EP3403769B1 - Driving tool for driving fastening means into workpieces - Google Patents

Driving tool for driving fastening means into workpieces Download PDF

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Publication number
EP3403769B1
EP3403769B1 EP18169277.3A EP18169277A EP3403769B1 EP 3403769 B1 EP3403769 B1 EP 3403769B1 EP 18169277 A EP18169277 A EP 18169277A EP 3403769 B1 EP3403769 B1 EP 3403769B1
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EP
European Patent Office
Prior art keywords
centering
balls
driving
driving tool
tool according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18169277.3A
Other languages
German (de)
French (fr)
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EP3403769A2 (en
EP3403769A3 (en
Inventor
Joachim Bauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joh Friedrich Behrens AG
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Joh Friedrich Behrens AG
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Publication of EP3403769A2 publication Critical patent/EP3403769A2/en
Publication of EP3403769A3 publication Critical patent/EP3403769A3/en
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Publication of EP3403769B1 publication Critical patent/EP3403769B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/18—Details and accessories, e.g. splinter guards, spall minimisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B27F7/02—Nailing machines
    • B27F7/05—Driving means
    • B27F7/09—Driving means operated by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B27F7/02—Nailing machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/18—Details and accessories, e.g. splinter guards, spall minimisers
    • B25C1/188—Arrangements at the forward end of the barrel, e.g. splinter guards, spall minimisers, safety arrangements, silencers, bolt retainers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
    • B27F7/00—Nailing or stapling; Nailed or stapled work
    • B27F7/02—Nailing machines
    • B27F7/13—Nail feeding devices

Definitions

  • the invention relates to a driving tool for driving fasteners into workpieces.
  • Driving-in devices of the type according to the invention have a drive device in a device housing and a muzzle tool protruding from the lower end of the device housing with a driving-in channel.
  • a driving plunger protrudes into the driving channel and is connected to the drive device at the top.
  • a magazine for fasteners is laterally connected to the drive channel in order to supply fasteners to the drive channel.
  • the object of the invention is to provide a driving tool with a better centering of nails, pins and similar fastening means.
  • the fastener When a nail, pin or similar fastener is driven into a workpiece, the fastener with its shaft enters the centering opening of the nail centering after exiting the driving channel. When the shaft passes through the centering opening, the balls are pressed apart radially against the action of the elastic ring, so that the shaft is centered. When a nail head passes thereafter, the balls are pushed further apart. When the fastener has completely passed through the centering opening, the ring presses the balls together again. A particularly precise centering is achieved by the simultaneous abutment of several balls on the fastening means. In addition, fasteners with widely differing diameters can be centered with the same centering device.
  • the mouth tool can be placed on the workpiece with the underside of the centering housing in order to ensure a uniform driving depth and an alignment of the fastening means perpendicular to the workpiece surface.
  • the elastic ring is a snap ring. According to other designs, it is an O-ring or a Seegerring.
  • concentrically arranged rings of balls are arranged in at least one plane in the centering housing, the centering opening being defined by the balls of an inner ring, the balls of an outer ring lie against the balls of an inner ring and lie against the balls of one outer ring with an elastic ring under tension.
  • the balls of the outer ring serve to transmit the force exerted by the snap ring to the balls of the inner ring. This favors use of large diameter elastic rings, long spring travel and the use of fasteners with different diameters.
  • the balls of the ring delimiting the centering opening abut one another. This is the case in the initial state of nail centering when no fastener passes through the centering opening. This enables a simple construction of the nail centering. In order to adapt to the dimensions of the fastening means used, it can be achieved in other embodiments by means of corresponding contact surfaces of the centering housing for the balls that they do not abut one another in the initial state.
  • the balls made of concentrically arranged rings lie against one another at their equators. This is advantageous for the power transmission.
  • the ring lies on the outside of the equator of the balls of a ring. This is also advantageous for the power transmission.
  • the nail centering has a plurality of rings of balls arranged one above the other, each of which delimits a centering opening.
  • the nail centering has at least one arrangement of exactly two crown rings of balls arranged one above the other and / or at least one arrangement of exactly two concentric rings of balls.
  • the centering housing is in the form of a circular disk, has a central centering channel and, in at least one plane, a plurality of radial ball guide channels, each starting from the outer circumference of the centering housing and opening into the centering channel, if balls are arranged in the ball guide channels, the centering housing has a circumferential groove on the outer circumference on, which intersects the outer ends of a plurality of ball guide channels, and an elastic ring is inserted into the groove, which rests under prestress on the outside of several balls, whereby balls are partially pressed into the centering channel, between which the centering opening is defined.
  • This type of construction is structurally particularly simple and robust.
  • the ring is centered in the groove with respect to the centering channel. Balls are saved through the radial ball guide channels.
  • the centering housing has exactly three ball guide channels in each plane, in which balls are arranged.
  • the centering housing has at least one radially extending threaded hole, which extends from the outer circumference to an extension at the upper end of the centering channel, the lower end of the mouth tool is inserted into the extension and a clamping screw is inserted into the threaded hole by means of the centering housing is clamped to the muzzle tool.
  • the underside of the centering housing is the lower end of the mouth tool, with which the pressure cylinder can be placed on the workpiece.
  • the underside of the centering housing is annular. This avoids imprints of the muzzle tool on the workpiece, since the centering housing can rest on the workpiece with a large area. Furthermore, driving the fastener perpendicular to the workpiece surface is promoted by large-area contact of the centering housing.
  • O-rings are arranged between the balls of an inner ring and the balls of an outer ring.
  • the drive device is designed so that it is driven by means of compressed air, by gas explosion or by means of electrical current.
  • These types of designs are also referred to as pneumatic nailers, gas pressure nailers or electronic nailers.
  • the nail centering can also be used for driving tools with other drive devices.
  • the driving tool is a driving tool which can be handled with only one hand (hand tool) or a driving tool held at a displacement device or a stationary driving tool.
  • a drive-in device held on a displacement device can in particular be a drive-in device arranged on a portal-like, movable woodworking bridge.
  • the information “above” and “below” and information derived therefrom such as “above” and “below” and “vertical” and “horizontal” relate to an alignment of the driving tool with the master cylinder above the pressure cylinder and the lower opening of the muzzle tool at the lower end of the driving tool.
  • a driving tool 1 is arranged on a bridge 2 above a workpiece 3. Only one horizontal beam from bridge 2 is shown.
  • the bridge is portal-shaped, with the two vertical posts being guided on rails on both sides of a work table and being displaceable in the horizontal direction.
  • the driving tool 1 comprises a master cylinder 4 in a housing 5, a pressure cylinder 6 arranged below the housing 5, a mouth tool 7 protruding from the underside of the pressure cylinder and a magazine 8 arranged on the side of the mouth tool Flange 6.1.
  • the master cylinder 4 is circular cylindrical or oval on the inside.
  • the master cylinder 4 is closed at the top by a cover 9.
  • the hexagon head of a first screw 11 sits in a central, hexagonal recess 10 in the underside of the cover 9, the threaded shaft of which is guided through a central bore in the cover 9 and protrudes from the cover 9 at the top.
  • the first screw 11 is used for attachment to the bridge 2.
  • a piston 12 is guided vertically displaceably in the master cylinder 4.
  • the piston is sealed off from the master cylinder 4 via first and second O-rings 13, 14.
  • a piston rod 15 projects downward from the underside of the piston 12.
  • the piston rod 15 is connected to the piston 12 by means of a second screw 16.
  • the master cylinder 4 has a sealing element 17, which is designed as a first base plate.
  • the sealing element 17 has a first through hole 18 in the center in the form of a guide bush, through which the piston rod 15 is guided, so that it protrudes from the sealing element 17 at the bottom.
  • a third O-ring is held in a groove, which seals it against the master cylinder 4.
  • the piston rod 15 is sealed against the sealing element 17 by a fourth O-ring 19 held in the sealing element 17.
  • first air chamber 20 in the master cylinder 4 and below the piston 12 there is a second air chamber 21.
  • the first air chamber 20 is connected to an externally accessible first air inlet 22 and the second chamber is connected to an externally accessible second air inlet 23.
  • the pressure cylinder 6 is essentially box-shaped on the outside and has a circular or oval cross section on the inside. At the bottom, the pressure cylinder 6 has a second base plate 24 with a second through hole 25.
  • the mouth tool 7 is attached to the underside of the second base plate 24. It has a drive-in channel 26 which has an upper opening 27 at the top, a lower opening 28 at the lower end of the mouth tool 7 and a lateral opening 29 on the side. At the side opening 29, the drum-shaped magazine 8 for fasteners is connected with its discharge opening.
  • a driving tappet 30 projects with a lower section through the second through hole 25 and the upper opening 27 into the driving channel 26.
  • the upper section of the driving plunger 30 is attached to the bottom of the piston rod 15.
  • the driving plunger 30 has an external thread 31 at the top, which is screwed into a threaded bore on the underside of the piston rod 15.
  • a first holding device 32 has a first holding element 33 projecting radially from the piston rod 15. This is a circular disk-shaped projection that runs around the central axis of the piston rod.
  • the first holding element 33 has a pot-shaped shape 34 in the center, into which the lower end of the piston rod 15 is inserted.
  • the driving plunger 30 is passed through a central hole in the formation and screwed into the piston rod 15.
  • a collar 35 on the outer circumference of the driving plunger 30 bears against the underside of the formation 34, so that the first holding element 33 is fixed between the piston rod 15 and the driving plunger 30.
  • the first holding device 32 has a second holding element 36 connected to the pressure cylinder 6.
  • the second holding element 36 is a projection protruding radially inward from the pressure cylinder 6. This is a circular disc formed, which is arranged vertically displaceable in a first extension 37 at the upper end of the pressure cylinder 6.
  • a first stop device 38 has a first stop element 39 connected to the piston rod and a second stop element 40 connected to the pressure cylinder 6.
  • the first holding element 33 is also the first stop element 39.
  • the second stop element 40 is a ring which is held by an adjusting device 41 in the vicinity of the second base plate 24.
  • the adjusting device 41 comprises an adjusting ring 42, which has an internal thread 43, into which the second stop element 40 is screwed with an external thread 44. In the area of the external thread 44, the second stop element 40 has a reduced external diameter.
  • the underside of the adjusting ring 42 lies against the upper side of the second base plate 24. At the top, the adjusting ring 42 is guided on a shoulder 45 of the pressure cylinder 6. The adjusting ring 42 is thus caught between the shoulder 45 and the second base plate 24, so that it cannot be displaced vertically, but rather can only be rotated about the vertical axis.
  • the adjusting ring 42 has a plurality of first blind bores 46, into which a pin for rotating the adjusting ring 42 can be inserted from the outside through a slot 47 in the pressure cylinder 6 ( Fig. 1 ).
  • the second stop element 40 has a plurality of vertical threaded bores 48 on the underside, into which stud bolts 49 are screwed, which are guided axially displaceably in second bores 24.1 of the second base plate 24.
  • the second bores 24.1 of the second base plate 24 and the stud bolts 49 form a linear guide 50.
  • the second stop element 40 can be displaced in the vertical direction, since the stud bolts 49 prevent it from rotating with the adjusting ring 42.
  • a second holding device 51 which has a third holding element 52 connected to the piston rod 15 and a fourth holding element 53 connected to the pressure cylinder 6.
  • the fourth holding element 53 is a nail centering 54 at the lower end of the mouth tool 7.
  • the nail centering 54 has a circular disk-shaped centering housing 55 with a vertical centering channel 56, which is aligned with the drive-in channel 26 ( Fig. 7 ).
  • the centering housing 55 two concentric rings 59, 60, 61, 62 of balls 63 are arranged in two radial planes one above the other in three radial ball guide channels 57 around a centering opening 58.
  • the balls 63 of the two inner rims 59, 61 arranged one above the other partially protrude into the centering channel 56, adjacent balls 63 being supported on one another and delimiting a centering opening.
  • Adjacent balls 63 of the outer rings 60, 62 and the inner rings 59, 61 lie against one another at their equator.
  • the centering housing 55 has a circumferential groove 64, 65 in the equatorial plane of the upper rings 59, 60 and the lower rings 61, 62, which extends into the ball guide channels 57 in the centering housing 55, in which the balls 63 are arranged.
  • each groove 64, 65 there is a snap ring 66, 67, which presses against the balls 63 of the outer ring 60, 62 under elastic pretension, which in turn press the balls 63 of the inner rings 59, 61 into contact with one another in the centering channel 56, so that the centering opening 58 remains between the balls 63 of the inner rings 59, 61.
  • O-rings 68, 69 are arranged between the balls 63 of the inner rings 59, 61 and the outer rings 60, 62 by different diameters of standardized balls 63 and snap rings Compensate 66, 67 so that the balls 63 of the inner rings 59, 61 each abut each other.
  • the fourth holding element 52 consists of circumferential, superimposed grooves 72, 73 in a lower section of the driving plunger.
  • the grooves 72, 73 are slightly rounded, corresponding to the outer contour of the balls 63 of the nail centering 54.
  • the distance between the two grooves 72, 73 corresponds to the distance between the rims 59, 60, 61, 62 arranged one above the other.
  • a third holding device 74 which has a fifth holding element 75 on the master cylinder 4 and a sixth holding element 76 on the pressure cylinder 6.
  • the third holding device 74 comprises a magnetic coupling 77, which has a first magnetic coupling element 78 connected to the master cylinder 4 and a second magnetic coupling element 79 connected to the pressure cylinder 6.
  • the first magnetic coupling element 78 has circular-disc-shaped permanent magnets 80 which are fastened by means of fourth screws 81 to the lower ends of first rods 82 which are guided in vertical first bores 83 of the housing 5.
  • first disks 85 are fastened by means of fifth screws 84, which protrude radially outwards with respect to the rods 82.
  • the first disks 85 are arranged in second extensions 86 of the first bores 83 and limit the downward displacement of the first rods 82 by abutment on a shoulder at the lower end of the second extensions 86.
  • the upward displacement of the first rods 82 is limited by the permanent magnets 80 projecting radially with respect to the first rods 82 against the underside of the housing 5.
  • the fourth magnetic coupling element 79 is designed as an annular disk made of a ferromagnetic material, which is attached to the upper end of the pressure cylinder 6.
  • the third holding device 74 comprises a second stop device 87, which has a third stop element 88 on the master cylinder 4 and a fourth stop element 89 on the pressure cylinder 6.
  • the fourth stop element 88 is a radially inwardly projecting part of the second magnetic coupling element 79 and the third stop element 89 is the underside of the sealing element 17.
  • the second magnetic coupling element 79 limits the upward displacement of the pressure cylinder 6 by abutment on the underside of the sealing element 17. Furthermore, it covers the first extension 37 of the pressure cylinder 6 at the top and limits the displacement of the second holding element 36 upwards. The downward movement of the second holding element 36 is limited by the bottom of the first extension 37.
  • the pins 91 engage in holes 92 in the second magnetic coupling element 79.
  • the pins 91 do not protrude above the top of the second magnetic coupling element 79 ( Fig. 3 ).
  • the pins 91 are pushed out of the holes 92 at the top ( Fig. 2 ).
  • a holder 93 of the magazine 8 is attached to the pressure cylinder 6.
  • the lower end of the mouth tool 7 is inserted into an extension 94 of the centering channel 56 of the nail centering 54 and clamped therein by means of a clamping screw screwed into a threaded bore 95.
  • the flange 6.1 of the pressure cylinder 6 is fastened by means of sixth screws 96 to second rods 97 which are guided in vertical third bores 98 in the housing 5.
  • Fig. 1 and 2 show the first driving tool 1 in a starting position in which the mouth tool 7 with the nail centering 54 is not seated on the workpiece 3.
  • the piston 12 is held in the upper piston position by compressed air fed into the second air chamber 20, in which it rests on the cover 9.
  • the first holding element 33 is maximally raised by the piston rod 15, so that the second holding element 36 bears against the underside of the sixth holding element 76.
  • the first magnetic coupling element 78 is pushed away from the second magnetic coupling element 79 by the pins 91.
  • Fig. 3 is displaced by feeding compressed air into the first air chamber 20 and venting the second air chamber 21, the piston 12 and thus the first holding element 33 down.
  • the second holding element 36 and thus the pressure cylinder 6 move downward until the mouth tool 7 with the nail centering 54 is seated on the workpiece 3. This provides a defined starting position for driving a nail 99 or other fastening means into the workpiece 3.
  • Fig. 4 Further compressed air is then introduced into the first air chamber 20 and a nail 99 fed into the drive channel 26 from the magazine 8 is driven into the workpiece 3 until the first stop element 39 abuts the second stop element 40. Then the nail 99 is driven into the workpiece 3 at a defined depth of penetration.
  • the penetration depth is determined by the vertical position of the second stop element 40, which can be adjusted from the outside by turning the adjusting ring 42.
  • Fig. 4 shows the driving tool with the nail 99 driven in at the predetermined penetration depth.
  • the lower part of the driving plunger 30 also engages in the centering channel 56.
  • the balls 63 of the two inner rings 59, 61 engage in the two grooves 72, 73 and are held in place by the snap rings 66, 67.
  • the pressure cylinder 6 By contacting the sixth holding element 76 on the first base plate 17, the pressure cylinder 6 is prevented from moving further upward and the driving plunger 30 is pulled out of the nail centering 54.
  • the pins 91 release the first magnetic coupling 77.
  • the pressure cylinder 6 is held by the first holding element 33 against the second holding element 36 and the second holding element 36 against the sixth holding element 76. This is in Fig. 6 shown.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Die Erfindung betrifft ein Eintreibgerät zum Eintreiben von Befestigungsmitteln in Werkstücke.The invention relates to a driving tool for driving fasteners into workpieces.

Eintreibgeräte der erfindungsgemäßen Art weisen eine Antriebseinrichtung in einem Gerätegehäuse und ein vom unteren Ende des Gerätegehäuses vorstehendes Mündungswerkzeug mit einem Eintreibkanal auf. Ein Eintreibstößel ragt in den Eintreibkanal hinein und ist oben mit der Antriebseinrichtung verbunden. Ein Magazin für Befestigungsmittel ist seitlich an den Eintreibkanal angeschlossen, um dem Eintreibkanal Befestigungsmittel zuzuführen. Beim Eintreiben von Nägeln oder Stiften kann es zur Fehlausrichtung des Befestigungsmittels im Werkstück durch eine schiefe Ausrichtung des Befestigungsmittels im Eintreibkanal kommen. Diese kann darauf beruhen, dass das Befestigungsmittel den Eintreibkanal teilweise ausfüllt und unzureichend geführt ist. Bei Nägeln kann zudem die Nagelspitze gegenüber dem breiteren Nagelkopf kippen.Driving-in devices of the type according to the invention have a drive device in a device housing and a muzzle tool protruding from the lower end of the device housing with a driving-in channel. A driving plunger protrudes into the driving channel and is connected to the drive device at the top. A magazine for fasteners is laterally connected to the drive channel in order to supply fasteners to the drive channel. When driving in nails or pins, the fastener can be misaligned in the workpiece due to an oblique alignment of the fastener in the driving channel. This can be based on the fact that the fastening means partially fills the driving channel and is insufficiently guided. With nails, the tip of the nail can also tip over the wider nail head.

Bereits bekannt sind Eintreibgeräte mit einer Nagelzentrierung am unteren Ende des Mündungswerkzeugs. Hierbei handelt es sich um zwei schwenkbar am unteren Ende des Mündungswerkzeugs gelagerte Klappen, die durch Federn zusammen geschwenkt werden. In der zusammengeschwenkten Stellung ist zwischen den beiden Klappen eine Zentrieröffnung vorhanden. In der Zentrieröffnung werden die aus dem Eintreibkanal austretenden Nägel zentriert, wobei die Klappen beim Durchgang des breiteren Nagelkopfes etwas auseinanderschwenken. Zum Zentrieren von Nägeln mit unterschiedlichen Durchmessern weist die Zentrieröffnung eine ovale Querschnittsform auf. Nachteilig ist, dass die Federn unterschiedlich ermüden, sodass die Klappen ungleichmäßig zusammengedrückt werden und Zentrierfehler entstehen. Zudem kann dieselbe Nagelzentrierung nur für Nägel mit geringfügig unterschiedlichen Durchmessern verwendet werden. Schließlich behindert ein Aufsetzen des Mündungswerkzeugs auf ein Werkstück das Ausfedern der Klappen. Ein Beispiel einer solchen Vorrichtung ist in US3060437 offenbart.Driving-in devices with nail centering at the lower end of the muzzle tool are already known. These are two hinged flaps at the lower end of the muzzle tool, which are pivoted together by springs. In the swiveled position, a centering opening is present between the two flaps. The nails emerging from the driving channel are centered in the centering opening, the flaps pivoting slightly apart as the wider nail head passes through. The centering opening has an oval cross-sectional shape for centering nails with different diameters. It is disadvantageous that the springs tire differently, so that the flaps are compressed unevenly and centering errors occur. In addition, the same nail centering can only be used for nails with slightly different diameters. Finally, placing the muzzle tool on a workpiece prevents the flaps from rebounding. An example of such a device is shown in US3060437 disclosed.

Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, ein Eintreibgerät mit einer besseren Zentrierung von Nägeln, Stiften und ähnlichen Befestigungsmitteln zur Verfügung zu stellen.Proceeding from this, the object of the invention is to provide a driving tool with a better centering of nails, pins and similar fastening means.

Die Aufgabe wird durch ein Eintreibgerät mit den Merkmalen von Anspruch 1 gelöst. Vorteilhafte Ausführungsarten des Eintreibgeräts sind in Unteransprüchen angegeben.The object is achieved by a driving tool with the features of claim 1. Advantageous embodiments of the driving tool are specified in the subclaims.

Das erfindungsgemäße Eintreibgerät zum Eintreiben von Befestigungsmitteln in Werkstücke umfasst

  • eine Antriebseinrichtung in einem Gehäuse,
  • ein vom unteren Ende des Gehäuses vorstehendes Mündungswerkzeug mit einem Eintreibkanal,
  • einen Eintreibstößel, der in den Eintreibkanal hineinragt und oben mit der Antriebseinrichtung verbunden ist,
  • ein Magazin für Befestigungsmittel, das an den Eintreibkanal angeschlossen ist, um dem Eintreibkanal Befestigungsmittel zuzuführen, und
  • eine Nagelzentrierung unten am Mündungswerkzeug, die eine Zentrieröffnung aufweist, die von in radialer Richtung beweglichen Führungselementen begrenzt ist, die von mindestens einer Federeinrichtung zur Zentrieröffnung hin vorgespannt sind,
    dadurch gekennzeichnet, dass
    • die Nagelzentrierung ein Zentriergehäuse umfasst, in dem mindestens ein Kranz Kugeln angeordnet ist, zwischen denen die Zentrieröffnung definiert ist, und
    • die Fehlereinrichtung ein elastischer Ring ist, der unter Vorspannung außen an den Kugeln anliegt.
The driving tool according to the invention for driving fasteners into workpieces comprises
  • a drive device in a housing,
  • a muzzle tool protruding from the lower end of the housing with a drive-in channel,
  • a driving tappet which projects into the driving channel and is connected to the drive device at the top,
  • a fastener magazine connected to the drive channel to supply fasteners to the drive channel, and
  • a nail centering at the bottom of the muzzle tool, which has a centering opening which is delimited by guide elements which can be moved in the radial direction and are biased towards the centering opening by at least one spring device,
    characterized in that
    • the nail centering comprises a centering housing, in which at least one ring of balls is arranged, between which the centering opening is defined, and
    • the error device is an elastic ring, which rests on the outside of the balls under prestress.

Beim Eintreiben eines Nagels, Stiftes oder ähnlichen Befestigungsmittels in ein Werkstück tritt das Befestigungsmittel nach dem Austritt aus dem Eintreibkanal mit seinem Schaft in die Zentrieröffnung der Nagelzentrierung ein. Beim Hindurchtreten des Schaftes durch die Zentrieröffnung werden die Kugeln entgegen der Wirkung des elastischen Rings radial etwas auseinandergedrückt, so dass der Schaft zentriert wird. Beim darauffolgenden Hindurchtreten eines Nagelkopfes werden die Kugeln weiter auseinandergedrückt. Wenn das Befestigungsmittel vollständig durch die Zentrieröffnung hindurchgetreten ist, drückt der Ring die Kugeln wieder zusammen. Durch das gleichzeitige Anliegen mehrerer Kugeln am Befestigungsmittel wird eine besonders genaue Zentrierung erreicht. Zudem können Befestigungsmittel mit stark abweichenden Durchmessern mit derselben Zentriereinrichtung zentriert werden. Auch wenn der Ring allmählich ermüdet, werden die Kugeln gleichmäßig gegen das Befestigungsmittel gedrückt und Zentrierfehler vermieden. Ein weiterer Vorteil besteht darin, dass das Mündungswerkzeug mit der Unterseite des Zentriergehäuses auf das Werkstück aufgesetzt werden kann, um eine gleichmäßige Eintreibtiefe und eine Ausrichtung des Befestigungsmittels senkrecht zur Werkstückoberfläche zu gewährleisten.When a nail, pin or similar fastener is driven into a workpiece, the fastener with its shaft enters the centering opening of the nail centering after exiting the driving channel. When the shaft passes through the centering opening, the balls are pressed apart radially against the action of the elastic ring, so that the shaft is centered. When a nail head passes thereafter, the balls are pushed further apart. When the fastener has completely passed through the centering opening, the ring presses the balls together again. A particularly precise centering is achieved by the simultaneous abutment of several balls on the fastening means. In addition, fasteners with widely differing diameters can be centered with the same centering device. Even if the ring gradually tires, the balls are pressed evenly against the fastener and centering errors avoided. Another advantage is that the mouth tool can be placed on the workpiece with the underside of the centering housing in order to ensure a uniform driving depth and an alignment of the fastening means perpendicular to the workpiece surface.

Gemäß einer Ausführungsart der Erfindung ist der elastische Ring ein Sprengring. Gemäß anderen Ausführungsarten ist er ein O-Ring oder ein Seegerring.According to one embodiment of the invention, the elastic ring is a snap ring. According to other designs, it is an O-ring or a Seegerring.

Gemäß einer Ausführungsart der Erfindung sind im Zentriergehäuse in mindestens einer Ebene konzentrisch angeordnete Kränze aus Kugeln angeordnet, wobei die Zentrieröffnung durch die Kugeln eines inneren Kranzes definiert ist, liegen die Kugeln eines äußeren Kranzes an den Kugeln eines inneren Kranzes an und liegt an den Kugeln eines äußeren Kranzes ein elastischer Ring unter Vorspannung an. Hierbei dienen die Kugeln des äußeren Kranzes der Übertragung der vom Sprengring ausgeübten Kraft auf die Kugeln des inneren Kranzes. Dies begünstigt die Verwendung von elastischen Ringen mit großem Durchmesser, lange Federwege und den Gebrauch von Befestigungsmitteln mit unterschiedlichen Durchmessern.According to one embodiment of the invention, concentrically arranged rings of balls are arranged in at least one plane in the centering housing, the centering opening being defined by the balls of an inner ring, the balls of an outer ring lie against the balls of an inner ring and lie against the balls of one outer ring with an elastic ring under tension. Here, the balls of the outer ring serve to transmit the force exerted by the snap ring to the balls of the inner ring. This favors use of large diameter elastic rings, long spring travel and the use of fasteners with different diameters.

Gemäß einer weiteren Ausführungsart liegen die Kugeln des die Zentrieröffnung begrenzenden Kranzes aneinander an. Dies ist im Ausgangszustand der Nagelzentrierung der Fall, wenn kein Befestigungsmittel durch die Zentrieröffnung hindurch tritt. Dies ermöglicht eine einfache Konstruktion der Nagelzentrierung. Zur Anpassung an die Abmessungen der verwendeten Befestigungsmittel kann bei anderen Ausführungsarten durch entsprechende Anlageflächen des Zentriergehäuses für die Kugeln erreicht werden, dass diese im Ausgangszustand nicht aneinander anliegen.According to a further embodiment, the balls of the ring delimiting the centering opening abut one another. This is the case in the initial state of nail centering when no fastener passes through the centering opening. This enables a simple construction of the nail centering. In order to adapt to the dimensions of the fastening means used, it can be achieved in other embodiments by means of corresponding contact surfaces of the centering housing for the balls that they do not abut one another in the initial state.

Gemäß einer weiteren Ausführungsart liegen die Kugeln aus konzentrisch angeordneten Kränzen an ihren Äquatoren aneinander an. Dies ist vorteilhaft für die Kraftübertragung.According to a further embodiment, the balls made of concentrically arranged rings lie against one another at their equators. This is advantageous for the power transmission.

Gemäß einer weiteren Ausführungsart liegt der Ring außen am Äquator der Kugeln eines Kranzes an. Auch dies ist vorteilhaft für die Kraftübertragung.According to a further embodiment, the ring lies on the outside of the equator of the balls of a ring. This is also advantageous for the power transmission.

Gemäß einer weiteren Ausführungsart weist die Nagelzentrierung mehrere übereinander angeordnete Kränze aus Kugeln auf, die jeweils eine Zentrieröffnung begrenzen. Infolgedessen wird ein durch die Nagelzentrierung hindurchtretendes Befestigungsmittel an zwei in Axialrichtung voneinander beabstandeten Bereichen zentriert. Hierdurch wird eine besonders genaue Zentrierung erreicht.According to a further embodiment, the nail centering has a plurality of rings of balls arranged one above the other, each of which delimits a centering opening. As a result, a fastener passing through the nail centering is centered at two regions spaced apart in the axial direction. A particularly precise centering is hereby achieved.

Gemäß einer weiteren Ausführungsart weist die Nagelzentrierung mindestens eine Anordnung aus genau zwei übereinander angeordneten Kränze aus Kugeln und/oder mindestens eine Anordnung aus genau zwei konzentrischen Kränzen aus Kugeln auf.According to a further embodiment, the nail centering has at least one arrangement of exactly two crown rings of balls arranged one above the other and / or at least one arrangement of exactly two concentric rings of balls.

Gemäß einer weiteren Ausführungsart ist das Zentriergehäuse kreisscheibenförmig, weist einen zentralen Zentrierkanal und in mindestens einer Ebene mehrere radiale Kugelführungskanäle auf, die jeweils vom Außenumfang des Zentriergehäuses ausgehen und im Zentrierkanal münden, sind in den Kugelführungskanälen Kugeln angeordnet, weist das Zentriergehäuse am Außenumfang eine umlaufende Nut auf, welche die äußeren Enden mehrerer Kugelführungskanäle schneidet, und ist in die Nut ein elastischer Ring eingesetzt, der unter Vorspannung außen an mehreren Kugeln anliegt, wodurch Kugeln teilweise in den Zentrierkanal hineingedrückt werden, zwischen denen die Zentrieröffnung definiert ist. Diese Ausführungsart ist konstruktiv besonders einfach und robust. In der Nut wird der Ring bezüglich des Zentrierkanals zentriert. Durch die radialen Kugelführungskanäle werden Kugeln eingespart. Gemäß einer weiteren Ausführungsart weist das Zentriergehäuse genau drei Kugelführungskanäle in jeder Ebene auf, in der Kugeln angeordnet sind.According to a further embodiment, the centering housing is in the form of a circular disk, has a central centering channel and, in at least one plane, a plurality of radial ball guide channels, each starting from the outer circumference of the centering housing and opening into the centering channel, if balls are arranged in the ball guide channels, the centering housing has a circumferential groove on the outer circumference on, which intersects the outer ends of a plurality of ball guide channels, and an elastic ring is inserted into the groove, which rests under prestress on the outside of several balls, whereby balls are partially pressed into the centering channel, between which the centering opening is defined. This type of construction is structurally particularly simple and robust. The ring is centered in the groove with respect to the centering channel. Balls are saved through the radial ball guide channels. According to a further embodiment, the centering housing has exactly three ball guide channels in each plane, in which balls are arranged.

Gemäß einer weiteren Ausführungsart weist das Zentriergehäuse mindestens eine radial erstreckte Gewindebohrung auf, die vom Außenumfang ausgehend bis zu einer Erweiterung am oberen Ende des Zentrierkanals erstreckt ist, ist das untere Ende des Mündungswerkzeugs in die Erweiterung eingesetzt und ist in die Gewindebohrung eine Klemmschraube eingesetzt, mittels der das Zentriergehäuse am Mündungswerkzeug festgeklemmt ist. Hierdurch wird eine besonders einfache und zuverlässige Fixierung der Nagelzentrierung am Mündungswerkzeug erreicht.According to a further embodiment, the centering housing has at least one radially extending threaded hole, which extends from the outer circumference to an extension at the upper end of the centering channel, the lower end of the mouth tool is inserted into the extension and a clamping screw is inserted into the threaded hole by means of the centering housing is clamped to the muzzle tool. In this way, a particularly simple and reliable fixation of the nail centering on the mouth tool is achieved.

Gemäß einer weiteren Ausführungsart ist die Unterseite des Zentriergehäuses das untere Ende des Mündungswerkzeuges, mit dem der Andruckzylinder auf das Werkstück aufsetzbar ist. Gemäß einer weiteren Ausführungsart ist die Unterseite des Zentriergehäuses kreisringförmig. Hierdurch werden Abdrücke des Mündungswerkzeuges auf dem Werkstück vermieden, da das Zentriergehäuse mit einer großen Fläche auf das Werkstück aufsetzen kann. Ferner wird durch großflächige Anlage des Zentriergehäuses ein Eintreiben des Befestigungsmittels senkrecht zur Werkstückoberfläche gefördert.According to a further embodiment, the underside of the centering housing is the lower end of the mouth tool, with which the pressure cylinder can be placed on the workpiece. According to a further embodiment, the underside of the centering housing is annular. This avoids imprints of the muzzle tool on the workpiece, since the centering housing can rest on the workpiece with a large area. Furthermore, driving the fastener perpendicular to the workpiece surface is promoted by large-area contact of the centering housing.

Gemäß einer weiteren Ausführungsart sind jeweils O-Ringe zwischen den Kugeln eines inneren Kranzes und den Kugeln eines äußeren Kranzes angeordnet. Hierdurch können unterschiedliche Durchmesser von genannten Kugeln und Sprengringen ausgeglichen werden.According to a further embodiment, O-rings are arranged between the balls of an inner ring and the balls of an outer ring. As a result, different diameters of the balls and snap rings mentioned can be compensated for.

Gemäß einer weiteren Ausführungsart ist die Antriebseinrichtung ausgebildet, sodass sie mittels Druckluft, durch Gasexplosion oder mit elektrischem Strom angetrieben ist. Diese Ausführungsarten werden auch als Druckluftnagler, Gasdrucknagler oder Elektronagler bezeichnet. Die Nagelzentrierung ist auch für Eintreibgeräte mit anderen Antriebseinrichtungen einsetzbar.According to a further embodiment, the drive device is designed so that it is driven by means of compressed air, by gas explosion or by means of electrical current. These types of designs are also referred to as pneumatic nailers, gas pressure nailers or electronic nailers. The nail centering can also be used for driving tools with other drive devices.

Gemäß einer weiteren Ausführungsart ist das Eintreibgerät ein bei der Anwendung mit nur einer Hand handhabbares Eintreibgerät (Handgerät) oder ein an einer Verlagerungseinrichtung gehaltenes Eintreibgerät oder ein stationär angeordnetes Eintreibgerät. Bei einem an einer Verlagerungseinrichtung gehaltenen Eintreibgerät kann es sich insbesondere um ein an einer portalartigen, verfahrbaren Holzbearbeitungsbrücke angeordnetes Eintreibgerät handeln.According to a further embodiment, the driving tool is a driving tool which can be handled with only one hand (hand tool) or a driving tool held at a displacement device or a stationary driving tool. A drive-in device held on a displacement device can in particular be a drive-in device arranged on a portal-like, movable woodworking bridge.

Gemäß einer vorteilhaften Ausführungsart weist das erfindungsgemäße Eintreibgerät zum Eintreiben von Befestigungsmitteln in Werkstücke folgende Merkmale auf:

  • eine Antriebseinrichtung mit einem translatorisch verlagerbaren Antriebselement in einem Gehäuse,
  • ein vom unteren Ende des Gehäuses vorstehendes Mündungswerkzeug mit einem Eintreibkanal, der eine obere Öffnung, eine seitliche Öffnung und eine untere Öffnung für den Austritt von Befestigungsmitteln aufweist,
  • einen Eintreibstößel, der durch die obere Öffnung in den Eintreibkanal hineinragt und oben mit dem Antriebselement verbunden ist,
  • ein Magazin für Befestigungsmittel, das an die seitliche Öffnung des Eintreibkanals angeschlossen ist, um dem Eintreibkanal Befestigungsmittel zuzuführen, und
  • eine Nagelzentrierung unten am Mündungswerkzeug, die eine Zentrieröffnung aufweist, die von mindestens einem in radialer Richtung beweglichen Führungselement begrenzt ist, das von mindestens einer Federeinrichtung in radialer Richtung zur Zentrieröffnung hin vorgespannt ist,
    dadurch gekennzeichnet, dass
    • die Nagelzentrierung ein Zentriergehäuse umfasst, in dem mindestens ein Kranz Kugeln angeordnet ist, zwischen denen die Zentrieröffnung definiert ist, und
    • die Federeinrichtung ein elastischer Ring ist, der unter Vorspannung außen an den Kugeln anliegt.
According to an advantageous embodiment, the driving tool according to the invention for driving fasteners into workpieces has the following features:
  • a drive device with a translationally displaceable drive element in a housing,
  • a muzzle tool protruding from the lower end of the housing with a drive-in channel which has an upper opening, a lateral opening and a lower opening for the outlet of fastening means,
  • a driving tappet, which projects through the upper opening into the driving channel and is connected at the top to the drive element,
  • a magazine for fasteners, which is connected to the lateral opening of the drive channel in order to supply fasteners to the drive channel, and
  • a nail centering at the bottom of the mouth tool, which has a centering opening which is delimited by at least one guide element which is movable in the radial direction and which is biased in the radial direction towards the centering opening by at least one spring device,
    characterized in that
    • the nail centering comprises a centering housing, in which at least one ring of balls is arranged, between which the centering opening is defined, and
    • the spring device is an elastic ring which bears on the outside of the balls under prestress.

Die vorstehende Ausführungsart weist vorteilhaft die Merkmale eines oder mehrerer der Unteransprüche oder der zuvor beschriebenen Ausführungsarten auf.The above embodiment advantageously has the features of one or more of the subclaims or the previously described embodiments.

Nachfolgend wird die Erfindung anhand der anliegenden Zeichnungen von Ausführungsbeispielen näher erläutert. In den Zeichnungen zeigen:

