EP3349944B1 - Appareil d'enfoncement entraîné par combustible doté d'une articulation de soupape - Google Patents

Appareil d'enfoncement entraîné par combustible doté d'une articulation de soupape Download PDF

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Publication number
EP3349944B1
EP3349944B1 EP16760514.6A EP16760514A EP3349944B1 EP 3349944 B1 EP3349944 B1 EP 3349944B1 EP 16760514 A EP16760514 A EP 16760514A EP 3349944 B1 EP3349944 B1 EP 3349944B1
Authority
EP
European Patent Office
Prior art keywords
valve member
driving
driving device
combustion chamber
piston
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.)
Active
Application number
EP16760514.6A
Other languages
German (de)
English (en)
Other versions
EP3349944A1 (fr
Inventor
Klaus Raggl
Christoph Boehm
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.)
Hilti AG
Original Assignee
Hilti AG
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Publication date
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Publication of EP3349944A1 publication Critical patent/EP3349944A1/fr
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Publication of EP3349944B1 publication Critical patent/EP3349944B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/082—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a pellet
    • B25C1/085—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a pellet trigger operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/008—Safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/044—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with movable main cylinder
    • B25C1/046—Trigger valve and trigger mechanism
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/047—Mechanical 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
    • B25D2250/121—Housing details

Definitions

  • the invention relates to a driving tool, in particular a handheld driving tool, according to the preamble of claim 1.
  • WO 2012/046217 A1 describes a drive-in device in which a drive-in piston is moved against a combustion chamber by means of a drive generating an excess pressure. This allows the drive energy to be increased with the same combustion chamber size.
  • WO 2009/140728 A1 describes a fuel gas powered driving tool for driving a nail into a workpiece, in which a combustion chamber is fed with a fuel gas, wherein a driving piston against the nail is accelerated after an ignition process.
  • the combustible gas can be charged to a positive pressure by combined measures by means of a fan and the stroke of the driving piston in order to increase the driving energy.
  • DE 40 10 517 A1 shows a conventional, non-charged driving tool.
  • a driving energy can be influenced via an adjustable blow-off valve, through which a part of the burned and expanded gas escapes during the piston acceleration.
  • An overpressure of the fuel gas mixture in the sense of the invention means an increased pressure to increase the driving energy. Even with conventional, uncharged devices, the pressure of the fuel gas mixture is usually somewhat above an ambient pressure, since the fuel gas under pressure is added to the air in the combustion chamber, which is at atmospheric pressure. This is only a small increase in pressure.
  • An overpressure in the sense of the invention is preferably at least 100 mbar, particularly preferably at least 200 mbar, above atmospheric pressure.
  • valve member in the sense of the invention blocks or opens a connection between the combustion chamber and / or the cylinder and an outside space.
  • the valve member is not understood to mean a movable combustion chamber part, the displacement of which first forms the combustion chamber.
  • the combustion chamber comprises at least two combustion chamber parts which can be moved relative to one another, the combustion chamber parts being combined to form the closed combustion chamber only when the driving tool is pressed on.
  • Devices of this type are generally known and, due to their design, have a high level of security against unwanted or improper triggering.
  • the combustion chamber parts are moved relative to one another via a pressure linkage.
  • valve member is designed as a switching valve connected to the combustion chamber. This allows in particular continuous adjustment of the overpressure over a wide range.
  • a switching valve is preferably understood to mean an electrically controlled switching valve which has at least the two states “open” and "closed”.
  • valve member is switched as a function of a position of the driving piston.
  • the overpressure achieved is connected to the location of the start of a compressing piston movement, the preceding de piston movement causing no compression because of the opened valve.
  • the valve member can also be timed. With a correspondingly known cross section of the valve member and size of the combustion chamber, a targeted pressure reduction in the combustion chamber can then be achieved.
  • valve member is switched as a function of a measurement by means of a pressure sensor.
  • the pressure sensor requires an additional component, on the other hand, the desired pressure can be set particularly precisely and reliably.
  • the valve member can be designed as an adjustable pressure relief valve. This allows, for example, simple implementation by means of a spring mechanism on the valve member. In order to avoid or reduce a partial blowing off of the higher combustion pressure after the ignition of the fuel gas mixture, such a valve member can be provided with an additional pressure-proof closing function. As an alternative to this, the valve member can also be provided with a correspondingly small cross section, which leads to only a slight pressure loss during the driving-in process. The fact that the resetting or compression process is usually considerably slower than the combustion or driving-in process can be used here.
  • the valve member is designed as at least one selectively closable opening arranged on the cylinder.
  • the driving piston can be moved without compression up to the opening. After the piston has passed the opening, the compression begins.
  • a plurality of valve members or selectively closable openings can be arranged one behind the other in the longitudinal direction of the cylinder, so that a corresponding multi-stage adjustment of the compression path or the overpressure is made possible.
  • the valve member can also be a slot-shaped opening in the cylinder wall, which can be covered continuously, for example by means of a displaceable outer sleeve.
  • the valve member can be generally advantageously controllable via an electronic control unit of the driving tool. Alternatively, however, it can also be a mechanical control with manual operation. Mechanical control can be implemented in a particularly simple manner by means of an adjustable pressure relief valve or by means of an selectively closable opening provided in the cylinder wall.
  • the driving piston for generating the excess pressure is adjustable via an electric drive.
  • the mechanical work to compress or charge the fuel gas to the overpressure is done by the drive. This allows a high frequency of setting operations.
  • a further charging member preferably an electrically driven compressor, is additionally provided to apply an overpressure of the fuel gas mixture to the combustion chamber.
  • a further charging member preferably an electrically driven compressor
  • Such a device accordingly not only has an internal charge by means of the movement of the driving piston, but also an external charge by means of the further charging element. If necessary, this also allows charging with an even higher overpressure, so that a particularly wide adjustability of the driving energy is made possible.
  • the tacker off Fig. 1 is a hand-held device, comprising a housing 1 and a combustion chamber 2 accommodated therein with a combustion chamber wall.
  • a cylinder 3 adjoins the combustion chamber 2 with a driving piston 4 guided therein.
  • a safety mechanism of the device comprises a pressure linkage with a mounting sleeve 5, which is placed on a workpiece (not shown) and pressed in against the pressure of a spring (not shown). Only in this state can a driving-in process be triggered by igniting a fuel gas in the combustion chamber 2.
  • the combustion chamber 2 consists of a plurality of combustion chamber parts (not shown) which can be moved relative to one another and which are only combined after the placement sleeve 5 has been pressed in via the pressure linkage to form a closed space for receiving an ignitable fuel gas mixture.
  • Such types of combustion chambers with the aim of improving safety are generally known, for example from the publications mentioned at the beginning. In the present schematic drawings, therefore, the detailed illustration of this safety mechanism has been omitted.
  • an ignitable fuel gas mixture is introduced into the combustion chamber 2 by means of a fuel gas storage device 6.
  • the fuel gas is compressed in the course of a resetting of the driving piston 4 to an overpressure.
  • the driving piston 4 is driven by an electric drive 8 which is supplied by a rechargeable battery 7 and which engages a driving plunger 4a of the driving piston 4.
  • the fuel gas is introduced into the air of the combustion chamber 2 from the fuel gas storage 6 via a metering valve 9.
  • the fuel gas injection can take place in the not yet compressed, partially compressed or even completely compressed air.
  • ignition of the fuel gas mixture can then be triggered via a spark plug 12 by means of a manually operated trigger 11, so that the driving piston 4 is advanced and drives a nail member (not shown) from a magazine 13 into the workpiece via the driving plunger 4a.
  • the exhaust gases of the ignited and expanded fuel gas can enter the outside via outlet openings 14 at the end of the path of the driving piston.
  • the overpressure in the combustion chamber 2 achieved by the resetting of the driving piston can be set selectively by means of a valve member 15 arranged on the combustion chamber 2.
  • the valve member 15 is designed as an electrically operated switching valve, which is connected to an electronic control unit of the driving tool.
  • a driving energy is preselected in a given frame via an adjustment by an operator.
  • the valve member is either closed permanently (maximum compression and driving energy) or it is only closed after a certain stroke of the driving piston on its return path.
  • valve member 15 In the state after Fig. 1 the valve member 15 is still in an open state while the driving piston is already being moved in the direction of the combustion chamber. As a result, air escapes through the valve member 15 (represented by arrows) and there is still no compression.
  • Fig. 3 shows the fully reset driving piston 4, which is still in contact with the magnet holder 10, while the ignition process is initiated by actuating the trigger 11.
  • valve member 15 is not designed as an electrically controlled switching valve as in the first exemplary embodiment, but rather as an adjustable pressure relief valve or pressure control valve. This type of valve also allows, for example, a purely mechanical preselection of the excess pressure by the operator.
  • the pressure relief valve Depending on the preload or the setting of the pressure relief valve, it opens as soon as the pressure generated by the driving piston is above the set threshold.
  • the pressure relief valve is also completely closed when the fuel gas mixture is ignited. This can be achieved, for example, by a second switching state or an additional valve connected in series (not shown). Since the process of expansion of the ignited fuel gas usually takes place much faster than that Compression process, it may also be sufficient, depending on the requirements, to dimension the pressure relief valve with a correspondingly small outlet cross section.
  • valve member 15 is arranged on the combustion chamber or is connected directly to it. In the third exemplary embodiment described below according to 5 to 6 the valve member 15 is arranged on the cylinder 3.
  • a wall of the cylinder 3 is provided with a plurality of openings 16 arranged at a distance in the longitudinal direction of the cylinder.
  • a valve slide in the present case in the form of a sleeve 17, can selectively close the openings 16.
  • the driving piston 4 begins to compress at different positions depending on the position of the valve slide 17.
  • valve slide 17 is positioned such that the opening positioned closest to the combustion chamber is not closed. This leads to a maximum late compression of the driving piston on its return path and thus to a minimal overpressure.
  • valve slide 17 is positioned so that all openings 16 are covered. This leads to compression over the entire path of the driving piston and therefore to maximum overpressure and maximum driving energy.
  • any desired gradations of the driving energy can be achieved.
  • a continuous adjustment of the driving energy can also take place through an opening slotted in the longitudinal direction of the cylinder.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Claims (9)

  1. Appareil d'enfoncement, comprenant
    un piston d'enfoncement (4) guidé dans un cylindre (3) pour enfoncer un élément de type clou dans une pièce, et
    une chambre de combustion (2) disposée au niveau du piston d'enfoncement (4), laquelle peut être remplie d'un mélange de gaz combustible inflammable,
    une surpression du mélange de gaz combustible pouvant être générée dans la chambre de combustion par un déplacement du piston d'enfoncement (4), au moins l'un de la chambre de combustion (2) et du cylindre (3) étant connecté par le biais d'un organe de soupape (15) à un espace extérieur,
    caractérisé en ce que la surpression du mélange de gaz combustible générée par le piston d'enfoncement peut être ajustée de manière sélective au moyen de l'organe de soupape (15).
  2. Appareil d'enfoncement selon la revendication 1, caractérisé en ce que l'organe de soupape (15) est réalisé sous la forme d'une soupape de commutation connectée à la chambre de combustion (2).
  3. Appareil d'enfoncement selon la revendication 2, caractérisé en ce qu'une commutation de l'organe de soupape (15) s'effectue en fonction d'une position du piston d'enfoncement (4).
  4. Appareil d'enfoncement selon l'une quelconque des revendications 2 et 3, caractérisé en ce qu'une commutation de l'organe de soupape (15) s'effectue en fonction d'une mesure au moyen d'un capteur de pression.
  5. Appareil d'enfoncement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe de soupape (15) est réalisé sous forme de soupape de surpression ajustable.
  6. Appareil d'enfoncement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe de soupape (15) est réalisé sous la forme d'au moins une ouverture (16) disposée au niveau du cylindre (3), pouvant être fermée de manière sélective.
  7. Appareil d'enfoncement selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe de soupape (15) peut être piloté par le biais d'une unité de commande électronique de l'appareil d'enfoncement.
  8. Appareil d'enfoncement selon l'une quelconque des revendications précédentes, caractérisé en ce que le piston d'enfoncement (4) peut être réglé par le biais d'un entraînement électrique (8) pour générer la surpression.
  9. Appareil d'enfoncement selon l'une quelconque des revendications précédentes, caractérisé en ce qu'en outre un organe de charge supplémentaire, en particulier un compresseur entraîné de manière électrique, est prévu pour solliciter la chambre de combustion (2) avec une surpression du mélange de gaz combustible.
EP16760514.6A 2015-09-14 2016-09-06 Appareil d'enfoncement entraîné par combustible doté d'une articulation de soupape Active EP3349944B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15185077.3A EP3141347A1 (fr) 2015-09-14 2015-09-14 Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape
PCT/EP2016/070923 WO2017045967A1 (fr) 2015-09-14 2016-09-06 Cloueuse fonctionnant au moyen d'un gaz combustible et dotée d'un élément soupape

Publications (2)

Publication Number Publication Date
EP3349944A1 EP3349944A1 (fr) 2018-07-25
EP3349944B1 true EP3349944B1 (fr) 2020-02-19

Family

ID=54145645

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15185077.3A Withdrawn EP3141347A1 (fr) 2015-09-14 2015-09-14 Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape
EP16760514.6A Active EP3349944B1 (fr) 2015-09-14 2016-09-06 Appareil d'enfoncement entraîné par combustible doté d'une articulation de soupape

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15185077.3A Withdrawn EP3141347A1 (fr) 2015-09-14 2015-09-14 Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape

Country Status (3)

Country Link
US (1) US20180236646A1 (fr)
EP (2) EP3141347A1 (fr)
WO (1) WO2017045967A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI781941B (zh) * 2016-07-29 2022-11-01 日商工機控股股份有限公司 釘打機
TWI751176B (zh) * 2016-08-31 2022-01-01 日商工機控股股份有限公司 打釘機、壓力調節器和打釘單元
CN211805946U (zh) 2018-07-18 2020-10-30 米沃奇电动工具公司 动力工具
WO2022067235A1 (fr) 2020-09-28 2022-03-31 Milwaukee Electric Tool Corporation Dispositif d'entraînement à impulsions

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Publication number Priority date Publication date Assignee Title
DE4010517B4 (de) 1990-04-02 2004-04-08 Hilti Ag Gasbetriebenes Arbeitsgerät
DE10013270A1 (de) * 2000-03-17 2001-09-20 Krupp Berco Bautechnik Gmbh Fluidbetriebenes Schlagwerk
DE10260702B4 (de) * 2002-12-23 2014-01-30 Hilti Aktiengesellschaft Brennkraftbetriebenes Setzgerät
DE10260704A1 (de) * 2002-12-23 2004-07-01 Hilti Ag Brennkraftbetriebenes Setzgerät
DE102005000107B4 (de) * 2005-08-25 2014-03-13 Hilti Aktiengesellschaft Pneumatisch betriebenes Setzgerät
DE102005000149A1 (de) * 2005-11-04 2007-05-10 Hilti Ag Brennkraftbetriebenes Setzgerät
DE102008000909A1 (de) * 2008-04-01 2009-10-08 Hilti Aktiengesellschaft Brennkraftbetriebenes Setzgerät
WO2009140728A1 (fr) 2008-05-21 2009-11-26 Poly Systems Pty Ltd Outil d’entraînement d’attaches
FR2965741B1 (fr) 2010-10-08 2013-05-31 Prospection & Inventions Appareil de fixation a precompression du gaz d'entrainement et le procede de fixation correspondant
DE102012206108A1 (de) * 2012-04-13 2013-10-17 Hilti Aktiengesellschaft Eintreibgerät
US9381635B2 (en) * 2012-06-05 2016-07-05 Illinois Tool Works Inc. Fastener-driving tool including a fastening result detector
EP2826599A1 (fr) * 2013-07-16 2015-01-21 HILTI Aktiengesellschaft Procédé de commande et machine-outil manuelle
EP3141348A1 (fr) * 2015-09-14 2017-03-15 HILTI Aktiengesellschaft Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape
EP3349946B1 (fr) * 2015-09-14 2020-08-05 Hilti Aktiengesellschaft Cloueur entraine par combustible comprenant un magazin

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Also Published As

Publication number Publication date
EP3349944A1 (fr) 2018-07-25
WO2017045967A1 (fr) 2017-03-23
EP3141347A1 (fr) 2017-03-15
US20180236646A1 (en) 2018-08-23

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