US3772797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical plumb bob and method
Assignee: Individual
•
Filing: 1972-05-30
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Granted: 1973-11-20
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Expires: 1992-05-30
Abstract
Abstract An optical plumb bob having a base, an optical ray tube gimbaled together on the base and having lenses, light and a cross hair scope therein to project a cross hair image on the ceiling, the bottom of the tube being equipped with a movable magnetically attached floor pointer and a removable magnetically attached weight so that after the cross hair image is focused on a ceiling point, the bob can be calibrated by shifting the pointer or weight or both so as to direct the pointer at a floor point vertically below the ceiling point whereby the bob is calibrated for locating other ceiling points (as for hangars) which are vertically above pre-selected floor points.
Inventors
- 👤 J Gleba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:33
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/10; G01C15/105
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
In a method for determining spot locations on ceilings vertically above spot location on floors for the installation of hangars and the like, the steps of locating a floor point and a ceiling point in vertical alignment, positioning a ray delivering optical plumb bob having an adjustable pointer at the lower end thereof so as to center the ray on the ceiling point, calibrating the plumb bob so as to direct a pointer at its other end toward the floor point and, with the plumb bob so calibrated, locating thereby at least one other point on said ceiling vertically above a predetermined point on said floor.
Claim 2
Dependent Claim
106 words
In a method for determining spot locations on ceilings vertically above spot location on floors for the installation of hangars and the like, the steps of locating a floor point and a ceiling point in vertical alignment, positioning a ray delivering optical plumb bob having an adjustable pointer at the lower end thereof so as to center the ray on the ceiling point, calibrating the plumb bob so as to direct a pointer at its other end toward the floor point and, with the plumb bob so calibrated, locating thereby at least one other point on said ceiling vertically above a predetermined point on said floor.
Claim 3
Dependent Claim
15 words
The method of claim 1 in which said calibration includes repositioning a magnetically coupled pointer.
Claim 4
Dependent Claim
23 words
The method of claim 1 in which said calibration includes applying a magnetic weight eccentrically to the axis of said optical plumb bob.
Claim 5
Dependent Claim
80 words
An optical plumb bob comprising a base equipped with pivot means, an optical tube pivotally mounted on said means for movement in a plurality of horizontal directions, said tube including a light source, a cross hair scope and lenses so as to deliver a light ray upwardly and project a cross-hair on a ceiling, the bottom of said tube being equipped with calibration means for directing a pointer associated therewith to a floor point vertically aligned with said ceiling point.
Claim 6
Dependent Claim
80 words
An optical plumb bob comprising a base equipped with pivot means, an optical tube pivotally mounted on said means for movement in a plurality of horizontal directions, said tube including a light source, a cross hair scope and lenses so as to deliver a light ray upwardly and project a cross-hair on a ceiling, the bottom of said tube being equipped with calibration means for directing a pointer associated therewith to a floor point vertically aligned with said ceiling point.
Claim 7
Dependent Claim
22 words
The structure of claim 4 in which said calibration means includes a weight adapted to be attached eccentrically of said tube axis.
Claim 8
Dependent Claim
15 words
The structure of claim 5 in which said weight is magnetically coupled to said tube.
Claim 9
Dependent Claim
21 words
The Structure of claim 4 in which said pointer is removably, magnetically coupled to said tube to constitute said calibration means.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |