US3903440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housing for operated power tools
Assignee: Robert Bosch GmbH
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Filing: 1972-10-19
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Granted: 1975-09-02
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Expires: 1992-10-19
Abstract
Abstract A housing for use in hand operated power tools having an electromotor and elements driven thereby, as well as a method of making such a housing, is disclosed. The housing may be made entirely from rigid foam plastic, or it may be made in form of a thin-walled inner plastic housing which is surrounded by an outer housing of foam plastic.
Inventors
- 👤 Kurt Paule
- 👤 Gerhard Armbruster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:03
CPC Classifications
B; B23; B23B; B23B45/00; B23B45/001; B29; B29C; B29C65/00; B29C65/56; B29C65/562; B29C65/60; B29C65/606; B29C66/00; B29C66/70; B29C66/72; B29C66/727; F; F16; F16M; F16M1/00; B29C43/00; B29C51/00; B29C65/02; B29C66/50; B29C66/51; B29C66/54; B29C66/71
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
In a hand-operated power tool, a combination comprising an electromotor and elements driven thereby; and housing means at least partly enclosing and supporting said electromotor and said elements, said housing means including a self-supporting outer housing of rigid synthetic plastic material and having a foamed inner cellular core of said material which merges into a dense non-cellular outer skin of the same material as, and of one piece with, said inner cellular core.
Claim 2
Dependent Claim
73 words
In a hand-operated power tool, a combination comprising an electromotor and elements driven thereby; and housing means at least partly enclosing and supporting said electromotor and said elements, said housing means including a self-supporting outer housing of rigid synthetic plastic material and having a foamed inner cellular core of said material which merges into a dense non-cellular outer skin of the same material as, and of one piece with, said inner cellular core.
Claim 3
Dependent Claim
26 words
A combination as defined in claim 1, wherein said foam plastic forming said housing means has an inner cellular core and dense non-cellular outer surface regions.
Claim 4
Dependent Claim
25 words
A combination as defined in claim 1, wherein said housing means comprises two symmetrical shell sections of said material which are connectable to one another.
Claim 5
Dependent Claim
36 words
A combination as defined in claim 1; said housing means further comprising a thin-walled inner housing for at least partly enclosing the motor and the elements driven thereby, said outer housing surrounding said thin-walled inner housing.
Claim 6
Dependent Claim
17 words
A combination as defined in claim 4, wherein said thin-walled inner housing is of synthetic plastic material.
Claim 7
Dependent Claim
20 words
A combination as defined in claim 4, wherein said inner housing is composed of two shells which are welded together.
Claim 8
Dependent Claim
17 words
A combination as defined in claim 4, wherein said inner housing is composed of two deep-drawn shells.
Claim 9
Dependent Claim
17 words
A combination as defined in claim 4, wherein said inner housing is composed of two vacuum-formed shells.
Claim 10
Dependent Claim
17 words
A combination as defined in claim 4, wherein said inner housing is composed of two press-formed shells.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |