US4090781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror orienting device for a laser levelling instrument
Assignee: EssilorLuxottica SA
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Filing: 1976-12-30
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Granted: 1978-05-23
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Expires: 1996-12-30
Abstract
Abstract A mirror-orienting device for a laser levelling instrument utilizes an optical deflection system, a mirror which rotates about a fixed axis in the same plane as the mirror, a mirror lever fixed to the mirror at one end, a component for fine adjustment of rotation of the mirror, combined with a linear measurement indicator, which includes a measuring contact that moves axially. This allows the mirror to be oriented accurately, in relation to a reference direction, for example a horizontal or a vertical direction.
Inventors
- 👤 Jean Marie Godot
- 👤 Gerard Lafargue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:03
CPC Classifications
G; G01; G01C; G01C5/00; G01B; G01B11/00; G01B11/26; G01C15/00; G01C15/002
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
A mirror-orienting device for a laser levelling instrument, said device comprising an optical deflecting system, a mirror mounted for rotation about a first fixed axis in the plane thereof, a mirror lever fixed to the mirror at one end thereof, a device for fine adjustment of rotational position of the mirror, a linear measurement indicator including an axially movable measuring contact, a control lever mounted for rotation about a second fixed axis parallel to the first axis, said control lever having between its ends a mirror lever engaging surface and a first flat surface remote from said second axis and said mirror lever engaging surface, said flat surface engaging with the measuring contact and being disposed parallel to the axis of rotation of the control lever, the end of the mirror lever remote from the mirror having a second flat surface parallel to the plane defined by said first and second axes, with a spring for urging said second flat surface of said mirror lever and said mirror lever engaging surface into mutual contact, the fine-adjustment device being mechanically coupled to one of said levers, said second axis being equidistant from said first axis and the region of contact of said mirror lever engaging surface with said second flat surface.
Claim 2
Dependent Claim
210 words
A mirror-orienting device for a laser levelling instrument, said device comprising an optical deflecting system, a mirror mounted for rotation about a first fixed axis in the plane thereof, a mirror lever fixed to the mirror at one end thereof, a device for fine adjustment of rotational position of the mirror, a linear measurement indicator including an axially movable measuring contact, a control lever mounted for rotation about a second fixed axis parallel to the first axis, said control lever having between its ends a mirror lever engaging surface and a first flat surface remote from said second axis and said mirror lever engaging surface, said flat surface engaging with the measuring contact and being disposed parallel to the axis of rotation of the control lever, the end of the mirror lever remote from the mirror having a second flat surface parallel to the plane defined by said first and second axes, with a spring for urging said second flat surface of said mirror lever and said mirror lever engaging surface into mutual contact, the fine-adjustment device being mechanically coupled to one of said levers, said second axis being equidistant from said first axis and the region of contact of said mirror lever engaging surface with said second flat surface.
Claim 3
Dependent Claim
40 words
A device as defined in claim 1, in which the axially-moving measuring contact is perpendicular to the first flat surface with which said contact co-operates, when said region of contact is adjacent the plane of said first and second axes.
Claim 4
Dependent Claim
74 words
A device as defined in claim 2, wherein said levers and said measuring contact each have a reference position, and the distance between the point of contact of the measuring contact on the first flat surface with which said contact co-operates and the second axis, measured in a direction perpendicular to said second axis, has a predetermined value of 100 millimeters when said levers and said measuring contact are in their respective reference positions.
Claim 5
Dependent Claim
65 words
A device as defined in claim 1, in which the distance between the point of contact of the measuring contact on the first flat surface with which said contact co-operates, and the second axis, measured in a direction perpendicular to said second axis, has a predetermined value of 100 millimeters, when said region of contact is adjacent the plane of said first and second axes.
Claim 6
Dependent Claim
17 words
A device as defined in claim 1, wherein said mirror lever engaging surface comprises a cylindrical element.
Claim 7
Dependent Claim
22 words
A device as defined in claim 5, wherein said element is rotatable about an axis parallel to said first and second axes.
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) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |