US3927569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of supervising the filling level in hoppers, shafts, silos and the like for miscellaneous materials and means for performing the method
Assignee: ABB Norden Holding AB
•
Filing: 1974-03-21
•
Granted: 1975-12-23
•
Expires: 1994-03-21
Abstract
Abstract For supervising the filling level in an elongated space, such as hoppers, shafts, silos and the like, for miscellaneous granular material, the movement of the material is transformed into vibrations and the vibrations are converted into indicating signals which indicate the filling level. This may be accomplished by a plurality of rods which extend through the wall of the space and are subjected to the vibrations produced by solid materials falling through the space. This may be done by providing rods which extend beyond the wall into the space, and by accelerometers or the like which detect the vibrations and convert them into electrical signals which may control the discharge from the shaft.
Inventors
- 👤 Sven-Gunnar Bergdahl
- 👤 Erik Torsten Wangdahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:28
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/0007
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
106 words
Method of supervising the filling level and downward movement of granular material in a vertically elongated space, which comprises pouring said material into said space past and in engagement with at least one sensing mechanism placed at a level substantially above the bottom of said space located in the downward path of said material, transforming the movement of the material engaging said sensing mechanism when falling down into said space into vibrations, converting said vibrations into indication signals denoting the falling of material past said sensing mechanism, whereby, when material in the space has reached a level above said sensing mechanism, substantially no vibration is transmitted.
Claim 2
Dependent Claim
106 words
Method of supervising the filling level and downward movement of granular material in a vertically elongated space, which comprises pouring said material into said space past and in engagement with at least one sensing mechanism placed at a level substantially above the bottom of said space located in the downward path of said material, transforming the movement of the material engaging said sensing mechanism when falling down into said space into vibrations, converting said vibrations into indication signals denoting the falling of material past said sensing mechanism, whereby, when material in the space has reached a level above said sensing mechanism, substantially no vibration is transmitted.
Claim 3
Dependent Claim
16 words
Method according to claim 1, which comprises transforming said movement of the material mechanically into vibrations.
Claim 4
Dependent Claim
25 words
Method according to claim 2, in which the sensing mechanism includes an elongated body influenced by the movement of the material to produce vibrations thereof.
Claim 5
Dependent Claim
20 words
Method according to claim 3, in which tHe body has its end in the path of movement of the material.
Claim 6
Dependent Claim
17 words
Method according to claim 3 which includes sensing oscillatory movements of the other end of the body.
Claim 7
Dependent Claim
36 words
Method according to claim 1, which includes transforming the movement of the material when it passes various levels in the space into individual indicating signals which indicate in stages how far the space has been filled.
Claim 8
Dependent Claim
134 words
Means for supervising the filling level and downward movement of granular material in a vertically elongated space, said space having a filling opening above the bottom thereof, comprising at least one sensing member arranged in the wall of said space above the bottom and located in the downward path of material fed into said space through said filling opening, whereby such material will come into contact with the member when falling down into the space as long as the level of the material in the space is below said member, said member being provided with vibration transmitting means responsive to the fall of material against said member when passing into said space, and an indicating mechanism connected to said vibration transmitting means to indicate the movement of material and filling level in the space.
Claim 9
Dependent Claim
134 words
Means for supervising the filling level and downward movement of granular material in a vertically elongated space, said space having a filling opening above the bottom thereof, comprising at least one sensing member arranged in the wall of said space above the bottom and located in the downward path of material fed into said space through said filling opening, whereby such material will come into contact with the member when falling down into the space as long as the level of the material in the space is below said member, said member being provided with vibration transmitting means responsive to the fall of material against said member when passing into said space, and an indicating mechanism connected to said vibration transmitting means to indicate the movement of material and filling level in the space.
Claim 10
Dependent Claim
20 words
Means according to claim 7, in which said member comprises a sensing member which is mechanically influenced by the material.
Claim 11
Dependent Claim
26 words
Means according to claim 8, in which the sensing member is located at least partially in the path of movement of the material in the space.
Claim 12
Dependent Claim
22 words
Means according to claim 8, in which the sensing member is in indirect communication with the path of movement of the material.
Claim 13
Dependent Claim
29 words
Means according to claim 7, in which the sensing member comprises an elongated body, one end of which is at least indirectly influenced by the movement of the material.
Claim 14
Dependent Claim
20 words
Means according to claim 11, in which the other end of the elongated body is connected with the indicating mechanism.
Claim 15
Dependent Claim
36 words
Means according to claim 7, in which a plurality of members caused to vibrate by the movement of the material are located at various levels along the space, each bieng connected to its own indicating instrument.
References Cited (Backward Citations)
US910606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |