Flat chisel
By designing a partially thickened rib structure on the working section of the chisel, the problem of easy jamming and dust accumulation on the construction site is solved, and the effect of maintaining the mobility of the chisel in the depression and effectively removing chisel dust is achieved.
Patent Information
- Application Number
- CN202380075968.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-12-07
- Filing Date
- 2023-11-30
- Publication Date
- 2025-06-10
AI Technical Summary
Existing chisels used on construction sites are prone to get stuck during work, resulting in shutdowns, wasted time and increased costs, while the accumulation of chisel dust may also require interruption of work for cleaning.
A chisel is designed with ribs and wedge cutting edges on the working section, which are locally thickened in certain areas, and the longitudinal axis extends through the working section, shaft section and handle. This design forms an incisive ellipse in the rib region with a surface area greater than the surface area of the adjacent region, helping to maintain the mobility of the chisel in the depression and improve the removal of chisel dust.
Through the partially thickened rib design, the chisel maintains mobility in the depression, reduces the risk of jamming, reduces the frequency of shutdown, and effectively improves the removal effect of chisel dust, avoiding the interruption required due to dust accumulation.
Smart Images
Figure CN120129587A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a chisel, which includes a working section, a shaft section, a handle, and a longitudinal axis that extends through the working section, the shaft section, and the handle. Wherein, ribs and at least one wedge-shaped cutting edge are formed on the working section, the ribs extend parallel to or at least substantially parallel to the longitudinal axis and radially away from the longitudinal axis. Background Art
[0002] Such chisels are used on construction sites to chisel mineral stones, such as concrete. However, during the chiseling at the work site, it may occur that the chisel gets stuck in the stone, which may lead to work stoppage, time loss, and thus increased costs. If the chisel dust stays more and more at the work site, especially in the chiseled depressions or accumulates in the chiseled depressions, it may also be necessary to interrupt the chiseling work to remove the chisel dust from the work site. Summary of the Invention
[0003] Therefore, the object of the present invention is to provide a chisel that allows work to be carried out without interruption or at least with particularly few interruptions if possible.
[0004] This object is achieved by a chisel that includes a working section, a shaft section, a handle, and a longitudinal axis that extends through the working section, the shaft section, and the handle. Wherein, ribs and at least one wedge-shaped cutting edge are formed on the working section, the ribs extend parallel to or at least substantially parallel to the longitudinal axis and radially away from the longitudinal axis, and wherein the ribs are locally thickened in at least one rib region.
[0005] Therefore, the ribs have local thickenings in the rib regions. The local thickenings can especially be in the base region of the ribs. The base region can correspond to the region of the rib facing the inside of the chisel (especially facing the longitudinal axis).
[0006] The surface area of the inscribed ellipse of the cross-section of the rib region can be greater than the surface area of the inscribed ellipse of the cross-section of the region of the chisel that is directly adjacent to the rib region.
[0007] For example, in the case of a non-rotationally symmetric chisel (such as a groove chisel), the longitudinal plane of the chisel can also be regarded as the longitudinal axis.
[0008] Tests have shown that, for example, when chiseling in a depression, such local thickenings can create a free space between the chisel and the wall of the depression. Therefore, even when chiseling in a depression for a long time and even at a relatively large depth within the depression, the chisel can remain movable. Therefore, it is possible to prevent the chisel from getting stuck, or at least the risk of it getting stuck can be significantly reduced, such that the frequency of work stoppage required is lower or there is no need for work stoppage at all to dislodge the stuck chisel from the depression.
[0009] It has further been observed that the local thickening improves the effect of chisel dust removal. Specifically, the chisel dust generated during the chiseling process can reach at least one area above the local thickening of the chisel (i.e., in the direction towards the shank) by its own movement. By means of the continuous forward and backward movement of the chisel along its longitudinal axis, the chisel dust can be additionally accelerated (especially during the backward movement), so that the chisel dust can even be thrown out from a relatively deep depression. As a result of the improved removal effect, work stoppages can also be avoided, or at least the frequency of work stoppages can be reduced.
[0010] The chisel can be in the form of a flat chisel. For this purpose, the chisel can have a cutting edge with a non-zero (i.e., finite) cutting edge width. For example, the cutting edge width can be at least 0.5 cm. The cutting edge can be in the form of a prism. The working section can taper at least in one dimension at least towards the cutting edge.
[0011] It is conceivable that the working section tapers in at least two mutually perpendicular dimensions towards the cutting edge. Thus, the chisel (especially in combination with its wedge-shaped cutting edge) can combine the advantages of a flat chisel and a pointed chisel.
[0012] The ribs can extend in multiple dimensions. Specifically, four ribs can be formed on the working section, which ribs extend particularly parallel to or at least substantially parallel to the longitudinal axis and radially away from the longitudinal axis.
[0013] At least one rib, a plurality of ribs, especially all ribs, among the ribs can be locally thickened.
[0014] At least two ribs (especially two ribs) among the ribs can extend in the form of lateral ribs along a plane including the longitudinal axis.
[0015] At least two ribs (especially two ribs) among the ribs can extend in the form of vertical ribs perpendicular to or at least substantially perpendicular to the plane.
[0016] Thus, at least two lateral ribs and at least two vertical ribs can generally have a cross-shaped cross-section.
[0017] To further improve the function of the chisel as a flat chisel, the height of at least one of the vertical ribs can be less than the height of at least one of the lateral ribs. The height of the rib can be understood as the maximum distance among all the distances of all points of the rib from the longitudinal axis. Except for the height and orientation, the vertical ribs and the lateral ribs can be formed on the chisel in the same way.
[0018] The lateral ribs can cause fractures in the machined substrate during chiseling. The vertical ribs can generate additional pressure in the substrate and thus additionally accelerate the occurrence of fractures.
[0019] In the case of at least one lateral rib, such a local thickening can be formed. Also or alternatively, it is conceivable that in the case of at least one vertical rib, such a local thickening is formed.
[0020] The chisel can be produced without machining (in particular by plastic shaping and / or by machining).
[0021] Further features and advantages of the invention emerge from the following detailed description of exemplary embodiments of the invention with reference to the drawings and from the claims, which show the essential details of the invention. The features shown therein are not necessarily to be considered in true scale, but are presented in a way that allows the special features according to the invention to be clearly visualized. In variants of the invention, the various features can be implemented individually in themselves or in any combination. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Exemplary embodiments of the invention are shown in schematic diagrams and are explained in detail in the following description.
[0023] In the drawings:
[0024] Figure 1 a chisel is shown,
[0025] Figure 2 a side view of the working section of the chisel is shown,
[0026] Figure 3 a top view of the working section of the chisel is shown,
[0027] Figure 4 a cross-section of the chisel is shown,
[0028] Figure 5 a working section of another chisel is shown, and
[0029] Figures 6 to 8 a cross-section of a chisel according to Figure 5 is shown. DETAILED DESCRIPTION
[0030] In the following description of the drawings, understanding of the invention is facilitated by using the same reference numerals for the same or functionally corresponding elements in each case.
[0031] Figure 1 The chisel 10 is shown in a side view. The chisel 10 is in the form of a flat chisel. The chisel has a working section 12, a shaft section 14, and a striking surface 16. The chisel 10 has a cutting edge 18 at the free end of its working section 12.
[0032] The longitudinal axis L extends through the working section 12, the shaft section 14, and the striking surface 16.
[0033] The chisel 10 can be driven into the substrate 20, for example, by striking on the striking surface 16 of the chisel 10 with a machine tool ( Figure 1 not shown in the figure). In the example according to Figure 1 , the substrate 20 is a mineral substrate, such as reinforced concrete.
[0034] In Figure 1 the exemplary embodiment of the chisel 10 shown, the working section 12 has a plurality of ribs 22. For the sake of simplicity of illustration, only one of the ribs 22 is provided with a reference numeral in Figure 1 .
[0035] During the entire service life of the chisel 10, the working section 12 is generally worn, while the shaft section 14 is not worn or at most worn to an insignificant extent.
[0036] A handle 24 is formed on the shaft section 14. In Figure 1 the exemplary embodiment shown, the handle 24 can be designed to be hexagonal and / or the handle includes such a hexagon. Alternatively, it is also conceivable that the handle 24 corresponds to some other standard, such as the standard commonly referred to as "SDS Plus" or "SDS Max".
[0037] Figure 2 The working section 12 of the chisel 10 is shown in a side view, and Figure 3 the working section of the chisel is shown in a top view.
[0038] The working section 12 has a tip region 26, a middle region 28, and a transition region 30.
[0039] In the tip region 26, the cross-section of the chisel 10 decreases along the longitudinal axis L towards the cutting edge 18.
[0040] The cutting edge itself is in the form of a prism and thus has a non-zero (i.e., finite) cutting edge width s, for example, in the range from 0.5 cm to 5 cm.
[0041] A total of four ribs 22 are formed on the working section 12. Two ribs 22 extend along the height dimension HD in the form of vertical ribs 32 (see Figure 2 ). Two ribs 22 extend along the width dimension BD in the form of lateral ribs 34 (see Figure 3 ). Thus, the lateral ribs extend in a plane E including the longitudinal axis L. In the illustration according to Figure 3 , the plane E extends parallel to Figure 3 the image plane.
[0042] Therefore, the vertical ribs 32 extend perpendicular to the plane E.
[0043] In this exemplary embodiment, on the one hand, the vertical ribs 32 are formed in pairs mirroring each other, and on the other hand, the lateral ribs 34 are formed in pairs mirroring each other.
[0044] In the middle region 28, the width of the chisel 10 is constant or at least substantially constant (in particular except for local limited variations in the ribs 22).
[0045] In the transition region 30, the cross-section is adapted continuously to the adjacent shaft section 14.
[0046] As can be seen with specific reference to Figure 3 the lateral ribs 34 are locally thickened in the rib region 36. In this exemplary embodiment, the rib region 36 is located in the end region 26.
[0047] Figure 4 A cross-section of the chisel 10 through the working section 12 according to section line IV from Figure 3 is shown. It can be seen that the height HH of the vertical ribs 32 (measured specifically along the height dimension HD) is less than the height HS of the lateral ribs 34 (measured along the width dimension BD).
[0048] Figure 5 The working section 12 of another chisel is shown in a top view. This exemplary embodiment also has lateral ribs 34 that are thickened within the rib region 36. However, in this exemplary embodiment, the rib region 36 is located in the middle region 28. Thus, the rib region 36 is located in a section where the total width of the chisel 10 is constant or at least substantially constant.
[0049] Figures 6 to 8 Cross-sectional views of the chisel 10 according to an exemplary embodiment corresponding to Figure 5 are shown according to section lines VI, VII, and VIII from Figure 5 .
[0050] In the base region 38, the lateral ribs 34 have the same thickness D1 along section line VI (as can be seen in Figure 6 ) as along section line VIII (as can be seen in Figure 8 ).
[0051] As can be seen in Figure 7 , in the base region 38, the lateral ribs 34 have a thickness D2 along section line VII.
[0052] The thickness D2 along section line VII (see Figure 7 ) is greater than the thickness D1 along section line VI and section line VIII (see Figure 6 and Figure 8 ).
[0053] Inscribed in accordance withFigure 7 The ellipse in the cross-section has a cross-sectional area A2. The ellipses inscribed in the cross-sections according to Figure 6 and Figure 8 each have a cross-sectional area A1. The cross-sectional area A2 is greater than the cross-sectional area A1.
[0054] The minimum distance between the cross-section line VI and the cross-section line VIII (that is, the minimum distance at which the thickness of the rib in question (here, the lateral rib 34) is locally thickened) can be no more than 5 cm.
[0055] List of reference numerals
[0056] 10 Chisel
[0057] 12 Working section
[0058] 14 Shaft section
[0059] 16 Striking surface
[0060] 18 Cutting edge
[0061] 20 Substrate
[0062] 22 Rib
[0063] 24 Handle
[0064] 26 Tip area
[0065] 28 Intermediate area
[0066] 30 Transition area
[0067] 32 Vertical rib
[0068] 34 Lateral rib
[0069] 36 Rib area
[0070] 38 Base area
[0071] A1 Cross-sectional area
[0072] A2 Cross-sectional area
[0073] BD Width dimension
[0074] D1 Thickness
[0075] D2 Thickness
[0076] E Plane
[0077] HD Height dimension
[0078] HH Height
[0079] HS Height
[0080] IV Section Line
[0081] VI Section Line
[0082] VII Section Line
[0083] VIII Section Line
[0084] L Longitudinal Axis
[0085] s Cutting Edge Width
Claims
1. A chisel (10), the chisel comprising a working section (12), a shank section (14), a handle (24), and a longitudinal axis (L) which extends through the working section (12), the shank section (14), and the handle (24), wherein, a rib (22) and at least one wedge-shaped cutting edge (18) are formed on the working section (12), the rib extending parallel to or at least substantially parallel to the longitudinal axis (L) and radially away from the longitudinal axis (L), characterized in that, the rib (22) is locally thickened in at least one rib region (36).
2. The chisel according to the preceding claim, characterized in that, the chisel (10) is in the form of a flat chisel.
3. The chisel according to any one of the preceding claims, characterized in that, the working section (12) tapers towards the cutting edge (18) in two mutually perpendicular directions (BD, HD).
4. The chisel according to any one of the preceding claims, characterized in that, four ribs (22) are formed on the working section (12), the ribs in particular extending parallel to or at least substantially parallel to the longitudinal axis (L) and radially away from the longitudinal axis (L).
5. The chisel according to any one of the preceding claims, characterized in that, two of the ribs (22) extend in the form of lateral ribs (34) along a plane (E) including the longitudinal axis (L).
6. The chisel according to any one of the preceding claims, characterized in that, two of the ribs (22) extend in the form of vertical ribs (32) perpendicular to or at least substantially perpendicular to the plane (E).
7. The chisel according to any one of the preceding claims, characterized in that, the height (HH, HS) of at least one of the vertical ribs (32) is less than the height of at least one of the lateral ribs (34).