Patent US3704954A successfully refreshed from Google Patents.
US3704954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leveling instrument
Assignee: Jenoptik AG
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Filing: 1970-12-07
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Granted: 1972-12-05
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Expires: 1990-12-07
Abstract
Abstract A leveling instrument comprises a sighting telescope and an optical micrometer. The anallactic point, or telescope point of tilt, decisive for the height measurement is exterior to the vertical axis of rotation of the telescope. By means of the micrometer, the collimating mark and the leveling staff are so displaced relatively to one another in the telescope field of vision that the mark and a full interval of the leveling staff coincide. The relative displacement is indicated by an index on a scale and read through an optical reading system. The reading system includes an optical compensator for balancing the effect which the distance between the anallactic point and the vertical axis of rotation of the telescope produces on the height measurement.
Inventors
- 👤 Gerhard Huther
- 👤 Rolf Roder
- 👤 Ulrich Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:35
CPC Classifications
G; G01; G01C; G01C5/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
A leveling instrument rotatable about a substantially vertical axis in which the anallactic point decisive for height measurement is exterior to said axis, comprising a telescope housing, an objective, an eyepiece, a collimating mark, said objective, said eyepiece and said mark being positioned in said housing, said objective and said eyepiece having a common optical axis and a common image plane which is substantially at right angles to said optical axis, said mark lying in both said optical axis and said image plane, said objective imaging a distant object in said image plane, an optical means for relative displacement in said image plane of said mark and the image of said object, optical elements for directing the imaging ray path from said objective to said eyepiece, a micrometer for measurement of the relative displacement of said mark and the image of said object, said micrometer being attached to said housing and comprising an index, a scale and a reading system, said index and said scale being displaceable relatively to one another and being connected with said optical means for the indication of the relative displacement of said mark and the image of said object, said reading system being for reading this indication, an optical compensator comprising a pendulum attaching a first deviating optical element, said first deviating optical element being included in the ray path of said reading system and compensating height measuring errors as a function of the distance between the anallactic point and said vertical axis of rotation.
Claim 2
Dependent Claim
250 words
A leveling instrument rotatable about a substantially vertical axis in which the anallactic point decisive for height measurement is exterior to said axis, comprising a telescope housing, an objective, an eyepiece, a collimating mark, said objective, said eyepiece and said mark being positioned in said housing, said objective and said eyepiece having a common optical axis and a common image plane which is substantially at right angles to said optical axis, said mark lying in both said optical axis and said image plane, said objective imaging a distant object in said image plane, an optical means for relative displacement in said image plane of said mark and the image of said object, optical elements for directing the imaging ray path from said objective to said eyepiece, a micrometer for measurement of the relative displacement of said mark and the image of said object, said micrometer being attached to said housing and comprising an index, a scale and a reading system, said index and said scale being displaceable relatively to one another and being connected with said optical means for the indication of the relative displacement of said mark and the image of said object, said reading system being for reading this indication, an optical compensator comprising a pendulum attaching a first deviating optical element, said first deviating optical element being included in the ray path of said reading system and compensating height measuring errors as a function of the distance between the anallactic point and said vertical axis of rotation.
Claim 3
Dependent Claim
57 words
A leveling instrument as claimed in claim 1, wherein a sighting line control is included in the imaging ray path between said objective and said eyepiece, said sighting line control comprises a pendulum attaching a second deviating optical element, and said first deviating optical element and said second deviating optical element are rigidly interconnected with one another.
Claim 4
Dependent Claim
39 words
A leveling instrument as claimed in claim 2, wherein said eyepiece forms part of said reading system, and wherein the imaging ray path between said objective and said eyepiece and said reading system include a common ray-combining optical element.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |