Road structure – process – or apparatus – Apparatus – Material distribution means
Reexamination Certificate
1999-07-23
2001-02-20
Lillis, Eileen D. (Department: 3673)
Road structure, process, or apparatus
Apparatus
Material distribution means
C404S118000, C403S031000
Reexamination Certificate
active
06190087
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a screed for a paver, and more particularly to a paver screed having screed extensions.
Paving machines or pavers generally include a screed which is disposed at the rear of the machine chassis and located behind a distributor auger. Such screeds are typically articulated on the chassis via a pair of tension arms, such that the screed “floats” on the material being laid or paved. In order to enable the screed to be used to pave surfaces having relatively greater working widths, it is known to attach screed lengthening parts or “screed extensions” manually on each side of a main screed. To again pave a surface at the normal width of the main screed, these screed extensions are then manually removed from the main screed.
Such screed extensions are normally mounted onto the main screed by means of threaded fasteners (i.e., fastening screws or bolts) which extend through insertion orifices or mounting holes provided in a side wall of the main screed, such side wall being located at the end of the main screed where an increase in length is desired. Further, the fasteners also typically extend through bores or mounting holes provided in a side wall of the screed extension being mounted, the holes on the extension being substantially aligned with the holes on the main screed. Generally, several threaded fasteners are required to mount a single screed extension, and often multiple extensions are attached to each end of the main screed, depending on the desired overall length of the screed assembly. When it is desired to pave a material mat having a lesser width, as discussed above, the screed extensions must then be removed from the main screed, requiring the removal of numerous threaded fasteners.
Although the above-described extension mounting/removing process is generally effective for varying the overall width of a screed assembly, this process is relatively time-consuming and requires a substantial effort by the person fitting or attaching the screed extension (i.e., the paver operator or a paving crew member). Therefore, it is desirable to provide screed extensions for a screed assembly that may be mounted quickly and with little effort by the paver operators/crew members.
SUMMARY OF THE INVENTION
In one aspect, the present invention is a screed for a paver. The screed has a hydraulic circuit and two outer side walls, at least one of the side walls being provided with an insertion orifice configured for releasable mounting of at least one lateral screed lengthening part. Further, a screed lengthening part has a fastening element capable of being inserted through the insertion orifices. The fastening element comprises a spring accumulator cylinder, the cylinder having a piston spring-loaded into an initial position, being actuatable hydraulically to displace the piston against the spring load and connectable to a hydraulic circuit of the screed. A shank is mounted to the piston and is capable of being inserted through the insertion orifice and being providable with an abutment element.
In another aspect, the present invention is a screed extension for a screed assembly having a main screed. The main screed has two outer side walls, at least one of the side walls having at least one mounting hole. A hydraulic circuit is disposed on the main screed. The screed extension comprises a body having a sidewall and a hydraulic cylinder mounted on the sidewall. The hydraulic cylinder is connectable to the hydraulic circuit of the main screed and has a piston. The piston is spring-loaded into an initial position and has a shank with an abutment portion engageable with the mounting hole of the main screed so as to connect the screed extension with the main screed.
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patent: 4493585 (1985-01-01), Axer
patent: 5116382 (1992-05-01), Steinkamp et al.
patent: 5143331 (1992-09-01), Robert
patent: 5203642 (1993-04-01), Heller et al.
patent: 5308190 (1994-05-01), Raymond
patent: 5344254 (1994-09-01), Sartain
patent: 5924819 (1999-07-01), Breidenbach
patent: 6074118 (2000-06-01), Ferrari et al.
patent: 6079893 (2000-06-01), Seidl et al.
patent: 6089674 (2000-07-01), Whitman
ABG Allgemeine Baumaschinen-Gesellschaft mbH
Hartmann Gary S.
Lillis Eileen D.
Ussai Mark A.
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