EP3471921A1

EP3471921A1 - Pneumatic nailer having individual triggering and contact triggering

Info

Publication number: EP3471921A1
Application number: EP17727891.8A
Authority: EP
Inventors: Martin THEBERATH; Joachim Bauer
Original assignee: Joh Friedrich Behrens AG
Current assignee: Joh Friedrich Behrens AG
Priority date: 2016-06-15
Filing date: 2017-06-06
Publication date: 2019-04-24
Anticipated expiration: 2037-06-06
Also published as: RU2699883C1; CN109803794B; WO2017215977A1; TW201803701A; AU2017286166B2; ES2760599T3; EP3471921B1; EP3257632A1; US20190176312A1; BR112018076088A2; JP7108369B2; CN109803794A; JP2019521865A; AU2017286166A1; TWI680846B; US11090790B2

Abstract

The invention relates to a pneumatic nailer, comprising a triggering device, which has a manually actuatable trigger, an application sensor, and a force-transmitting device, which activates a control valve that triggers a driving operation, and a switching device, which can put the force-transmitting device into a contact triggering position, in which the force-transmitting device activates the control valve as a result of actuation of the application sensor while the trigger is actuated, wherein the switching device has a first position associated with individual triggering operation and a second position associated with contact triggering operation, when a driving operation is triggered, the switching device is moved into the second position, the switching device has a control piston, which is designed to move the force-transmitting device into or keep the force-transmitting device in the contact triggering position, wherein the control piston is guided in a control cylinder, which has a control volume, wherein the control piston is moved into the first position when the pressure in the control volume is below or exceeds a specified pressure, and air is introduced into or removed from the control volume by the control valve when a driving operation is triggered.

Description

Pneumatic nailer with single and contact release

The invention relates to a pneumatic nailer with a working piston, which is connected to a driving ram for driving a fastener and is subjected to the initiation of a driving operation with compressed air, a triggering device having a manually actuable trigger, a Aufsetzfühler and a power transmission device in a single trip operation as a result Actuation of the trigger with actuated Aufsetzfühler controls a control valve that triggers a drive-in.

The Aufsetzfühler is a mechanical component, which is usually held by a spring in a protruding over a neck tool of Druckluftnaglers position. If the compressed air bearing is attached to a workpiece, the touch sensor is displaced against the force of the spring until the muzzle tool rests against the workpiece or almost rests. Only with such actuated Aufsetzfühler a driving operation can be triggered. As a result, the known compressed air nailers offer a significantly improved security against unintentional release compared to devices without Aufsetzfühler.

Some pneumatic nailers with a triggering device of the type described can be used in two different modes. In the so-called single release the pneumatic nailer is first attached to a workpiece and thereby actuated the landing sensor. Subsequently, the trigger is actuated by hand, thereby triggering a single drive.

In the so-called contact triggering, also referred to as "touching", the user already holds the trigger while attaching the pneumatic nailer to the workpiece, and when applying it to the workpiece, the landing feeler is actuated thereby initiating a drive in. The pneumatic nailer can repeatedly move faster Be followed, which makes very fast work possible, in particular especially if many fasteners must be driven for a sufficient attachment, at the positioning accuracy only small demands are made.

In certain situations, however, the contact triggering procedure entails an increased risk of injury. For example, not only does the user depress the hand-operated trigger when he wants to place the pneumatic nailer on one and the same workpiece a few centimeters from the last driven fastener, but also when changing to another remotely located workpiece in an accidental contact of an object or body part with the Aufsetzfühler a driving operation are triggered. For example, accidents can occur if a user (in violation of important safety regulations) uses the pneumatic nailer to climb onto a ladder, holding down the trigger and inadvertently brushing his leg with the jack sensor.

From the publication JP 2002 346946 A a pneumatic nailer with a trigger and a touch sensor has become known. When the touch sensor is first actuated and then the trigger is actuated, a contact trip operation is active and fasteners can be driven through successive actuations of the touch probe until the trigger is released. If the release button is pressed first and then the touch sensor, a single release operation is active and another drive can not be triggered until the release has been released. From document US 2005/0023318 AI a pneumatic nailer with the same functionality has become known. In both known pneumatic nailers can be prevented by using the single trigger operation that inadvertently a second fastening means is driven after a single driving operation. However, the risk of injury outlined above persists. From EP 2 767 365 AI a pneumatic nailer has become known, which has a triggering device with a trigger, a Aufsetzfühler and a power transmission device. In a single triggering operation, the power transmission device controls a control valve, which triggers a driving operation as a result of actuation of the trigger when actuated Aufsetzfühler. As an additional safety measure, the known pneumatic nailer has a safety control chamber, the pressure of which acts on a blocking piston, which prevents the triggering of a driving operation in a specific position of the blocking piston. It is only possible for a short time after actuation of the trigger a contact release, namely, until the pressure in the safety control chamber has passed a predetermined pressure threshold. Thereafter, the pneumatic nailer is locked until the trigger is released and the pressure in the safety control chamber has returned to its initial state.

From the document DE 10 2013 106 657 AI a pneumatic nailer has become known with the features of the preamble of claim 1.

On this basis, it is the object of the invention to provide a pneumatic nailer with an improved safety mechanism.

This object is achieved by the pneumatic nailer with the features of claim 1. Advantageous embodiments are specified in the subsequent subclaims.

The pneumatic nailer has

A working piston, which is connected to a driving ram for driving in a fastening means and is subjected to the triggering of a driving operation with compressed air, A triggering device comprising a manually actuable trigger, a touchdown sensor and a power transmission device, which controls a control valve that triggers a drive in a single trip operation as a result of actuation of the trigger with actuated Aufsetzfühler, and

• A switching device which can put the power transmission device for a contact tripping operation in a contact release position, in which the power transmission device, the control valve is actuated when the trigger is actuated as a result of actuation of the Aufsetzfühlers.

The pneumatic rodger is used to drive fasteners such as nails, pins or staples. For this purpose, the pneumatic nailer can have a magazine for the fastening means, from which in each case a fastening means is supplied to a receptacle of a necking tool of the pneumatic nailer. When initiating a driving operation, a working piston of the pneumatic nailer is pressurized with compressed air. In this case, the working piston drives a driving ram, which is connected to the working piston. The drive ram strikes a rear end of the fastener in the receptacle of the muzzle tool and drives the fastener into the workpiece.

The triggering device has a hand-operated trigger, for example in the form of a tilt or push button, and a touch sensor. The touch sensor may be a mechanical component that projects beyond the forward end of the mouth of the tool and is held in this position by a spring until the pneumatic nailer is applied to a workpiece. Then the attachment sensor is displaced counter to the direction of the spring force and counter to the driving direction.

The trigger and the Aufsetzfühler act on a power transmission device to a control valve, the triggering triggers a Eintreibvorgang. To Control of the control valve, in particular a control pin of the control valve can be displaced from the power transmission device. For this purpose, a joint actuation of trigger and Aufsetzfühler is required. If only one of the manually actuable release and the touch sensor is actuated, the first control valve will not be actuated. In the so-called single-trip operation, a drive-in process is also triggered only when the trigger is actuated when the touch sensor is actuated. So it must first the touch sensor and then the shutter button is pressed.

As long as the pneumatic nailer is in a ground state, for example after the pneumatic nailer has been put into operation (eg by connecting the compressed air nailer to a compressed air source) or after a break in work, it is fundamentally not possible to trigger a driving operation by first actuating the trigger and then, at actuated trigger, the touch sensor is actuated.

However, in order to enable such a contact release, the pneumatic nailer according to the invention has a switching device with which the power transmission device for a contact tripping operation can be set in a contact release position. Unlike in the ground state, the power transmission device can control the control valve in this contact release position, even when the trigger is actuated by subsequent actuation of the Aufsetzfühlers.

The pneumatic nailer therefore offers optimum operational safety, because it basically only allows a single triggering operation. Only with the help of the switching device, which acts on the power transmission device, can be changed to a contact trip operation.

The switching device has a first position assigned to the individual trip operation and a second position assigned to the contact trip operation, wherein when a Eintreibvorgangs triggering the switching device is moved to the second position. If the changeover device is in the first position, only the explained single release operation is possible. If it is in the second position, it can put the power transmission device into the contact release position and / or hold it in this contact release position. By relocating the switching device in the second position when triggering a Eintreibvorgangs is thus switched to the contact release operation as soon as a (first) driving operation was triggered. In particular, it is thus possible, after a first, carried out by means of single triggering driving-in drive further fasteners in the contact trip operation. This simplifies in particular the driving of several fasteners in rapid succession in the same workpiece, but does not lead to a significant impairment of occupational safety, since the successive contact tripping are only possible if previously a single release was performed.

