Patent US4441818A successfully refreshed from Google Patents.
US4441818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection unit
Assignee: NICATOR A SWEDISH Co AB
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Filing: 1981-04-07
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Granted: 1984-04-10
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Expires: 2001-04-07
Abstract
Abstract A deflection unit on a path parallel to a light beam has a rider, which grips the track of a measuring guide (not shown) and permits a beam component to pass while deflecting a component. A levelling means is provided on a line bisecting the angle between the incoming and the deflected beams in or parallel to their common plane to facilitate remote positional measurements of reference points on a body in order to make measurements more accurate.
Inventors
- 👤 Kjell J. Wickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/002; G01B11/02; G01B11/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A controllable light beam deflection apparatus for deflecting a light beam such that it travels in a predetermined measuring plane, comprising: a beam deflection unit displaceable along a guide which extends substantially parallel to the light beam to be deflected, and a level sensor comprising means for sensing the level deviation within a plane parallel to the measuring plane and along a line that bisects the angle between the beam to be deflected and the deflected beam for rotationally setting the deflection unit about an axis which is within a plane perpendicular to said measuring plane and perpendicular to said line.
Claim 2
Dependent Claim
101 words
A controllable light beam deflection apparatus for deflecting a light beam such that it travels in a predetermined measuring plane, comprising: a beam deflection unit displaceable along a guide which extends substantially parallel to the light beam to be deflected, and a level sensor comprising means for sensing the level deviation within a plane parallel to the measuring plane and along a line that bisects the angle between the beam to be deflected and the deflected beam for rotationally setting the deflection unit about an axis which is within a plane perpendicular to said measuring plane and perpendicular to said line.
Claim 3
Dependent Claim
16 words
A deflection apparatus according to claim 1, characterized in that the sensor is a spirit level.
Claim 4
Dependent Claim
32 words
A deflection apparatus according to claim 1, characterized in that the sensor has an electrical output related to the deflection of the sensor from a level position parallel to the measuring plane.
Claim 5
Dependent Claim
35 words
A deflection apparatus according to claim 3, including a setting device controlled by the output of the sensor to set the beam deflection unit so that the output of the sensor has a predetermined value.
Claim 6
Dependent Claim
42 words
A deflection apparatus according to claim 3, characterized in that the sensor is a pendulum accelerometer which cooperates with a setting device which is adapted to set the beam deflection unit so that the output of the accelerometer has a predetermined value.
Claim 7
Dependent Claim
37 words
A deflection apparatus according to claim 1, characterized in that the beam deflection unit has two reflective surfaces set at right angles to a measuring plane containing both the beam to be deflected and the deflected beam.
Claim 8
Dependent Claim
103 words
A controllable light beam deflection apparatus for deflecting a light beam such that it travels in a predetermined measuring plane comprising: a beam deflection unit displaceable along a guide which extends substantially parallel to the light beam to be deflected, and a level sensor comprising means for sensing the level deviation within a plane parallel to the measuring plane and along a line that bisects the angle between the beam to be deflected and the deflecting beam for rotationally setting the unit about an axis which is within a plane perpendicular to said measuring plane and parallel to said beam to be deflected.
Claim 9
Dependent Claim
103 words
A controllable light beam deflection apparatus for deflecting a light beam such that it travels in a predetermined measuring plane comprising: a beam deflection unit displaceable along a guide which extends substantially parallel to the light beam to be deflected, and a level sensor comprising means for sensing the level deviation within a plane parallel to the measuring plane and along a line that bisects the angle between the beam to be deflected and the deflecting beam for rotationally setting the unit about an axis which is within a plane perpendicular to said measuring plane and parallel to said beam to be deflected.
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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) | 1987-04-10 | 1987-10-10 | 1988-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-10 | 1991-10-10 | 1992-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-10 | 1995-10-10 | 1996-04-10 | $7700.00 | Window Closed / Lapsed |