US3831048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearing assembly for power tools
Assignee: SINGER ACQUISITION HOLDINGS COMPANY 8 STAMFORD FORUM STAMFORD CT 06904 A DE CORP
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Filing: 1973-07-30
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Granted: 1974-08-20
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Expires: 1993-07-30
Abstract
Abstract A bearing assembly for a power tool, such as a drill, having a housing formed of plastic in which a universal motor is mounted. The motor has an armature and a stator, with the armature shaft disposed axially in the housing and having a fan affixed thereto. Cooling apertures are formed in the housing in axially spaced relationship to each other on either side of the fan to permit ventilating air to enter and to exit the housing to cool the motor. A first bearing journals one end of the armature shaft in the housing. An improved second bearing is disposed in the path of ventilating air to journal the other end of the armature shaft. The improved bearing includes a bearing sleeve and a plurality of circumferentially spaced radial support members formed integrally with and extending from the bearing sleeve to seat and to support the second bearing within the housing. A plurality of axial apertures are formed in superposition to the bearing sleeve about the support members to permit the flow of ventilating air therethrough to cool the second bearing and the housing.
Inventors
- 👤 R Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:33
CPC Classifications
F; F16; F16C; F16C37/00; F16C37/002; F16C33/00; F16C33/02; F16C33/04; F16C33/20; H; H02; H02K; H02K5/00; H02K5/04; H02K5/16; H02K5/167; H02K5/1672
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
173 words
A bearing assembly for a power tool comprising: a. a housing formed of plastic, b. a motor having a stator and an armature mounted in the housing, c. a shaft for the armature disposed axially in the housing and having a fan affixed thereto, d. apertures formed in the housing in axially spaced relationship on either side of the fan to permit ventilating air to enter and to exit the housing to cool the motor, e. a first bearing means connected in the housing to journal one end of the armature shaft, and f. a second bearing means disposed in the path of ventilating air, and including a bearing sleeve to journal the other end of the armature shaft, and a plurality of circumferentially spaced radial support members integrally formed with and extending from the bearing sleeve to center and to seat the second bearing means within the housing and to form a plurality of axial apertures through which ventilating air will flow to cool both the second bearing means and the housing.
Claim 2
Dependent Claim
173 words
A bearing assembly for a power tool comprising: a. a housing formed of plastic, b. a motor having a stator and an armature mounted in the housing, c. a shaft for the armature disposed axially in the housing and having a fan affixed thereto, d. apertures formed in the housing in axially spaced relationship on either side of the fan to permit ventilating air to enter and to exit the housing to cool the motor, e. a first bearing means connected in the housing to journal one end of the armature shaft, and f. a second bearing means disposed in the path of ventilating air, and including a bearing sleeve to journal the other end of the armature shaft, and a plurality of circumferentially spaced radial support members integrally formed with and extending from the bearing sleeve to center and to seat the second bearing means within the housing and to form a plurality of axial apertures through which ventilating air will flow to cool both the second bearing means and the housing.
Claim 3
Dependent Claim
80 words
The combination claimed in claim 1 wherein: a. the support members of the second bearing means include a support sleeve spaced radially outwardly of the bearing sleeve, and a plurality of radial webs interconnectIng the bearing sleeve and the support sleeve with a plurality of apertures formed to be bounded by the bearing sleeve, the support sleeve, and the radial webs, b. a recess formed in the housing, and c. the support sleeve mounted in the recess of the housing.
Claim 4
Dependent Claim
28 words
The combination claimed in claim 2 wherein: a. the plurality of apertures are formed in an arcuate shape to define an annular space interrupted by the radial webs.
Claim 5
Dependent Claim
28 words
The combination claimed in claim 1 wherein: a. means associated with the support members and the housing to render the second bearing means non-rotatively mounted in said housing.
Claim 6
Dependent Claim
83 words
The combination claimed in claim 4 wherein: a. the housing has a support portion and a cover portion to define a clam-shell structure, b. a pair of aligned recesses formed in the support portion and the cover portion of the housing, c. an axial slot formed in one of the recesses, and d. an axial projection formed on one of the support members for engagement in the axial slot of the recess to render the second bearing means nonrotatively mounted in the housing.
Claim 7
Dependent Claim
115 words
A one-piece bearing and support member for a housing of a power tool in which is mounted a universal motor of the stator armature type with a rotatable armature shaft journaled by a pair of axially spaced bearings, one of which is said bearing and support member which comprises: a. a pair of sleeve members radially spaced from each other, b. a bearing sleeve is defined by the inner sleeve, c. a support sleeve is defined by the outer sleeve, d. a plurality of radially extending webs interconnect the bearing sleeve and the support sleeve, and e. means formed on the support sleeve to engage the housing and render the bearing and support member non-rotative.
Claim 8
Dependent Claim
115 words
A one-piece bearing and support member for a housing of a power tool in which is mounted a universal motor of the stator armature type with a rotatable armature shaft journaled by a pair of axially spaced bearings, one of which is said bearing and support member which comprises: a. a pair of sleeve members radially spaced from each other, b. a bearing sleeve is defined by the inner sleeve, c. a support sleeve is defined by the outer sleeve, d. a plurality of radially extending webs interconnect the bearing sleeve and the support sleeve, and e. means formed on the support sleeve to engage the housing and render the bearing and support member non-rotative.
References Cited (Backward Citations)
US3051373A
Cited
US3080106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |