EP3551819B1 - Construction tool, particularly a grid-type plane and method to manufacture said tool - Google Patents

Description

The invention relates to a construction tool, in particular a robot for processing plaster or plaster base surfaces according to the preamble of claim 1.

Out of US PS 852,991 A robot is known that comprises a plate-like base body in which several working ribs extending transversely to a longitudinal axis of this base body are inserted. These working ribs are made of a flat steel material and each forms a working edge used for processing, in particular smoothing, a plastered surface.

Out of DE 202 11 728 U1 A Rabot is also known which has an essentially rectangular base body formed by numerous, grid-like arranged struts.

Out of EP 2 099 594 B1 A lattice robot is known whose longitudinal webs are manufactured as bent profiles and have a U-shaped cross-section. Openings are formed in the back area of these longitudinal webs through which the material removed during the use of the tool can fall away.

The invention is based on the objective of creating a construction tool of the aforementioned type, in particular a grid robot, which is characterized by high structural strength, offers advantages over previous designs from a handling perspective, and can also be manufactured more cheaply from a manufacturing perspective.

This problem is solved according to the invention by a construction tool with the features specified in claim 1.

This makes it advantageously possible to create a grid robot in which an advantageous distribution of forces and thus a particularly high structural strength results within the grid structure, and in which a handle intended for gripping and handling the grid body can be attached with high strength via the fixing tab.

The U-profile is designed in such a way that it has several preferably rectangular recesses in the back area running between the longitudinal legs, from which material removed from the processed plaster surface by the working webs can escape to the rear out of the grid robot.

The base body is preferably designed to form a rectangular structure similar to the typical dimensions of corresponding construction tools. The base body is preferably dimensioned such that its longitudinal length is approximately twice its transverse width.

The base body can be designed such that it comprises at least two, preferably three, longitudinally extending U-profile elements.

The base body according to the invention preferably also comprises several transverse webs extending transversely to the longitudinal webs and welded to the longitudinal webs. Preferably, both the longitudinal webs and the transverse webs are provided with cutout sections in the area of the intersections and are interlocked via correspondingly complementary cutout sections. The components are joined so that the working edges defined by the respective webs extend essentially on the same working plane. The longitudinal and transverse webs are preferably welded together in the area of the cutout sections. The corresponding welds are preferably designed as relatively short fillet welds.

The construction tool according to the invention is provided with a handle assembly comprising a handle section located on a handle side of the base body facing away from the working zone. This handle assembly can, in particular, be designed as a bow handle extending longitudinally along the base body. The handle section can, in particular, be provided with a bow core made of flat material, wherein this bow core can be attached to the fixing tabs integrally formed with the U-profile, in particular by screwing, riveting, or pinning.

The working edges defined by the base body are preferably provided with extremely sharp teeth. These teeth can be produced by fine blanking, rolling, or, in particular, cutting. The lamellae can be locally hardened.

According to a further aspect of the present invention, it also comprises a construction tool, in particular a robot for processing plaster or plaster base surfaces, with a base body designed as a grid structure and comprising several working or transverse webs which as such form a working edge area (AK) extending into a working zone, wherein at least two of the aforementioned working or transverse webs are designed as longitudinal legs of a U-profile open towards the working zone, and these U-profiles are manufactured as formed sheet metal cutting parts, wherein the working edge area (AK) has a tooth contour with tooth tips and tooth valleys produced by jet cutting, wherein the tooth contour and the cutting guide are coordinated such that within a starting material plate the tooth tips of one blank extend into the tooth valleys of the adjacent blank.

Brief description of the characters

Figur 1a

eine perspektivische Darstellung eines erfindungsgemäßen Gitter-Rabots,

Figur 1b

eine perspektivische Darstellung eines als U-Profil gestalteten Querstegs eines erfindungsgemäßen Gitter-Rabots mit integral aus dem Blechzuschnitt ausgeklappter Fixierlasche für den Werkzeuggriff,

Figur 1c

eine Querschnitt-Darstellung des Querstegs nach Figur 1b im Bereich der Fixierlasche,

Figur 1d

eine perspektivische Darstellung eines als U-Profil gestalteten Längsstegs eines erfindungsgemäßen Gitter-Rabots mit integral aus dem Blechzuschnitt des U-Profils ausgeklappter Fixierlasche für den Werkzeuggriff,

Figur 2

eine vereinfachte Detaildarstellung zur weiteren Erläuterung des Aufbaus des Basiskörpers eines erfindungsgemäßen Gitter-Rabots, hier mit einem besonders ausgestalteten Längs-Seitensteg,

Figuren 3a, 3b und 3c

unterschiedliche Gestaltungen der Kanten der Arbeitsstege,

Figur 4

eine vereinfachte Darstellung zur Veranschaulichung des Aufbaus eines Basiskörpers mit zwei im Querschnitt U-förmigen Längsprofilen und mehreren hierzu quer verlaufenden U-Profil Querstegen,

Figur 5

ebenfalls eine vereinfachte Schemadarstellung zur Veranschaulichung des Aufbaus eines Basiskörpers, der im Bereich seiner Außenumfangskanten vollständig von entsprechenden Längs- und Querstegen eingesäumt ist,

Figur 6

eine Schemadarstellung zur Veranschaulichung des Aufbaus des erfindungsgemäßen Gitter-Rabots im Bereich einer Kreuzungsstelle eines Längssteges mit einem Quersteg;

Figur 7

eine perspektivische Darstellung einer weiteren Variante eines erfindungsgemäßen Gitter-Rabots mit einem angestellten Stirnkanten-Quersteg;

Figur 8

eine Skizze zur Veranschaulichung eines Schnittverlaufs in einem zur Fertigung der U-Profile vorgesehenen Blechmateriales, wobei es dieser Schnittverlauf ermöglicht, unter reduziertem Verschnittanteil, sowie Schnittlängensparend mit einem Schnitt jeweils zwei Zahnreihen zu fertigen.

Further details and features of the invention will become apparent from the following description in conjunction with the drawing. It shows:

Figure 1a

a perspective view of a grid robot according to the invention,

Figure 1b

a perspective view of a U-shaped crossbar of a grid robot according to the invention with an integrally folded-out fixing tab for the tool handle from the sheet metal blank,

Figure 1c

a cross-sectional view of the cross web according to Figure 1b in the area of the fixing tab,

Figure 1d

a perspective view of a longitudinal web designed as a U-profile of a grid robot according to the invention with a fixing tab for the tool handle folded out integrally from the sheet metal blank of the U-profile,

Figure 2

a simplified detailed illustration to further explain the structure of the base body of a grid robot according to the invention, here with a particularly designed longitudinal side web,

Figures 3a, 3b and 3c

different designs of the edges of the work platforms,

Figure 4

a simplified representation to illustrate the structure of a basic body with two U-shaped longitudinal profiles in cross-section and several U-profile cross ribs running transversely to them,

Figure 5

also a simplified schematic representation to illustrate the structure of a basic body, which is completely enclosed by corresponding longitudinal and transverse webs in the area of its outer circumferential edges,

Figure 6

a schematic representation to illustrate the structure of the grid robot according to the invention in the area of an intersection of a longitudinal web with a transverse web;

Figure 7

a perspective view of a further variant of a grid robot according to the invention with an angled front edge crossbar;

Figure 8

a sketch illustrating a cutting path in sheet metal material intended for the production of U-profiles, whereby this cutting path makes it possible to produce two rows of teeth with one cut, with reduced waste and in a way that saves cutting length.

The in Figure 1 The illustrated construction tool is used for processing plaster or plaster carrier surfaces and comprises a base body 1, which is designed as a grid structure and includes several working webs 2, 3, 4 ... 7, which as such form a working edge area AK that plunges into a working zone.

