EP3009237A1 - Marteau-burineur - Google Patents

Marteau-burineur Download PDF

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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Withdrawn
Application number
EP14189201.8A
Other languages
German (de)
English (en)
Inventor
Oliver Ohlendorf
Josef Fünfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP14189201.8A priority Critical patent/EP3009237A1/fr
Priority to PCT/EP2015/073640 priority patent/WO2016059032A1/fr
Publication of EP3009237A1 publication Critical patent/EP3009237A1/fr
Withdrawn legal-status Critical Current

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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)
EP14189201.8A 2014-10-16 2014-10-16 Marteau-burineur Withdrawn EP3009237A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP14189201.8A EP3009237A1 (fr) 2014-10-16 2014-10-16 Marteau-burineur
PCT/EP2015/073640 WO2016059032A1 (fr) 2014-10-16 2015-10-13 Marteau-burineur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14189201.8A EP3009237A1 (fr) 2014-10-16 2014-10-16 Marteau-burineur

Publications (1)

Publication Number Publication Date
EP3009237A1 true EP3009237A1 (fr) 2016-04-20

Family

ID=51703090

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14189201.8A Withdrawn EP3009237A1 (fr) 2014-10-16 2014-10-16 Marteau-burineur

Country Status (2)

Country Link
EP (1) EP3009237A1 (fr)
WO (1) WO2016059032A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
CN214723936U (zh) 2018-01-26 2021-11-16 米沃奇电动工具公司 冲击工具

Citations (5)

* Cited by examiner, † Cited by third party
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 (fr) * 1999-04-30 2000-11-02 Black & Decker Inc. Marteau rotatif

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 (fr) * 1999-04-30 2000-11-02 Black & Decker Inc. Marteau rotatif

Also Published As

Publication number Publication date
WO2016059032A1 (fr) 2016-04-21

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