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

• US 9,249,544 B2
• Filed: 07/31/2014
• Issued: 02/02/2016
• Est. Priority Date: 07/31/2013
• Status: Active Grant

• Current Assignee: Bomag GmbH (FAYAT SAS)
• Original Assignee: Bomag GmbH (FAYAT SAS)
• Inventors: Caputo, Gianluca
• Primary Examiner(s): HARTMANN, GARY S
• Application Number:
  US14/448,704
• Publication Number:
  US 20150037097A1
• Time in Patent Office: 551 Days
• Field of Search: 404/95, 404/118, 219/553
• US Class Current: 1/1
• CPC Class Codes: C23C 4/02 Pretreatment of the material to be coated, e.g. for coating on selected surface areas
• CPC Class Codes: C23C 4/06 Metallic material
• CPC Class Codes: C23C 4/08 containing only metal elements C23C4/073 takes precedence
• CPC Class Codes: C23C 4/12 characterised by the method of spraying
• CPC Class Codes: C23C 4/134 Plasma spraying
• CPC Class Codes: C23C 4/18 After-treatment
• CPC Class Codes: E01C 19/30 Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elementsE01C19/41, 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 Class Codes: E01C 19/4833 with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means E01C19/4806, E01C19/4886 take precedence; combined with rollers E01C19/488
• CPC Class Codes: E01C 19/4873 Apparatus designed for railless operation
• CPC Class Codes: E01C 2301/10 Heated screeds

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.

Claims

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%.