US20120125648A1 - Hand-Held Power Tool, in Particular Electric Hand-Held Power Tool - Google Patents

Hand-Held Power Tool, in Particular Electric Hand-Held Power Tool Download PDF

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Publication number
US20120125648A1
US20120125648A1 US13/319,631 US201013319631A US2012125648A1 US 20120125648 A1 US20120125648 A1 US 20120125648A1 US 201013319631 A US201013319631 A US 201013319631A US 2012125648 A1 US2012125648 A1 US 2012125648A1
Authority
US
United States
Prior art keywords
power tool
hand
held power
handle part
spring element
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.)
Abandoned
Application number
US13/319,631
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English (en)
Inventor
Joachim Schadow
Joerg Maute
Manfred Lutz
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAUTE, JOERG, LUTZ, MANFRED, SCHADOW, JOACHIM
Publication of US20120125648A1 publication Critical patent/US20120125648A1/en
Abandoned 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
    • 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 relates to a hand-held power tool, in particular an electric hand-held power tool, according to the preamble of claim 1 .
  • an electric hand-held power tool which is embodied as an angle grinder and which has an electric drive motor in a motor housing.
  • a pot-shaped handle part is flange-mounted on the rear end face of the motor housing, wherein a damping ring is arranged between motor housing and handle part in order to dampen vibrations which emanate from the drive motor or occur during the machining of a workpiece.
  • the object of the invention is to achieve an effective reduction of vibrations in the handle part of a hand-held power tool with simple design measures.
  • the hand-held power tool according to the invention is preferably an electric hand-held power tool, the drive unit of which is designed as an electric drive motor which is arranged in a motor housing. Adjoining the motor housing is a handle part, via which the hand-held power tool is held and guided. A vibration reduction element which has the task of reducing vibrations in the handle part is located between the handle part and a further housing part—as a rule the motor housing.
  • the vibration reduction element is designed as a spring element which is arranged in a space between the handle part on the one side and the further housing part on the other side.
  • a spring element embodied as a separate component as vibration reduction element has the advantage that, firstly, the handle part is supported on the further housing part and, secondly, amplitudes and frequencies of the vibrations which emanate from the further housing part are shifted from critical to noncritical values, such that the objective and subjective vibration load in the handle part is reduced.
  • the spring element for example leaf springs, helical springs, disk springs, corrugated springs, diaphragm springs or the like.
  • the spring element is expediently connected, for example screwed, to at least one of the housing parts involved.
  • the force is transmitted in one or more axial directions, depending on where the spring element is fitted and on the type of spring element. Transmission of force between the handle part and the further housing part in the axial direction, that is to say in the direction of the longitudinal axis of the hand-held power tool, is possible in principle. In addition, support of the handle part in the radial direction and in the circumferential direction is also possible.
  • the handle part is of hollow-cylindrical or pot-shaped design and is pushed onto the further housing part, wherein an annular space is expediently formed between the lateral surface of the further housing part and the inner side of the handle part in order to avoid direct contact between the walls of the handle part and of the further housing part.
  • an annular space is expediently formed between the lateral surface of the further housing part and the inner side of the handle part in order to avoid direct contact between the walls of the handle part and of the further housing part.
  • a first spring element via which mainly forces in the axial direction are transmitted, is arranged in the region of the rear end face of the further housing part. At least one further spring element is located in the annular space between the lateral surface of the further housing part and the inner side of the handle part, support in the radial direction and if need be also in the circumferential direction being achieved via this further spring element.
  • a leaf spring element for example, is used in the region of the rear axial end face of the further housing part and the pot base; either a helical spring active in the radial direction or a corrugated spring element which extends either over the entire circumference or over a partial angular range in the circumferential direction can be used in the space between the outer lateral surface of the housing part and the inner side of the enclosing handle part.
  • a spring element which is preferably active in the axial direction can also be arranged on the free end face of the handle part, said spring element being supported on a step of the further housing part and extending likewise either over the entire circumference or only over a limited angular segment in the circumferential direction.
  • a damping element is arranged between the handle part and the housing part in addition to the at least one spring element, which damping element performs in particular the function of a sliding element and permits a relative movement between the handle part and the further housing part.
  • the sliding element performs a supporting function in the radial direction, the vibrations which emanate from the further housing part being reduced on account of the damping properties.
  • the relative movement between the handle part and the further housing part preferably takes place in the axial direction and/or in the circumferential direction, if need be also in the radial direction.
  • FIG. 1 shows a hand-held power tool comprising a multi-piece housing consisting of a motor housing for accommodating a drive motor and a handle part which is of pot-shaped design and is pushed onto the motor housing, wherein a vibration reduction element embodied as a spring element is arranged in an annular space between the lateral surface of the motor housing and the inner side of the handle part, and comprising an additional damping element which is arranged adjacent to the free axial end face of the handle part,
  • a vibration reduction element embodied as a spring element
  • FIG. 2 shows a further exemplary embodiment, comprising a leaf spring between the base of the pot-shaped handle part and the axial rear end face of the motor housing, and comprising a second spring element in the annular space, said second spring element extending in the circumferential direction,
  • FIG. 3 shows the spring element from FIG. 2 arranged in the annular space, in a sectional illustration
  • FIG. 4 shows a further exemplary embodiment comprising a leaf spring element between the base of the handle part and the rear axial end face of the motor housing and comprising a sliding element in the annular space between motor housing and handle part,
  • FIG. 5 shows a further exemplary embodiment comprising a spring element between the free axial end face of the handle part and comprising a step on the motor housing,
  • FIG. 6 shows a further exemplary embodiment comprising a spring element designed as a corrugated spring in the annular space between motor housing and handle part.
  • the electric hand-held power tool 1 shown in FIG. 1 has a two-piece housing 5 , consisting of a motor housing 2 with an electric drive motor 3 arranged therein and a handle part 4 which is of pot-shaped design and is pushed onto the motor housing 2 .
  • the inside diameter of the handle part 4 is greater than the outside diameter of the motor housing 2 , as a result of which an annular space is formed between the lateral surface of the motor housing 2 and the inner side of the handle part 4 .
  • the base 4 a of the handle part 4 is also at an axial distance from the rear axial end face 2 a of the motor housing 2 . In this way, direct contact between the motor housing 2 and the handle part 4 is to be avoided in order to ensure that vibrations can spread from the motor housing 2 to the handle part 4 only in a reduced manner.
  • the handle part 4 is supported on the motor housing 2 via a spring element 6 which is arranged in the annular space between motor housing 2 and handle part 4 .
  • the spring element 6 is designed as a helical spring or if need be also as a corrugated spring and extends in the radial direction, with respect to the longitudinal axis 8 of the hand-held power tool 1 .
  • the spring element 6 supports the handle part 4 on the motor housing 2 in the radial direction. If need be, the spring element 6 also additionally acts in the circumferential direction and therefore holds the handle part 4 in a desired angular position with respect to the motor housing 2 .
  • the spring element 6 is located close to the free end face of the pot-shaped handle part 4 .
  • recesses into which the spring element 6 is inserted are incorporated in the lateral surface of the motor housing 2 and on the inner side of the handle part 4 .
  • a plurality of such spring elements can be distributed over the axial length and if need be also over the circumference in order to accordingly support the handle part 4 on the motor housing 2 over the axial length thereof and over the circumference.
  • the handle part 4 is supported with the inner side thereof on a sliding element 7 which is put onto the lateral surface of the motor housing 2 or is fastened there.
  • the sliding element 7 permits a movement of the handle part 4 relative to the motor housing 2 , specifically in both the axial direction and the circumferential direction and if need be also in the radial direction.
  • the sliding element 7 also performs the function of a damping element and accordingly consists of a damping material in order to ensure that vibrations of the motor housing are transmitted only in a reduced manner when the handle part 4 is in position.
  • the sliding element 7 is an optional component, which if need be can also be dispensed with.
  • a spring element 6 is located in the annular space between the lateral surface of the motor housing 2 and the inner side of the handle part 4 , but this spring element 6 , as can also be seen from the sectional illustration according to FIG. 3 , is embodied as a corrugated leaf spring.
  • the spring element 6 extends in the circumferential direction, suitable embodiments being both those having a leaf spring which extends only over a limited angular segment and those having an annular leaf spring in which the spring element extends over the entire circumference.
  • a plurality of spring peaks and spring valleys respectively bear in a distributed manner over the circumference against the inner side of the handle part 4 and respectively against the lateral surface of the motor housing 2 .
  • a sliding element 7 is located adjacent to the free end face of the handle part 4 on the lateral surface of the motor housing 2 , said sliding element 7 supporting the inner side of the handle part 4 .
  • This sliding element 7 is also optionally present and can be omitted if need be.
  • a further spring element 9 which is designed as a leaf spring and is fixedly connected to the rear end face of the motor housing 2 via a screw 10 .
  • the spring element 9 is also connected to the inner side of the base 4 a of the handle part 4 via a further screw 11 .
  • the spring element 9 primarily acts axially in the direction of the longitudinal axis 8 , but also acts in the radial direction and circumferential direction.
  • the spring element 6 in the annular space is inserted into recesses in the lateral surface of the motor housing 2 and on the inner side of the handle part 4 and is thereby fixed in the axial direction.
  • a spring element 9 designed as a leaf spring is located in the axial intermediate region between the inner side of the base 4 a of the handle part 4 and the rear axial end face of the motor housing 2 .
  • the spring element 9 is axially connected to the motor housing 2 via the screw 10 .
  • the spring element 9 In its radially outer region, the spring element 9 has a bent-over section, via which the spring element is connected to the radial inner side of the handle part 4 via a further screw 11 .
  • the connection is therefore effected in the region of the annular space between the motor housing 2 and the inner side of the handle part 4 .
  • the connection can also be carried out via other connecting measures, for example via a snap connection, by adhesive bonding, ultrasonic welding, etc.
  • the sliding element 7 which is arranged adjacent to the free end face of the handle part 4 on the lateral surface of the motor housing 2 , can be dimensioned in such a way that, in a desired position, the inner side of the handle part 4 is at a distance from the sliding element 7 , such that the sliding element 7 comes into contact with the inner side of the handle part 4 only during a radial deflection from the desired position.
  • an expediently circumferential spring element 6 extending in the axial direction is arranged between the free axial end face of the handle part 4 and the motor housing 2 , said spring element 6 being embodied, for example, as a bellows or as a corrugated spring.
  • the spring element 6 is held at its axial end faces on fastening parts 12 and 13 , of which the fastening part 12 projects into an accommodating pocket 14 which is formed on the motor housing 2 or is fastened to the latter, whereas the second fastening part 13 is connected to the end face of the handle part 4 .
  • the spring element is located in the annular space between the outer lateral surface of the motor housing 2 and the inner side of the handle part 4 .
  • the spring element 6 can be formed over the circumference or if need be can also extend in the circumferential direction only over a limited angular segment, where in the latter case a plurality of spring elements can in principle be arranged in the annular space in a distributed manner over the circumference.
  • the spring element 6 is designed as a corrugated spring and transmits forces in both the axial direction and the circumferential direction and in the radial direction.
  • the spring element 6 is connected via fastening parts 15 and 16 both to the inner side of the handle part 4 and to the lateral surface of the motor housing 2 .
  • the fastening parts 15 , 16 can each be part of a bayonet catch in order to enable the spring element 6 to be changed in a simple manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
US13/319,631 2009-05-11 2010-04-12 Hand-Held Power Tool, in Particular Electric Hand-Held Power Tool Abandoned US20120125648A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009002975.3 2009-05-11
DE102009002975A DE102009002975A1 (de) 2009-05-11 2009-05-11 Handwerkzeugmaschine, insbesondere Elektrohandwerkzeugmaschine
PCT/EP2010/054740 WO2010130512A1 (de) 2009-05-11 2010-04-12 Handwerkzeugmaschine, insbesondere elektrohandwerkzeugmaschine

Publications (1)

Publication Number Publication Date
US20120125648A1 true US20120125648A1 (en) 2012-05-24

Family

ID=42357389

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/319,631 Abandoned US20120125648A1 (en) 2009-05-11 2010-04-12 Hand-Held Power Tool, in Particular Electric Hand-Held Power Tool

Country Status (5)

Country Link
US (1) US20120125648A1 (de)
EP (1) EP2429770B1 (de)
CN (1) CN102421567A (de)
DE (1) DE102009002975A1 (de)
WO (1) WO2010130512A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140061278A1 (en) * 2012-09-06 2014-03-06 Sabic Innovative Plastics Ip B.V. Surgical stapler with corrugated thermoplastic leaf spring
CN109202820A (zh) * 2017-06-29 2019-01-15 苏州宝时得电动工具有限公司 动力工具
JP2019013985A (ja) * 2017-07-03 2019-01-31 株式会社マキタ 電動工具
US10569406B2 (en) * 2016-02-19 2020-02-25 Makita Corporation Work tool
US10661426B2 (en) * 2016-02-19 2020-05-26 Makita Corporation Work tool with vibration dampers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105881463B (zh) * 2015-02-15 2021-08-10 苏州宝时得电动工具有限公司 动力工具

Citations (12)

* Cited by examiner, † Cited by third party
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US1290180A (en) * 1916-04-10 1919-01-07 North East Electric Co Spacer.
US2019964A (en) * 1933-02-20 1935-11-05 Independent Pneumatic Tool Co Cushion means for tools
US2500036A (en) * 1945-12-22 1950-03-07 Cleveland Pneumatic Tool Co Cushioned handle for portable percussive tools
US4237987A (en) * 1978-10-27 1980-12-09 Sherman Victor L Percussive tool
US5052500A (en) * 1988-04-30 1991-10-01 Hitachi Koki Company, Limited Vibroisolating handle joint structure for power tool
US5322131A (en) * 1993-05-20 1994-06-21 Chicago Pneumatic Tool Company Vibration-reduced pneumatic tool
US5927407A (en) * 1993-01-27 1999-07-27 Lord Corporation Isolated hand-held vibrating device
US20070034396A1 (en) * 2003-07-15 2007-02-15 Rudolf Berger Working tool with damped handle
US20070295522A1 (en) * 2006-06-16 2007-12-27 Ulrich Bohne Hand power tool
US20070295521A1 (en) * 2006-06-16 2007-12-27 Juergen Wiker Hand power tool
US20080202784A1 (en) * 2005-04-11 2008-08-28 Peter Stierle Hand-Held Power Tool
US7721818B2 (en) * 2004-10-29 2010-05-25 Hitachi Koki Co., Ltd. Power tool having a vibration isolating handle

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CS149009B1 (de) * 1971-02-01 1973-05-24
DE4000861C3 (de) * 1990-01-13 1999-04-08 Atlas Copco Electric Tools Handgeführte Schlagbohrmaschine mit Schwingungsdämpfung
JPH0825249A (ja) * 1994-07-12 1996-01-30 Makita Corp 振動工具及び防振リング
DE10332109B4 (de) * 2003-07-15 2009-01-15 Wacker Construction Equipment Ag Arbeitsgerät mit Handgriffabfederung
DE10332522A1 (de) * 2003-07-17 2005-02-17 Robert Bosch Gmbh Handwerkzeugmaschine mit vibrationsisoliertem Handgriff und Regelung zur Vibrationsisolierung
DE10340178B3 (de) * 2003-09-01 2005-04-07 Hilti Ag Elektrowerkzeug
DE102005047353A1 (de) * 2005-10-04 2007-04-05 Robert Bosch Gmbh Elektrowerkzeugmaschine
CN101282822B (zh) * 2005-10-29 2010-05-12 Aeg电动工具有限公司 手持式工具机
JP4626574B2 (ja) * 2006-06-16 2011-02-09 日立工機株式会社 電動工具
DE102007042721A1 (de) * 2007-09-07 2009-03-12 Robert Bosch Gmbh Handwerkzeugmaschine mit einem durch ein Ausgleichsmittel schwingungsgedämpften Handgriff

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1290180A (en) * 1916-04-10 1919-01-07 North East Electric Co Spacer.
US2019964A (en) * 1933-02-20 1935-11-05 Independent Pneumatic Tool Co Cushion means for tools
US2500036A (en) * 1945-12-22 1950-03-07 Cleveland Pneumatic Tool Co Cushioned handle for portable percussive tools
US4237987A (en) * 1978-10-27 1980-12-09 Sherman Victor L Percussive tool
US5052500A (en) * 1988-04-30 1991-10-01 Hitachi Koki Company, Limited Vibroisolating handle joint structure for power tool
US5927407A (en) * 1993-01-27 1999-07-27 Lord Corporation Isolated hand-held vibrating device
US5322131A (en) * 1993-05-20 1994-06-21 Chicago Pneumatic Tool Company Vibration-reduced pneumatic tool
US20070034396A1 (en) * 2003-07-15 2007-02-15 Rudolf Berger Working tool with damped handle
US7721818B2 (en) * 2004-10-29 2010-05-25 Hitachi Koki Co., Ltd. Power tool having a vibration isolating handle
US20080202784A1 (en) * 2005-04-11 2008-08-28 Peter Stierle Hand-Held Power Tool
US20070295522A1 (en) * 2006-06-16 2007-12-27 Ulrich Bohne Hand power tool
US20070295521A1 (en) * 2006-06-16 2007-12-27 Juergen Wiker Hand power tool

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140061278A1 (en) * 2012-09-06 2014-03-06 Sabic Innovative Plastics Ip B.V. Surgical stapler with corrugated thermoplastic leaf spring
US9265501B2 (en) * 2012-09-06 2016-02-23 Sabic Global Technologies B.V. Surgical stapler with corrugated thermoplastic leaf spring
US10569406B2 (en) * 2016-02-19 2020-02-25 Makita Corporation Work tool
US10661426B2 (en) * 2016-02-19 2020-05-26 Makita Corporation Work tool with vibration dampers
US11478917B2 (en) * 2016-02-19 2022-10-25 Makita Corporation Work tool with vibration dampers
CN109202820A (zh) * 2017-06-29 2019-01-15 苏州宝时得电动工具有限公司 动力工具
JP2019013985A (ja) * 2017-07-03 2019-01-31 株式会社マキタ 電動工具

Also Published As

Publication number Publication date
EP2429770A1 (de) 2012-03-21
EP2429770B1 (de) 2016-03-30
CN102421567A (zh) 2012-04-18
WO2010130512A1 (de) 2010-11-18
DE102009002975A1 (de) 2010-11-18

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Legal Events

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AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHADOW, JOACHIM;MAUTE, JOERG;LUTZ, MANFRED;SIGNING DATES FROM 20120112 TO 20120113;REEL/FRAME:027662/0483

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION