Road finisher, screed plate, and tamper bar comprising a heating element and method to manufacture the same

Patent metadata

Field	Value
Publication number	US-9249544-B2
Application number	US-201414448704-A
Country	US
Kind code	B2
Filing date	Jul 31, 2014
Priority date	Jul 31, 2013
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

The present invention relates to a road finisher comprising a screed plate and/or a tamper bar and also to a screed plate and/or tamper bar comprising a heating layer applied by thermal spraying.

First claim

What is claimed is:

1. A road finisher, comprising:
a screed plate extending at right angles to the working direction (a) of said road finisher; and
a tamper bar disposed rearwardly and/or forwardly of said screed plate in the working direction (a), wherein an electrical heating device comprising a power source, at least one electrically operated heating element electrically connected to said power source and a switchgear unit for switching said at least one heating element on and off is present, which is configured so as to heat up a heating surface facing a road subsurface (U),
wherein said at least one heating element comprises a heating layer at least partially obtained through thermal spraying onto a substrate surface, and
wherein said heating layer is multilayered and comprises at least an insulating layer, a strip conductor and a sealing layer.

2. The road finisher as defined in claim 1 , wherein said heating element comprises a heating layer that has been applied to said substrate surface at least partially by plasma spraying or HVOF.

3. The road finisher as defined in claim 1 , wherein said heating layer is triple-layered, comprising an insulating layer disposed inwardly on a supporting body, a strip conductor applied to said insulating layer and a sealing layer forming the external surface.

4. The road finisher as defined in claim 1 , wherein at least one of said insulating layer or said sealing layer is of alumina based material.

5. The road finisher as defined in claim 1 , wherein said strip conductor consists substantially of nickel, chromium or an alloy including both nickel and chromium.

6. The road finisher as defined in claim 1 , wherein said strip conductor has a meandrous shape.

7. The road finisher as defined in claim 1 , wherein said heating layer is disposed opposite the paving material on the top side of the screed plate.

8. The road finisher as defined in claim 1 , wherein said heating layer is disposed opposite the paving material on the top side of said tamper bar.

9. The road finisher as defined in claim 1 , wherein said heating layer is applied to at least one of the top side of a screed plate or a tamper bar over an intermediate anchor layer.

10. The road finisher as defined in claim 1 , wherein said heating layer has a thickness (D) of approximately 1 mm.

11. A screed plate or a tamper bar comprising a heating layer as defined in claim 1 .

12. The road finisher as defined in claim 1 , wherein said heating element comprises a heating layer that has been applied to said substrate surface entirely by plasma spraying or HVOF.

13. The road finisher as defined in claim 3 , wherein at least one of said insulating layer or said sealing layer is of alumina based material.

14. The road finisher as defined in claim 3 , wherein said strip conductor consists substantially of nickel, chromium or an alloy including both nickel and chromium.

15. The road finisher as defined in claim 3 , wherein said strip conductor has a meandrous shape.

16. The road finisher as defined in claim 4 , wherein said alumina based material comprises alumina with a purity of at least 99.7%.

17. The road finisher as defined in claim 14 , wherein said alumina based material comprises alumina with a purity of at least 99.7%.

Assignees

• Bomag Gmbh

Inventors

• Caputo Gianluca

Classifications

• C23C4/02 Primary

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas · CPC title

• E01C19/4873

  Apparatus designed for railless operation · CPC title

• C23C4/08

  containing only metal elements (C23C4/073 takes precedence) · CPC title

• E01C19/30 Primary

  Tamping or vibrating apparatus other than rollers {; Devices for ramming individual paving elements}({E01C19/41, E01C19/43, E01C19/4833, E01C19/488, E01C19/4886, E01C19/52, E01C21/00, } E01C23/02, E01C23/04 take precedence; vibrated depositing devices E01C19/12; tamping or vibrating rollers E01C19/28; portable percussion tools B25D; tamping or vibrating soil E02D3/046) · CPC title

• C23C4/06

  Metallic material · CPC title