Patent US4333331A successfully refreshed from Google Patents.
US4333331A
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Calibrating unit for calibrating a hydraulic or electric pressure gauge, especially of a probing device
Assignee: Goudsche Machinefabriek BV
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Filing: 1980-08-13
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Granted: 1982-06-08
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Expires: 2000-08-13
Abstract
Abstract A calibrating unit for calibrating a pressure gauge includes a piston (7) which may be loaded by pressurized oil and which may be fastened at its upper end to the pressure gauge. A pressure piece (11) being movable within the piston (7) can be loaded at its upper side by a measuring member (3) of the pressure gauge and can transmit this load at its lower side to a spring system (15,16,17) resting on the housing (6) of the unit. The movement of the pressure piece (11) is determined by a measuring instrument such as a measuring watch (21). The deflection of the pointer of this watch is a calibrating measure for the pressure gauge.
Inventors
- 👤 Adriaan B. Mann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:42
CPC Classifications
E; E02; E02D; E02D1/00; E02D1/02; E02D1/022; G; G01; G01L; G01L27/00; G01L27/002; G01L27/005; G01N; G01N3/00; G01N3/62; G01N2203/00; G01N2203/02; G01N2203/0202; G01N2203/021
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
Calibrating unit for calibrating a hydraulic or electric pressure gauge especially of a probing device, wherein the calibrating unit comprises at least a housing having a wall, and upper side, and a bottom plate, a piston mounted within said housing and having a connecting portion protruding from the upper side of the housing for connecting the piston with a casing of the pressure gauge to be calibrated, a supply channel in the wall of the housing for supplying hydraulic liquid to load the piston, a pressure piece movable within the piston and having an upper side, a lower side and a lower face, said pressure piece being able to be loaded at its upper side by a measuring member of the pressure gauge to be calibrated and to load at its lower side a spring element resting on the housing, and a measuring watch or the like for determining the movement of the pressure piece.
Claim 2
Dependent Claim
155 words
Calibrating unit for calibrating a hydraulic or electric pressure gauge especially of a probing device, wherein the calibrating unit comprises at least a housing having a wall, and upper side, and a bottom plate, a piston mounted within said housing and having a connecting portion protruding from the upper side of the housing for connecting the piston with a casing of the pressure gauge to be calibrated, a supply channel in the wall of the housing for supplying hydraulic liquid to load the piston, a pressure piece movable within the piston and having an upper side, a lower side and a lower face, said pressure piece being able to be loaded at its upper side by a measuring member of the pressure gauge to be calibrated and to load at its lower side a spring element resting on the housing, and a measuring watch or the like for determining the movement of the pressure piece.
Claim 3
Dependent Claim
36 words
Calibrating unit according to claim 1, wherein a ball is mounted between a conical recess in the lower face of the pressure piece and the spring element, a pin of the measuring watch engaging said ball.
Claim 4
Dependent Claim
33 words
Calibrating unit according to claim 1 or 2, wherein the spring element comprises at least one Belleville spring resting on the bottom plate (18) of the housing so as to be easily exchangeable.
Claim 5
Dependent Claim
27 words
Calibrating unit according to claim 1 or 2, wherein on the upper side of the pressure piece an exchangeable intermediate piece having an upper face, is mounted.
Claim 6
Dependent Claim
16 words
Calibrating unit according to claim 4, wherein the upper face of the intermediate piece is convex.
Claim 7
Dependent Claim
20 words
Calibrating unit according to claim 4, wherein a conical recess is made in the upper face of the intermediate piece.
References Cited (Backward Citations)
GB556195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |