member encloses and supports said motor field, said fan being fixed to said shaft.
Claim 4
Dependent Claim
17 words
A motor as defined in claim 1 wherein said housing member is constructed from a thermoplastic material.
Claim 5
Dependent Claim
34 words
A motor as defined in claim 1 wherein said slots extend substAntially the entire axial length of said recess, said opening means including at least one opening in said member communicated with said recess.
Claim 6
Dependent Claim
30 words
A motor as defined in claim 4 wherein said bearing is spaced from the bottom of said recess and defines therewith a clearance space communicating said opening and said slots.
Claim 7
Dependent Claim
29 words
A motor as defined in claim 4 wherein said bearing extends substantially the entire axial length of said recess, said opening means including an opening communicated with each recess.
Claim 8
Dependent Claim
91 words
A bearing assembly comprising a rigid member constructed from an electrically insulating material having relatively low thermal conductivity, a blind bore in said member, said bore having a generally annular surface with axially extending, arcuately spaced slots therein, at least one opening in the end wall of said member communicating with said slots, a bearing received within said bore and snugly engaging said annular surface, said slots extending the entire axial length of said bearing, whereby cooling air may pass through said opening means and said slots to cool said bearing.
Claim 9
Dependent Claim
91 words
A bearing assembly comprising a rigid member constructed from an electrically insulating material having relatively low thermal conductivity, a blind bore in said member, said bore having a generally annular surface with axially extending, arcuately spaced slots therein, at least one opening in the end wall of said member communicating with said slots, a bearing received within said bore and snugly engaging said annular surface, said slots extending the entire axial length of said bearing, whereby cooling air may pass through said opening means and said slots to cool said bearing.
Claim 10
Dependent Claim
29 words
A bearing support as defined in claim 7 which includes a plurality of openings in said end wall, each of which communicates with a corresponding one of said slots.
Claim 11
Dependent Claim
16 words
A bearing support as defined in claim 7 wherein said support is constructed of thermoplastic material.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |