EP3349945B1 - 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
EP3349945B1
EP3349945B1 EP16760517.9A EP16760517A EP3349945B1 EP 3349945 B1 EP3349945 B1 EP 3349945B1 EP 16760517 A EP16760517 A EP 16760517A EP 3349945 B1 EP3349945 B1 EP 3349945B1
Authority
EP
European Patent Office
Prior art keywords
driving device
combustion chamber
valve member
gas mixture
driving
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
EP16760517.9A
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German (de)
English (en)
Other versions
EP3349945A1 (fr
Inventor
Dominik Schmidt
Tilo Dittrich
Peter Bruggmueller
Norbert Heeb
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
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Hilti AG
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Publication date
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Publication of EP3349945A1 publication Critical patent/EP3349945A1/fr
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Publication of EP3349945B1 publication Critical patent/EP3349945B1/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
    • B25C1/008—Safety devices

Definitions

  • the invention relates to a driving tool, in particular a handheld driving tool, according to the preamble of claim 1.
  • a driving tool corresponding to the preamble of claim 1 is already out EP 2 826 601 A1 known.
  • WO 2009/140728 A1 describes a fuel gas powered driving tool for driving a nail into a workpiece, in which a combustion chamber is charged with a fuel gas, a driving piston being accelerated against the nail 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.
  • US 8,091,751 B2 describes a fuel gas powered tacker in which the fuel gas can be charged to an excess pressure by means of an electric compressor.
  • a combustion chamber of the device comprises a plurality of combustion chamber parts which can be moved relative to one another and is closed by means of a pressure linkage when the driving tool is pressed against a workpiece.
  • valve member opens automatically when the driving tool is set down from the workpiece.
  • Failure to ignite the mixture can have any cause, for example an intentional termination of the setting process by the operator or a malfunction.
  • An overpressure of the fuel gas mixture in the sense of the invention is understood to mean a pressure increased by means of the charging member in order to increase the driving energy. Even in conventional 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.
  • a charging member can be any means that at least raises the air portion of the fuel gas mixture in a targeted manner above atmospheric pressure.
  • it can be an electric compressor.
  • valve member in the sense of the invention blocks or opens a connection between the combustion chamber and an external space in a controllable manner.
  • the valve member is not understood to mean a movable combustion chamber part, the displacement of which first forms the combustion chamber.
  • a pushbutton in the sense of the invention is understood to mean any mechanical, electromechanical, opto-electronic or other component by means of which a pressed-on state of the driving tool can be determined.
  • the feeler element can be, for example, a movable linkage, an electrical switch, an optical sensor or something else.
  • the sensing element is connected to the valve element in such a way that the valve element is activated as a function of a position of the sensing element.
  • the driving device can be discontinued via the feeler element, and the fuel gas mixture under pressure can escape via the valve element.
  • 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. However, when such conventional devices are charged with excess pressure, it can be seen that an automatic opening or even a collapse of the combustion chamber can be disturbed when the device is set down if no ignition has taken place. This is basically due to the fact that such a combustion chamber has large sealing surfaces and sealing systems, on which correspondingly high forces act due to the excess pressure.
  • the combustion chamber parts are closed in a gas-tight manner in the closed state via a self-reinforcing sealing system.
  • a self-reinforcing sealing system In such a system, the contact forces of the seals increase with the pressure present in the combustion chamber, so that a maximum overpressure can in principle be chosen arbitrarily and independently of the force of a pressure spring or the like.
  • the combustion chamber parts are moved relative to one another via a pressure linkage, the pushbutton being provided in addition to the pressure linkage.
  • the valve member can also be controlled directly by the pressure linkage.
  • valve member is designed to be low-force with regard to the excess pressure. This is preferably achieved in a simple manner in that a valve plunger of the valve member has a direction of movement which extends transversely to a direction of action of the excess pressure of the gas mixture. Under a low power Training is to be understood in the present case as any valve arrangement in which a normal operating pressure changes a required actuating force of the valve member at most insignificantly.
  • valve member is mechanically connected directly to the sensing element, so that movement of the sensing element causes the valve to be adjusted. This allows simple implementation and high security against malfunctions, for example of control electronics.
  • the valve member can be adjustable via an electrical actuator.
  • the actuator is preferably connected to an electronic control unit of the driving device.
