EP3233379A1 - Drive-in device with adjustable combustion chamber - Google Patents

Drive-in device with adjustable combustion chamber

Info

Publication number
EP3233379A1
EP3233379A1 EP15813761.2A EP15813761A EP3233379A1 EP 3233379 A1 EP3233379 A1 EP 3233379A1 EP 15813761 A EP15813761 A EP 15813761A EP 3233379 A1 EP3233379 A1 EP 3233379A1
Authority
EP
European Patent Office
Prior art keywords
combustion chamber
spring
central axis
movable
chamber wall
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
EP15813761.2A
Other languages
German (de)
French (fr)
Other versions
EP3233379B1 (en
Inventor
Markus Woerner
Thomas Sperrfechter
Peter STAUSS-REINER
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 EP3233379A1 publication Critical patent/EP3233379A1/en
Application granted granted Critical
Publication of EP3233379B1 publication Critical patent/EP3233379B1/en
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.
  • Combustion chamber has a movable combustion chamber wall, wherein an actuating rod is guided by means of a passage through a housing of the combustion chamber and is connected to the movable combustion chamber wall.
  • the movable combustion chamber wall is force-urged by a spring in the axial direction, wherein a force vector of the spring force coincides with a center axis of the combustion chamber.
  • the movable combustion chamber wall of the combustion chamber generally allows the combustion chamber to be collapsed, for example, as part of a safety device, if the device is not properly seated on a workpiece.
  • the combustion chamber is clamped before each setting process by the placement, so that in each case a StudentsstMail the fixed combustion chamber wall takes place.
  • the spring between the movable combustion chamber wall and the housing presses the movable combustion chamber wall in the driving direction, so that in the absence of corresponding counterforces, the combustion chamber is collapsed.
  • the force vector of the spring is understood to mean a vector which corresponds in length, direction and point of application to the effect of the spring on the ground. In the case of the previously known structural solutions, the force vector in each case engages in the middle of the floor or runs on the center axis of the combustion chamber.
  • Unfavorable tilting moments acting on the movable combustion chamber wall can have different causes.
  • the tilting moments can be caused by an actuating mechanism acting on the ground.
  • the movable combustion chamber wall can also experience a moment by the targeted pressure on spring-loaded elements.
  • Such an element may be, for example, a gas valve, a safety switch or the like.
  • a pressure on a vortexing vortex plate can exercise a tilting moment on the ground.
  • the positioning of the spring or the force vector is chosen so that the influence of all moments on the movable combustion chamber wall is optimally compensated.
  • the offset is at least one tenth of a radius of the movable combustion chamber wall. Particularly preferably, the offset is at least one fifth of a radius of the movable combustion chamber wall. This makes it possible to compensate for particularly large tilting moments.
  • Aufsetzglied is arranged on the tacker, wherein the embarksetzglied is connected via a linkage with the adjustable bottom.
  • a Aufsetzglied serves as a reliable safety device in the operation of the tacker.
  • the attachment member may be formed, for example, as a sleeve arranged concentrically to a central axis of the device. Alternatively, it may be, for example, a laterally offset to the central axis arranged exposure.
  • the linkage is force-decoupled in a direction perpendicular to the central axis.
  • a force transmission point in the region of the force decoupling lies substantially in a line with the force vector of the spring.
  • a force decoupling in the present sense is understood to mean that in at least one plane between a front attachment point of the attachment member and the adjustable bottom there is such a separation of the linkage that no force is transmitted in the direction perpendicular to the central axis. This generally has an effect on a tilting moment that ultimately puts the linkage on the ground.
  • the linkage comprises only a movable control rod, which passes through a passage in the combustion chamber and is connected to the adjustable bottom. This can then be arranged so that it does not adversely affect the main dimensions of the device. This ensures the accessibility of the device in narrow areas.
  • the compensation of a torque according to the invention is particularly advantageous, since a tilting of the control rod in the implementation can be avoided.
  • Fig. 1 shows an overall view of a Eintreibös invention with cut open combustion chamber.
  • FIG. 2 shows a plan view of parts of the device of FIG. 1 from the side
  • Fig. 3 shows a plan view of parts of the device of FIG. 1 from above.
  • Fig. 4 shows a sectional view of the combustion chamber of the apparatus of Fig. 1 from the side in a collapsed state.
  • Fig. 5 shows a sectional view of the combustion chamber of the apparatus of Fig. 1 from the side in a clamped state.
  • the tacker of Fig. 1 is a hand-held device comprising a housing 1 and a combustion chamber 2 received therein with a partially cylindrical combustion chamber wall. Adjacent to the combustion chamber 2 is a cylinder 3 with a guided therein driving piston 4.
  • a safety mechanism of the device comprises a Tarsetzglied in the form of a Materials toetzhülse 5, which is placed on a workpiece (not shown) and is pressed against the pressure of a spring 8. Only in this state, a driving operation can be triggered by igniting a fuel gas in the combustion chamber 2.
  • a swirl plate 6 is also arranged, which can be moved by an actuating rod 6a through the combustion chamber 2 before ignition.
  • a movable combustion chamber wall 7 of the combustion chamber 2 is movable along an axis A coinciding with the driving direction, so that the volume of the combustion chamber is variable.
  • the bottom 7 is supported for this purpose with the spring 8 against a rear wall 1 a of the outer housing 1.
  • the spring 8 exerts a force vector F on the movable combustion chamber wall 7.
  • the spring 8 designed as a helical spring is not arranged concentrically with respect to the axis A.
  • the force vector F of the spring 8 extends parallel to the axis A, but engages radially offset by an offset V to the central axis A to the movable combustion chamber wall 7 at.
  • the magnitude of the offset V is presently about 23% of a radius of the movable combustion chamber wall 7 and the combustion chamber 2.
  • the length of the force vector F varies according to the respective voltage of the spring 8.
  • the force vector F does not run next to the combustion chamber, but covered in the Central axis perpendicular plane with the cross section of the combustion chamber 2.
  • the spring 8 is supported directly on the back of the movable combustion chamber wall 7.
  • the movable combustion chamber wall 7 can be moved via the linkage 10 in the direction of the axis, wherein both the linkage 10 and the control rod 9 passes through a passage 10a or 9a in a front, second bottom of the combustion chamber.
  • the impressions of the attachment sleeve 5 acts on the linkage 10, which in turn displaces the movable combustion chamber wall 7 against the force of the spring 8.
  • the linkage 10 and the control rod 9 extend within the combustion chamber parallel to the axis A, but are laterally offset.
  • the linkage 10 and the control rod 9 also extend laterally offset to the force vector F.
  • the control rod 9 is part of the Anpresssystems, it is connected by the movable combustion chamber wall 7 with the linkage 10, which in turn is connected to the landing member.
  • the attachment member 5 is sleeve-shaped and arranged concentrically around the axis A in the region of its abutment on the workpiece.
  • An integrally formed extension 5a protrudes laterally and supports the attachment member 5 in a power transmission point 1 1 against the linkage 10 from.
  • a force of the attachment sleeve is transmitted to a direction parallel only to the central axis, on the other hand, only in the linkage direction. In the direction perpendicular thereto is a free play in the power transmission point 1 1, so that there is a force decoupling in these directions.
  • the further linkage 10 is formed without Kraftentkoppelept and therefore also transmits moments.
  • the decoupling in the power transmission point 1 1 allows in particular the whereabouts of the bolt guide on the workpiece during the return of the device as a result of combustion. It also allows the simple design of an actuator 12 in the field of Aufsetzgliedes 5. By means of the actuator 12, the stop depth of the Aufsetzgliedes 5 is adjustable.
  • the control rod 9 is connected to the bottom 7 torque-resistant.
  • the linkage 10 is in turn momentarily connected to the bottom 7.
  • the force vector F of the force vector is approximately or substantially on a line parallel to the central axis line with the power transmission point 1 first
  • the position of the force vector F and the spring 8 may still be fine-corrected. This takes place taking into account further forces exerting a moment on the adjustable combustion chamber wall 7.
  • Such additional forces can be generated, for example, by an inlet and outlet valve 13 mechanically connected to the movable combustion chamber wall 7, a safety switch (not shown) or the spring of the swirl plate 6 prestressed by the rod 10.
  • the various forces which exert a tilting moment on the movable combustion chamber wall 7 depend on the position of the movable combustion chamber wall 7 or the respective operating state. Therefore, a complete compensation of all moments is generally not always achievable.
  • the location of the force vector F can be chosen such that the maximum tilting moments acting on the ground are minimized during operation. As a result, jamming or friction of the movable combustion chamber wall 7 is effectively reduced in the course of its adjustment.

Landscapes

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

Abstract

The invention relates to a drive-in device, comprising a drive-in piston (4) which is guided in a cylinder (3) for driving a nail element into a workpiece and comprising a combustion chamber (2) which is arranged over the drive-in piston (4) and which can be filled with a combustion gas, said combustion chamber (2) comprising a cylindrical portion which is symmetrical about a central axis (A). A movable combustion chamber wall (7) of the combustion chamber (2) can be adjusted along the central axis (A), and a spring (8) is supported between the movable combustion chamber wall (7) and a housing (1a). A force vector (F) of the spring (8) has a lateral offset (V) with respect to the central axis (A).

Description

Eintreibgerät mit verstellbarer Brennkammer  A tacker with adjustable combustion chamber
Die Erfindung betrifft ein Eintreibgerät, insbesondere ein handgeführtes Eintreibgerät, nach dem Oberbegriff des Anspruchs 1. The invention relates to a tacker, in particular a hand-held tacker, according to the preamble of claim 1.
DE 102 26 878 A1 beschreibt ein Eintreibgerät zum Eintreiben eines Nagels in ein DE 102 26 878 A1 describes a tacker for driving a nail into a
Werkstück, bei dem eine Brennkammer mit einem Brenngas beschickt wird, wobei nach einem Zündvorgang ein Eintreibkolben gegen den Nagel beschleunigt wird. Die Workpiece in which a combustion chamber is charged with a fuel gas, wherein after a firing operation, a driving piston is accelerated against the nail. The
Brennkammer hat eine bewegliche Brennraumwand, wobei eine Stellstange mittels einer Durchführung durch ein Gehäuse der Brennkammer geführt ist und mit der beweglichen Brennraumwand verbunden ist. Die bewegliche Brennraumwand ist durch eine Feder in axialer Richtung kraftbeaufschlagt, wobei ein Kraftvektor der Federkraft mit einer Mittelachse der Brennkammer zusammenfällt. Combustion chamber has a movable combustion chamber wall, wherein an actuating rod is guided by means of a passage through a housing of the combustion chamber and is connected to the movable combustion chamber wall. The movable combustion chamber wall is force-urged by a spring in the axial direction, wherein a force vector of the spring force coincides with a center axis of the combustion chamber.
Es ist die Aufgabe der Erfindung, ein Eintreibgerät anzugeben, das einen besonders zuverlässigen Betrieb ermöglicht. It is the object of the invention to provide a tacker that allows a particularly reliable operation.
Diese Aufgabe wird für ein eingangs genanntes Eintreibgerät erfindungsgemäß mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Durch die außermittige Anordnung der Feder bzw. des Kraftvektors der Feder kann ein maximales Kippmoment der beweglichen Brennraumwand um eine radial gerichtete Achse verringert werden. Hierdurch wird das Verschieben des Bodens insgesamt leichtgängiger und die Gefahr eines Verklemmens in Verbindung mit weiteren Einflüssen (Verschmutzung, Vereisung etc.) wird verringert. This object is achieved according to the invention for a drive-in device mentioned above with the characterizing features of claim 1. Due to the eccentric arrangement of the spring or the force vector of the spring, a maximum tilting moment of the movable combustion chamber wall can be reduced by a radially directed axis. As a result, the displacement of the soil is generally smoother and the risk of jamming in conjunction with other influences (pollution, icing, etc.) is reduced.
Die bewegliche Brennraumwand der Brennkammer erlaubt es allgemein, dass die Brennkammer zum Beispiel als Teil einer Sicherheitseinrichtung kollabiert werden kann, wenn das Gerät nicht ordnungsgemäß auf ein Werkstück aufgesetzt ist. Bei solchen Geräten wird die Brennkammer vor jedem Setzvorgang durch das Aufsetzen aufgespannt, so dass jeweils ein Überstreifen der festen Brennkammerwand erfolgt. Die Feder zwischen der beweglichen Brennkammerwand und dem Gehäuse drückt die bewegliche Brennkammerwand in Eintreibrichtung, so dass bei Fehlen entsprechender Gegenkräfte die Brennkammer kollabiert wird. Unter dem Kraftvektor der Feder wird dabei ein Vektor verstanden, der in Länge, Richtung und Angriffspunkt der Wirkung der Feder auf den Boden entspricht. Bei den vorbekannten konstruktiven Lösungen greift der Kraftvektor dabei jeweils in der Mitte des Bodens an bzw. verläuft auf der Mittelachse der Brennkammer. The movable combustion chamber wall of the combustion chamber generally allows the combustion chamber to be collapsed, for example, as part of a safety device, if the device is not properly seated on a workpiece. In such devices, the combustion chamber is clamped before each setting process by the placement, so that in each case a Überstreifen the fixed combustion chamber wall takes place. The spring between the movable combustion chamber wall and the housing presses the movable combustion chamber wall in the driving direction, so that in the absence of corresponding counterforces, the combustion chamber is collapsed. The force vector of the spring is understood to mean a vector which corresponds in length, direction and point of application to the effect of the spring on the ground. In the case of the previously known structural solutions, the force vector in each case engages in the middle of the floor or runs on the center axis of the combustion chamber.
Ungünstige, an der beweglichen Brennkammerwand angreifende Kippmomente können verschiedene Ursachen haben. Insbesondere können die Kippmomente durch eine an dem Boden angreifende Stellmechanik verursacht werden. Zudem kann die bewegliche Brennraumwand aber auch durch den gezielten Andruck an federbelasteten Elementen ein Moment erfahren. Ein solches Element kann zum Beispiel ein Gasventil, ein Sicherheitsschalter oder Ähnliches sein. Auch ein Andruck an eine rückzustellende Wirbelplatte kann ein Kippmoment auf den Boden ausüben. Allgemein vorteilhaft ist die Positionierung der Feder bzw. des Kraftvektors so gewählt, dass der Einfluss sämtlicher Momente auf die bewegliche Brennraumwand möglichst optimal kompensiert ist. Unfavorable tilting moments acting on the movable combustion chamber wall can have different causes. In particular, the tilting moments can be caused by an actuating mechanism acting on the ground. In addition, the movable combustion chamber wall can also experience a moment by the targeted pressure on spring-loaded elements. Such an element may be, for example, a gas valve, a safety switch or the like. Also, a pressure on a vortexing vortex plate can exercise a tilting moment on the ground. Generally advantageous, the positioning of the spring or the force vector is chosen so that the influence of all moments on the movable combustion chamber wall is optimally compensated.
Bei einer bevorzugten Ausführungsform der Erfindung beträgt der Versatz wenigstens ein Zehntel eines Radius der beweglichen Brennraumwand. Besonders bevorzugt beträgt der Versatz wenigstens ein Fünftel eines Radius der beweglichen Brennraumwand. Hierdurch lassen sich besonders große Kippmomente kompensieren. In a preferred embodiment of the invention, the offset is at least one tenth of a radius of the movable combustion chamber wall. Particularly preferably, the offset is at least one fifth of a radius of the movable combustion chamber wall. This makes it possible to compensate for particularly large tilting moments.
Bei einer allgemein bevorzugten Ausführungsform der Erfindung ist ein federbelastetes und in Richtung der Mittelachse eindrückbares Aufsetzglied an dem Eintreibgerät angeordnet, wobei das Aufsetzglied über ein Gestänge mit dem verstellbaren Boden verbunden ist. Ein solches Aufsetzglied dient als zuverlässige Sicherheitseinrichtung im Betrieb des Eintreibgerätes. Das Aufsetzglied kann zum Beispiel als eine konzentrisch zu einer Mittelachse des Gerätes angeordnete Hülse ausgebildet sein. Alternativ hierzu kann es sich zum Beispiel auch um eine seitlich zu der Mittelachse versetzt angeordnetes Aussetzteil handeln. ln bevorzugter Detailgestaltung ist das Gestänge dabei in einer zur der Mittelachse senkrechten Richtung kraftentkoppelt. Dies erlaubt eine besonders flexible Konstruktion des Aufsetzgliedes. Ausserdem erlaubt ein Verbleiben des Aufsetzglieds auf dem Untergrund beim Rücksprung des Geräts im Rahmen einer Setzung und verbessert die Befestigungsqualität. Besonders bevorzugt ist es vorgesehen, dass ein Kraftübertragungspunkt im Bereich der Kraftentkopplung im Wesentlichen in einer Linie mit dem Kraftvektor der Feder liegt. Unter einer Kraftentkopplung wird im vorliegenden Sinn verstanden, dass in zumindest einer Ebene zwischen einem vorderen Aufsetzpunkt des Aufsetzgliedes und dem verstellbaren Boden eine derartige Trennung des Gestänges vorliegt, dass in der zu der Mittelachse senkrechten Richtung keine Kraftübertragung erfolgt. Dies hat im Allgemeinen Auswirkungen auf ein Kippmoment, das das Gestänge letztlich auf den Boden ausübt. Insbesondere folgt daraus, dass die von einer um die Mittelachse symmetrisch angeordneten Aufsetzhülse mittels des Gestänges auf den Boden übertragene Kraft relativ zur Mittelachse nicht momentfrei ist. Das resultierende Moment kann im Sinne der Erfindung ideal über die dezentral angeordnete Feder kompensiert werden. In a generally preferred embodiment of the invention, a spring-loaded and can be pressed in the direction of the central axis Aufsetzglied is arranged on the tacker, wherein the Aufsetzglied is connected via a linkage with the adjustable bottom. Such a Aufsetzglied serves as a reliable safety device in the operation of the tacker. The attachment member may be formed, for example, as a sleeve arranged concentrically to a central axis of the device. Alternatively, it may be, for example, a laterally offset to the central axis arranged exposure. In a preferred detailed design, the linkage is force-decoupled in a direction perpendicular to the central axis. This allows a particularly flexible construction of the Aufsetzgliedes. In addition, allowing the Aufsetzglieds on the substrate during the return of the device in the context of a settlement allows and improves the quality of attachment. Particularly preferably, it is provided that a force transmission point in the region of the force decoupling lies substantially in a line with the force vector of the spring. A force decoupling in the present sense is understood to mean that in at least one plane between a front attachment point of the attachment member and the adjustable bottom there is such a separation of the linkage that no force is transmitted in the direction perpendicular to the central axis. This generally has an effect on a tilting moment that ultimately puts the linkage on the ground. In particular, it follows that the force transmitted symmetrically from a centering axis to the attachment sleeve by means of the linkage to the ground is not torque-free relative to the central axis. The resulting moment can be ideally compensated in the sense of the invention via the decentrally arranged spring.
Im Interesse einer raumsparenden Bauweise ist es bevorzugt vorgesehen, dass das Gestänge nur eine bewegbare Stellstange umfasst, die eine Durchführung in der Brennkammer durchgreift und mit dem verstellbaren Boden verbunden ist. Diese kann dann so angeordnet werden, dass sie die Hauptabmessungen des Geräts nicht negativ beeinflusst. Damit wird die Zugänglichkeit des Geräts in enge Bereiche sichergestellt. Bei einer solchen Ausführung ist die erfindungsgemäße Kompensation eines Moments besonders vorteilhaft, da auch eine Verkippung der Stellstange in der Durchführung vermieden werden kann. In the interest of a space-saving design, it is preferably provided that the linkage comprises only a movable control rod, which passes through a passage in the combustion chamber and is connected to the adjustable bottom. This can then be arranged so that it does not adversely affect the main dimensions of the device. This ensures the accessibility of the device in narrow areas. In such an embodiment, the compensation of a torque according to the invention is particularly advantageous, since a tilting of the control rod in the implementation can be avoided.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus dem nachfolgend beschriebenen Ausführungsbeispiel sowie aus den abhängigen Ansprüchen. Further advantages and features of the invention will become apparent from the embodiment described below and from the dependent claims.
Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung beschrieben und anhand der anliegenden Zeichnungen näher erläutert. Hereinafter, a preferred embodiment of the invention will be described and explained in more detail with reference to the accompanying drawings.
Fig. 1 zeigt eine räumliche Gesamtansicht eines erfindungsgemäßen Eintreibgerätes mit aufgeschnittener Brennkammer. Fig. 1 shows an overall view of a Eintreibgerätes invention with cut open combustion chamber.
Fig. 2 zeigt eine Draufsicht auf Teile des Gerätes aus Fig. 1 von der Seite,  2 shows a plan view of parts of the device of FIG. 1 from the side,
Fig. 3 zeigt eine Draufsicht auf Teile des Gerätes aus Fig. 1 von oben. Fig. 4 zeigt eine Schnittansicht der Brennkammer des Gerätes aus Fig. 1 von der Seite in einem kollabiertem Zustand. Fig. 3 shows a plan view of parts of the device of FIG. 1 from above. Fig. 4 shows a sectional view of the combustion chamber of the apparatus of Fig. 1 from the side in a collapsed state.
Fig. 5 zeigt eine Schnittansicht der Brennkammer des Gerätes aus Fig. 1 von der Seite in einem aufgespanntem Zustand.  Fig. 5 shows a sectional view of the combustion chamber of the apparatus of Fig. 1 from the side in a clamped state.
Das Eintreibgerät aus Fig. 1 ist ein handgeführtes Gerät, umfassend ein Gehäuse 1 und eine darin aufgenommene Brennkammer 2 mit einer abschnittsweise zylindrischen Brennkammerwand. An die Brennkammer 2 grenzt ein Zylinder 3 mit einem darin geführten Eintreibkolben 4 an. The tacker of Fig. 1 is a hand-held device comprising a housing 1 and a combustion chamber 2 received therein with a partially cylindrical combustion chamber wall. Adjacent to the combustion chamber 2 is a cylinder 3 with a guided therein driving piston 4.
Eine Sicherheitsmechanik des Gerätes umfasst ein Aufsetzglied in Form einer Aufsetzhülse 5, die auf ein Werkstück (nicht dargestellt) aufgesetzt wird und gegen den Druck einer Feder 8 eingedrückt wird. Nur in diesem Zustand kann ein Eintreibvorgang durch Zünden eines Brenngases in der Brennkammer 2 ausgelöst werden. A safety mechanism of the device comprises a Aufsetzglied in the form of a Aufsetzhülse 5, which is placed on a workpiece (not shown) and is pressed against the pressure of a spring 8. Only in this state, a driving operation can be triggered by igniting a fuel gas in the combustion chamber 2.
In der Brennkammer 2 ist zudem eine Wirbelplatte 6 angeordnet, die vor einer Zündung mittels einer Stellstange 6a durch die Brennkammer 2 bewegt werden kann. Eine bewegliche Brennraumwand 7 der Brennkammer 2 ist entlang einer mit der Eintreibrichtung zusammenfallenden Achse A bewegbar, so dass das Volumen der Brennkammer veränderlich ist. Der Boden 7 ist hierzu mit der Feder 8 gegenüber einer hinteren Wand 1 a des äußeren Gehäuses 1 abgestützt. Die Feder 8 übt einen Kraftvektor F auf die bewegliche Brennraumwand 7 aus. Die als Schraubenfeder ausgebildete Feder 8 ist nicht konzentrisch zu der Achse A angeordnet. Der Kraftvektor F der Feder 8 verläuft parallel zu der Achse A, greift aber radial um einen Versatz V zu der Mittelachse A versetzt an der beweglichen Brennraumwand 7 an. Die Größe des Versatzes V beträgt vorliegend etwa 23% eines Radius der beweglichen Brennraumwand 7 bzw. der Brennkammer 2. Die Länge des Kraftvektors F variiert entsprechend der jeweiligen Spannung der Feder 8. Der Kraftvektor F verläuft nicht neben der Brennkammer, sondern überdeckt in der zur Mittelachse senkrechten Ebene mit dem Querschnitt der Brennkammer 2. Die Feder 8 ist unmittelbar auf der Rückseite der beweglichen Brennraumwand 7 abgestützt. Die bewegliche Brennraumwand 7 kann über das Gestänge 10 in Richtung der Achse bewegt werden, wobei sowohl das Gestänge 10 als auch die Stellstange 9 eine Durchführung 10a bzw. 9a in einem vorderen, zweiten Boden der Brennkammer durchgreift. Das Eindrücken der Aufsetzhülse 5 wirkt auf das Gestänge 10 , welche wiederum die bewegliche Brennraumwand 7 gegen die Kraft der Feder 8 verschiebt. Hierdurch wird ein für eine Zündung ausreichendes Volumen der Brennkammer erst aufspannt. Das Gestänge 10 und die Stellstange 9 verlaufen innerhalb der Brennkammer parallel zu der Achse A, sind aber seitlich versetzt. Das Gestänge 10 und die Stellstange 9 verlaufen zudem seitlich versetzt zu dem Kraftvektor F. In the combustion chamber 2, a swirl plate 6 is also arranged, which can be moved by an actuating rod 6a through the combustion chamber 2 before ignition. A movable combustion chamber wall 7 of the combustion chamber 2 is movable along an axis A coinciding with the driving direction, so that the volume of the combustion chamber is variable. The bottom 7 is supported for this purpose with the spring 8 against a rear wall 1 a of the outer housing 1. The spring 8 exerts a force vector F on the movable combustion chamber wall 7. The spring 8 designed as a helical spring is not arranged concentrically with respect to the axis A. The force vector F of the spring 8 extends parallel to the axis A, but engages radially offset by an offset V to the central axis A to the movable combustion chamber wall 7 at. The magnitude of the offset V is presently about 23% of a radius of the movable combustion chamber wall 7 and the combustion chamber 2. The length of the force vector F varies according to the respective voltage of the spring 8. The force vector F does not run next to the combustion chamber, but covered in the Central axis perpendicular plane with the cross section of the combustion chamber 2. The spring 8 is supported directly on the back of the movable combustion chamber wall 7. The movable combustion chamber wall 7 can be moved via the linkage 10 in the direction of the axis, wherein both the linkage 10 and the control rod 9 passes through a passage 10a or 9a in a front, second bottom of the combustion chamber. The impressions of the attachment sleeve 5 acts on the linkage 10, which in turn displaces the movable combustion chamber wall 7 against the force of the spring 8. As a result, sufficient for an ignition volume of the combustion chamber is only opened. The linkage 10 and the control rod 9 extend within the combustion chamber parallel to the axis A, but are laterally offset. The linkage 10 and the control rod 9 also extend laterally offset to the force vector F.
Die Stellstange 9 ist Teil des Anpresssystems, es wird von der beweglichen Brennraumwand 7 mit dem Gestänge 10 verbunden, welches wiederum mit dem Aufsetzglied verbunden ist. Das Aufsetzglied 5 ist im Bereich seiner Anlage an dem Werkstück hülsenförmig und konzentrisch um die Achse A angeordnet. Ein einstückig ausgebildeter Fortsatz 5a ragt seitlich vor und stützt das Aufsetzglied 5 in einem Kraftübertragungspunkt 1 1 gegen das Gestänge 10 ab. In diesem Kraftübertragungspunkt 1 1 wird eine Kraft der Aufsetzhülse zum einen nur in zu der Mittelachse paralleler Richtung, zum anderen nur in dem Gestänge zugewandter Richtung übertragen. In dazu senkrechter Richtung liegt ein freies Spiel im Kraftübertragungspunkt 1 1 vor, so dass in diesen Richtungen eine Kraftentkoppelung vorliegt. Das weitere Gestänge 10 ist ohne Kraftentkoppelungen ausgebildet und überträgt daher auch Momente. The control rod 9 is part of the Anpresssystems, it is connected by the movable combustion chamber wall 7 with the linkage 10, which in turn is connected to the landing member. The attachment member 5 is sleeve-shaped and arranged concentrically around the axis A in the region of its abutment on the workpiece. An integrally formed extension 5a protrudes laterally and supports the attachment member 5 in a power transmission point 1 1 against the linkage 10 from. In this power transmission point 1 1, a force of the attachment sleeve is transmitted to a direction parallel only to the central axis, on the other hand, only in the linkage direction. In the direction perpendicular thereto is a free play in the power transmission point 1 1, so that there is a force decoupling in these directions. The further linkage 10 is formed without Kraftentkoppelungen and therefore also transmits moments.
Die Entkoppelung im Kraftübertragungspunkt 1 1 erlaubt insbesondere den Verbleib der Bolzenführung auf dem Werkstück beim Rücksprung des Geräts in Folge der Verbrennung. Auch erlaubt es die einfache Ausbildung eines Stellgliedes 12 im Bereich des Aufsetzgliedes 5. Mittels des Stellgliedes 12 ist die Anschlagtiefe des Aufsetzgliedes 5 einstellbar. The decoupling in the power transmission point 1 1 allows in particular the whereabouts of the bolt guide on the workpiece during the return of the device as a result of combustion. It also allows the simple design of an actuator 12 in the field of Aufsetzgliedes 5. By means of the actuator 12, the stop depth of the Aufsetzgliedes 5 is adjustable.
Aufgrund der besseren Übersicht sind in den Zeichnungen Teile des Gestänges 10 nicht dargestellt. Insbesondere ist die Stellstange 9 mit dem Boden 7 momentenfest verbunden. Das Gestänge 10 ist seinerseits momentfest mit dem Boden 7 verbunden. Für eine momentarme Abstützung der beweglichen Brennraumwand 7 durch die Feder 8 bzw. den Kraftvektor F liegt der Kraftvektor annähernd bzw. im Wesentlichen auf einer zu der Mittelachse parallelen Linie mit dem Kraftübertragungspunkt 1 1. Zur weiteren Verringerung eines maximalen, an der verstellbaren Brennraumwand 7 angreifenden Kippmomentes kann die Position des Kraftvektors F bzw. der Feder 8 noch feinkorrigiert sein. Dies erfolgt unter Berücksichtigung weiterer Kräfte, die ein Moment auf die verstellbare Brennraumwand 7 ausüben. Due to the better overview, parts of the linkage 10 are not shown in the drawings. In particular, the control rod 9 is connected to the bottom 7 torque-resistant. The linkage 10 is in turn momentarily connected to the bottom 7. For a moment-poor support of the movable combustion chamber wall 7 by the spring 8 and the force vector F of the force vector is approximately or substantially on a line parallel to the central axis line with the power transmission point 1 first To further reduce a maximum, acting on the adjustable combustion chamber wall 7 tilting moment, the position of the force vector F and the spring 8 may still be fine-corrected. This takes place taking into account further forces exerting a moment on the adjustable combustion chamber wall 7.
Solche weiteren Kräfte können zum Beispiel durch ein mit der beweglichen Brennraumwand 7 mechanisch verbundenes Ein- und Auslassventil 13, einen Sicherheitsschalter (nicht dargestellt) oder die vom Gestänge 10 vorgespannte Feder der Wirbelplatte 6 erzeugt werden. Such additional forces can be generated, for example, by an inlet and outlet valve 13 mechanically connected to the movable combustion chamber wall 7, a safety switch (not shown) or the spring of the swirl plate 6 prestressed by the rod 10.
Im Regelfall sind die verschiedenen Kräfte, die ein Kippmoment auf die bewegliche Brennraumwand 7 ausüben, von der Position der beweglichen Brennraumwand 7 oder dem jeweiligen Betriebszustand abhängig. Daher ist allgemein nicht immer eine vollständige Kompensation sämtlicher Momente erreichbar. Im Sinne der Erfindung kann aber der Ort des Kraftvektors F so gewählt werden, dass die am Boden angreifenden maximalen Kippmomente im Betrieb minimiert werden. Hierdurch wird ein Verklemmen oder eine Reibung der beweglichen Brennraumwand 7 im Zuge seiner Verstellung wirksam reduziert. As a rule, the various forces which exert a tilting moment on the movable combustion chamber wall 7 depend on the position of the movable combustion chamber wall 7 or the respective operating state. Therefore, a complete compensation of all moments is generally not always achievable. For the purposes of the invention, however, the location of the force vector F can be chosen such that the maximum tilting moments acting on the ground are minimized during operation. As a result, jamming or friction of the movable combustion chamber wall 7 is effectively reduced in the course of its adjustment.

Claims

PATENTANSPRUECHE cLAIMS
1 . Eintreibgerät, umfassend einen in einem Zylinder (3) geführten Eintreibkolben (4) zum Eintreiben eines Nagelglieds in ein Werkstück, und eine über dem Eintreibkolben (4) angeordnete Brennkammer (2), die mit einem Brenngas befüllbar ist, wobei die Brennkammer (2) einen um eine Mittelachse (A) symmetrischen, zylindrischen Abschnitt umfasst, wobei eine bewegliche Brennraumwand (7) der Brennkammer (2) entlang der Mittelachse (A) verstellbar ist, und wobei eine Feder (8) zwischen dem verstellbaren Boden (7) und einem Gehäuse (1 a) abgestützt ist, dadurch gekennzeichnet, dass ein Kraftvektor (F) der Feder (8) einen seitlichen Versatz (V) zu der Mittelachse (A) aufweist. 1 . A tacker, comprising a driving piston (4) guided in a cylinder (3) for driving a nail member into a workpiece, and a combustion chamber (2) arranged above the driving piston (4), which can be filled with a fuel gas, wherein the combustion chamber (2) a cylindrical section symmetrical about a central axis (A), a movable combustion chamber wall (7) of the combustion chamber (2) being adjustable along the central axis (A), and a spring (8) between the adjustable bottom (7) and a Housing (1 a) is supported, characterized in that a force vector (F) of the spring (8) has a lateral offset (V) to the central axis (A).
2. Eintreibgerät nach Anspruch 1 , dadurch gekennzeichnet, dass der Versatz (V) wenigstens ein Zehntel eines Radius des Bodens (7) beträgt. 2. A tacker according to claim 1, characterized in that the offset (V) is at least one tenth of a radius of the bottom (7).
3. Eintreibgerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein federbelastetes und in Richtung der Mittelachse (A) eindrückbares Aufsetzglied (5) an dem Eintreibgerät angeordnet ist, wobei das Aufsetzglied (5) über ein Gestänge (10) mit der beweglichen Brennraumwand (7) verbunden ist. 3. A tacker according to any one of the preceding claims, characterized in that a spring-loaded and in the direction of the central axis (A) can be pressed Aufsetzglied (5) on the tacker, wherein the Aufsetzglied (5) via a linkage (10) with the movable combustion chamber wall (7) is connected.
4. Eintreibgerät nach Anspruch 3, dadurch gekennzeichnet, dass das Gestänge (10) in einer zur der Mittelachse senkrechten Richtung kraftentkoppelt ist. 4. tacker according to claim 3, characterized in that the linkage (10) is decoupled in a direction perpendicular to the central axis direction.
5. Eintreibgerät nach Anspruch 4, dadurch gekennzeichnet, dass ein Kraftübertragungspunkt (1 1 ) im Bereich der Kraftentkopplung im Wesentlichen in einer Linie mit dem Kraftvektor (F) der Feder (8) liegt. 5. A tacker according to claim 4, characterized in that a force transmission point (1 1) in the region of the force decoupling is substantially in line with the force vector (F) of the spring (8).
6. Eintreibgerät nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass das Gestänge (10) eine bewegbare Stellstange (9) umfasst, die eine Durchführung (9a) in der Brennkammer (2) durchgreift und mit der beweglichen Brennraumwand (7) verbunden ist. 6. A tacker according to one of claims 3 to 5, characterized in that the linkage (10) comprises a movable control rod (9) which passes through a passage (9a) in the combustion chamber (2) and connected to the movable combustion chamber wall (7) is.
EP15813761.2A 2014-12-19 2015-12-15 Driving device with adjustable combustion chamber Active EP3233379B1 (en)

Applications Claiming Priority (2)

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EP14199196.8A EP3034238A1 (en) 2014-12-19 2014-12-19 Driving device with adjustable combustion chamber
PCT/EP2015/079728 WO2016096807A1 (en) 2014-12-19 2015-12-15 Drive-in device with adjustable combustion chamber

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US20170348840A1 (en) 2017-12-07
EP3233379B1 (en) 2018-09-19
EP3034238A1 (en) 2016-06-22
WO2016096807A1 (en) 2016-06-23

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