Road finishing machine with pushing device

Patent metadata

Field	Value
Publication number	US-9656525-B2
Application number	US-201414459529-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Aug 16, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The disclosure relates to a road finishing machine with a chassis and a pushing device. The pushing device comprises at least one docking assembly and at least one absorber unit. The absorber unit is fixed to the chassis of the road finishing machine and comprises at least one piston-cylinder unit which comprises a cylinder and a working piston movable therein which subdivides the piston-cylinder unit into at least one first and one second chambers and is coupled to the docking assembly. The docking assembly may be positioned, by the movably mounted working piston, relative to the chassis between an extended position and at least one retracted position. In the piston-cylinder unit, at least one flow channel is provided between the first and the second chambers for letting a fluid enclosed in the piston-cylinder unit pass through, the fluid being prestressed in the extended position.

First claim

What is claimed is:

1. A road finishing machine comprising:
a chassis; and
a pushing device comprising a docking assembly and an absorber unit, the absorber unit being fixed to the chassis and comprising a piston-cylinder unit, the piston-cylinder unit comprising a cylinder and a working piston that is movable in the cylinder and that divides a chamber of the piston-cylinder unit into a first chamber and a second chamber, wherein the docking assembly is coupled to the working piston and may be positioned relative to the chassis between an extended position and a retracted position by the working piston, wherein the piston-cylinder unit further comprises at least one flow channel disposed in the working piston and provided between the first and second chambers for allowing a fluid enclosed in the piston-cylinder unit to pass through the at least one flow channel, the fluid being prestressed when the docking assembly is in the extended position, wherein the pushing device further comprises at least one one-way valve provided in the working piston for allowing the fluid enclosed in the piston-cylinder unit to pass through the at least one one-way valve when the working piston pushes toward the retracted position, and wherein the at least one one-way valve is configured to allow more of the fluid to pass than the at least one flow channel when the working piston pushes toward the retracted position.

2. The road finishing machine according to claim 1 wherein the prestressed fluid comprises a silicone.

3. The road finishing machine according to claim 1 wherein a flow rate through the at least one one-way valve and/or the at least one flow channel is variable.

4. The road finishing machine according to claim 1 wherein the piston-cylinder unit comprises a guiding section with a guiding piston that is fixed on the working piston.

5. The road finishing machine according to claim 4 wherein at least one vent hole is provided in the guiding section.

6. The road finishing machine according to claim 4 wherein a mounting bore is provided in the working piston for fixing the working piston for assembling the guiding piston.

7. The road finishing machine according to claim 4 wherein the guiding section comprises a guiding bushing within which the guiding piston is movable.

8. The road finishing machine according to claim 7 wherein the guiding bushing is at least partially made of polyoxymethylene (POM).

9. The road finishing machine according to claim 7 further comprising a scraper which secures the guiding bushing in the guiding section.

10. The road finishing machine according to claim 1 wherein the fluid is prestressed with a pressure within a range of 30 bar to 110 bar.

11. The road finishing machine according to claim 1 wherein the piston-cylinder unit comprises a piston bearing which guides the working piston.

12. The road finishing machine according to claim 11 wherein the pushing device comprises a valve in the piston bearing through which the piston-cylinder unit may be filled with the fluid.

13. The road finishing machine according to claim 1 further comprising at least one sensor unit for detecting a position of the pushing device.

14. The road finishing machine according to claim 13 wherein the at least one sensor unit is configured to detect a position of the docking assembly relative to the chassis and/or a position of the working piston.

15. The road finishing machine according to claim 13 wherein the sensor unit is operatively linked with a signal device for optically and/or acoustically indicating a docking state and/or displaying maneuvering instructions for an operator of the road finishing machine and/or a docked truck.

16. The road finishing machine according to claim 1 wherein the road finishing machine is configured to automatically adjust at least one paving parameter and/or one paving drive position when a material supply vehicle has docked to the road finishing machine, and/or the pushing device takes a predetermined position relative to the chassis and/or covers a predetermined damping path X.

17. A road finishing machine comprising:
a chassis; and
a pushing device comprising a docking assembly and an absorber unit, the absorber unit being fixed to the chassis and comprising a piston-cylinder unit, the piston-cylinder unit comprising a cylinder, a working piston that is movable relative to the cylinder and that separates first and second chambers of the piston-cylinder unit, and a guiding section with a guiding piston that is fixed on the working piston, wherein at least one vent hole is provided in the guiding section, wherein the docking assembly is coupled to the working piston and may be positioned relative to the chassis between an extended position and a retracted position by the working piston, and wherein the piston-cylinder unit further comprises at least one flow channel provided between the first and second chambers for allowing a fluid enclosed in the piston-cylinder unit to pass through the at least one flow channel, the fluid being prestressed when the docking assembly is in the extended position.

18. A road finishing machine comprising:
a chassis; and
a pushing device comprising a docking assembly and an absorber unit, the absorber unit being fixed to the chassis and comprising a piston-cylinder unit, the piston-cylinder unit comprising a cylinder and a working piston that is movable relative to the cylinder and that separates first and second chambers of the piston-cylinder unit, and a guiding section with a guiding piston that is fixed on the working piston, wherein a mounting bore is provided in the working piston for fixing the working piston for assembling the guiding piston, wherein the docking assembly is coupled to the working piston and may be positioned relative to the chassis between an extended position and a retracted position by the working piston, and wherein the piston-cylinder unit further comprises at least one flow channel provided between the first and second chambers for allowing a fluid enclosed in the piston-cylinder unit to pass through the at least one flow channel, the fluid being prestressed when the docking assembly is in the extended position.

19. A road finishing machine comprising:
a chassis; and
a pushing device comprising a docking assembly and an absorber unit, the absorber unit being fixed to the chassis and comprising a piston-cylinder unit, the piston-cylinder unit comprising a cylinder and a working piston that is movable relative to the cylinder and that separates first and second chambers of the piston-cylinder unit, and a guiding section with a guiding piston that is fixed on the working piston, wherein the guiding section comprises a guiding bushing within which the guiding piston is movable, wherein the docking assembly is coupled to the working piston and may be positioned relative to the chassis between an extended position and a retracted position by the working piston, and wherein the piston-cylinder unit further comprises at least one flow channel provided between the first and second chambers for allowing a fluid enclosed in the piston-cylinder unit to pass through the at least one flow channel, the fluid being prestressed when the docking assembly is in the extended position.

Assignees

• Joseph Voegele Ag

Inventors

• Gotterbarm Tobias
• Schmidt Thomas

Classifications

• E01C19/48 Primary

  for laying-down the materials and consolidating them, or finishing the surface {, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ (E01C19/002, E01C23/065 take precedence; devices for guiding or controlling the machines along a predetermined path E01C19/004)} · CPC title

• E01C2301/08

  Pushing devices for lorries · CPC title

• B60D3/00 Primary

  Fittings to facilitate pushing · CPC title

• E01C23/06 Primary

  Devices or arrangements for working the finished surface (working freshly laid paving E01C19/42 - E01C19/44, E01C23/02; mining picks E21C35/18); Devices for repairing {or reconditioning} the surface of damaged paving; {Recycling in place or on the road} · CPC title