GB323131A - Improved magnetic speedometer - Google Patents
Improved magnetic speedometerInfo
- Publication number
- GB323131A GB323131A GB197629A GB197629A GB323131A GB 323131 A GB323131 A GB 323131A GB 197629 A GB197629 A GB 197629A GB 197629 A GB197629 A GB 197629A GB 323131 A GB323131 A GB 323131A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- drag element
- shaft
- spindle
- armature
- 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
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/49—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents
- G01P3/495—Devices characterised by the use of electric or magnetic means for measuring angular speed using eddy currents where the indicating means responds to forces produced by the eddy currents and the generating magnetic field
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
323,131. Marks, Sir G. C., (A.C. Spark Plug Co.). Jan. 21, 1929. Electric and magnetic speed indicators.- Relates to instruments having a rotary magnet and a fixed cup armature between which is arranged a drag element, and consists in making the magnet of bar form. A vertical shaft 3 journaled in a frame 1 is adapted for connection to a driving shaft. A worm 5 and gear 7 drive the usual odometer. A clip 9 secures the shaft 3 against endwise movement. Upon a reduced part of the shaft is pressed a bar magnet 13 made up of several bar magnets secured together. A fixed cup-shaped armature 8 is carried by the frame. The drag element 20 is carried by a spindle 21 carried at one end in a rotating bearing 23 and mounted in a fixed bearing 24 at the other end. A stop 26 limits upward movement of the spindle. A hair spring 27 brings the spindle back to its zero position. The drag element is graduated and a pointer is provided on a cut-away portion of the armature. Pole pieces 37 may be mounted to slide longitudinally on the magnet and connected by U-shaped bimetallic strips to a centre plate 45 so that the air-gap between the magnet and the drag element is varied to compensate for temperature variations. 'The top bearing may be provided with a gland packed with fine cotton to check unsteadiness in the indicating needle.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US140198A US1857674A (en) | 1926-10-07 | 1926-10-07 | Speedometer with rotating magnet |
| GB197629A GB323131A (en) | 1929-01-21 | 1929-01-21 | Improved magnetic speedometer |
| FR669286D FR669286A (en) | 1929-01-21 | 1929-02-07 | Rotating magnet speedometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB197629A GB323131A (en) | 1929-01-21 | 1929-01-21 | Improved magnetic speedometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB323131A true GB323131A (en) | 1929-12-24 |
Family
ID=9731367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB197629A Expired GB323131A (en) | 1926-10-07 | 1929-01-21 | Improved magnetic speedometer |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR669286A (en) |
| GB (1) | GB323131A (en) |
-
1929
- 1929-01-21 GB GB197629A patent/GB323131A/en not_active Expired
- 1929-02-07 FR FR669286D patent/FR669286A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR669286A (en) | 1929-11-14 |
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