Device for compacting road paving materials

• US 8,113,738 B2
• Filed: 01/06/2009
• Issued: 02/14/2012
• Est. Priority Date: 02/02/2008
• Status: Active Grant

• Current Assignee: ABG Allgemeine Baumaschinen-Gesellschaft MgH
• Original Assignee: ABG Allgemeine Baumaschinen-Gesellschaft mbH (Volvo AB)
• Inventors: Mahler, Anton, Niggemann, Marc, Lachmann, Oliver
• Primary Examiner(s): Hartmann, Gary S
• Application Number:
  US12/865,825
• Publication Number:
  US 20110002738A1
• Time in Patent Office: 1,134 Days
• Field of Search: 404/95, 404/118, 404/133.2, 219/672, 219/673
• US Class Current: 404/95
• CPC Class Codes: E01C 19/407 with elements or parts partly or fully immersed in or penetrating into the material to act thereon, e.g. immersed vibrators or vibrating parts, kneading tampers, spaders
• 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 2301/10 Heated screeds

Abstract

The invention relates to a device for compacting road paving materials, comprising a screed board which is fastened on a road finisher and extends at a right angle to the direction of travel of the road finisher and a tamper that is mounted in front and/or behind the screed board. The tamper has a tamper strip that can be driven to perform a striking upward and downward movement and the interior of which is equipped with an electrical heating unit in the form of a rod-shaped heating element that can be clamped into a recess of the tamper strip. The device according to the invention is characterized by a spring accumulator receiving a heating element in the direction of the striking upward and downward movement for clamping the heating element.

Claims

1. A device for compacting road paving materials, comprising a screed which is fastened to a road finisher and extends transversely to the working direction of the finisher, and a tamper which is arranged upstream and/or downstream of said screed and which has a tamper strip which can be driven to perform a striking upward and downward movement (S), said tamper strip being equipped in its interior with an electrical heater in the form of a bar-shaped heating element which can be clamped in a cavity of the tamper strip, characterized in that the heating element is a round-tube heating body whose heating filament is folded over at least once at a free end of the round-tube heating body to form two bars arranged adjacently to one another which are connected in a common connecting block to an electrical supply line.

2. The device as claimed in claim 1, characterized in that the heating filament is designed as a single rod.

3. The device as claimed in claim 1, characterized in that the heating filament forms two rods arranged above or next to one another.

4. The device as claimed in claim 1, characterized in that the connecting block closes the cavity to form a closed space.

5. The device as claimed in claim 1, characterized in that the connecting block is arranged at an end face of the tamper strip.

6. The device as claimed in claim 1, characterized in that the tamper strip has a carrying strip and an impact strip and the cavity is formed in the carrying strip.

7. The device as claimed in claim 6, characterized in that the carrying strip has a groove which is closed via a top surface of the impact strip to form the cavity.

8. The device as claimed in claim 6, characterized in that the carrying strip has a pedestal projecting on the top side for component reinforcement.

9. The device as claimed in claim 6, characterized in that the impact strip has at least two impact strip segments arranged one behind the other.

10. The device as claimed in claim 9, characterized in that the impact strip segments are bridged by a cover plate.

11. The device as claimed in claim 10, characterized in that the cover plate forms the top surface for delimiting the cavity.

12. The device as claimed in claim 6, characterized in that the impact strip is designed as a thin-walled profile.

13. The device as claimed in claim 1, characterized in that, in order to clamp the heating element, a spring accumulator which bears the heating element in the direct of the striking upward and downward movement is provided.

14. The device as claimed in claim 13, characterized in that the spring accumulator is formed by elastic deformation.

15. The device as claimed in claim 13, characterized in that the spring accumulator clamps the heating element along the cavity in such a way that it lies in a play-free manner in the cavity.

16. The device as claimed in claim 13, characterized in that the heating element is designed as a corrugated or zigzag-shaped heating bar whose elastic change in shape forms the spring accumulator.

17. The device as claimed in claim 13, characterized in that the spring accumulator is designed as a corrugated or zigzag-shaped shim whose elastic change in shape forms the spring accumulator.

18. The device as claimed in claim 1, characterized in that, in order to clamp the heating element, a holding strip which bears the heating element in the direction of the striking upward and downward movement is provided.