EP2996842B1 - Auxiliary handle - Google Patents

Auxiliary handle Download PDF

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Publication number
EP2996842B1
EP2996842B1 EP14727735.4A EP14727735A EP2996842B1 EP 2996842 B1 EP2996842 B1 EP 2996842B1 EP 14727735 A EP14727735 A EP 14727735A EP 2996842 B1 EP2996842 B1 EP 2996842B1
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EP
European Patent Office
Prior art keywords
draw rod
handle
spring
additional handle
stop
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.)
Active
Application number
EP14727735.4A
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German (de)
French (fr)
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EP2996842A1 (en
Inventor
Markus Holubarsch
Stefan Schmid
Stefan Hammerstingl
Ferdinand Kristen
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
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Priority to EP14727735.4A priority Critical patent/EP2996842B1/en
Publication of EP2996842A1 publication Critical patent/EP2996842A1/en
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Publication of EP2996842B1 publication Critical patent/EP2996842B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B25F5/025—Construction of casings, bodies or handles with torque reaction bars for rotary tools
    • B25F5/026—Construction of casings, bodies or handles with torque reaction bars for rotary tools in the form of an auxiliary handle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the present invention relates to an auxiliary handle for a hand tool.
  • Such an auxiliary handle according to the preamble of claim 1 is made EP1974867A1 known.
  • GB 200722762 A discloses an additional handle.
  • the auxiliary handle has a handle-shaped handle and an annular bracket, which can be attached to the neck of a drill, for example.
  • a bayonet catch clamps the open ends of the stirrup between the thighs of the handle to tighten the stirrup. To clamp and release the strap, the user needs one hand to hold the handle and another hand to open or close the latch.
  • the auxiliary handle according to the invention is intended for a hand tool machine, in particular a chiseling hand tool machine.
  • the user can grip the auxiliary handle on a handle body.
  • An annular bracket is provided for clamping on the power tool.
  • the hanger has two joinable ends.
  • a prestressed spring presses the collapsible ends against a stop to merge with a force acting in a direction of action.
  • a release device is held by the force acting in the effective direction of the force of the biased spring in a basic position. The user can deflect the release device against the acting in the direction of action force of the prestressed spring in a release position for canceling the compressible ends against the stop pushing force.
  • the auxiliary handle can be attached or detached with one hand on the hand tool.
  • the user brings only a force to release the auxiliary handle, a fastening is carried out by the prestressed spring.
  • the spring provides the basic position in which the two ends are brought together and thus tightened the annular bracket.
  • the spring achieves the lowest preload by tensioning the stirrup. Releasing is done by decoupling the spring from one side of the ends. For this purpose, the spring is not relaxed, but additionally stretched against their bias further.
  • the tension of the preloaded spring is in the release position of the release device higher than the preload of the preloaded spring in the home position of the release device.
  • One embodiment provides that a first end of the prestressed spring in the auxiliary handle is immovably applied, a second end of the prestressed spring is movable and the second end is coupled to the bracket and to the release device.
  • the movable end of the spring loads the bracket in the direction of action also loaded the movable end of the spring release device.
  • An embodiment provides that the ends of the annular bracket abuts on one side of the stop and the immovable first end of the prestressed spring on the side facing away from the one side of the stopper.
  • the preloaded spring exerts only in the effective direction, directly or indirectly, a force on the bracket.
  • the stop decouples the bracket from a force of the spring against the effective direction.
  • the stop is in particular immovable relative to the handle area.
  • An embodiment provides that the ends of the bracket are mounted in the radial direction on the pull rod and along the effective direction between the first end portion of the tie rod and the stop are arranged.
  • the user can advantageously create the bracket without the handle area on the power tool and only clamp for locking between the tie rod and spring.
  • the pull rod has a non-circular cross section with a larger radial dimension and a smaller radial dimension.
  • the ends of the stirrup had a cylindrical cavity with an inner diameter equal to the larger radial dimension and a longitudinal slot radially opening the cavity with a width equal to the smaller radial dimension.
  • the bracket must be in order to remove it pivoted in the correct orientation with respect to the pull rod.
  • One embodiment has a pull rod.
  • the pull rod is movable parallel to the direction of action relative to the stop and the ends of the bracket. In the basic position, a first end portion of the pull rod in the effective direction is non-positively coupled to the ends.
  • the prestressed spring is clamped between the stop and a second end portion of the drawbar, and the drawbar exerts a force in the direction of action out on the drawbar. In the release position, the first end portion of the pull rod is deflected against the force of the spring counter to the effective direction. The frictional coupling of the drawbar with the ends is canceled.
  • the release device includes a toggle.
  • a lever arm of the toggle lever can be permanently coupled to the tie rod or coupled against the effective direction non-positively with the tie rod or the spring.
  • left-hand elements are generally offset from associated right-hand elements in any direction common to all elements.
  • Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool .
  • the hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill bit 4, can be used.
  • a primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 .
  • a user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation.
  • the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.
  • the striking mechanism 6 is, for example, a pneumatic percussion 6.
  • An exciter 12 and a racket 13 are movably guided in a guide tube 14 of the percussion mechanism 6 along the working axis 10 .
  • the exciter 12 is coupled via an eccentric 7 or a wobble finger to the motor 8 and forced to a periodic, linear movement.
  • An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at.
  • the racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its pulse to the drill bit 4 via a substantially resting intermediate racket 16 .
  • the striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .
  • Fig. 2 shows the auxiliary handle 18 in its basic position
  • Fig. 3 shows the auxiliary handle 18 in its release position.
  • the user can grab the auxiliary handle 18 on a handle body 19 with one hand.
  • the gripping body 19 is substantially coaxial with a handle axis 20.
  • the gripping surface of the gripping body 19 can deviate from a right angle, be ergonomically shaped adapted to the contour of a hand.
  • the user derives an extension of his hand and forearm a holding force transverse to the handle axis 20, along a holding direction 21 a.
  • the grip body 19 in the direction of retention 21 opposite a mounting portion 22 is arranged, with which the auxiliary handle 18 can be attached to the hand tool 1 if necessary.
  • the handle-shaped configuration reduces the torque acting on the handle body 19 and the hand holding a hand tool by means of the auxiliary handle 18.
  • Two opposite along the holder direction 21 oriented leg 23, 24 connect the handle body 19 and mounting portion 22 to a closed frame.
  • the attachment portion 22 has a pull rod 25 whose axis 26 may be parallel to the handle axis 20 .
  • the pull rod 25 is suspended in a first (left) bearing block 27 and a second (right) bearing block 28 along its axis 26 movable.
  • the direction along the axis 26 from the left bracket 27 to the right bracket 28 is hereinafter referred to as the pulling direction 29 .
  • Each of the bearing blocks 27, 28 is rigidly attached to one of the legs 23, 24 .
  • the two facing each other ends of the bearing blocks 27, 28 are unconnected and against each other.
  • the handle body 19 and the legs 23, 24 have sufficient elasticity in order to increase the distance of the bearing blocks 27, 28 along the axis 26 by several millimeters.
  • the drawbar 25 has at its first (left) end a to the axis 26 radially projecting anchor 30.
  • a facing the direction of pull 29 facing surface of the left bearing block 27 forms a stop for the armature 30.
  • the drawbar 25 can be moved only in the pulling direction 29 with the left bearing block 27 .
  • the drawbar 25 is opposite to the pulling direction 29 on the left bracket 28 addition.
  • An inner diameter of the left bearing block 28 is adapted to the cross section of the tie rod 25 and less than the radial dimension of the armature 30th
  • the drawbar 25 has at its second (right) end a radially projecting plate 31st
  • a left sleeve 32 and a right sleeve 33 are placed on the tie rod 25 between the two bearing blocks 27, 28 .
  • Each of the sleeves 32, 33 is connected to a clamp 34 .
  • the two clamps 34 are movably connected to each other via a hinge 35 and together form an annular bracket 36.
  • the circumference of the bracket 36 is over the distance of the two sleeves 32, 33 variable.
  • the bracket 36 on the sleeves 32, 33 removed from the pull rod 25 ( Fig. 4 ) and unfolded. The user can put the unfolded bracket 36, for example, around the machine housing 17 near the tool holder 2 and then close it again.
  • the bracket 36 may also be realized by means of a flexible band.
  • the to the bearing blocks 27, 28 separately formed sleeves 32, 33 may also be connected to these, for example, if there is no need for a removable bracket 36 .
  • the left sleeve 32 is located on the left bearing block 27 and the right sleeve 33 abuts against the right bearing block 28 .
  • the bearing blocks 27, 28 and the sleeves 32, 33 may be provided in pairs with teeth 37, 38 at their end faces. The angular orientation of the bracket 36 to the handle body 19 relative to the axis 26 may thus be provided with detent positions.
  • a compression spring for example a helical spring 39, is arranged within the right bearing block 28 in parallel, for example coaxially, to the drawbar 25 .
  • a first (left) end of the coil spring 39 is supported on a supporting surface 40 formed by the right bearing block 28 or otherwise secured to the right bearing block 28 .
  • the left end of the coil spring 39 is thus immovable.
  • the second (right) end abuts against the plate 31 of the drawbar 25 .
  • the right end can move, for example, by moving the drawbar 25 in the pulling direction 29 .
  • the effective direction 29 of the helical spring 39 coincides with the pulling direction 29 .
  • the coil spring 39 is inserted under permanent bias between the right bracket 28 and the plate 31 of the tie rod 25 .
  • the armature 30 is in a row permanently on the left bearing block 27 and pulls it under the action of the coil spring 39 in the pulling direction 29 to the right bracket 28.
  • the two sleeves 32, 33 are of the left bracket 27 in the direction of action 29 of the coil spring 39 against the pushed right bracket 28 .
  • the circumference of the bracket 36 is shortened and consequently the bracket 36 clamps against the hand tool 1 .
  • the exemplary additional handle 18 can be released by means of a toggle lever.
  • the toggle lever has a lever handle 41, which the user can grip and pull to the handle body 19 .
  • the lever handle 41 and the handle body 19 are approximately parallel to each other.
  • the user can grip around the handle body 19 without simultaneously gripping the lever handle 41 .
  • a distance of the lever handle 41 to the handle body 19 in the holding direction 21 is for example in the range between 3 cm and 5 cm.
  • the toggle lever has a first lever arm 42 and a second lever arm 43, which are connected via a knee joint 44 .
  • the first lever arm 42 is provided with a hinge and the second lever arm 43 is also provided with a pivot 45 on the right leg 24 .
  • the first lever arm 42 is rigidly connected to the lever handle 41 .
  • the second lever arm 43 is connected by means of a pin 46 with the tie rod 25 .
  • the second lever arm 43 is deflected counter to the direction of action 29 coil spring 39 when the user pulls the lever handle 41 to the handle body 19 .
  • the pull rod 25 is moved against the pulling direction / effective direction 29 .
  • the armature 30 releases from the left bracket 27.
  • the power flow to the sleeves 32, 33 is interrupted.
  • the sleeves 32, 33 can move away from each other on the axis 26 , to reduce by expanding the bracket 36 whose tension.
  • the displacement of the pull rod 25 takes place against the direction of action 29 of the coil spring 39.
  • the plate 31 of the pull rod 25 moves toward the support surface 40 .
  • the movable end of the coil spring 39 is brought closer to the immovable, whereby the tension of the coil spring 39 is increased beyond the bias.
  • the toggle proves to be particularly suitable to apply the necessary force to compress the coil spring 39 .
  • Other known lever mechanisms with a high gear ratio are also suitable.
  • the overcoming bias is preferably in the range between 100 Newton and 2000 Newton.
  • the short actuating path of the toggle lever, which is a result of the high transmission ratio, is sufficient, in particular with a removable bracket 36 .
  • the lever handle 41 is preferably held under pretension in its basic position.
  • the bias voltage is applied by the coil spring 39 .
  • the lever handle 41 automatically goes to its normal position and does not flutter during the chiseling operation of the power tool 1.
  • Fig. 8 shows a cross-section through an exemplary sleeve 32 perpendicular to the axis 26.
  • the tie rod 25 preferably has one or two opposite flattened sides 47 in the region of the sleeve 32.
  • the radial dimension 48 of the tie rod 25 perpendicular to the sides 47 is less than in other angular directions.
  • the other sides are cylindrical, for example.
  • the sleeve 32 has a cylindrical cavity whose inner diameter 49 corresponds to the diameter of the drawbar 25 .
  • the sleeve 32 can be rotated freely around the pull rod 25 .
  • the sleeve 32 is also slotted along the axis 26 .
  • a dimension of the slot 50 parallel to the axis 26 corresponds to the smallest radial dimension 48 of the tie rod 25.
  • the dimension 48 is thus smaller than the inner diameter of the cylindrical cavity.
  • the bracket 36 can only be removed from the pull rod 25 , when the flattened sides 47 are aligned parallel to the slot 50 .
  • the bracket 34 is preferably wound in this case by 90 degrees to the handle body 19 .
  • FIGS. 6 and 7 show a further embodiment of the auxiliary handle 51 in basic position or in the release position for removal / attachment to the power tool 1.
  • the embodiment is true in most elements with the auxiliary handle 18 of FIGS. 2 and 3 why a complete repetition of all features is omitted and reference is made to the preceding description.
  • the auxiliary handle 51 has, for example, a flexible metal band 52, instead of which two rigid clamps 34 can be used.
  • the metal band 52 is suspended from mutually movable two sleeves 32, 33 .
  • the two sleeves 32, 33 are mounted between a first (left) bearing block 53 and a (right) second bearing block 28 on a pull rod 25 .
  • the pull rod 25 is biased by the spring 39 in the direction 29 .
  • the spring 39 is supported on the right bearing block 28 , which is immovably connected to the handle body 19 .
  • the left bearing block 53 is movable along the pull rod 25 relative to the handle body 19 .
  • the kraftbeaufschlagte pull rod 25 presses with an anchor 54 on the left bracket 53 and moves it while in the direction 29 to the sleeves 32, 33 to clamp on this the metal strip 52 .
  • the handle body 19 does not have to deform.
  • the left bearing block 53 may be inserted in a guide 55 connected to the handle body 19 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)

Description

GEBIET DER ERFINDUNGFIELD OF THE INVENTION

Die vorliegende Erfindung betrifft einen Zusatzhandgriff für eine Handwerkzeugmaschine. Ein solcher Zusatzhandgriff gemäß dem Oberbegriff von Anspruch 1 ist aus EP1974867A1 bekannt.The present invention relates to an auxiliary handle for a hand tool. Such an auxiliary handle according to the preamble of claim 1 is made EP1974867A1 known.

GB 200722762 A offenbart einen Zusatzhandgriff. Der Zusatzhandgriff hat einen henkelförmigen Griffs und einen ringförmigen Bügel, der beispielsweise an dem Hals einer Bohrmaschine befestigt werden kann. Ein Bajonettverschluss klemmt die offenen Enden des Bügels zwischen den Schenkeln des Griffs ein, um den Bügel zu spannen. Zum Spannen und Lösen des Bügels benötigt der Anwender eine Hand, um den Griff zu halten, und eine weitere Hand, um den Verschluss zu öffen bzw. zu schließen. GB 200722762 A discloses an additional handle. The auxiliary handle has a handle-shaped handle and an annular bracket, which can be attached to the neck of a drill, for example. A bayonet catch clamps the open ends of the stirrup between the thighs of the handle to tighten the stirrup. To clamp and release the strap, the user needs one hand to hold the handle and another hand to open or close the latch.

OFFENBARUNG DER ERFINDUNGDISCLOSURE OF THE INVENTION

Der erfindungsgemäße Zusatzhandgriff ist für eine Handwerkzeugmaschine, insbesondere eine meißelnde Handwerkzeugmaschine, vorgesehen. Der Anwender kann den Zusatzhandgriff an einem Griffkörper greifen. Ein ringförmiger Bügel ist zum Festklemmen an der Handwerkzeugmaschine vorgesehen. Der Bügel hat zwei zusammenführbare Enden. Eine vorgespannte Feder drückt die zusammenführbaren Enden, zum Zusammenführen mit einer in einer Wirkrichtung wirkenden Kraft gegen einen Anschlag. Eine Freigabeeinrichtung, ist von der in die Wirkrichtung wirkenden Kraft der vorgespannten Feder in einer Grundstellung gehalten. Der Anwender kann die Freigabeeinrichtung gegen die in die Wirkrichtung wirkendende Kraft der vorgespannten Feder in eine Freigabestellung zum Aufheben der die zusammenführbaren Enden gegen den Anschlag drückenden Kraft auslenken.The auxiliary handle according to the invention is intended for a hand tool machine, in particular a chiseling hand tool machine. The user can grip the auxiliary handle on a handle body. An annular bracket is provided for clamping on the power tool. The hanger has two joinable ends. A prestressed spring presses the collapsible ends against a stop to merge with a force acting in a direction of action. A release device is held by the force acting in the effective direction of the force of the biased spring in a basic position. The user can deflect the release device against the acting in the direction of action force of the prestressed spring in a release position for canceling the compressible ends against the stop pushing force.

Der Zusatzhandgriff kann mit einer Hand an der Handwerkzeugmaschine befestigt bzw. gelöst werden. Der Anwender bringt nur eine Kraft zum Lösen des Zusatzgriffs auf, ein Befestigen erfolgt durch die vorgespannte Feder. Die Feder gibt die Grundstellung vor, in welcher die beiden Ende zusammengeführt sind und damit der ringförmige Bügel gespannt. Die Feder erreicht die geringste Vorspannung, indem der Bügel gespannt wird. Das Freigeben erfolgt durch ein Entkoppeln der Feder von einer Seite der Enden. Dazu wird die Feder jedoch nicht entspannt, sondern zusätzlich gegen ihre Vorspannung weiter gespannt. Die Spannung der vorgespannten Feder ist in der Freigabestellung der Freigabeeinrichtung höher als die Vorspannung der vorgespannten Feder in der Grundstellung der Freigabeeinrichtung.The auxiliary handle can be attached or detached with one hand on the hand tool. The user brings only a force to release the auxiliary handle, a fastening is carried out by the prestressed spring. The spring provides the basic position in which the two ends are brought together and thus tightened the annular bracket. The spring achieves the lowest preload by tensioning the stirrup. Releasing is done by decoupling the spring from one side of the ends. For this purpose, the spring is not relaxed, but additionally stretched against their bias further. The tension of the preloaded spring is in the release position of the release device higher than the preload of the preloaded spring in the home position of the release device.

Eine Ausgestaltung sieht vor, dass ein erstes Ende der vorgespannten Feder in dem Zusatzhandgriff unbeweglich angelegt ist, ein zweites Ende der vorgespannten Feder beweglich ist und das zweite Ende mit dem Bügel und mit der Freigabeeinrichtung gekoppelt ist. Das bewegliche Ende der Feder belastet den Bügel in Wirkrichtung ebenso belastet das bewegliche Ende der Feder die Freigabeeinrichtung. Beim Überführen der Freigabeeinrichtung von der Grundstellung in die Freigabestellung wird der an das bewegliche Ende der Feder angekoppelte Teil der Freigabeeinrichtung entgegen der Wirkrichtung ausgelenkt.One embodiment provides that a first end of the prestressed spring in the auxiliary handle is immovably applied, a second end of the prestressed spring is movable and the second end is coupled to the bracket and to the release device. The movable end of the spring loads the bracket in the direction of action also loaded the movable end of the spring release device. When transferring the release device from the basic position to the release position of the coupled to the movable end of the spring part of the release device is deflected against the effective direction.

Eine Ausgestaltung sieht vor, dass die Enden, des ringförmigen Bügels an einer Seite des Anschlags und das unbewegliche erste Ende der vorgespannten Feder an der von der einen Seite abgewandten Seite des Anschlags anliegt. Die vorgespannte Feder übt nur in Wirkrichtung, unmittelbar oder mittelbar, eine Kraft auf den Bügel aus. Der Anschlag entkoppelt den Bügel von einer Kraft der Feder entgegen der Wirkrichtung. Der Anschlag ist insbesondere unbeweglich gegenüber dem Griffbereich.An embodiment provides that the ends of the annular bracket abuts on one side of the stop and the immovable first end of the prestressed spring on the side facing away from the one side of the stopper. The preloaded spring exerts only in the effective direction, directly or indirectly, a force on the bracket. The stop decouples the bracket from a force of the spring against the effective direction. The stop is in particular immovable relative to the handle area.

Eine Ausgestaltung sieht vor, dass die Enden des Bügels in radialer Richtung auf die Zugstange aufgesteckt sind und längs Wirkrichtung zwischen dem ersten Endabschnitt der Zugstange und dem Anschlag angeordnet sind. Der Anwender kann den Bügel vorteilhafterweise ohne den Griffbereich an der Handwerkzeugmaschine anlegen und erst zum Verriegeln zwischen Zugstange und Feder einspannen.An embodiment provides that the ends of the bracket are mounted in the radial direction on the pull rod and along the effective direction between the first end portion of the tie rod and the stop are arranged. The user can advantageously create the bracket without the handle area on the power tool and only clamp for locking between the tie rod and spring.

Eine Ausgestaltung sieht vor, dass die Zugstange einen nicht-kreisförmigen Querschnitt mit einer größeren radialen Abmessung und einer kleineren radialen Abmessung aufweist. Die Enden, des Bügels wiesen einen zylindrischen Hohlraum mit einem Innendurchmesser gleich der größeren radialen Abmessung und einen den Hohlraum radial öffnenden Längsschlitz mit einer Breite gleich der kleineren radialen Abmessung auf. Der Bügel muss um ihn abzunehmen in die richtige Orientierung bezüglich der Zugstange verschwenkt sein.An embodiment provides that the pull rod has a non-circular cross section with a larger radial dimension and a smaller radial dimension. The ends of the stirrup had a cylindrical cavity with an inner diameter equal to the larger radial dimension and a longitudinal slot radially opening the cavity with a width equal to the smaller radial dimension. The bracket must be in order to remove it pivoted in the correct orientation with respect to the pull rod.

Eine Ausgestaltung hat eine Zugstange. Die Zugstange ist parallel zu der Wirkrichtung gegenüber dem Anschlag und den Enden, des Bügels beweglich. In der Grundstellung ist ein erster Endabschnitt der Zugstange in Wirkrichtung kraftschlüssig mit den Enden, gekoppelt. Die vorgespannte Feder ist zwischen dem Anschlag und einem zweiten Endabschnitt der Zugstange eingespannt, und die Zugstange übt eine Kraft in Wirkrichtung auf die Zugstange aus. In der Freigabestellung ist der erste Endabschnitt der Zugstange gegen die Kraft der Feder entgegen der Wirkrichtung ausgelenkt. Die kraftschlüssige Kopplung der Zugstange mit den Enden, ist aufgehoben.One embodiment has a pull rod. The pull rod is movable parallel to the direction of action relative to the stop and the ends of the bracket. In the basic position, a first end portion of the pull rod in the effective direction is non-positively coupled to the ends. The prestressed spring is clamped between the stop and a second end portion of the drawbar, and the drawbar exerts a force in the direction of action out on the drawbar. In the release position, the first end portion of the pull rod is deflected against the force of the spring counter to the effective direction. The frictional coupling of the drawbar with the ends is canceled.

Eine Ausgestaltung sieht vor, dass die Freigabeeinrichtung einen Kniehebel, beinhaltet. Ein Hebelarm des Kniehebels, kann dauerhaft mit der Zugstange gekoppelt oder entgegen der Wirkrichtung kraftschlüssig mit der Zugstange oder der Feder gekoppelt sein.An embodiment provides that the release device includes a toggle. A lever arm of the toggle lever, can be permanently coupled to the tie rod or coupled against the effective direction non-positively with the tie rod or the spring.

KURZE BESCHREIBUNG DER FIGURENBRIEF DESCRIPTION OF THE FIGURES

Die nachfolgende Beschreibung erläutert die Erfindung anhand von exemplarischen Ausführungsformen und Figuren. In den Figuren zeigen:

Fig. 1
einen Bohrhammer
Fig. 2
einen Zusatzhandgriff in Grundstellung
Fig. 3
den Zusatzhandgriff in Freigabestellung
Fig. 4
den Zusatzhandgriff mit abgenommenen Bügel
Fig. 5
einen Teilquerschnitt des Zusatzhandgriffs
Fig. 6
einen Zusatzhandgriff in Grundstellung
Fig. 7
den Zusatzhandgriff in Freigabestellung
The following description explains the invention with reference to exemplary embodiments and figures. In the figures show:
Fig. 1
a hammer drill
Fig. 2
an additional handle in basic position
Fig. 3
the additional handle in release position
Fig. 4
the auxiliary handle with removed strap
Fig. 5
a partial cross section of the auxiliary handle
Fig. 6
an additional handle in basic position
Fig. 7
the additional handle in release position

Gleiche oder funktionsgleiche Elemente werden durch gleiche Bezugszeichen in den Figuren indiziert, soweit nicht anders angegeben. Die Beschreibung verwendet die Begriffe links und rechts in Anlehnung an die Darstellung in den Figuren, um die relative Orientierung längs einer Achse anzugeben. Soweit im Einzelnen nicht anders angegeben, sind allgemein linke Elemente gegenüber zugehörigen rechten Elementen in einer beliebigen, aber für alle Elemente gemeinsamen Richtung versetzt.Identical or functionally identical elements are indicated by the same reference numerals in the figures, unless stated otherwise. The description uses the terms left and right, based on the representation in the figures, to indicate the relative orientation along an axis. Unless otherwise stated in detail, left-hand elements are generally offset from associated right-hand elements in any direction common to all elements.

AUSFÜHRUNGSFORMEN DER ERFINDUNGEMBODIMENTS OF THE INVENTION

Fig. 1 zeigt als Beispiel einer meißelnden Handwerkzeugmaschine schematisch einen Bohrhammer 1. Der Bohrhammer 1 hat eine Werkzeugaufnahme 2, in welche ein Schaftende 3 eines Werkzeug, z.B. eines des Bohrmeißels 4, eingesetzt werden kann. Einen primären Antrieb des Bohrhammers 1 bildet ein Motor 5, welcher ein Schlagwerk 6 und eine Abtriebswelle 7 antreibt. Ein Anwender kann den Bohrhammer 1 mittels eines Handgriffs 8 führen und mittels eines Systemschalters 9 den Bohrhammer 1 in Betrieb nehmen. Im Betrieb dreht der Bohrhammer 1 den Bohrmeißel 4 kontinuierlich um eine Arbeitsachse 10 und kann dabei den Bohrmeißel 4 in Schlagrichtung 11 längs der Arbeitsachse 10 in einen Untergrund schlagen. Fig. 1 schematically shows a hammer drill 1 as an example of a chiseling hand tool . The hammer drill 1 has a tool holder 2, in which a shank end 3 of a tool, for example one of the drill bit 4, can be used. A primary drive of the hammer drill 1 is a motor 5, which drives a striking mechanism 6 and an output shaft 7 . A user can guide the hammer drill 1 by means of a handle 8 and take means of a system switch 9, the hammer drill 1 is in operation. In operation, the hammer drill 1 rotates the drill bit 4 continuously about a working axis 10 and can beat the drill bit 4 in the direction of impact 11 along the working axis 10 in a substrate.

Das Schlagwerk 6 ist beispielsweise ein pneumatisches Schlagwerk 6. Ein Erreger 12 und ein Schläger 13 sind in einem Führungsrohr 14 des Schlagwerks 6 längs der Arbeitsachse 10 beweglich geführt. Der Erreger 12 ist über einen Exzenter 7 oder einen Taumelfinger an den Motor 8 angekoppelt und zu einer periodischen, linearen Bewegung gezwungen. Eine Luftfeder gebildet durch eine pneumatische Kammer 15 zwischen Erreger 12 und Schläger 13 koppelt eine Bewegung des Schlägers 13 an die Bewegung des Erregers 12 an. Der Schläger 13 kann direkt auf ein hinteres Ende des Bohrmeißels 4 aufschlagen oder mittelbar über einen im Wesentlichen ruhenden Zwischenschläger 16 einen Teil seines Impuls auf den Bohrmeißel 4 übertragen. Das Schlagwerk 6 und vorzugsweise die weiteren Antriebskomponenten sind innerhalb eines Maschinengehäuses 17 angeordnet.The striking mechanism 6 is, for example, a pneumatic percussion 6. An exciter 12 and a racket 13 are movably guided in a guide tube 14 of the percussion mechanism 6 along the working axis 10 . The exciter 12 is coupled via an eccentric 7 or a wobble finger to the motor 8 and forced to a periodic, linear movement. An air spring formed by a pneumatic chamber 15 between exciter 12 and racket 13 couples a movement of the racket 13 to the movement of the exciter 12 at. The racket 13 can strike directly on a rear end of the drill bit 4 or indirectly transfer part of its pulse to the drill bit 4 via a substantially resting intermediate racket 16 . The striking mechanism 6 and preferably the further drive components are arranged within a machine housing 17 .

Fig. 2 zeigt den Zusatzhandgriff 18 in seiner Grundstellung, Fig. 3 zeigt den Zusatzhandgriff 18 in seiner Freigabestellung. Fig. 2 shows the auxiliary handle 18 in its basic position, Fig. 3 shows the auxiliary handle 18 in its release position.

Der Anwender kann den Zusatzhandgriff 18 an einem Griffkörper 19 mit einer Hand greifen. Der Griffkörper 19 ist im Wesentlichen koaxial zu einer Griffachse 20. Die Grifffläche des Griffkörpers 19 kann abweichend von einem rechten Winkel, ergonomisch an die Kontur einer Hand angepasst ausgeformt sein. Der Anwender leitet in Verlängerung seiner Hand und Unterarms eine Haltekraft quer zu der Griffachse 20, längs einer Halterichtung 21 ein. Dem Griffkörper 19 in Halterichtung 21 gegenüberliegend ist ein Befestigungsabschnitt 22 angeordnet, mit welchem der Zusatzhandgriff 18 bei Bedarf an der Handwerkzeugmaschine 1 befestigt werden kann. Die henkelförmige Ausgestaltung verringert auf den Griffkörper 19 und die Hand einwirkende Drehmomente beim Halten einer Handwerkzeugmaschine mittels des Zusatzhandgriffs 18. Zwei gegenüberliegende längs der Halterrichtung 21 orientierte Schenkel 23, 24 verbinden den Griffkörper 19 und Befestigungsabschnitt 22 zu einem geschlossen Rahmen.The user can grab the auxiliary handle 18 on a handle body 19 with one hand. The gripping body 19 is substantially coaxial with a handle axis 20. The gripping surface of the gripping body 19 can deviate from a right angle, be ergonomically shaped adapted to the contour of a hand. The user derives an extension of his hand and forearm a holding force transverse to the handle axis 20, along a holding direction 21 a. The grip body 19 in the direction of retention 21 opposite a mounting portion 22 is arranged, with which the auxiliary handle 18 can be attached to the hand tool 1 if necessary. The handle-shaped configuration reduces the torque acting on the handle body 19 and the hand holding a hand tool by means of the auxiliary handle 18. Two opposite along the holder direction 21 oriented leg 23, 24 connect the handle body 19 and mounting portion 22 to a closed frame.

Der Befestigungsabschnitt 22 hat eine Zugstange 25, deren Achse 26 parallel zu der Griffachse 20 sein kann. Die Zugstange 25 ist in einem ersten (linken) Lagerbock 27 und einem zweiten (rechten) Lagerbock 28 längs ihrer Achse 26 beweglich aufgehängt. Die Richtung längs der Achse 26 von dem linken Lagerbock 27 zu dem rechten Lagerbock 28 ist nachfolgend als Zugrichtung 29 bezeichnet.The attachment portion 22 has a pull rod 25 whose axis 26 may be parallel to the handle axis 20 . The pull rod 25 is suspended in a first (left) bearing block 27 and a second (right) bearing block 28 along its axis 26 movable. The direction along the axis 26 from the left bracket 27 to the right bracket 28 is hereinafter referred to as the pulling direction 29 .

Jeder der Lagerböcke 27, 28 ist an einem der Schenkel 23, 24 starr befestigt. Die beiden aufeinander zuweisenden Enden der Lagerböcke 27, 28 sind unverbunden und gegeneinander beweglich. Der Griffkörper 19 und die Schenkel 23, 24 weisen eine ausreichende Elastizität auf, um den Abstand der Lagerböcke 27, 28 längs der Achse 26 um mehrere Millimeter vergrößern zu können.Each of the bearing blocks 27, 28 is rigidly attached to one of the legs 23, 24 . The two facing each other ends of the bearing blocks 27, 28 are unconnected and against each other. The handle body 19 and the legs 23, 24 have sufficient elasticity in order to increase the distance of the bearing blocks 27, 28 along the axis 26 by several millimeters.

Die Zugstange 25 hat an ihrem ersten (linken) Ende einen zur Achse 26 radial vorstehenden Anker 30. Eine entgegen der Zugrichtung 29 weisende Fläche des linken Lagerbocks 27 bildet einen Anschlag für den Anker 30. Sobald der Anker 30 an dem linken Lagerbock 27 anliegt, kann die Zugstange 25 nur unter Mitnahme des linken Lagerbocks 27 in die Zugrichtung 29 bewegt werden. Bei der beispielhaften Ausgestaltung steht die Zugstange 25 entgegen der Zugrichtung 29 über den linken Lagerbock 28 hinaus. Ein Innendurchmesser des linken Lagerbocks 28 ist an den Querschnitt der Zugstange 25 angepasst und geringer als die radiale Abmessung des Ankers 30. The drawbar 25 has at its first (left) end a to the axis 26 radially projecting anchor 30. A facing the direction of pull 29 facing surface of the left bearing block 27 forms a stop for the armature 30. As soon as the armature 30 abuts against the left bearing block 27 , the drawbar 25 can be moved only in the pulling direction 29 with the left bearing block 27 . In the exemplary embodiment, the drawbar 25 is opposite to the pulling direction 29 on the left bracket 28 addition. An inner diameter of the left bearing block 28 is adapted to the cross section of the tie rod 25 and less than the radial dimension of the armature 30th

Die Zugstange 25 hat an ihrem zweiten (rechten) Ende einen radial vorstehenden Teller 31. The drawbar 25 has at its second (right) end a radially projecting plate 31st

Eine linke Hülse 32 und eine rechte Hülse 33 sind auf der Zugstange 25 zwischen den beiden Lagerböcken 27, 28 aufgesetzt. Jede der Hülsen 32, 33 ist mit einer Schelle 34 verbunden. Die beiden Schellen 34 sind über ein Gelenk 35 miteinander beweglich verbunden und bilden zusammen einen ringförmigen Bügel 36. Der Umfang des Bügels 36 ist über den Abstand der beiden Hülsen 32, 33 veränderbar. In der beispielhaften Ausgestaltung kann der Bügel 36 an den Hülsen 32, 33 von der Zugstange 25 abgenommen (Fig. 4) und aufgeklappt werden. Der Anwender kann den aufgeklappten Bügel 36 beispielsweise um das Maschinengehäuse 17 nahe des Werkzeughalters 2 legen und danach wieder zuklappen. Anstelle von Schellen 34 kann der Bügel 36 auch mittels eines flexiblen Bandes realisiert sein. Die zu den Lagerböcken 27, 28 separat ausgebildeten Hülsen 32, 33 können mit diesen auch verbunden sein, z.B. wenn kein Bedarf für einen abnehmbaren Bügel 36 besteht.A left sleeve 32 and a right sleeve 33 are placed on the tie rod 25 between the two bearing blocks 27, 28 . Each of the sleeves 32, 33 is connected to a clamp 34 . The two clamps 34 are movably connected to each other via a hinge 35 and together form an annular bracket 36. The circumference of the bracket 36 is over the distance of the two sleeves 32, 33 variable. In the exemplary embodiment, the bracket 36 on the sleeves 32, 33 removed from the pull rod 25 ( Fig. 4 ) and unfolded. The user can put the unfolded bracket 36, for example, around the machine housing 17 near the tool holder 2 and then close it again. Instead of clamps 34 , the bracket 36 may also be realized by means of a flexible band. The to the bearing blocks 27, 28 separately formed sleeves 32, 33 may also be connected to these, for example, if there is no need for a removable bracket 36 .

Die linke Hülse 32 liegt an dem linken Lagerbock 27 und die rechte Hülse 33 liegt an dem rechten Lagerbock 28 an. Die Lagerböcke 27, 28 und die Hülsen 32, 33 können paarweise mit Verzahnungen 37, 38 an ihren Stirnflächen versehen sein. Die Winkelorientierung des Bügels 36 zu dem Griffkörper 19 bezogen auf die Achse 26 kann somit mit Raststellungen versehen sein.The left sleeve 32 is located on the left bearing block 27 and the right sleeve 33 abuts against the right bearing block 28 . The bearing blocks 27, 28 and the sleeves 32, 33 may be provided in pairs with teeth 37, 38 at their end faces. The angular orientation of the bracket 36 to the handle body 19 relative to the axis 26 may thus be provided with detent positions.

Eine Druckfeder, beispielsweise eine Schraubenfeder 39, ist innerhalb des rechten Lagerbocks 28 parallel, z.B. koaxial, zu der Zugstange 25 angeordnet. Ein erstes (linkes) Ende der Schraubenfeder 39 ist an einer von dem rechten Lagerbock 28 gebildeten Abstützfläche 40 abgestützt oder in anderer Weise an dem rechten Lagerbock 28 befestigt. Das linke Ende der Schraubenfeder 39 ist somit unbeweglich. Das zweite (rechte) Ende liegt an dem Teller 31 der Zugstange 25 an. Das rechte Ende kann sich beispielsweise unter Verschieben der Zugstange 25 in die Zugrichtung 29 bewegen. Den rechten Lagerbock 28 als stationär betrachtend, fällt die Wirkrichtung 29 der Schraubenfeder 39 mit der Zugrichtung 29 zusammen.A compression spring, for example a helical spring 39, is arranged within the right bearing block 28 in parallel, for example coaxially, to the drawbar 25 . A first (left) end of the coil spring 39 is supported on a supporting surface 40 formed by the right bearing block 28 or otherwise secured to the right bearing block 28 . The left end of the coil spring 39 is thus immovable. The second (right) end abuts against the plate 31 of the drawbar 25 . The right end can move, for example, by moving the drawbar 25 in the pulling direction 29 . Considering the right bearing block 28 as stationary, the effective direction 29 of the helical spring 39 coincides with the pulling direction 29 .

Die Schraubenfeder 39 ist unter permanenter Vorspannung zwischen dem rechten Lagerbock 28 und dem Teller 31 der Zugstange 25 eingesetzt. Der Anker 30 liegt in Folge permanent an dem linken Lagerbock 27 an und zieht diesen unter Wirkung der Schraubenfeder 39 in Zugrichtung 29 zu dem rechten Lagerbock 28. Die beiden Hülsen 32, 33 werden von dem linken Lagerbock 27 in Wirkrichtung 29 der Schraubenfeder 39 gegen den rechten Lagerbock 28 geschoben. Der Umfang des Bügels 36 ist gekürzt und in Folge klemmt der Bügel 36 an die Handwerkzeugmaschine 1 an.The coil spring 39 is inserted under permanent bias between the right bracket 28 and the plate 31 of the tie rod 25 . The armature 30 is in a row permanently on the left bearing block 27 and pulls it under the action of the coil spring 39 in the pulling direction 29 to the right bracket 28. The two sleeves 32, 33 are of the left bracket 27 in the direction of action 29 of the coil spring 39 against the pushed right bracket 28 . The circumference of the bracket 36 is shortened and consequently the bracket 36 clamps against the hand tool 1 .

Der beispielhafte Zusatzhandgriff 18 lässt sich mittels eines Kniehebels freigeben. Der Kniehebel hat einen Hebelgriff 41, welchen der Anwender greifen und zu dem Griffkörper 19 ziehen kann. Der Hebelgriff 41 und der Griffkörper 19 sind etwa parallel zueinander. Vorzugsweise kann der Anwender den Griffkörper 19 umgreifen ohne zugleich den Hebelgriff 41 zu greifen. Ein Abstand des Hebelgriffs 41 zu dem Griffkörper 19 in Halterichtung 21 liegt beispielsweise im Bereich zwischen 3 cm und 5 cm. Der Kniehebel hat einen ersten Hebelarm 42 und einen zweiten Hebelarm 43, welche über ein Kniegelenk 44 verbunden sind. Die erste Hebelarm 42 ist mit einem Drehgelenk und der zweite Hebelarm 43 ist ebenfalls mit einem Drehgelenk 45 an dem rechten Schenkel 24 angelegt. Der erste Hebelarm 42 ist starr mit dem Hebelgriff 41 verbunden. Der zweite Hebelarm 43 ist mittels eines Zapfens 46 mit der Zugstange 25 verbunden.The exemplary additional handle 18 can be released by means of a toggle lever. The toggle lever has a lever handle 41, which the user can grip and pull to the handle body 19 . The lever handle 41 and the handle body 19 are approximately parallel to each other. Preferably, the user can grip around the handle body 19 without simultaneously gripping the lever handle 41 . A distance of the lever handle 41 to the handle body 19 in the holding direction 21 is for example in the range between 3 cm and 5 cm. The toggle lever has a first lever arm 42 and a second lever arm 43, which are connected via a knee joint 44 . The first lever arm 42 is provided with a hinge and the second lever arm 43 is also provided with a pivot 45 on the right leg 24 . The first lever arm 42 is rigidly connected to the lever handle 41 . The second lever arm 43 is connected by means of a pin 46 with the tie rod 25 .

Der zweite Hebelarm 43 wird entgegen der Wirkrichtung 29 Schraubenfeder 39 ausgelenkt, wenn der Anwender den Hebelgriff 41 zu dem Griffkörper 19 zieht. Mit dem zweiten Hebelarm 43 wird die Zugstange 25 gegen die Zugrichtung/Wirkrichtung 29 verschoben. Der Anker 30 löst sich von dem linken Lagerbock 27. Der Kraftfluss auf die Hülsen 32, 33 ist unterbrochen. Die Hülsen 32, 33 können sich auf der Achse 26 voneinander entfernen, um durch Aufweiten des Bügels 36 dessen Spannung zu verringern.The second lever arm 43 is deflected counter to the direction of action 29 coil spring 39 when the user pulls the lever handle 41 to the handle body 19 . With the second lever arm 43 , the pull rod 25 is moved against the pulling direction / effective direction 29 . The armature 30 releases from the left bracket 27. The power flow to the sleeves 32, 33 is interrupted. The sleeves 32, 33 can move away from each other on the axis 26 , to reduce by expanding the bracket 36 whose tension.

Das Verschieben der Zugstange 25 erfolgt gegen die Wirkrichtung 29 der Schraubenfeder 39. Der Teller 31 der Zugstange 25 bewegt sich auf die Abstützfläche 40 zu. Das bewegliche Ende der Schraubenfeder 39 wird dem unbeweglichen angenähert, wodurch die Spannung der Schraubenfeder 39 über die Vorspannung hinaus erhöht wird.The displacement of the pull rod 25 takes place against the direction of action 29 of the coil spring 39. The plate 31 of the pull rod 25 moves toward the support surface 40 . The movable end of the coil spring 39 is brought closer to the immovable, whereby the tension of the coil spring 39 is increased beyond the bias.

Der Kniehebel erweist sich als besonders geeignet, um die notwendige Kraft zum Zusammendrücken der Schraubenfeder 39 aufzubringen. Andere bekannte Hebelmechanismen mit einem hohen Übersetzungsverhältnis sind ebenfalls geeignet. Die zu überwindende Vorspannung liegt vorzugsweise im Bereich zwischen 100 Newton und 2000 Newton. Der in Folge des hohen Übersetzungsverhältnisses kurze Stellweg des Kniehebels ist insbesondere bei einem abnehmbaren Bügel 36 ausreichend.The toggle proves to be particularly suitable to apply the necessary force to compress the coil spring 39 . Other known lever mechanisms with a high gear ratio are also suitable. The overcoming bias is preferably in the range between 100 Newton and 2000 Newton. The short actuating path of the toggle lever, which is a result of the high transmission ratio, is sufficient, in particular with a removable bracket 36 .

Der Hebelgriff 41 ist vorzugsweise unter Vorspannung in seiner Grundstellung gehalten. Die Vorspannung wird durch die Schraubenfeder 39 aufgebracht. Der Hebelgriff 41 geht automatisch in seine Grundstellung und flattert nicht während des meißelnden Betriebs der Handwerkzeugmaschine 1. The lever handle 41 is preferably held under pretension in its basic position. The bias voltage is applied by the coil spring 39 . The lever handle 41 automatically goes to its normal position and does not flutter during the chiseling operation of the power tool 1.

Fig. 8 zeigt einen Querschnitt durch eine beispielhafte Hülse 32 senkrecht zu der Achse 26. Die Zugstange 25 hat vorzugsweise im Bereich der Hülse 32 eine oder zwei gegenüberliegende abgeflachten Seiten 47. Die radiale Abmessung 48 der Zugstange 25 senkrecht zu den Seiten 47 ist geringer als in anderen Winkelrichtungen. Die anderen Seiten sind beispielsweise zylindrisch.Fig. 8 shows a cross-section through an exemplary sleeve 32 perpendicular to the axis 26. The tie rod 25 preferably has one or two opposite flattened sides 47 in the region of the sleeve 32. The radial dimension 48 of the tie rod 25 perpendicular to the sides 47 is less than in other angular directions. The other sides are cylindrical, for example.

Die Hülse 32 hat einen zylindrischen Hohlraum, dessen Innendurchmesser 49 dem Durchmesser der Zugstange 25 entspricht. Die Hülse 32 kann frei um die Zugstange 25 gedreht werden. Die Hülse 32 ist zudem längs der Achse 26 geschlitzt. Eine Abmessung des Schlitzes 50 parallel zu der Achse 26 entspricht der geringsten radialen Abmessung 48 der Zugstange 25. Die Abmessung 48 ist somit geringer als der Innendurchmesser des zylindrischen Hohlraums. Der Bügel 36 kann von der Zugstange 25 nur abgezogen werden, wenn die abgeflachten Seiten 47 parallel zu dem Schlitz 50 ausgerichtet sind. Der Bügel 34 ist vorzugsweise hierbei um 90 Grad zu der Griffkörper 19 angewickelt.The sleeve 32 has a cylindrical cavity whose inner diameter 49 corresponds to the diameter of the drawbar 25 . The sleeve 32 can be rotated freely around the pull rod 25 . The sleeve 32 is also slotted along the axis 26 . A dimension of the slot 50 parallel to the axis 26 corresponds to the smallest radial dimension 48 of the tie rod 25. The dimension 48 is thus smaller than the inner diameter of the cylindrical cavity. The bracket 36 can only be removed from the pull rod 25 , when the flattened sides 47 are aligned parallel to the slot 50 . The bracket 34 is preferably wound in this case by 90 degrees to the handle body 19 .

Fig. 6 und 7 zeigen eine weitere Ausgestaltung des Zusatzhandgriffs 51 in Grundstellung bzw. in Freigabestellung zum Abnehmen/Befestigen an der Handwerkzeugmaschine 1. Die Ausführungsform stimmt in den meisten Elementen mit dem Zusatzhandgriff 18 der Fig. 2 und 3 überein, weshalb auf eine vollständige Wiederholung aller Merkmale verzichtet und auf die vorhergehende Beschreibung verwiesen wird. 6 and 7 show a further embodiment of the auxiliary handle 51 in basic position or in the release position for removal / attachment to the power tool 1. The embodiment is true in most elements with the auxiliary handle 18 of FIGS. 2 and 3 why a complete repetition of all features is omitted and reference is made to the preceding description.

