US 4,493,585 AGranted

Bituminous finisher

AssigneeJoseph Vogele AG

InventorHeinrich Axer

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Abstract

The invention relates to a travelling finisher apparatus for laying down a road surfacing layer of a bituminous compound material, comprising a first precompacting and levelling screed carried by a frame, and optionally a second levelling screed connected to a vibratory drive arrangement, whereby a particularly high degree of compaction is achieved so that subsequent roller compaction is not required. This is accomplished by providing a vertically guided compactor bar extending transversely of the direction of travel at the rear of the first screed and being of substantially narrower width than said first levelling plank, said compactor bar being continually in contact with the surface of the precompacted surfacing layer and adapted to be acted on by linear pulsating forces acting between the frame and the compactor bar, and generated by a drive source the reaction forces of which are absorbed by the frame. As the reaction forces are taken up by the frame, it is possible to make use of the mass inertia of the frame and the components associated therewith for generating extraordinarily high force levels at the compactor bar. Together with the narrow contact surface of the compactor bar, this results in very high area unit loads enabling the required high compaction degrees to be achieved. This is also enhanced by tuning the frequency of the compaction force pulses to the natural frequency of the system. The compactor bar and the levelling screed following it may be divided into sections adapted to be angularly adjusted relative to one another for forming roof- or trough-shaped surface profiles.

A paving machine for use with bituminous composition paving material, comprising a screed substantially rigidly carried by said frame for engagement with substantially uncompacted paving material and whereby the material is spread and substantially levelled as the machine moves forward, said screed having a substantially flat bottom surface which is elongated transversely to said forward direction and which has substantial width in said forward direction, said paving machine being characterized by:

A. a compactor bar having an elongated flat bottom surface which
(1) is substantially equal in length to said bottom surface on the screed and
(2) has a width substantially less than the width of said bottom surface on the screed;
B. means mounting said compactor bar on the frame, rearwardly adjacent to the screed, and whereby the compactor bar
(1) is oriented with the length of its said bottom surface transverse to said forward direction and
(2) is movable substantially freely relative to the frame downwardly from and upwardly to a position in which its said bottom surface is at a level no higher than that of said bottom surface on the screed;
C. force applying means comprising
(1) a reciprocating element that is movable alternately up and down and
(2) substantially undamped resiliently yieldable means connected with said reciprocating element;
D. means connecting said force applying means between the frame and said compactor bar to react between them and so disposing the force applying means that the compactor bar is at all times urged downwardly away from its said position under a force that increases with downward movement of said reciprocating element;
and
E. drive means on the frame for actuating said reciprocating element alternately up and down whereby, during each of a succession of periods that occur at substantially regular intervals, said force upon the compactor bar
(1) is increased substantially steadily from a low value to a maximum value during one part of the period and
(2) is decreased from said maximum value substantially to said low value during another part of the period.

11 more elements

Facts

Application

06/366,004Filed 6 Apr 1982

Priority

DE 31140497 Apr 1981

Granted

15 Jan 1985

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

E01C 19/4853
With tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive…
E01C 19/407
Adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers: with elements or parts partly or fully immersed in or…
E01C 19/4833
For laying-down the materials and consolidating them, or finishing the surface , e.g. slip forms therefor, forming kerbs or gutters in a…: with…
E01C
Construction of, or surfaces for, roads, sports grounds, or the like

Abstract

Claims16