EP4648927A1 - Handwerkzeugmaschine - Google Patents
HandwerkzeugmaschineInfo
- Publication number
- EP4648927A1 EP4648927A1 EP23818460.0A EP23818460A EP4648927A1 EP 4648927 A1 EP4648927 A1 EP 4648927A1 EP 23818460 A EP23818460 A EP 23818460A EP 4648927 A1 EP4648927 A1 EP 4648927A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sliding blocks
- inner housing
- elastic ring
- housing
- hand tool
- 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
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/06—Composite materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2222/00—Materials of the tool or the workpiece
- B25D2222/54—Plastics
- B25D2222/57—Elastomers, e.g. rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/121—Housing details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/331—Use of bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
- B25D2250/331—Use of bearings
- B25D2250/335—Supports therefor
Definitions
- the present invention relates to a hand-held power tool for at least partially axially impacting material processing, comprising an inner housing in which at least one impact mechanism is arranged, and an outer housing which at least partially surrounds the inner housing.
- a bearing is arranged between the inner housing and the outer housing.
- the field of application of the invention extends primarily to hand-held drilling or chisel hammers which are equipped with an electric motor drive.
- Such electric hand-held power tools generate a linear alternating working movement via a mechanical impact mechanism, i.e. a back and forth movement to act on the tool, which in the case of a chisel hammer is designed as a chisel and in the case of a hammer drill as an impact drill for machining preferably mineral materials - such as stone, concrete and the like.
- An electric hand-held power tool which can be driven by impact usually has a complex vibration behavior as a result of an interaction with the workpiece and the hand-arm system of the operator as well as the internal mass and stiffness distribution, which must be suppressed as far as possible.
- EP 0059 230 B1 discloses a self-lubricating elastic bearing for insertion between two elements rotating relative to one another.
- the bearing consists of an elastomer bearing bush with an inner surface with a low coefficient of friction, which interacts with the inner element or with an element firmly connected to it, and with an outer surface which is arranged in a bearing housing.
- the object underlying the invention is to provide a hand-held power tool with which vibrations can be reduced using simple technical means.
- the invention includes the technical teaching that the bearing comprises an elastic ring applied to the inner housing, in which a plurality of sliding blocks are embedded on an outer circumferential surface, which sliding blocks come into contact with the outer housing. Radial vibrations and shocks between the inner housing and the outer housing can thus be dampened by compressing the elastic ring.
- a sliding bearing is formed in a simple manner via the sliding blocks, via which an axial movement of the inner housing can be decoupled from the outer housing.
- the elastic material is advantageously an elastomer.
- the sliding blocks are made of a sintered material.
- the sliding blocks are manufactured by means of a sintering process.
- the sliding blocks can be manufactured in a simple technical manner using such a manufacturing process. After sintering, such a sliding block still has a certain porosity. This porosity Lubricants are stored in the pores and can be better provided by the sliding block, so that improved lubrication of the bearing is possible with a sliding block made of sintered material.
- the sliding blocks are made of a carbon fiber reinforced plastic.
- Components made of carbon fiber reinforced plastic are lighter than components made of metal. With such sliding blocks, a low weight can be achieved for a hand-held power tool, which improves the handling of such a hand-held power tool.
- holding means are arranged on an inner surface of the elastic ring, which interact with the sliding blocks so that the sliding blocks are held in the recesses of the elastic ring.
- Holding means are understood to be any configuration of the elastic ring or separate components that can be arranged that make it difficult to dismantle the sliding blocks after the sliding blocks have been installed. Such holding means ensure that the sliding blocks do not accidentally come loose from the elastic ring until the hand-held power tool has been fully assembled. This simplifies the assembly of the hand-held power tool.
- the sliding blocks have holding means which interact with the elastic ring after the sliding blocks have been mounted so that the sliding blocks are held in the recess of the elastic ring.
- the holding means are advantageously designed as locking lugs. Accordingly, the assembly of the hand-held power tool can also be simplified with holding means on the sliding blocks.
- the elastic ring advantageously forms sections that are offset radially from one another, with the sliding blocks that rest on the outer housing being arranged in radially outer sections, whereas the radially inner sections rest on the inner housing.
- the elastic ring has a meandering shape.
- a section is understood to be an area of the elastic ring that has the same outer or inner radius throughout.
- the radially inner sections have a smaller inner radius than the outer sections. Accordingly, the outer sections do not rest on the inner housing.
- the elastic ring provides a spring effect for the sliding block so that it rests against the outer housing in a spring-loaded manner. As a result, the inner housing is mounted on the outer housing by the bearing without play.
- the spring effect can also cushion radial vibrations or shocks.
- defined recesses are formed on the inner housing in the area below the sliding blocks, so that the sliding blocks are held resiliently between the inner housing and the outer housing via the elastic ring.
- the sliding blocks therefore do not rest on the inner housing, so that radial movement of the sliding blocks is possible.
- the bearing can also be mounted on the outer housing without play.
- the spring effect of the sliding blocks can thus decouple radial vibrations or shocks.
- recesses on the inner housing and the elastomer material the spring characteristic of the decoupling can be adjusted to the desired extent.
- the bearing is arranged in the area of a side handle attachment.
- a side handle attachment is a device by which a user can fix a side handle, after positioning, to the outer housing of the handheld power tool via a frictional connection.
- a retaining ring is often tightened onto the outer housing.
- Such a fixation often leads to a deformation of the outer housing.
- Such a deformation would lead to uneven storage in this area.
- Such a deformation can be compensated for by the spring effect of the sliding blocks according to the invention, so that despite a deformation of the outer housing, it can still be stored evenly in relation to the inner housing.
- the elastic ring is advantageously arranged in a pre-stressed state on the inner housing.
- the inner radius of the elastic ring is slightly smaller than the outer radius of the inner housing.
- the elastic ring is accordingly applied to the inner housing in a stretched state.
- This pre-stressed state ensures that with a radial deflection of the A sufficient spring effect can be achieved directly by means of the sliding blocks embedded in the elastic ring.
- the required spring force of the sliding blocks can also be set by means of a degree of pre-tension.
- the elastic material preferably has a hardness of 70-90 Shore A.
- a material with such a hardness has good damping values to dampen vibrations and shocks of a hand-held power tool.
- the elastic ring is arranged in a recess in the inner housing.
- the inner housing thus has a recess which is at least as wide as the elastic ring.
- the elastic ring is thus held in the corresponding position via the recess and cannot slip. This ensures that the elastic ring is permanently held in the predetermined position.
- Fig. 1 is a partial longitudinal section of a hand-held power tool with a bearing according to the invention
- FIG. 2 perspective view of a part of the inner housing with an embodiment of the bearing according to the invention
- FIG. 3a View of a sliding block according to an embodiment of the invention
- FIG. 3b perspective view of the sliding block according to Figure 3a
- FIG. 4 Section through a portion of the elastic ring in a state mounted on the inner housing
- Fig. 5a Side view of the elastic ring with sliding blocks according to an embodiment of the invention
- Fig. 5b perspective view of the elastic ring according to an embodiment of the invention.
- Fig. 5c enlarged view of an inner side of the elastic ring in the area of the breakthrough.
- Figure 1 shows a longitudinal section of a hand-held power tool 1 with a bearing 4 according to the invention.
- the hand-held power tool 1 has a percussion mechanism 8, via which an axial impact pulse can be transmitted to a percussion tool (not shown).
- the percussion mechanism 8 is arranged in an inner housing 12.
- the inner housing 12 is partially surrounded by an outer housing 16.
- the bearing 4, which supports an axial movement of the inner housing 12 to the outer housing 16, is arranged between the inner housing 12 and the outer housing 16.
- the inner housing 12 is decoupled from the outer housing 16 via the bearing 4.
- Figure 2 shows a perspective view of a part of the inner housing 12 with an embodiment of the bearing 4 according to the invention.
- the bearing 4 is formed from an elastic ring 20 which is applied to the inner housing 12.
- a plurality of sliding blocks 24 are arranged on the elastic ring 20 and protrude beyond the elastic ring 20 in a radial direction.
- the sliding blocks 24 rest against an inner side of the outer housing 16. A sliding axial movement of the inner housing 12 relative to the outer housing 16 is ensured via the sliding blocks 24.
- FIGS 3a and 3b show a view of a sliding block 24 according to an embodiment of the invention.
- the sliding block 24 is formed from a base body 28, which has a convex sliding surface 30.
- the sliding surface 30 rests against an inner side of the outer housing 16 in an assembled state.
- a The radius of the convex sliding surface 30 corresponds to an inner radius of the outer housing 16.
- the sliding block 24 has an extension 32 which extends from the base body 28 on a side facing away from the sliding surface 30.
- locking lugs 36 are arranged which, after assembly, interact with the elastic ring 20 so that the sliding block 24 is held on the ring 20.
- Figure 4 shows a section through a region of the elastic ring 20 in a state mounted on the inner housing 12.
- the elastic ring 20 has a recess 40 which partially accommodates the base body 28 of the sliding block 24 at a radial height. Accordingly, the recess 40 has the same shape as the sliding block 24.
- the elastic ring 20 also has an opening 44 into which the extension 32 of the sliding block 24 projects.
- the inner housing 12 has recesses 48 whose depth U is designed such that the sliding block 24 is held resiliently above the recess 48.
- FIG 5a shows a side view of the elastic ring 20 with sliding blocks 24 according to an embodiment of the invention.
- the elastic ring 20 in this figure has different outer and inner radii r a , n.
- the elastic ring 20 is divided into a plurality of sections 52 along the circumference.
- the sections 52 are arranged corresponding to the sliding blocks 24, with the sliding blocks 24 each arranged in outer sections 52a.
- Inner sections 52b are provided between the outer sections 52a, with the outer sections 52a having a larger inner radius n than the inner sections 52b.
- the elastic ring 20 only rests on the inner housing 12 via the inner sections 52b.
- FIG. 5b A perspective view of the elastic ring 20 according to an embodiment of the invention is shown in Figure 5b. For the sake of clarity, this figure is shown without sliding blocks 24. This figure essentially shows the features already shown in the previous figures.
- Figure 5c shows an enlarged view of an inner side of the elastic ring 20 in the area of the opening 44. In this
- elastic studs 64 are formed around the opening 44, by means of which the sliding block 24 is secured during assembly.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP23151323.5A EP4400266A1 (de) | 2023-01-12 | 2023-01-12 | Handwerkzeugmaschine |
| PCT/EP2023/084489 WO2024149528A1 (de) | 2023-01-12 | 2023-12-06 | Handwerkzeugmaschine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4648927A1 true EP4648927A1 (de) | 2025-11-19 |
Family
ID=84942877
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23151323.5A Withdrawn EP4400266A1 (de) | 2023-01-12 | 2023-01-12 | Handwerkzeugmaschine |
| EP23818460.0A Pending EP4648927A1 (de) | 2023-01-12 | 2023-12-06 | Handwerkzeugmaschine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23151323.5A Withdrawn EP4400266A1 (de) | 2023-01-12 | 2023-01-12 | Handwerkzeugmaschine |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20260208343A1 (de) |
| EP (2) | EP4400266A1 (de) |
| CN (1) | CN120152818A (de) |
| WO (1) | WO2024149528A1 (de) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1175470A (en) * | 1968-08-23 | 1969-12-23 | Ford Motor Co | Spring Loaded Bearing |
| DE3174449D1 (en) | 1981-03-02 | 1986-05-28 | Chromex Sa | Self-lubricating elastic bearing |
| US5033871A (en) * | 1988-10-25 | 1991-07-23 | Ide Russell D | Extrudable multi-rigidity hydrodynamic bearing and method of making the same |
| DE4000861C3 (de) * | 1990-01-13 | 1999-04-08 | Atlas Copco Electric Tools | Handgeführte Schlagbohrmaschine mit Schwingungsdämpfung |
| US5531524A (en) * | 1994-09-02 | 1996-07-02 | Kohler Co. | Self-adjusting bearing |
| TWM268144U (en) * | 2004-05-26 | 2005-06-21 | Chen Shiou Ru | Damping structure for pneumatic tool |
| FR2880394B1 (fr) * | 2005-01-06 | 2008-07-04 | Snecma Moteurs Sa | Organe de guidage d'une piece mobile |
| DE502005008000D1 (de) * | 2005-11-17 | 2009-10-08 | Metabowerke Gmbh | Schlagendes Elektrohandwerkzeuggerät |
| DE102006000253A1 (de) * | 2006-05-30 | 2007-12-06 | Hilti Ag | Schlagende Handwerkzeugmaschine mit axial beweglich gelagertem Schlagwerk |
| DE102010044011A1 (de) * | 2010-11-16 | 2012-05-16 | Hilti Aktiengesellschaft | Handwerkzeugmaschine |
-
2023
- 2023-01-12 EP EP23151323.5A patent/EP4400266A1/de not_active Withdrawn
- 2023-12-06 US US19/141,812 patent/US20260208343A1/en active Pending
- 2023-12-06 WO PCT/EP2023/084489 patent/WO2024149528A1/de not_active Ceased
- 2023-12-06 CN CN202380079641.8A patent/CN120152818A/zh active Pending
- 2023-12-06 EP EP23818460.0A patent/EP4648927A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20260208343A1 (en) | 2026-07-23 |
| WO2024149528A1 (de) | 2024-07-18 |
| CN120152818A (zh) | 2025-06-13 |
| EP4400266A1 (de) | 2024-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20250812 |
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| AK | Designated contracting states |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) | ||
| GRAP | Despatch of communication of intention to grant a patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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