US3796496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser plummet level
Assignee: Individual
•
Filing: 1971-08-03
•
Granted: 1974-03-12
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Expires: 1991-08-03
Abstract
Abstract There is provided herein a laser level surveying instrument including means for projecting a laser beam at a desired elevation and means for interrupting the flow of current to the plasma tube in response to undue physical disturbance of the instrument which might disturb the direction of the directed beam.
Inventors
- 👤 R Appler
- 👤 H Hoehn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:09
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/002
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
A laser-plummet-level instrument comprising in combination a movable support, a laser tube mounted thereon for emitting a laser beam, a power source operatively associated with said tube, a beam splitter intercepting said laser beam and transmitting a vertical component and a horizontal component, an inertia switch interposed between said laser tube and said power source adapted to interrupt the flow of current in response to undesirable jarring of said instrument and manual means for restoring the flow of current to said laser tube.
Claim 2
Dependent Claim
83 words
A laser-plummet-level instrument comprising in combination a movable support, a laser tube mounted thereon for emitting a laser beam, a power source operatively associated with said tube, a beam splitter intercepting said laser beam and transmitting a vertical component and a horizontal component, an inertia switch interposed between said laser tube and said power source adapted to interrupt the flow of current in response to undesirable jarring of said instrument and manual means for restoring the flow of current to said laser tube.
Claim 3
Dependent Claim
25 words
The instrument defined in claim 1 having means for raising and lowering the angle at which said horizontal component is transmitted without moving said instrument.
Claim 4
Dependent Claim
97 words
The invention of claim 1 wherein said inertia switch comprises a non-conductive body mounted on the support and having a cavity therein, a floating conductive member movably suspended within said cavity having a home position under quiet conditions, a pair of conductive members separately extending through the wall of said non-conductive body and being in contact on their interior ends with said floating member, and being connected in sequence between said power source and said laser tube whereby movement of said floating member horizontally interrupts the flow of current from said power source to said laser tube.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |