EP3090836A1 - Tool for driving fixation means with improved safety device - Google Patents

Abstract

Driving tool (1) for driving fasteners (90) into a workpiece (91), the tool (1) having in particular: - a safety device (8), which is coupled to the trigger element (6) and is set up, after expiry (820) of a delay time emanating from an activation (810) of the safety device (8), to transfer the driving tool (1) from a state ready for deployment (100) to bring about a secured state (101), ª wherein the safety device (8) has a control volume (15). ªª wherein the safety device (8) has an activation element (33) which can be changed between a first and a second position by means of the trigger element (6), wherein in the first position of the activation element (33) a first pneumatic connection is defined between the control volume (15) and the gas pressure source connection (23), which is referred to below as the charging connection (27.1), and wherein in the second position of the activation element (33) a second pneumatic connection is defined between the control volume (15) and a pressure sink (40), which is referred to below as the discharge connection (33.1), one of the charging connection (27.1) and the discharging connection (33.1) having a smallest flow cross-section which, together with a gas pressure from the gas pressure source, determines the delay time of the safety device (8). The invention also relates to a corresponding method for operating a driving tool.

Description

The invention relates to a driving tool for driving fasteners into a workpiece by means of driving cycles, in which a securing device is intended to prevent unintentional triggering when the trigger is actuated after a predetermined time.

A generic driving tool is in valuable contribution to the prior art DE 10 2013 106 657 A1 shown. In this Eintreibwerkzeug a safety device, referred to therein as a reset arrangement, activated by a first Eintreibzyklus, which is performed in the so-called single trip operation there. The safety device transfers the tool to a safe state after a predetermined delay time, provided that the trigger remains depressed and if no drive-in cycle takes place within the delay time.

The EP 2 767 365 A1 relates to a pneumatic nailer, which has, inter alia, a second control valve which is actuated upon actuation of the trigger independently of actuation of the Aufsetzfühlers, a chamber which is either vented or vented via a throttle when driving the second control valve, and a locking piston, the is displaced from a rest position to a blocking position when the pressure in the chamber passes a predetermined pressure threshold, and prevents the triggering of a driving operation in the blocking position.

The inventor found the prior art to be disadvantageous insofar as the flexibility of the use of tools is limited to increase the safety and / or a complicated structural design is necessary. Object of the present invention was to improve the disadvantages of the prior art, in particular to increase the flexibility of the tool use and to ensure a comparable security.

The object is solved by the independent claims. Advantageous developments are defined in the subclaims.

• eine Aktuatoreinheit, mittels der die Befestigungsmittel in Eintreibzyklen in das Werkstück eintreibbar sind,
• eine Auslöseanordnung, mittels der die Eintreibzyklen der Aktuatoreinheit auslösbar sind, wobei die Auslöseanordnung ein Triggerelement aufweist, das handbetätigbar ist und einen Ruhezustand sowie einen gedrückten Zustand aufweist, wobei die Auslöseanordnung weiterhin ein Werkstückkontaktelement aufweist, das durch das Aufsetzen des Eintreibwerkzeugs auf das Werkstück betätigbar ist,
• einen Gasdruckquellenanschluss, an den eine Gasdruckquelle anschließbar ist,
• eine Sicherungseinrichtung, welche mit dem Triggerelement gekoppelt ist und eingerichtet ist, nach Ablauf einer von einer Aktivierung der Sicherungs-einrichtung ausgehenden Verzögerungszeit eine Überführung des Eintreibwerk-zeugs von einem auslösebereiten Zustand in einen gesicherten Zustand zu bewirken,
  • ▪ wobei die Sicherungseinrichtung ein Steuervolumen aufweist,
  • ▪ wobei die Sicherungseinrichtung ein Aktivierungselement aufweist, welches mittels des Triggerelements zwischen einer ersten und einer zweiten Position wechselbar ist, wobei in der ersten Position des Aktivierungselements eine pneumatische Verbindung zwischen dem Steuervolumen und dem Gasdruckquellenanschluss definiert ist, die im Folgenden Ladeverbindung genannt wird,
  und wobei in der zweiten Position des Aktivierungselements eine pneumatische Verbindung zwischen dem Steuervolumen und einer Drucksenke definiert ist, die im Folgenden Entladeverbindung genannt wird,
  wobei, bevorzugt mindestens, eine aus der Ladeverbindung und der Entladeverbindung einen kleinsten Strömungsquerschnitt aufweist, welcher zusammen mit einem Gasdruck der Gasdruckquelle die Verzögerungszeit der Sicherungseinrichtung bestimmt.

In particular, the object is achieved by a driving-in tool for driving fasteners into a workpiece, the tool comprising:

• an actuator unit, by means of which the fastening means in drive-in cycles in the Workpiece can be driven in,
• a trigger arrangement by means of which the drive-in cycles of the actuator unit can be triggered, the trigger arrangement having a trigger element which is manually operable and has an idle state and a pressed state, wherein the trigger arrangement further comprises a workpiece contact element that can be actuated by placing the drive-in tool on the workpiece .
• a gas pressure source connection, to which a gas pressure source can be connected,
• a safety device, which is coupled to the trigger element and is set up to effect a transfer of the drive-in tool from a trigger-ready state into a secured state after the expiry of a delay time which is triggered by activation of the safety device,
  • ▪ wherein the securing device has a control volume,
  • Wherein the securing device has an activation element, which is exchangeable by means of the trigger element between a first and a second position, wherein in the first position of the activation element a pneumatic connection between the control volume and the gas pressure source connection is defined, which is called charging connection in the following,
  and wherein in the second position of the activation element a pneumatic connection between the control volume and a pressure sink is defined, which will be referred to below as the discharge connection,
  wherein, preferably at least, one of the charging connection and the discharge connection has a smallest flow cross-section which, together with a gas pressure of the gas pressure source, determines the delay time of the securing device.

• wobei die Befestigungsmittel mittels einer Aktuatoreinheit in Eintreibzyklen in das Werkstück eingetrieben werden,
• wobei mittels einer Auslöseanordnung die Eintreibzyklen der Aktuatoreinheit ausgelöst werden, wobei ein Triggerelement der Auslöseanordnung handbetätigt wird und dabei von einem Ruhezustand in einen gedrückten Zustand gebracht wird, wobei ein Werkstückkontaktelement durch das Aufsetzen des Eintreibwerkzeugs auf das Werkstück betätigt wird,
• wobei ein Gasdruckquellenanschluss, an eine Gasdruckquelle angeschlossen wird,
• wobei eine mit dem Triggerelement gekoppelte Sicherungseinrichtung nach einer von einer Aktivierung der Sicherungseinrichtung ausgehenden Verzögerungszeit eine Überführung des Eintreibwerkzeugs von einem auslösebereiten Zustand in einen gesicherten Zustand bewirkt,
  indem ein Aktivierungselement mittels des Triggerelements zwischen einer ersten und einer zweiten Position gewechselt wird,
  wobei in der ersten Position des Aktivierungselements eine erste pneumatische Verbindung zwischen dem Steuervolumen und dem Gasdruckquellenanschluss definiert wird, die im Folgenden Ladeverbindung genannt wird,
  und wobei in der zweiten Position des Aktivierungselements eine zweite pneumatische Verbindung zwischen einem Steuervolumen der Sicherheitseinrichtung und einer Drucksenke definiert wird, die im Folgenden Entladeverbindung genannt wird,
  wobei durch, bevorzugt mindestens, eine aus der Ladeverbindung und der Entladeverbindung ein maximale Gasströmung strömt, welche die Verzögerungszeit der Sicherungseinrichtung bestimmt.

The object is further achieved in particular by a method for driving fasteners into a workpiece

• wherein the fastening means are driven into the workpiece by means of an actuator unit in drive-in cycles,
• wherein the triggering cycles of the actuator unit are triggered by means of a triggering arrangement, wherein a trigger element of the triggering arrangement is manually operated and is brought from a rest state into a pressed state, wherein a workpiece contact element is actuated by placing the driving tool on the workpiece,
• wherein a gas pressure source connection is connected to a gas pressure source,
• wherein a security device coupled to the trigger element causes a transfer of the driving tool from a ready-to-release state into a secured state after a delay time which starts from an activation of the security device,
  by changing an activation element between a first and a second position by means of the trigger element,
  wherein in the first position of the activation element a first pneumatic connection between the control volume and the gas pressure source connection is defined, which will be referred to as a charge connection hereinafter,
  and wherein in the second position of the activation element, a second pneumatic connection between a control volume of the safety device and a pressure sink is defined, which is referred to below as the discharge connection,
  wherein through, preferably at least, one of the charging connection and the discharge connection flows a maximum gas flow, which determines the delay time of the securing device.

In contrast to the driving tool mentioned above, the flexibility of the tool use is increased, since the securing device can be activated independently of the state of the workpiece contact element and thus not first a first single trip operation-driving cycle must be made to activate the safety device for the first time. From the beginning, the user can operate the tool in individual trip mode or in contact tripping mode. At the same time a comparable security is obtained since the safety device still transfers the tool to a secured state after a predetermined delay time, so that even if the user inadvertently presses the trigger element before triggering a first drive-in cycle, an unintentional triggering of a drive-in cycle only occurs within the predetermined delay time is possible, but not otherwise. For this purpose, the tool has an activation element, by means of which an activation of the securing device is coupled to the trigger movement, in that the displacement of the activation element by the trigger element is used when the trigger element is pressed to cause an activation of the safety device.

Fasteners include nails, pins or special retractable screws. As a workpiece, for example, wood, metal or concrete into consideration.

The actuator unit is preferably a pneumatic actuator unit, in which the force required for driving force is provided purely from pneumatic energy. The actuator unit preferably has a working piston guided in a working cylinder. The actuator unit preferably has a main triggering valve, preferably a check valve, by means of which the working cylinder can be suddenly filled with compressed air, so that the driving piston is moved in the direction of the tool tip. The working piston is preferably connected to a Eintreibstempel which acts on the einzutreibende fastener. A drive-in cycle is a recurring process that the actuator unit performs to sequentially drive fasteners.

The triggering arrangement preferably has a triggering valve which is coupled purely mechanically via solids (without fluid) to the trigger element. The trigger valve is preferably accommodated in a trigger valve housing, which is separate from the housing of the tool and thus is easily replaceable or retrofittable. Preferably, the activation element is received in the trigger valve housing. The activation element is preferably part of the triggering valve.

In the ready-to-operate state, it is possible for the user to initiate a drive-in cycle - this is not possible for the user in the safe state.

The control volume is preferably an interior of the tool, which is set up for the temporary storage of pneumatic energy. It is preferably arranged directly on the working cylinder of the tool, which includes the working piston, adjacent in the tool. Preferably, it surrounds the lateral surface of the working cylinder at least in a region completely by 360 °. Preferably, the tool has a venting arrangement (e.g., openings in the working cylinder) by means of which the control volume can be filled with compressed air during a driving operation.

The trigger element may e.g. be pivotable or linearly slidable, e.g. a lever or button. It is preferably biased by a spring in the resting state. Preferably, the trigger element is set up (also) to activate the safety device by a change from its idle state to the depressed state when the workpiece contact element is unactuated.

One of the first and the second position of the activation element is preferably an activation position for activating the safety device, ie that a Changing the activation element from the other position into the activation position can start the expiration of a delay time, before then the safety device transfers the tool in the secured state. The activation element is preferably in the activation position when the trigger element is in the depressed state. Preferably, the pneumatic connection of charging connection and discharge connection, which is provided by means of the activation element in the activation position, the compound having the smallest flow cross-section, which determines the delay time together with the gas pressure of the gas pressure source. This connection is preferably the discharge connection, ie via which air flows from the control volume to the pressure sink. Preferably, the discharge connection extends through one, preferably two (preferably in a lateral surface of an activation element designed as a pipe piece) openings of the activation element. Preferably, this opening forms a smallest flow cross-section, which defines the predetermined delay time together with the gas pressure. Preferably, a setting needle is arranged in this opening, which is preferably tapered and thus the flow cross-section of the opening can be changed by moving the needle. Through the needle, a particularly small flow cross-section is achieved, preferably smaller than can be achieved with a conventional drill.

Due to the smallest flow cross-section, one of the charging connection and the discharging connection has a high flow resistance, which enables slow discharging or charging (as the case may be).

Preferably, the securing device is set up to transfer the tool from the secured state into the ready-to-trigger state (and preferably to keep it stable therein) when the tool is connected to a power supply and the trigger element is in its idle state. This defines the triggering state of the tool as the default state, so that the user finds the device in the ready-to-trigger state with the trigger disconnected and the power source connected, and the trip-ready state need not be achieved by a first special drive cycle (e.g., single trip).

An activation of the security device is preferably understood as an activation of a countdown, the countdown running as long as the security device is activated - the security device is preferably deactivated by is reset (either by a drive-in or by the trigger - or in a preferred variant) Fig. 10-12 Trigger element and workpiece contact element - is returned to the idle state) or by the predetermined time has expired. This means that in the activated state of the safety device, a countdown is running, while in the deactivated state no countdown is running. When the safety device is deactivated, the tool can be in the secured or in the ready-to-release state - both are possible.

Preferably, the security device is resettable by a drive-in cycle (wherein the drive-in cycle is only possible as long as the safety device has not yet brought about a transfer of the tool to the secured state) or by a change of the trigger element - or in a preferred variant Fig. 10-12 : Trigger element and workpiece contact element - from the pressed state to its idle state. As a result, the user can keep the device in the ready state by means of each of these two actions. Thus, for example, a continuous operation in the contact cycle can be realized without the trigger must be released and continue the safety device is also reset by releasing the trigger, which also takes place a transfer of the tool in the ready-to-release state, if the tool was in the secure state Has.

In another embodiment of the present invention, the corresponding one of the charging connection and the discharging connection has a larger smallest flow area than the one of the charging connection and the discharging connection. In a further inventive method flows through the corresponding other pneumatic connection at the same applied pressure a stronger gas flow, as in the one connection.

As a result, after the trigger (without causing a trigger) has been kept pressed so long that the safety device has transferred the tool in the secured state, the unsecured state can be resumed faster, ie within a shorter time than the delay time, which eg with a sufficiently large minimum flow cross-section of the other from the charging connection and the discharge connection can even be perceived as instantaneous. Due to the larger smallest flow cross section has the other from the charging connection and the discharge connection to a low flow resistance, which allows a fast discharging or charging (as the case may be).

In a further embodiment of the present invention, the tool comprises a pneumatic line which is both part of the loading connection and part of the discharge connection and which extends from the activation element to the control volume, and wherein the tool further comprises two separate lines, wherein a the separate lines is a part of the charging connection and extends from the activation element to the gas pressure source connection and the other of the separate lines is part of the discharge and extends from the activation element to the pressure sink, wherein the smallest flow cross-section, which together with the gas pressure Delay time of the safety device determined in exactly one of the separate lines is present.

In this way, a Y-configuration is provided, with the activation element as a node, by means of which the different flow cross-sections of discharge and charging connection are structurally advantageous feasible. As an alternative to such a Y-configuration, the tool preferably has a bypass line and the smallest flow cross-section is in the common line and is bridged by means of the bypass line in a position (first and second position) of the activation element or in parallel and in the other Position of the activation element not bridged or connected in parallel, so that in the one position results in a total of a larger flow cross-section than in the other position.

In a further exemplary embodiment of the present invention, the securing device is set up to transfer the tool into the secured state when the pressure falls below a pressure threshold in the control volume. In a further method according to the invention, the tool is correspondingly transferred to the secured state.

As a result, the safety of the tool is further increased because a lower pressure represents a more stable state than a higher pressure and the tool, the stable state aspiring (also generally in case of malfunctions) thus locked more secure, unexpected failures should occur on any components.

In a further embodiment of the present invention, the charging connection is present when the trigger element (and preferably the workpiece contact element) is in its idle state. In a further method according to the invention, the control volume is filled with compressed air when the trigger element (and preferably the workpiece contact element) is in its idle state.

As a result, the control volume can be filled when the trigger element (and preferably the unactuated workpiece contact element) is released, so that in the ready-to-trigger state there is a high air pressure in the control volume.

In a further embodiment of the present invention, the activation element is additionally exchangeable between the first and the second position by means of the workpiece contact element. In a further method according to the invention, the activation element is additionally exchanged between these positions by means of the workpiece contact element.

As a result, the security is further increased because the securing device can also be activated when only the workpiece contact element is actuated.

Preferably, the activation element can be brought into the one position (preferably activation position) by the trigger element or the workpiece contact element, i. it is sufficient to actuate one of these elements, it can also be operated both elements. By contrast, both elements must be unconfirmed, so that the activation element can take the other position again.

Tool according to one of the preceding claims, wherein the activation element is pneumatically resettable in that of its first and second positions, in which the activation element is in the resting state of the trigger element. In a further method according to the invention, the activation element is pneumatically moved in the direction of the corresponding position.

This makes it possible to dispense with a return spring for the activation element. For this purpose, the activation element preferably has a surface difference of areas that are acted upon by gas of the gas pressure source minus areas that are connected to the pressure sink, wherein the area difference is positive.

In a further embodiment of the present invention, the securing device has a standby element pneumatically displaceable in a securing position and a standby position, wherein the tool is in the secured state when the standby element is in the securing position, and wherein the tool is in the ready-to-release state is when the standby element is in the standby position. In a further method according to the invention, the securing device transfers the driving tool from the ready-to-release state into the secured state by means of a pneumatic displacement of a stand-by element from a standby position into a securing position.

As a result, an embodiment of the securing device is provided, which enables the backup / readiness of the tool by means of pneumatic and the standby element.

In a further exemplary embodiment of the present invention, the standby element, in particular pneumatically or fluidically, is arranged between the control volume and the gas pressure source connection and the charge connection is led through an opening of the standby element. In another method of the invention, gas is passed from the gas pressure source port through an opening of the standby element and on to the control volume.

As a result, the control volume via the standby element with air can be filled - in contrast to the aforementioned driving tool, in which a filling of the control volume is done solely on the working piston, it is thus possible to fill the control volume without a Eintreibzyklus. In addition, a construction is thereby obtained, by means of which a pneumatic backup can be achieved because the standby element is part of the charging connection.

• einen ersten Oberflächenbereich mit einem ersten Flächeninhalt auf, der durch Gasdruck des Steuervolumens beaufschlagbar ist, wenn sich das Triggerelement in seinem gedrückten Zustand befindet, sowie
• einen zweiten Oberflächenbereich mit einem zweiten Flächeninhalt auf, der durch Gasdruck der Gasdruckquelle beaufschlagbar ist, wenn sich das Triggerelement in seinem gedrückten Zustand befindet und bevorzugt und wenn sich das Triggerelement in seinem Ruhezustand befindet;
  wobei der erste und der zweite Oberflächenbereich eingerichtet sind bei Beaufschlagung von Druck entgegensetzte Verschiebungskräfte auf das Bereitschaftselement 27 zu leiten (wozu sie bevorzugt sich entgegengesetzte Komponenten von Oberflächennormalen aufweisen) und wobei der erste und zweite Oberflächenbereich sich in einem gemeinsamen pneumatischen Volumen befinden, wenn sich das Aktivierungselement in der ersten Position befindet, und sich in zwei getrennten Volumen befinden, wenn sich das Aktivierungselement in der zweiten Position befindet. In einem weiteren erfindungsgemäßen Verfahren wird das Bereitschaftselement über zwei entgegensetzte Flächenbereiche pneumatisch verschoben und die Volumen, in denen sich die Flächenbereiche jeweils befinden, werden pneumatisch miteinander (direkt, d.h. ohne wesentlichen Strömungswiderstand dazwischen) verbunden, wenn das Aktivierungselement in die erste Position gewechselt wird, und sie werden pneumatisch voneinander getrennt, wenn das Aktivierungselement in die zweite Position gewechselt wird.

In another embodiment of the present invention, the standby element,

• a first surface area having a first surface area, which is acted upon by gas pressure of the control volume, when the trigger element is in its depressed state, as well as
• a second surface area having a second area area through Gas pressure of the gas pressure source can be acted upon when the trigger element is in its depressed state and preferred and when the trigger element is in its rest state;
  wherein the first and second surface regions are configured to direct displacement forces opposing pressure to the standby element 27 (preferably to which they have opposed components of surface normality), and wherein the first and second surface regions are located in a common pneumatic volume when the pressure is applied Activation element is in the first position, and are in two separate volumes when the activation element is in the second position. In another method according to the invention, the standby element is pneumatically displaced over two opposing surface areas and the volumes in which the surface areas are located are pneumatically connected to each other (directly, ie without significant flow resistance therebetween) when the activation element is changed to the first position, and they are pneumatically separated when the activation element is changed to the second position.

In this way, when the trigger element is in its depressed state, the position of the standby element is determined by two antagonistic surface areas and the pressure difference between the pressure in the control volume and the pressure in the gas pressure source. Since the gas pressure source is substantially constant, the position of the standby element is therefore substantially dependent on the change in the pressure in the control volume. By the possibility of connecting the volumes in which the two different surface areas are located by means of the activation element, a very rapid pressure equalization and thus a very rapid reset of the standby element are active by the user by means of the trigger element (which is coupled to the activation element). given.

In a further embodiment of the present invention, the first area is larger than the second area.

This makes it possible to dispense with the use of any springs that press the standby element in a rest position. The position and positioning of the standby element as well as the time constant realized by the standby element is thus constant for different gas pressures, which is not possible with a spring element with spring constant, which does not adapt to other gas pressures.

In a further embodiment of the present invention, the standby element is designed as a tubular piece, which is open at both end faces and has a central through-channel.

As a result, an extremely compact design is achieved. The pipe section preferably has different outer diameters. It is preferably mounted displaceably in a valve housing. The valve housing preferably also has analogously corresponding, different inner diameters. The different diameters enable a simple realization of antagonistic surface areas with different area contents.

In a further exemplary embodiment of the present invention, the pipe section has, in addition to the through-channel, an axial secondary channel, which has a preferably radially inner opening facing the through-channel and one of the axially spaced-apart, preferably radially outer, opening facing the outer environment of the pipe section. In a further method according to the invention, a gas flow is conducted from the gas pressure source connection through a corresponding axial auxiliary channel of the pipe section in order to load the control volume.

As a result, a compact design and advantageous guidance of the charging connection is made possible. The two openings preferably each form the end of the axial secondary channel.

In a further embodiment of the present invention, the activation element are arranged together with the standby element as a triggering valve or part of the triggering valve of the triggering arrangement in a trigger valve housing, which is insertable into a tool housing.

As a result, the essential movable parts of the safety device (activation element, standby element) are summarized as a compact assembly, which is thus easy to install, save space and / or retrofitted.

In a further embodiment of the present invention, the activation element is movably guided on the standby element as well as relative to the standby element. In a further method according to the invention, the activation element is guided accordingly.

As a result, a compact design is obtained because the activation element and standby element interact directly with each other and no additional guide parts must be provided. Preferably, the activation element is received by the standby element. Preferably, a contour of the activating element or a sealing element (e.g., sealing rings) of the activating element abuts a contour of the standby element or a sealing element (e.g., sealing ring) of the standby element (directly).

In a further embodiment of the present invention, the activation element and the standby element are inserted into one another and preferably concentric.

As a result, the design is very compact. More preferably, the activating element is concentrically received in the standby element formed as a pipe section, wherein an outer contour of the activating element or outer sealing elements (e.g., sealing rings) of the activating element abut (directly) the inner contour of the standby element or inner sealing elements (e.g., sealing rings) of the standby element.

In a further embodiment of the present invention, the activation element is arranged in the second position to interrupt the charging connection. In a further method according to the invention, the charging connection is interrupted by the activation element in the second position.

As a result, the control volume is separated from the gas pressure source as a function of the trigger position by means of the activation element, so that the gas pressure in the control volume can change from that of the gas pressure source.

In a further exemplary embodiment of the present invention, the tool has a main triggering valve and the tool has a triggering element which is set up to interrupt a pneumatic connection, referred to below as a triggering connection, from the gas pressure source connection to the main triggering valve, when the standby element is in the standby position, and wherein by means of the standby element, a pneumatic bypass is provided, bypassing the trigger element between the main trigger valve and the gas pressure source port, when the standby element is in the safety position. In a further method according to the invention, a triggering connection is interrupted accordingly by means of a triggering element of a main triggering valve and a pneumatic secondary line is accordingly provided.

This pneumatically prevents a triggering takes place when the standby element is in the safety position. On the other hand, a release by means of the trigger element is possible when the standby element is in the standby position. Preferably, there is also such a secondary line when the standby element is in the ready position and the activation element is not in the activation position. Preferably, the triggering element is arranged to define a pneumatic triggering discharge connection between the main triggering valve and a pressure sink (and not just to interrupt the triggering connection) when the standby element is in the ready position. As a result, the trigger element assumes a dual function, whereby a compact design is possible.

Preferably, the trigger element has a coupling element, which can be acted upon by the workpiece contact element, preferably in any position of the trigger element, and which mechanically couples the workpiece contact element with the trigger element.

The triggering element is preferably a pin. The triggering element preferably has sealing surfaces (eg sealing rings). The triggering element preferably has a rest position and a triggering position. Preferably, the trigger connection is interrupted only when the activation element is in one of its two position (eg the second position or the activation position) AND the trigger element is in the release position. As a result, the activation element has a triggering function when it is brought into the appropriate position, if the triggering element is already in the release position. The triggering element is preferably part of the triggering valve.

In another embodiment of the present invention, the activation element defines a portion of the trip connection from the gas pressure source port to the main trigger valve.

This allows a very compact design.

In another embodiment / method of the present invention, the triggering element is / are movably guided on the activating element and relative to the activating element.

As a result, a compact design is obtained because trigger element and activation element interact directly with each other and no additional guide parts must be provided. Preferably, a contour of the activating element or a sealing element (e.g., sealing rings) of the activating element abuts a contour of the triggering element or a sealing element (e.g., sealing ring) of the triggering element (directly).

In a further embodiment of the present invention, the activation element and the trigger element are inserted into one another and preferably concentric.

As a result, the design is very compact. Preferably, an outer contour of the trigger element or outer seal elements (e.g., seal rings) of the trigger element abut the inner contour of the activating element or inner sealing elements (e.g., sealing rings) of the activating element (directly).

• Fig. 1a, 1b eine Prinzipdarstellung eines erfindungsgemäßen Werkzeugs,
• Fig. 2 - Fig. 8 Schnittdarstellungen einer noch weiter bevorzugten Ausführungsform eines Werkzeugs basierend auf Fig. 1a, 1b in verschiedenen Zuständen,
• Fig. 9 ein Ablaufdiagramm der Verwendung einer weiter bevorzugten Ausführungsform eines Werkzeugs basierend auf den vorigen Figuren in verschiedenen Zustanden, die sich teils in den vorigen Figuren abgebildet wiederfinden,
• Fig. 10 - Fig. 12 aufbauend auf den vorigen Figuren eine Variante, in welcher das Aktivierungselement auch mittels den Werkstückkontaktelements verschiebbar ist, Fig. 13 ein Ablaufdiagramm für diese Variante.

The invention will now be further illustrated by way of example with reference to the drawings. Hereby show:

• Fig. 1a, 1b a schematic diagram of a tool according to the invention,
• Fig. 2-8 Sectional views of a still further preferred embodiment of a tool based on Fig. 1a, 1b in different states,
• Fig. 9 3 is a flow chart of the use of a further preferred embodiment of a tool based on the previous figures in various states, which are partly depicted in the previous figures,
• Fig. 10 - Fig. 12 Based on the previous figures, a variant in which the Activation element is also displaceable by means of the workpiece contact element, Fig. 13 a flow chart for this variant.

• eine Aktuatoreinheit 3, mittels der die Befestigungsmittel 90 in Eintreibzyklen in das Werkstück 91 eintreibbar sind,
• eine Auslöseanordnung 5, mittels der die Eintreibzyklen der Aktuatoreinheit 3 auslösbar sind, wobei die Auslöseanordnung 5 ein Triggerelement 6 aufweist, das handbetätigbar ist und einen Ruhezustand 600 (Fig. 1a) sowie einen gedrückten Zustand 601 (Fig. 1 b) aufweist, wobei die Auslöseanordnung 5 weiterhin ein Werkstückkontaktelement 7 aufweist, das durch das Aufsetzen des Eintreibwerkzeugs 1 auf das Werkstück 91 betätigbar ist,
• einen Gasdruckquellenanschluss 23, an den eine Gasdruckquelle anschließbar ist,
• eine Sicherungseinrichtung 8, welche mit dem Triggerelement 6 gekoppelt ist und eingerichtet ist, nach Ablauf einer von einer Aktivierung der Sicherungseinrichtung 8 ausgehenden Verzögerungszeit eine Überführung des Eintreibwerkzeugs 1 von einem auslösebereiten Zustand in einen gesicherten Zustand zu bewirken,
  • ▪ wobei die Sicherungseinrichtung 8 ein Steuervolumen 15 aufweist,
  • ▪ wobei die Sicherungseinrichtung 8 ein Aktivierungselement 33 aufweist, welches mittels des Triggerelements 6 zwischen einer ersten und einer zweiten Position wechselbar ist. In der ersten Position des Aktivierungselements 33 ist eine pneumatische Verbindung zwischen dem Steuervolumen 15 und dem Gasdruckquellenanschluss 23 definiert, die im Folgenden Ladeverbindung 27.1 genannt wird. In der zweiten Position des Aktivierungselements 33 ist eine pneumatische Verbindung zwischen dem Steuervolumen 15 und einer Drucksenke 40 definiert, die im Folgenden Entladeverbindung 33.1 genannt wird. Eine aus der Ladeverbindung 27.1 und der Entladeverbindung 33.1, hier die Entladeverbindung 33.1, weist einen kleinsten Strömungsquerschnitt auf, welcher zusammen mit einem Gasdruck der Gasdruckquelle die Verzögerungszeit der Sicherungseinrichtung 8 bestimmt.

Fig. 1a, 1b show a schematic diagram of a tool according to the invention 1 for driving fasteners 90 into a workpiece 91. The tool 1 has:

• an actuator unit 3 by means of which the fastening means 90 can be driven into the workpiece 91 in drive-in cycles,
• a trigger arrangement 5, by means of which the drive-in cycles of the actuator unit 3 can be triggered, the trigger arrangement 5 having a trigger element 6 which is manually actuatable and a rest state 600 (FIG. Fig. 1a ) and a depressed state 601 ( Fig. 1 b) wherein the trigger assembly 5 further comprises a workpiece contact element 7, which can be actuated by placing the driving tool 1 on the workpiece 91,
• a gas pressure source connection 23, to which a gas pressure source can be connected,
• a safety device 8, which is coupled to the trigger element 6 and is set up to effect a transfer of the driving tool 1 from a ready-to-release state into a secured state after the expiry of a delay time proceeding from an activation of the safety device 8,
  • ▪ wherein the securing device 8 has a control volume 15,
  • Wherein the securing device 8 has an activation element 33, which is exchangeable by means of the trigger element 6 between a first and a second position. In the first position of the activation element 33, a pneumatic connection between the control volume 15 and the gas pressure source connection 23 is defined, which will be referred to below as charge connection 27.1. In the second position of the activation element 33, a pneumatic connection between the control volume 15 and a pressure sink 40 is defined, which is referred to below as the discharge connection 33.1. One of the charging connection 27.1 and the discharge connection 33.1, here the discharge connection 33.1, has a smallest flow cross-section which, together with a gas pressure of the gas pressure source, determines the delay time of the securing device 8.

The safety device 8 of the tool 1 functions as follows. In Fig. 1a the control volume 15 is charged via the charging connection 27.1. The user presses from Fig. 1 a the trigger 6, the activation element 33 is moved, so that the charging connection 27.1 is disconnected and the discharge connection 33.1 is produced ( Fig. 1 b) , Due to the small cross section of the discharge connection 33.1, a discharge of the control volume 15 takes place slowly, ie with the determined delay time. Depending on the pressure in the control volume 15, the tool 1 is then placed in a ready-to-release state or a secured state.

These figures also illustrate the preferred embodiment, according to which the corresponding others from the charging connection 27.1 and the discharging connection 33.1, i. Here, the charging connection 27.1, a larger smallest flow cross-section than the one of the charging connection 27.1 and the discharge connection 33.1, i. the discharge connection 33.1, whereby the control volume 15 can be charged very quickly.

Furthermore, the preferred embodiment is illustrated, according to which the tool 1 has a pneumatic line, which is both part of the charging connection 27.1 and part of the discharge connection 33.1 and which extends from the activation element 33 to the control volume 15. In this case, the tool 1 further has two separate lines, one of the separate lines being part of the charging connection 27.1 and extending from the activation element 33 to the gas pressure source connection 23 and the other of the separate lines being part of the discharge connection 33.1 and extending from the activation element 33 extends to the pressure sink 40. The smallest flow cross section, which determines the delay time of the securing device 8 together with the gas pressure, is present in exactly one of the separate lines, here in the line which extends from the activating element 33 to the pressure sink 40. The fast loading and slow unloading of the control volume 15 is thereby realized constructively very advantageous.

Further preferred embodiments are given here, namely that the securing device 8 is set up to transfer the tool 1 into the secured state when the pressure falls below a threshold in the control volume and that the charging connection 27.1 is present when the trigger element 6 is in its idle state 600.

Fig. 2-8 show sectional views of a still further preferred embodiment of a tool 1 based on Fig. 1a, 1b in different states. It rejects the in Fig. 1 a and 1 b shown and described features.

• das Triggerelement 6 ist ein Triggerhebel, welcher an einer Triggerelementachse 6a schwenkbar gelagert ist;
• die Aktuatoreinheit 3 weist einen Arbeitszylinder 10 auf, in welchem ein Arbeitskolben 11 geführt, welcher einen Eintreibstempel 9 bewegt;
• auf der Seite des Arbeitskolbens 11 jenseits des Eintreibstempels 9 ist ein Treibvolumen 13 vorhanden.

Furthermore, the following preferred features are given here, which are also usually present in a compressed air injection tool, but are not absolutely necessary and work well together in an alternative form with the inventive features:

• the trigger element 6 is a trigger lever, which is pivotally mounted on a trigger element axis 6a;
• the actuator unit 3 has a working cylinder 10, in which a working piston 11 is guided, which moves a Eintreibstempel 9;
• on the side of the working piston 11 beyond the Eintreibstempels 9 a drive volume 13 is present.

FIGS. 2 and 3 show the tool 1 when no compressed air is connected, the standby element 27 is in the securing position. Fig. 4 shows the tool 1 with connected compressed air, wherein neither trigger element 6 nor workpiece contact element 7 are actuated - the standby element 27 is in the standby position. Fig. 5 shows the tool 1 with trigger element 6 pressed and with the standby element 27 still in the ready position, Fig. 6 the tool 1, after the predetermined time has expired and the tool 1 has been transferred to the secured state, the standby element 27 is now in the securing position. Fig. 7 shows the tool 1 in the state of triggering a driving operation, the standby element 27 is in the standby position, Fig. 8 the tool while pressed trigger element 6 and workpiece contact element 7, wherein it is in the secured state - the standby element 27 is in the safety position - and therefore no driving operation is triggered.

The activation element 33 can be pneumatically reset to that from its first and second position, in which the activation element 33 is in the idle state 600 of the trigger element 6. The activation element 33 has a positive surface difference of areas, which are acted upon by gas of the gas pressure source minus surfaces which are connected to the pressure sink 40.

The securing device 8 has a standby element 27 which can be displaced pneumatically into a securing position and a ready position. The tool 1 is in the secured state ( Fig. 2, 3rd . 6 . 8th ) when the standby element 27 is in the safing position and is in the ready to trip state 100 (FIG. Fig. 4, 5 . 7 ) when the standby element 27 is in the standby position. The standby element 27 is arranged between the control volume 15 and the gas pressure source connection 23, and the charge connection 27.1 is passed through at least two openings of the standby element 27 ( Fig. 4 ). The standby element 27 has a first surface area with a first surface area A1, which can be acted upon by gas pressure of the control volume 15 when the trigger element 6 is in its depressed state 601. It has a second surface area with a second area A2, which can be acted on by gas pressure of the gas pressure source when the trigger element 6 is in its depressed state 601 and when the trigger element 6 is in its idle state 600. The first and second surface areas are adapted to direct displacement forces applied to the standby element 27 upon application of pressure. For this they have opposite components of surface normals. The first and second surface areas are in a common pneumatic volume when the activation element 33 is in the first position (left or closer to the trigger element) and in two separate volumes when the activation element 33 is in the second Position (on the right or away from the trigger element). The first area A1 is greater than the second area A2. The standby element 27 is designed as a tube piece, which is open at both end faces and has a central passage 27.3. The pipe section has, in addition to the passage 27.3, an axial secondary passage 27.4 which has an opening facing the passage 27.3 and an opening axially spaced therefrom and facing the outside environment of the pipe section. The secondary channel 27.4 is part of the charging connection 27.1 (FIG. Fig. 4 ). The activation element 33 is movably guided on the standby element 27 as well as relative to the standby element 27. The activation element 33 and the standby element 27 are inserted into each other and concentric. Outer seal rings 33.2, 33.3, 33.4, 33.5, 33.6, 33.7 of the activation element 33 abut the inner contour of the standby element 27 directly. The activation element 33 is also formed as a pipe piece. The discharge connection 33.1 extends through two openings of the activation element 33 present in a lateral surface of the activation element 33.1 (FIG. Fig. 5 ). By the activation element 33, the discharge connection 33.1 is defined in the activation position (second position, right).

The tool 1 has a main triggering valve 12 and a triggering element 21, which is set up to provide a pneumatic triggering connection 21.1 (FIG. Fig. 5 ) from the gas pressure source port 23 to the main trigger valve 12 when the standby element 27 is in the standby position. By means of the standby element 27, a pneumatic secondary line 27.2 is provided, bypassing the triggering element 21 between the main triggering valve 12 and the gas pressure source connection 23, when the standby element 27 is in the securing position ( Fig. 6 ) or when the activation element 33 in the first position, left ( Fig. 4 ) is located. The activation element 33 defines part of the triggering connection 21.1 from the gas pressure source connection 23 to the main triggering valve 12 (FIG. Fig. 5 ). The triggering element 21 is movably guided on the activating element 33 and relative to the activating element 33. The activation element 33 and the trigger element 21 are inserted into one another. The triggering element 21 is here set up to define a pneumatic triggering discharge connection 21.2 between the main triggering valve 12 and the pressure sink 40.

The trigger element 6 has a coupling element 26 which can be acted upon by the workpiece contact element 7 in any position of the trigger element 21 and which mechanically couples the workpiece contact element 7 and the trigger element 6 to the trigger element 21.

• Um eine durchgehende Kontaktauslösung zu ermöglichen (Triggerelement 6 im gedrückten Zustand gehalten, Werkstückkontaktelement 7 wiederholt in kurzen Intervallen, kleiner als vorbestimmte Zeit, betätigt) weist der Arbeitszylinder 10 eine Belüftungsanordnung 18 aus mindestens einer, hier mehreren Öffnungen 18a in der Mantelfläche auf, welche radial (bzgl. Arbeitszylinder 10) außen mittels eines elastischen, als Einwegventil wirkenden Dichtungsrings 18b abgedeckt sind; die Belüftungsanordnung 18 ist in einem bezogen auf den Arbeitskolben 11 in Ruhestellung jenseits des Treibvolumens 13 liegenden Abschnitt 14 des Arbeitszylinders 10 angeordnet; auf diese Weise wird durch einen Eintreibvorgang über die Öffnungen 18a Druckluft in das Steuervolumen geleitet; Hiermit wird der Countdown der Sicherheitseinrichtung 8 zurückgesetzt, auch wenn das Triggerelement 6 durchgehend gedrückt gehalten wird;
• Elemente (insbesondere 27, 33, 21) der Sicherungseinrichtung 8 sind als Auslöseventil 20 der Auslöseanordnung 5 zusammengefasst, wobei das Auslöseventil 20 bevorzugt im Griffabschnitt 24 des Werkzeugs 1 angeordnet ist - insoweit kann das Auslöseventil 20 selbst auch als Teil der Sicherungseinrichtung 8 angesehen werden; das Auslöseventil weist ein Gehäuse 20.1 auf, in welchem das Bereitschaftselement 27 verschiebbar mit Dichtungselementen, hier Dichtungsringe, gelagert ist; ferner sind auch Aktivierungselement 33 und Auslöseelement 21 in dem Gehäuse 20.1 aufgenommen; eine pneumatische Leitung 12a führt vom Auslöseventil 20 zum Hauptauslöseventil 12 (hier ist nur der Anfang dieser Leitung am Auslöseventil 20 zu sehen, der restliche Teil der Leitung 12a ist verdeckt); im Gehäuse 20.1 ist ein gasquellenseitiger Ventileinlass 22 vorhanden sowie ein steuervolumenseitiger Ventileinlass 30; zwischen dem steuervolumenseitigen Ventileinlasse 30 und dem Steuervolumen 15 ist eine Be-/Entlüftungsleitung vorhanden, mittels welcher das Steuervolumen 15 über das Auslöseventil 20 be- oder entlüftbar ist;
• eine Auslöseelementfeder 21 a spannt das Auslöseelement 21 in seine Ruhelage (links) vor.

In addition, the following advantageous, optional concretizations are shown here:

• In order to enable a continuous contact release (trigger element 6 held in the depressed state, workpiece contact element 7 repeatedly at short intervals, less than predetermined time, actuated), the working cylinder 10, a ventilation assembly 18 from at least one, here several openings 18a in the lateral surface, which radially (With respect to working cylinder 10) are covered externally by means of an elastic, acting as a one-way valve seal ring 18b; the ventilation arrangement 18 is arranged in a relation to the working piston 11 in the rest position beyond the drive volume 13 lying portion 14 of the working cylinder 10; In this way, by a driving operation through the openings 18 a compressed air in directed the control volume; This resets the countdown of the safety device 8, even if the trigger element 6 is kept pressed continuously;
• Elements (in particular 27, 33, 21) of the securing device 8 are combined as a triggering valve 20 of the triggering arrangement 5, the triggering valve 20 preferably being arranged in the grip section 24 of the tool 1 - insofar as the triggering valve 20 itself can also be regarded as part of the securing device 8; the trigger valve has a housing 20.1, in which the standby element 27 is displaceably mounted with sealing elements, here sealing rings; Furthermore, activation element 33 and trigger element 21 are accommodated in the housing 20. 1; a pneumatic line 12a leads from the triggering valve 20 to the main triggering valve 12 (only the beginning of this line on the triggering valve 20 can be seen, the remaining part of the line 12a is hidden); in the housing 20.1 there is a gas-source-side valve inlet 22 and a control-volume-side valve inlet 30; between the control-volume-side valve inlet 30 and the control volume 15, there is a ventilation / venting line, by means of which the control volume 15 can be vented or vented via the release valve 20;
• a trigger element spring 21 a biases the trigger element 21 in its rest position (left).

Fig. 9 FIG. 12 is a flowchart illustrating the use of the further preferred embodiment of a tool based on the previous figures in various states, some of which are illustrated in the previous figures (cross references indicated by Roman numerals). States are each circled, events outlined in an angular manner.

In state I, the tool 1 is not connected to the gas pressure source. Therefore, the tool is in the locked state 101. The trigger element 6 is in the idle state 600, the workpiece contact element 7 in the unactuated state 700. The safety device 8 is not active, i. there is no time counter. The standby element 27 may be in either the backup position (left position) or the standby position (right position) in this state.

In state II, the tool 1 is then used by connecting 230 to the gas pressure source, whereby the device assumes the triggering state 100. In this case, the standby element 27 (if it has not already been there in state I) is moved into its standby position. This is due to the area difference causes the surface areas A1 and A2, which are both acted upon in this state by the pressure of the gas pressure source. About the charging connection 27.1, the control volume 15 is "charged" with gas pressure. Furthermore, there is a secondary line 27.2 in this state, which represents a bridging of the trigger element 21. The secondary line 27.2 is thus a non-interruptible from the trigger element 21 connection from the gas pressure source port 23 to the main trigger valve 12th

Starting from this state II, by pressing 710 of the workpiece contact element 7 (for example putting on and pressing the tool tip onto a workpiece), a next process state can be achieved (left, second line) in which the workpiece contact element 7 is then in its actuated state 701.

Starting from this state, it is possible to return to state II by actuating 610 the trigger element 6 in the state V or by lifting 720 of the workpiece contact element 7.

In state V, a drive-in cycle is triggered (indicated by the double border). Trigger element 6 is in the depressed state 601, workpiece contact element 7 in the actuated state 701. The trigger element 21 is in its release position, which is achieved by means of the coupling element 26. Characterized in that in this state V, both the trigger element 6 and the workpiece contact element 7 are in their respective actuated or depressed states, the trip connection 21.1 is made by the main trigger valve 12 to the pressure sink 40, so that the main trigger valve 12 is activated and the driving is performed. In this case, the driving volume 13 is acted upon by the gas pressure of the gas pressure source, so that the working piston moves in the direction of the tool tip (to the left). It passes through the ventilation arrangement 18, whereby the control volume 15 is also acted upon via the openings 18a with gas pressure of the gas pressure source. From this state V is reached by releasing 620 of the trigger element 6 in the previous state (left, second line) or by lifting 720 of the workpiece contact element 7 in the state III. The lift 720 simultaneously initiates activation 810 of the security device 8, thereby starting a countdown for moving the tool 1 to the secured state 101. Because with the lifting 720, the working piston 11 moves back to its rest position, so that the control volume 15 then can not be loaded via the ventilation assembly 18 - the elastic Since the trigger element 6 is pressed, 601, and thus the discharge connection 33.1 is made, the pressure in the control volume 15 gradually decreases, ie the countdown is running, the safety device 8 is activated.

In the state III can also be reached by pressing 610 of the trigger element 6 in state II, which also the safety device 8 is activated and thus starts a countdown for moving the tool 1 in the secure state 101. The control volume 15 has been charged by the charging connection 27.1 in state II and is then slowly discharged via the discharge connection 33.1.

In state III, the control volume 15 is separated from the gas pressure source (while, for example, in state II has a connection between these on the charging connection 27.1) and air escapes through the discharge connection 33.1, so that the standby element 27 abruptly after expiry of the predetermined time in the direction the securing position moves.

If now the trigger element 6 is released 620, one arrives back to state II. The control volume 15 is again connected to the gas pressure of the gas pressure source, charging connection 27.1, and the discharge connection 33.1 is disconnected. The standby element 27 is shifted back to the ready position and remains there.

On the other hand, when the workpiece contact element 7 is actuated 710, one returns to the state V and there is a drive-in cycle. The actuation 710 causes a displacement of the trigger element 20 in the release position (right position) by means of the coupling element 26, so that then the trigger connection 21.2 is restored.

On the other hand, if it remains in state III for longer than the predetermined time, i. Waiting for expiration 820 of the predetermined time, one arrives in state IV.

In state IV, the ready element 27 has arrived in the securing position (left position). The standby element 27 allows in this position, a secondary line 27.2, which connects the main trigger valve 12 with the gas pressure of the gas pressure source, so that no matter in which position is triggering element 21 or activation element 33, no interruption of this connection is possible. However, an interruption would be necessary to initiate a drive-in process. Therefore, no triggering is possible and thus the tool 1 is in the secured state 101. Also, an operation 710 of the workpiece contact element 7, which leads to the state VI and shifts the triggering element into its triggering position, can not cause a triggering, since the standby element 27 the secondary line 27.2 defines. In order to emerge from the saved state 101, the user must release the trigger element 6 620. Thus he returns from the state IV back to the state II or from the state VI back to the state shown in the second line on the left. By loosening 620 of the trigger 6, the control volume 15 is again connected to the gas pressure source and the standby element 27 is moved to the ready position, since the activation element 33 is pneumatically shifted with dissolved trigger 6 back to the left position and then the charging connection 27.1 restores.

Fig. 10-Fig. 12 show, based on the previous figures, a variant in which the activation element 33 is also displaceable by means of the workpiece contact element 7. The workpiece contact element 7 is mechanically coupled to the activation element 33 such that the workpiece contact element 7 can press the activation element 33 into the activation position (right position); this condition is in FIGS. 11 and 12 shown, wherein the standby element 27 in Fig. 11 is in the ready position and in Fig. 12 in the hedging position. This additional mechanical coupling to the activation element 33 is here by way of example and roughly indicated by means of an angled region of the workpiece contact element 7. Similarly, the workpiece contact element 7 is as previously set up to press the triggering element 21 via the coupling element 26. Only when both elements of trigger element 6 and workpiece contact element 7 are unactuated or in the idle state, the activation element 33 can move out of the activation position.

Fig. 13 shows a flowchart for this variant of Fig. 10-12 , where again states with Roman numbers are referenced - the states II-VI can the Fig. 2-8 are removed, with only the changed mechanical coupling between activation element 33 and workpiece contact element 7 makes a difference, the state otherwise, however, is the same. The process builds on the in Fig. 9 shown process; In contrast, the securing device 8 is now already activated by pressing 710 of the workpiece contact element 7, so that it is now in the state VII in the activated state 801, because by the workpiece contact element 7, the activation element 33 is moved to the left position, so that the discharge connection 33.1 is made. Therefore, already from state VII, the predetermined time can elapse 820 and the tool is transferred to the saved state 101, which leads overall to state VIII, which in contrast to Fig. 9 is new, since now also a secured state 101 can be achieved when the trigger element 6 is in the unpressed state 600. Furthermore, it is different that now no longer starting from the state VI by releasing 620 of the trigger element 6, the tool in a ready-triggering state 100 back, because it is generally true that a transfer to the ready state 100 is only possible if both the Trigger element 6 and the workpiece contact element 7 are brought into the unactuated or unpressed state. <B><u> REFERENCE LIST </ u></b> 1 driving tool 17 connection 3 actuator 18 ventilation arrangement 5 trigger assembly 18a openings 6 trigger element 18b elastic ring 6a Trigger element axis 19 Loading / vent line 7 Workpiece contact element 20 release valve 8th safety device 20.1 casing 9 Eintreibstempel 21 triggering element 10 working cylinder 21.1 tripping link 11 working piston 21.2 Auslöseentladeverbindung 12 Main release valve 21a Triggering element spring 12a Line to main trigger valve 22 gas source side valve inlet 13 propellant volume 23 Gas source terminal 14 the lying on the working piston beyond the drive volume portion of the working cylinder 24 handle portion 26 coupling element 27 willingness element 15 control volume 27.1 charging connection 27.2 secondary line 610 Pressing the trigger element from idle state to depressed state 27.3 central passageway 27.4 axial secondary channel 30 control-volume-side valve inlet 620 Pressing the trigger element from pressed state to idle state 33 energizer 33.1 Entladeverbindung 33.2, 33.3, 33.4, 33.5, 33.6, 33.7 Sealing rings of the activation element 700 unactuated state of the workpiece contact element 701 actuated state of the workpiece contact element 40 pressure sink 90 fastener 710 Actuating the workpiece contact element 91 workpiece 100 ready to trigger state of the tool 720 Lifting the workpiece contact element from the workpiece 101 secured condition of the tool 800 inactive safety device 801 active safety device 230 Connecting to power source 810 Activate the safety device 600 Hibernation of the trigger element 601 pressed state of the trigger element 820 Automatic expiry of the predetermined time A1 first area A2 second area

Claims (16)

A driving tool (1) for driving fasteners (90) into a workpiece (91), the tool (1) comprising: an actuator unit (3) by means of which the fastening means (90) can be driven into the workpiece (91) in drive-in cycles, a triggering arrangement (5) by means of which the drive-in cycles of the actuator unit (3) can be triggered, the triggering arrangement (5) having a trigger element (6) which can be manually actuated and has an idle state (600) and a depressed state (601), the trigger arrangement (5) further comprising a workpiece contact element (7) which can be actuated by placing the driving tool (1) on the workpiece (91), a gas pressure source connection (23) to which a gas pressure source can be connected, - A safety device (8), which is coupled to the trigger element (6) and is set, after expiration (820) of an activation (810) of the securing device (8) outgoing delay time, a transfer of the driving tool (1) from a ready to trigger state (100) to effect a secure state (101) Wherein the securing device (8) has a control volume (15), Wherein the securing device (8) has an activation element (33) which can be exchanged between a first position and a second position by means of the trigger element (6),
wherein in the first position of the activation element (33) a pneumatic connection between the control volume (15) and the gas pressure source connection (23) is defined, which is referred to below as a charge connection (27.1),
and wherein in the second position of the activation element (33) a pneumatic connection between the control volume (15) and a pressure sink (40) is defined, which is referred to below as discharge connection (33.1),
wherein one of the charging connection (27.1) and the discharge connection (33.1) has a smallest flow cross-section which, together with a gas pressure of the gas pressure source, determines the delay time of the securing device (8). Tool (1) according to claim 1, wherein the corresponding others from the charging connection (27.1) and the discharge connection (33.1) has a larger smallest flow cross-section than the one of the charging connection (27.1) and the discharge connection (33.1). Tool (1) according to claim 2, wherein the tool (1) comprises a pneumatic line which is both part of the charging connection (27.1) and part of the discharge connection (33.1) and which extends from the activation element (33) towards the control volume (15 ), and wherein the tool (1) further comprises two separate lines, wherein one of the separate lines is part of the charging connection (27.1) and extends from the activation element (33) to the gas pressure source connection (23) and the other of the Separate lines is part of the discharge connection (33.1) and extends from the activation element (33) to the pressure sink (40), wherein the smallest flow cross-section, which together with the gas pressure determines the delay time of the securing device (8) in exactly one of the other separate lines is present. Tool (1) according to one of the preceding claims, wherein the securing device (8) is adapted to transfer the tool (1) falls below a pressure threshold in the control volume in the secured state. Tool (1) according to claim 4, wherein the charging connection (27.1) is present when the trigger element (6) is in its rest state. Tool (1) according to one of the preceding claims, wherein the activation element (33) is additionally exchangeable between the first and the second position by means of the workpiece contact element (7). Tool (1) according to one of the preceding claims, wherein the activation element (33) is pneumatically resettable in that of its first and second positions, in which the activation element (33) in the idle state (600) of the trigger element (6). Tool (1) according to one of the preceding claims, wherein the securing device (8) has a standby element (27) which can be moved pneumatically to a securing position and a standby position, wherein the tool is in the secured state (101) when the standby element (27 ), and wherein the tool is in the ready to trip state (100) when the standby element (27) is in the standby position. Tool (1) according to claim 8, wherein the standby element (27) between the control volume (15) and the gas pressure source connection (23) is arranged and the charging connection (27.1) is passed through an opening of the standby element (27). Tool (1) according to one of claims 8 to 9, wherein the standby element (27), - Has a first surface area with a first surface area (A1), which is acted upon by gas pressure of the control volume (15) when the trigger element (6) is in its depressed state (601), and - Having a second surface area with a second surface area (A2), which is acted upon by gas pressure of the gas pressure source, when the trigger element (6) is in its depressed state (601);
wherein the first and second surface regions are configured to direct displacement forces opposing pressure to the standby element (27) and wherein the first and second surface regions are in a common pneumatic volume when the activation element (33) is in the first position , and are in two separate volumes when the activation element (33) is in the second position. Tool (1) according to one of claims 8 to 10, wherein the standby element (27) is designed as a pipe piece which is open at both end faces and has a central through-channel (27.3). Tool (1) according to one of claims 8 to 11, wherein the activation element (33) together with the standby element (27) as a trigger valve (20) or Part of the trigger valve (20) of the trigger assembly (5) in a trigger valve housing (20.1) are arranged, which is insertable into a tool housing. Tool (1) according to one of claims 8 to 12, wherein the activation element (33) on the standby element (27) and relative to the standby element (27) is movably guided. Tool (1) according to one of the preceding claims, wherein the tool has a main triggering valve (12) and wherein the tool (1) comprises a triggering element (21) which is arranged, a pneumatic connection, hereinafter called triggering connection (21.1) of the gas pressure source connection (23) to the main trigger valve (12) when the standby element (27) is in the standby position, and by means of the standby element (27) a pneumatic secondary line (27.2), bypassing the trigger element (21) between the main trigger valve (27) 12) and the gas pressure source port (23) when the standby element (27) is in the securing position. Tool (1) according to claim 15, wherein the trigger element (21) is movably guided on the activating element (33) and relative to the activating element (33). Method for driving fasteners (1) into a workpiece (91) - wherein the fastening means (1) are driven by means of an actuator unit (3) in drive-in cycles in the workpiece (91), wherein by means of a trigger arrangement (5) the drive-in cycles of the actuator unit (3) are triggered, wherein a trigger element (6) of the trigger arrangement is manually operated and thereby brought from a rest state (600) to a depressed state (601), wherein a workpiece contact element ( 7) is actuated (710) by placing the driving tool on the workpiece (91), wherein a gas pressure source connection (23) is connected to a gas pressure source, - Wherein one with the trigger element (6) coupled to the safety device (8) after one of an activation (810) of the securing device (8) outgoing delay time a transfer of the driving tool from a trigger ready state (100) into a secured state (101) causes
in that an activation element (33) is changed between a first position and a second position by means of the trigger element (6),
wherein in the first position of the activation element (33) a first pneumatic connection between the control volume (15) and the gas pressure source connection (23) is defined, which is called charging connection (27.1) below, and wherein in the second position of the activation element (33) a second pneumatic connection is defined between a control volume (15) of the safety device (8) and a pressure sink (40), which is referred to below as a discharge connection (33.1),
wherein by a from the charging connection (27.1) and the discharge connection (33.1) flows a maximum gas flow, which determines the delay time of the securing device (8).

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