Der Zusatzhandgriff 51 hat beispielhaft ein flexibles Metallband 52, anstelle dessen auch zwei starre Schellen 34 verwendet werden können. Das Metallband 52 ist an zueinander beweglichen zwei Hülsen 32, 33 aufgehängt. Die beiden Hülsen 32, 33 sind zwischen einem ersten (linken) Lagerbock 53 und einem (rechten) zweiten Lagerbock 28 auf einer Zugstange 25 aufgesteckt. Die Zugstange 25 ist durch die Feder 39 in der Richtung 29 vorgespannt. Die Feder 39 stützt sich an dem rechten Lagerbock 28 ab, der unbeweglich mit dem Griffkörper 19 verbunden ist. Der linke Lagerbock 53 ist längs der Zugstange 25 gegenüber dem Griffkörper 19 beweglich. Die kraftbeaufschlagte Zugstange 25 drückt mit einem Anker 54 auf den linken Lagerbock 53 und verschiebt diesen dabei in die Richtung 29 auf die Hülsen 32, 33 zu, um über diese das Metallband 52 anzuklemmen. Der Griffkörper 19 muss sich dabei nicht deformieren. Der linke Lagerbock 53 kann in einer mit dem Griffkörper 19 verbundenen Führung 55 eingesetzt sein.The auxiliary handle 51 has, for example, a flexible metal band 52, instead of which two rigid clamps 34 can be used. The metal band 52 is suspended from mutually movable two sleeves 32, 33 . The two sleeves 32, 33 are mounted between a first (left) bearing block 53 and a (right) second bearing block 28 on a pull rod 25 . The pull rod 25 is biased by the spring 39 in the direction 29 . The spring 39 is supported on the right bearing block 28 , which is immovably connected to the handle body 19 . The left bearing block 53 is movable along the pull rod 25 relative to the handle body 19 . The kraftbeaufschlagte pull rod 25 presses with an anchor 54 on the left bracket 53 and moves it while in the direction 29 to the sleeves 32, 33 to clamp on this the metal strip 52 . The handle body 19 does not have to deform. The left bearing block 53 may be inserted in a guide 55 connected to the handle body 19 .

Claims (9)

  1. Additional handle (18) for a hand-held machine tool (1) with
    a handle body (19) for gripping by the hand of a user,
    a ring-shaped bar (36), having two ends (32, 33) which can be brought together for clamping securely to the hand-held machine tool (1),
    a pre-tensioned spring (39), which presses the ends (32, 33) which can be brought together such as bring them together and exert a force on them in an effect direction (29) against a stop (40),
    a release device (41, 43), which, by the force exerted in the effect direction (29) by the pre-tensioned spring (39), is held in a basic position, and which can be moved by a user, against the force of the pre-tensioned spring (36) exerted in the effect direction (29), into a release position, such as to relieve the force pressing the ends against the stop, characterized in that the tension of the pre-tensioned spring (39) in the release position of the release device (41) is higher than the pre-tension of the pre-tensioned spring in the basic position of the release device (41).
  2. Additional handle according to claim 1, characterized in that a first end of the pre-tensioned spring (39) is immovably located in the additional handle (18), a second end of the pre-tensioned spring (39) is movable, and the second end of the spring (39) is coupled to the bar (36) and to the release device (41).
  3. Additional handle (18) according to claim 2, characterized in that the ends (32, 33) of the ring-shaped bar (36) are in contact on one side of the stop (40), and the immovable first end of the pre-tensioned spring (39) is in contact on the side of the stop (40) facing away from the first side.
  4. Additional handle (18) according to any one of the preceding claims, characterizing a draw rod (25), which can be moved parallel to the effect direction (29) in relation to the stop (40) and the ends (32,33) of the bar (36), wherein, in the basic position, a first end section (30) of the draw rod (25) is coupled in the effect direction (29) in non-positive fit to the ends (32,33), and the pre-tensioned spring (39), tensioned between the stop (40) and a second end section (31) of the draw rod (25), exerts a force in the effect direction (29) onto the draw rod (25).
  5. Additional handle (18) according to claim 4, characterized in that, in the release position, the first end section (30) of the draw rod (25) is moved against the force of the spring (39), against the effect direction (29), and the non-positive coupling of the draw rod (25) to the ends (32, 33) is suspended.
  6. Additional handle (18) according to claim 4 or 5, characterized in that the ends (32, 33) of the bar (36) are located in the radial direction onto the draw rod (25), and are arranged along the effect direction (29) between the first end section (30) of the draw rod (25) and the stop (40).
  7. Additional handle (18) according to claim 6, characterized in that the draw rod (25) exhibits a non-circular cross-section with a larger radial dimension (48) and a smaller radial dimension (48), and the ends (32, 33) of the bar (36) comprise a cylindrical cavity space with an inner diameter (49) which is equal to the larger radial dimension, and a longitudinal slot (50), opening the cavity space radially, with a width equal to the smaller radial dimension (48).
  8. Additional handle (18) according to any one of the preceding claims, characterized in that the release device (41) contains an elbow lever (42, 43).
  9. Additional handle (18) according to claim 8, characterized in that a lever arm (43) of the elbow lever (42, 43) is coupled to the draw rod (25).
EP14727735.4A 2013-05-16 2014-05-14 Auxiliary handle Active EP2996842B1 (en)

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EP13168118.1A EP2803450A1 (en) 2013-05-16 2013-05-16 Auxiliary handle
EP14727735.4A EP2996842B1 (en) 2013-05-16 2014-05-14 Auxiliary handle
PCT/EP2014/059812 WO2014184222A1 (en) 2013-05-16 2014-05-14 Auxiliary handle

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EP2996842B1 true EP2996842B1 (en) 2019-10-09

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JP (1) JP6151439B2 (en)
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WO2015061370A1 (en) 2013-10-21 2015-04-30 Milwaukee Electric Tool Corporation Adapter for power tool devices
US11077542B2 (en) * 2013-10-31 2021-08-03 Stanley Fastening Systems, L.P. Metal connector adaptor for a fastening tool
EP3034245A1 (en) * 2014-12-19 2016-06-22 HILTI Aktiengesellschaft Auxiliary handle
US11433524B2 (en) * 2018-12-19 2022-09-06 George E. Westinghouse Vibration reducing extension system
US11583992B2 (en) * 2021-03-25 2023-02-21 Milwaukee Electric Tool Corporation Side handle for power tool

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EP2332696A2 (en) * 2009-12-09 2011-06-15 HILTI Aktiengesellschaft Auxiliary handle

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WO2014184222A1 (en) 2014-11-20
US20160114472A1 (en) 2016-04-28
JP6151439B2 (en) 2017-06-21
CN105392601A (en) 2016-03-09
US9701007B2 (en) 2017-07-11
CN105392601B (en) 2017-09-08
EP2996842A1 (en) 2016-03-23
JP2016517807A (en) 2016-06-20
EP2803450A1 (en) 2014-11-19

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