EP0470045B1 - Chisel with optimised shaft - Google Patents
Chisel with optimised shaft Download PDFInfo
- Publication number
- EP0470045B1 EP0470045B1 EP91810549A EP91810549A EP0470045B1 EP 0470045 B1 EP0470045 B1 EP 0470045B1 EP 91810549 A EP91810549 A EP 91810549A EP 91810549 A EP91810549 A EP 91810549A EP 0470045 B1 EP0470045 B1 EP 0470045B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chisel
- section
- area
- cross
- insertion end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000037431 insertion Effects 0.000 claims abstract description 12
- 238000003780 insertion Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/02—Percussive tool bits
Definitions
- the invention relates to a chisel with a plug-in end for a tool holder for rotary hammers and the like with a chisel part and a shaft arranged between the plug-in end and the chisel part, which has a first region with a constant cross-section from the plug-in end to the chisel part and then a second region with a decreasing circular cross-section.
- the shank between the insertion end and the chisel part provided with a tip is cylindrical.
- a chisel is known from DE-OS 1 073 410, the shaft of which has a cross section which tapers conically towards the chisel.
- a chisel is known from FR-A-30 173, which has a gradation for holding it. While a shoulder at the transition from a smaller to a larger diameter serves to hold the chisel, the smaller diameter creates a tread.
- US-A-4,594,759 shows a surface chiseling machine in which several chisels are held. These chisels are also held in the aforementioned manner, namely over a shoulder at the transition from a smaller to a larger diameter. The smaller diameter of the chisel in turn serves as a tread.
- the invention has for its object to provide a shaft profile for chisels, which is adapted to special working conditions on the chisel part with regard to energy throughput with continuous shock waves.
- the object is achieved in that the second region of the shaft decreases in two stages from the first region to the chisel part and the transitions in the stages are provided with transition radii.
- the cross-sectional changes according to the invention influence the energy throughput at continuous shock waves and the degradation performance and service life of the chisel part are improved compared to purely cylindrical and conical sections between the insertion end and the chisel part.
- Sections of the second region have a constant cross section.
- the smallest cross section of the section of the second region adjoining the chisel part is preferably 0.2 to 0.8 times the cross section of the first region of the shank.
- Such a cross-sectional ratio has an advantageous effect with regard to the mass ratios, the cross-sectional shape being irrelevant.
- the first area of the shaft can have the same or a larger cross section than the insertion end.
- the passage of the shock waves is positively influenced if the length of the section of the second region of the shank lying between the steps suitably corresponds to 0.05 to 0.5 times the total length of the chisel.
- the length of the section of the second region adjoining the chisel part toward the insertion end preferably corresponds to 0.05 to 0.5 times the total length of the chisel.
- transitions in the steps are preferably provided with transition radii.
- a circular profile has an economic effect, in particular from a manufacturing point of view, the cross sections of the first and second regions preferably being circular.
- the chisel 1 shown in FIG. 1 has a shank between an insertion end 2 and a chisel part 5, the first region 3 of which has a constant and the second region 4 of which has a decreasing cross section.
- the decrease in the cross section of the second region 4 takes place in stages, for example in two stages 4a, 4b according to FIG. 1.
- FIG. 2 illustrates the transition at a step 4b by arranging a transition radius R
- FIG. 4 shows the circular cross sections of the two regions 3, 4 which are designed as examples.
- the chisel 6 shown in FIG. 3 in turn has a shaft with a first region 9 and a second region 10 between an insertion end 7 and a chisel part 8.
- the cross section of the first area 9 of the shaft exceeds that of the insertion end 7 in cross section.
- the second area 10 of the shaft again decreases, for example in two stages 10a, 10b. While the cross section of the chisel part 5 corresponds to the smallest cross section of the second area 4 according to the example in FIG. 1, in the example according to FIG. 3 the cross section of the chisel part 8 exceeds the smallest cross section of the second area 10 of the shank.
