초록 ▼

An extension screed is for a paving vehicle screed assembly that includes a main screed. The extension screed includes two base members movably connectable with the main screed and two vertical actuators each extending between the main screed and a separate base member. Each vertical actuator linear

An extension screed is for a paving vehicle screed assembly that includes a main screed. The extension screed includes two base members movably connectable with the main screed and two vertical actuators each extending between the main screed and a separate base member. Each vertical actuator linearly displaces the connected base member with respect to the main screed in opposing vertical directions. A carriage preferably includes an inner frame movably connected with the base members and an outer frame slidably disposed about the inner frame and configured to support a screed plate. The vertical actuators vertically displace the carriage and alternatively pivot the carriage within a vertical plane. Further, a first horizontal actuator displaces the inner frame with respect to the two base members in opposing horizontal directions and a second horizontal actuator displaces the outer fame with respect to the inner frame in opposing horizontal directions.

대표청구항 ▼

We claim: 1. An extension screed for a screed assembly of a paving vehicle, the screed assembly including a main screed, the extension screed comprising: a base movably connectable with the main screed, the base having opposing lateral ends; a first vertical actuator connectable with the main scree

We claim: 1. An extension screed for a screed assembly of a paving vehicle, the screed assembly including a main screed, the extension screed comprising: a base movably connectable with the main screed, the base having opposing lateral ends; a first vertical actuator connectable with the main screed, the first vertical actuator being connected with the base and configured to linearly displace one lateral end of the base with respect to the main screed in opposing, generally vertical directions along a first vertical actuator axis, the first vertical actuator axis being fixed relative to the main screed; a second vertical actuator connectable with the main screed so as to be horizontally spaced from the first actuator, the second vertical actuator being connected with the base and configured to displace the other lateral end of the base with respect to the main screed in opposing, generally vertical directions along a second vertical actuator axis, the second vertical actuator axis being fixed relative to the main screed; a carriage movably connected with the base and configured to support an extension screed plate, the first vertical actuator and the second vertical actuator cooperating through the base to displace the carriage with respect to the main screed in opposing, generally vertical directions and to alternatively pivot the carriage with respect to the main screed within a generally vertical plane; and a horizontal actuator connected with the base and configured to linearly displace the carriage with respect to the base in opposing, generally horizontal directions along a horizontal actuator axis, the horizontal actuator axis being fixed relative to the carriage. 2. The extension screed as recited in claim 1 wherein the main screed includes a screed plate and the extension screed further comprises a screed plate mounted to the carriage such that when the base and the first vertical actuator and the second vertical actuator are connected with the main screed, the first vertical actuator and the second vertical actuator are configured to displace the base so as to adjust an elevational position of the extension screed plate with respect to the main screed plate and the horizontal actuator is configured to displace the carriage so as to adjust a horizontal position of the extension screed plate with respect to the main screed plate. 3. The extension screed as recited in claim 2 wherein each one of the main and extension screed plates has a lower horizontal working surface and the first vertical actuator and the second vertical actuator are configured to pivot the base with respect to main screed so as to adjust a slope angle between the extension screed plate surface and the main screed plate surface. 4. The extension screed as recited in claim 1 wherein: the carriage includes a first section movably connected with the base and a second section movably connected with the first section, the horizontal actuator being a first horizontal actuator and configured to linearly displace the first carriage section with respect to the base; and the extension screed further comprises a second horizontal actuator configured to displace the second carriage section with respect to the first carriage section in opposing, generally horizontal directions. 5. The extension screed as recited in claim 4 wherein: the main screed has a longitudinal centerline extending generally in a direction of paving vehicle travel and the second carriage section provides a carriage outer end spaced laterally from the centerline; the second horizontal actuator is configured to displace the second carriage section such that the carriage outer end moves between a first horizontal position at which the carriage outer end is spaced a first perpendicular distance from the centerline and a second horizontal position at which the carriage lateral end is spaced a second perpendicular distance from the centerline, the second distance being greater than the first distance; and the first horizontal actuator is configured to displace the first carriage section such that the carriage outer end moves between the second horizontal position and a third horizontal position at which the carriage outer end is spaced a third perpendicular distance from the centerline, the third distance being greater than the second distance. 6. The extension screed as recited in claim 5 wherein the main screed has a lateral outer end spaced a fourth perpendicular distance from the centerline and at least the second and third distances are each greater than the fourth distance such that the extension screed extends laterally outwardly from the main screed when the carriage outer end is disposed in one of the second horizontal position and the third horizontal position. 7. The extension screed assembly as recited in claim 4 wherein the second carriage section is disposed at least partially about the first carriage section such that the second horizontal actuator is configured to telescoping displace the second carnage section with respect to the first carriage section. 8. The extension screed assembly as recited in claim 4 wherein the main screed has a longitudinal centerline extending in a direction of paving vehicle travel, the extension screed has a central axis extending through the base and the carriage and generally perpendicularly with respect to the centerline, the first horizontal actuator is configured to displace the carriage generally along the central axis and the second horizontal actuator is configured to displace the second carriage section generally along the central axis. 9. The extension screed as recited in claim 4 further comprising: a first elongated guide member attached to the first carriage section and slidably connected with the base so as to movably connect the first carriage section with the base, the first guide member linearly displacing with respect to the base when the first horizontal actuator moves the first carriage section; and a second elongated guide member attached to the second carriage section and movably connected with the first guide member so as to movably connect the second carriage section with the first carriage section, the second guide member linearly displacing with respect to the first guide member when the second horizontal actuator moves the second carriage section. 10. The extension screed as recited in claim 9 wherein the base includes a bearing opening and the first guide member is slidably disposed within the base bearing opening. 11. The extension screed as recited in claim 9 wherein one of the first and second guide members includes an elongated tubular body and the other one of the first and second guide members includes an elongated post slidably disposed at least partially within the tubular body such that the post telescoping displaces with respect to the tubular body when the second carriage section displaces with respect to the first carriage section. 12. The extension screed as recited in claim 4 wherein the first carriage section includes a rail member and the second carriage section includes a slide member slidably disposed upon the rail member such that the first carriage section at least partially supports the weight of the second carriage section and the slide member displaces upon the rail when the second carriage section displaces with respect to the base. 13. The extension screed as recited in claim 4 wherein the first and second horizontal actuators each have a central axis, the first carriage section is displaceable along the first actuator axis and the second carriage section is displaceable along the second actuator axis, the two actuators being spaced apart vertically such that the two axes are generally disposed in a common vertical plane. 14. The extension screed as recited in claim 4 wherein the main screed includes a longitudinal centerline extending generally in a direction of paver travel, first carriage section has an inner lateral end and the first horizontal actuator is a hydraulic cylinder having a first displaceable cylinder rod, the first displaceable cylinder rod being attached to the carriage inner lateral end such that retraction of the first displaceable cylinder rod displaces the carriage generally away from the centerline and extension of the first displaceable cylinder rod displaces the carriage generally toward the centerline. 15. The extension screed as recited in claim 4 wherein: the first carriage section includes a first frame, the first frame at least partially bounding an interior space, the base being disposed within the first frame interior space; and the second carriage section includes a second frame, the second frame at least partially bounding an interior space, the first frame being disposable at least partially within the second frame interior space such that the second carriage section is displaceable about the first carriage section. 16. The extension screed as recited in claim 4 wherein the base includes a first body and a second body spaced horizontally from the first body, the first and second horizontal actuators each extending between and being connected with each one of the two base bodies. 17. The extension screed as recited in claim 1 wherein each one of the first and second vertical actuators has a movable portion attached to the base and vertically displaceable with respect to the main screed such that when the two actuator movable portions are each displaced a substantially equal vertical distance with respect to the main screed, the base is linearly displaced vertically with respect to the main screed. 18. The extension screed as recited in claim 17 wherein when the movable portion of one of the two vertical actuators is displaced a first vertical distance with respect to the main screed and the movable portion of the other one of the two vertical actuators is displaced a second, greater vertical distance with respect to the main screed, the base is pivotally displaced with respect to the main screed within a generally vertical plane. 19. The extension screed as recited in claim 18 wherein the main screed includes a screed plate with a generally horizontal working surface and the extension screed further comprises a screed plate mounted to the carriage and having a generally horizontal working surface, such that pivotal displacement of the base with respect to the main screed adjusts a slope angle between the main screed working surface and the extension screed working surface. 20. The extension screed as recited in claim 1 wherein the base includes a first portion and a second portion, the two base portions being spaced apart horizontally with respect to the main screed, the first vertical actuator being connected with the base first portion and the main screed, and the second vertical actuator being connected with the base second portion and the main screed. 