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
  • B25F5/006—Vibration damping means

Definitions

• the invention is based on a hand tool, in particular a hand-held angle grinder, of the type defined in the preamble of claim 1.
• the handle is held on the motor housing of the hand-held power tool by means of a handle holding device arranged in between, which has a holder fastened by means of screws to the motor housing in the form of a pipe end piece with a protruding ring. Furthermore, there is at least one vibration damping element connected to the holder and the handle.
• the handle ends in a bell overlapping the holder, in which the vibration damping element is received on both sides of the protruding ring of the holder in such a way that the vibration damping element rests on the one hand on the ring of the holder and on the other on respective axial surfaces of the bell of the handle.
• the arrangement is such that the respective vibration damping elements prevent a relative displacement of the handle relative to the holder.
• Handle such as this e.g. from DE 41 02 838 AI or DE 195 46 328 AI can be seen and is sought, is not possible here.
• the handheld power tool according to the invention with the features of claim 1 has the advantage that an almost complete vibration decoupling between the handle and the motor housing is achieved while maintaining the function of a pivotable handle, largely allowing the continued use of existing series components. Due to the special handle holding device, safe handling of the hand tool is ensured by securing the at least one vibration damping element against damage and securing an operator handling the hand tool in the event of a fault Vibration damping element, for example if this breaks, prevents the motor housing from being separated from the handle. All of this results in a compact, inexpensive and simple construction.
• the vibration damping element of the handle holding device can be seen from the outside of the handheld power tool and thus also recognizable whether it is possibly defective or is beginning to become defective.
• FIG. 1 is a schematic side view of a hand-held electric angle grinder
• FIG. 2 is a perspective, partially sectioned view of a handle holding device of the angle grinder in FIG. 1,
• FIG. 3 is an exploded perspective view of the handle holding device in FIG. 2,
• FIGS. 2 and 3 shows a schematic side view of the handle holding device in FIGS. 2 and 3.
• the hand-held electric angle grinder 10 shown schematically in FIG. 1 as an exemplary embodiment of a general hand-held power tool has a motor housing 11, on one end of which a gear head 12 with projecting drive spindle 13 for a grinding wheel 14 is fixedly arranged and on the other end of which a handle 15 about the longitudinal central axis of the Motor housing 11 is pivotally arranged and covers the end face of the motor housing 11 at least largely dustproof.
• the handle 15 consists of a handle 16, which is enclosed by hand when working with the angle grinder 10, and of a bracket 17 attached to it in one piece, which covers the handle 16 on the underside while leaving a through opening 18 and when working with the angle grinder 10 covers the fingers placed around the handle 16 in a protective manner.
• a switch strip 19 projects into the passage opening 18, which actuates an on / off switch for an electric drive motor, which is accommodated in the motor housing 11.
• the handle 15, which represents the main handle, is pivotally adjustable on the motor housing 11 by means of a fixing device (not shown further) in such a way that at least three different relative pivot positions are possible between the motor housing 11 and the handle 15 by pivoting about the longitudinal central axis of the motor housing 11.
• angle grinder 10 is used for so-called roughing or grinding. In this relative position, the grinding wheel 14 runs essentially parallel to the switch strip 19.
• the angle grinder 10 can be prepared for the “cutting” operation by pivoting the handle 15 or the motor housing 11 to the left or right by 90 °.
• the handle 15 maintains its position, the motor housing 11 together with the gear head 12 being pivoted through 90 °, so that the grinding wheel 14 assumes the position shown in dashed lines in FIG. 1, in which the grinding wheel 14 can now function as a cutting wheel
• the fixing device is released by means of an indicated actuator 21. Details of the fixing device, not shown, and the relative swivel adjustment between the motor housing 11 and the handle 15 can be seen, for example, from DE 195 46 328 AI, to which reference is made for the purposes of the disclosure ,
• the handle 15 is held on the motor housing 11 by means of a handle holding device 30 arranged in between.
• This has a holder 40 fastened in the region of the front end of the motor housing 11 and at least one vibration damping element 50 connected to the holder 40 and the handle 15.
• the handle holding device 30 also has a Mounting plate 60 on which the handle 15 by means of the fixing device such. B. is attached according to DE 195 46 328 AI.
• the at least one vibration damping element 50 viewed in the direction of the longitudinal central axis of the motor housing 11, is arranged between the holder 40 and the mounting plate 60 and is firmly connected to both to form a single component.
• the holder 40 and / or the receiving plate 60 is, for. B.
• the fixed connection of the holder 40 and the receiving plate 60 with the vibration damping element 50 located between them is preferably carried out by vulcanizing or the like, in any case such that the holder 40, the vibration damping element 50 and the
• Receiving plate 60 are firmly connected to a unitary component such that this component can transmit forces in the axial direction and also transversely thereto, whereby vibrations generated by the vibration damping element 50 when the angle grinder 10 is switched on and when working with it are damped in such a way that they are removed from the handle 15 and the operator are kept as far as possible.
• Vibration damping element 50 thus causes vibration decoupling between the handle 15 on the one hand and the motor housing 11 with all the elements of the angle grinder 10 contained therein and connected thereto on the other hand.
• the at least one vibration damping element 50 consists of an elastomer and is designed as a ring part which has three axially spaced, circumferential ribs 51 on the outer circumferential region and radially recessed, open to the outside grooves 52 between them.
• the vibration damping element 50 can be damaged as a result of the operational loads, for. B. tear, either from
• the fastening members 70 pass through the unitary component, formed from the holder 40, the vibration damping element 50 and the mounting plate 60, and engage with one end 72 on the motor housing 11. These ends 72 engage e.g. B. in schematically indicated in Fig. 3 sleeves 22 in a part 20 of the motor housing 11.
• the fastening members 70 consist advantageously of screws 73, the shaft 74 on a left in Fig. 3 section with a z. B. is provided self-tapping thread and at the end of this threaded portion has a stop part 76, in particular in the form of a collar, with which the respective screws 73 engage the holder 40 and clamp it to the motor housing 11.
• the securing elements 71 consist of a screw head 77 on the end. In the exemplary embodiment shown, the handle holding device 30 has four such securing elements 71, which are arranged at substantially equal circumferential angular distances from one another.
• the holder 40 is formed from a ring 41 which has eyes 43 provided with passages 42 for the fastening members 70, in particular screws 73, against which the respective stop part 76, in particular the collar, of the screws 73 rests such that the holder 40 on the motor housing 11, in particular its part 20, is axially clamped.
• the holder 40 is reinforced with a metal part 44, in particular a metal ring, which forms the eyes 43 with the passages 42 therein.
• the holder 40 is, for. B. made of plastic, wherein the metal part 44 is injected therein. This further improves the secure hold of the holder 40 on the motor housing 11.
• the holder 40, in particular ring 41, bayonet hook 45 which as an additional attachment of the
• Holder 40 can also attack the motor housing 11. In this way, additional failure protection is created.
• the receiving plate 60 is designed as an approximately circular disk 61 which has passages 62 for the fastening members 70, in particular screws 73, which are aligned with the passages 42 of the holder 40.
• the receiving plate 60 is provided in the area of the passages 62 with eyes 63, which can be formed by the end face regions surrounding the passages 62. If the vibration damping element 50 fails, e.g. B. when tearing this, the otherwise free in normal function fuse elements 71 in
• the clear width of the passages 62 in the mounting plate 60 is selected to be at least as large as the diameter of the respective stop part 76 in the form of the
• the mounting plate 60 On the side facing away from the vibration damping element 50, the mounting plate 60, as parts of the fixing device for the handle 15 already mentioned, has a central bearing pin 64 and / or a turnstile 65, which is only indicated schematically, and which supports the pivotably adjustable fastening of the handle 15 to the mounting plate
• the vibration damping element 50 has sleeve sections 53 on the side facing the mounting plate 60, which are tubular and into the passages 62 extend into the receiving plate 60 and reach approximately up to the eyes 63, filling the passages 62.
• the sleeve sections 53 contain passages 54 which are aligned with the passages 42 of the holder 40 which are provided in the metal part 44 thereof.
• the vibration damping element 50 with the rib 51 axially adjacent to the holder 40 and on the other side to the mounting plate 60 covers the holder 40 and the part of the mounting plate 60 adjoining the vibration damping element 50 in the region of the respective one outer peripheral surface of the respective outer edge of the holder

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Percussion Or Vibration Massage (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=32049480

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (35)

Citations (1)

Family Cites Families (16)

• 2002
  • 2002-10-18 DE DE10248866.5A patent/DE10248866B4/de not_active Expired - Lifetime
• 2003
  • 2003-07-25 CN CNB038243679A patent/CN100464957C/zh not_active Expired - Lifetime
  • 2003-07-25 JP JP2004547377A patent/JP2006502875A/ja not_active Ceased
  • 2003-07-25 US US10/528,972 patent/US7204744B2/en not_active Expired - Lifetime
  • 2003-07-25 EP EP03809700A patent/EP1556189A1/de not_active Withdrawn
  • 2003-07-25 WO PCT/DE2003/002509 patent/WO2004039541A1/de active Application Filing

Patent Citations (1)

Non-Patent Citations (1)

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