Patent US4281731A successfully refreshed from Google Patents.
US4281731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic force-compensating precision weigher with dither
Assignee: Sartorius AG
•
Filing: 1980-05-08
•
Granted: 1981-08-04
•
Expires: 2000-05-08
Abstract
Abstract An electromagnetic force-compensating weigher with a load supporting device resiliently supported by resilient joints and movable between stops, wherein electric circuitry is connected to produce a slowly decaying mechanical oscillation upon the load supporting device, to thereby reduce the spring hysteresis of the resilient joints.
Inventors
- 👤 Walter Sodler
- 👤 Dieter Blawert
- 👤 Jurgen Ober
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:16
CPC Classifications
G; G01; G01G; G01G7/00; G01G7/02; G01G7/04; G01G21/00; G01G21/24; G01G21/244; Y; Y10; Y10S; Y10S177/00; Y10S177/11
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
An electromagnetic force-compensating precision weigher, comprising: a load picking-up device supported by means of metallic resilient joints and vertically movable between stops; and electric means connected with the load picking-up device imposing a slowly dying-out mechanical oscillation upon the load picking-up device and reducing the spring hysteresis of the resilient joints.
Claim 2
Dependent Claim
51 words
An electromagnetic force-compensating precision weigher, comprising: a load picking-up device supported by means of metallic resilient joints and vertically movable between stops; and electric means connected with the load picking-up device imposing a slowly dying-out mechanical oscillation upon the load picking-up device and reducing the spring hysteresis of the resilient joints.
Claim 3
Dependent Claim
34 words
A precision weigher as in claim 1, wherein: the weigher includes an electromagnetic force compensation coil; and the oscillation is forced upon the load picking-up device by the coil of the electromagnetic force compensation.
Claim 4
Dependent Claim
49 words
A precision weigher as in one of claims 1 or 2, wherein: the electric means includes an automatic control circuit, connected with the electromagnetic force compensation coil in such a way that at a load change a new rated value is reached by means of a slowly dying-out oscillation.
Claim 5
Dependent Claim
41 words
A precision weigher as in one of claims 1 or 2, wherein: the electric means are structured in such a way that the initial amplitude and the dying-out time constant of the oscillation are independent of the magnitude of the load.
Claim 6
Dependent Claim
21 words
A precision weigher as in one of claims 1 or 2, wherein: the oscillation frequency ranges between 1 and 10 Hz.
Claim 7
Dependent Claim
36 words
A precision weigher as in one of claims 1 or 2, wherein: the dying-out time constant of the oscillation is chosen in such a way that the oscillation has died out after 0.5 to 5 seconds.
Claim 8
Dependent Claim
24 words
A precision weigher as in one of claims 1 or 2, wherein: a manually operated key is connected for switching on the electric means.
Claim 9
Dependent Claim
46 words
A precision weigher as in one of claims 1 or 2, wherein: the electric means includes an automatic control circuit connected with the electric means for switching the electric means on automatically when the deflection of the load picking-up device has exceeded a prespecified limiting value.
Claim 10
Dependent Claim
33 words
A precision weigher as in one of claims 1 or 2, wherein: the weigher has an enclosed weighing space; and the electric means are automatically switched on when the weighing space is closed.
Claim 11
Dependent Claim
35 words
A precision weigher as in one of claims 1 or 2, wherein: the weigher includes weight switching; and the electric means are automatically switched on after the conclusion of the setting of the weight switching.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |