EP3389930A1 - Appareil d'enfoncement fonctionnant au gaz combustible - Google Patents

Appareil d'enfoncement fonctionnant au gaz combustible

Info

Publication number
EP3389930A1
EP3389930A1 EP16806130.7A EP16806130A EP3389930A1 EP 3389930 A1 EP3389930 A1 EP 3389930A1 EP 16806130 A EP16806130 A EP 16806130A EP 3389930 A1 EP3389930 A1 EP 3389930A1
Authority
EP
European Patent Office
Prior art keywords
piston
driving
tacker
combustion chamber
piezoelectric actuator
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.)
Granted
Application number
EP16806130.7A
Other languages
German (de)
English (en)
Other versions
EP3389930B1 (fr
Inventor
Dominik Schmidt
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
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 Hilti AG filed Critical Hilti AG
Publication of EP3389930A1 publication Critical patent/EP3389930A1/fr
Application granted granted Critical
Publication of EP3389930B1 publication Critical patent/EP3389930B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B25C1/008—Safety devices

Definitions

  • the invention relates to a tacker, in particular a hand-held tacker, according to the preamble of claim 1.
  • the invention also relates to an operating method for a tacker according to the features of claim 10.
  • the invention relates to tackers in which a driving piston is accelerated by a rapidly expanding gas as part of a combustion process.
  • Conventional types of such devices use powder cartridges or an ignitable one
  • EP 1 987 924 A1 describes a rechargeable, fuel gas driven tacking device in which a driving piston is held in a starting position by means of a holding device.
  • the holding device comprises a ball head, which engages in a groove formed on the driving piston in the radial direction and is acted upon by a force.
  • the driving piston can be released by activating an electromagnetic coil.
  • the holding device serves to support the piston against a boost pressure of the fuel gas in the combustion chamber, which is already present before ignition.
  • a piezoelectric actuator in the piston holder, the release can take place at a selected time by means of an electrical voltage, wherein the release can be carried out almost instantaneously due to the high reaction rate of piezoelectric actuators.
  • a piezoactuator is understood to mean any component which uses the inverse piezoelectric effect of a change in length by applying a voltage to a piezoelectric solid. The change in length is used in the sense of a mechanical actuator, by which a state of the piston holder is changed.
  • a release of the piston can be carried out preferably by switching on, but if necessary also by switching off the voltage.
  • piezoactuators comprise a piezoceramic as a piezoelectrically active solid and are usually composed of a plurality of contacted layers.
  • the piston holder of a tacker preferably comprises two or more piezo actuators distributed around the circumference of the piston, in order to ensure a low-torsion and particularly secure mounting.
  • the piston holder comprises an actuatable by means of the piezoelectric actuator latch member for preferably positive locking of the driving piston.
  • a locking member in particular in conjunction with a positive retention, allows a secure mounting of the piston even with high pressure.
  • the piezoelectric actuator acts on the locking member via a transmission. This allows a relative to the piezoelectric actuator significantly increased stroke and thus an adaptation to the mechanical and thermal tolerances usual Eintreibkolben.
  • the transmission makes a clear translation of the change in length of the piezoelectric actuator, preferably by a factor of more than two.
  • the piezoelectric actuator is supported against the force of a biasing spring, whereby a play-free and accurate function of the piston holder is made possible.
  • a release of the drive piston by means of the piezoelectric actuator takes place with a time delay after an ignition process. This allows the targeted release of the drive piston after an already established pressure buildup, whereby the energy transfer to the drive piston and thus the achievable set energy can be increased.
  • the temporal accuracy and the Speed of release are necessary very high and can be achieved by the use of piezoelectric actuators according to the invention.
  • the release preferably takes place as a function of a pressure threshold, a temperature threshold or a defined time interval.
  • the time delay is also adjustable adjustable.
  • the change of the delay can be made by automatic or manual preselection of a value. It may also be provided for an automatic tracking of the delay as a function of the expiry of a previous drive-in operation.
  • the combustion chamber can be filled with an ignitable fuel gas mixture.
  • an overpressure of the fuel gas mixture in the combustion chamber can be generated by means of a charging member.
  • an overpressure of the fuel gas mixture is understood to be an increased pressure to increase the driving energy.
  • the pressure of the fuel gas mixture is usually slightly above an ambient pressure, since the pressurized fuel gas is added to the air under atmospheric pressure in the combustion chamber. This is only a slight increase in pressure.
  • An overpressure according to the invention is preferably at least 100 mbar, more preferably at least 200 mbar above atmospheric pressure.
  • the object of the invention is also achieved by a method for operating a tacker, comprising the steps:
  • the resulting driving energy can be selectively changed and in particular a high maximum driving energy can be achieved.
  • the process according to the invention is preferably carried out by means of a driving-in device according to the invention described above.
  • Fig. 1 shows a schematic sectional view of an inventive
  • FIG. 2 shows a schematic detail view of the tacker of FIG. 1 in front of the
  • FIG. 3 shows a schematic detail of the piston holder from FIG. 2.
  • Fig. 4 shows the piston holder of Fig. 3 in an open state.
  • the tacker of Fig. 1 is a hand-held device comprising a housing 1 and a combustion chamber 2 received therein with a combustion chamber wall. Adjacent to the combustion chamber 2 is a cylinder 3 with a guided therein driving piston 4.
  • the driving piston 4 comprises a driving ram 5 for driving a nail member (not shown) into a workpiece.
  • An ignitable fuel gas mixture is presently introduced by means of a fuel gas storage 6 in the combustion chamber 2.
  • the fuel gas mixture is compressed by means of a charging member 7 to an overpressure.
  • the charging member is designed as an electrically driven and powered by a battery 8 compressor. In other embodiments, charging may also be by means of a powered reset of the driving piston 4 or otherwise.
  • the fuel gas is introduced via a metering valve 9 from the fuel gas storage 6 into the air of the combustion chamber 2. Depending on the requirements, the fuel gas injection can take place in the not yet compressed, partially compressed or completely compressed air.
  • the driving piston 4 is held by a piston holder 10 against the overpressure in the combustion chamber.
  • the piston holder 10 comprises a plurality of, in the present case two, similarly constructed holding members 17, which are distributed around the circumference of the cylinder 3.
  • Each of the holding members has a locking member 18 that is substantially radially movable relative to the cylinder.
  • the locking member 18 each has a bevel 18a on the side facing away from the held piston.
  • the drive piston can push back the latch member 18a by overrunning the bevel against the force of a spring 19.
  • After passing over the latch member 18 each snaps radially back into the cylinder 3, so that the non-tapered side of the locking member 18 holds the driving piston positively against the pressure in the combustion chamber 2 in the starting position.
  • the holding members 17 each include a housing 20 in which the locking member 18 is slidably mounted.
  • a piezoelectric actuator 21 is accommodated in the housing, which is mechanically coupled to the locking member 18 via a gearbox 22.
  • the gearbox 22 is shown schematically as a lever 24 mounted in a pivot point 23.
  • a first end lever 24 engages the locking member 18 and a second, opposite end of the lever 24 is supported on the piezoelectric actuator 21 and on the spring 19.
  • the spring 19 presses the lever 24 against the piezoelectric actuator and in the direction of a closing movement of the locking member 18th
  • the piezoelectric actuator 21 can be acted upon by means of a voltage source 25 with a voltage.
  • the voltage source 25 is supplied centrally from the battery 8 with energy, but generates a sufficiently high voltage for the deflection of the piezoelectric actuator 21.
  • the electrical components of the tacker such as the battery 8 and the voltage source 25 with an electronic control unit (not shown) of the tacker connected.
  • Fig. 3 shows one of the holding members 17 in a closed position, in which the locking member 18 is extended beyond the wall of the cylinder 3 and the drive piston 4 holds. In this position, the piezoelectric actuator 21 is not subjected to voltage and shortened accordingly.
  • Fig. 4 shows the holding member 17 when acted upon by a voltage through the voltage source 25.
  • the piezoelectric actuator 21 has become longer due to the inverse piezo effect and presses the lever 24 against the spring 19 a.
  • the locking member 18 is withdrawn behind the wall of the cylinder 3 and gives the driving piston 4 free.
  • the piezoelectric actuators 21 are de-energized.
  • the combustion chamber is loaded with fuel gas and ignited accordingly.
  • the ignition is triggered by means of an electric spark on the spark plug. This defines the start time of a timer.
  • the piezoelectric actuators 21 are connected to electrical voltage and the piston holder releases the driving piston within a very short period of time. Subsequently, the driving piston is accelerated by the applied pressure and the further pressure increase by the progressive combustion process.
  • a piston holder according to the invention can also be advantageously used without a defined increase in pressure, so that a piston release which is simultaneous with the ignition of the fuel gas mixture can also be provided.
  • a pressure increase was defined by the choice of the given time delay or delay, which means a corresponding approximation and requires sufficient reproducibility of the combustion process.
  • sensory variables such as pressure and / or temperature in the combustion chamber 2 can serve as a criterion for the release of the piston holder.
  • the predetermined period of time and / or corresponding threshold values of measured variables can be changed in meaningful ways in order to vary the driving-in energy as required.

Landscapes

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

Abstract

L'invention concerne un appareil d'enfoncement, comprenant un piston d'enfoncement (4) guidé dans un cylindre (3) et destiné à enfoncer un élément clou dans une pièce, et une chambre de combustion (2) disposée sur le piston d'enfoncement (4) et dans laquelle une élévation de pression est produite par un processus de combustion dans le contexte d'une opération d'enfoncement. Le piston d'enfoncement (4) est maintenu dans une position initiale avant l'opération d'enfoncement au moyen d'un dispositif de maintien de piston (10). Le dispositif de maintien de piston (10) comprend un actionneur piézoélectrique (21).
EP16806130.7A 2015-12-18 2016-12-07 Cloueur entraîné par combustible Active EP3389930B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15201045.0A EP3181295A1 (fr) 2015-12-18 2015-12-18 Cloueur entraine par combustible
PCT/EP2016/079976 WO2017102469A1 (fr) 2015-12-18 2016-12-07 Appareil d'enfoncement fonctionnant au gaz combustible

Publications (2)

Publication Number Publication Date
EP3389930A1 true EP3389930A1 (fr) 2018-10-24
EP3389930B1 EP3389930B1 (fr) 2020-06-24

Family

ID=54936876

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15201045.0A Withdrawn EP3181295A1 (fr) 2015-12-18 2015-12-18 Cloueur entraine par combustible
EP16806130.7A Active EP3389930B1 (fr) 2015-12-18 2016-12-07 Cloueur entraîné par combustible

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15201045.0A Withdrawn EP3181295A1 (fr) 2015-12-18 2015-12-18 Cloueur entraine par combustible

Country Status (4)

Country Link
US (1) US20180370003A1 (fr)
EP (2) EP3181295A1 (fr)
TW (1) TWI630991B (fr)
WO (1) WO2017102469A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11819989B2 (en) 2020-07-07 2023-11-21 Techtronic Cordless Gp Powered fastener driver
CA3167425A1 (fr) 2021-07-16 2023-01-16 Techtronic Cordless Gp Pose-attaches electrique
CA3206998A1 (fr) 2022-07-22 2024-01-22 Techtronic Cordless Gp Controle de micrologiciel fournissant un arret doux de cloueuse a entrainement par compression

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4483473A (en) * 1983-05-02 1984-11-20 Signode Corporation Portable gas-powered fastener driving tool
JPH0325421Y2 (fr) * 1986-03-13 1991-06-03
US4729056A (en) * 1986-10-02 1988-03-01 Motorola, Inc. Solenoid driver control circuit with initial boost voltage
JPH0410704Y2 (fr) * 1987-04-20 1992-03-17
DE4032204C2 (de) * 1990-10-11 1999-10-21 Hilti Ag Setzgerät für Befestigungselemente
DE10222338A1 (de) * 2002-05-21 2003-12-04 Hilti Ag Brennkraftbetriebenes Setzgerät
JP3948351B2 (ja) * 2002-06-05 2007-07-25 マックス株式会社 圧縮空気駆動釘打機のピストンストップ機構
DE10253670B4 (de) * 2002-11-19 2021-05-06 Hilti Aktiengesellschaft Brennkraftbetriebenes Setzgerät
DE10260702B4 (de) * 2002-12-23 2014-01-30 Hilti Aktiengesellschaft Brennkraftbetriebenes Setzgerät
DE10318554B4 (de) * 2003-04-24 2005-03-24 Hilti Ag Brennkraftbetriebenes Setzgerät
EP1529601B1 (fr) * 2003-11-07 2007-10-31 Makita Corporation Outil motorisé par combustion
US7163134B2 (en) * 2004-02-09 2007-01-16 Illinois Tool Works Inc. Repetitive cycle tool logic and mode indicator for combustion powered fastener-driving tool
JP4570893B2 (ja) * 2004-03-31 2010-10-27 日本パワーファスニング株式会社 携帯式ファスナー打ち込み工具
DE102004043955B4 (de) * 2004-09-11 2006-07-20 Hilti Ag Brennkraftbetriebenes Setzgerät
JP4930672B2 (ja) * 2005-08-09 2012-05-16 マックス株式会社 ガス燃焼式打込み工具のファスナー送り機構
WO2007061910A2 (fr) * 2005-11-17 2007-05-31 Illinois Tool Works Inc. Mode d'allumage selectionnable avec verrouillage electromecanique pour un outil a combustion servant a enfoncer des elements de fixation
JP2007222989A (ja) * 2006-02-23 2007-09-06 Max Co Ltd ガスネイラにおける打撃ピストン保持構造
JP5011888B2 (ja) * 2006-08-22 2012-08-29 マックス株式会社 ガス燃焼式打込み工具
JP4899840B2 (ja) * 2006-12-05 2012-03-21 マックス株式会社 ガス燃焼式打込み工具
JP5516185B2 (ja) * 2010-07-26 2014-06-11 マックス株式会社 ガス燃焼式打ち込み工具
JP5447285B2 (ja) * 2010-08-12 2014-03-19 マックス株式会社 ガス燃焼式打ち込み工具

Also Published As

Publication number Publication date
TWI630991B (zh) 2018-08-01
EP3181295A1 (fr) 2017-06-21
US20180370003A1 (en) 2018-12-27
WO2017102469A1 (fr) 2017-06-22
TW201722643A (zh) 2017-07-01
EP3389930B1 (fr) 2020-06-24

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