EP2029326A1 - Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté - Google Patents

Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté

Info

Publication number
EP2029326A1
EP2029326A1 EP07728284A EP07728284A EP2029326A1 EP 2029326 A1 EP2029326 A1 EP 2029326A1 EP 07728284 A EP07728284 A EP 07728284A EP 07728284 A EP07728284 A EP 07728284A EP 2029326 A1 EP2029326 A1 EP 2029326A1
Authority
EP
European Patent Office
Prior art keywords
firing pin
mechanism according
ring
damping device
damping
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.)
Withdrawn
Application number
EP07728284A
Other languages
German (de)
English (en)
Inventor
Willy Braun
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
Publication of EP2029326A1 publication Critical patent/EP2029326A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
    • 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
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
    • 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

Definitions

  • the invention relates to a striking mechanism of a machine tool, in particular a hand tool, with a firing pin, which has a region of maximum diameter and which is associated with at least one catching device.
  • the hammer mechanism has to transmit a shock pulse to a tool on an axially slidably mounted firing pin (also known as an anvil), the drive side is acted upon by a bat of the percussion in the direction of impact with blows.
  • the firing pin is associated with a safety gear.
  • the safety device can fix the firing pin, for example, in a position on the tool-side end of the impact mechanism-the so-called neutral position.
  • the safety gear acts on an area of maximum diameter (major diameter) of the firing pin.
  • this arrangement of the safety gear limits the size of the firing pin, since the radial extent of the firing pin is limited at its major diameter by the safety gear. Therefore, with such a catch arranged only firing pin can be realized with relatively small mass. Disclosure of the invention
  • the safety device acts on a portion of the firing pin, which has a smaller diameter than the range.
  • Such sections are already present in many types of firing pin. These firing bolts are located next to the area with the maximum
  • Diameter at least one section with a smaller diameter.
  • a transition region between the region and the section has a shoulder, with which a working position of the firing pin is specified for a beating operation.
  • the safety device releasably fixes the firing pin in an idle position.
  • the firing pin is arranged on the longitudinal axis of the impact mechanism between a racket and a tool, wherein the racket is driven by a piston via an air cushion.
  • the opening and closing of the idling openings is controlled by the firing pin and / or the racket.
  • the open idle openings is assigned a tool-side position of the firing pin. This position is the neutral position of the firing pin. This position also allows the racket to assume a tool-side position.
  • the racket does not obscure the idling openings when they are idle, and these are "open."
  • the idling openings may also be controlled by an idler sleeve from the striker or racket To stop the firing pin after the displacement in the idle position and an uncontrolled
  • the firing pin in this section has a structure to which the safety gear can attack.
  • the safety gear is a catching device radially surrounding the portion of the firing pin.
  • the section has a radial groove and / or a radial projection, in particular a ring strip, for positive engagement.
  • This radial groove or this radial projection can, for example, with a structure of the safety gear in the back grip.
  • the radial groove is a radially (circumferentially) extending groove and the radial projection is a projection extending in an axial portion, wherein a plurality of radial projections may be circumferentially arranged in an axial section.
  • the ring strip is a circumferentially radially extending strip-like structure.
  • the safety gear is designed as a catching ring.
  • a flexible ring can with the radial projection of the section in positive engagement and / or frictional engagement and fix the firing pin so in the desired position (for example, the idle position). At a position of the firing pin, which does not correspond to this position to be fixed, the firing pin can be moved through the catch ring without interacting with this.
  • Catching ring can, for example einschnappen in a suitable ausgestaltet annular groove or a projection in the section of the firing pin and releasably fix the firing pin in a corresponding position.
  • the safety gear consists essentially of elastomeric material.
  • the impact mechanism has at least one damping device for damping the firing pin movement in an end position, wherein the safety gear is integrated in the damping device.
  • the damping device may be formed, for example, as an annular damping shoulder, in the damping material, the safety gear is embedded.
  • the damping device is designed as a B impact-damping device or idle damping device.
  • the idle damping device is located on the tool-side end of the firing pin guide and ensures that the firing pin is as much attenuated and not reflected in this end stop.
  • the B impact damping device (kickback damping device) of the firing pin is mounted on the rack end of the firing pin guide damping device, the The firing pin reflected back from the tool dampens in the working position, so that it is not reflected and remains in the working position. Both damping devices act on one shoulder of the firing pin, each in a transition region between the area with the
  • Main diameter maximum diameter and at least one section with a smaller diameter is located.
  • the damping device has the safety gear, in particular by forming an annular inner shoulder.
  • the safety gear is part of the damping device.
  • the elastic material for damping the impact of the firing pin is annularly formed as an inner shoulder at at least one point, so that the task of elastic catching ring takes over.
  • the damping device has a damping ring, which forms the catching ring.
  • the firing pin has at least one radially projecting, elastic projection which can engage in a catching position in a recess of the firing pin guide.
  • a complementary catching device prevents in particular in one of the end positions of the firing pin additionally bouncing back of the firing pin.
  • the elastic projection may for example be formed by an O-ring which rests in an annular groove of the firing pin. This O-ring can serve as a sealing ring for sealing the striking mechanism.
  • Figure 1 is a not inventive impact mechanism with a
  • FIGS. 2A and 2B show an impact mechanism according to the invention
  • FIGS. 3A and 3B show an impact mechanism according to the invention
  • FIGS. 4A and 4B show an impact mechanism according to the invention
  • FIGS. 5A and 5B show an impact mechanism according to the invention with a firing pin and associated safety gear according to a fourth exemplary embodiment.
  • FIG. 1 shows a striking mechanism 1 of a machine tool not according to the invention.
  • the hammer mechanism 1 not according to the invention is to be described below only to the extent that the embodiments of the hammer mechanism 1 according to the invention are shown in FIGS. 2A to 5B.
  • the hammer mechanism 1 shown in Figure 1 shows in its central percussion section 2 along a longitudinal axis 3 extending hammer tube 4. Within the hammer tube 4 are located on the longitudinal axis 3 linearly arranged one behind the other a firing pin 5 and a racket 6. The firing pin surrounding part 7 of the hammer tube 4 is formed as a firing pin 8. The beater 6 encompassing part 9 of the hammer tube 4 is formed as a racket guide 10.
  • the firing pin 5 has a central region 11 with a maximum diameter (main diameter), which is delimited at the two ends 12, 13 of the firing pin 5 by two sections 14, 15, which have a smaller diameter than the region 11.
  • the firing pin guide 8 has two tapered guide regions 16, 17, wherein the second guide region 17 is formed, at least partially, by a stop ring 17 'in the form of a steel ring with a contact shoulder 19.
  • the stop ring 17 ' forms with an O-ring 18' a damping device 18.
  • the O-ring 18 ' is formed of a kickback of the firing pin 5 damping material.
  • the region 11 of the firing pin 5 has a radial at its end facing the section 15
  • Projection 20 which is formed as a ring strip 21.
  • the annular strip 21 passes on its side facing the racket 22 in an annular shoulder 23, which is arranged between the region 11 and the portion 15. Between the region 11 and the section 14, a further annular shoulder 24 is arranged.
  • a central axial portion 25 of the firing pin 8 is located in an annular groove 26 designed as an elastic catch ring 27 safety gear 28 for releasably securing the firing pin 5 in a racket 6 facing away from here -here shown (idle position).
  • the annular shoulder 24 strikes the application shoulder 33 and the firing pin 5 will rebound against the direction of impact (arrow 31). This rebounding may be more or less dampened depending on the damping capacity of the application shoulder 33.
  • the annular strip 21 again meets the catching ring 27, which catches it in the neutral position due to positive locking and / or frictional engagement in the event of not too great a setback (rebounding). This results in a rear grip of the end 13 facing side 22 with the catch ring 27.
  • the racket 6 can be brought into its in the direction of the tool member 34 advanced idle position, so that the end face 30 abuts the end 13. In this case, the racket idling openings 35 in the hammer tube 4 free.
  • the damping device 18 is designed as a B-impact damping device 36, which dampens the kickback of the firing pin.
  • FIGS 2A, 3A, 4A and 5A show four different embodiments of the impact mechanism 1 according to the invention, wherein the firing pin 5 and the racket 6 respectively in the
  • FIG. 2B, 3B, 4B and 5B show the respective corresponding embodiments, wherein the firing pin 5 and the racket 6 are in a respective neutral position.
  • the construction of the percussion mechanism 1 according to the invention essentially corresponds to the structure of the percussion mechanism 1 shown in FIG. 1, so that only the differences are discussed here.
  • FIGS. 2A to 5B show at the end of the hammer tube 4, the drive 37 of the racket 6, the one out of a not shown motor driven piston 38 with sealing ring 39 is made, which puts the racket 6 with sealing ring 40 via a arranged between this and the piston 38 air cushion 41 in the reciprocating motion. If racket 6 and firing pin 5 are in the neutral position (FIGS. 2B, 3B, 4B, 5B), the racket 6 releases the idling openings 35, which in the idling position provide a pressure equalization of the air cushion 41 with the environment.
  • the percussion mechanism 1 has a catching device 28 designed as a catching ring 27, which engages a projection 20 in the section 15 of the firing pin 5 designed as a ring ledge 21.
  • the catching ring 27 is integrated into the damping device 18 for this purpose.
  • the maximum diameter of the firing pin 5 (main diameter) in the area 11 can be selected to be largely free since this is not limited by the size of the catching device 28 designed as catching ring 27 designed as a B-shock damping device 36
  • Damping device 18 consists of two stop plates 42, 43 between which the catch ring 27 formed as a damping ring 44 is arranged. This can me the annular shoulder 23 of the annular strip 21 in the back grip and releasably fix the firing pin 5 in the neutral position.
  • the damping ring 44 corresponds in his
  • the racket guide 10 may have a designed as a free rotation 45 annular groove 46, in which the sealing ring 40 snap and the racket 6 in its front end position (Idle position) can hold.
  • FIGS. 3A and 3B show an additional possibility of fixing via a prestressed O-ring 48 'which is inserted in an annular groove 47 of the firing pin 5 and which can snap into the firing pin guide 8 in a recess 50 designed as a free rotation 49 and prevent rebounding of the firing pin 5.
  • the O-ring 48 ' forms a resilient projection 48. At the same time, this O-ring 48' serves for sealing. This additional fixation option can be used to support.
  • FIGS. 4 and 5 show a specially shaped impact damping unit 51, which has targeted damping and catching properties due to its shape. Since the impact bolt-side locking disk 42 is omitted in the shock-absorbing unit 51, the impact-damping unit 51 can be made shorter than the solution with stop disks 42, 43 and the damping ring 44.
  • the impact-damping unit 51 is constructed in two parts in the simplest case. An elastomeric part 52 is firmly connected to a steel ring 53. The connection can be made by vulcanizing or a positive jamming or caulking.
  • the steel ring 53 has continuous at its inner circumference 54 Grooves 55, can pass through the at least one projection 56 of the elastomeric member 52 in the neutral position of the racket 6 up to this, so the projection can buffer as the bumper 6 shortly before reaching its front end position (idle position) decelerate, whereby a strong bounce back the racket 6 can be prevented.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

La présente invention concerne un mécanisme de percussion (1) d'une machine-outil, en particulier d'une machine-outil manuelle, avec un percuteur (5) qui comporte une zone (11) de diamètre maximal et auquel au moins un dispositif d'arrêt (28) est affecté. Il est prévu que le dispositif d'arrêt (28) entre en prise avec une section (15) du percuteur (5) dont le diamètre est inférieur à celui de la zone (11).
EP07728284A 2006-06-06 2007-04-19 Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté Withdrawn EP2029326A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006026158 2006-06-06
PCT/EP2007/053824 WO2007141080A1 (fr) 2006-06-06 2007-04-19 Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté

Publications (1)

Publication Number Publication Date
EP2029326A1 true EP2029326A1 (fr) 2009-03-04

Family

ID=38255532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07728284A Withdrawn EP2029326A1 (fr) 2006-06-06 2007-04-19 Mécanisme de percussion avec un percuteur et un dispositif d'arrêt affecté

Country Status (6)

Country Link
US (1) US20080296034A1 (fr)
EP (1) EP2029326A1 (fr)
JP (1) JP2009539628A (fr)
CN (1) CN101466503A (fr)
RU (1) RU2008152183A (fr)
WO (1) WO2007141080A1 (fr)

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DE102008010100A1 (de) * 2008-02-20 2009-08-27 Robert Bosch Gmbh Handwerkzeugmaschine
DE102008040118A1 (de) * 2008-07-03 2010-01-07 Robert Bosch Gmbh Bohr- und/oder Meißelhammer
DE102009026542A1 (de) * 2009-05-28 2010-12-09 Hilti Aktiengesellschaft Werkzeugmaschine
DE102010044011A1 (de) * 2010-11-16 2012-05-16 Hilti Aktiengesellschaft Handwerkzeugmaschine
GB201112829D0 (en) 2011-07-26 2011-09-07 Black & Decker Inc Hammer
DE102012220886A1 (de) * 2012-11-15 2014-05-15 Hilti Aktiengesellschaft Werkzeugmaschine
AU2014275576A1 (en) * 2013-06-07 2016-01-28 Progressive Ip Limited Improvements in and relating to pile and impact driving equipment
EP3181300A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil portative a percussion
EP3181298A1 (fr) * 2015-12-15 2017-06-21 HILTI Aktiengesellschaft Machine-outil a percussion
EP3281747A1 (fr) * 2016-08-09 2018-02-14 HILTI Aktiengesellschaft Machine-outil portative

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Also Published As

Publication number Publication date
US20080296034A1 (en) 2008-12-04
RU2008152183A (ru) 2010-07-20
WO2007141080A1 (fr) 2007-12-13
CN101466503A (zh) 2009-06-24
JP2009539628A (ja) 2009-11-19

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