  • the sensing element can be designed, for example, as an electrical switch or sensor, thereby saving overall construction weight.
  • such a solution allows universal control of the valve member as a safety means.
  • the charging member comprises an electric compressor.
  • the charging member can also be a hand-operated compressor, a compressed air reservoir or the like.
  • the charging member is preferably integrated in the setting tool. Alternatively, the charging member can be separated from the rest of the setting tool.
  • the gas mixture escaping via the valve member drives a generator in order to partially convert mechanical pressure energy into electrical energy.
  • the mechanical energy of the charged gas is not completely lost when the setting process is terminated, but can in part be returned to a battery in the device.
  • the generator is designed by changing the operating mode of the charging member. This can save additional components.
  • 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 into a closed space for receiving an ignitable fuel gas mixture after the placement sleeve 5 has been pressed in via the pressure linkage.
  • 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 charging member 6 and a fuel gas accumulator 7.
  • the charging member 6 is designed as an electric compressor 9 supplied by a rechargeable battery 8.
  • the fuel gas is introduced via a metering valve 10 from the fuel gas store into the compressed air downstream of the compressor 9, after which the flow of the fuel gas mixture enters the combustion chamber 2 via a feed line.
  • an ignition of the fuel gas mixture can be triggered via a manually operated trigger 11, so that the driving piston 4 is advanced and a nail link (not shown) from a magazine 13 into the magazine via a driving plunger 12 Drives in the workpiece.
  • the exhaust gases of the ignited and expanded fuel gas can enter the exterior via outlet openings 14 at the end of the path of the driving piston.
  • the drive-in piston 4 is reset in a conventional manner, for example by means of a return spring.
  • the combustion chamber parts are sealed in the mounted state of the device by means of a sealing system such that an increase in pressure in the combustion chamber 2 leads to an increase in the forces acting on the seals (self-reinforcing sealing system).
  • a spring-driven restoring force of the mounting sleeve is no longer sufficient to open the combustion chamber (or to collapse if the design is appropriate). This means that if the setting process is not triggered and the driving tool is not set, the combustion chamber would remain in the loaded state.
  • a valve member 15 which connects the combustion chamber 2 to the outside.
  • the valve member 15 has a valve spool 16 which moves transversely to a pressure direction or outflow direction of the fuel gas mixture.
  • the valve spool 16 is connected to a feeler element 18 via a mechanical linkage 17.
  • the sensing element 18 is located in the area of the mounting sleeve 5 and is shown in the schematic drawing as a push-in probe tip.
  • the linkage 17 is acted upon by a spring 19, so that the pushbutton 18 is moved forward when the driving tool is not in place and the valve member 15 is in an open state (see Fig. 2 ).
  • valve spool 16 When the driving tool is placed on the workpiece, the feeler 18 is inserted against the spring pressure. The valve spool 16 is displaced via the linkage 17 and the valve member 15 is closed.
  • the valve function is shown in the drawings by overlapping or offset openings in the valve slide 16 and in the combustion chamber wall.
  • the mounting sleeve 5 initially remains in its position, since the combustion chamber parts cannot move.
  • the feeler element 18, on the other hand, moves forward due to the spring force of the spring 19, so that the valve element 15 is opened via the linkage 17. In this way, the fuel gas mixture can escape and the excess pressure in the combustion chamber 2 can be reduced (intermediate state according to Fig. 2 ).
  • the combustion chamber parts can be moved by the applied spring forces, so that the mounting sleeve is also shifted back to the front position (not shown).
  • valve member according to the invention also represents an advantageous further development and a safety gain if the sealing system of the combustion chamber is not designed as self-reinforcing or if the resilient spring force of the combustion chamber parts is also designed for opening under excess pressure. A malfunction in connection with a charged combustion chamber can thereby be reliably avoided.
  • Fig. 3 shows a second embodiment of the invention, in which, in contrast to the first embodiment, the valve member 15 is electrically actuated.
  • valve member 15 has an electrical actuator 20, which is connected to an electronic control unit 21.
  • the pushbutton is designed as an electrical pushbutton switch 22 at the end of the mounting sleeve 5.
  • the key switch 22 is also connected to the control unit 21.
  • the driving tool has a manually operated switch 23, which is easily accessible on the housing 1 of the driving tool.
  • a valve member designed in this way can, for example, be designed to be open when de-energized in order to ensure maximum safety.
  • the closed valve member of the present example is opened during operation when the probe member 22 is not seated on a workpiece. However, opening also occurs when the manually operated switch 23 is pressed. In this way, the operator can unload the combustion chamber at any time or make sure of the unloaded state of the device.

Landscapes

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

Claims (10)

  1. Appareil d'enfoncement, comportant :
    un piston d'enfoncement (4) guidé dans un cylindre (3) pour enfoncer un élément de clou dans une pièce,
    une chambre de combustion (2) agencée sur le piston d'enfoncement (4), qui peut être remplie avec un mélange gazeux inflammable,
    un élément de charge (6) pour obtenir une surpression du mélange gazeux, et
    un élément de détection (18, 22) pour identifier une pression de l'appareil d'enfoncement sur une pièce,
    dans lequel la chambre de combustion (2) est reliée à un espace extérieur par l'intermédiaire d'un élément de soupape (15), caractérisé en ce que
    l'élément de soupape (15) est commandé en fonction d'une position de l'élément de détection (18, 22), de sorte qu'en cas de non-inflammation, la surpression du mélange gazeux peut s'échapper par l'intermédiaire de l'élément de soupape (15).
  2. Appareil d'enfoncement selon la revendication 1, caractérisé en ce que la chambre de combustion (2) comprend au moins deux parties de chambre de combustion mobiles l'une par rapport à l'autre, dans lequel les parties de chambre de combustion sont combinées à la chambre de combustion fermée uniquement lorsque l'appareil d'enfoncement est à l'état pressé.
  3. Appareil d'enfoncement selon la revendication 2, caractérisé en ce que les parties de chambre de combustion à l'état fermé sont fermées de manière étanche aux gaz par l'intermédiaire d'un système d'étanchéité à auto-renforcement.
  4. Appareil d'enfoncement selon l'une des revendications 2 ou 3, caractérisé en ce que les parties de chambre de combustion se déplacent l'une par rapport à l'autre par l'intermédiaire d'une tige de compression (5), dans lequel l'élément de détection (18, 22) est prévu en plus de la tige de compression (5).
  5. Appareil d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que l'élément de soupape (15) est formé de manière à générer une force de faible intensité par rapport à la surpression, dans lequel en particulier un tiroir de soupape (16) de l'élément de soupape (15) a une direction de déplacement qui s'étend transversalement à une direction d'action de la surpression du mélange gazeux.
  6. Appareil d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que l'élément de soupape (15) est mécaniquement et directement relié à l'élément de détection (18), de sorte qu'un mouvement de l'élément de détection (18) entraîne un réglage de l'élément de soupape (15).
  7. Appareil d'enfoncement selon l'une des revendications 1 à 5, caractérisé en ce que l'élément de soupape (15) peut être réglé par l'intermédiaire d'un actionneur électrique (20), dans lequel l'actionneur (20) est en particulier relié à une unité de commande électronique (21) de l'appareil d'enfoncement.
  8. Appareil d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que l'élément de charge (6) comprend un compresseur électrique (9).
  9. Appareil d'enfoncement selon l'une des revendications précédentes, caractérisé en ce que le mélange gazeux s'échappant par l'intermédiaire de l'élément de soupape (15) entraîne un générateur (6) afin de convertir partiellement de l'énergie de pression mécanique en énergie électrique.
  10. Appareil d'enfoncement selon la revendication 9, caractérisé en ce que le générateur (6) est formé en changeant le mode de fonctionnement de l'élément de charge (6).
EP16760517.9A 2015-09-14 2016-09-06 Appareil d'enfoncement entraîné par combustible doté d'une articulation de soupape Active EP3349945B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15185079.9A EP3141348A1 (fr) 2015-09-14 2015-09-14 Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape
PCT/EP2016/070938 WO2017045971A1 (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
EP3349945A1 EP3349945A1 (fr) 2018-07-25
EP3349945B1 true EP3349945B1 (fr) 2020-03-04

Family

ID=54145646

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15185079.9A Withdrawn EP3141348A1 (fr) 2015-09-14 2015-09-14 Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape
EP16760517.9A Active EP3349945B1 (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
EP15185079.9A Withdrawn EP3141348A1 (fr) 2015-09-14 2015-09-14 Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape

Country Status (4)

Country Link
US (1) US10759032B2 (fr)
EP (2) EP3141348A1 (fr)
CN (1) CN108025426B (fr)
WO (1) WO2017045971A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3141347A1 (fr) * 2015-09-14 2017-03-15 HILTI Aktiengesellschaft Appareil d'enfoncement entraine par combustible dote d'une articulation de soupape
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
EP3524391B1 (fr) * 2018-01-19 2022-05-04 Max Co., Ltd. Outil d'enfoncement de type combustion à gaz
CA3030703C (fr) * 2018-01-19 2022-04-12 Max Co., Ltd. Outil d'entrainement
CA3052627A1 (fr) * 2018-08-21 2020-02-21 Power Tech Staple and Nail, Inc. Soupapes et circuit de carburant de chambre de combustion pour outil manuel de scellement entraine
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
US12395046B2 (en) 2022-07-22 2025-08-19 Techtronic Cordless Gp Firmware control providing a soft stop on compression drive nailer

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Also Published As

Publication number Publication date
US20190001474A1 (en) 2019-01-03
CN108025426A (zh) 2018-05-11
US10759032B2 (en) 2020-09-01
EP3141348A1 (fr) 2017-03-15
WO2017045971A1 (fr) 2017-03-23
EP3349945A1 (fr) 2018-07-25
CN108025426B (zh) 2021-05-04

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