EP0218547B1 - Marteau pour forer ou buriner - Google Patents

Marteau pour forer ou buriner Download PDF

Info

Publication number
EP0218547B1
EP0218547B1 EP86810384A EP86810384A EP0218547B1 EP 0218547 B1 EP0218547 B1 EP 0218547B1 EP 86810384 A EP86810384 A EP 86810384A EP 86810384 A EP86810384 A EP 86810384A EP 0218547 B1 EP0218547 B1 EP 0218547B1
Authority
EP
European Patent Office
Prior art keywords
drilling
shoulder
guide body
striker
anvil
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.)
Revoked
Application number
EP86810384A
Other languages
German (de)
English (en)
Other versions
EP0218547A3 (en
EP0218547A2 (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(B1) "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
Revoked 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 striking mechanism, which has a percussion piston set in a reciprocating motion by a motor-driven exciter 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 this imparts to a tool for work performance which is displaceably guided in a tool holder.
  • 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.
  • a hammer drill with a striking mechanism having a percussion piston and a striker for transmitting the blows to a tool is known.
  • a catch ring arranged on the percussion piston snaps into an annular groove of a sleeve element encompassing the striker and the percussion piston strikes the end face of the sleeve element which is supported on a rubber-elastic ring.
  • the rubber-elastic ring which is thus highly stressed and therefore susceptible to wear, drives the sleeve element and the percussion piston against the drilling direction due to the relaxation force, which means that the percussion piston can be released when the sleeve element is stopped, which leads to a lookup.
  • the invention has for its object to provide a hammer and chisel hammer with percussion piston and striker, the displacement of which in the drilling or chiseling direction is limited by sling means, in which the impact piston in the empty position is reliably prevented from looking up.
  • the object is achieved in that a spring element, which is supported on a support shoulder of the guide body and on a support shoulder of the striker and is designed as a rubber-elastic ring, is arranged between the guide body and the striker, and the run-up shoulder of the striker by the amount of the spring travel against the drilling or chiseling direction keeps at a distance from the stop of the guide body, the support shoulder of the guide body projecting radially into the path of movement of the striker.
  • 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.
  • 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 anvil, on which the spring element for the purpose of delivering Supports compressive forces to move the striker against the drilling and chiseling direction, are easy to produce and are characterized 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 overstressed 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 striker with a pin-shaped extension of smaller cross-section in the end region pointing in the direction of drilling or chiseling. The radial transition between the extension and the adjoining, larger cross-sectional area of the anvil forms the support shoulder for the spring element.
  • Fig. 1 shows a housing-side, substantially sleeve-shaped guide body 1 with a central bore 2.
  • a hollow cylinder 3 protrudes into the central bore 2, in which a percussion piston 4 of a striking mechanism is mounted for exercising reciprocating movement.
  • 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 drilling or chiseling direction, the overhanging 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 strikes 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 thereby of the balls 11 deformed, that is, a biasing force acts 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 continuing to operate by motor, there is therefore no further striking of the percussion piston 4.
  • the tensioned elastic ring 16 drives the striker 5 in a spaced position 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 interacts 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 with 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 against 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)

Claims (5)

1. Marteau perforateur-burineur muni d'un mécanisme de percussion caractérisé par un mouvement de va-et-vient transmis par un piston excitateur, actionné par moteur, à un piston- frappeur (4), lequel transmet son énergie de percussion à un outil (6) par l'intermédiaire d'une broche (5, 23, 43) dont la course est limitée axialement par une butée, auquel cas le déplacement de cet outil dans la direction de forage et/ou de burinage est limité au contact d'un épaulement d'arrêt (18, 28, 48) de la broche intermédiaire (5, 23, 43) contre la butée (19, 29, 49) d'un corps de guidage (1, 21, 41) situé du côté du boîtier, caractérisé par le fait qu'un élément élastique, constitué par un joint torique en caoutchouc souple (16, 32, 54) et s'appuyant sur une collerette d'appui (11,33,51) du corps de guidage (1, 21,41) et sur une collerette d'appui (15, 31, 55) de la broche intermédiaire (5, 23, 43), est disposé entre le corps de guidage (1, 21, 41) et la broche intermédiaire (5, 23, 43), de sorte que cet élément élastique maintienne l'épaulement d'arrêt (18, 28, 48) de la broche intermédiaire (5, 23, 43) en position écartée par rapport à la butée (19, 29, 49) du corps de guidage (1, 21, 41) de la dimension correspondant à la course d'amortissement dirigée en sens inverse de la direction de forage et/ou de burinage, auquel cas la collerette d'appui (11, 33, 51) du corps de guidage (1, 21, 41) s'élève radialement dans la trajectoire de déplacement de la broche intermédiaire (5, 23, 43).
2. Marteau perforateur-burineur selon revendication 1, caractérisé par le fait que la collerette d'appui (33, 51) du corps de guidage (21, 41) est constituée par l'épaulement d'un pas diamétral du corps de guidage (21, 41).
3. Marteau perforateur-burineur selon revendication 1, caractérisé par le fait que la collerette d'appui du corps de guidage (1) est constituée par des billes (11).
4. Marteau perforateur-burineur selon revendication 1 ou 2, caractérisé par le fait que la collerette d'appui (31) de la broche intermédiaire (23) est constituée par une face d'about (27) présentant l'épaulement d'arrêt (28).
5. Marteau perforateur-burineur selon l'une des revendications 1, 2 ou 3, caractérisé par le fait que la collerette d'appui (15, 55) de la broche intermédiaire (5, 43) est constituée par l'épaulement d'un pas diamétral de cette broche intermédiaire (5, 43).
EP86810384A 1985-09-05 1986-08-27 Marteau pour forer ou buriner Revoked 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 EP0218547A2 (fr) 1987-04-15
EP0218547A3 EP0218547A3 (en) 1987-04-29
EP0218547B1 true EP0218547B1 (fr) 1990-06-06

Family

ID=6280154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86810384A Revoked 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007141080A1 (fr) * 2006-06-06 2007-12-13 Robert Bosch Gmbh Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté
US12005555B2 (en) 2020-03-23 2024-06-11 Milwaukee Electric Tool Corporation Rotary hammer

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3424870B2 (ja) * 1995-02-28 2003-07-07 株式会社マキタ 打撃工具の空打ち防止装置
JPH08235208A (ja) * 1995-02-28 1996-09-13 Toshiba Corp データ検索方法
GB9909987D0 (en) * 1999-04-30 1999-06-30 Black & Decker Inc Rotary hammer
JP5154995B2 (ja) * 2008-03-28 2013-02-27 株式会社マキタ 打撃工具
DE102008022454B4 (de) * 2008-05-08 2014-06-26 Aeg Electric Tools Gmbh Bohrhammer
CN107160327B (zh) * 2017-07-07 2023-04-28 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

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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007141080A1 (fr) * 2006-06-06 2007-12-13 Robert Bosch Gmbh Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté
US12005555B2 (en) 2020-03-23 2024-06-11 Milwaukee Electric Tool Corporation Rotary hammer

Also Published As

Publication number Publication date
EP0218547A3 (en) 1987-04-29
DE3671713D1 (de) 1990-07-12
EP0218547A2 (fr) 1987-04-15
DE3531641A1 (de) 1987-03-05

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