The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 07, 2021
Filed:
Sep. 01, 2020
Wirtgen Gmbh, Windhagen, DE;
Burkhard Frank, Vettelschoß, DE;
Markus Schäfer, Asbach / Hussen, DE;
Abstract
The self-propelled construction machine according to the invention, in particular a road milling machine, stabiliser, recycler or surface miner, has a machine frame, a work roller arranged on the machine frame, and a left-hand edge protectorA arranged on the left-hand side of the work roller in the working direction and a right-hand edge protectorB arranged on the right-hand side of the work roller in the working direction. In order to raise and/or lower the left-hand and/or right-hand edge protectorA,B, a hydraulic system is provided which comprises a hydraulic sourcefor providing hydraulic fluid. The hydraulic system is characterised in that only a single main directional control valvewhich has three switch positions and is associated with a first and a second hydraulic cylinderA,B is provided, which main directional control valve interacts with a first auxiliary directional control valvewhich has two switch positions and is associated with the first hydraulic cylinderA, and with a second auxiliary directional control valvewhich has two switch positions and is associated with the second hydraulic cylinderB, in order to be able to raise and/or lower or floatingly mount the edge protectors.