In one embodiment, the switching device has a time control, so that the switching device (automatically) returns after a predetermined time from the second position to the first position, if no driving operation is triggered. The predetermined time may be, for example, in the range of 1 second to 10 seconds. The mentioned measure means that after a brief interruption of work, for example when changing to another workpiece, no contact tripping is possible. Instead, once the specified time has elapsed, a single trip must first be performed again.

There are basically numerous possibilities for the execution of the switching device and the timing, including mechanical, electromechanical or electronic solutions. In the invention, the switching means on a control piston, which between the first position and the second Position movable and is adapted to shift the power transmission device in the contact release position or to keep in the contact release position. The use of a control piston for the switching device allows in particular a pneumatic solution that can be particularly space-saving and reliable.

The control piston is guided in a control cylinder, which has a control volume, wherein the control piston is displaced upon undershooting or exceeding a predetermined pressure in the control volume in the first position. The return of the switching device in the first position is therefore based on the pressure in the control volume. In addition, the control piston can be acted upon by a spring force, in particular in one of the direction of the force exerted by the pressure opposite direction.

The control volume is vented or vented when a drive-in process is triggered. By "venting" is always meant that a connection is made to a compressed air-carrying space with "venting" is always meant that a connection to a non-pressurized space, in particular to the outside air, is produced. The venting or venting of the control volume is taken over by the control valve. Thus, each time the control valve is actuated, not only a drive-in operation is triggered, but at the same time compressed air is directed into the control volume by the control valve or compressed air can escape from the control volume via the control valve. The desired pressure change in the control volume is thereby effected very quickly and directly via the control valve. An advantage of this ventilation of the control volume via the control valve is that the essential control processes, including the control of the switching device are bundled in a small space and can be performed with relatively little compressed air consumption independently or decoupled from the driving operation. Depending on the configuration of the effective direction of the control piston, the control displaced piston either by aerating or by venting in the second position.

In one embodiment, the control volume is vented via a check valve. This venting of the control volume leads to a displacement of the control piston in the second position. By using a check valve, the pressure in the control volume after aeration is initially maintained, especially when the control valve is used for the aeration of the control volume and the control valve is moved back to a non-activated position after the driving operation.

In one embodiment, the timing controller has a throttle connected to the control volume. Depending on the direction of action, the control volume can be connected via the throttle with the housing interior under pressure or with outside air or connected by driving a valve with it. For example, in an embodiment in which the control volume is vented to displace the spool to the second position, the control volume via the throttle may be connected to outside air. Then the air in the control volume escapes after each ventilation of the control volume, i. after each drive, via the throttle to the outside. If a predetermined pressure threshold is reached, the control piston returns to its first position, in particular by the force of a spring.

In one embodiment, the power transmission device has a movably mounted force transmission element with a button for actuating the control valve, wherein the force transmission element is arranged in the contact release position of the power transmission, that it is carried along by a driver of the power transmission device connected to the Aufsetz- and movement in performs a triggering direction. This way will a simple way to contact triggering created from the contact release position.

In one embodiment, the switching device is adapted to limit in the second position, a movement of the power transmission element against the triggering direction. In this way, the switching device can in particular prevent the force transmission element from the contact release position against the release direction in a basic position in which a contact release is not possible, comes back. The power transmission element or the power transmission device can be held in particular in the contact release position.

In one embodiment, the power transmission element is a rocker pivotally mounted about a pivot axis in the trigger with a button and the movement is a pivotal movement about the pivot axis. In principle, the force transmission element can perform both a translatory and a rotational movement or a combination of both. The use of a rocker with a pivot axis is a particular robust and simple solution. The button of the rocker is that portion which is designed to control the control valve.

In one embodiment, the control piston has a piston rod which, in the second position of the control piston, can rest on a control surface of the rocker which is opposite to a pivot axis of the rocker of the button of the rocker. As a result, the piston rod limit movement of the rocker against the release direction.

In one embodiment, the control piston on a piston rod which is passed through an opening of the rocker, so that the piston rod, the rocker in Towards the direction of the control piston out. The opening is located in particular on the same side of the pivot axis as the button of the rocker. By pulling the rocker with the piston rod, a movement of the rocker against the release direction can also be limited.

In one embodiment, the control valve and the control piston are combined in a valve block. Optionally, the throttle can be integrated into the valve block. In this way, a particularly compact arrangement. The valve block is arranged in particular above the trigger.

In one embodiment, a pneumatic connection between the control valve and the control volume, via which the control volume is vented or vented by the control valve, a total volume which is smaller than the control volume. In particular, the pneumatic connection may consist of a single conduit which leads from the control valve to the control volume, for example from a relatively small diameter bore and / or relatively small length. This design contributes to a high efficiency of the pneumatic nailer, because the compressed air consumption for the required pressure change in the control volume is low. In addition, the space available in the compressed air nailer as an accumulator space is only slightly reduced by the small total volume of the pneumatic connection.

In one embodiment, the pneumatic connection is arranged within the valve block. This allows a particularly compact design of the pneumatic nailer.

In one embodiment, the size of the control volume is at most 5% of the size of a working volume of a working cylinder in which the working piston is guided. The invention will be explained in more detail with reference to two embodiments shown in FIGS. Show it:

1 shows a first embodiment of a pneumatic nailer according to the invention in a partially sectioned illustration,

Fig. 2 is an enlarged view of a detail with main valve and

Pilot valve of Figure 1,

FIGS. FIGS. 3 to 8 are enlarged representations of selected elements of FIG. 1 in different operating states;

FIGS. 9 to 14 selected elements of a pneumatic nailer after a second

Embodiment in different operating conditions.

First, with reference to FIG. 1, some elements of the pneumatic nailer 10 are shown partly as an overview. The pneumatic nailer 10 has a lower housing part 140 with a handle 12. The lower housing part 140 is closed at the top by a housing cap 142.

The manually operable trigger 14 is pivotally mounted about a pivot axis 16 on the housing of the pneumatic nailer 10 and arranged so that it can be easily operated by a user who holds the pneumatic nailer 10 on the handle 12 with the index finger. In addition, there is a touch sensor 24, which projects over the mouth 26 of a neck tool 28 by a few millimeters down. If the pneumatic nailer 10 is attached to a workpiece, the Aufsetzfühler 24 is displaced upward against the force of a spring, not shown, until it is flush or almost flush with the mouth 26.

The triggering device of the pneumatic nailer 10 comprises, in addition to the trigger 14 and the landing sensor 24, a power transmission device comprising a slide 30 and a power transmission element in the form of a rocker 18 has. The slider 30 is a continuation of the touch sensor 24 or is connected to the touch sensor 24. It always moves in unison with the landing sensor 24, and in particular, follows its upward movement relative to the housing when the air nailer 10 is attached to a workpiece. The rocker 18 has a button 20 with which a control valve 22 arranged above the trigger 14 can be actuated.

The mouth tool 28 has a receptacle 46, to which a fastening means is supplied from a magazine 48 in each case. From this position within the receptacle 46, the fastener - for example, a nail, a pin or a clip - by a driving ram 50, which is connected to a working piston 52 of the pneumatic nailer 10, driven. For this purpose, the working piston 52 is guided in a working cylinder 54. Above the working cylinder 54 and this sealingly closing a main valve 56 is arranged, to the right thereof a pilot valve 58 which controls the main valve 56. Details of these elements and the associated function of the device will be explained in more detail with reference to the enlarged detail of Figure 2.

In FIG. 2, individual elements of the pneumatic nailer 10, which are arranged above the housing cap 142 in FIG. 1, have been omitted. The pilot valve 58 is clearly visible. It has a control piston 94, which is guided in a guide sleeve 96. The lower end of the control piston 94 is sealed with a lower O-ring 100 opposite the guide sleeve 96. In the initial state of the pneumatic nailer 10 is a first control line 82 which is connected to a working volume of the pilot valve 58, vented and the control piston 94 is in the lower position shown. In this position, it is held by the force of a spring 102. The control piston 94 has a middle O-ring 104 and an upper O-ring 106 in addition to the lower O-ring 100. In the illustrated lower position of the control piston 94, the upper O-ring 106 seals the control piston 94 against the guide sleeve 96 and closes a connection to a vent not shown, which is connected to outside air. The middle O-ring 104 is not in seal, so that a main control line 110 is connected via a radial bore 112 in the guide sleeve 96 and the annular gap 70 between the control piston 94 and guide sleeve 96 on the middle O-ring 104 past the housing interior 64. The main control line 110 is connected via a not visible in the sectional plane shown connection with the space 72, which opens into the radial bore 112. The housing interior 64 is vented in the initial state of the compressed air nailer 10, that is connected to a compressed air connection, not shown, and standing under operating pressure.

The main control line 110 is connected to a space 114 above a main valve actuator 116 of the main valve 56, so that the main valve actuator 116 is acted upon by a downward force and thereby the upper edge of the working cylinder 54 by means of an O-ring 118 relative to the housing interior 64th seals. In addition, the main valve actuator 116 is acted upon by a spring 120 with a force in the direction of the shown, the working cylinder 54 occluding position.

A drive-in operation is initiated by venting the first control line 82 by displacing the control piston 94 upwardly so that the middle O-ring 104 enters the seal and the upper O-ring 106 moves out of the seal. Characterized the connection of the main control line 110 is shut off to the housing interior 64 and made a connection between the main control line 110 and a vent not shown. The space 114 above the main valve actuator 116 is vented through the vent and the main valve actuator 116 is displaced upward by the prevailing at its lower, outer annular surface 122, prevailing in the housing interior pressure 64 against the force of the spring 120. As a result, compressed air flows from the housing interior 64 into the working cylinder 54 above the working piston 52 and drives the working piston 52 downwards. During this downward movement, the driving ram 50 connected to the working piston 52 drives a fastening means.

Details of the triggering device can be seen better in FIG. 3, which shows a basic state of the pneumatic nailer 10. Trigger 14 and Aufsetzfühler 24 are not actuated.

The slider 30 is movably guided on the housing of the pneumatic nailer 10 and has for this purpose a slot 32 through which a guide pin 98 is passed.

The manually actuable trigger 14, the rocker 18 pivotally mounted therein about a pivot axis 38 and the button 20 of the rocker 18 are also clearly visible. The pivot axis 38 is located in a central portion of the rocker 18. A front end 34 of the rocker 18 is located in the position shown at one of an upper end of the slider 30 formed driver 36 at. The button 20 is located between the front end 34 of the rocker 18 and the pivot axis 38 and the middle portion of the rocker 18. Upon actuation of the setting sensor 24 from the position shown upwards of the driver 36 takes the front end of the rocker 34th with, so that the rocker 18 performs a pivoting movement in a release direction.

Under certain conditions, which will be explained in detail in connection with the other figures, controls the button 20 of the rocker 18, the control valve 22 by displacing a control pin 42 upwards, whereby a driving operation is triggered. The control pin 42 of the control valve 22 is in an in the housing inserted and sealed against this sleeve 66 of the control valve 22 out. A spring 92 is disposed around the control pin 42 and urges the trigger 14 and the rocker 18 with a downward force, against the triggering direction.

In the illustrated position of the control valve 22, however, an upper O-ring 40 of the first control valve 22 seals the housing interior 64 from a radial bore 44 of the control valve 22, while the lower O-ring 60 of the control valve 22 is not in seal, so that the radial bore 44 is connected to outside air. The radial bore 44 is connected via an annular gap 62 with the first control line 82, so that the first control line 82 is vented in the drawn position of the control valve 22.

In the figure 3 right next to the control valve 22, a switching device 80 is shown, which has a guided in a control cylinder 68 control piston 132 with a piston rod 134. Above the control piston 132 there is a control volume 74. The pressure in the control volume 74 acts on the control piston 132 acted upon in the opposite direction by the force of a spring 76. The control volume 74 is connected via a throttle 78 with outside air in connection. On the relative to the pivot axis 38 of the front end 34 of the rocker 18 opposite side of the rocker 18 has a control surface 124 which can cooperate with the piston rod 134.

The control valve 22, the control piston 132 and the throttle 78 are combined to form a valve block. The valve block is arranged above the trigger 14 in the housing of the pneumatic nailer 10.

Another connection between the control volume 74 and the annular gap 62 of the control valve 22, via a formed by an O-ring 84 Check valve and an obliquely arranged bore 86. The O-ring 84 is seated in an outer circumferential groove 88 of the sleeve 66 and seals a radially disposed bore 90 in the sleeve 66 from. The function of this connection will be explained in connection with the other figures.

In the position of Figure 3, the switching device 80 and the control piston 132 is in a first position, which is associated with a single trip operation. The piston rod 134 is in this position not or only slightly before from the housing.

Figure 4 shows the arrangement of Figure 3 after the landing sensor 24 has been operated. It can be seen that the driver 36 has taken along the front end 34 of the rocker 18 during the upward movement of the slider 30. To a control of the control valve 22, this does not yet, because the trigger 14 has not been pressed.

FIG. 5 shows the arrangement from FIG. 4, after the trigger 14 has been actuated while the touch sensor 24 is still actuated. As a result of this step, the pivot axis 38 moves upward relative to the position shown in FIG. 4, and the button 20 of the rocker 18 actuates the control valve 22 by displacing the control pin 42 upwards. As a result, the upper O-ring 40 moves out of the seal and the lower O-ring 60 seals against the sleeve 66 from. As a result, the first control line 82 is vented via the connection already described, which triggers a drive-in operation, as explained in connection with FIG. 2.

At the same time, the control volume 74 of the switching device 80 is vented via the non-return valve formed by the O-ring 84, whereby the control piston 132 moves downward, so that the piston rod 134 down from the housing of Pneumatic nailer 10 protrudes. The switching device 80 is thus in a second position.

FIG. 6 shows the arrangement from FIG. 5 shortly after the compressed-air nailer 10 has been removed from the workpiece, as a result of which the touch-down sensor 24 has returned to its lower basic position. As a result, the rocker 18 has pivoted about the pivot axis 38, while the trigger 14 remains actuated, for a distance against the triggering direction, so that the control valve 22 is no longer activated. The control pin 42 is again in its lower position, as shown in Figure 3.

The check valve formed by the O-ring 84 has the connection between the control volume 74 and the radial bore 44 of the control valve 22, which is again connected to outside air as shown in Figure 3, locked so that the pressure built up in the control volume 74 only slowly over the throttle 78 is reduced again. At the time shown in Figure 6, the pressure in the control volume 74 is still so large that the control piston 132 is held against the force of the spring 76 in its second position.

When the trigger 14 is actuated, this results in that the control surface 124 of the rocker 18 abuts against the piston rod 134, whereby a return movement of the rocker 18 about the pivot axis 38 is limited against the triggering direction and the rocker 18 remains in the position shown. This position of the rocker 18 corresponds to a contact release position of the power transmission device. It can be seen that a renewed actuation of the touch sensor leads to the time shown in Figure 6 to a contact trip, because the driver 36 will take the front end 34 of the rocker 18 from the drawn position upwards. In this case, therefore, the control valve 22 is driven again and the pressure in the control volume 74 is restored to a pressure in the housing interior 64 increased corresponding pressure, so that subsequent contact tripping are possible.

This applies until the pressure in the control volume 74 has been reduced by the throttle 78 so far that the control piston 132 returns to its first position. This is shown in FIG. It can be seen that, while the trigger 14 is still actuated, the rocker 18 is pivoted counter to the release direction relative to the position of FIG. In this position, the front end 34 of the rocker 18 is at a lateral distance from the driver 36 so that it is not detected by the driver 36 upon actuation of the Aufsetzfühlers 30.

Instead, an actuation of the Aufsetzfühlers 24, starting from the position of Figure 7 leads to the situation shown in Figure 8. It can be seen there that, despite simultaneously actuated trigger 14 and touch sensor 24, no activation of the control valve 22 takes place.

The explanation of a second embodiment is based on the figures 9 to 14. These figures show only a section of a Druckluftnaglers 10, which corresponds to the sectional views of Figures 3 to 8 of the first embodiment and contains compared to the first embodiment of modified elements. The remaining components of the pneumatic nailer 10 of the second embodiment are not shown again. They correspond to the first embodiment, as explained with reference to FIGS. 1 and 2. For the elements modified in the second exemplary embodiment, the same reference numerals are used as for the elements of the first exemplary embodiment that are comparable in terms of their function. Figure 9 shows a basic position of the pneumatic nailer 10 with non-actuated trigger 14 and non-actuated Aufsetzfühler 24. In the second embodiment, the control valve 22 is right, the switching device 80 arranged on the left. The rocker 18 is also pivotally mounted about a pivot axis 38 in the trigger 14, but not centrally, but at a rear end 126 of the rocker 18. The button 20, which cooperates with the control pin 42 of the control valve 22 is located in a middle Section of the rocker 18. The front end 34 of the rocker 18 is slightly more angled downwards than in the first embodiment and also has a slot-shaped opening 128 through which the piston rod 134 of the control piston 132 is passed. The piston rod 134 has a head 130 which engages behind the edges of the slot-shaped opening 128, so that the piston rod 134 can pull the front end 34 of the rocker 18 upwards in the direction of the control piston 132. Unlike in the first embodiment, the control volume 74 is located below the control piston 132, but is also connected to a throttle 78. In the basic position of FIG. 9, the control piston 132 or the switching device 80 is in a first position.

With respect to the control valve 22 and the connections of the individual spaces of the control valve 22 with the housing interior 64 of the first control line 82 and the control volume 74 via a non-return valve formed by the O-ring 84 arise over the first embodiment, with the exception of the partially deviating arrangement of the individual elements no changes. The function of these elements will therefore not be explained again. Instead, a typical workflow will be described with reference to the other figures.

Figure 10 shows the arrangement of Figure 9 after the landing sensor 24 has been actuated. As in the first embodiment, thereby the front end 34 of the rocker was lifted by the driver 36 of the slider 30, so that the drawn position has resulted. The piston rod 134 does not hinder this upward movement of the rocker 18, since the slot 128 in the front end 34 of the rocker 18 is sufficiently large. Since the trigger 14 has not yet been actuated, the button 20 is still at a distance from the control pin 42 and the control valve 22 has not yet been activated.

FIG. 11 shows the arrangement of FIG. 10 after the trigger 14 has been actuated while the touch sensor 24 is still actuated. This has already led to a single trip, since the button 20 has shifted the control pin 42 of the control valve 22 upwards. At the same time, compressed air was introduced into the control volume 74 via the check valve formed by the O-ring 84, so that the control piston 132 with the piston rod 134 has moved upwards into a second position. This corresponds to the second position of the switching device 80.

After removal of the pneumatic nailer 10 from the workpiece, the setting sensor 24 with the slider 30 has moved downwards again, so that the position shown in FIG. 12 results. It can be seen that the rocker 18 has swung back a bit against the triggering direction, so that the control pin 42 has moved back into its basic position and the control valve 22 is no longer activated. As in the first embodiment, the air now escapes from the control volume 74 slowly via the throttle 78th

As long as the pressure in the control volume 74 is so high that the control piston 132 remains in the second position against the force of the spring 76, the head 130 of the piston rod 134 prevents the rocker 18 from moving further back against the release direction than in FIG shown. Therefore, the front end 34 of the rocker 18 is in a position in which it is detected by an upward movement of the driver 36, so that a further control of the control valve 22 takes place. In the figure 12, the rocker 18 is thus in a position corresponding to the contact release position of the power transmission device.

Starting from the state of FIG. 12, the pressure in the control volume 74 decreases slowly as long as no further driving operation is triggered. Optionally, the control piston 132 returns after a predetermined time back to its first, shown in Figure 9 position.

This is shown in FIG. It can be seen that the front end 34 of the rocker is in this embodiment at a lateral distance from the driver 36 so that it is not detected by the driver 36 in an upward movement of the slider 30. Instead, the driver 36 moves laterally past the front end 34 and it comes despite continued actuated trigger 14 does not trigger a contact. This is illustrated for the second embodiment in FIG.

