EP0266305A1 - Marteau de forage avec mécanisme de percussion - Google Patents

Marteau de forage avec mécanisme de percussion Download PDF

Info

Publication number
EP0266305A1
EP0266305A1 EP87810528A EP87810528A EP0266305A1 EP 0266305 A1 EP0266305 A1 EP 0266305A1 EP 87810528 A EP87810528 A EP 87810528A EP 87810528 A EP87810528 A EP 87810528A EP 0266305 A1 EP0266305 A1 EP 0266305A1
Authority
EP
European Patent Office
Prior art keywords
tool
balls
ring
guide cylinder
flying 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
EP87810528A
Other languages
German (de)
English (en)
Other versions
EP0266305B1 (fr
Inventor
Anton Neumaier
Hans-Jürgen Hoereth
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
Publication of EP0266305A1 publication Critical patent/EP0266305A1/fr
Application granted granted Critical
Publication of EP0266305B1 publication Critical patent/EP0266305B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • 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
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms

Definitions

  • the invention relates to a hammer drill with percussion mechanism, in which a flying piston, which conveys a tool, is displaceably mounted in a guide cylinder between a position facing away from the tool and a position facing the tool, and spring-loaded balls which can be radially inserted into a recess on the flying piston by the spring force for holding the flying piston in a position facing the tool.
  • Known rotary hammers have a striking mechanism which is used to impart strikes to a clamped tool for performing work.
  • So-called pneumatic percussion mechanisms have proven to be particularly advantageous which have a flying piston which is caused to move back and forth in a guide cylinder by overpressure or underpressure from a drive piston and thereby acts on the tool with each stroke directed towards the tool.
  • care is taken to ensure that the flying piston is brought to a standstill despite the drive piston continuing to run.
  • the flying piston can be moved further towards the tool beyond the working stroke movement provided for the application of the tool. If the flying piston carries out this further displacement movement, a circumferential recess of the flying piston comes into the effective range of balls which spring radially into the trajectory of the flying piston. The latter snap into the recess of the flying piston and hold it in the so-called empty position. To reactivate the flying piston, it is pushed out of the empty position directly or indirectly by the tool.
  • a spring-elastic O-ring acts radially on these to deflect them. Balls and O-ring are held in a guide ring adjacent to the guide cylinder. Significant disadvantages arise in particular from the high abrupt stress on the O-ring when the flying piston enters the effective area of the balls, which are disengaged at high speed. This leads to premature wear of the O-ring. In addition, the O-ring does not allow a radially compact design, since both the balls and the O-ring lying above them are sunk in the guide ring and a radial spring travel must also be taken into account. An O-ring also has a strongly progressive spring line and a wide spread of spring force.
  • the invention is based on the object of ensuring a high life expectancy of the spring means in a hammer drill with a flying piston which is held by balls in the empty position with balls being held uniformly, and at the same time enabling a simple and compact construction.
  • the object is achieved in that the balls are mounted displaceably in openings in the guide cylinder and are supported by a spring-loaded ring which can be moved along the guide cylinder.
  • the spring-loaded ring presses against each of the balls with the same spring force and thus snaps them evenly into the recess of the flying piston, which may be in the empty position.
  • the flying piston can be pushed out of the empty position while overcoming the spring force, the curvature of the balls, in cooperation with the contour of the ring lying against them, allowing the ring to be displaced against the spring force.
  • the balls can thus withdraw from the trajectory of the flying piston.
  • the ring can, for example, consist of largely wear-resistant metal.
  • the spring is not subject to any direct radial action from the balls and therefore guarantees a long life expectancy, especially since steel is the preferred material for the spring.
  • the contour of the ring serving to support the balls is designed as a conical surface.
  • the conical surface allows an optimal transfer of the axial spring force to the balls, in that higher radial forces act on the balls for locking purposes with a relatively small axial force while deflecting the force.
  • the conical surface also prevents any angular attack of the ring on the balls, which brings both functional and wear advantages.
  • the conical surface expediently widens in the direction facing the tool. This arrangement is particularly advantageous if a short overall length of the device is to be achieved.
  • a compression spring is supported on the ring which drives it in the direction facing the tool and applies the spring force for engaging the balls.
  • a compression spring is a cost-effective component with precisely maintainable force and has a long life expectancy in this application.
  • the compression spring expediently wraps around the guide cylinder and is supported axially on the one hand and on the shoulder of the ring facing away from the tool.
  • the drill hammer shown in FIG. 1 with its front area has a guide cylinder 1 and a guide sleeve 2 screwed to it.
  • the guide cylinder 1 is rotatably mounted in a device housing 4 via a roller bearing 3.
  • the bore of the guide cylinder 1 is enlarged in diameter compared to the front area and accommodates a flying piston 5 and a drive piston 6 of a pneumatic percussion mechanism which is known per se and which is driven by a motor.
  • an anvil 7 extending in the guide sleeve 2 is mounted displaceably ar. Blows transmitted from the flying piston 5 to the anvil 7 emits them to a tool 8 which is displaceably mounted in the guide sleeve 2.
  • the flying piston 5 has a sealing ring 9 on the rear and is provided on the front with a circumferential recess 11.
  • the balls 13 are indented by a ring 14, the inner contour of which has a conical surface 15 for supporting the balls 13.
  • a compression spring 16 which is shouldered on a support disk 17 of the guide cylinder 1, drives the ring 14 forward.
  • the balls 13, together with the ring 14 and the compression spring 16, thus form a catching device for the flying piston 5.
  • the flying piston 5 does not cover a ventilation opening 18 in the guide cylinder 1, so that further stroke movement of the drive piston 6 does not cause any Flight piston 5 causing pneumatic negative or positive pressure in the guide cylinder 1.
  • a sealing ring 19 engages around the striker 7 in the central longitudinal section for the sealing mounting of the striker.
  • These balls 22 are mounted in bores 23 of the guide cylinder 1 and are held in engagement with the striker 7 by a retaining ring 24.
  • the guide cylinder 1 is penetrated by two diametrically opposed opening 25, in which roller-shaped locking bodies 26 are axially and radially displaceable.
  • the locking bodies 26 serve to hold the tool 8 in a rotationally locking and axially displaceable manner and for this purpose are radially indented in driving recesses 27 of the tool.
  • An engagement element in the form of an adjusting sleeve 28 serves to engage the locking bodies 26. It is slidably seated concentrically on the guide sleeve 2 and is urged forward by a compression spring 29. 1 shows the tool 8 inserted into the guide sleeve 2 in the locking position and the adjusting sleeve 28 in the release position, into which it is withdrawn against the force of the compression spring 29. In the release position of the adjusting sleeve 28, the locking bodies 26 face pocket-shaped recesses 31 in the adjusting sleeve 28, so that the locking bodies 26 can be moved radially freely for inserting or removing the tool 8.
  • the adjusting sleeve 28 is pushed forward by the compression spring 29 from the release position shown in FIG. 1 into the locking position shown in FIG. 2, the adjusting sleeve 28 running against a stop ring 32 of the guide sleeve 2.
  • the inner contour 33 of the adjusting sleeve 28 lying behind the recesses 31 presses the locking bodies 26 into the driving recesses 27 on the tool side.
  • the tool 8 In the locked position, the tool 8 is pressed against a work piece to perform the work, as a result of which the tool 8 moves the striker 7 backwards against the flying piston 5.
  • the flying piston 5 moves by disengaging the balls 13 against the force of the compression spring 16 from the holding engagement of the balls 13 into the impact-effective working position which can be seen in FIG. 2.
  • the flying piston 5 covers the ventilation opening 18, as a result of which alternating negative and positive pressure is created in the guide cylinder 1 between the flying piston 5 and the driving piston 6, which leads to the lifting movement of the flying piston 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP87810528A 1986-10-03 1987-09-15 Marteau de forage avec mécanisme de percussion Expired - Lifetime EP0266305B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3633675 1986-10-03
DE19863633675 DE3633675A1 (de) 1986-10-03 1986-10-03 Bohrhammer mit schlagwerk

Publications (2)

Publication Number Publication Date
EP0266305A1 true EP0266305A1 (fr) 1988-05-04
EP0266305B1 EP0266305B1 (fr) 1991-10-23

Family

ID=6310964

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810528A Expired - Lifetime EP0266305B1 (fr) 1986-10-03 1987-09-15 Marteau de forage avec mécanisme de percussion

Country Status (4)

Country Link
US (1) US4798249A (fr)
EP (1) EP0266305B1 (fr)
JP (1) JPS6393578A (fr)
DE (2) DE3633675A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2458523A (en) * 2008-03-18 2009-09-23 Bosch Gmbh Robert Portable machine tool with device for holding striker in idling position
US7797640B2 (en) 2005-09-29 2010-09-14 Robert Bosch Gmbh Method for generating a flexible display field for a video surveillance system

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447205A (en) * 1993-12-27 1995-09-05 Ryobi Motor Products Drill adjustment mechanism for a hammer drill
DE102006000395A1 (de) * 2006-08-07 2008-02-14 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
DE102007000081A1 (de) * 2007-02-08 2008-08-21 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
US9592600B2 (en) 2011-02-23 2017-03-14 Ingersoll-Rand Company Angle impact tools
US8925646B2 (en) 2011-02-23 2015-01-06 Ingersoll-Rand Company Right angle impact tool
SE1150383A1 (sv) 2011-05-03 2012-07-24 Atlas Copco Rock Drills Ab En slagöverföringsdel, och en borrmaskin innefattande en sådan slagöverföringsdel
US9022888B2 (en) 2013-03-12 2015-05-05 Ingersoll-Rand Company Angle impact tool
EP3181300A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3789162A1 (fr) * 2019-09-04 2021-03-10 Hilti Aktiengesellschaft Entraînement rotatif pour une machine-outil mainuelle
EP3822037A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Agencement de mécanisme de percussion
EP3822030A1 (fr) * 2019-11-15 2021-05-19 Hilti Aktiengesellschaft Marteau perforateur et/ou burin avec agencement de mécanisme de percussion
WO2021194737A1 (fr) 2020-03-23 2021-09-30 Milwaukee Electric Tool Corporation Perceuse à percussion

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290256A (en) * 1940-11-04 1942-07-21 Eugene H Souter Pneumatic tool
FR987499A (fr) * 1943-02-26 1951-08-14 Outil frappeur automatique
DE2242944B2 (de) * 1972-08-31 1981-04-23 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE2252951B2 (de) * 1972-10-28 1981-09-10 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE8027989U1 (de) * 1980-10-21 1982-04-01 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE2806611C2 (de) * 1978-02-16 1983-10-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum Umschalten eines elektropneumatischen Bohrhammers von Drehbohren auf Schlagbohren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2165066B2 (de) * 1971-12-28 1976-12-02 Impex-Essen Vertrieb Von Werkzeugen Gmbh, 8800 Ansbach Drehschlagbohrmaschine
DE2820128A1 (de) * 1978-05-09 1979-11-22 Bosch Gmbh Robert Handwerkzeugmaschine
US4442906A (en) * 1980-11-18 1984-04-17 Black & Decker Inc. Percussive drills

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290256A (en) * 1940-11-04 1942-07-21 Eugene H Souter Pneumatic tool
FR987499A (fr) * 1943-02-26 1951-08-14 Outil frappeur automatique
DE2242944B2 (de) * 1972-08-31 1981-04-23 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE2252951B2 (de) * 1972-10-28 1981-09-10 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer
DE2806611C2 (de) * 1978-02-16 1983-10-27 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Vorrichtung zum Umschalten eines elektropneumatischen Bohrhammers von Drehbohren auf Schlagbohren
DE8027989U1 (de) * 1980-10-21 1982-04-01 Robert Bosch Gmbh, 7000 Stuttgart Bohrhammer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7797640B2 (en) 2005-09-29 2010-09-14 Robert Bosch Gmbh Method for generating a flexible display field for a video surveillance system
GB2458523A (en) * 2008-03-18 2009-09-23 Bosch Gmbh Robert Portable machine tool with device for holding striker in idling position
GB2458523B (en) * 2008-03-18 2012-06-06 Bosch Gmbh Robert Portable machine tool,in particular rotary or percussion hammer, having a striker-catching device and/or striker-damping device

Also Published As

Publication number Publication date
JPS6393578A (ja) 1988-04-23
EP0266305B1 (fr) 1991-10-23
DE3774072D1 (de) 1991-11-28
US4798249A (en) 1989-01-17
DE3633675A1 (de) 1988-04-14

Similar Documents

Publication Publication Date Title
DE2354168C2 (de) Werkzeughalter für einen Bohrhammer
EP1716979B1 (fr) Marteau perforateur ou marteau-burineur
EP0266305B1 (fr) Marteau de forage avec mécanisme de percussion
EP1326736B1 (fr) Porte-outil pour une machine-outil
DE2323268C3 (de) Schlagbohrmaschine
DE19815650B4 (de) Drehbohrhammer
DE2540838C2 (de) Elektropneumatischer Hammer
EP0876881B1 (fr) Appareil de forage et/ou percussion
DE3828309C3 (de) Bohrhammer
EP0589337A1 (fr) Machine outil à main, notamment marteau perforateur
DE2729596A1 (de) Bohrhammer mit pneumatisch angetriebenem schlagkolben
CH646899A5 (de) Bohrhammer.
DE2726214A1 (de) Bohrhammer mit pneumatisch angetriebenem schlagkolben
EP1795308A2 (fr) Appareil à percussion
CH627231A5 (en) Tool holder
EP1417076A1 (fr) Machine-outil manuelle
DE69918532T2 (de) Schlagbohrmaschine
CH666650A5 (de) Halterung an bohrhaemmern oder schlagbohrmaschinen.
DE3623648A1 (de) Bohrhammer mit schlagwerk
EP0375917A1 (fr) Perceuse
DE4317273A1 (de) Werkzeugaufnahme für Handbohr- und Schlaggeräte mit SDS-Zusatznut
EP0489687B1 (fr) Outil pour forer et ciseler
DE3335305C1 (de) Handgefuehrte Hammerbohrmaschine
DE3526996C2 (de) Bohr- und Meisselhammer mit Entlüftung
CH619027A5 (en) Drilling appliance with an interchangeable rock drill, in particular a percussion drill, a hammer drill and the like

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB LI NL SE

17P Request for examination filed

Effective date: 19880520

17Q First examination report despatched

Effective date: 19900316

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB LI NL SE

REF Corresponds to:

Ref document number: 3774072

Country of ref document: DE

Date of ref document: 19911128

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920930

Year of fee payment: 6

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930617

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930903

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19940401

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19940826

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940915

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940916

EAL Se: european patent in force in sweden

Ref document number: 87810528.7

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940915

EUG Se: european patent has lapsed

Ref document number: 87810528.7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19950622

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19950930

Ref country code: CH

Effective date: 19950930

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960930

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990728

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010601