GB540399A - Improvements in electric remote indication devices - Google Patents
Improvements in electric remote indication devicesInfo
- Publication number
- GB540399A GB540399A GB12293/40A GB1229340A GB540399A GB 540399 A GB540399 A GB 540399A GB 12293/40 A GB12293/40 A GB 12293/40A GB 1229340 A GB1229340 A GB 1229340A GB 540399 A GB540399 A GB 540399A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shaft
- instrument
- rotor
- posts
- hollow
- 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
- G01R5/00—Instruments for converting a single current or a single voltage into a mechanical displacement
- G01R5/14—Moving-iron instruments
- G01R5/16—Moving-iron instruments with pivoting magnet
Abstract
540,399. Combinations of instruments current measurements. BRITISH THOMSON-HOUSTON CO., Ltd. July 29, 1940, No. 12293. Convention date, July 29, 1939. [Class 37] A pair of instruments 11, 12 are mounted with their moving systems coaxial, the shaft 27 of one instrument passing through a hollow rotor 33 and hollow shaft 39 of the other instrument. The instrument 12 comprises a circular base 15 from which project posts 16. Secured to the base is a stationary field magnet comprising a laminated core 17 carrying field coils 18. The rotor 20 is a transversely magnetized cylindrical permanent magnet made from a mixture of powdered magnetite, ferric oxide, and cobaltic oxide moulded under pressure and mounted on the shaft 27. A jewelled end bearing is mounted in a screw 21 carried by a plate 22 which is fastened to the posts 16. A copper or aluminium damping cylinder 19 surrounds the rotor 20 and is pressed against the base 15 by a dished spring washer 23. The instrument 11 has a base 29, posts 30, magnet core 31, field coils 32, and magnetic rotor 33 similar to the corresponding parts of the instrument 12. The damping cylinder 34 is in the form of a cup having a flange 35 by which it is attached to a plate 36 screwed to the posts 30. The hollow shaft 39 includes stub shafts 40, 41 with conical portions engaging ball bearings 44, 45 and a hollow spindle 46 which has a portion 47 of greater diameter than the bore in the rotor 33 and a portion 48 fitting the bore in the rotor and extending into the stub shaft 41. The stub shaft 40 is secured to the spindle 46 by a sleeve 51. A ring jewel 55 is set in the sleeve 51 between the stub shaft 40 and the portion 47 of the hollow spindle 46 and forms a bearing for the shaft 27 of the instrument 12. A collar 56 is secured to the shaft 27 to bear against the jewel 55 and serve as an end thrust bearing. Pointers 61, 62 are attached to the ends of the shafts 27, 39 and co-operate with concentric scales on a scale plate 58.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US540399XA | 1939-07-29 | 1939-07-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB540399A true GB540399A (en) | 1941-10-15 |
Family
ID=21988388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12293/40A Expired GB540399A (en) | 1939-07-29 | 1940-07-29 | Improvements in electric remote indication devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB540399A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2700898A (en) * | 1950-01-12 | 1955-02-01 | Sperry Corp | Compound indicating instrument |
-
1940
- 1940-07-29 GB GB12293/40A patent/GB540399A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2700898A (en) * | 1950-01-12 | 1955-02-01 | Sperry Corp | Compound indicating instrument |
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