List of reference numbers used:

10 Pneumatic rodents

12 handle

14 triggers

16 pivot axis

18 seesaw

20 button

22 control valve

24 touch sensor

26 estuary

28 muzzle s tool

30 slides

32 slot

34 front end

36 drivers

38 pivot axis

40 Upper O-ring

42 control pin

44 Radial bore

46 recording

48 magazine

50 driving rams

52 working pistons

54 working cylinder

56 main valve

58 pilot valve

60 Lower O-ring

62 annular gap

64 housing interior

66 sleeve

68 control cylinders

70 annular gap 72 room

74 control volume

76 spring

78 throttle

80 switching device

82 First control line

84 O-ring

86 bore

88 triangle nut

90 Radial bore

92 spring

94 control piston

96 guide sleeve

98 guide pin

100 lower O-ring

102 spring

104 Middle O-ring

106 Upper O-ring

110 main control line

112 Radial bore

114 room

116 Main Valve Actuator

118 O-ring

120 spring

122 ring surface

124 control surface

126 Rear end

128 opening

130 head

132 control piston

134 piston rod

140 Lower housing part

142 housing cap

Claims

Expectations:

1. Include a pneumatic nailer (10).

• a working piston (52), which is connected to a driving plunger (50) for driving in a fastener and is supplied with compressed air when a driving process is triggered,

• a triggering device which has a manually operable trigger (14), a contact sensor (24) and a force transmission device which, in a single triggering operation, activates a control valve (22) as a result of an actuation of the trigger (14) when the contact sensor (24) is actuated, which triggers a driving process triggers, and

• a switching device (80), which can move the force transmission device for a contact release operation into a contact release position, in which the force transmission device controls the control valve (22) when the trigger is actuated as a result of an actuation of the contact sensor (24), whereby

• the switching device (80) has a first position assigned to the individual tripping operation and a second position assigned to the contact tripping operation,

• when a driving process is triggered, the switching device (80) is moved to the second position,

• the switching device (80) has a control piston (132) which is movable between the first position and the second position and is designed to move the force transmission device into the contact release position or to hold it in the contact release position,

• wherein the control piston (132) is guided in a control cylinder (68) which has a control volume (74), the control piston (132) being under pressure or if a predetermined pressure in the control volume (74) is exceeded, it is shifted into the first position, characterized in that

• the control volume (74) is ventilated or vented by the control valve (22) when a driving process is triggered.

2. Compressed air nailer (10) according to claim 1, characterized in that the switching device (80) has a time control, so that the switching device (80) returns from the second position to the first position after a predetermined time if no driving process is triggered .

3. Compressed air nailer (10) according to claim 1 or 2, characterized in that the control volume (74) is ventilated or vented via a check valve.

4. Compressed air nailer (10) according to claim 2 or 3, characterized in that the time control has a throttle (78) which is connected to the control volume (74).

5. Pneumatic nailer (10) according to one of claims 1 to 4, characterized in that the force transmission device has a movably mounted force transmission element with a button (20) for actuating the control valve (22), the force transmission element being arranged in the contact release position of the force transmission device that it is taken along by a driver (36) of the power transmission device connected to the attachment sensor (24) and carries out a movement in a release direction.

6. Pneumatic nailer (10) according to claim 5, characterized in that the switching device (80) is designed to be in the second position To limit movement of the force transmission element counter to the release direction.

7. Pneumatic nailer (10) according to claim 5 or 6, characterized in that the force transmission element is a rocker (18) which is pivotably mounted in the trigger (14) about a pivot axis (38) and has the button (20), and that the Movement is a pivoting movement about the pivot axis (38).

8. Compressed air nailer (10) according to claim 7, characterized in that the control piston (132) has a piston rod (134) which in the second position of the control piston (132) on a relative to the pivot axis (38) of the rocker (18). Button (20) of the rocker (18) can rest on the opposite control surface (124) of the rocker (18).

9. Compressed air nailer (10) according to claim 7, characterized in that the control piston (132) has a piston rod (134) which is passed through an opening (128) in the rocker (18), so that the piston rod (134) moves the rocker (18) can pull towards the control piston (132).

10. Compressed air nailer (10) according to one of claims 1 to 9, characterized in that the control valve (22) and the control piston (132) are combined in a valve block.

11. Compressed air nailer (10) according to one of claims 1 to 10, characterized in that a pneumatic connection between the control valve (22) and the control volume (74), via which the control volume (74) is ventilated or vented by the control valve (22). is, has a total volume that is smaller than the control volume (74).

12. Compressed air nailer (10) according to claim 11, characterized in that the pneumatic connection is arranged within the valve block.

13. Compressed air nailer (10) according to one of claims 1 to 12, characterized in that the size of the control volume (74) is a maximum of 5% of the size of a working volume of a working cylinder in which the working piston (52) is guided.