Assembly and method for manufacturing a piston rod and a tamper bar

• US 10,280,571 B2
• Filed: 06/04/2018
• Issued: 05/07/2019
• Est. Priority Date: 11/18/2015
• 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:
  US15/997,207
• Publication Number:
  US 20180282951A1
• Time in Patent Office: 337 Days
• Field of Search: 404 95
• CPC Class Codes: C23C 4/06 Metallic material
• CPC Class Codes: C23C 4/10 Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
• CPC Class Codes: C23C 4/126 Detonation spraying
• CPC Class Codes: C23C 4/134 Plasma spraying
• 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 19/40 adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
• CPC Class Codes: E01C 19/405 with spreading-out, levelling or smoothing means other than the tamping or vibrating means for compacting or smoothing, e.g. with screws for spreading-out the previously dumped material, with non-vibratory lengthwise reciprocated smoothing beam E01C19/407 takes precedence
• 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 19/486 with non-vibratory or non-percussive pressing or smoothing means; with supplemental elements penetrating the paving to work the material thereof
• CPC Class Codes: E01C 2301/10 Heated screeds
• CPC Class Codes: F16M 13/02 for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle

Abstract

A road finisher includes a screed plate extending at right angles to the working direction of the road finisher, a tamper bar disposed rearwardly and/or forwardly of the screed plate in the working direction, wherein at least one electrically operated heating element is configured to heat up a heating surface facing a road subsurface, the heating element comprising a heating layer at least partially obtained through thermal spraying onto a substrate surface, and a piston rod with connecting means to a tamper bar drive. The tamper bar is connected to the piston rod with an upper surface of the tamper bar contacting a lower surface of the piston rod, wherein the piston rod is single-pieced with regard to its connecting means and its lower surface, and the heating layer is located between the piston rod and the tamper bar, especially applied to the lower surface of the piston rod.

Claims

1. A piston rod for a road finisher, the piston rod comprising:

a connecting portion to connect the piston rod to a tamper bar drive,

wherein the piston rod is configured to be connected to a tamper bar with a lower surface of the piston rod contacting an upper surface of the tamper bar, and

wherein a heating layer of a heating element is disposed at the lower surface of the piston rod, wherein the heating layer at least partially comprises a thermal spray coating.

2. The piston rod according to claim 1, wherein:

the heating layer comprises an insulating layer; and

the insulating layer comprises the thermal spray coating.

3. The piston rod according to claim 1, wherein:

the heating layer comprises a strip conductor; and

the strip conductor comprises the thermal spray coating.

4. The piston rod according to claim 1, wherein:

the heating layer comprises a sealing layer; and

the sealing layer comprises the thermal spray coating.

5. The piston rod according to claim 1, wherein:

the heating layer at least partially comprises a multilayered thermal spray coating; and

the multilayered thermal spray coating comprises at least an insulating layer, a strip conductor, and a sealing layer.

6. The piston rod according to claim 1, wherein:

the heating layer is disposed in a groove in the lower surface of the piston rod.

7. A method of manufacturing an assembly of a piston rod and a tamper bar, comprising the following steps:

forming a piston rod having a base member with a lower surface;

forming a tamper bar having an upper surface which, when connected to the piston rod, contacts the lower surface of the base member of the piston rod;

forming a groove in the lower surface of the base member of the piston rod or in the upper surface of the tamper bar;

disposing a heating layer of a heating element in the groove, wherein the heating layer at least partially comprises a thermal spray coating; and

connecting the piston rod to the tamper bar.

8. The method according to claim 7, wherein:

the thermal spray coating comprises at least one of a plasma spray coating and a high velocity oxygen fuel spray coating.

9. The method according to claim 7, wherein:

connecting the piston rod to the tamper bar further comprises screwing screws through the base member of the piston rod and at least partially through the tamper bar.

10. The method according to claim 7, further comprising:

providing electrical connections for electrically connecting the heating element to a power source.

11. The method according to claim 7, wherein:

the heating layer comprises an insulating layer; and

the insulating layer comprises the thermal spray coating.

12. The method according to claim 7, wherein:

the heating layer comprises a strip conductor; and

the strip conductor comprises the thermal spray coating.

13. The method according to claim 7, wherein:

the heating layer comprises a sealing layer; and

the sealing layer comprises the thermal spray coating.

14. The method according to claim 7, wherein:

the heating layer at least partially comprises a multilayered thermal spray coating; and

the multilayered thermal spray coating comprises at least an insulating layer, a strip conductor, and a sealing layer.

15. The method according to claim 7, wherein:

disposing the heating layer of the heating element in the groove further comprises applying the heating layer of the heating element to a surface of the groove.

16. The method according to claim 15, wherein:

applying the heating layer of the heating element to the surface of the groove comprises thermal spraying of the heating layer.

17. The method according to claim 16, wherein:

thermal spraying comprises at least one of plasma spraying and high velocity oxygen fuel spraying.

18. The method according to claim 16, wherein:

the heating layer comprises an insulating layer; and

thermal spraying of the heating layer comprises thermal spraying of the insulating layer.

19. The method according to claim 16, wherein:

the heating layer comprises a strip conductor; and

thermal spraying of the heating layer comprises thermal spraying of the strip conductor.

20. The method according to claim 16, wherein:

the heating layer comprises a sealing layer; and

thermal spraying of the heating layer comprises thermal spraying of the sealing layer.