Flat chisel

Abstract

The present invention relates to a chisel (10) having a working portion (12), a shaft portion (14), an insertion end (24), and a longitudinal axis (L) extending through the working portion (12), the shaft portion (14), and the insertion end (24). The working portion (12) is formed with at least one wedge-shaped cutting edge (18) and a rib (22) extending parallel or at least substantially parallel to the longitudinal axis (L) and facing radially away from the longitudinal axis (L). The rib (22) is locally thickened in at least one rib region (36). The chisel (10) allows for particularly uninterrupted and therefore efficient operation.

Description

[Technical Field]

[0001] The present invention relates to a chisel comprising a working section, a shaft section, a shank, and a longitudinal axis extending through the working section, the shaft section, and the shank, the working section being formed with at least one wedge-shaped cutting edge and a rib extending parallel or at least substantially parallel to the longitudinal axis and facing radially away from the longitudinal axis. [Background technology]

[0002] Such chisels are used on construction sites to chisel mineral, such as concrete. However, during chiseling at the work site, it can happen that such chisels get stuck in the stone, which can result in stoppages, lost time, and therefore high costs. If chisel dust gradually remains or accumulates at the work site, especially in the chisel recesses, it may be necessary to interrupt the chisel operation to release the chisel dust at the work site. Summary of the Invention [Problem to be solved by the invention]

[0003] It is therefore an object of the invention to provide a chisel which allows work to be carried out, if possible, without interruptions, or at least with particularly minimal interruptions. [Means for solving the problem]

[0004] This object is achieved by a chisel comprising a working section, a shaft section, a shank and a longitudinal axis extending through the working section, the shaft section and the shank, wherein the working section is formed with at least one wedge-shaped cutting edge and a rib extending parallel or at least substantially parallel to the longitudinal axis and facing radially away from the longitudinal axis, the rib being locally thickened in at least one rib region.

[0005] The rib therefore has a local thickening in the rib region, which may in particular be in the foot region of the rib, which may correspond to the region of the rib facing towards the inside of the chisel, in particular towards the longitudinal axis.

[0006] The inscribed ellipse of the cross section of the rib region may have a larger surface area than the inscribed ellipse of the cross section of the region of the chisel immediately adjacent the rib region.

[0007] For example, in the case of a non-rotationally symmetric chisel, such as a channel chisel, the longitudinal plane of the chisel may also be considered as the longitudinal axis.

[0008] Tests have shown that, for example, when chiseling in a recess, such local thickening can create a free space between the chisel and the recess wall. The chisel can therefore remain mobile even when chiseling in the recess for a long time, even at a considerable depth within the recess. The chisel can therefore be prevented from sticking, or at least the risk of sticking can be significantly reduced, so that fewer or no stops are required to free a stuck chisel from the recess.

[0009] It has further been observed that the local thickening improves the removal of chisel dust. In particular, chisel dust generated during chisel operation can reach the local thickening by its own movement, at least in the region of the upper chisel, i.e., in the direction towards the shank. Due to the continuous back and forth movement of the chisel along its longitudinal axis, the chisel dust can be additionally accelerated, especially during the backward movement, so that it can be thrown out even from relatively deep recesses. As a result of the improved removal, blockages can also be avoided or at least their frequency can be reduced.

[0010] The chisel may be in the form of a flat chisel. For this purpose, the chisel may have a cutting edge that does not vanish, i.e., has a finite cutting edge width. The cutting edge width may be, for example, at least 0.5 cm. The cutting edge may be in the form of a prism. The working section may be tapered toward the cutting edge along at least one dimension.

[0011] It is envisaged that the working section tapers towards the cutting edge in at least two mutually perpendicular dimensions, and thus the chisel, particularly in conjunction with its wedge-shaped cutting edge, can combine the advantages of a flat chisel and a pointed chisel.

[0012] The ribs may extend in multiple dimensions, and in particular the working section may be formed with four ribs, in particular extending parallel or at least substantially parallel to the longitudinal axis and facing radially away from the longitudinal axis.

[0013] At least one of the ribs, several of the ribs, in particular all of the ribs, can be locally thickened.

[0014] At least two of the ribs, in particular two, can extend in the form of transverse ribs along a plane containing the longitudinal axis.

[0015] At least two of the ribs, in particular two, may extend in the form of vertical ribs perpendicular or at least substantially perpendicular to the plane.

[0016] Thus, the at least two transverse ribs and the at least two vertical ribs may have a generally cruciform cross-section.

[0017] To further improve the function of the chisel as a flat chisel, at least one of the vertical ribs can have a height less than at least one of the transverse ribs. Rib height can be understood to mean the maximum distance of all points on the rib from the longitudinal axis. Except for height and orientation, the vertical ribs and transverse ribs can be formed identically on the chisel.

[0018] The transverse ribs can induce fracture of the processed substrate during the chiseling operation, and the vertical ribs can create additional stress in the substrate, further accelerating fracture.

[0019] Such local thickening may be formed in the case of at least one of the transverse ribs, and also, or alternatively, it is conceivable that such local thickening is formed in the case of at least one of the vertical ribs.

[0020] The chisel can be manufactured without machining, in particular by plastic molding, and / or by machining.

[0021] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the invention, with reference to the drawing figures showing the details essential to the invention, and from the claims. The features shown therein should not necessarily be understood to be to scale, but are shown so that the particular features according to the invention can be clearly seen. The various features can be implemented individually by themselves or collectively in any combination in a variant of the invention.

[0022] Exemplary embodiments of the invention are shown in the schematic drawings and explained in detail in the following description. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. [Figure 2] FIG. 1 is a side view of the working section of the chisel. [Figure 3] FIG. 1 is a top view of the working section of the chisel. [Figure 4] FIG. 2 is a cross-sectional view of a chisel. [Figure 5] FIG. 10 shows the working section of a further chisel. [Figure 6] 6 is a cross-sectional view of the chisel according to FIG. 5. [Figure 7] 6 is a cross-sectional view of the chisel according to FIG. 5. [Figure 8] 6 is a cross-sectional view of the chisel according to FIG. 5. DETAILED DESCRIPTION OF THE INVENTION

[0024] In the description of the figures that follows, the use of the same reference signs in each case for identical or functionally corresponding elements facilitates an understanding of the invention.

[0025] 1 shows a side view of a chisel 10. The chisel 10 is in the form of a flat chisel. It has a working section 12, a shaft section 14, and an impact face 16. At the free end of its working section 12, the chisel 10 has a cutting edge 18.

[0026] A longitudinal axis L extends through the working section 12 , the shaft section 14 , and the impact face 16 .

[0027] The chisel 10 can be driven into the substrate 20 by striking its impact surface 16, for example by means of a machine tool (not shown in Figure 1) attached to the area of ​​the impact surface 16. In the example according to Figure 1, the substrate 20 is a mineral substrate, for example reinforced concrete.

[0028] In the exemplary embodiment of the chisel 10 shown in Figure 1, the working section 12 has a plurality of ribs 22. For ease of illustration, only one of the ribs 22 is provided with a reference number in Figure 1.

[0029] Over the life of the chisel 10, the working section 12 typically wears, while the shaft section 14 does not wear, or wears to a maximum extent only to a small extent.

[0030] A shank 24 is formed on the shaft section 14. In the exemplary embodiment shown in Figure 1, the shank 24 can be designed as and / or include a hexagon. Alternatively, the shank 24 could correspond to some other standard, such as the standard commonly referred to as "SDS Plus" or "SDS Max."

[0031] FIG. 2 shows the working section 12 of the chisel 10 in a side view, and FIG. 3 shows it in a top view.

[0032] Working section 12 has a tip zone 26 , an intermediate zone 28 , and a transition zone 30 .

[0033] In the tip zone 26 , the cross section of the chisel 10 decreases along the longitudinal axis L towards the cutting edge 18 .

[0034] The cutting edge itself is in the form of a prism and therefore has a non-vanishing, ie finite, cutting edge width s, for example in the range of 0.5 to 5 cm.

[0035] A total of four ribs 22 are formed in the working section 12. Two ribs 22 extend in the form of vertical ribs 32 along the height dimension HD (see FIG. 2). Two ribs 22 extend in the form of transverse ribs 34 along the width dimension BD (see FIG. 3). They therefore extend along a plane E containing the longitudinal axis L. In the view according to FIG. 3, plane E extends parallel to the image plane of FIG. 3.

[0036] Thus, the vertical ribs 32 extend perpendicular to the plane E.

[0037] In this exemplary embodiment, the vertical ribs 32 on the one hand and the transverse ribs 34 on the other hand are formed in pairs as mirror images of each other.

[0038] In the intermediate zone 28 , the width of the chisel 10 is constant or at least substantially constant, except for locally limited variations, particularly in the ribs 22 .

[0039] In the transition zone 30, the cross section is randomly matched to the adjacent shaft section 14.

[0040] 3, the transverse ribs 34 are locally thickened in the rib regions 36. In this exemplary embodiment, the rib regions 36 are located in the tip zone 26.

[0041] Figure 4 shows a cross section through the working section 12 of the chisel 10 according to section line IV from Figure 3. It can be seen that the vertical ribs 32 have a height HH measured along the height dimension HD that is smaller than the transverse ribs 34, which have a height HS measured along the width dimension BD.

[0042] 5 shows a further chisel working section 12 in a top view. This exemplary embodiment also has transverse ribs 34 that are thickened in a rib region 36. However, in this exemplary embodiment, the rib region 36 is located in the intermediate zone 28. Thus, the rib region 36 is located in a section of the chisel 10 whose overall width is constant, or at least substantially constant.

[0043] 6 to 8 show cross-sectional views of the chisel 10 according to the exemplary embodiment corresponding to FIG. 5 along the section lines VI, VII and VIII from FIG.

[0044] In the foot region 38, the transverse ribs 34 have the same thickness D1 along section lines VI and VIII, as seen in FIGS.

[0045] In the foot region 38, the transverse ribs 34 have a thickness D2 along section line VII as seen in FIG.

[0046] The thickness D2 along the cutting line VII (see FIG. 7) is greater than the thickness D1 along the cutting lines VI and VIII (see FIGS. 6 and 8).

[0047] The ellipse inscribed in the cross section according to Figure 7 has a cross-sectional area A2. The ellipse inscribed in the cross sections according to Figures 6 and 8 each has a cross-sectional area A1. The cross-sectional area A2 is larger than the cross-sectional area A1.

[0048] The minimum distance between the cutting lines VI and VIII, ie the minimum distance at which the thickness of the rib, here the transverse rib 34, increases locally, may be 5 cm or less. [Explanation of symbols]

[0049] 10 Chisel 12 Working Section 14 shaft section 16 Collision surface 18 Cutting Edge 20 Base material 22 Ribs 24 Shank 26 Advanced Zone 28 Intermediate Zone 30 Transition Zone 32 vertical rib 34 Horizontal rib 36 Rib area 38 Foot area A1 cross-sectional area A2 cross-sectional area BD width dimension D1 Thickness D2 Thickness E plane HD height dimension HH Height HS Height IV cutting line VI cutting line VII Cutting line VIII Cutting line L longitudinal axis s Cutting edge width

Claims

1. 1. A chisel (10) comprising a working section (12), a shaft section (14), a shank (24), and a longitudinal axis (L) extending through said working section (12), said shaft section (14), and said shank (24), said working section (12) being formed with at least one wedge-shaped cutting edge (18) and a rib (22) extending parallel or at least substantially parallel to said longitudinal axis (L) and facing radially away from said longitudinal axis (L); A chisel (10) characterized in that said rib (22) is locally thickened in at least one rib region (36).

2. 2. Chisel according to claim 1, characterized in that said chisel (10) is in the form of a flat chisel.

3. 2. Chisel according to claim 1, characterized in that the working section (12) tapers towards the cutting edge (18) in two mutually perpendicular directions (BD, HD).

4. Chisel according to any one of claims 1 to 3, characterized in that the working section (12) is formed with four ribs (22) which extend in particular parallel or at least substantially parallel to the longitudinal axis (L) and face radially away from the longitudinal axis (L).

5. 5. Chisel according to claim 4, characterized in that two of said ribs (22) extend in the form of transverse ribs (34) along a plane (E) containing said longitudinal axis (L).

6. 6. Chisel according to claim 5, characterized in that two of said ribs (22) extend in the form of vertical ribs (32) perpendicular or at least substantially perpendicular to said plane (E).

7. 7. Chisel according to claim 6, characterized in that at least one of said vertical ribs (32) has a height (HH, HS) smaller than at least one of said transverse ribs (34).

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