US20080245220A1 - Percussion Mechanism and at Least Percussively-Operated Hand Machine Tool With a Percussion Mechanism - Google Patents

Percussion Mechanism and at Least Percussively-Operated Hand Machine Tool With a Percussion Mechanism Download PDF

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Publication number
US20080245220A1
US20080245220A1 US11/575,994 US57599406A US2008245220A1 US 20080245220 A1 US20080245220 A1 US 20080245220A1 US 57599406 A US57599406 A US 57599406A US 2008245220 A1 US2008245220 A1 US 2008245220A1
Authority
US
United States
Prior art keywords
percussion
tool
percussion mechanism
bolt
percussively
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
US11/575,994
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English (en)
Inventor
Achim Duesselberg
Andre Ullrich
Kurt Sieber
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: SIEBER, KURT, ULLRICH, ANDRE, DUESSELBERG, ACHIM
Publication of US20080245220A1 publication Critical patent/US20080245220A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
    • 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
    • B25D2222/21—Metals
    • B25D2222/42—Steel
    • 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
    • B25D2250/191—Ram catchers for stopping the ram when entering idling mode
    • 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
    • B25D2250/365—Use of seals

Definitions

  • a percussion mechanism of percussively drivable hand power tools in order to transmit a percussion pulse, often includes a so-called header or percussion bolt, which is axially displaceably supported in a percussion bolt guide and is acted upon on the drive end with blows by a beater of the percussion mechanism in the drilling or percussion direction.
  • the percussion energy of the blows is transmitted by the percussion bolt to a face end on the drive end of the tool that is received in the tool holder.
  • a lubricant-filled interior of the percussively drivable hand power tool is thus sealed off from the outside.
  • the percussion bolt typically made from steel, is guided in hard fashion in the tool holder, or in a steel hammer barrel that adjoins the tool holder on the drive end.
  • This version comprises a great number of individual parts, whose manufacture requires precise machining.
  • certain minimum tolerances cannot be allowed to be exceeded, so as to keep the components in the percussion line and thus assure only slight transverse forces.
  • the proposed steel version is thus quite cost-intensive.
  • the body is embodied in two parts, with a drive part of the body comprising the elastomer material and a tool part of the body comprising steel.
  • the two parts have a continuous axial recess for the percussion bolt, and the percussion bolt is limitedly axially displaceable in the recess between an idling position and a percussion position.
  • the thus-shaped parts of the body have a guide function for the percussion bolt.
  • the tool part of the body may have an inner idling impact stop shoulder, against which the percussion bolt rests in the idling mode.
  • the drive part of the body preferably has a B-impact stop shoulder, which damps the recoil of the percussion bolt after the transfer of the percussion pulse to the tool. Because of the embodiment according to the invention of the drive part of the body of elastomer, the deceleration of the percussion bolt in its reverse motion in the percussion mode is damped.
  • a sealing element can be located on an on an inner and/or outer jacket face of the drive part of the body. As a result, even better sealing action can favorably be attained, especially against the entry of dirt from outside.
  • the sealing element preferably annularly surrounds the percussion bolt.
  • the drive part of the body may be shaped such that besides guiding the percussion bolt, it performs one or more other functions, such as a sealing function and/or an idling function in idling impact or B-impact, in order to damp the recoil that then occurs and to brace the drill in the device.
  • a beater catch ring may be integrated with the drive part of the body, in order to catch the beater in the idling mode.
  • a separate beater catch ring may be provided instead of the beater catch ring integrated with the drive part of the body.
  • a standard sealing ring may for instance be used, thus simplifying the tool construction.
  • FIG. 1 is a fragmentary longitudinal section through an at least percussively drivable hand power tool with a percussion bolt group;
  • FIGS. 2 a, b show an enlarged view of a drive part ( FIG. 2 a ) and a tool part ( FIG. 2 b ) of the percussion bolt guide.
  • FIG. 1 part of an electric hand power drill or percussion hammer with a percussion mechanism is shown in longitudinal section.
  • the percussion mechanism essentially includes a percussion bolt guide 11 and a percussion bolt 12 , which is axially displaceable in the percussion bolt guide 11 and which transmits the percussion pulse of a beater 20 of the percussion mechanism, which is driven by a drive motor, not shown, of the handheld drill hammer or percussion hammer, to a drilling or percussion tool 19 inserted into a tool holder 10 of the percussion mechanism.
  • the percussion bolt 12 is made from solid steel and comprises two elongated cylindrical end parts 21 a , 21 b , as well as a radially thickened middle part 22 that connects the two end parts 21 a , 21 b and is located between them.
  • the percussion bolt guide 11 extends over the entire length of the percussion bolt 12 and includes a hammer barrel 23 , which is braced in the axial direction in a housing 24 of the drill hammer or percussion hammer.
  • a body 13 is fixed in the hammer barrel 23 .
  • the hammer barrel 23 comprises two tubular portions 23 ′, 23 ′′, joined by a conical annular shoulder 32 , and of these the front tubular portion 23 ′′, toward the tool, has a smaller diameter and forms the tool holder 10 .
  • the rear tubular portion 23 ′ has a larger diameter and is open at its rear face end, so that the body 13 , the percussion bolt 12 , the beater 20 , and a piston 25 of the percussion mechanism acting on the beater 20 can be introduced into the hammer barrel 23 from this end.
  • an air cushion chamber 26 is embodied in the hammer barrel 23 ; it can be ventilated via radial air bores (not shown) in the wall of the hammer barrel 23 .
  • the body 13 held by the hammer barrel 23 is embodied with an annular cross section and is formed of two materials of different hardness.
  • the body 13 is embodied in two parts, with a drive part 14 and a tool part 15 .
  • the drive part 14 of the body 13 is formed of an elastomer, and the tool part 14 of the body 13 is of steel.
  • the drive part 14 of the body 13 has a greater axial length than the tool part 15 .
  • the two parts 14 , 15 have a continuous axial recess 27 for the percussion bolt
  • the drive part 14 has a B-impact stop shoulder 17 on the drive end, and this shoulder damps the recoil of the percussion bolt 12 after the transfer of the percussion pulse to the tool 19 .
  • the tool part 15 of the body 13 has an inner idling stop shoulder 16 toward the tool, against which shoulder the percussion bolt 12 rests in the idling mode.
  • the percussion bolt 12 is limitedly axially displaceable between an idling position and a percussion position.
  • the parts 14 , 15 thus serve as a guide for the percussion bolt 12 .
  • FIG. 2 a a detail of the drive part 14 of the body 13 , with the B-impact stop shoulder 17 , is shown, and in FIG. 2 b , a detail of the tool part 15 of the body 13 , with the idling stop shoulder 16 , is shown.
  • the parts 14 , 15 each form a recess 27 , in which the percussion bolt 12 , not shown here, is axially displaceable.
  • a beater catch ring 18 is integrated with the drive part 14 of the body 13 , in order to catch the beater 20 in the idling mode.
  • the beater catch ring 18 is located on the drive end, and on its free end, which is on the drive end in the installed state, it is thickened in beadlike fashion.
  • the beater catch ring 18 is embodied as protruding axially.
  • An inside diameter of the beater catch ring 18 is smaller than an outside diameter of a thickened face end 30 of the beater 20 toward the tool and shown in FIG. 1 .
  • the beater catch ring is joined to the part 14 via a hollow-cylindrical neck part 28 .
  • the neck part 28 has an inside diameter that is widened compared to the inside diameter of the beater catch ring 18 .
  • the drive part 14 of the body 13 is shaped such that besides guiding the percussion bolt 12 and having the beater catching function, it performs still other functions, such as a sealing function and/or a damping function in idling impact or B-impact, in order to damp the resultant recoil and brace the drill in the device.
  • This can be attained for instance by means of a plurality of encompassing grooves 31 , which are located on the end toward the tool of the drive part 14 in the installed state.
  • the tool part 15 of the body 13 is shaped like a steel sleeve, and toward the tool it includes the inner idling stop shoulder 16 .
  • An outer face 33 of the part 15 tapers toward the tool in a shape embodied as complementary to the annular shoulder 32 of the hammer barrel 23 .
  • the outer face 33 of the part 15 can thus be braced on the annular shoulder 32 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)
US11/575,994 2005-07-27 2006-06-22 Percussion Mechanism and at Least Percussively-Operated Hand Machine Tool With a Percussion Mechanism Abandoned US20080245220A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005035099.2 2005-07-27
DE102005035099A DE102005035099A1 (de) 2005-07-27 2005-07-27 Schlagwerk und wenigstens schlagend antreibbare Handwerkzeugmaschine mit einem Schlagwerk
PCT/EP2006/063468 WO2007012527A1 (fr) 2005-07-27 2006-06-22 Mecanisme de percussion et machine-outil portative a commande au moins par percussion, munie d'un mecanisme de percussion

Publications (1)

Publication Number Publication Date
US20080245220A1 true US20080245220A1 (en) 2008-10-09

Family

ID=36930392

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/575,994 Abandoned US20080245220A1 (en) 2005-07-27 2006-06-22 Percussion Mechanism and at Least Percussively-Operated Hand Machine Tool With a Percussion Mechanism

Country Status (7)

Country Link
US (1) US20080245220A1 (fr)
EP (1) EP1910039B1 (fr)
CN (1) CN101228008A (fr)
AT (1) ATE486695T1 (fr)
DE (2) DE102005035099A1 (fr)
ES (1) ES2354626T3 (fr)
WO (1) WO2007012527A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100326688A1 (en) * 2008-02-20 2010-12-30 Andre Ullrich Handheld power tool
US10391621B2 (en) 2013-12-18 2019-08-27 Hilti Aktiengesellschaft Handheld power tool
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
US10926393B2 (en) 2018-01-26 2021-02-23 Milwaukee Electric Tool Corporation Percussion tool
US20220362916A1 (en) * 2019-11-15 2022-11-17 Hilti Aktiengesellschaft Impact mechanism arrangement
US20230071871A1 (en) * 2019-10-21 2023-03-09 Makita Corporation Power tool having hammer mechanism
US20240123589A1 (en) * 2019-11-12 2024-04-18 Hilti Aktiengesellschaft Impact mechanism arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040118A1 (de) * 2008-07-03 2010-01-07 Robert Bosch Gmbh Bohr- und/oder Meißelhammer
DE102009045656A1 (de) 2009-10-14 2011-04-21 Robert Bosch Gmbh Werkzeugvorrichtung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310055A (en) * 1978-10-10 1982-01-12 Robert Bosch Gmbh Percussion hammer with a one piece striker
US4325436A (en) * 1980-05-21 1982-04-20 Hilti Aktiengesellschaft Hammer drill or chipping hammer device
US4582144A (en) * 1984-04-25 1986-04-15 Makita Electric Works, Ltd. Percussive tools
US5099926A (en) * 1990-04-05 1992-03-31 Makita Corporation Impact tool
US5111890A (en) * 1988-08-02 1992-05-12 Robert Bosch Gmbh Hammer drill
US5873418A (en) * 1996-03-29 1999-02-23 Makita Corporation Percussive tool having a reduced impact at the start of percussive operation
US20020125023A1 (en) * 2001-03-07 2002-09-12 Andreas Hanke Hammer
US6913089B2 (en) * 2002-06-12 2005-07-05 Black & Decker Inc. Hammer
US7331408B2 (en) * 2004-12-23 2008-02-19 Black & Decker Inc. Power tool housing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2207962C3 (de) * 1972-02-21 1980-07-10 Robert Bosch Gmbh, 7000 Stuttgart Luftfederhammer
GB2401570B (en) * 2003-05-12 2006-07-05 Black & Decker Inc Spindle assembly for hammer drill
DE10323606B4 (de) * 2003-05-20 2005-04-14 Robert Bosch Gmbh Elastische Döpperführung

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4310055A (en) * 1978-10-10 1982-01-12 Robert Bosch Gmbh Percussion hammer with a one piece striker
US4325436A (en) * 1980-05-21 1982-04-20 Hilti Aktiengesellschaft Hammer drill or chipping hammer device
US4582144A (en) * 1984-04-25 1986-04-15 Makita Electric Works, Ltd. Percussive tools
US5111890A (en) * 1988-08-02 1992-05-12 Robert Bosch Gmbh Hammer drill
US5099926A (en) * 1990-04-05 1992-03-31 Makita Corporation Impact tool
US5873418A (en) * 1996-03-29 1999-02-23 Makita Corporation Percussive tool having a reduced impact at the start of percussive operation
US20020125023A1 (en) * 2001-03-07 2002-09-12 Andreas Hanke Hammer
US6732815B2 (en) * 2001-03-07 2004-05-11 Black & Decker, Inc. Hammer
US6913089B2 (en) * 2002-06-12 2005-07-05 Black & Decker Inc. Hammer
US7331408B2 (en) * 2004-12-23 2008-02-19 Black & Decker Inc. Power tool housing

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100326688A1 (en) * 2008-02-20 2010-12-30 Andre Ullrich Handheld power tool
US8272453B2 (en) * 2008-02-20 2012-09-25 Robert Bosch Gmbh Handheld power tool
US10391621B2 (en) 2013-12-18 2019-08-27 Hilti Aktiengesellschaft Handheld power tool
US10814468B2 (en) 2017-10-20 2020-10-27 Milwaukee Electric Tool Corporation Percussion tool
US11633843B2 (en) 2017-10-20 2023-04-25 Milwaukee Electric Tool Corporation Percussion tool
US11141850B2 (en) 2018-01-26 2021-10-12 Milwaukee Electric Tool Corporation Percussion tool
US11059155B2 (en) 2018-01-26 2021-07-13 Milwaukee Electric Tool Corporation Percussion tool
US11203105B2 (en) 2018-01-26 2021-12-21 Milwaukee Electric Tool Corporation Percussion tool
US10926393B2 (en) 2018-01-26 2021-02-23 Milwaukee Electric Tool Corporation Percussion tool
US11759935B2 (en) 2018-01-26 2023-09-19 Milwaukee Electric Tool Corporation Percussion tool
US11865687B2 (en) 2018-01-26 2024-01-09 Milwaukee Electric Tool Corporation Percussion tool
US20230071871A1 (en) * 2019-10-21 2023-03-09 Makita Corporation Power tool having hammer mechanism
US20240123589A1 (en) * 2019-11-12 2024-04-18 Hilti Aktiengesellschaft Impact mechanism arrangement
US20220362916A1 (en) * 2019-11-15 2022-11-17 Hilti Aktiengesellschaft Impact mechanism arrangement
US12115637B2 (en) * 2019-11-15 2024-10-15 Hilti Aktiengesellschaft Impact mechanism arrangement

Also Published As

Publication number Publication date
WO2007012527A1 (fr) 2007-02-01
DE102005035099A1 (de) 2007-02-01
CN101228008A (zh) 2008-07-23
ATE486695T1 (de) 2010-11-15
EP1910039A1 (fr) 2008-04-16
EP1910039B1 (fr) 2010-11-03
DE502006008238D1 (de) 2010-12-16
ES2354626T3 (es) 2011-03-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DUESSELBERG, ACHIM;ULLRICH, ANDRE;SIEBER, KURT;REEL/FRAME:019062/0652;SIGNING DATES FROM 20070313 TO 20070319

STCB Information on status: application discontinuation

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