US4638196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand-held tool with an electric motor and wearing shells for supporting the same
Assignee: Robert Bosch GmbH
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Filing: 1985-03-18
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Granted: 1987-01-20
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Expires: 2005-03-18
Abstract
Abstract In a hand-held machine tool, a housing formed of two shells accommodates an electric motor, a motor bearing assembly and electric structural components. A brush-side motor bearing includes a bearing support which carries thereon the electric structural components, such as carbon brush holders, chokes for spark quenching, an inductive receiver and light-emitting diodes. The bearing support can be preassembled with these structural components outside the housing and inserted into one of the housing shells.
Inventors
- 👤 Ernst Kranzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:06
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/02; H02K11/026; H02K23/00; H02K23/66; H02K5/00; H02K5/04; H02K5/14; H02K5/143; H02K5/148; H02K5/16; H02K5/167; H02K5/1672
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A hand-held machine tool including a housing having housing shells connectable to each other, an electric motor, and a split motor bearing accommodated in said housing and including a lower shell half and an upper shell half connectable to an disconnectable from said lower shell half, both shell halves supporting in assembly a brush-side end of a motor shaft; and electric structural components, said lower shell half being secured in said housing and remaining therein whereas said upper shell half is simultaneously a carrier for supporting said electric structural components and forms with said electric structural components a pre-assembled integral component assembly removable from and insertable into said housing.
Claim 2
Dependent Claim
109 words
A hand-held machine tool including a housing having housing shells connectable to each other, an electric motor, and a split motor bearing accommodated in said housing and including a lower shell half and an upper shell half connectable to an disconnectable from said lower shell half, both shell halves supporting in assembly a brush-side end of a motor shaft; and electric structural components, said lower shell half being secured in said housing and remaining therein whereas said upper shell half is simultaneously a carrier for supporting said electric structural components and forms with said electric structural components a pre-assembled integral component assembly removable from and insertable into said housing.
Claim 3
Dependent Claim
32 words
The machine tool as defined in claim 1, wherein said upper shell half carries carbon brush holders, carbon brush insertable into said holders and choke coils for spark shielding and spark quenching.
Claim 4
Dependent Claim
30 words
The machine tool as defined in claim 2, wherein said upper shell half carries an inductive receiver for a device for controlling the number of revolutions of said electric motor.
Claim 5
Dependent Claim
27 words
The machine tool as defined in claim 3, wherein said upper shell half carries light-emitting diodes for indicating the electrically switchable number of revolutions of said motor.
Claim 6
Dependent Claim
17 words
The machine tool as defined in claim 4, wherein said upper shell half portions of plug contacts.
Claim 7
Dependent Claim
23 words
The machine tool as defined in claim 2, wherein the carbon brushes are connectable to respective choke coils in said upper shell half.
References Cited (Backward Citations)
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |