EP1632313A1 - Outil de serrage avec mécanisme d'impact axial - Google Patents

Outil de serrage avec mécanisme d'impact axial Download PDF

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Publication number
EP1632313A1
EP1632313A1 EP05108160A EP05108160A EP1632313A1 EP 1632313 A1 EP1632313 A1 EP 1632313A1 EP 05108160 A EP05108160 A EP 05108160A EP 05108160 A EP05108160 A EP 05108160A EP 1632313 A1 EP1632313 A1 EP 1632313A1
Authority
EP
European Patent Office
Prior art keywords
spindle
screwdriver
hollow spindle
coupling
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.)
Granted
Application number
EP05108160A
Other languages
German (de)
English (en)
Other versions
EP1632313B1 (fr
Inventor
Thomas Hofbrucker
Thomas Bader
Markus Looser
Horst Rahmsdorf
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 EP1632313A1 publication Critical patent/EP1632313A1/fr
Application granted granted Critical
Publication of EP1632313B1 publication Critical patent/EP1632313B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
    • B25B21/023—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket for imparting an axial impact, e.g. for self-tapping screws

Definitions

  • the invention relates to a screwdriver with a housing and a hollow spindle which is rotatably mounted in the housing and driven by a, in particular electric, motor.
  • the screwdriver has a coupling which rotatably couples the hollow spindle in an engaged position with the motor, rotatably decoupled from the motor in a disconnected position and which is biased by a clutch spring into the disconnected position.
  • a driving spindle is axially displaceable relative to the hollow spindle and rotatably mounted, wherein the driving spindle with a tool holder for attaching a tool rotationally coupled and the clutch by pressure on the drive spindle against the clutch spring in the engaged position can be brought.
  • the screwing device has a striking mechanism, by means of which the driving spindle can be acted upon by a pulse-like axial force.
  • the screwdriver can be impulsively displaced in the direction of insertion when screwing through the axial-striking mechanism.
  • a drywall screw when attaching soft material elements, such as plasterboard, are screwed to a metal frame after drilling through the soft material without stronger pressing the screwdriver into the hard metal frame.
  • the axial forces generated by the Axialschlagmechanismus extend as far as possible pressing forces to screw the screw into the metal.
  • a screwing device with an Axialschlagmechanismus for generating pulse-like axial forces on a driving spindle is known.
  • the driving spindle is held by spherical locking elements limited axially displaceable on the hollow spindle.
  • the spherical locking elements are rotatably mounted in radial receiving bores of the hollow spindle and project permanently into axially aligned grooves on the surface of the driving spindle.
  • the drive-in spindle To transmit the rotational movement, the drive-in spindle must be moved against the housing by pressing the screwdriver against the workpiece to be screwed against the screwing-in direction.
  • the hollow spindle is also displaced by the insertion spindle until a coupling part mounted on the hollow spindle engages with a housing-mounted coupling part.
  • the present invention has for its object to avoid in a screwdriver with Axialschlagmechanismus said disadvantages and to extend the lifetime with good handling.
  • the object is achieved in that the coupling can be locked in the engaged position.
  • This makes it possible to keep the clutch largely independent of the position of the screw drive in engagement.
  • a torque can be transmitted from the drive via the coupling and the hollow spindle on the driving spindle and the tool holder even with a disengaged in the screw-driving drive.
  • a separation of the clutch due to the axial displacement of the screw drive by the Axialschlagmechanismus is avoided, which in turn reduces the wear of the clutch.
  • a locking mechanism is provided for locking the clutch, which is actuated as a function of the position of the insertion spindle relative to the hollow spindle.
  • the locking mechanism can be automatically activated and deactivated in a simple manner.
  • the coupling has a movable coupling part which can be fixed in the engaged position by means of the locking mechanism on the housing.
  • the clutch can be kept particularly stable in the engaged position, whereby an unintentional adjustment is avoided in the disconnected position.
  • the drive-in spindle can be fixed in the disconnected position by means of the locking mechanism in the axial direction on the hollow spindle.
  • the driving spindle is fixed in the disconnected position of the coupling via the hollow spindle and the spring force of the coupling spring in the axial direction relative to the housing. In this way, attachment or detachment of a tool on the tool holder is substantially simplified, since the screw-in spindle can no longer move freely freely.
  • the locking mechanism has at least one locking body which is displaceable in a radial transverse bore of the hollow spindle between an engagement position in which it partially projects into a longitudinal bore of the hollow spindle, and a disengagement position in which it is positioned outside the longitudinal bore.
  • the screw drive has a recess whose axial extent is matched to the engageable in the longitudinal bore part of the locking body.
  • the drive-in spindle can be fixed in the axial direction substantially free of play relative to the hollow spindle.
  • the recess is formed by an annular groove, whereby the manufacturing cost can be reduced.
  • the movable coupling part is firmly connected to the hollow spindle.
  • an axial stop is formed on the housing, to which the locking body in the release position in the axial direction can be applied.
  • the locking body is spherical, to allow by avoiding tilting a smooth change between the engagement and disengagement of the locking body.
  • the axial stop is formed by a guide sleeve having formed thereon, circumferential shoulder. This allows the axial stop separately from the housing especially hard material to extend the life of the screwdriver.
  • Fig. 1 shows the working side part of an electrically operated, hand-held screwdriver 2, which has a housing 4.
  • a driving spindle 6 is slidably mounted along its axis A but rotatably mounted in a hollow spindle 8.
  • a tool holder 10 is attached in the form of a bit holder, which serves for releasably receiving a tool 12, in particular in the form of screwdriver bits.
  • the screwdriving device 2 has an impact mechanism designated as a whole by 14. This consists essentially of one of a schematically illustrated control unit 16 actuated electromagnet 18 and a striking mass 20 which is pressed by a return spring 22 in an initial position in which most of the impact mass 20 is disposed outside of the electromagnet 18.
  • the impact mass 20 has a hardened insert 24, via which the drive-side end of the insertion spindle 6 can be acted upon by a pulse-like axial force.
  • a coil, not shown, of the electromagnet 18 is supplied by the control unit 16 for a predetermined period of time with a predetermined voltage.
  • the magnetizable impact mass 20 is accelerated against the force of the return spring 22 in the direction of the insertion spindle 6. In this way, blows can be generated on the drive-side end of the insertion spindle 6, which cause this pulse-like acting axial impacts.
  • the control unit 16 may be formed, for example, as a switch or sensor-controlled electronics.
  • the screwdriver 2 has an electric motor 26, which is rotationally coupled in a manner not shown with a drive wheel 28 in the form of a toothed belt pulley.
  • the drive wheel 28 is rotatably connected to a first coupling part 32 of a total of 30 designated coupling.
  • the first coupling part 32 is rotatably mounted on the hollow spindle 8.
  • a second coupling part 34 of the coupling 30 is freely rotatable and axially displaceable on the hollow spindle 8.
  • a third coupling part 36 is fixedly connected to the hollow spindle 8.
  • the first coupling part 32 and the second coupling part 34 are biased by a first clutch spring 40 into an illustrated disconnected position in which cam-shaped first engagement means 38 formed thereon are spaced from each other.
  • the second coupling part 34 and the third coupling part 36 are biased by a second clutch spring 44 in the release position in which cam-shaped second engagement means 42 formed thereon are spaced from each other.
  • the clutch 30 By moving the hollow spindle 8, the clutch 30 can be brought into an engaged position, in which the engagement means 38, 42 are engaged, as explained later.
  • a generally designated 46 locking mechanism which has two spherical locking body 48 which are held radially movable in opposite radial transverse bores 50 of the hollow spindle 8.
  • the locking body 48 protrude partially into a longitudinal bore 52 of the hollow spindle 8 and thereby engage in a matched to the shape of the locking body 48 groove-shaped recess 54 which is embedded in the surface of the screw 6.
  • the locking body 48 are located on an inner side of a guide sleeve 55 which is fixedly connected to the housing 4 and which is penetrated by the hollow spindle 8. By the guide sleeve 55, the locking body 48 are held radially immovable in the engagement position shown with respect to the longitudinal bore 52.
  • the insertion spindle 6 is fixed in the axial direction via the locking body 48 to the hollow spindle 8, which in turn via the clutch springs 40, 44 and the coupling parts 34, 36 is pressed in the position shown on the housing 4.
  • the tool 12 can be easily attached to the tool holder 10 or detached from it.
  • Fig. 2 shows the screwdriver 2 when screwing a fastener 56 in the form of a drywall screw for fixing a soft component 58 in the form of a plasterboard to a hard component 60 in the form of a metal frame.
  • the fastener 56 which is pressed against the hard component 60 by an operator (not shown) of the screwdriver 2, exerts a counter-pressure on the screw-in spindle 6 via the tool 12 and the tool holder 10.
  • this back pressure is also delivered to the output side end of the hollow spindle 8 so that it is displaced together with the screw 6 relative to the housing 4 against a direction of insertion E.
  • the clutch 30, as shown changes to the engagement position, in which both the first engagement means 38 and the second engagement means 42 are engaged.
  • the drive-side end of the insertion spindle 6 is displaced into a hammering space 64 formed by the electromagnet 18.
  • the hardened insert 24 now strikes the driving spindle 6 projecting into the striking space 64, whereby it is acted upon in the insertion direction E with a pulse-like axial force which drives the fastening means 56 through the hard component 60, as in FIG. 3 shown.
  • the locking body 48 are moved out of the recess 54 and moved into a disengaged position by the displacement of the drive spindle 6 relative to the hollow spindle 8, in which they no longer protrude into the longitudinal bore 52. Rather, the locking body 48 are now in the region of the expansion 66 on the inside of the guide sleeve 55 at. Thus, there is now between the drive spindle 6 and the hollow spindle 8 only acting in the direction of rotation positive engagement, while the axial positive engagement is canceled.
  • the hollow spindle 8 Upon reaching a set on a depth stop screw 70, the hollow spindle 8 is moved by the clutch springs 40, 44 in the direction of insertion E. In this case, the locking body 48 are brought via the shoulder 68 again in the area located outside of the expansion 66 of the guide sleeve 55, where they are held radially immovably between the inside of the guide sleeve 55 and the drive spindle 6.
  • the screwdriver 2 again assumes the starting position shown in Fig. 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP05108160A 2004-09-06 2005-09-06 Outil de serrage avec mécanisme d'impact axial Active EP1632313B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004042952A DE102004042952A1 (de) 2004-09-06 2004-09-06 Schraubgerät mit axial wirkendem Schlagmechanismus

Publications (2)

Publication Number Publication Date
EP1632313A1 true EP1632313A1 (fr) 2006-03-08
EP1632313B1 EP1632313B1 (fr) 2008-03-26

Family

ID=35430674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05108160A Active EP1632313B1 (fr) 2004-09-06 2005-09-06 Outil de serrage avec mécanisme d'impact axial

Country Status (3)

Country Link
US (1) US8499850B2 (fr)
EP (1) EP1632313B1 (fr)
DE (2) DE102004042952A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105666427A (zh) * 2014-12-04 2016-06-15 罗伯特·博世有限公司 具有转矩离合器的手持式工具机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6085225B2 (ja) 2013-06-27 2017-02-22 株式会社マキタ ネジ締め電動工具
USD725981S1 (en) 2013-10-29 2015-04-07 Black & Decker Inc. Screwdriver with nosepiece
US20150151424A1 (en) 2013-10-29 2015-06-04 Black & Decker Inc. Power tool with ergonomic handgrip
US11673243B2 (en) 2018-09-05 2023-06-13 Milwaukee Electric Tool Corporation Blind rivet nut-setting tool
WO2023009733A1 (fr) * 2021-07-28 2023-02-02 Milwaukee Electric Tool Corporation Outil de pose d'écrou à rivet aveugle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3804414A1 (de) * 1988-02-12 1989-08-24 Hilti Ag Bohrhammer mit kugelrastkupplung
US6035945A (en) * 1997-04-18 2000-03-14 Hitachi Koki Co., Ltd. Operating mode switching apparatus for a hammer drill
US6109149A (en) * 1998-09-25 2000-08-29 Hilti Aktiengesellschaft Screw setting tool
DE10032949A1 (de) 2000-07-06 2002-01-17 Hilti Ag Schraubgerät

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH278062A (de) * 1948-10-01 1951-09-30 Rohde & Doerrenberg Schnellwechselfutter zur Werkzeugeinspannung, für Werkzeugmaschinen.
US3616883A (en) * 1970-06-08 1971-11-02 Black & Decker Mfg Co Adjustable clutch
SE377900B (fr) 1974-01-15 1975-08-04 Atlas Copco Ab
DE3832202C1 (en) * 1988-09-22 1990-03-22 Robert Bosch Gmbh, 7000 Stuttgart, De Hand-held machine tool
DE3918227C1 (fr) * 1989-06-03 1990-11-15 C. & E. Fein Gmbh & Co, 7000 Stuttgart, De
DE4233712C2 (de) * 1992-10-07 1994-07-14 Ceka Elektrowerkzeuge Ag & Co Kraftangetriebenes Elektrohandwerkzeug
JP3284759B2 (ja) * 1994-06-09 2002-05-20 日立工機株式会社 インパクトドライバ
DE19527192A1 (de) * 1995-07-26 1997-01-30 Hilti Ag Schraubgerät
SE505895C2 (sv) * 1995-11-16 1997-10-20 Atlas Copco Tools Ab Kraftskruvdragare

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3804414A1 (de) * 1988-02-12 1989-08-24 Hilti Ag Bohrhammer mit kugelrastkupplung
US6035945A (en) * 1997-04-18 2000-03-14 Hitachi Koki Co., Ltd. Operating mode switching apparatus for a hammer drill
US6109149A (en) * 1998-09-25 2000-08-29 Hilti Aktiengesellschaft Screw setting tool
DE10032949A1 (de) 2000-07-06 2002-01-17 Hilti Ag Schraubgerät

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105666427A (zh) * 2014-12-04 2016-06-15 罗伯特·博世有限公司 具有转矩离合器的手持式工具机
US10940580B2 (en) 2014-12-04 2021-03-09 Robert Bosch Gmbh Hand-held power tool which includes a torque clutch

Also Published As

Publication number Publication date
EP1632313B1 (fr) 2008-03-26
US8499850B2 (en) 2013-08-06
DE502005003428D1 (de) 2008-05-08
DE102004042952A1 (de) 2006-03-23
US20060048956A1 (en) 2006-03-09

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