GB174299A - Improvements in casings for voltmeters, ammeters and similar instruments - Google Patents
Improvements in casings for voltmeters, ammeters and similar instrumentsInfo
- Publication number
- GB174299A GB174299A GB910721A GB910721A GB174299A GB 174299 A GB174299 A GB 174299A GB 910721 A GB910721 A GB 910721A GB 910721 A GB910721 A GB 910721A GB 174299 A GB174299 A GB 174299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- tube
- subsequently
- dies
- expanded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
174,299. Tubes, Ltd., and Lines, E. W. P. March 24, 1921. Drawings to Specification. Hollow-ware.-Instrument casings comprise a body formed of a piece of tube with an integral attachment flange to the interior of which a sheetmetal back-plate is secured. Ordinary methods of securing the back-plate may be used, but the following methods are preferred. For small cases the tube may be expanded for a short distance during the flanging, and the back-plate is secured by subsequently pressing back the tube by a ring die with the plate in position. For larger work the tube may be expanded from the end remote from the flange and subsequently restored to original size by an external die or dies when the plate is in position. Or the plate may be distorted to conical shape before insertion and subsequently pressed flat between dies. The material used is preferably steel. The back-plate may be formed with peripheral flats to provide ventilation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB910721A GB174299A (en) | 1921-03-24 | 1921-03-24 | Improvements in casings for voltmeters, ammeters and similar instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB910721A GB174299A (en) | 1921-03-24 | 1921-03-24 | Improvements in casings for voltmeters, ammeters and similar instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB174299A true GB174299A (en) | 1922-01-26 |
Family
ID=9865478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB910721A Expired GB174299A (en) | 1921-03-24 | 1921-03-24 | Improvements in casings for voltmeters, ammeters and similar instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB174299A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454466A (en) * | 2012-06-02 | 2013-12-18 | 广东佰林电气设备厂有限公司 | Ventilation hole protection device used for electric meter box |
-
1921
- 1921-03-24 GB GB910721A patent/GB174299A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103454466A (en) * | 2012-06-02 | 2013-12-18 | 广东佰林电气设备厂有限公司 | Ventilation hole protection device used for electric meter box |
| CN103454466B (en) * | 2012-06-02 | 2016-05-11 | 广东佰林电气设备厂有限公司 | A kind of ammeter box air hole protecting device |
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