Abstract
Description
Die Erfindung betrifft einen Meissel mit Einsteckende für eine Werkzeugaufnahme bei Bohrhämmern und dergleichen mit einem Meisselteil sowie einem zwischen Einsteckende und Meisselteil angeordneten Schaft, der vom Einsteckende zum Meisselteil hin einen ersten Bereich mit gleichbleibendem Querschnitt und daran anschliessend einen zweiten Bereich mit abnehmendem Kreisförmigem Querschnitt aufweist.The invention relates to a chisel with a plug-in end for a tool holder for rotary hammers and the like with a chisel part and a shaft arranged between the plug-in end and the chisel part, which has a first region with a constant cross-section from the plug-in end to the chisel part and then a second region with a decreasing circular cross-section.
Im allgemeinen ist bei Meisseln der Schaft zwischen Einsteckende und dem mit einer Spitze versehenen Meisselteil zylindrisch. Aus der DE-OS 1 073 410 ist ein Meissel bekannt, dessen Schaft einen Querschnitt aufweist, der sich zum Meissel hin konisch verjüngt.In general, with chisels, the shank between the insertion end and the chisel part provided with a tip is cylindrical. A chisel is known from DE-OS 1 073 410, the shaft of which has a cross section which tapers conically towards the chisel.
In beiden bekannten Fällen ergibt sich der Nachteil, dass bei stosswellenartiger Belastung der Energiedurchsatz nicht optimal genutzt und damit die Leistung an der Meisselspitze nicht voll erreicht wird.In both known cases, there is the disadvantage that the energy throughput is not optimally used in the event of a shock wave-like load, and therefore the performance at the chisel tip is not fully achieved.
Aus der FR-A-30 173 ist ein Meissel bekannt, der zu seiner Halterung eine Abstufung aufweist. Während eine Schulter am Übergang von einem kleineren zu einem grösseren Durchmesser der Halterung des Meissels dient, wird durch den kleineren Durchmesser eine Lauffläche geschaffen.A chisel is known from FR-A-30 173, which has a gradation for holding it. While a shoulder at the transition from a smaller to a larger diameter serves to hold the chisel, the smaller diameter creates a tread.
Die US-A-4,594,759 zeigt eine Oberflächenmeisselmaschine, in welcher mehrere Meissel gehaltert sind. Auch diese Meissel sind in der vorgenannten Art gehaltert, nämlich über eine Schulter am Übergang von einem kleineren zu einem grösseren Durchmesser. Der kleinere Durchmesser der Meissel dient wiederum als Lauffläche.US-A-4,594,759 shows a surface chiseling machine in which several chisels are held. These chisels are also held in the aforementioned manner, namely over a shoulder at the transition from a smaller to a larger diameter. The smaller diameter of the chisel in turn serves as a tread.
Der Erfindung liegt die Aufgabe zugrunde, ein Schaftprofil für Meissel zu schaffen, das bezüglich Energiedurchsatz bei durchlaufenden Stosswellen an besondere Arbeitsbedingungen am Meisselteil angepasst ist.The invention has for its object to provide a shaft profile for chisels, which is adapted to special working conditions on the chisel part with regard to energy throughput with continuous shock waves.
Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass der zweite Bereich des Schaftes vom ersten Bereich zum Meisselteil hin in zwei Stufen abnimmt und die Übergänge bei den Stufen mit Übergangsradien versehen sind.According to the invention, the object is achieved in that the second region of the shaft decreases in two stages from the first region to the chisel part and the transitions in the stages are provided with transition radii.
Durch die erfindungsgemässen Querschnittsveränderungen wird an den Stufen der Energiedurchsatz bei durchlaufenden Stosswellen beeinflusst und die Abbauleistung und Standzeit am Meisselteil im Vergleich zu rein zylindrischen und konischen Abschnitten zwischen Einsteckende und Meisselteil verbessert.The cross-sectional changes according to the invention influence the energy throughput at continuous shock waves and the degradation performance and service life of the chisel part are improved compared to purely cylindrical and conical sections between the insertion end and the chisel part.
Eine optimale Beeinflussung der Stosswellen wird dann erreicht, wenn in vorteilhafter Weise die an die Stufen anschliessenden Abschnitte des zweiten Bereiches einen gleichbleibenden Querschnitt aufweisen.Optimal influencing of the shock waves is achieved if those adjoining the steps are advantageously used Sections of the second region have a constant cross section.
Vorzugsweise beträgt der kleinste Querschnitt des an das Meisselteil angrenzenden Abschnittes des zweiten Bereiches das 0,2- bis 0,8-fache des Querschnittes des ersten Bereiches des Schaftes. Ein derartiges Querschnittsverhältnis wirkt sich hinsichtlich der Massenverhältnisse vorteilhaft aus, wobei die Querschnittsform unerheblich ist. Der erste Bereich des Schaftes kann dabei gegenüber dem Einsteckende einen gleichen oder grösseren Querschnitt aufweisen.The smallest cross section of the section of the second region adjoining the chisel part is preferably 0.2 to 0.8 times the cross section of the first region of the shank. Such a cross-sectional ratio has an advantageous effect with regard to the mass ratios, the cross-sectional shape being irrelevant. The first area of the shaft can have the same or a larger cross section than the insertion end.
Aus der Sicht der Massen- und Längenverhältnisse wird der Durchlauf der Stosswellen dann positiv beeinflusst, wenn zweckmässigerweise die Länge des zwischen den Stufen liegenden Abschnittes des zweiten Bereiches des Schaftes dem 0,05- bis 0,5-fachen der gesamten Länge des Meissels entspricht. Dabei entspricht in bevorzugter Weise die Länge des zum Einsteckende hin an das Meisselteil anschliessenden Abschnittes des zweiten Bereiches dem 0,05- bis 0,5-fachen der gesamten Länge des Meissels.From the point of view of the mass and length ratios, the passage of the shock waves is positively influenced if the length of the section of the second region of the shank lying between the steps suitably corresponds to 0.05 to 0.5 times the total length of the chisel. The length of the section of the second region adjoining the chisel part toward the insertion end preferably corresponds to 0.05 to 0.5 times the total length of the chisel.
Um zu vermeiden, dass an den Stufen durch Kerbwirkungen und dergleichen Materialbrüche entstehen können, sind die Uebergänge bei den Stufen bevorzugt mit Uebergangsradien versehen.In order to avoid material breakages and similar breakages occurring on the steps, the transitions in the steps are preferably provided with transition radii.
Wirtschaftlich, insbesondere in fertigungstechnischer Sicht, wirkt sich ein kreisförmiges Profil aus, wobei bevorzugt die Querschnitte des ersten und des zweiten Bereiches kreisförmig ausgebildet sind.A circular profile has an economic effect, in particular from a manufacturing point of view, the cross sections of the first and second regions preferably being circular.
Die Erfindung wird nachstehend anhand einer Zeichnung, die Ausführungsbeispiele wiedergeben, näher erläutert. Es zeigen:
- Fig. 1
- einen Meissel gemäss Erfindung in Ansicht,
- Fig. 2
- einen Ausschnitt aus Fig. 1, vergrössert dargestellt,
- Fig. 3
- einen weiteren Meissel gemäss Erfindung in Ansicht,
- Fig. 4
- einen Schnitt längs der Linie A-A der Fig. 1.
- Fig. 1
- a chisel according to the invention in view,
- Fig. 2
- 2 shows a section of FIG. 1, enlarged,
- Fig. 3
- another chisel according to the invention in view,
- Fig. 4
- a section along the line AA of Fig. 1st
Der in Fig. 1 aufgezeigte Meissel 1 weist zwischen einem Einsteckende 2 und einem Meisselteil 5 einen Schaft auf, dessen erster Bereich 3 einen gleichbleibenden und dessen zweiter Bereich 4 einen abnehmenden Querschnitt aufweisen. Die Abnahme des Querschnittes des zweiten Bereiches 4 erfolgt in Stufen, beispielsweise entsprechend Fig. 1 in zwei Stufen 4a, 4b.The
Während Fig. 2 den Uebergang an einer Stufe 4b durch Anordnung eines Uebergangsradius R verdeutlicht, zeigt Fig. 4 die beispielhaft ausgebildeten kreisförmigen Querschnitte der zwei Bereiche 3, 4.2 illustrates the transition at a
Der aus Fig. 3 ersichtliche Meissel 6 weist wiederum zwischen einem Einsteckende 7 und einem Meisselteil 8 einen Schaft mit einem ersten Bereich 9 und einem zweiten Bereich 10 auf. Der Querschnitt des ersten Bereiches 9 des Schaftes übersteigt im Querschnitt denjenigen des Einsteckendes 7. Der zweite Bereich 10 des Schaftes nimmt wiederum ab und zwar beispielhaft in zwei Stufen 10a, 10b. Während gemäss Beispiel der Fig. 1 der Querschnitt des Meisselteiles 5 dem geringsten Querschnitt des zweiten Bereiches 4 entspricht, übersteigt im Beispiel entsprechend Fig. 3 der Querschnitt des Meisselteiles 8 den kleinsten Querschnitt des zweiten Bereiches 10 des Schaftes.The chisel 6 shown in FIG. 3 in turn has a shaft with a first region 9 and a
Claims (5)
- Chisel having an insertion end (2, 7) for a tool receptacle in hammer drills and the like, having a chisel part (5, 8) as well as a shank which is arranged between insertion end (2, 7) and chisel part (5, 8) and has from the insertion end (2, 7) towards the chisel part (5, 8) a first area (3, 9) of constant circular cross-section and adjoining it a second area (4, 10) of decreasing circular cross-section, characterized in that the second area (4, 10) of the shank decreases in two steps (4a, 4b, 10a, 10b) from the first area (3, 9) towards the chisel part (5, 8) and the transitions at the steps (4a, 4b, 10a, 10b) are provided with transition radii (R).
- Chisel according to Claim 1, characterized in that the sections of the second area (4, 10) which adjoin the steps (4a, 4b, 10a, 10b) have a constant cross-section.
- Chisel according to Claim 1 or 2, characterized in that the smallest cross-section of the section of the second area (4, 10) adjacent to the chisel part (5, 8) is 0.2 to 0.8 times the cross-section of the first area (3, 9) of the shank.
- Chisel according to one of the Claims 1 to 3, characterized in that the length of the section of the second area (4, 10) of the shank lying between the steps (4a, 4b, 10a, 10b) corresponds to 0.05 to 0.5 times the total length of the chisel (1, 6).
- Chisel according to one of Claims 1 to 4, characterized in that the length of the section of the second area (4, 10) adjoining the chisel part (5, 8) towards the insertion end (2, 7) corresponds to 0.05 to 0.5 times the total length of the chisel (1, 6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4024650A DE4024650A1 (en) | 1990-08-03 | 1990-08-03 | CHISEL WITH OPTIMIZED SHAFTS |
| DE4024650 | 1990-08-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0470045A1 EP0470045A1 (en) | 1992-02-05 |
| EP0470045B1 true EP0470045B1 (en) | 1995-11-08 |
Family
ID=6411579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91810549A Expired - Lifetime EP0470045B1 (en) | 1990-08-03 | 1991-07-10 | Chisel with optimised shaft |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5145237A (en) |
| EP (1) | EP0470045B1 (en) |
| JP (1) | JP2963794B2 (en) |
| KR (1) | KR100194895B1 (en) |
| AT (1) | ATE129945T1 (en) |
| DE (2) | DE4024650A1 (en) |
| DK (1) | DK0470045T3 (en) |
| ES (1) | ES2078494T3 (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4228985A1 (en) | 1992-08-31 | 1994-03-03 | Hilti Ag | Chisel tool |
| DE4236553A1 (en) * | 1992-10-29 | 1994-05-05 | Hawera Probst Kg Hartmetall | Rock drill |
| DE19901752C2 (en) * | 1999-01-18 | 2003-05-28 | Wallner Design Gmbh | Chisels for stonework |
| DE19940414A1 (en) * | 1999-08-26 | 2001-04-19 | Herwig Bohrtechnik Schmalkalde | Chisel for impact tool has a similar mass as the impact driver for maximum efficiency |
| EP1273396B1 (en) * | 2001-07-06 | 2009-12-30 | Robert Bosch Gmbh | Chisel resp. drill bit |
| DE10244509A1 (en) * | 2002-09-25 | 2004-04-08 | Hilti Ag | Pointed chisel |
| JP2007237369A (en) * | 2006-03-10 | 2007-09-20 | Univ Chuo | Chisel |
| JP4657124B2 (en) * | 2006-03-10 | 2011-03-23 | 学校法人 中央大学 | Chisel |
| JP4691460B2 (en) * | 2006-03-10 | 2011-06-01 | 学校法人 中央大学 | Chisel |
| US10507568B2 (en) * | 2016-12-15 | 2019-12-17 | Caterpillar Inc. | Hammer work tool having multi-position retention collar |
| EP3363596A1 (en) | 2017-02-15 | 2018-08-22 | HILTI Aktiengesellschaft | Cold chisel |
| USD922841S1 (en) | 2019-05-06 | 2021-06-22 | Milwaukee Electric Tool Corporation | Chisel |
| USD923447S1 (en) | 2019-05-06 | 2021-06-29 | Milwaukee Electric Tool Corporation | Chisel |
| USD921465S1 (en) | 2019-05-06 | 2021-06-08 | Milwaukee Electric Tool Corporation | Mortar knife |
| USD922842S1 (en) * | 2019-05-06 | 2021-06-22 | Milwaukee Electric Tool Corporation | Chisel |
| USD922840S1 (en) | 2019-05-06 | 2021-06-22 | Milwaukee Electric Tool Corporation | Chisel |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE524426A (en) * | ||||
| DE1073410B (en) * | 1960-01-14 | Maschinenfabrik Mönninghoff, Bochum | Tool holder for pneumatic hammers | |
| FR30173E (en) * | 1925-03-21 | 1926-03-29 | Meudon Forges Atel | Improvements to pneumatic jackhammers |
| US2629588A (en) * | 1948-03-25 | 1953-02-24 | Neamand Vincent | Tool for breaking concrete and the like |
| US2557195A (en) * | 1949-11-07 | 1951-06-19 | Neamand Vincent | Tool for breaking concrete and the like |
| US4102534A (en) * | 1977-01-10 | 1978-07-25 | Ajax Tool Works, Inc. | Pneumatic hammer |
| US4325437A (en) * | 1980-04-28 | 1982-04-20 | Joy Manufacturing Company | Anvil with trapped fluid |
| JPS61237605A (en) * | 1985-04-13 | 1986-10-22 | 栗田鑿岩機株式会社 | Surface cutting machine for refractory material, concrete material, etc. |
-
1990
- 1990-08-03 DE DE4024650A patent/DE4024650A1/en not_active Withdrawn
-
1991
- 1991-07-10 DE DE59106842T patent/DE59106842D1/en not_active Expired - Fee Related
- 1991-07-10 EP EP91810549A patent/EP0470045B1/en not_active Expired - Lifetime
- 1991-07-10 ES ES91810549T patent/ES2078494T3/en not_active Expired - Lifetime
- 1991-07-10 DK DK91810549.5T patent/DK0470045T3/en active
- 1991-07-10 AT AT91810549T patent/ATE129945T1/en not_active IP Right Cessation
- 1991-07-26 US US07/736,713 patent/US5145237A/en not_active Expired - Lifetime
- 1991-08-02 KR KR1019910013364A patent/KR100194895B1/en not_active IP Right Cessation
- 1991-08-02 JP JP3216614A patent/JP2963794B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2078494T3 (en) | 1995-12-16 |
| JP2963794B2 (en) | 1999-10-18 |
| US5145237A (en) | 1992-09-08 |
| DE4024650A1 (en) | 1992-02-06 |
| ATE129945T1 (en) | 1995-11-15 |
| DK0470045T3 (en) | 1996-03-11 |
| EP0470045A1 (en) | 1992-02-05 |
| JPH04226875A (en) | 1992-08-17 |
| DE59106842D1 (en) | 1995-12-14 |
| KR100194895B1 (en) | 1999-06-15 |
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