US4309815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a housing for a small electrical machine
Assignee: Robert Bosch GmbH
•
Filing: 1979-02-28
•
Granted: 1982-01-12
•
Expires: 1999-02-28
Abstract
Abstract A housing for a small electrical machine, particularly a small electric motor, forms a part of the magnetic circuit of the same and is composed of a cylindrical wall of a magnetoconductive material and a sheet-metal strip which is also constituted by a magnetoconductive material and is bent about the cylindrical wall. A method of manufacturing of the housing includes the steps of bending a sheet-metal band so as to form the cylindrical wall, and bending the sheet-metal strip about the thus-bent sheet-metal band so that the latter serves as a mandrel. The sheet-metal band may be bent on a primary mandrel and temporarily retained on the latter so that the sheet-metal strip is then bent about the band when the latter is still retained on the primary mandrel. End portions of the sheet-metal band and the sheet-metal strip may be connected with one another along the same generatrix of the cylindrical wall.
Inventors
- 👤 Jakob Schmitt
- 👤 Willy Voit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:52
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K1/00; H02K1/06; H02K1/12; H02K1/17; H02K15/00; H02K15/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A method for manufacturing a housing for a small electrical machine, particularly a small electric motor with permanent magnets, the housing forming a part of the magnetic circuit of the electrical machine, the method comprising the steps of providing a cylindrical wall constituted by a magneto-conductive material; and placing a sheet-metal strip constituted by a magneto-conductive material onto said cylindrical wall and securing the sheet-metal strip in position on said cylindrical wall, said placing and securing being performed by bending of said sheet-metal strip about said cylindrical wall so that the latter serves as a mandrel.
Claim 2
Independent Claim
96 words
A method for manufacturing a housing for a small electrical machine, particularly a small electric motor with permanent magnets, the housing forming a part of the magnetic circuit of the electrical machine, the method comprising the steps of providing a cylindrical wall constituted by a magneto-conductive material; and placing a sheet-metal strip constituted by a magneto-conductive material onto said cylindrical wall and securing the sheet-metal strip in position on said cylindrical wall, said placing and securing being performed by bending of said sheet-metal strip about said cylindrical wall so that the latter serves as a mandrel.
Claim 3
Dependent Claim
39 words
A method as defined in claim 1, wherein said providing step includes forming the cylindrical wall by bending a sheet-metal band, said step of bending the sheet-metal strip being performed by bending the latter about the thus-bent sheet-metal band.
Claim 4
Dependent Claim
47 words
A method as defined in claim 2, wherein the cylindrical wall has a generatrix, and the sheet-metal band forming the cylindrical wall has two end portions; and further comprising the step of connecting the end portions of the sheet-metal band with one another lengthwise of the generatrix.
Claim 5
Dependent Claim
47 words
A method as defined in claim 2, wherein said cylindrical wall has a generatrix, and the sheet-metal strip has two end sections; and further comprising the step of connecting said end sections of the sheet-metal strip with one another lengthwise of the generatrix of the cylindrical wall.
Claim 6
Dependent Claim
38 words
A method as defined in claim 3, wherein the sheet-metal strip has two end sections; and further comprising the step of connecting the end sections of the sheet-metal strip lengthwise of the same generatrix of the cylindrical wall.
Claim 7
Dependent Claim
34 words
A method as defined in claim 3, wherein said step of connecting the end portions of the sheet-metal band includes providing engaging formations on the end portions and interengaging the formations with each other.
Claim 8
Dependent Claim
37 words
A method as defined in claim 4, wherein said step of connecting the end sections of the sheet-metal strip with one another includes providing engaging formations on the end sections and interengaging the formations with each other.
Claim 9
Dependent Claim
59 words
A method as defined in claim 2, wherein the step of forming the cylindrical wall includes bending the sheet-metal band about a primary mandrel and retaining the thus-bent sheet metal band on the latter, said step of bending the sheet-metal strip including bending the same about the thus-bent sheet-metal band when the latter is retained on the primary mandrel.
Claim 10
Dependent Claim
55 words
A method as defined in claim 6, wherein the step of bending the sheet-metal band includes bending the same about a body provided with holding means on an edge section of the latter, and gradually engaging the holding means of the body with the formations of the sheet-metal band during bending of the sheet-metal band.
Claim 11
Dependent Claim
21 words
A method as defined in claim 1, wherein said bending step includes forming the sheet-metal strip of a Sendzimir-zinc-plated iron sheet.
Claim 12
Dependent Claim
21 words
A method as defined in claim 1, wherein said providing step includes forming the cylindrical wall of a Sendzimir-zinc-plated iron sheet.
Claim 13
Dependent Claim
76 words
A method as defined in claim 1, wherein said providing step includes forming the cylindrical wall so that it has an axis and is of a predetermined width, said bending step including forming the sheet-metal strip of a width which is smaller than the width of the cylindrical wall, so that after bending of the sheet-metal strip about the cylindrical wall, only a portion of width of the cylindrical wall is surrounded by the sheet-metal strip.
References Cited (Backward Citations)
US1812748A
Cited
US1833747A
Cited
US3131462A
Cited
US3818585A
Cited
US3878802A
Cited
US4074159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |