Road finisher, piston rod for a road finisher, and method for manufacturing an assembly of a piston rod and a tamper bar

Patent metadata

Field	Value
Publication number	US-2018282951-A1
Application number	US-201815997207-A
Country	US
Kind code	A1
Filing date	Jun 4, 2018
Priority date	Nov 18, 2015
Publication date	Oct 4, 2018
Grant date	—

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.

First claim

What is claimed is:

1 - 8 . (canceled)

9 . 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 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.

10 . 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.

11 . The method according to claim 10 , wherein:
the thermal spray coating comprises at least one of a plasma spray coating and a high velocity oxygen fuel spray coating.

12 . The method according to claim 10 , 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.

13 . The method according to claim 10 , further comprising:
providing electrical connections for electrically connecting the heating element to a power source.

14 . The method according to claim 10 , wherein:
the heating layer comprises an insulating layer; and the insulating layer comprises the thermal spray coating.

15 . The method according to claim 10 , wherein:
the heating layer comprises a strip conductor; and the strip conductor comprises the thermal spray coating.

16 . The method according to claim 10 , wherein:
the heating layer comprises a sealing layer; and the sealing layer comprises the thermal spray coating.

17 . The method according to claim 10 , 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.

18 . The method according to claim 10 , 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.

19 . The method according to claim 18 , wherein:
applying the heating layer of the heating element to the surface of the groove comprises thermal spraying of the heating layer.

20 . The method according to claim 19 , wherein:
thermal spraying comprises at least one of plasma spraying and high velocity oxygen fuel spraying.

21 . The method according to claim 19 , wherein:
the heating layer comprises an insulating layer; and thermal spraying of the heating layer comprises thermal spraying of the insulating layer.

22 . The method according to claim 19 , wherein:
the heating layer comprises a strip conductor; and thermal spraying of the heating layer comprises thermal spraying of the strip conductor.

23 . The method according to claim 19 , wherein:
the heating layer comprises a sealing layer; and thermal spraying of the heating layer comprises thermal spraying of the sealing layer.

24 . The piston rod according to claim 9 , wherein:
the heating layer comprises an insulating layer; and the insulating layer comprises the thermal spray coating.

25 . The piston rod according to claim 9 , wherein:
the heating layer comprises a strip conductor; and the strip conductor comprises the thermal spray coating.

26 . The piston rod according to claim 9 , wherein:
the heating layer comprises a sealing layer; and the sealing layer comprises the thermal spray coating.

27 . The piston rod according to claim 9 , 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.

28 . The piston rod according to claim 9 , wherein:
the heating layer is disposed in a groove in the lower surface of the piston rod.

Assignees

• Bomag Gmbh

Inventors

• Caputo Gianluca

Classifications

• E01C19/486

  with non-vibratory or non-percussive pressing or smoothing means; with supplemental elements penetrating the paving to work the material thereof · CPC title

• E01C2301/10

  Heated screeds · CPC title

• E01C19/30

  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

• C23C4/126

  Detonation spraying · CPC title

• C23C4/10

  Oxides, borides, carbides, nitrides or silicides; Mixtures thereof · CPC title