The construction tool shown here is characterized by the fact that at least two of the aforementioned working webs 2 ... 7 are designed as longitudinal legs of a U-profile element open towards the working zone AK. This results in a particularly robust design of the construction tool, since all longitudinal legs are coupled to a further longitudinal leg via the back area of the corresponding profile element, thereby achieving particularly high internal stiffening and structural strength of the base body. Furthermore, according to the invention, a fixing tab F1, F2, made from a cutout in the U-profile element, is formed on that U-profile element U2 and extends beyond the back surface of the U-profile element U2 facing away from the working zone.

Each U-profile element is preferably designed such that it includes a back section R extending between the longitudinal legs, wherein recesses, for example in the form of rectangular cutouts, are formed in this back section R. The fixing tabs F1, F2 provided here for attaching the handle 8 are formed from a sheet metal section that is erected from a region of the profile element intended to release a recess.

The basic body 1 is preferably designed such that it appears as a rectangular structure in a top view of the work zone AK in a manner known per se.

The basic body 1 is dimensioned such that its length L, measured in the longitudinal direction, is approximately twice as large as its width B, measured perpendicular to the longitudinal direction.

In the embodiment shown here, the base body 1 comprises a total of three longitudinally extending U-profile elements U1, U2, U3 and several (here five) transverse webs Q1, Q2, Q3, Q4 and Q5, also formed by U-profile elements.

The longitudinal profile elements U1, U2 and U3 are joined to the transverse profile elements Q1, Q2, Q3 via notch sections, so that the working edges AK defined by these webs extend on one and the same working plane level.

The grid robot according to the invention is provided with a handle 8 comprising a handle section 8a located on a handle side of the base body facing away from the working zone AK. The handle 8 is designed as a bow handle extending in the longitudinal direction L of the base body. The handle section comprises a bow core, which here is made of a flat steel material and is welded directly to the rear side of the central longitudinal profile U2 via offset sections.

As shown in the illustration Figure 1b As can be seen, it is possible to form the fixing tab F1, F2 integrally with a transverse web Q1, ... Q5. Here, the fixing tab is designed as a rectangular structure, with its upper transverse edge F1K acting as a support surface against which an inner surface of a receiving groove of a handle 8 rests intimately, thus preventing the handle 8 from tilting laterally. In the embodiment shown here, the outer contour of the fixing tab F1, F2 is created directly as a result of the cut made to expose the recess O1. However, it is also possible to design the fixing tab F1, F2 differently, with a frame lying within this maximum contour pattern. The fixing tab F1, F2 can also be formed by welding on an additional layer or by folding out another tab (particularly possible in the variant according to [reference missing]). Figure 1d ) are reinforced.

As shown in the illustration Figure 1c It is evident that it is possible to design the fixing tab F1, F2 in such a way that it represents a flat extension of a working web, in particular a cross web Q2.

As shown in the illustration Figure 1d It is evident that the fixing tab F1, F2 can also be formed integrally with a longitudinal web U2. Here too, the fixing tab F1, F2 is designed as a rectangular structure, with its upper transverse edge F1K again acting as a support surface against which an inner surface of a receiving groove of a handle 8 rests tightly, thus preventing the handle 8 from tilting laterally.

As from Figure 2 As can be seen, it is possible to design the longitudinal leg 7 forming one long side edge of the grid robot at an angle, so that a wall corner area can be worked out particularly effectively with this longitudinal leg 7.

As from Figure 2 As can be seen further, both the longitudinal and transverse webs 6, 9 are provided with notches 10 and are joined together in the area of these notches. The longitudinal and transverse webs are welded together in the area of these notches by the fillet welds indicated here.

In Figure 3a The design of the working zone AK of a longitudinal leg is greatly simplified and shown as a straight edge.

In Figure 3b The design of the AK work zone is depicted as a sawtooth-like, jagged work edge.

In Figure 3c The design of the working edge area AK is illustrated as a trapezoidal tooth working edge.

As can be seen from the representation according to Figure 4 As can be seen, it is possible to form a lattice body from the U-profile elements used in the invention to form the working legs, which has at least two U-profile elements aligned in the longitudinal direction and several transverse profile elements running transversely to them.

In Figure 5 A highly simplified variant of a grid robot according to the invention is also shown, in which a substantially continuous The longitudinal side edge 7, 2 is reached by extending the corresponding longitudinal profile elements and front or rear transverse profile elements to the edge area of the base body 1.

With the grid-shaped robot designed in this way, it is possible to form a pair of longitudinal webs in the inner area that is not made by a U-profile element, but is made solely by inserted flat material webs.

In Figure 6 In a highly simplified manner, a joining area is shown again, as it is realized, for example, between the longitudinal web 4 and the transverse web Q1.

The grid body of the robot according to the invention is preferably made of a high-strength steel material, in particular a corrosion-resistant steel material. The design of the working edges of the grid robot, in particular the serration preferably formed there, is preferably adapted to the specific application. Partially or fully hardened plaster surfaces or plaster base surfaces can be smoothed using the grid robot according to the invention, or roughened with a grit defined by the serration of the working ribs.

The grid-type robot according to the invention is particularly suitable, with appropriate design of the working edges, for roughening plastic surfaces, especially insulating boards, to improve the adhesion of decorative plaster layers.

The profiles can be welded together from below and/or from the back; the welds can be designed as short fillet welds. The joining areas of the profiles can be dimensioned so that the components are joined with a certain amount of pressure, thus ensuring that the components are largely held in the correct position even before the welding process.

It is possible to design the working edges of the grid robot in such a way that it also makes it possible to smooth or plane plastered areas in drywall construction.

In Figure 7 is shown in the form of a perspective view of a further variant of a grid robot according to the invention with an angled end-edge crossbar STL. The preceding descriptions apply analogously to this grid robot.

The end-edge section STL forms an integral part of the front cross-web element Q5', which is manufactured as a bending or forming profile. The angle of attack W is preferably in the range of 60 to 75°. The front working edge AK5 extends within the main working plane E defined by the other working edges. The end-edge section STL makes it possible to advantageously work out internal corner areas with the tool according to the invention, since the end-edge section STL allows access to the innermost corner area.

The main body comprises two longitudinal webs U1 and U2 designed as bent profiles, as well as a side end web U3'. The side end web is designed as a flat profile and forms an essentially flat longitudinal side surface.

The longitudinal webs U1, U2, the side end web U3' and the transverse webs Q1, Q2...Q5' are joined together via joint sections and notches and welded together. The main body is preferably aligned after the individual parts have been assembled and ground smooth in the area of the working edges.

The grid body of the robot according to the invention is preferably made of a high-strength steel material, in particular a corrosion-resistant steel material. The design of the working edges of the grid robot, in particular the serration preferably formed there, is preferably adapted to the specific application. Partially or fully hardened plaster surfaces or plaster base surfaces can be smoothed using the grid robot according to the invention, or roughened with a grit defined by the serration of the working ribs.

The grid-type robot according to the invention is particularly suitable, with appropriate design of the working edges, for roughening plastic surfaces, especially of insulating boards, to improve the adhesion of adhesive layers and decorative plaster layers. It is possible to design the working edges of the grid scraper in such a way that it also allows for smoothing or planing of joint compound areas in drywall construction.

The construction tool presented here is characterized by the fact that at least two of the aforementioned working webs are designed as longitudinal legs of a U-profile element open towards the working zone. This results in a particularly robust design of the construction tool, since all longitudinal legs are coupled to a further longitudinal leg via the back area of the corresponding profile element, thereby achieving particularly high internal stiffening and structural strength of the base body. Furthermore, according to the invention, a fixing tab F1, F2 is formed on the transverse webs Q1, Q5. This fixing tab is made from a cutout in the U-profile element forming the respective transverse web and extends beyond the back surface of the U-profile element Q1, Q5 on a rear surface facing away from the working zone.

Each U-profile element is preferably designed such that it includes a back section R extending between the longitudinal legs, wherein recesses, for example in the form of rectangular cutouts, are formed in this back section R. The fixing tabs F1, F2 provided here for attaching the handle 8 are formed from a sheet metal section that is erected from a region of the profile element intended to release a recess.

As shown in the illustration Figure 8 According to a particular aspect of the present invention, it is possible to cut the sheet metal parts intended for the production of the U-profiles from a sheet metal material as cutting parts, whereby the toothing is realized under a special cutting path that results in two usable and structurally advantageous rows of teeth ZR1 and ZR2 being produced in a single cut. According to the invention, a cutting head follows a "zigzag path" that is designed such that alternating rounded tooth roots and pointed tooth tips are produced. The cutting head is preferably designed as a waterjet cutting head. Alternatively It is also possible to design the cutting head as a laser cutting head or another type of cutting head. In principle, the cutting action according to the invention can also be achieved with a wire EDM device.

Using the approach described above, the material strips M1 and M2 intended for the production of the U-profiles can be cut from sheet metal with minimal waste, forming their interlocking edges. The material strips produced in this way can then be formed into the U-profiles according to the invention by plastic forming ("bending").

Claims (9)

1. A construction tool, in particular a rake for working on plaster or plaster base surfaces, comprising:

   - a base body (1) designed as a grid structure and comprising a plurality of working or transverse webs (2,...7), which as such form a working edge region (AK) extending into a working zone,
   wherein

   - at least two of the aforementioned working or transverse webs (2,...7) are designed as longitudinal legs of a U-profile open towards the working zone,

   - a handle device (8) comprising a handle portion located on a handle side of the base body (1) facing away from the working zone,

   - the handle device is designed as a bow handle extending in the longitudinal direction of the base body, and the handle portion comprises a bow core,
   characterized in that

   - a fixing tab (F1, F2) made from a cutout of the U-profile element is formed on the U-profile element, which fixing tab is located on a back region (R) of the base body facing away from the working zone U-profile element extends above this back region (R),

   - this bow handle is attached to the fixing tab (F1, F2), and

   - this bow core is attached to the fixing tab (F1, F2) formed integrally with the base body.
2. Construction tool according to claim 1, characterized in that the U-profile comprises a back region (R) extending between the longitudinal limbs, and that recesses are formed in this back region (R), and that this fixing tab (F1, F2) is made from a material section exposing this recess.
3. Construction tool according to claim 1 or 2, characterized in that the base body (1) appears as a rectangular structure in a plan view of the working zone (AK).
4. Construction tool according to claim 3, characterized in that the base body (1) is dimensioned such that its length (L) measured in the longitudinal direction is approximately twice as large as its width (B) measured transversely to the longitudinal direction.
5. Construction tool according to at least one of claims 1 to 4, characterized in that the base body (1) comprises two U-profile elements (U1, U3) extending in the longitudinal direction.
6. Construction tool according to at least one of claims 1 to 5, characterized in that the base body comprises longitudinal webs extending in its longitudinal direction and transverse webs (Q1, ... Q5) extending transversely thereto.
7. Construction tool according to at least one of claims 1 to 6, characterized in that the longitudinal webs and the transverse webs are joined together via notched sections, so that the working edges defined by them extend at the same working plane level.
8. Construction tool according to at least one of claims 1 to 7, characterized in that the stirrup core is screwed, riveted, or pinned to the fixing tab formed integrally with the base body.
9. Construction tool according to at least one of claims 1 to 8, characterized in that at least two of the aforementioned working or transverse webs (2,...7) are designed as longitudinal legs of a U-profile open toward the working zone, and

   - these U-profiles are manufactured as formed sheet metal cutting parts,

   - wherein

   - the working edge region (AK) has a tooth contour with tooth tips and tooth valleys, which is created by jet cutting, wherein the tooth contour and the cutting path are coordinated such that, within a starting material plate, the tooth tips of one blank dip into the tooth valleys of the adjacent blank.