DE10057124A1 - Chisel for use with electro-pneumatic hammer drill has head and/or shaft with axial profiled apertures, ribs, or webs - Google Patents

Abstract

The chisel, esp. flat or pointed chisel, has a shaft (3) and/or a head (4) with axial apertures (7) and/or ribs or webs (6). These extend parallel to a longitudinal chisel axis (9) and/or a side of the chisel head. The aperture have a semi-circular, U-shaped, or V-shaped cross section, and are pref. defined by ribs/webs along the sides. The apertures in the chisel head are geometrically aligned in direction of the shock waves.

Description

The invention relates to a chisel according to the preamble of Claim 1.

Such chisels have a chisel shank with a round one or hexagonal cross section, the diameter of the Chisel shafts depend, among other things, on the demolition performance which the respective chisel is supposed to produce. Regularly become chisels to increase performance with chisel shafts larger diameter equipped. Because the demolition of a chisel but essentially from the acceleration or the speed at which the chisel hits the earthenware depends on, is the increase in performance of a chisel by increasing the diameter of the Chisel shafts usually counterproductive.

With regard to the chisel head, it is disadvantageous that a massive chisel head always a high one Penetration resistance, which is its performance diminishes. A massive chisel head also acts Because of its large mass negatively on the demolition performance of the Chisel, as this depends essentially on the acceleration or depends on the speed at which the chisel opens  the chisel hits.

The invention has for its object to a chisel develop by the hand-held electro-pneumatic hammer drill optimally generated shock waves forwards to the chisel head. It is also the task of Invention, the penetration resistance of the chisel head too reduce its stability and strength increase the Improve demolition performance and pass through the Shock waves through the chisel head onto the chisel edge or Optimize chisel tip.

This task is based on a chisel after the Preamble of claim 1 according to the invention by the characterizing features of claim 1 solved.

The chisel according to the invention with a chisel head, one Chisel shank and a clamping shank, especially flat or pointed chisels preferably for use in one hand-held electropneumatic hammer drill, e.g. B. with an SDS-Plus or SDS-Max insertion end characterized in that the chisel shank and / or the chisel head Has recesses and / or ribs or webs. In relation the weight of the Chisels reduced compared to conventional chisels and one increased torsional stiffness and higher bending stiffness reached. The provided on the circumference of the chisel shaft Recesses with the formation of rib-like reinforcements are achieved based on role models from nature a lightweight design. Furthermore, the Surface tension reduced because of bending and Torsional stresses in the recesses of the chisel shaft are less than on its peripheral surface. Through the on the Side surface of the chisel head is arranged recesses also greatly reduced the weight of the chisel and the Shock wave impulse optimally distributed on the chisel edge  or concentrated on the chisel tip. By a narrow design of the chisel head reinforced by ribs the penetration behavior of the chisel continues Chiselled goods significantly improved. Lighten the grooves additionally the material removal, since it removes the material Steer the direction of the longitudinal axis of the chisel. For the chisel shaft as well as the chisel head, this "lightweight construction" an inexpensive manufacture of high quality Chisel is possible with simple measures Lifetime and efficiency are increased. Across from Conventional chisels save material is particularly economical because chisels are made of expensive, high-quality steels are made. It is also advantageous that when machining the chisel less volume has to be deformed and thus the Forging machine is spared. The recesses with Reinforcing ribs lead to a considerable one Weight saving resulting from less moving Masses positive on handling a motorized Percussion hammer or a motor-driven Impact drill affects.

Alternatively to the production by e.g. B. Forging is also the Production of the chisel from drawn profile bar possible, e.g. B. as an endless extruded profile, the insertion end either retrospectively or through Machining machined or joined is attached.

The essence of the invention is therefore a reduction in Masses compared to conventional chisel tools, which is indicated by a Kind of "lightweight construction" with recesses and reinforcing ribs or webs is achieved. This applies to both Chisel shank as well as independently for the chisel head.

Due to the small masses, a higher acceleration of the  Tool and thus an increase in demolition performance connected. Despite being lighter, it becomes a substantial one Strength increase of the tool and a considerably higher one Stock removal rate.

An advantageous embodiment of the subject of the invention sees before that the recesses parallel to a longitudinal axis of the chisel and / or run in a cutting surface of the chisel head.

Another advantageous training of Subject of the invention provides the recesses with a semi-circular, U-shaped, V-shaped or trough-shaped To design a cross-section. Such recesses can be easy and with high accuracy.

According to a particular embodiment of the Subject of the invention is provided, the recesses symmetrical or asymmetrical in the chisel head and / or in the To arrange chisel shank to each other. By a symmetrical Arranging the wells, it is possible to take the load of the chisel on the circumference at a level. By a asymmetrical or at least partially asymmetrical Distribution of notches can be deliberately unwanted Vibrations are destroyed as the chisel shank for example differently on bending effects on Scope responded from different directions. Such For example, when chiseling, loads occur in a narrow Gap.

It is advantageous if the recesses are rounded Merge longitudinal edges into a chisel surface. Thus Avoided creating sharp edges due to stress due to torsional stresses and / or bending stresses are particularly sensitive. On such soft transitions from the recesses in the surface of the chisel Stress peaks avoided, which lead to cracks and breakage  or total failure of the chisel.

According to the invention it is further proposed that the Recesses formed open or closed at the end are, with closed ends arcuate into the outer Pass over the chisel surface. Especially with chisels with one compared to the large diameter of the clamping shaft Chisel shank is a transition from one to another Chisel shank with grooves open at the end to the clamping shank particularly advantageous. This makes it special break-prone transition from a small one Cross-sectional area to a large cross-sectional area avoided. Through a closed design of the end Recesses it is possible to transition between Clamping and chisel shank free from interference to hold through the recesses. This can especially be the case with Chisels with a small shaft diameter may be advantageous. Furthermore, "open cross sections" on the chisel shank in the Extrusion processes are produced.

According to the invention it is further proposed that the Chisel head on at least one cutting surface at least one pocket-shaped in plan view in particular approximately triangular or V-shaped or elliptical or U- has a shaped or circular recess. By a such recess, the chip removal is favored, since the Chisels are not removed accidentally, but one Get direction. Furthermore, through these recesses reduces the cross-sectional volume of the bit head and so that Penetration of the chisel is easier. The the Improve recesses in the ridges that delimit the chisel head furthermore the demolition behavior. They effect especially the occurrence of additional punctual Stress peaks in the chisel and thus the breaking off of desired larger pieces of chisel what the Stock removal rate increased.  

The chisel head is through the recesses with Stiffening ribs also provide greater stability Given shape.

It is particularly advantageous if the axes of symmetry of the Recesses on the chisel head parallel or at an angle (α) are arranged to the longitudinal axis of the chisel. Through this alignment the shock waves are on the chisel tip or Chisel edge directed and concentrated.

An expedient embodiment of the subject matter of the invention provides that the longitudinal grooves extend over the entire or stretch almost the entire chisel shank. This indicates the mechanical shank has uniform mechanical properties and can be particularly in the case of torsional loads in extreme cases Give way over the entire length of the shaft without sensitive cross-sectional transitions.

Finally sees further training of the subject the invention, the longitudinal grooves as longitudinal groove sections axially spaced or offset on the circumference of the chisel shaft to arrange. Such an arrangement can in particular longer chisel shafts in all areas of the chisel shank be adapted to the mechanical requirements. So can For example, it may make sense to move from Chisel shank on the clamping end and the chisel head Adjustment of the cross-sectional areas with a larger number of grooves to be provided as the central area of the Chisel shaft.

An advantageous embodiment of the subject of the invention lies also before if the chisel head on its side surface additional surveys to form a kind of "chip breaker" having. These surveys serve as struts that the Chisel head additional stability on sensitive  Lend sections without the chisel head cross-sectional area greatly enlarge.

Further details of the invention are shown in the drawing based on schematically illustrated embodiments described.

Here shows:

Figure 1 is a side view of a chisel with six longitudinal grooves.

FIG. 2 shows a section along the section line II-II through the chisel shown in FIG. 1;

Fig. 3 is a side view of a chisel with three longitudinal grooves;

Fig. 4 is a section along the section line IV-IV shown in Figure 3 by the chisel.

Figure 5 is a side view of a chisel with four longitudinal grooves.

Fig. 6 is a section along the line VI-VI through the chisel shown in Fig. 1;

Figure 5a is a side view of a chisel having a cross section of an airfoil.

Fig. 5b is a right side view of the chisel shown in Fig. 5a;

5c is a side view of another bit with a cross section of an airfoil.

Fig. 5d is a right side view of the chisel shown in Fig. 5c;

FIG. 6a is a view of the bit illustrated in Figure 5a in the direction VIa-VIa.

Figure 6b is a cross section taken along the line VIb-VIb in Figure 5b by the chisel shown..;

Figure 6c is a view of the bit shown in Figure 5c from the viewing direction VIc-VIc..;

Figure 6d is a sectional view taken along the line VId-VId shown in Fig 5d by the chisel..;

Fig. 7 is a sectional view of a chisel shank of a chisel with four open ended grooves;

Fig. 8 is a sectional view of a chisel shank of a chisel having three open ended slots;

9 is a sectional view of a chisel shank of a chisel with six open-ended grooves.

