EP4245468A1 - Poignée latérale pour une machine-outil portative électrique - Google Patents

Poignée latérale pour une machine-outil portative électrique Download PDF

Info

Publication number
EP4245468A1
EP4245468A1 EP22162090.9A EP22162090A EP4245468A1 EP 4245468 A1 EP4245468 A1 EP 4245468A1 EP 22162090 A EP22162090 A EP 22162090A EP 4245468 A1 EP4245468 A1 EP 4245468A1
Authority
EP
European Patent Office
Prior art keywords
clamping
side handle
handle
clamping unit
designed
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.)
Pending
Application number
EP22162090.9A
Other languages
German (de)
English (en)
Inventor
Karin Groth
Daniela Lachica Koch
Markus Sommer
Steffen Mucha
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
Priority to EP22162090.9A priority Critical patent/EP4245468A1/fr
Priority to PCT/EP2023/055552 priority patent/WO2023174723A1/fr
Publication of EP4245468A1 publication Critical patent/EP4245468A1/fr
Pending legal-status Critical Current

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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

Definitions

  • the present invention relates to a side handle for an electric hand-held power tool.
  • the side handle has a grip area designed for gripping by a user and a clamping unit.
  • the side handle can be releasably attached to a machine neck of the hand-held power tool, the clamping unit having an operating element by means of which the clamping unit can be clamped and relaxed.
  • EP 1 974 867 B1 discloses a handle for a hand-held machine tool having a pair of clamping halves, an operating device having an operating part adapted to open and close the clamping halves relative to the holder part, and a handle body configured for gripping by an operator.
  • Such side handles are exposed to high mechanical tension due to firm clamping on a machine tool, which means a large load on all components of the side handle and in particular on the handle. This mechanical tension can often lead to damage to individual components or to complete failure of the side handle.
  • the task is therefore solved by a side handle for an electric hand-held machine tool.
  • the side handle has a grip area designed for gripping by a user and a clamping unit.
  • the side handle can be releasably attached to a machine neck of the hand-held power tool, the clamping unit having an operating element by means of which the clamping unit can be clamped and relaxed.
  • the clamping unit essentially contains a clamping lever, a clamping element, a counter-clamping element and a connecting device and when clamping the clamping unit a force flow runs through the clamping unit and the counter-clamping element is movable relative to the grip area
  • the handle area may contain at least one guide element through which the counter-clamping element can be guided in at least one direction.
  • the guide element may contain a through hole so that the counter-clamping element can be guided in an axial direction.
  • the clamping element may be designed as a first locking sleeve.
  • the clamping element may contain a helical link with at least a first and second section, the first section having a first pitch and the second section having a second pitch and the first pitch being greater than that second slope.
  • the first slope can be designed to be stiffer than the second slope. Due to the large gradient, a relatively large axial distance can be covered by a relatively small rotational movement of the clamping element. In comparison, due to the small gradient, a relatively large rotational movement has to be covered for a relatively small axial distance. Due to the two different slopes on the link of the clamping element, a different effect can be achieved when turning the clamping lever or when clamping the clamping unit.
  • the counter-clamping element may be designed as a second locking sleeve.
  • the connecting device may contain a first and second connecting piece.
  • the closure element may be designed as a twist lock.
  • the operating element is designed as a clamping lever.
  • the tensioning lever is relative to the Handle area rotatable about an axis of rotation on the side handle.
  • the axis of rotation preferably runs perpendicular to a working axis of the hand-held power tool when the side handle is attached to the hand-held power tool.
  • the rotation of the clamping lever about the axis of rotation is limited to 360 degrees, preferably to 110 degrees.
  • a stop is formed on the clamping lever, which is preferably designed to be complementary to a counter-stop provided on the handle area.
  • the handle area can have a hollow profile or can essentially be formed by one.
  • the clamping unit can have two cylindrical section-shaped clamping bodies, each of which is oriented coaxially to a clamping screw of the clamping unit running in the axis of rotation.
  • the clamping unit preferably has a clamping band holder and a clamping band provided for encompassing the machine neck.
  • one of the cylindrical section-shaped clamping bodies is formed in one piece with the clamping lever or is at least connected to it in a rotationally fixed manner.
  • the tension band holder can have two holding bodies, preferably exactly two holding bodies.
  • the clamping screw can be connected to the clamping lever in a rotationally fixed manner, for example via a hexagon.
  • the tension band is hooked or can be hooked into the tension band holder.
