Road finisher with heated tamper bar

• US 9,988,771 B2
• Filed: 11/18/2016
• Issued: 06/05/2018
• 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:
  US15/355,662
• Publication Number:
  US 20170138001A1
• Time in Patent Office: 564 Days
• Field of Search: 404 95, 404114, 404118
• 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 road finisher comprising:

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 present, which is configured so as to heat up a heating surface facing a road subsurface, and wherein the heating element comprises a heating layer at least partially comprising a thermal spray coating; and

a piston rod with connecting means to a tamper bar drive, wherein 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 the connecting means and the lower surface, and in that the heating layer is located between the piston rod and the tamper bar; and

wherein the heating layer comprises at least an insulating layer, a strip conductor, and a sealing layer, and is accommodated in a groove on the lower surface facing the tamper bar.

2. The road finisher according to claim 1, wherein the lower surface of the piston rod which contacts the upper surface of the tamper bar is a lower surface of a base member of the piston rod, the base member extending substantially over the entire length of the upper surface of the tamper bar.

3. The road finisher according to claim 1, wherein the thermal spray coating is a plasma spray coating or a high velocity oxygen fuel spray coating.

4. The road finisher according to claim 2, wherein the heating layer is disposed on the lower surface of the base member, or a support plate provided on the lower surface of the base member.

5. The road finisher according to claim 1, wherein the tamper bar is made from hardened steel.

6. The road finisher according to claim 1, wherein at least the insulating layer and/or the sealing layer are of alumina based material.

7. The road finisher according to claim 1, herein the strip conductor consists substantially of nickel, chromium, or an alloy including both nickel and chromium.

8. The road finisher according to claim 2, wherein electrical connections of the heating element for connecting the heating element to a power source are provided on an upper surface of the base member of the piston rod.