US3559544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quick crown change for screeds and the like
Assignee: Curbmaster of America Inc
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Filing: 1969-03-03
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Granted: 1971-02-02
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Expires: 1989-03-03
Abstract
Abstract Crown control for screeds and the like in which a continuous screed bar is suspended from a beam in the form of two aligned beam sections spaced apart at their adjacent ends. The beam sections are pivoted to the screed bar at their outer ends by brackets depending from the outer ends of the beam sections, and pivotally connected to the outer ends of the screed bar for movement about axes extending transversely of the bar. Spaced links are pivotally connected between each beam section and the screed bar and extend angularly downwardly and outwardly from the respective beam sections. A guiding connection is provided between the beam sections, and guides the beam sections for angular movement about their axes of connection to opposite ends of the screed bar. A power jack is spaced above the beam and extends across the adjacent ends of the beam sections, and is connected thereto at its opposite ends. As the jack is extended, the beam sections will pivot upwardly about their axes of connection to the screed bar. This will draw the screed bar upwardly from its opposite ends through the connecting links and will draw the screed bar into a parabolic crown. Retractable movement of the power jack will align the beam sections and move the screed bar into a flat position.
Inventors
- 👤 Harold E Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:10
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/22; E01C19/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
252 words
In a screed and in combination with a spreader-finisher for paving materials including: a mobile frame; a beam extending across said frame; means suspending said beam from said frame adjacent opposite ends thereof; said beam being in the form of two separate aligned beam sections; means guiding said beam sections along their inner ends for relative angular movement with respect to each other in vertical directions; a continuous screed bar disposed beneath said beam sections and extending generally parallel thereto for the length thereof; finishing means extending along said screed bar; means suspending said screed bar from said beam sections, adjacent the outer ends of said beam sections and forming a reaction means for the outer end portions of said beam sections; connecting means connected between said beam sections and screed bar at spaced intervals therealong; extensible means connected between said beam sections adjacent the inner ends thereof, for moving said beam sections upwardly about the reaction means of said beam sections to said screed bar, and effecting the crowning of said screed bar by the compressive action of said beam sections on said screed bar and the drawing action of said connecting means on said screed bar; and said means guiding said beam sections for relative angular movement with respect to each other in vertical directions comprising a guide member connected to one end of one beam section and extending along the next adjacent beam section, and a lost motion connection between said guide member and the next adjacent beam section.
Claim 2
Dependent Claim
252 words
In a screed and in combination with a spreader-finisher for paving materials including: a mobile frame; a beam extending across said frame; means suspending said beam from said frame adjacent opposite ends thereof; said beam being in the form of two separate aligned beam sections; means guiding said beam sections along their inner ends for relative angular movement with respect to each other in vertical directions; a continuous screed bar disposed beneath said beam sections and extending generally parallel thereto for the length thereof; finishing means extending along said screed bar; means suspending said screed bar from said beam sections, adjacent the outer ends of said beam sections and forming a reaction means for the outer end portions of said beam sections; connecting means connected between said beam sections and screed bar at spaced intervals therealong; extensible means connected between said beam sections adjacent the inner ends thereof, for moving said beam sections upwardly about the reaction means of said beam sections to said screed bar, and effecting the crowning of said screed bar by the compressive action of said beam sections on said screed bar and the drawing action of said connecting means on said screed bar; and said means guiding said beam sections for relative angular movement with respect to each other in vertical directions comprising a guide member connected to one end of one beam section and extending along the next adjacent beam section, and a lost motion connection between said guide member and the next adjacent beam section.
Claim 3
Dependent Claim
121 words
A screed in accordance with claim 1: wherein the connecting means connected between said beam sections and said screed bar at the spaced intervals therealong, comprise links pivotally connected between said beam sections and screed bar, in which the links connected between a first of said beam sections and said screed bar diverge angularly toward the outer end of said screed bar as they extend downwardly from said beam section and are positioned substantially parallel with each other when the screed bar is level; and wherein the links connected to a second of the beam sections diverge angularly toward the outer end of the screed bar in opposite angular relation with respect to the links connected to the first beam section.
Claim 4
Dependent Claim
16 words
The screed in accordance with claim 2, wherein the links are in the form of turnbuckles.
Claim 5
Dependent Claim
32 words
A screed in accordance with claim 2, wherein the extensible means comprises a power operated jack extending across the adjacent ends of said beam sections and pivotally connected between said beam sections.
Claim 6
Dependent Claim
103 words
A screed in accordance with claim 2: wherein the extensible means is in the form of a power operated jack; wherein a motor is provided to operate said jack; wherein support brackets extend upwardly of said beam sections adjacent the adjacent ends thereof; and wherein said power operated jack is trunnioned to said suPport brackets to spread the beam sections upon extensible movement of said jack against the reaction afforded by the pivotal connections of said beam sections to said screed, to pull the screed bar into an arc or crown having a high point at the adjacent ends of said beam sections.
Claim 7
Dependent Claim
60 words
A screed in accordance with claim 1: wherein the reaction means comprise pivot pins pivotally connecting the outer ends of said beam sections to said screed bar; and wherein the connecting means comprise generally parallel links depending from each beam section and inclined outwardly relative to said beam sections as they extend downwardly and are connected with said screed bar.
Claim 8
Dependent Claim
98 words
A screed in accordance with claim 1: wherein the means suspending said screed bar from said beam sections comprise bracket members depending from the outer ends of said beam sections; wherein the reaction means comprise pivot pins pivotally connecting said bracket members to said screed bar, adjacent the outer ends thereof, for movement about axes extending transversely of said screed bar; and wherein the connecting means comprise turnbuckles pivotally connected between said beam sections and said screed bar and inclined outwardly relative to said beam sections as they extend downwardly and are pivotally connected to said screed bar.
Claim 9
Dependent Claim
127 words
A screed in accordance with claim 7: wherein the power means comprises a fluid pressure operated jack; wherein support brackets extend upwardly of said beam sections adjacent the adjacent ends thereof; and wherein said fluid pressure operated jack includes one member trunnioned to said support brackets extending upwardly of one beam section and an extensible member trunnioned to said support brackets extending upwardly of said other beam section; to elevate the adjacent ends of said beam sections against the reaction afforded by the pivot pins connecting said bracket members to said screed bar, to exert a buckling compressive force on said screed bar cooperating with said turnbuckles, to pull said screed bar into a crown having a high point at the adjacent ends of said beam sections.
Claim 10
Dependent Claim
23 words
A screed in accordance with claim 8, wherein the finishing means comprises a trowel pan mounted on the bottom of said screed bar.
Claim 11
Dependent Claim
32 words
A screed in accordance with claim 8, wherein the finishing means comprises a plurality of abutting screed pans extending along the bottom of said screed bar and upwardly along opposite sides thereof.
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |