EP0218547A2 - Marteau pour forer ou buriner - Google Patents

Marteau pour forer ou buriner Download PDF

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Publication number
EP0218547A2
EP0218547A2 EP86810384A EP86810384A EP0218547A2 EP 0218547 A2 EP0218547 A2 EP 0218547A2 EP 86810384 A EP86810384 A EP 86810384A EP 86810384 A EP86810384 A EP 86810384A EP 0218547 A2 EP0218547 A2 EP 0218547A2
Authority
EP
European Patent Office
Prior art keywords
striker
shoulder
guide body
drilling
percussion piston
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.)
Granted
Application number
EP86810384A
Other languages
German (de)
English (en)
Other versions
EP0218547A3 (en
EP0218547B1 (fr
Inventor
Peter Brix
Peter Gloor
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6280154&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0218547(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP0218547A2 publication Critical patent/EP0218547A2/fr
Publication of EP0218547A3 publication Critical patent/EP0218547A3/de
Application granted granted Critical
Publication of EP0218547B1 publication Critical patent/EP0218547B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • 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
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • 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
    • B25D2250/191—Ram catchers for stopping the ram when entering idling mode

Definitions

  • the invention relates to a hammer drill and chisel hammer with percussion mechanism, which has a percussion piston set in a reciprocating motion by a motor-driven excitation piston, which delivers its impact energy to a tool via an axially displaceable striker, the displacement path in drilling or Chisel direction is limited by running up an overrun shoulder of the striker on a stop of a housing-side guide body.
  • a striking piston of a striking mechanism which is pneumatically moved in a reciprocating motion, strikes a striking die, which the latter conveys to a tool which is displaceably guided in a tool holder for work performance.
  • the tool is held in the working position by the contact pressure applied by the operator, the tool also holding the striker in the working position. In this working position, the rear end of the striker protrudes slightly into the path of the reciprocating percussion piston.
  • the device is withdrawn or, for example, the tool does not find sufficient axial resistance on the material to be processed during the drilling process due to changing strength of the material to be processed or the passage of the borehole, the tool in the tool holder moves in the drilling or chiseling direction out of the effective area of the striker .
  • the striker can subsequently move against the stop of the guide body on the drilling and chiseling direction side with a ramp shoulder.
  • the impact piston which is still driven, then runs on the striker, which is now axially supported via the stop, with a hard impact.
  • the invention has for its object to provide a hammer drill and chisel hammer, in which a lookup of the percussion piston in the empty stroke situation is reliably prevented.
  • the object is achieved in that a spring element is arranged between the guide body and the striker, which keeps the run-up shoulder of the striker at a distance from the stop of the guide body by the amount of the spring travel against the drilling or chiseling direction.
  • the striker When the tool is moved out of the effective area of the striker, the striker is held by the spring element against the possible shoulder on the device with the overrun shoulder at a distance from the stop of the guide body. If the percussion piston hits the striker, the mediated impact energy causes an impulsive shift of the striker in the drilling or chiseling direction, whereupon the striker hits the shoulder of the guide body with the overrun shoulder.
  • the impact energy of the percussion piston is therefore divided into two impact processes, namely an impact of the percussion piston on the striker and a subsequent impact of the striker on the stop of the guide body. This subdivision of the impact energy results in a dampened interception of the percussion piston, with neither device damage nor significant rebound forces occurring.
  • the percussion piston therefore remains in its empty stroke position. The percussion piston can be held in this position by locking elements.
  • the spring element is tensioned when the anvil is shifted in the drilling or chiseling direction.
  • the tension of the spring element immediately after the striking of the striker at the stop causes the striker to be moved back into the spaced position from the stop.
  • the spring element is preferably supported on a support shoulder of the guide body and on a support shoulder of the striker.
  • the guide body is, for example, a sleeve-shaped part with a central bore, which serves to guide the striker.
  • the support shoulders on the guide body and on the striking block, on which the spring element is supported against the drilling and chiseling direction for the purpose of delivering compressive forces for displacing the striking block, are easy to produce and are distinguished by trouble-free function.
  • the support shoulder of the guide body is advantageously formed by the shoulder of a graduated diameter of the guide body.
  • the diameter gradation relates to the central bore passing through the guide body.
  • the diameter gradation is expediently dimensioned so large that an annular shoulder forming the stop of the guide body remains on the annular support shoulder closer to the center.
  • the spring element can be supported directly or, for example, with the interposition of a spacer designed as a ring.
  • the support shoulder of the guide body is formed by balls projecting radially into the path of movement of the striker. At least two balls are expediently arranged at a uniform angular distance from one another. Thanks to the round surface of the balls, these ensure a particularly gentle interaction with the spring element.
  • the support shoulder of the striker is formed by an end face having the ramp shoulder.
  • the support shoulder runs around the center of the overrun shoulder.
  • the support shoulder of the guide body is sunk relative to the plane of a stop of the guide body designed as an annular shoulder. This ensures that the spring element is not overstretched when the striker is moved in the drilling or chiseling direction.
  • the support shoulder of the striker is formed by the shoulder of a diameter gradation of the striker.
  • the diameter gradation can be the side wall of a groove encircling the die.
  • the anvil in the drill or chisel direction end region can be provided with a pin-shaped extension of smaller cross-section. The radial transition between the extension and the adjoining, larger cross-sectional area of the anvil forms the support shoulder for the spring element.
  • the spring element is advantageously designed as a rubber-elastic ring.
  • a rubber-elastic ring is an inexpensive series part with a long service life.
  • FIG. 1 shows a substantially sleeve-shaped guide body 1 on the housing side with a central bore 2.
  • a hollow cylinder 3 in which a percussion piston 4 of a percussion mechanism is mounted for exercising reciprocating movement, projects into the central bore 2 in the direction of drilling.
  • a striker 5 is also arranged displaceably in the central bore 2 in order to act on an insertion end of a tool 6 which projects into the central bore 2 against the drilling or chiseling direction.
  • the percussion piston 4 has a tapered pin 7 pointing in the drilling or chiseling direction, which is provided with a circumferential groove 8.
  • an elastic locking ring 9 projects radially into the central bore 2.
  • two diametrically opposite balls 11 project into the central bore 2 in the movement range of the striker 5.
  • the striker 5 has a head 12 with a sealing ring 13 and one counter to the drilling direction molded shaft 14 of smaller cross section.
  • a spring element in the form of a rubber-elastic ring 16 is inserted into an annular groove 15, which protrudes beyond the outer contour of the shaft 14.
  • the tool 6 is pushed into the central bore 2 against the drilling or chiseling direction by the contact pressure of the device applied by the operator.
  • the tool 6 is on the end face 17 of the striker 5 and moves it against the direction of drilling with the transition shoulder between the head 12 and shaft 14 against the balls 11 in the working position.
  • the reciprocating percussion piston 4 successively imparts blows to the striker 5, which it forwards them to the tool 6 which is supported on the workpiece.
  • the tool 6 comes out of the effective range of the reciprocating striker 5.
  • the striker 5 consequently shifts from the working position in the direction of drilling or chiseling, the protruding one Ring 16 runs on the balls 11 and thus stops the striker 5 in the drilling or chiseling direction (FIG. 2).
  • the balls 11 and the wall of the annular groove 15 lying opposite the drilling or chiseling direction form support shoulders for the ring 16. In this axial position of the striker 5, a part of the end face 17 serving as an overrun shoulder 18 is at a distance from a stop 19 of the annular shoulder Guide body 1.
  • the percussion piston 4 then hits the striker 5 in front of the working position, the locking ring 9 being penetrated by the pin 7 and falling into the recess 8, as can be seen in FIG. 3.
  • the kinetic energy of the striking piston 4 running on the striker 5 causes the striker 5 to accelerate in the drilling or chiseling direction, whereupon the striker 5 runs up against the stop 19 at the stop 19.
  • the elastic ring 16 is deformed by the balls 11, ie there is a biasing force acting on the striker 5 against the drilling or chiseling direction.
  • the percussion piston 4 consequently remains in the end position shown in FIG. 3, in which the pneumatic connection between the percussion piston 4 and an excitation piston is interrupted. In spite of the exciter piston still being driven by the motor, there is therefore no further striking of the percussion piston 4.
  • the tensioned elastic ring 16 drives the striker 5 at a distance from the stop 19, as shown in FIG. 2.
  • a guide body 21 with a central bore 22 is shown.
  • An anvil 23 is slidably mounted in the central bore 22. This in turn essentially consists of a head 24 with a sealing ring 25 and a tapered shaft 26 pointing counter to the drilling or chiseling direction.
  • the striker 23 acts with a percussion piston and a tool.
  • the end face 27 of the striker 23 pointing in the drilling or chiseling direction serves in some areas as a run-up shoulder 28 which can be caught on a stop 29 of the guide body 21 designed as an annular shoulder.
  • the outer region of the end face 27 acts as a support shoulder 31 for an elastic ring 32, which rests against a further support shoulder 33 in the guide body 21 in the drilling or chiseling direction.
  • the support shoulder 33 is part of a diameter gradation of the central bore 22 and is formed by the bottom of an annular groove, the depth of which is smaller than the diameter of the cross section of the ring 32.
  • the percussion piston can act on the striker 23 in the distance position shown when the tool is located out of the effective range of the striker 23, with the aforementioned acceleration and interception of the striker 23 under pretension of the ring 32.
  • the arrangement according to FIG. 5 also consists of a guide body 41, which is indicated in the drawing, with a central bore 42, in which a striker 43 is displaceably mounted.
  • the striking block 43 consists of a head 44, a shaft 45 of smaller diameter protruding counter to the drilling or chiseling direction and a pin-shaped extension 46 adjoining the head 44 in the drilling or chiseling direction and having a smaller diameter than the head 44.
  • the end face 47 of the extension 46 forms an overrun shoulder 48 in some areas, which cooperates with a stop 49 of the guide body 41 designed as an annular shoulder.
  • a support shoulder 51 is formed by part of a diameter gradation of the central bore 42 in the guide body 41.
  • the ring surface 53 of which points counter to the drilling or chiseling direction serves as a run-up surface for an elastic ring 54 which is pre-tensioned on the extension 46.
  • the ring 54 lies sealingly against the wall of the central bore 42. Contrary to the drilling or chiseling direction, the ring 54 is supported on a support shoulder 55 of the striker 43, which is formed by the diameter gradation between the extension 46 and the head 44.
  • the striker 43 interacts with a percussion piston and a tool.
  • the striking block 43 is accelerated in the drilling or chiseling direction, the run-up shoulder 48 running against the stop 49 at the end of the acceleration process.
  • the ring 54 is prestressed in order to bring the striker 43 back into the axial position shown in FIG. 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP86810384A 1985-09-05 1986-08-27 Marteau pour forer ou buriner Expired - Lifetime EP0218547B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3531641 1985-09-05
DE19853531641 DE3531641A1 (de) 1985-09-05 1985-09-05 Bohr- und meisselhammer

Publications (3)

Publication Number Publication Date
EP0218547A2 true EP0218547A2 (fr) 1987-04-15
EP0218547A3 EP0218547A3 (en) 1987-04-29
EP0218547B1 EP0218547B1 (fr) 1990-06-06

Family

ID=6280154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810384A Expired - Lifetime EP0218547B1 (fr) 1985-09-05 1986-08-27 Marteau pour forer ou buriner

Country Status (2)

Country Link
EP (1) EP0218547B1 (fr)
DE (2) DE3531641A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5871059A (en) * 1995-02-28 1999-02-16 Makita Corporation Mechanism for preventing idling strikes in power-driven striking tools
EP2105260A1 (fr) * 2008-03-28 2009-09-30 Makita Corporation Outil d'impact
EP2116333A1 (fr) * 2008-05-08 2009-11-11 AEG Electric Tools GmbH Perceuse à percussion
EP1815947A3 (fr) * 1999-04-30 2013-03-06 Black & Decker Inc. Marteau rotatif
CN107160327A (zh) * 2017-07-07 2017-09-15 广西玉柴机器股份有限公司 一种安装碗型塞及销钉的复合冲头
US12528170B2 (en) 2023-04-25 2026-01-20 Milwaukee Electric Tool Corporation Impact tool anvil with improved durability

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08235208A (ja) * 1995-02-28 1996-09-13 Toshiba Corp データ検索方法
EP2029326A1 (fr) * 2006-06-06 2009-03-04 Robert Bosch GmbH Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté
CN219027426U (zh) 2020-03-23 2023-05-16 米沃奇电动工具公司 旋转锤

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1825632A (en) * 1927-12-03 1931-09-29 Edo Aircraft Corp Percussive tool
US2372029A (en) * 1943-11-15 1945-03-20 Carlyle B Stair Pneumatic hammer
US3022838A (en) * 1959-02-05 1962-02-27 Thor Power Tool Co Portable hammer
US3266581A (en) * 1963-11-01 1966-08-16 Mechanical Res Corp Vibrationless power tool
CH636796A5 (en) * 1979-01-25 1983-06-30 Duss Friedrich Maschf Electropneumatic hammer with a catch ring for the percussion piston
GB2084917A (en) * 1980-10-08 1982-04-21 Kango Electric Hammers Ltd Improvements in or relating to percussive tools
FR2531138A1 (fr) * 1982-07-29 1984-02-03 Inst Avtomatiki Akademii Dispositif de percussion notamment pour machine hydraulique de forage de puits
DE3231902A1 (de) * 1982-08-27 1984-03-22 Robert Bosch Gmbh, 7000 Stuttgart Kraftangetriebene handwerkzeugmaschine fuer schlagende oder drehschlagende arbeitsweise
DE3335553C2 (de) * 1983-09-30 1994-02-24 Black & Decker Inc Bohrhammer mit Leerlauffangeinrichtung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5871059A (en) * 1995-02-28 1999-02-16 Makita Corporation Mechanism for preventing idling strikes in power-driven striking tools
EP1815947A3 (fr) * 1999-04-30 2013-03-06 Black & Decker Inc. Marteau rotatif
EP2105260A1 (fr) * 2008-03-28 2009-09-30 Makita Corporation Outil d'impact
US8037947B2 (en) 2008-03-28 2011-10-18 Makita Corporation Impact tool with shock absorbing element
EP2116333A1 (fr) * 2008-05-08 2009-11-11 AEG Electric Tools GmbH Perceuse à percussion
CN107160327A (zh) * 2017-07-07 2017-09-15 广西玉柴机器股份有限公司 一种安装碗型塞及销钉的复合冲头
US12528170B2 (en) 2023-04-25 2026-01-20 Milwaukee Electric Tool Corporation Impact tool anvil with improved durability

Also Published As

Publication number Publication date
EP0218547A3 (en) 1987-04-29
EP0218547B1 (fr) 1990-06-06
DE3671713D1 (de) 1990-07-12
DE3531641A1 (de) 1987-03-05

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