US3656337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale calibration checking device
Assignee: Individual
•
Filing: 1971-01-19
•
Granted: 1972-04-18
•
Expires: 1991-01-19
Abstract
Abstract A pivoted scale beam type of weighing device senses the weight of articles traveling on a continuously moving conveyor belt. The conveyor belt is periodically displaced upwardly from the weighing device during test intervals to check calibration by simultaneously removing the load of the conveyor from the weighing device while transferring a reference weight thereto. The weighing device is automatically adjusted during each test interval if there is a deviation from a proper reference reading.
Inventors
- 👤 Ralph R Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:07
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/01; G01G23/012; G01G11/00; G01G11/006; G01G11/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
In combination with a continuously moving conveyor on which articles travel past a weighing station at which a weighing device senses the weight of said articles, a system for calibrating the weighing device comprising means for displacing the conveyor from operative relation to the weighing device during a test interval, means responsive to said displacement of the conveyor for loading the weighing device with a reference weight, means connected to the weighing device for detecting variations in the weight registered by the weighing device during the test intervals and adjustment means connected to said weighing device for canceling said variations.
Claim 2
Dependent Claim
100 words
In combination with a continuously moving conveyor on which articles travel past a weighing station at which a weighing device senses the weight of said articles, a system for calibrating the weighing device comprising means for displacing the conveyor from operative relation to the weighing device during a test interval, means responsive to said displacement of the conveyor for loading the weighing device with a reference weight, means connected to the weighing device for detecting variations in the weight registered by the weighing device during the test intervals and adjustment means connected to said weighing device for canceling said variations.
Claim 3
Dependent Claim
61 words
The combination of claim 1 wherein said weighing device comprises a pivoted scale beam, load applying means mounted by the scale beam for engagement with the conveyor, load sensing means in engagement with the scale beam for producing a signal in response to displacement of the scale beam, a recorder, and signal processing means connecting the sensing means to the recorder.
Claim 4
Dependent Claim
62 words
The combination of claim 2 wherein said conveyor displacing means includes load elevating means engageable with the conveyor upstream of the weighing device in the direction of travel of the articles, and power operated means connected to the load elevating means for displacement thereof into engagement with the conveyor and timer means for periodically activating the power operated during said test intervals.
Claim 5
Dependent Claim
28 words
The combination of claim 3 wherein said conveyor comprises an endless belt, and rollers supporting the belt both upstream and downstream of the load applying and elevating means.
Claim 6
Dependent Claim
64 words
The combination of claim 4 wherein said displacement responsive means comprises a test beam having opposite end portions, a fulcrum pivotally supporting the test beam between said opposite end portions, said load elevating means being mounted on one of said end portions and said reference weight being carried by the other of the end portions overlying the load sensing means of the weighing device.
Claim 7
Dependent Claim
42 words
The combination of claim 5 wherein the adjustment means includes adjustable impedance means connected to the signal processing means, a reversible motor drivingly connected to the impedance means, and reversing switch means connecting the detecting means to the motor for operation thereof.
Claim 8
Dependent Claim
62 words
The combination of claim 1 wherein said conveyor displacing means includes load elevating means engageable with the conveyor upstream of the weighing device in the direction of travel of the articles; and power operated means connected to the load elevating means for displacement thereof into engagement with the conveyor and timer means for periodically activating the power operated during said test intervals.
Claim 9
Dependent Claim
42 words
The combination of claim 7 wherein the adjustment means includes adjustable impedance means connected to the signal processing means, a reversible motor drivingly connected to the impedance means, and reversing switch means connecting the detecting means to the motor for operation thereof.
Claim 10
Dependent Claim
64 words
The combination of claim 2 wherein said displacement responsive means comprises a test beam having opposite end portions, a fulcrum pivotally supporting the test beam between said opposite end portions, said load elevating means being mounted on one of said end portions and said reference weight being carried by the other of the end portions overlying the load sensing means of the weighing device.
Claim 11
Dependent Claim
42 words
The combination of claim 1 wherein the adjustment means includes adjustable impedance means connected to the signal processing means, a reversible motor drivingly connected to the impedance means, and reversing switch means connecting the detecting means to the motor for operation thereon.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |