EP3009237A1 - Chisel hammer - Google Patents
Chisel hammer Download PDFInfo
- Publication number
- EP3009237A1 EP3009237A1 EP14189201.8A EP14189201A EP3009237A1 EP 3009237 A1 EP3009237 A1 EP 3009237A1 EP 14189201 A EP14189201 A EP 14189201A EP 3009237 A1 EP3009237 A1 EP 3009237A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- striker
- end ring
- membrane
- working axis
- machine housing
- 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.)
- Withdrawn
Links
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
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0015—Anvils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0019—Guide-sleeves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0057—Details related to cleaning or cooling the tool or workpiece
- B25D2217/0065—Use of dust covers
- B25D2217/0069—Protecting chucks against entering of chip dust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/345—Use of o-rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/365—Use of seals
Definitions
- the present invention relates to a chisel hammer.
- the chisel hammer operates in a dusty environment.
- the moving components in the chisel, in particular the striking mechanism, are susceptible to abrasive wear in the presence of dust. Seals between the tool holder and the striking mechanism are intended to prevent the dust from penetrating the striking mechanism.
- the chisel hammer according to the invention has a tool holder for holding a tool on a working axis, a motor, a machine housing and a striking mechanism.
- the striking mechanism has a bat and a striker arranged in the direction of impact by the bat.
- the racket can be coupled via a pneumatic chamber to a forcibly excited by the engine exciter piston.
- the racket may also be accelerated by a magnetic alternating field generated by magnetic coils.
- a diaphragm seal arranged coaxially with the striker has a flexible membrane which is closed along the working axis at least between a first end ring and a second end ring in the circumferential direction about the working axis.
- the first end ring is secured to a radial surface of the striker and the second end ring is secured in the machine housing or in an element rigidly connected to the machine housing.
- the membrane pulls like a tube over a portion of the bonnet.
- the membrane follows the movement of the beatpiece, the two end rings are stationary on the striker or machine housing.
- the shroud rings are not subject to abrasion wear, such as those found in flying seals based on O-rings. The sealing effect is increased.
- the striker is in a lead that restricts a movement of the striker to a path.
- the length of the membrane from the first end ring to the second End ring may be greater than half the distance, preferably greater than the distance to be.
- the membrane seal is folded at least once in the axial direction or in the radial direction.
- the diaphragm seal may be a bellows seal or a rolling diaphragm seal.
- Fig. 1 schematically shows a chisel hammer 1.
- the chisel hammer 1 has a tool holder 2, in which a shank end 3 of a tool, such as a chisel 4, can be used.
- a primary drive of the chisel hammer 1 is a motor 5, which drives a striking mechanism 6 .
- a battery pack 7 or a power line supplies the motor 5 with power.
- a user can lead the chisel hammer 1 by means of a handle 8 and take the chisel hammer 1 into operation by means of a system switch 9 .
- the impact mechanism 6 beats periodically along the working axis 11, in the direction of impact 10 the bit 4 in a background.
- the percussion 6 is a pneumatic percussion 6.
- An exciter piston 11 and a racket 12 are guided in a guide tube 13 in the striking mechanism 6 along the working axis 14 movable.
- the exciter piston 11 is connected to the motor 5 via an eccentric 15 coupled and forced to a periodic, linear motion.
- a connecting rod 16 connects the eccentric 15 with the excitation piston 11.
- An air spring formed by a pneumatic chamber 17 between the excitation piston 11 and the racket 12 couples a movement of the racket 12 to the movement of the exciter piston 11 .
- the racket 12 can open directly to a rear end of the bit 4 or transferred indirectly through a substantially stationary anvil 18 a portion of its momentum to the bit. 4
- the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 19 .
- the percussion mechanism 6 may also have a beater 13 driven by magnetic coils, which strikes the striker 18 in the direction of impact 11 .
- the striker 18 is movably mounted in a guide 20 along the working axis 14 .
- the user presses the chisel 4 against a background during chiseling operation.
- the bit 4 and the striker 18 is pushed against the direction of impact 10 in the striking mechanism 6 .
- a rear stop 21 of the guide 20 stops the striker 18 against the direction of impact 10.
- the striker 18 is in its working position.
- a front stop 22 limits the free distance 23 around which the striker 18 can slide in the direction of impact 10 .
- the distance 23 is typically between 0.5 cm and 4 cm.
- the front stop 22 is opposite to the direction of impact 10, so from the viewpoint of the tool, in front of the rear stop 21st
- a membrane seal 24 seals within the machine housing 19, the impact mechanism 6 along the working axis 14 relative to the tool holder 2 from ( Fig. 2 ).
- the chisel 4 transports dust into the tool holder 2 during chiseling .
- the membrane seal 24 prevents further transport of the dust through the striker 18 into the lubricated impact mechanism 6.
- the exemplary diaphragm seal 24 is a rolling diaphragm seal.
- the membrane seal 24 has a first end ring 25 and second end ring 26.
- a tubular membrane 27 connects the first end ring 25 with the second end ring 26.
- the membrane 27 terminates in the radial direction a cavity which is open only at the two end rings 25, 26 ,
- the membrane 27 is thin-walled and flexible, so that the first end ring 25 is displaceable relative to the second end ring 26 .
- the first end ring 25 is anchored in the radial surface 28 of the striker 18 .
- the end ring 25 encloses the radial surface 28 about the working axis 14, for example in the region of the largest diameter.
- the second end ring 26 is mounted in the anvil 18 to the surrounding machine housing 19th
- the two end rings 25, 26 are arranged, for example, coaxially to the working axis 14 .
- the tubular membrane 27 is flexible and adapts to the relative arrangement of the two end rings 25, 26 .
- the diaphragm 27 of the rolling diaphragm seal is folded in the radial direction.
- the second end ring 26 is preferably seconded along the working axis 14 midway between the two positions occupied by the first end ring 25 in the striker 18 adjacent the rear stop 21 and adjacent the front stop 22 .
- the length of the membrane 27, ie its dimension along the working axis 14 in the extended state, is preferably greater than half the distance 23 of the striker 18.
- the second end ring 26 may have a larger diameter than the first end ring 25 . The smaller, first end ring 25 emerges during the movement of the striker 18 through the larger, second end ring 26 therethrough.
- the first end ring 25 is in the direction of impact 10 in front of the second end ring 26 when the striker 18 is in the working position; and the first end ring 25 lies in the direction of impact 10 after the second end ring 26 when the striker 18 abuts against the front stop 22 .
- the alternative membrane seal 30 is based on a bellows ( Fig. 3 ).
- the membrane seal 30 also has a first end ring 31 which is fixed to the radial surface 28 of the anvil 18, and a second end ring 32 which is secured to the anvil 18 to the surrounding machine housing 19th
- a flexible, tubular membrane 33 connects the two sealing rings 31, 32.
- the membrane 27 is folded several times along the working axis 14 .
- the two end rings 31, 32 move along the working axis 14 relative to each other when the striker 18 is moved.
- the folded membrane 33 is thereby pushed together or stretched depending on the direction of movement.
- the length of the membrane 27, its dimension along the working axis 14 in the extended state, is preferably greater than the distance 23 of the striker 18th
- Fig. 4 shows an alternative striker 34.
- the striker 34 has a constriction 35.
- the diameter of the striker 18 is in the region of the constriction 35 less than the diameter in the adjacent areas in and against the direction of impact 11.
- the striker 18 is in the working position opposite to the direction of impact 11 at a first stop 36 , which projects radially into the constriction.
- a guide 37 of the striker 18 has a front stop 36 to which the striker 18 is pressed counter to the direction of impact 10 is held in the working position.
- a rear stop 38 stops the movement of the striker 18 in the direction of impact 10. The two stops 38 project into the constriction 35 of the striker 18 in the radial direction.
- the role of the front and the rear stopper is reversed.
- the particular construction of the striker 18 and the associated arrangement of the two stops 36, 38 allows a roll boss seal 39 to be arranged at the end 40 of the striker 18 forwards, ie the tool end, against the direction of impact 11 .
- a first end ring 41 is attached to the tool-side end 40 of the striker 18 .
- a second end ring 42 is attached to the surrounding machine housing 19 .
- the radially folded membrane 43 connects the two end rings 41, 42.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Ein Meißelhammer 1 hat einen Werkzeughalter 2 zum Haltern eines Werkzeugs auf einer Arbeitsachse 14, einen Motor 5, ein Maschinengehäuse 19 und ein Schlagwerk 6. Das Schlagwerk 6 hat einen Schläger 12 und einen in Schlagrichtung 10 von dem Schläger 12 angeordneten Döpper 18. Eine zu dem Döpper 18 koaxial angeordnete Membrandichtung 24 weist eine längs der Arbeitsachse 14 wenigstens zwischen einem ersten Abschlussring 25 und einem zweiten Abschlussring 26 um die Arbeitsachse 14 abgeschlossene, flexible Membran 27 auf. Der erste Abschlussring 25 ist an einer radialen Fläche 28 des Döppers 18 befestigt und der zweite Abschlussring 26 ist in dem Maschinengehäuse 19 befestigt.A chisel hammer 1 has a tool holder 2 for holding a tool on a working axis 14, a motor 5, a machine housing 19 and a percussion 6. The percussion 6 has a racket 12 and arranged in the direction of impact 10 of the racket 12 anvil 18. One to The striker 18 coaxial with the striker 18 has a flexible membrane 27, which is closed along the working axis 14 at least between a first end ring 25 and a second end ring 26 around the working axis 14. The first end ring 25 is fixed to a radial surface 28 of the striker 18 and the second end ring 26 is fixed in the machine housing 19.
Description
Die vorliegende Erfindung betrifft einen Meißelhammer. Der Meißelhammer wird in einer staubigen Umgebung betrieben. Die bewegten Komponenten in dem Meißelhammer, insbesondere das Schlagwerk, sind anfällig für einen abrasiven Verschleiß in Gegenwart von Staub. Dichtungen zwischen der Werkzeugaufnahme und dem Schlagwerk sollen ein Eindringen des Staubs in das Schlagwerk verhindern.The present invention relates to a chisel hammer. The chisel hammer operates in a dusty environment. The moving components in the chisel, in particular the striking mechanism, are susceptible to abrasive wear in the presence of dust. Seals between the tool holder and the striking mechanism are intended to prevent the dust from penetrating the striking mechanism.
Der erfindungsgemäße Meißelhammer hat einen Werkzeughalter zum Haltern eines Werkzeugs auf einer Arbeitsachse, einen Motor, ein Maschinengehäuse und ein Schlagwerk. Das Schlagwerk hat einen Schläger und einen in Schlagrichtung von dem Schläger angeordneten Döpper. Der Schläger kann über eine pneumatische Kammer an einen von dem Motor zwangserregten Erregerkolben angekoppelt sein. Der Schläger kann auch durch ein von Magnetspulen erzeugtes magnetisches Wechselfeld beschleunigt sein. Eine zu dem Döpper koaxial angeordnete Membrandichtung weist eine längs der Arbeitsachse wenigstens zwischen einem ersten Abschlussring und einem zweiten Abschlussring in Umfangsrichtung um die Arbeitsachse abgeschlossene, flexible Membran auf. Der erste Abschlussring ist an einer radialen Fläche des Döppers befestigt und der zweite Abschlussring ist in dem Maschinengehäuse oder in einem starr mit dem Maschinengehäuse verbundenen Element befestigt.The chisel hammer according to the invention has a tool holder for holding a tool on a working axis, a motor, a machine housing and a striking mechanism. The striking mechanism has a bat and a striker arranged in the direction of impact by the bat. The racket can be coupled via a pneumatic chamber to a forcibly excited by the engine exciter piston. The racket may also be accelerated by a magnetic alternating field generated by magnetic coils. A diaphragm seal arranged coaxially with the striker has a flexible membrane which is closed along the working axis at least between a first end ring and a second end ring in the circumferential direction about the working axis. The first end ring is secured to a radial surface of the striker and the second end ring is secured in the machine housing or in an element rigidly connected to the machine housing.
Der Membran zieht sich wie ein Schlauch über einen Abschnitt des Döppers. Die Membran folgt der Bewegung des Döppers, die beiden Abschlussringe sind ortsfest am Döpper bzw. Maschinengehäuse. Die Abschlussringe unterliegen keinem Verschleiß durch Abrieb, wie er sich beispielsweise bei fliegenden Dichtungen basierend auf O-Ringen ergibt. Die Dichtwirkung ist erhöht.The membrane pulls like a tube over a portion of the bonnet. The membrane follows the movement of the beatpiece, the two end rings are stationary on the striker or machine housing. The shroud rings are not subject to abrasion wear, such as those found in flying seals based on O-rings. The sealing effect is increased.
Der Döpper ist in einer Führung, welche eine Bewegung des Döppers auf eine Wegstrecke beschränkt. Die Länge der Membran von dem ersten Abschlussring zu dem zweiten Abschlussring kann größer als die halbe Wegstrecke, vorzugsweise größer als die Wegstrecke sein.The striker is in a lead that restricts a movement of the striker to a path. The length of the membrane from the first end ring to the second End ring may be greater than half the distance, preferably greater than the distance to be.
Eine Ausgestaltung sieht vor, dass die Membrandichtung in axialer Richtung oder in radialer Richtung wenigstens einmal gefaltet ist. Die Membrandichtung kann eine Faltenbalgdichtung oder eine Rollmembrandichtung sein.An embodiment provides that the membrane seal is folded at least once in the axial direction or in the radial direction. The diaphragm seal may be a bellows seal or a rolling diaphragm seal.
Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:
- Fig. 1
- einen Meißelhammer
- Fig. 2
- eine Rollmembrandichtung zwischen Döpper und Maschinengehäuse,
- Fig. 3
- eine Faltenbalgdichtung zwischen Döpper und Maschinengehäuse,
- Fig. 4
- eine Rollmembrandichtung zwischen Döpper und Maschinengehäuse,
- Fig. 1
- a chisel hammer
- Fig. 2
- a rolling diaphragm seal between the striker and the machine housing,
- Fig. 3
- a bellows seal between the striker and the machine housing,
- Fig. 4
- a rolling diaphragm seal between the striker and the machine housing,
Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben.Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise.
Das Schlagwerk 6 ist ein pneumatisches Schlagwerk 6. Ein Erregerkolben 11 und ein Schläger 12 sind in einem Führungsrohr 13 in dem Schlagwerk 6 längs der Arbeitsachse 14 beweglich geführt. Der Erregerkolben 11 ist über einen Exzenter 15 an den Motor 5 angekoppelt und zu einer periodischen, linearen Bewegung gezwungen. Ein Pleuel 16 verbindet den Exzenter 15 mit dem Erregerkolben 11. Eine Luftfeder gebildet durch eine pneumatische Kammer 17 zwischen dem Erregerkolben 11 und dem Schläger 12 koppelt eine Bewegung des Schlägers 12 an die Bewegung des Erregerkolbens 11 an. Der Schläger 12 kann direkt auf ein hinteres Ende des Meißels 4 aufschlagen oder mittelbar über einen im Wesentlichen ruhenden Döpper 18 einen Teil seines Impulses auf den Meißel 4 übertragen. Das Schlagwerk 6 und vorzugsweise die weiteren Antriebskomponenten sind innerhalb eines Maschinengehäuses 19 angeordnet. Das Schlagwerk 6 kann auch einen durch Magnetspulen angetriebenen Schläger 13 aufweisen, der in Schlagrichtung 11 auf den Döpper 18 aufschlägt.The
Der Döpper 18 ist längs der Arbeitsachse 14 beweglich in einer Führung 20 gelagert. Der Anwender drückt im meißelnden Betrieb den Meißel 4 gegen einen Untergrund. Hierdurch wird der Meißel 4 und der Döpper 18 entgegen der Schlagrichtung 10 in das Schlagwerk 6 hineingeschoben. Ein hinterer Anschlag 21 der Führung 20 stoppt den Döpper 18 entgegen der Schlagrichtung 10. Der Döpper 18 ist in seiner Arbeitsstellung. In Folge eines Schlages des Schlägers 12 auf den Döpper 18 oder bei fehlendem Anpressdruck des Meißels 4 gleitet der Döpper 18 in Schlagrichtung 10. Ein vorderer Anschlag 22 beschränkt die freie Wegstrecke 23, um die der Döpper 18 in Schlagrichtung 10 gleiten kann. Die Wegstrecke 23 liegt typischerweise zwischen 0,5 cm und 4 cm. Der vordere Anschlag 22 liegt entgegen der Schlagrichtung 10, also aus Sicht des Werkzeugs, vor dem hinteren Anschlag 21. The
Eine Membrandichtung 24 dichtet innerhalb des Maschinengehäuses 19 das Schlagwerk 6 längs der Arbeitsachse 14 gegenüber dem Werkzeughalter 2 ab (
Die alternative Membrandichtung 30 basiert auf einem Faltenbalg (
Claims (4)
einem Werkzeughalter (2) zum Haltern eines Werkzeugs auf einer Arbeitsachse (14), einem Motor (5),
einem Maschinengehäuse (19),
einem Schlagwerk (6), das einen Schläger (12) und einen in Schlagrichtung (10) von dem Schläger (12) angeordneten Döpper (18) aufweist,
einer zu dem Döpper (18) koaxial angeordnete Membrandichtung (24), die eine längs der Arbeitsachse (14) wenigstens zwischen einem ersten Abschlussring (25) und einem zweiten Abschlussring (26) um die Arbeitsachse (14) abgeschlossene, flexible Membran (27) aufweist, und
der erste Abschlussring (25) an einer radialen Fläche (28) des Döppers (18) befestigt ist und der zweite Abschlussring (26) in dem Maschinengehäuse (19) oder einem am Maschinengehäuse (19) starr befestigten Element (21) befestigt ist.Hand tool (1) with
a tool holder (2) for holding a tool on a working axis (14), a motor (5),
a machine housing (19),
a percussion mechanism (6) comprising a club (12) and an anvil (18) arranged in the striking direction (10) of the club (12),
a membrane seal (24) arranged coaxially with the striker (18) and comprising a flexible membrane (27) which is closed along the working axis (14) at least between a first end ring (25) and a second end ring (26) about the working axis (14). has, and
the first end ring (25) is secured to a radial surface (28) of the striker (18) and the second end ring (26) is secured in the machine housing (19) or an element (21) rigidly secured to the machine housing (19).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14189201.8A EP3009237A1 (en) | 2014-10-16 | 2014-10-16 | Chisel hammer |
PCT/EP2015/073640 WO2016059032A1 (en) | 2014-10-16 | 2015-10-13 | Chisel hammer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14189201.8A EP3009237A1 (en) | 2014-10-16 | 2014-10-16 | Chisel hammer |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3009237A1 true EP3009237A1 (en) | 2016-04-20 |
Family
ID=51703090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14189201.8A Withdrawn EP3009237A1 (en) | 2014-10-16 | 2014-10-16 | Chisel hammer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3009237A1 (en) |
WO (1) | WO2016059032A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10814468B2 (en) | 2017-10-20 | 2020-10-27 | Milwaukee Electric Tool Corporation | Percussion tool |
WO2019147919A1 (en) | 2018-01-26 | 2019-08-01 | Milwaukee Electric Tool Corporation | Percussion tool |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB209354A (en) * | 1923-04-24 | 1924-01-10 | Det Tekniske Forsogsaktieselsk | Improvements in percussive tools |
US1657387A (en) * | 1925-06-17 | 1928-01-24 | Goldschmidt Rudolf | Mechanical hammer |
US3177386A (en) * | 1961-11-14 | 1965-04-06 | Macchioni Pietro Aurelio | Alternating-current electromagnetic reciprocating motor |
US3583498A (en) * | 1970-02-13 | 1971-06-08 | Ceg Corp | Impact hammer |
EP1048415A2 (en) * | 1999-04-30 | 2000-11-02 | Black & Decker Inc. | Rotary hammer |
-
2014
- 2014-10-16 EP EP14189201.8A patent/EP3009237A1/en not_active Withdrawn
-
2015
- 2015-10-13 WO PCT/EP2015/073640 patent/WO2016059032A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB209354A (en) * | 1923-04-24 | 1924-01-10 | Det Tekniske Forsogsaktieselsk | Improvements in percussive tools |
US1657387A (en) * | 1925-06-17 | 1928-01-24 | Goldschmidt Rudolf | Mechanical hammer |
US3177386A (en) * | 1961-11-14 | 1965-04-06 | Macchioni Pietro Aurelio | Alternating-current electromagnetic reciprocating motor |
US3583498A (en) * | 1970-02-13 | 1971-06-08 | Ceg Corp | Impact hammer |
EP1048415A2 (en) * | 1999-04-30 | 2000-11-02 | Black & Decker Inc. | Rotary hammer |
Also Published As
Publication number | Publication date |
---|---|
WO2016059032A1 (en) | 2016-04-21 |
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Effective date: 20161021 |