EP2457700A2 - Appareil d'enfoncement - Google Patents

Appareil d'enfoncement Download PDF

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Publication number
EP2457700A2
EP2457700A2 EP11186886A EP11186886A EP2457700A2 EP 2457700 A2 EP2457700 A2 EP 2457700A2 EP 11186886 A EP11186886 A EP 11186886A EP 11186886 A EP11186886 A EP 11186886A EP 2457700 A2 EP2457700 A2 EP 2457700A2
Authority
EP
European Patent Office
Prior art keywords
fuel
combustion chamber
tacker
tacker according
tank
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Withdrawn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
EP11186886A
Other languages
German (de)
English (en)
Other versions
EP2457700A3 (fr
Inventor
Simon Beauvais
Tilo Dittrich
Norbert Heeb
Peter Stauss
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 EP2457700A2 publication Critical patent/EP2457700A2/fr
Publication of EP2457700A3 publication Critical patent/EP2457700A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a tacker, in particular a hand-held tacker, according to the preamble of claim 1.
  • DE 102 60 703 A1 describes a liquid gas driven driving tool having a metering chamber with an adjustable metering volume.
  • the metering volume can be changed by an electromotive drive, and a discharge of liquid gas into a combustion chamber is initiated by a pneumatic drive by means of compressed air.
  • the temperature-dependent change in the amount of fuel introduced into the combustion chamber by means of the stepping motor ensures in a simple manner a reliable ignition and a uniform function of the tacker, even if ambient temperatures or operating temperatures of the device change.
  • the relevant temperature may be, for example, the temperature in or within the combustion chamber, or the ambient temperature of the tacker.
  • stepper motor in the context of the invention is to be understood as any electric motor and / or servo drive, which is adjustable by a minimum step or an integral multiple thereof.
  • stepper motors are used with self-holding, whereby additional security against unwanted adjustment of the metering is given.
  • the stepper motor may be formed as a unipolar stepper motor, in which the coils are only switched on or off.
  • the metering volume is variable by an adjustment of the stepping motor.
  • the stepping motor may act as an actuator that alters a limiting wall or membrane of the metering volume.
  • the metering device comprises a movable displacement member for expelling the defined amount of fuel, wherein preferably a stop position of the displacement member via the stepping motor is variable.
  • a movable displacement member for expelling the defined amount of fuel, wherein preferably a stop position of the displacement member via the stepping motor is variable.
  • the metering of the fuel takes place predominantly or exclusively in the liquid phase, as a result of which the amount of fuel spent in the combustion chamber is defined particularly precisely.
  • such exclusive metering of liquid phase can be ensured, for example, by arranging a membrane in the fuel tank, wherein the liquid gas is held in the liquid phase only in the membrane and an inert gas outside the membrane, for example defined overpressure is provided.
  • the liquid gas In the course of the consumption of the fuel expands while the intergas and keeps due to its overpressure, the liquid gas at any time in the liquid phase.
  • Such a per se known configuration of a fuel tank is basically accompanied in practice with a certain change in the pressure in the fuel tank in the course of its emptying.
  • a drive of the displacement member via a pressure of the fuel in particular via a connection to the fuel tank, driven.
  • additional drives such as electric or pneumatic actuators for the displacement.
  • the stored in the fuel tank mechanical energy is used to make it possible to quickly and accurately the metering of the fuel into the combustion chamber.
  • the displacer can be held in a starting position by force, preferably, but not necessarily, by means of a spring.
  • force preferably, but not necessarily, by means of a spring.
  • the metering device comprises no sensor for measuring the defined amount of the fuel. All possibly existing sensors of the tacker are arranged outside the metering device.
  • the waiver of a measuring sensor for example, to report the position of a motor position, gear position or the position of a stop or a variable wall of the dosing volume is in particular by the inventive use of a stepping motor favors because there is a sufficiently accurate control over the set amount of fuel through the accurate, gradual adjustment of the engine.
  • a sensor may also be provided depending on the requirements. For example, the adjustment of the stepping motor can be determined by comparing a desired position with an actual position determined by the sensor.
  • a basic setting of the defined quantity can be determined by an initialization routine of the stepping motor.
  • the stepper motor is moved against a defined stop.
  • a defined state of the metering device can be produced by simple means, for example after a reset of the tacker, a battery change, a change of the fuel tank, etc.
  • the stepper motor is advantageously connected to a self-locking gear, preferably but not necessarily in the form of a linear actuator.
  • Self-locking gears such as e.g. Threads prevent in a simple way a misalignment of the set dosing.
  • the metering device comprises at least one valve member, wherein the valve member is particularly preferably operated electrically.
  • the valve member in the interest of a simple and effective implementation as a three-way valve, in particular with two switching positions, be formed. Overall, this allows a simple and reliable control of the metering device.
  • the two switching positions of the three-way valve can be configured as bistable positions, whereby a particularly low consumption of electrical energy for the valve member is made possible.
  • the line 3 connects a metering device 4 with the combustion chamber 2, wherein the metering device 4 in turn is connected to the fuel tank 5 arranged in or on the housing 1.
  • the fuel tank can be designed in particular as a replaceable cartridge.
  • the tacker also includes an electronic control 6 with an electric accumulator as energy storage. Via the electronic control 6, a spark plug 7 in the combustion chamber 2 is controlled and optionally the metering device 4, provided that it has electrical valves or other electrically controlled components.
  • a magazine 8 for storing fasteners, such as nails is arranged in a front portion of the tacker.
  • a pressing member 9 can be pressed against a workpiece to release a triggering of the tacker.
  • Fig. 2 shows a first embodiment of the metering device 4.
  • the metering device 4 comprises a metering volume 12 which is connected via an input side, electrically controllable valve 13 to the fuel tank 5 and is connected via an output side, electrically controllable valve 14 to the combustion chamber 2.
  • the adjusting unit is connected via a present as a thread 15a trained, self-locking gear with an elastic or sliding wall 12a of the dosing volume 12, wherein the size of the dosing volume in response to an adjustment of the stepping motor 15th changes.
  • the adjustment of the stepping motor 15 via the central electronic control 6.
  • a temperature is measured by means of a temperature sensor, not shown, and read by the control unit.
  • the stepper motor 15 is then adjusted so that the dosing volume is adapted to the temperature in accordance with the characteristic curve.
  • the temperature sensor may measure, for example, an ambient temperature or a temperature of the combustion chamber 2. It is also conceivable that a plurality of temperature sensors are provided.
  • the left picture in Fig. 2 shows a position of the stepping motor 15 or dosing volume 12 at a low temperature with maximum dosing.
  • the right temperature shows a corresponding limit position for a high temperature, especially for temperatures above 20 ° C.
  • the metering device according to Fig. 2 works like this:
  • the input-side valve 13 is opened by means of the controller 6, so that liquid gas in the liquid phase can flow into the metering volume 12 set by the stepping motor 15.
  • the liquefied gas in the tank 5 is exclusively in liquid Phase ahead. This is achieved in a manner known per se by enclosing the liquefied gas in the tank in a membrane and filling the space outside the membrane with an inert gas at a pressure higher than the vapor pressure of the liquefied gas. Due to this overpressure no evaporation process takes place in the course of the inflow of the liquefied gas into the metering volume 12, so that substantially no temperature change takes place in the course of the inflow of the liquefied gas.
  • the input-side valve 13 is closed and the output-side valve 14 is opened, so that the liquefied gas can flow into the combustion chamber 2.
  • the amount of liquid metered into the combustion chamber 2 is greater, so that even with a slower evaporation, an ignitable rapidly providing an ignitable mixture takes place in the combustion chamber 2 ,
  • Fig. 3a to Fig. 4b show a second embodiment of the invention.
  • An essential difference from the preceding embodiment is that the liquid gas is expelled from the metering volume 12 by means of a movable displacement member 16.
  • the displacement member 16 is formed as a linearly displaceable piston, which is located in a cylinder 17 which is part of the dosing volume 12.
  • the cylinder 17 connects to an electrically operated valve member 18, which in addition to the connection with the cylinder 17 has a connection to the fuel tank 5 and a connection to the combustion chamber 2.
  • a valve spool 19 closes either the connection 18a with the fuel tank 5 or the connection 18b with the combustion chamber 2.
  • the valve member 18 is formed as a 3-way valve with two valve positions.
  • the positions of the valve slide 19 can each be stable positions (bistable valve slide), so that only a short, low-energy-requiring electrical pulse is required to switch over the valve.
  • the valve spool 19 is always in a de-energized rest position as in Fig. 3a arranged, so under closure of the connection 18b with the combustion chamber 2 (monostable valve spool). By applying an electrical voltage the valve spool is in the opposite position (see Fig. 3b ), in which it closes the connection 18a with the fuel tank 5.
  • valve member 18 includes a certain own volume, which contributes to the dosing volume 12.
  • a branch pipe 20 leads to an end of the cylinder 17 opposite to the valve member 18.
  • the branch pipe 20 connects an upper end of the piston-shaped displacer 16 to the fuel tank 5.
  • a stepper motor 15 with a self-locking gear 15 a (in Fig. 3a schematically shown as an integrated unit), by means of which an upper stop 15b for the displacement member 16 is temperature-dependent adjustable.
  • the stop is provided by a temperature-dependent movable stop pin 15 b, which protrudes relatively far into the cylinder 17 to cause a smaller stroke of the piston 16.
  • the piston 16 is also biased by a spring (not shown) in its upper stop position, which is indicated by the upward arrow in Fig. 3a and Fig. 4a is symbolized. At this starting position after Fig. 3a respectively. Fig. 4a is located above and below the piston 16, the pressure of the fuel tank 5 in the cylinder 17 at.
  • the spring force is used only for a defined positioning of the piston 16 in a starting position. Accordingly, the force of the positioning spring can be made relatively small.
  • a triggering operation of the tacker is now carried out by switching the valve spool 19 of the valve member in the opposite position.
  • the cylinder 17 is acted upon via the line 20 with the pressure in the fuel tank 5.
  • the piston 16 is accelerated according to the drawings downwards or in the direction of the valve member 18, wherein it is the LPG the metering volume 12, so the lower part of the cylinder 17 and the volume in the valve member 18 in the combustion chamber 2 suppressed.
  • the piston 16 has taken a lower stop position, each in Fig. 3b and Fig. 4b is shown. According to this sequence, the drive of the displacer 16 takes place via the pressure of the fuel into the tank 5.
  • stepper motor 15, gear 15a and stop pin 15b is controlled by the electronic control unit 6.
  • the stepper motor is specifically driven in one of its directions of movement against a stop, this stop by appropriate mechanical design of the system corresponds to a well-defined absolute position of the stop pin 15b and the metered amount of fuel.
  • this stop may be a stop in the direction of a maximum length of the stop pin 15b.
  • This initialization routine can take place, for example, at defined time intervals after the replacement of an accumulator and / or the fuel tank.
  • stepper motor 15 for the initialization routine it is recommended to drive the stepper motor 15 for the initialization routine with a higher frequency, as this reduces the force against the stop.
  • a sensor that measures the current position of the adjustment and thus directly indicates an absolute position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP11186886.5A 2010-11-25 2011-10-27 Appareil d'enfoncement Withdrawn EP2457700A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010061979A DE102010061979A1 (de) 2010-11-25 2010-11-25 Eintreibgerät

Publications (2)

Publication Number Publication Date
EP2457700A2 true EP2457700A2 (fr) 2012-05-30
EP2457700A3 EP2457700A3 (fr) 2015-10-07

Family

ID=45065667

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11186886.5A Withdrawn EP2457700A3 (fr) 2010-11-25 2011-10-27 Appareil d'enfoncement

Country Status (5)

Country Link
US (1) US20120132687A1 (fr)
EP (1) EP2457700A3 (fr)
JP (1) JP2012111036A (fr)
CA (1) CA2758485A1 (fr)
DE (1) DE102010061979A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010061973A1 (de) * 2010-11-25 2012-05-31 Hilti Aktiengesellschaft Eintreibgerät

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10260703A1 (de) 2002-12-23 2004-07-01 Hilti Ag Brennkraftbetriebenes Setzgerät

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4649700A (en) * 1985-04-29 1987-03-17 Philip Gardiner Fuel control system
DE10244250A1 (de) * 2002-09-24 2004-03-25 Hilti Ag Brennkraftbetriebenes Setzgerät
DE10326473B3 (de) * 2003-06-12 2004-12-16 Hilti Ag Brennkraftbetriebenes Setzgerät
DE10337349A1 (de) * 2003-08-14 2005-03-10 Orange Gmbh Dosierventil
JP5067110B2 (ja) * 2007-10-17 2012-11-07 マックス株式会社 ガス燃焼式打込み工具
US8347832B2 (en) * 2008-10-31 2013-01-08 Illinois Tool Works Inc. Fuel supply and combustion chamber systems for fastener-driving tools

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10260703A1 (de) 2002-12-23 2004-07-01 Hilti Ag Brennkraftbetriebenes Setzgerät

Also Published As

Publication number Publication date
US20120132687A1 (en) 2012-05-31
JP2012111036A (ja) 2012-06-14
DE102010061979A1 (de) 2012-05-31
CA2758485A1 (fr) 2012-05-25
EP2457700A3 (fr) 2015-10-07

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