Screed for plaster or cement.

The invention relates to an extractor for producing a fine plane according to the preamble of claim 1.

typically screeds made of wood or metal are used for the removal of a subgrade for paving work in which they are moved transversely to itself along the top of the previously compacted subgrade. Here, teachers are battens previously einzusenken in the subgrade so that the upper edge of the level of the produced fine plane is. Working with these screeds is already far inconvenient and cumbersome, as that pavement bed material such as sand should be moved from a crouching or kneeling working position out.

There have also been developed pullers, to be used by stalks to handle and accordingly in an upright working position.

Finally already screeds have been developed for application to mechanical work tools, but they require an appropriate mechanical expenditure and also establish the weight of the tools on the subgrade particular problems with deformation of the substrate.

In each of these known from practice cases, in particular, problems with the excess material is pushed onto the compacted material and must be taken away from there, so that slightly non-uniform density areas result arise. This often results in the need of Nacharbeiten.Auch after removal of teaching slats from the finished Planum is a filling and touching up regularly required.

A puller of the generic type, which is also provided with a Trap, results from the DE-A-2636355.

The object of the invention is to provide an extractor that is easy to handle and produce a final grade in a quick operation allows that eliminates largely rework.

According to the invention this task by a puller according to the preamble of claim 1 is achieved on the basis of the characterizing features of claim 1.

The Puller invention provides a cutting or peeling Decreasing movement, which presents a significantly lower resistance, the material of the paving bed. Further, provided that the excess material not defers before the straight edge and provides therefore additional resistance, but that is raised there and received in a Trap.

This, in addition to the reduction of applied when stripping movement forces the advantage that the pre-compacted rough planning is not covered with loose material and that also compacted material is lifted at Fort Bring deferred excess material. The remaining here behind the puller material is rather uniform in density.

It is also advantageous to support the straight edge on casters that make it easier, excess material that has accumulated in the capture wells, to depart with the puller. The rollers can also at the peeling motion for a support to teaching slats o. The like. Ensure leveling assistants.

For support on teaching slats is inventively provided in particular that the rollers are adjustable in height with respect to the Abziehlineals, the adjustment will be regularly provided so that the roller is entirely above the cutting edge of Abziehlineals. It can then be arranged teaching slats on the surface of a rough subgrade that the cutting edge extends below the lower edge of this teaching slats. Similarly, teachers can battens on an already constructed fine leveling Strip, on an existing paving or the like are placed -.. The height adjustment allows to produce a final grade at the desired level. The latter also applies for the case that in the strip-wise manufacturing of precise grade level on the one hand a rough planning and on the other hand an already finished fine level exists or that serve on the one hand curb as a reference level and leveling aid.

Further features and advantages of the invention result from the claims and the following description in which an exemplary embodiment is explained in more detail to the subject matter of the invention. In the drawings:<ul><li>Fig. 1 plan view of a puller (herausgebrochenem at the central part),</li><li>Fig. 2 shows a section according to line II-II in Fig. 1 and</li><li>FIG. 3 shows a side view of the puller, as seen in the same direction as in Fig. 2.</li></ul>

The total in the drawing designated 1 puller comprises a straight edge 2, which over several meters is typically elongated and whose middle part is shown broken only for purposes of illustration. The straight edge is supported at its two lateral ends in each case via a support means 3 and 4, the rear side, a pulley 5 or 6 which is mounted in an extending in a predominantly horizontal plane frame 7, or 8, which front side a sensing edge 9 and 10 is formed. The Auflagervorrichtungen 3 and 4 are each connected via a mainly vertically directed column 11,12 to a spindle 13, 14 and a top-side winch 15,16 height adjustment for the spindle with the straight edge. 2 The guide arms 7,8 are further connected via connecting rods 17,18 with end bars 19,20 which allow manipulation of the device in an upright position.

The puller can now be moved similar to a conventional screed about teaching battens 21,22 to 25 to form when moving in the direction of arrow 23 from a rough planning 24 before detaching a fine level behind this. However, it is no longer necessary that the teaching slats or other leveling assistants are sunk to below the desired level of the fine plane, rather the high-lying arrangement of the rollers 5.6 and in particular the Tastkanten 7.8 also allows the use of higher-lying reference edges. Accordingly, the edges already laid paving, running parallel curbs u. The like. Are used. From Fig. 2 and 3 is, inter alia, the vertical offset between the top of the fine plane and the top of the empty bar 21 or 22 can be seen, the latter need not be at the same level, but - particularly of different leveling assistants - also staggered terms heights usable.

At work, both the sensing edge 9 and 10 as well as the role of 5 or 6 of Auflagervorrichtungen 3.4 on the associated teaching slats 21 or 22 is on, the sensing edge 9 or 10 for the height adjustment is crucial, since it the lowermost portion of Abziehlineals adjacent. The sensing edge leads in the illustrated embodiment of a sliding motion, which has the advantage that by the teacher slats 21 and 22 resting sand o. The like. Plaster bed material is stripped.

From Fig. 2, the advantageous form of Abziehlineals be seen, which is made especially for weight reasons of a folded sheet. When moving in the direction of arrow 23, the engagement of Abziehlineals 2 is first formed by a cutting edge 26, behind which the sheet obliquely rising a Aufgleiffläche presents 27th This makes it possible, above the level line picking up the sand or other pavement bed material without the material is moved or pre-circulated. For receiving the lifted material, a collecting tray 28 is formed behind the sliding surface 27, which is the back bordered by a steep salaried carapace 29th Thus the material can be taken up and not fall back on the freshly-made fine level.

Once the well is filled, the puller 1 can be used as a whole cart and proceed on the rollers 5.6, to carry away the excess plaster bed material.

The thus created Puller is overall relatively easy to train, especially since in the drawing broken away for purposes of illustration middle portions of Abziehlineals 2 determine most of the dimensions. Such to-use of handheld device has been found to be advantageous as it allows an easy and clean work, so that the use of machine Planierhilfen that create the complexity and the weight her particular problems, is dispensable.

The straight edge may be divided by the length, the profile shape facilitates a flat, dimensionally stable connection. This also creates the possibility to further push together the subdivided form sheets or pull apart to form different widths. A preferred embodiment provides for a tripartite division of the sheets, so that a symmetrical design with a central part and two of these symmetrically arranged side parts produced for the straight edge 18th The compound can be provided by conventional fittings or other clamping devices. But it is also possible to fit behind the back plate struts to a spindle or Zugseilverstellung.