Stepped deflector for a screed assembly

Patent metadata

Field	Value
Publication number	US-12448740-B2
Application number	US-202117499459-A
Country	US
Kind code	B2
Filing date	Oct 12, 2021
Priority date	Oct 12, 2021
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A deflector for a screed assembly includes a front surface, a bottom surface, and a stepped transition connecting the front surface to the bottom surface.

First claim

What is claimed is:

1. A deflector for use with a screed assembly, the deflector comprising:
a front surface;
a bottom surface; and
a stepped transition connecting the front surface to the bottom surface, wherein the stepped transition includes a ledge surface that is interposed between the front surface and the bottom surface, wherein the ledge surface forms an acute angle with the bottom surface that ranges from 0 to 30.0 degrees, and wherein the stepped transition includes a lower front facing surface that connects the ledge surface to the bottom surface.

2. The deflector of claim 1 , wherein the lower front facing surface forms an obtuse angle with the ledge surface that ranges from 90.0 to 120.0 degrees.

3. The deflector of claim 2 , wherein the acute angle ranges from 0 to 5.0 degrees.

4. The deflector of claim 3 , wherein the obtuse angle ranges from 95.0 degrees to 105.0 degrees.

5. The deflector of claim 4 , wherein the front surface forms another obtuse angle with the bottom surface that ranges from 90.0 degrees to 120.0 degrees.

6. The deflector of claim 5 , wherein the ledge surface and the lower front facing surface define at least a first step of the stepped transition.

7. The deflector of claim 2 , wherein the at least first step of the stepped transition defines a step height, and a step depth that is less than the step height.

8. A stepped deflector for use with a screed assembly, the stepped deflector comprising:
a stepped plate including
a bottom compacting surface;
a front surface;
an attack surface extending rearwardly from the front surface wherein the attack surface is a first planar surface; and
an accumulation surface extending downwardly from the attack surface toward the bottom compacting surface, wherein the accumulation surface is a second planar surface, and wherein together the attack surface and the accumulation surface form a stepped transition connecting the front surface to the bottom compacting surface, wherein the attack surface defines an attack depth and the accumulation surface defines a height measured from the bottom compacting surface to the attack surface that is less than attack depth.

9. The stepped deflector of claim 8 , wherein the attack surface forms a first included angle with the front surface that ranges from 92.5 degrees to 120.0 degrees.

10. A screed assembly for use with a paving machine with a direction of travel, the screed assembly comprising:
a stepped deflector plate with a bottom edge; and
a tamper bar disposed near the bottom edge of the stepped deflector plate that is configured to move up and down vertically to pre-compact paving material, the tamper bar defining a chamfer angle relative to the direction of travel;
wherein the stepped deflector plate includes a frontmost surface, a bottommost surface, and at least a pair of planar surfaces that are offset from each other along a direction that is perpendicular to the direction of travel, and that are both parallel with the chamfer angle of the tamper bar.

11. The screed assembly of claim 10 , further comprising a pair of side plates, and a bottom horizontally extending main screed plate.

12. The screed assembly of claim 10 , further comprising a straight back plate that is attached to the stepped deflector plate, or a bent reinforcement plate that is attached to the stepped deflector plate.

13. The screed assembly of claim 10 , wherein the stepped deflector plate comprises a single step that consists essentially of the pair of planar surfaces.

14. The screed assembly of claim 10 , further comprising a wear bar that is disposed laterally adjacent to the tamper bar.

15. The screed assembly of claim 10 , further comprising a frontmost surface extending along a direction that is perpendicular to the direction of travel, and an intermediate surface that is interposed between the pair of planar surfaces, the intermediate surface being parallel with the frontmost surface.

16. The screed assembly of claim 10 , wherein the screed assembly is a main screed assembly.

17. The screed assembly of claim 10 , wherein the stepped deflector plate is manufactured via a bending process.

Assignees

• Caterpillar Paving Products Inc

Inventors

• Engel Brett Wayne
• Steinhagen Anthony Paul
• Jorgensen John E
• Thiesse Ryan T

Classifications

• E01C19/40 Primary

  adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers · CPC title

• E01C19/4853 Primary

  Apparatus designed for railless operation, e.g. crawler-mounted, provided with portable trackway arrangements · CPC title