  • the tension band is advantageously designed to be free of a through hole intended for a tension screw. This has the advantage that the side handle can be pre-assembled at the factory and can only be mounted on hand-held power tools whose tool holder has a larger diameter than their machine neck by unhooking or re-hooking the tension band. In the case of side handles of the prior art, an essentially complete dismantling of the side handle, or at least of the clamping unit, is typically required in such circumstances. Due to the advantageous design of the tension band holder with a attachable tension band, time savings and thus also cost savings can be achieved during assembly.
  • the tension band holder has a recess set back in the radial direction with a retaining lug, such that instead of the suspended tension band with a first diameter, a second tension band with a second diameter that is different from the first can be attached.
  • the holding nose can have a spring contact surface whose curvature is greater than a clamping surface of the tension band holder that is in contact with the machine neck.
  • one and the same clamping banner holder can be used for hand-held power tools with different machine neck diameters.
  • a system consisting of a side handle with a plurality of tension straps of different diameters is advantageously provided, with each of the tension straps being able to be hooked into one and the same tension strap holder.
  • the clamping banner holder has two holding bodies lying coaxially to one another, with at least one of the holding bodies being clampable to one of the cylindrical section-shaped clamping bodies via a cone-hollow cone pairing.
  • a second holding body can be clamped to a handle end piece of the side handle via a cone-hollow cone pairing.
  • the handle end piece can be formed in one piece with a handle area.
  • the cone-hollow cone pairing can be assigned a cone formed on the second clamping body and/or a hollow cone formed on the first holding body, or vice versa.
  • a cone-hollow cone pairing can be provided between the handle end piece and the second holding body.
  • the clamping banner holder can have at least one surface section which, based on the remaining part of the clamping holder, has an increased coefficient of friction and/or an increased modulus of elasticity.
  • a side handle for an electric hand-held power tool, wherein the side handle has a grip area designed for gripping by a user and a clamping unit, by means of which the side handle can be releasably attached to a machine neck of the hand-held power tool, the clamping unit having an operating element by means of which the clamping unit can be clamped and relaxed.
  • the clamping unit further has a clamping band holder and a clamping band provided for encompassing the machine neck, the clamping band being suspended in the clamping band holder and preferably free of a through hole intended for a clamping screw.
  • the tension band holder can have a recess set back in the radial direction with a retaining lug such that instead of the attached tension band with a first diameter, a second tension band with a second one that is different from the first Diameter can be hung, the holding nose preferably having a spring contact surface, the curvature of which is greater than a clamping surface of the tension band holder that is in contact with the machine neck.
  • the side handle can be designed in a corresponding manner by the features described with reference to the exemplary embodiments of the side handle according to the invention.
  • a side handle for an electric hand-held power tool, wherein the side handle has a grip area designed for gripping by a user and a clamping unit, by means of which the side handle can be releasably attached to a machine neck of the hand-held power tool, the clamping unit having an operating element by means of which the clamping unit can be clamped and relaxed.
  • the tension band holder can, on a side facing the machine neck, have at least one surface section which, based on the remaining part of the tension holder, has an increased coefficient of friction and/or an increased modulus of elasticity.
  • the side handle can be designed in a corresponding manner by the features described with reference to the exemplary embodiments of the side handle according to the invention.
  • a side handle for an electric hand-held power tool, wherein the side handle has a grip area designed for gripping by a user and a clamping unit, by means of which the side handle can be releasably attached to a machine neck of the hand-held power tool, the clamping unit having an operating element by means of which the clamping unit can be clamped and relaxed.
  • the clamping unit can have two cylindrical section-shaped clamping bodies, which are each oriented coaxially to a clamping screw of the clamping unit running in the axis of rotation, and further have a clamping banner holder with two holding bodies lying coaxially to one another, at least one of the holding bodies having a cone-hollow cone pairing with one of the cylindrical section-shaped Clamping body can be clamped.
  • the side handle can be designed in a corresponding manner by the features described with reference to the exemplary embodiments of the side handle according to the invention.
  • FIG. 1 A preferred embodiment of a side handle 1 according to the invention for an electric machine tool 2, for example a chisel hammer, is shown in Figure 1 shown.
  • the machine tool 2 designed as a chisel hammer, essentially contains a housing 3, a main handle 4 and a tool holder 5, cf. Figure 1 .
