US3674094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic slope controller
Assignee: Danfoss Power Solutions US Co
•
Filing: 1970-08-31
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Granted: 1972-07-04
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Expires: 1990-08-31
Abstract
Abstract A controller for a road finishing machine which is adapted to match the slope of the surface presently being prepared to the slope of an adjacent surface previously prepared embodying a first means for sensing the slope of the previously prepared surface, a second means for sensing the slope of the surface currently being prepared and control means for comparing the outputs of the two sensors and for providing an error signal indicative of the difference of the two slopes.
Inventors
- 👤 Leland E Kuntz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:07
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/004
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
A device for automatically controlling a road finishing machine, wherein the machine makes several consecutive parallel passes in its road finishing operations and wherein it is desired to match the slope of the current pass of the machine to the slope of the surface prepared by the previous pass, comprising: first sensing means for producing an output indicative of the slope angle of the surface prepared by the road finishing machine in making its previous pass, second sensing means for producing an output indicative of the slope angle of the current pass of the road finishing machine, and comparison means connected to said first and second sensing means for comparing the outputs of the first and second sensing means and producing an error signal, said error signal representing the difference in the slope angles of the current pass and of the surface prepared by the previous pass.
Claim 2
Independent Claim
147 words
A device for automatically controlling a road finishing machine, wherein the machine makes several consecutive parallel passes in its road finishing operations and wherein it is desired to match the slope of the current pass of the machine to the slope of the surface prepared by the previous pass, comprising: first sensing means for producing an output indicative of the slope angle of the surface prepared by the road finishing machine in making its previous pass, second sensing means for producing an output indicative of the slope angle of the current pass of the road finishing machine, and comparison means connected to said first and second sensing means for comparing the outputs of the first and second sensing means and producing an error signal, said error signal representing the difference in the slope angles of the current pass and of the surface prepared by the previous pass.
Claim 3
Dependent Claim
18 words
A device as set forth in claim 1 wherein said first sensing means comprises a pendulum gravity sensor.
Claim 4
Dependent Claim
18 words
A device as set forth in claim 1 wherein said second sensing means comprises a pendulum gravity sensor.
Claim 5
Dependent Claim
69 words
A device as set forth in claim 3 wherein said pendulum gravity sensor comprises: a weighted structure which seeks a gravity reference, a primary coil adapted to receive an alternating current signal, at least two secondary coils connected to said comparison means, and a core connected to and movable by said weighted structure whereby movement of said core produces a change in the output signals across said secondary coils.
Claim 6
Dependent Claim
69 words
A device as set forth in claim 4 wherein said comparison means comprises: a full wave rectifying bridge for each of said secondary coils, each secondary coil being connected across its respective bridge, said bridges being interconnected so as to be series additive so that the bridge has two end junctions and a midpoint, and means connecting said first sensing means across the two end points of the bridge.
Claim 7
Dependent Claim
39 words
A device as set forth in claim 5 further comprising, a manually adjustable reference means, and switching means for selectively connecting either the first sensing means or the manually adjustable reference means across the end junctions of the bridges.
Claim 8
Dependent Claim
39 words
A device as set forth in claim 1 wherein said device further comprises a manually adjustable reference means, and switching means for selectively connecting either the first sensing means or the manually adjustable reference means to the comparison means.
Claim 9
Dependent Claim
22 words
A device as set forth in claim 1 wherein each of said first and second sensing means comprises a pendulum gravity sensor.
Claim 10
Dependent Claim
27 words
A device as set forth in claim 1 wherein offset means are connected to the first sensing means for adjusting the output of said first sensing means.
Claim 11
Dependent Claim
60 words
A device as set forth in claim 1 wherein said first sensing means comprises a traveling ski adapted to be mechanically connected to said machine, said ski extending over a substantial transverse portion of said previously prepared surface, and a pendulum gravity sensor mounted upon said ski to sense the slope thereof, said sensor being connected to said comparison means.
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |