Patent US1799345A successfully refreshed from Google Patents.
US4472970A
Expired / Lapsed
US
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Method of measuring the dimensions of tools and/or workpieces of metal
Assignee: Individual
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Filing: 1982-08-31
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Granted: 1984-09-25
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Expires: 2002-08-31
Abstract
Abstract The invention relates to a method of measuring the dimensions of tools and/or workpieces of metal. The measuring is characterized in that an electro-erosive material-machining discharge in a dielectric is used as transmitter of pressure waves, the time of which through the tool or workpiece to the arrival in at least three well-defined positions is scanned and gives rise to time-responsive current pulses for a digital measuring system.
Inventors
- 👤 Erik Sundstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:45
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18; G; G01; G01B; G01B17/00; G01B17/02; G01N; G01N29/00; G01N29/04; G01N29/07; G01N29/22; G01N29/24; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02854
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
A method of measuring the dimensions of tools and/or workpieces of metal comprising: transmitting pressure waves by an electro-erosive material-machining discharge in a dielectric between the tool and the workpiece; and measuring pressure wave propagation time through the tool and/or workpiece and determining the position of the discharge.
Claim 2
Independent Claim
48 words
A method of measuring the dimensions of tools and/or workpieces of metal comprising: transmitting pressure waves by an electro-erosive material-machining discharge in a dielectric between the tool and the workpiece; and measuring pressure wave propagation time through the tool and/or workpiece and determining the position of the discharge.
Claim 3
Dependent Claim
30 words
A method as defined in claim 1 including: scanning a front of the pressure wave in at least three predetermined positions separated from each other on the tool and/or workpiece.
Claim 4
Dependent Claim
20 words
A method as defined in claim 1 or 2, including: locating the at least three predetermined positions in one plane.
Claim 5
Dependent Claim
32 words
A method as defined in claim 3, including: converting the pressure-wave front to time responsive current pulses for a digital measuring system by pressure-sensitive members in the at least three predetermined positions.
Claim 6
Dependent Claim
30 words
A method as defined in claim 4, including: forming the electro-erosive discharge from a spark formation device; and determining the position of the discharge for the measuring of tools and/workpieces.
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) | 1987-09-25 | 1988-03-26 | 1988-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-25 | 1992-03-26 | 1992-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-25 | 1996-03-26 | 1996-09-25 | $7700.00 | Window Closed / Lapsed |