21. The extension screed as recited in claim 20 wherein: when the two base portions are each displaced a substantially equal distance with respect to the main screed, the carriage is linearly displaced vertically with respect to the main screed; and when one of the two base portions is displaced a first vertical distance with respect to the main screed and the other one of the two base portions is displaced a second, greater vertical distance with respect to the main screed, the carriage is pivotally displaced with respect the main screed within a generally vertically plane. 22. The extension screed as recited in claim 20 wherein the main screed has a generally horizontal surface and when one of the two base portions is displaced to a first vertical position spaced a first vertical distance from the main screed surface while the other one of the two base portions is located at a second vertical position spaced a second vertical distance from the main screed surface, the first distance being greater than the second position, the carriage is pivotally displaced with respect to the main screed within a generally vertical plane. 23. The extension screed as recited in claim 20 wherein the main screed includes two horizontally spaced apart mounting bearings and each one of the first and second base portions includes a post, each one of the two base portion posts being slidably disposed within a separate one of the two mounting bearings to displaceably connect the base with the main screed. 24. The extension screed as recite in claim 20 wherein each one of the first and second base portions has a bearing opening and the extension screed further comprises an elongated guide member extending through each one of the two base bearing openings and having opposing ends attached to the carriage so as to connect the carriage with the base, the guide member being configured to slidably displace through the two base bearing openings when the horizontal actuator displaces the carriage with respect to the base. 25. The extension screed as recited in claim 1 wherein the main screed includes a longitudinal centerline extending generally in a direction of paving vehicle travel and the carriage has an outer lateral end, the horizontal actuator being configured to displace the carriage such that the carriage outer end is movable between a first, most proximal position with respect to the main screed centerline and a second most distal position with respect to the main screed. 26. The extension screed as recited in claim 1 wherein the main screed includes a mounting bearing and the base includes a post slidably disposed within the mounting bearing to displaceably connect the base with the main screed. 27. The extension screed as recited in claim 1 wherein the base includes two base portions spaced apart horizontally, each base portion being independently displaceably connected with the main screed and connected with the carriage. 28. The extension screed as recited in claim 1 wherein the carriage includes a first, inner carriage section disposed about the base and a second, outer carriage section slidably disposed at least partially about the inner carriage section and displaceable with respect to the first carriage section. 29. An extension screed for a main screed of a paving vehicle, the extension screed comprising: two base members, each base member being independently movably connectable with the main screed; two vertical actuators each connectable with the main screed and connected with a separate one of the two base members, each vertical actuator being configured to linearly displace the connected base member with respect to the main screed in opposing, generally vertical directions along an associated vertical actuator axis, each vertical actuator axis being fixed relative to the main screed; and a carriage configured to support an extension screed plate and connected with each one of the two base members for vertical movement with each of the two base members and for horizontal movement relative to each of the two base members, the two vertical actuators cooperating to displace the carriage and the extension screed plate with respect to the main screed in opposing, generally vertical directions and to alternatively pivot the carriage and the extension screed plate with respect to the main screed within a generally vertical plane. 30. An extension screed for a main screed of a paving vehicle, the extension screed comprising: a first base member and a second base member each movably connectable with the main screed; a first vertical actuator connectable with the main screed, the first vertical actuator being connected with the first base member and configured to linearly displace the first base member with respect to the main screed in opposing, generally vertical directions; a second vertical actuator connectable with the main screed in a position horizontally spaced from the first actuator, the second actuator being connected with the second base member and configured to displace the second base member with respect to the main screed in opposing, generally vertical directions; a carriage connected with the first base member and the second base member for vertical movement with the first base member and the second base member and for horizontal movement relative to the first base member and the second base member, the carriage being configured to support an extension screed plate; and a horizontal actuator connected with at least one of the first base member and the second base member and configured to linearly displace the carriage with respect to the first base member and the second base member in opposing, generally horizontal directions; wherein the first vertical actuator and the second vertical actuator cooperate through the first base member and the second base member to displace the carriage with respect to the main screed in opposing, generally vertical directions and to alternatively pivot the carriage with respect to the main screed within a generally vertical plane; and wherein, with the carriage pivoted relative to the main screed to a carriage pivoted position about a pivot point and with the first base member and the second base member held in position relative to the main screed, the horizontal actuator is operable to linearly displace the carriage with respect to the first base member and the second base member while the pivot point is maintained in a fixed position relative to the main screed.