Fig. 1
ein Eintreibgerät umfassend eine Nagelzentrierung an einer Holzbearbeitungsbrücke in einer Perspektivansicht schräg von vorn und von der Seite;
Fig. 2
das Eintreibgerät mit dem Kolben in der oberen Kolbenstellung in einem Vertikalschnitt;
Fig. 3
das Eintreibgerät mit dem Mündungswerkzeug abgesetzt auf ein Werkstück in einem Vertikalschnitt;
Fig. 4
das Eintreibgerät mit gerade vollständig in das Werkstück eingetriebenem Nagel in einem Vertikalschnitt;
Fig. 5
das Eintreibgerät mit vom Werkstück abgezogenem Mündungswerkzeug und magnetisch gekoppelten Haupt- und Andruckzylindern in einem Vertikalschnitt;
Fig. 6
das Eintreibgerät zu Beginn der mechanischen Kopplung und Auflösung der magnetischen Kopplung von Hauptzylinder und Andruckzylinder in einem Vertikalschnitt;
Fig. 7a-c
Nagelzentrierung des zweiten Eintreibgeräts in einer teilweise geschnittenen Seitenansicht (Fig. 7a), in einer Draufsicht (Fig. 7b), und in einem Schritt entlang der Linie c-c von Fig. 7a (Fig. 7c).
The invention is explained in more detail below with reference to the attached drawings of exemplary embodiments. The drawings show:
Fig. 1
a driving tool comprising a nail centering on a woodworking bridge in a perspective view obliquely from the front and from the side;
Fig. 2
the driving tool with the piston in the upper piston position in a vertical section;
Fig. 3
the driving tool with the muzzle tool placed on a workpiece in a vertical section;
Fig. 4
the driving tool with the nail completely driven into the workpiece in a vertical section;
Fig. 5
the driving tool with the muzzle tool removed from the workpiece and magnetically coupled master and pressure cylinders in a vertical section;
Fig. 6
the driving tool at the beginning of the mechanical coupling and dissolution of the magnetic coupling of the master cylinder and the pressure cylinder in a vertical section;
7a-c
Nail centering of the second driving tool in a partially sectioned side view ( Fig. 7a ), in a top view ( Fig. 7b ), and in one step along the line cc of Fig. 7a (Fig. 7c ).

In der vorliegenden Anmeldung beziehen sich die Angaben "oben" und "unten" und davon abgeleitete Angaben wie "oberhalb" und "unterhalb" und "vertikal" und "horizontal" auf eine Ausrichtung des Eintreibgerätes mit dem Hauptzylinder über dem Andruckzylinder und der unteren Öffnung des Mündungswerkzeugs am unteren Ende des Eintreibgeräts.In the present application, the information “above” and “below” and information derived therefrom such as “above” and “below” and “vertical” and “horizontal” relate to an alignment of the driving tool with the master cylinder above the pressure cylinder and the lower opening of the muzzle tool at the lower end of the driving tool.

Gemäß Fig. 1 ist ein Eintreibgerät 1 an einer Brücke 2 oberhalb eines Werkstücks 3 angeordnet. Von der Brücke 2 ist nur ein horizontaler Träger gezeigt. Insgesamt ist die Brücke portalförmig, wobei die beiden vertikalen Pfosten auf Schienen beidseitig eines Arbeitstisches in horizontaler Richtung verlagerbar geführt sind.According to Fig. 1 a driving tool 1 is arranged on a bridge 2 above a workpiece 3. Only one horizontal beam from bridge 2 is shown. Overall, the bridge is portal-shaped, with the two vertical posts being guided on rails on both sides of a work table and being displaceable in the horizontal direction.

Gemäß Fig. 1 und 2 umfasst das Eintreibgerät 1 einen Hauptzylinder 4 in einem Gehäuse 5, einen unterhalb des Gehäuses 5 angeordneten Andruckzylinder 6, ein von der Unterseite des Andruckzylinders nach unten vorstehendes Mündungswerkzeug 7 und ein seitlich des Mündungswerkzeugs angeordnetes Magazin 8. Oben hat der Andruckzylinder 6 einen nach außen vorstehenden Flansch 6.1.According to Fig. 1 and 2 The driving tool 1 comprises a master cylinder 4 in a housing 5, a pressure cylinder 6 arranged below the housing 5, a mouth tool 7 protruding from the underside of the pressure cylinder and a magazine 8 arranged on the side of the mouth tool Flange 6.1.

Der Hauptzylinder 4 ist innen kreiszylindrisch oder oval ausgebildet. Oben ist der Hauptzylinder 4 durch einen Deckel 9 verschlossen. In einer zentralen, sechseckigen Vertiefung 10 in der Unterseite des Deckels 9 sitzt der Sechskantkopf einer ersten Schraube 11, deren Gewindeschaft durch eine zentrale Bohrung des Deckels 9 hindurchgeführt ist und oben vom Deckel 9 vorsteht. Die erste Schraube 11 dient der Befestigung an der Brücke 2.The master cylinder 4 is circular cylindrical or oval on the inside. The master cylinder 4 is closed at the top by a cover 9. The hexagon head of a first screw 11 sits in a central, hexagonal recess 10 in the underside of the cover 9, the threaded shaft of which is guided through a central bore in the cover 9 and protrudes from the cover 9 at the top. The first screw 11 is used for attachment to the bridge 2.

Im Hauptzylinder 4 ist vertikal verlagerbar ein Kolben 12 geführt. Der Kolben ist über erste und zweite O-Ringe 13, 14 gegenüber dem Hauptzylinder 4 abgedichtet.A piston 12 is guided vertically displaceably in the master cylinder 4. The piston is sealed off from the master cylinder 4 via first and second O-rings 13, 14.

Von der Unterseite des Kolbens 12 steht eine Kolbenstange 15 nach unten vor. Die Kolbenstange 15 ist mittels einer zweiten Schraube 16 mit dem Kolben 12 verbunden.A piston rod 15 projects downward from the underside of the piston 12. The piston rod 15 is connected to the piston 12 by means of a second screw 16.

Unten weist der Hauptzylinder 4 ein Abdichtelement 17 auf, das als erste Bodenplatte ausgebildet ist. Das Abdichtelement 17 hat im Zentrum ein erstes Durchgangsloch 18 in Form einer Führungsbuchse, durch das die Kolbenstange 15 hindurchgeführt ist, sodass sie unten aus dem Abdichtelement 17 heraussteht.At the bottom, the master cylinder 4 has a sealing element 17, which is designed as a first base plate. The sealing element 17 has a first through hole 18 in the center in the form of a guide bush, through which the piston rod 15 is guided, so that it protrudes from the sealing element 17 at the bottom.

Am Außenumfang des Abdichtelements 17 ist in einer Nut ein dritter O-Ring gehalten, der dieses gegenüber dem Hauptzylinder 4 abdichtet.On the outer circumference of the sealing element 17, a third O-ring is held in a groove, which seals it against the master cylinder 4.

Die Kolbenstange 15 ist durch einen in dem Abdichtelement 17 gehaltenen vierten O-Ring 19 gegenüber dem Abdichtelement 17 abgedichtet.The piston rod 15 is sealed against the sealing element 17 by a fourth O-ring 19 held in the sealing element 17.

Oberhalb des Kolbens 12 ist im Hauptzylinder 4 eine erste Luftkammer 20 und unterhalb des Kolbens 12 ist eine zweite Luftkammer 21 vorhanden. Die erste Luftkammer 20 ist mit einem von außen zugänglichen ersten Lufteinlass 22 und die zweite Kammer mit einem von außen zugänglichen zweiten Lufteinlass 23 verbunden.Above the piston 12 there is a first air chamber 20 in the master cylinder 4 and below the piston 12 there is a second air chamber 21. The first air chamber 20 is connected to an externally accessible first air inlet 22 and the second chamber is connected to an externally accessible second air inlet 23.