FIG. 10 is an enlarged sectional view along the section line XX of the chisel shown in FIG. 5;

Fig. 11 is an enlarged sectional view taken along the line XI-XI of the chisel shown in Fig. 3;

12 is a sectional view of a chisel shank of a chisel having six closed-end grooves.

Fig. 13 is a side view of a cutter head with elliptical in cross-section recesses;

Fig. 14 is a side view of a cutter head with a cross-sectionally V-shaped Rücksrpüngen;

Fig. 15 is a side view of a cutter head having in cross-section U and triangular recesses;

Fig. 16 is a side view of a cutter head with a triangular cross-sectional recess;

Fig. 17 is a side view of a cutter head with a cross-sectionally U-shaped recesses;

Fig. 18 is a side view of a cutter head;

Fig. 19 is a side view of a cutter head;

Fig. 20 is a side view of a cutter head;

Fig. 21 is a side view of a cutter head;

Fig. 22 is a side view of a cutter head;

FIG. 23 is a further side view of a cutter head;

FIG. 24 is a side view of a wide chisel head;

Fig. 25 is a sectional view taken along the section line XXV-XXV of the bit head shown in Fig. 24;

FIG. 26 shows a variant of a sectional view along the section line XXV-XXV of the chisel head shown in FIG. 24;

FIG. 27 shows a further variant of a sectional view along the section line XXV-XXV of the chisel head shown in FIG. 24.

Description of the embodiments

In Fig. 1, a chisel 1 is shown in side view. This essentially consists of a clamping shank 2 , a chisel shank 3 and a chisel head 4 . The shank 2 has, as SDS-Plus shank engagement grooves to 5, in which the chuck of an unillustrated engaging electrically powered rotary hammer or elktropneumatisch, with which the bit 1 is driven. The chisel shaft 3 has webs or ribs 6 on a surface 6 a, into which recesses 7 are made. The recesses 7 are preferably formed by forging a chisel blank. The recesses 7 have longitudinal edges 8 which run parallel to a longitudinal axis 9 of the chisel. At transitions 10 , 11 , the chisel shank 3 merges into the chisel head 4 or into the clamping shank 2 . The recesses 7 , which are designed as grooves 12 or longitudinal grooves 12 a, have closed ends 13 , 14 toward the transitions 10 , 11 .

FIG. 2 shows a section through the chisel shaft 3 of the chisel 1 shown in FIG. 1 . (In FIGS. 2, 4, 6, 7, 8, 9 the hatching of the cut surfaces is dispensed with in order to keep the figures clearer.) In this sectional view it is clear that the chisel 1 shown in FIG. 1 has six recesses 7 has, which are separated by six webs or ribs 6 . The recesses 7 or the webs or ribs 6 are arranged point-symmetrically to the longitudinal axis 9 of the chisel on the surface 6 a of the chisel 1 .

Fig. 3 shows another chisel 1 , which has three recesses 7 arranged on the surface 6 a of the chisel shaft 3 , which are separated by webs or ribs 6 . The recesses 7 have closed ends 13 towards the chisel head 4 . Go to the shank 2 toward the recesses 7 with open ends 15 in the shank 2 via. Thus, the transition 11 is designed here so that the cross-sectional area changes only slightly from the clamping shank 2 , which has a diameter d, to the chisel shank 3 , which has a diameter D. This is the case because the cross-sectional area of the chisel shaft 3 is calculated from a circular area 16 defined by the diameter D (shown with a broken line in FIG. 4) minus the cross-sectional areas 17 of the recesses 7 .

FIG. 4 shows a section through the chisel shaft 3 of the chisel 1 shown in FIG. 3. This sectional view clearly shows that the chisel 1 shown in FIG. 3 has three recesses 7 , which are arranged point-symmetrically to the longitudinal axis 9 of the chisel on the surface 6 a of the chisel 1 . It can be seen in cross section that the recesses 7 are designed as trough-shaped recesses 18 . Webs or ribs 6 are arranged between the trough-shaped recesses 18 . These webs or ribs 6 serve as reinforcing ribs 19 . The reinforcing ribs 19 give the chisel shaft 3 a rib profile 19 b, which increases the rigidity, strengthening and strengthening of the chisel shaft 3 .

Fig. 5 shows another chisel 1 , which has four recesses 7 arranged on the surface 6 a of the chisel shaft 3 , which are separated by webs or ribs 6 . The recesses 7 run towards the chisel head 4 into closed ends 13 or into open ends 13 '. The recesses 7 with open ends 15 merge into the clamping shaft 2 .

FIG. 6 shows a section through the chisel shaft 3 of the chisel 1 shown in FIG. 5. In this sectional illustration it is clear that the chisel 1 shown in FIG. 5 has four recesses 7 , which are arranged point-symmetrically to the longitudinal axis 9 of the chisel on the surface 6 a of the chisel 1 . In cross section it can be seen that the recesses 7 are designed as part-circular recesses 20 . Webs or ribs 6 are arranged between the part-circular recesses 20 .

Fig. 5a shows another bit 1 in side view. The chisel 1 has a clamping shank 2 , a chisel shank 3 and a chisel head 4 . The chisel head 4 ends in a cutting edge 53 . 3 webs or ribs 6 run parallel to a chisel longitudinal axis 9 on the chisel shaft 3 . These are arranged symmetrically to the longitudinal axis 9 of the chisel.

FIG. 5b shows a side view of the chisel 1 shown in FIG. 5a. In this view, further engagement grooves 5 on the clamping shaft 2 can be seen . The chisel 1 is formed as a flat chisel 52, the chisel shank 3 merges fluently into the bit head. 4

FIG. 6a shows a top view of the cutting edge of 53 of the bit 1 illustrated in Figs. 5a and 5b. The chisel shaft 3 is designed as a profile bar 87 and has a wing profile 88 or a rib profile 88 . This profile 88 has two wings or ribs 6 , 90 , 91 which extend in the direction of the cutting edge 53 . The wings 90 , 91 merge into one another in a fuselage area 92 , the fuselage area 92 being of reinforced design. Compared to the fuselage area 92 , the wings 90 , 91 are designed to be slimmer and thus facilitate penetration of the chisel into the material to be processed. The torsion stiffness and the bending stiffness of the chisel 1 are decisively increased by the reinforced design of the fuselage area 92 .

Fig. 6b shows a section along the line VIB VIb through the in Fig. 5b illustrated view of the bit. 1 In the fuselage area 92 , a rod-shaped core 94 is indicated by a dashed circle 93 , which passes through the chisel shaft 3 and preferably represents a continuation of the clamping shaft 2 . The wings 90 , 91 are designed such that their upper sides 90 a, 91 a and their lower sides 90 b, 91 b extend in the region of the core 94 as tangents 95 to the circle 93 . As a result, the core 94 is enclosed by the wings 90 , 91 and fully integrated. Small ribs 6 are formed at joints 96 , 97 of the tangents 95.

Figs. 5C and 5D show two side views of another bit 1, which is designed as a flat tool 52.

The chisel essentially consists of a clamping shank 2 , a chisel shank 3 and a chisel head 4 . The chisel head 4 ends in a cutting edge 53 . Ribs or webs 6 are arranged on the chisel shaft 3 parallel to the longitudinal axis 9 of the chisel.

Fig. 6c shows a top view of the cutting edge 53 of the in Figure 5c. Bit 1 illustrated. The chisel shaft 3 is designed as a profile bar 87 which has a wing profile or a rib profile 88 . The profile 88 essentially consists of two ribs or wings 6 , 90 , 91 which merge into one another in a fuselage area 92 of the chisel 1 .

FIG. 6d shows a section along the section line VId-VId through the chisel 1 shown in FIG. 5d. A dashed circle 93 indicates a core 94 which passes through the chisel shank 3 and is preferably to be regarded as a continuation of the clamping shank 2 . The wings 90 , 91 have steps 98 on the upper sides 90 a, 91 a and lower sides 90 b, 91 b. The steps 98 widen the wings 6 , 90 , 91 to a chisel longitudinal symmetry plane 89 and at the same time form a further rib-shaped reinforcement 6 . In the area of a chisel transverse symmetry plane 89 ', joints 96 , 97 of the upper sides 90 a, 91 a and the lower sides 90 b, 91 b of the wings 90 , 91 form cusps 99 . These rib-shaped humps 6 , 99 have the function of small transverse wings 100 and serve in particular to increase the torsional and bending stiffness of the profile, the profile design in the area of the chisel shaft avoiding unnecessary mass and thus achieving better energy transmission.

FIG. 7 shows an enlarged view of the section shown in FIG. 6 through the bit shank 3 of the bit 1 shown in FIG. 5. In FIG. 7 it can be seen that the part-circular recesses 20 merge into the webs or ribs 6 of the chisel shaft 3 via rounded longitudinal edges 8 . A dashed circle 21 indicates that the part-circular recess 20 is approximately quarter to semicircular in cross section. The circle 22 indicated by dashed lines shows that the rounded longitudinal edge 8 has an approximately quarter-circular shape in cross section.

FIG. 8 shows an enlarged view of the section shown in FIG. 4 through the chisel shank 3 of the chisel 1 shown in FIG. 3. The trough-shaped recesses 18 give the chisel shaft 3 a polygon-like profile 23 which comes close to a triangular profile 24 (shown in broken lines).

FIG. 9 shows an enlarged view of the section shown in FIG. 2 through the chisel shaft 3 of the chisel 1 shown in FIG. 1 , the sectional view in FIG. 9 showing a chisel 1 with recesses 7 that are open at the end. The recesses 7 are designed here as U-shaped recesses 25 and give the chisel shank 3 a profile 26 which is splined in cross section. Alternatively, it is provided to provide the recesses 25 with a V-shaped cross section 25 a (indicated by dashed lines for example).

Analogous to FIGS. 7 to 9, which show sectional representations of chisel shafts 3 with recesses 7 that are open at the end, FIGS . 10 to 12 show the corresponding chisel shafts 3 with recesses 7 that are closed at the end.

The section shown in FIG. 10 along the section line XX of the chisel 1 shown in FIG. 5 shows the recesses 7 which end in closed ends 13 .

Referring to Figs. 1 to 12 it is clear that the drill collars shown have profiles which have a higher torsional and bending stiffness compared to a conventional round profile with less weight. The weight saving achieved by the recesses allows the bit to be accelerated more quickly by the hammer drill, so that the demolition performance is greater. In addition, this improvement in the mechanical properties improves the transmission of the movement impulses generated by the hammer drill to the bit head, since less energy is lost in the bit shaft due to twisting and bending of the bit shaft. Furthermore, the chisel shank is less sensitive to overloading due to torsion and bending than a conventional round profile, since torsion and bending stresses in the recesses weaken due to the shorter distance to the chisel longitudinal axis.

According to a variant, not shown the chisel shank from a polygonal profile, in particular one Square or pentagonal or hexagonal or octagonal profile, in which the individual side surfaces have recesses. In this way the torsional and bending stiffness of the chisel shaft due to its basic shape and the inserted Grooves improved twice. Alternatively, use is also possible a cross-sectionally oval profile with recesses provided that lead to the formation of ribs. This can preferably with wider spade chisels (spade width up to about 80 mm) for handheld electrical or electropneumatic hammer drills or hammer drills for Come into play.

A further embodiment variant, not shown, is seen before, the longitudinal groove sections on the chisel shaft axially to be spaced apart. For example, three shorter ones Grooves can be arranged one behind the other. Furthermore, the Longitudinal groove sections offset on the circumference of the chisel shaft  be arranged. This way it is possible to create sections with different mechanical properties.

According to a further embodiment variant, the chisel is as Extruded profile made in which the recesses already are molded or subsequently by a Forging and / or machining be introduced. The team will either also by forging and / or Machining or trained as a finished part welded on the chisel shaft.

50 Fig. 13 shows a cutter head of a chisel 40 which merges into an only partially shown chisel stem 51. The chisel head 50 is designed as a flat chisel 52 . This has a cutting edge 53 and a front side surface 54 and a rear side surface 55 . The cutting edge 53 goes over a chisel 72 , which is formed by a front cutting surface 72 a and a rear cutting surface 72 b into the side surfaces 54 , 55 . The bit head 50 is connected to the bit shaft 51 via a neck 56 . Recesses 57 are arranged on the side surfaces 54 , 55 (the side surface 55 cannot be seen in the illustration in FIG. 13). The recesses 57 shown in FIG. 13 have an elliptical cross section 58 . The main axes 59 align the elliptical cross sections 58 approximately parallel to a longitudinal axis 60 of the chisel shaft 51 . Between the recesses 57 there remain webs or ribs 41 which give the chisel head 50 high stability despite the reduction in material. On the rear side surface 55 , the chisel head 50 is designed corresponding to the front side surface 54 , the chisel head is formed symmetrically to a plane 42 , in which the longitudinal chisel 60 and cutting edge 53 lie.

In Fig. 14, a further cutter head 50 is shown, are arranged on the side surfaces 54, 55 U-shaped recesses 61, having the longitudinal axes of the 62nd These are aligned at an angle α to the central longitudinal axis 60 of the chisel shank. The angle α is in a range from approximately 10 ° to 30 ° degrees. As a result of this angled alignment of the U-shaped recesses 61 , the shock waves 63 (symbolically shown as small arrows) generated by a hammer drill, not shown, are also guided on webs or ribs 41 , particularly in edge regions 64 of the cutting edge 53 . The chisel head 50 is formed symmetrically to a plane 42 in which the longitudinal chisel 60 and cutting edge 53 lie.