  • the housing 3 has a front end 3a, a rear end 3b, a top 3c and a bottom 3d.
  • the tool holder 5 is positioned, which in turn is designed to receive and hold a tool 6 designed as a chisel.
  • a drive Inside the machine tool 2 there is, among other things, a drive, an impact device, a gearbox and a control device.
  • the drive, the impact device, the gearbox and the control device are not shown in the figures.
  • a machine neck 7 is provided, to which the side handle 1 can be mounted.
  • the side handle 1 serves as an additional holding and guiding means for holding and guiding the machine tool 2.
  • the side handle 1 is in detail Figures 2 to 8 shown and essentially contains a clamping unit 8 with a handle area 9, a clamping lever 10, a closure cap 11, a clamping element 12, a clamping screw 13, a counter-clamping element 14, a connecting device 15, a tension band 36 and a closure element 17.
  • the tensioning lever 10 contains an operating element 18 at a first end 10a of the tensioning lever 10 and a driver element 19 at a second end 10b of the tensioning lever 10.
  • the driver element 19 serves to interact with the clamping element 12 and has a circular receiving area 20 with two opposite elevations 20a, 20b on.
  • the elevations 20a, 20b can also be referred to as cams.
  • the clamping screw 13 is elongated or cylindrical and essentially serves to hold together or support the clamping unit 8.
  • a screw head 21 is provided at a first end 13a and a thread 22 for a screw nut 23 is provided at a second end 13b.
  • the clamping element 12 is designed as a first locking sleeve.
  • the clamping element 12 designed as a first locking sleeve contains a cylindrical base body 24, a ramp device 25 on one first end 24a of the base body 24 and a crown toothing 26 at a second end 24b of the base body 24.
  • the ramp device 25 serves to interact with the driver element 19 of the clamping lever 10 and is designed in the present exemplary embodiment as a helix-shaped link 28 with two ramp elements 29.
  • the helix-shaped backdrop can also be referred to as a spiral, helical or screw-shaped backdrop.
  • the helix-shaped backdrop can also be referred to as a backdrop or ramp device with two helix-shaped ramp elements.
  • the first slope can be designed to be stiffer than the second slope. Due to the large gradient, a relatively large axial distance can be covered by a relatively small rotational movement of the clamping element 12. In comparison, due to the small gradient, a relatively large rotational movement has to be covered for a relatively small axial distance. Due to the two different slopes on the link 28 of the clamping element 12, a different effect can be achieved when turning the clamping lever 10 or when clamping the clamping unit 8.
  • the counter-clamping element 14 is designed as a second locking sleeve.
  • the counter-clamping element 14 designed as a second locking sleeve contains a cylindrical base body 32 with a crown toothing 33 at one end 32a of the base body 32.
  • Three anti-rotation devices 34 in the form of elevations are also positioned on the outer surface of the base body 32 of the second locking sleeve 14.
  • Anti-rotation devices 35 in the form of elevations are also positioned on the inner jacket wall of the base body 32 of the second locking sleeve 14.
  • the connecting device 15 essentially serves as a tension band holder for receiving and holding a tension band 36 and contains a first and second connecting piece 15a, 15b. Both the first and second connecting pieces 15a, 15b each contain a cylindrical base body 37 with a central through hole 38 and an arcuate guide arm 39. As in Figure 7 indicated, each base body 37 has a blind hole 40 laterally offset from the central through hole 38.
  • the first and second connectors 15a, 15b are designed essentially identically in the present exemplary embodiment. These arcuate guide arms 39 serve to guide the essentially circular clamping band 36 and to ensure that the connecting pieces 15a, 15b are in close contact with the machine neck 7 of the machine tool 2.
  • the tension band 36 can have different diameters for correspondingly different diameters of a machine neck 7.
  • each arcuate guide arm 39 has a locking element 41 at a free end, cf. Figure 7 .
  • the correspondingly curved ends of the tension band 36 can be hung on the locking element 41.
  • the curved ends of the tension band 36 can also be referred to as hooks.
  • a crown toothing 42 is provided at a first end of each cylindrical base body 37. This crown toothing 42 on a connecting piece 15a, 15b is designed to correspond to the crown toothing 26, 33 on the first and second locking sleeves 12, 14.
  • the corresponding crown toothing 42 on the connecting pieces 15a, 15b and on the locking sleeves 12, 14 serves for a releasable rotation lock between the locking sleeves 12, 14 and the connecting pieces 15a, 15b.
  • a pin 43 is positioned at a second end of each cylindrical base body 37 of the first and second connecting pieces 15a, 15b. The pin 43 is laterally offset from the central through-hole 38 and positioned opposite the blind hole 40 at the first end of the base body 37 with respect to the central through-hole 38. If as in Figures 6 to 8 indicated that the two connecting pieces 15a, 15b are arranged opposite each other, the free end of the pin 43 can be brought from the first connecting piece 15a into the correspondingly designed blind hole 40 of the second connecting piece 15b. By connecting the pin 43 into the blind hole 40, the two connecting pieces 15a, 15b are prevented from rotating relative to one another.
  • the closure element 17 is essentially designed as a screw cap or screw and serves as a sealing means at the lower end of the clamping unit 8 and as a receiving element for the thread and the nut of the clamping screw 13.
  • the handle area 9 is curved and contains a first and second end 9a, 9b.
  • a sleeve element 44 is provided at the first end 9a and a guide element 45 is provided at the second end 9b.
  • the sleeve element 44 at the first end 9a is essentially designed in two parts with a first and second ring element 46, 47.
  • the first ring element 46 contains three recesses 48, which are part of the three Anti-rotation devices 27 of the clamping element 12 are designed accordingly.
  • the guide element 45 at the second end 9b is designed as a through hole with three recesses 49.
  • the recesses 49 are designed to correspond to the three anti-rotation devices 34 on the counter-clamping element 14, cf. Figure 8 .
  • the clamping element 12 designed as a first locking sleeve is positioned in the first ring element 47 of the handle area 9.
  • the clamping lever 10 is positioned on the handle area 9 so that the driver element 19 is aligned with the circular receiving area 20 in the second ring element 47.
  • the first and second connecting pieces 15a, 15b of the connecting device 15 are arranged oppositely between the first ring element 46 and the guide element 45.
  • the counter-clamping element 14, designed as a second locking sleeve, is positioned in the guide element 45, which is designed as a through-hole.
  • the clamping screw 13 is guided with the second end 13b from above in direction A through the sleeve element 44 of the handle area 9, the driver element 19 of the clamping lever 10, the clamping element 12, the first and second connecting pieces 15a, 15b, the counter-clamping element 14.
  • the screw nut 23 is mounted on the thread 22 and the closure element 17 at the first end 13a of the clamping screw 13.
  • the closure cap 11 closes the corresponding opening on the closure element 17.
  • FIGs 2 to 4 and 19 the side handle 1 or the clamping unit 8 is shown in a clamped state.
  • the side handle 1 In the clamped state, the side handle 1 is firmly or immovably mounted on the machine neck 7 of the machine tool 2 and cannot be rotated relative to the machine neck 7, so that the side handle 1 can be used to hold and guide the machine tool 2.
  • the control element 18 of the tensioning lever 10 rests ergonomically advantageously in a corresponding recess on the handle area 9.
  • the two elevations press on the rising sections of the helix-shaped ramp elements 29 of the clamping element 12, so that the driver element 19 pushes the clamping element 12 in direction A and against the direction of rotation DR as well as around the axis of rotation DA.
  • the clamping element 12 presses with its crown teeth 26 on the crown teeth 42 of the first connecting piece 15a. This in turn moves the first connecting piece 15a in direction A to the second connecting piece 15b or moves the two connecting pieces 15a, 15b towards each other, so that the tension band 36 connected to the connecting pieces 15a, 15b is contracted or the diameter of the tension band 36 is reduced.
  • a force flow KF runs only through the clamping unit 8 and not through the handle area 9.
  • the friction on the machine neck 7 of a machine tool 2 is increased in such a way that the side handle 1 is firmly connected to the housing 3 of the machine tool 2.
  • Figure 20 the side handle 1 or the clamping unit 8 is shown in a relaxed state.
  • the diameter of the tension band 36 is increased, so that the side handle 1 can be rotated relative to the machine neck 7 or can also be removed from the machine neck 7.
  • the clamping lever 10 is rotated in the direction of rotation DR about the axis of rotation DA, so that the elevations 20a, 20b of the driver element 19 slide down in the direction A on the slopes of the ramp elements 29 of the clamping element 12 and there is no longer any pressure Driver elements 19 are exerted on the ramp elements 29.
  • the clamping element 12 and also the first connecting pieces 15a can be moved against the direction A.
  • the two connecting pieces 15a, 15b can be moved away from each other without the pressure of the driver element 19 on the clamping element 12, so that the tension band 36 connected to the connecting pieces 15a, 15b is relaxed or the diameter of the tension band 36 is increased.
  • the clamping element 12 is moved in direction A relative to the sleeve element 44 of the grip area 9 and the counter-clamping element 14 is moved in direction A relative to the guide element 45 of the handle area 9.
  • the handle area 10 can, for example, consist of or have polypropylene, ABS, polyamide or polyurethane.
  • the tensioning lever 10 can be made of the same material as the handle area 9.
  • the tensioning lever 10 can consist of or have a thermoplastic elastomer (TPE).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
EP22162090.9A 2022-03-15 2022-03-15 Poignée latérale pour une machine-outil portative électrique Pending EP4245468A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP22162090.9A EP4245468A1 (fr) 2022-03-15 2022-03-15 Poignée latérale pour une machine-outil portative électrique
PCT/EP2023/055552 WO2023174723A1 (fr) 2022-03-15 2023-03-06 Poignée latérale pour un outil électrique portatif