Fig. 15 shows another embodiment of a chisel head 50. Geometrically different recesses 57 are arranged on the side surfaces 54 , 55 of the chisel head 50 . The recesses 57 arranged on the side surface 54 are a U-shaped recess 61 and two triangular recesses 65 . All recesses 57 are arranged symmetrically to the longitudinal axis 60 of the chisel. The triangular recesses 65 are arranged with base sides 66 at an angle β of approximately 30 ° to the longitudinal axis 60 of the chisel. Shock waves 63 are again indicated by small arrows. The U-shaped recess 61 serves as a wedge 67 , which forces the shock waves 63 from their natural rectilinear course along the longitudinal axis 60 of the chisel to radiate. This radial distribution, which is roughly aligned with the cutting edge 53 , is supported by the triangular recesses 65 . These have the effect that the edge regions 64 are also supplied with shock waves 63 in a targeted manner via detours 67 . The recesses 57 are separated by differently shaped webs or ribs 41 . The chisel head 50 shown in FIG. 15 is also formed symmetrically to a plane 42 in which the chisel longitudinal axis 60 and the cutting edge 53 lie.

Fig. 16 shows a further cutter head 50. The chisel head 50 is designed as a pointed chisel 68 and has a cone-shaped side surface 69 and a cutting tip 70 . A V-shaped recess 71 is arranged on the side surface 69 .

Fig. 17 shows a further tool head 50 of another flat chisel 52, designed on the side surfaces 54, 55 shaped as a U recesses 61 recesses 57 are arranged. This forms ribs or webs 41 on the side surfaces 54 , 55 , which reinforce the bit head 50 . Furthermore, the recesses 57, like all other recesses 57 on the chisel heads 50, assume the function of chip breakers. A large chip (not shown) wedges in the recess 57 and is pushed and broken by the recess 57 and / or the ribs or webs 41 against the unbroken material in a subsequent blow generated by the hammer drill. The chisel head 50 shown in FIG. 17 is also formed symmetrically to a plane 42 in which a chisel longitudinal axis 60 and a cutting edge 53 lie.

In Figs. 18 to 26 further variants are shown of chisel heads 50th

Fig. 18 shows a formed as a flat chisel 52 chisel head 50. This chisel head 50 has a front side surface 54 and a rear side surface 55 . The side surfaces 54 , 55 point to a cutting edge 53 . The cutting edge 53 merges into the cutting surfaces 54 , 55 via a chisel cut 72 . The chisel head 50 has a height H, the chisel cut 72 has a height h. The height h of the chisel cut 72 is approximately 1/15 of the height H of the chisel head 50 . Recesses 57 are arranged on the side surfaces 54 , 55 and are designed as U-shaped recesses 61 . These run towards the cutting edge 53 into the cutting surface 72 a.

Fig. 19 shows a formed as a pointed chisel 68 chisel head 50. The chisel head 50 carries a web or rib 41 designed as a raised portion 73 on a conical jacket-shaped side surface 69 . The elevation 73 has a surface 75 that is curved parallel to the cutting surface 69 . Alternatively, the surface 75 is flat and is aligned with a bisector 76 parallel to a surface line 77 lying on the cutting surface 69 .

Fig. 20 shows a further embodied as a flat chisel 52 chisel head 50. In addition to a cutting edge 53, the chisel head 50 has a chisel cut 72 and a side surface 54 . On the side surface 54 , ribs or webs 41 designed as elevations 73 are arranged, which are formed by elliptical projections 78 . These have a curved surface 75 . According to one embodiment variant, it is provided that the surface 75 is made flat or curved toward the cutting surface 54 . In both versions, elliptical projections 78 are also provided on a rear side surface 55 .

Fig. 21 shows a further embodied as pointed chisel 68 chisel head 50. The chisel head 50 has a recess 57 which is aligned with a cutting tip 70 and is designed as a drop-shaped recess 79 . According to one embodiment variant, the pointed chisel 68 has a further drop-shaped recess 79 on its rear side, not shown.

Fig. 22 shows a 50 bit head of a flat chisel 52, 54 of the two recesses 57 on a front side surface and a recess formed as a rib or web 41 has U-shaped elevation 74. The U-shaped elevation 74 serves to reinforce the chisel head 50 toward a central region 80 of the cutting edge 53 . The recesses 57 designed as triangular recesses 65 serve to save material. Edge areas 82 , 83 of the chisel head 50 are reinforced by ribs or webs 41 . Corresponding deformations are provided on the rear side surface 55 , which cannot be seen.

50 Fig. 23 shows a cutter head of a flat chisel 52, which has two recess 57, which are designed as U-shaped recess 74. At edge regions 82 , 83 , webs or ribs 41 are created by this U-shaped recess 74 , which reinforce the bit head 50 up to a bit cut 72 . In a central area 84 there is also a web or rib 41 which reinforces the chisel head. Corresponding deformations are provided on the rear side surface 55 , which cannot be seen.

Fig. 24 shows a 50 bit head of a flat chisel 52 which has three recesses 57, which are configured as U-shaped recesses 61st These are set back with respect to a side surface 54 and run out at edges 86 without a step into a cutting surface 72 a of a chisel cut 72 . Between the U-shaped recesses 61 are four webs 41 through which the chisel head 50 is reinforced. According to an embodiment variant, which is also represented by FIG. 24, curved ribs 85 or U-shaped ribs 85 are formed on the cutting surface 54 . These also serve to reinforce the bit head 50 .

FIG. 25 shows a section along the section line XXV-XXV through the chisel head 50 shown in FIG. 24. This sectional drawing shows that the U-shaped recesses 61 are formed on the front cutting surface 54 and on the rear cutting surface 55 . The webs or ribs 41 can be seen between the U-shaped recesses 61 . A chisel head cross section 86 is identified by the hatching. Its surface 94 is smaller compared to a dashed-edged surface 95 of a conventional chisel. The area 95 surrounded by dashed lines is calculated by multiplying a bit head thickness D1 by a bit head width B1. The comparison applies to each cross-sectional area comparison carried out in an area A (see FIG. 24).

FIG. 26 shows a section along the section line XXV-XXV through the chisel head 50 shown in FIG. 24. This sectional drawing corresponds to the embodiment variant described in FIG. 24. The ribs 85 which are curved or U-shaped on the side surface 54 can be seen here in section. As can be seen from FIG. 26, the ribs 85 run below the side surface of a conventional chisel head represented by the dashed lines C.

FIG. 27 shows, through the section along the section line XXV-XXV, a further embodiment variant of the chisel head 50 shown in FIG. 24. The chisel head 50 is formed on the side surface 54 analogously to the sectional illustration in FIG. 25 and has U-shaped recesses 61 which are delimited by webs or ribs 41 . On the rear side surface 55 , the chisel head 50 has ribs or webs 41 opposite the U-shaped recesses 61 . The ribs or webs 41 arranged on the front side surface are opposite recesses 57 on the rear side surface 55 . Thus, the chisel head 50 has a cross-sectional shape similar to that of a stiffened sheet.

The invention is not based on those previously described Embodiments limited. It also encompasses more Design variants within the scope of the property right claims.  

Reference list

1

chisel

2nd

Fixture

3rd

Chisel shank

4

Chisel head

5

Engagement grooves

6

Rib or web

6

a surface

7

Recess

8th

Long edge

9

Chisel longitudinal axis

10th

crossing

11

crossing

12th

Groove

12th

a longitudinal groove

13

The End

14

The End

15

The End

16

Circular area

17th

Cross sectional area

18th

trough-shaped recess

19th

Reinforcement rib

19th

a Rib profile

20th

part-circular recess

21

circle

22

circle

23

polygonal profile

24th

Triangular profile

25th

U-shaped recess

25th

V-shaped cross section

26

splined profile

40

chisel

41

Bridge or rib

42

level

50

Chisel head

51

Chisel shank

52

Flat chisel

53

Cutting edge

54

front side surface

55

rear side surface

56

neck

57

Recess

58

elliptical cross section

59

Main axis

60

Chisel longitudinal axis

61

U-shaped recess

62

Longitudinal axis

63

Shock wave

64

Edge area

65

triangular recess

66

Base page

67

detour

68

Pointed chisel

69

cone-shaped side surface

70

Cutting tip

71

V-shaped recess

72

Chisel

72

a cutting surface

72

b cutting surface

73

Survey

74

U-shaped elevation

75

surface

76

bisector

77

Surface line

78

elliptical projection

79

teardrop-shaped recess

80

Middle range

81

triangular elevation

82

Edge area

83

Edge area

84

Middle range

85

rib

86

Chisel head cross section

87

Profile bar

88

Wing profile

89

Chisel longitudinal symmetry level

89

'Chisel transverse symmetry level

90

,

91

wing

90

a top

90

b bottom

91

a top

91

b bottom

92

Trunk area

93

circle

94

core

95

tangent

96

,

97

Joint

98

step

99

Hump

100

Transverse wing

Claims (18)

1. Chisel with a chisel head, a chisel shank and a clamping shank, in particular flat or pointed chisels, preferably for use in a rotary or chisel or percussion hammer, characterized in that the chisel shank ( 3 , 51 ) and / or the chisel head ( 4 , 50 ) has recesses ( 7 , 57 ) and / or ribs ( 6 ) or webs ( 6 ). 2. Chisel according to claim 1, characterized in that axially extending recesses ( 7 , 57 ) and / or ribs or webs ( 6 ) parallel to a longitudinal axis of the chisel ( 9 , 60 ) and / or in a side surface ( 54 , 55 ) of the chisel head (41 50). 3. Chisel according to claim 1, characterized in that the recesses ( 7 , 57 ) have a partially circular ( 20 ), U-shaped ( 25 ), V-shaped ( 25 a) or trough-shaped cross-section ( 18 ), the recesses ( 5 , 57 ) are preferably bounded laterally by ribs or webs ( 6 ). 4. Chisel according to one of the preceding claims, characterized in that the recesses ( 7 , 57 ) are arranged symmetrically or asymmetrically in the chisel head ( 4 , 50 ) and / or in the chisel shank ( 3 , 51 ) to one another. 5. Chisel according to one of the preceding claims, characterized in that the recesses ( 7 , 57 ) with rounded longitudinal edges ( 8 ) in a chisel surface ( 6 a) and / or in adjacent webs or ribs ( 6 ). 6. Chisel according to one of the preceding claims, characterized in that the recesses ( 7 , 57 ) are formed with open ends ( 15 , 13 ') or closed ends ( 13 , 14 ), preferably closed ends ( 13 , 14 ). merge into the chisel surface ( 6 a). 7. Chisel according to one of the preceding claims, characterized in that the recesses ( 7 , 57 ) in the chisel shaft ( 3 , 51 ) and / or in the chisel head ( 4 , 50 ) are formed by an axially extending longitudinal groove ( 12 a). 8. Chisel according to one of the preceding claims, characterized in that the longitudinal grooves ( 12 a) extend over the entire or almost the entire chisel shank ( 3 , 51 ). 9. Chisel according to one of the preceding claims, characterized in that the longitudinal grooves ( 12 a) are axially spaced as longitudinal groove sections or offset on the circumference of the chisel shaft ( 3 , 51 ). 10. Chisel in particular according to one of the preceding claims, characterized in that the chisel head ( 4 , 50 ) on a lateral surface ( 69 ) or at least one side surface ( 54 , 55 ) of at least two ribs or webs ( 6 ) delimited recesses ( 57 ) having. 11. Chisel according to one of the preceding claims, characterized in that the chisel head ( 4 , 50 ) on at least one side surface ( 54 , 55 ) has at least one pocket-shaped, in the top view in particular approximately triangular ( 65 ) or V-shaped ( 71 ) or has elliptical ( 58 ) or U-shaped ( 61 ) or circular recess ( 57 ). 12. Chisel according to one of the preceding claims, characterized in that the axes of symmetry ( 62 , 66 ) of the recesses ( 57 ) on the chisel head ( 4 , 50 ) are arranged parallel or at an angle (α, β) to the chisel longitudinal axis ( 9 , 60 ) are. 13. Chisel according to one of the preceding claims, characterized in that the recesses ( 57 ) on the chisel head ( 4 , 50 ) have a geometric orientation in the direction of the shock wave course. 14. Chisel according to one of the preceding claims, characterized in that the chisel head ( 4 , 50 ) of a flat or spade chisel ( 52 ) stiffening by bead-like on the side surfaces ( 54 , 55 ) opposite webs or ribs ( 41 ) and recesses or depressions ( 57 ). 15. Chisel according to one of the preceding claims, characterized in that at least two ribs ( 6 ) or webs ( 6 ) of the chisel shank ( 3 ) are designed as wings ( 90 , 91 ) or transverse wings ( 100 ). 16. Chisel according to one of the preceding claims, characterized in that the wings ( 90 , 91 ) have upper sides ( 90 a, 91 a) and / or lower sides ( 90 b, 91 b), the tangents (95) to a preferably circular cylindrical Form core ( 94 ). 17. Chisel according to one of the preceding claims, characterized in that the upper sides ( 90 a, 91 a) and / or lower sides ( 90 b, 91 b) of the wings ( 90 , 91 ) at bumps ( 96 , 97 ) humps ( 99 ) or transverse wing ( 100 ). 18. Chisel in particular according to one of the preceding claims, characterized in that the chisel head ( 4 , 50 ) has at least one rib ( 6 ) or a web ( 6 ) on a lateral surface ( 69 ) or at least one side surface ( 54 , 55 ) , which is designed as a crusher edge and / or additional stiffening.