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22162090.9A EP4245468A1 (fr) 2022-03-15 2022-03-15 Poignée latérale pour une machine-outil portative électrique

Publications (1)

Publication Number Publication Date
EP4245468A1 true EP4245468A1 (fr) 2023-09-20

Family

ID=80780623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22162090.9A Pending EP4245468A1 (fr) 2022-03-15 2022-03-15 Poignée latérale pour une machine-outil portative électrique

Country Status (2)

Country Link
EP (1) EP4245468A1 (fr)
WO (1) WO2023174723A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1400317A1 (fr) * 2002-09-19 2004-03-24 Atlas Copco Electric Tools GmbH Poignée auxiliaire
EP1974867B1 (fr) 2007-03-29 2009-12-09 Makita Corporation Poignées pour outils manuels
DE102008042114A1 (de) * 2008-09-15 2010-03-18 Hilti Aktiengesellschaft Zusatzhandgriff für eine Handwerkzeugmaschine
EP3034245A1 (fr) * 2014-12-19 2016-06-22 HILTI Aktiengesellschaft Poignée supplémentaire
EP3756833A1 (fr) * 2019-06-26 2020-12-30 Hilti Aktiengesellschaft Poignée latérale pour une machine portative électrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1400317A1 (fr) * 2002-09-19 2004-03-24 Atlas Copco Electric Tools GmbH Poignée auxiliaire
EP1974867B1 (fr) 2007-03-29 2009-12-09 Makita Corporation Poignées pour outils manuels
DE102008042114A1 (de) * 2008-09-15 2010-03-18 Hilti Aktiengesellschaft Zusatzhandgriff für eine Handwerkzeugmaschine
EP3034245A1 (fr) * 2014-12-19 2016-06-22 HILTI Aktiengesellschaft Poignée supplémentaire
EP3756833A1 (fr) * 2019-06-26 2020-12-30 Hilti Aktiengesellschaft Poignée latérale pour une machine portative électrique

Also Published As

Publication number Publication date
WO2023174723A1 (fr) 2023-09-21

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