Der Andruckzylinder 6 ist außen im Wesentlichen kastenförmig und hat innen einen kreisrunden oder ovalen Querschnitt. Unten weist der Andruckzylinder 6 eine zweite Bodenplatte 24 mit einem zweiten Durchgangsloch 25 auf.The pressure cylinder 6 is essentially box-shaped on the outside and has a circular or oval cross section on the inside. At the bottom, the pressure cylinder 6 has a second base plate 24 with a second through hole 25.

Das Mündungswerkzeug 7 ist an der Unterseite der zweiten Bodenplatte 24 befestigt. Es weist einen Eintreibkanal 26 auf, der oben eine obere Öffnung 27, am unteren Ende des Mündungswerkzeugs 7 eine untere Öffnung 28 und an der Seite eine seitliche Öffnung 29 hat. An die seitliche Öffnung 29 ist das trommelförmige Magazin 8 für Befestigungsmittel mit seiner Ausgabeöffnung angeschlossen.The mouth tool 7 is attached to the underside of the second base plate 24. It has a drive-in channel 26 which has an upper opening 27 at the top, a lower opening 28 at the lower end of the mouth tool 7 and a lateral opening 29 on the side. At the side opening 29, the drum-shaped magazine 8 for fasteners is connected with its discharge opening.

Ein Eintreibstößel 30 ragt mit einem unteren Abschnitt durch das zweite Durchgangsloch 25 und die obere Öffnung 27 in den Eintreibkanal 26 hinein. Der obere Abschnitt des Eintreibstößels 30 ist unten an der Kolbenstange 15 befestigt. Hierfür weist der Eintreibstößel 30 oben ein Außengewinde 31 auf, das in eine Gewindebohrung an der Unterseite der Kolbenstange 15 eingeschraubt ist.A driving tappet 30 projects with a lower section through the second through hole 25 and the upper opening 27 into the driving channel 26. The upper section of the driving plunger 30 is attached to the bottom of the piston rod 15. For this purpose, the driving plunger 30 has an external thread 31 at the top, which is screwed into a threaded bore on the underside of the piston rod 15.

Eine erste Halteeinrichtung 32 weist einen radial von der Kolbenstange 15 vorstehendes, erstes Halteelement 33 auf. Hierbei handelt es sich um einen um die Mittelachse der Kolbenstange umlaufenden, kreisscheibenförmigen Vorsprung. Das erste Halteelement 33 hat im Zentrum eine topfförmige Ausformung 34, in die das untere Ende der Kolbenstange 15 eingesetzt ist. Der Eintreibstößel 30 ist durch ein zentrales Loch der Ausformung hindurchgeführt und in die Kolbenstange 15 eingeschraubt. Ein Bund 35 am Außenumfang des Eintreibstößels 30 liegt an der Unterseite der Ausformung 34 an, sodass das erste Halteelement 33 zwischen Kolbenstange 15 und Eintreibstößel 30 fixiert ist.A first holding device 32 has a first holding element 33 projecting radially from the piston rod 15. This is a circular disk-shaped projection that runs around the central axis of the piston rod. The first holding element 33 has a pot-shaped shape 34 in the center, into which the lower end of the piston rod 15 is inserted. The driving plunger 30 is passed through a central hole in the formation and screwed into the piston rod 15. A collar 35 on the outer circumference of the driving plunger 30 bears against the underside of the formation 34, so that the first holding element 33 is fixed between the piston rod 15 and the driving plunger 30.

Die erste Halteeinrichtung 32 weist ein mit dem Andruckzylinder 6 verbundenes zweites Halteelement 36 auf. Das zweite Halteelement 36 ist ein vom Andruckzylinder 6 radial nach innen vorstehender Vorsprung. Dieser ist als Kreisringscheibe ausgebildet, die vertikal verlagerbar in einer ersten Erweiterung 37 am oberen Ende des Andruckzylinders 6 angeordnet ist.The first holding device 32 has a second holding element 36 connected to the pressure cylinder 6. The second holding element 36 is a projection protruding radially inward from the pressure cylinder 6. This is a circular disc formed, which is arranged vertically displaceable in a first extension 37 at the upper end of the pressure cylinder 6.

Eine erste Anschlageinrichtung 38 weist ein mit der Kolbenstange verbundenes erstes Anschlagelement 39 und ein mit dem Andruckzylinder 6 verbundenes zweites Anschlagelement 40 auf. Das erste Halteelement 33 ist zugleich das erste Anschlagelement 39. Das zweite Anschlagelement 40 ist ein Ring, der von einer Einstelleinrichtung 41 in der Nähe der zweiten Bodenplatte 24 gehalten ist.A first stop device 38 has a first stop element 39 connected to the piston rod and a second stop element 40 connected to the pressure cylinder 6. The first holding element 33 is also the first stop element 39. The second stop element 40 is a ring which is held by an adjusting device 41 in the vicinity of the second base plate 24.

Die Einstelleinrichtung 41 umfasst einen Stellring 42, der ein Innengewinde 43 aufweist, in das das zweite Anschlagelement 40 mit einem Außengewinde 44 eingeschraubt ist. Im Bereich des Außengewindes 44 hat das zweite Anschlagelement 40 einen verringerten Außendurchmesser.The adjusting device 41 comprises an adjusting ring 42, which has an internal thread 43, into which the second stop element 40 is screwed with an external thread 44. In the area of the external thread 44, the second stop element 40 has a reduced external diameter.

Die Unterseite des Stellrings 42 liegt an der Oberseite der zweiten Bodenplatte 24 an. Oben ist der Stellring 42 an einer Schulter 45 des Andruckzylinders 6 geführt. Somit ist der Stellring 42 zwischen Schulter 45 und zweiter Bodenplatte 24 gefangen, sodass er vertikal nicht verlagerbar, sondern nur um die vertikale Achse drehbar ist.The underside of the adjusting ring 42 lies against the upper side of the second base plate 24. At the top, the adjusting ring 42 is guided on a shoulder 45 of the pressure cylinder 6. The adjusting ring 42 is thus caught between the shoulder 45 and the second base plate 24, so that it cannot be displaced vertically, but rather can only be rotated about the vertical axis.

Am Außenumfang hat der Stellring 42 mehrere erste Sackbohrungen 46, in die durch einen Schlitz 47 des Andruckzylinders 6 von außen ein Stift zum Verdrehen des Stellrings 42 einsetzbar ist (Fig. 1). Das zweite Anschlagelement 40 weist an der Unterseite mehrere vertikale Gewindebohrungen 48 auf, in die Stehbolzen 49 eingeschraubt sind, die in zweiten Bohrungen 24.1 der zweiten Bodenplatte 24 axial verschieblich geführt sind. Die zweiten Bohrungen 24.1 der zweiten Bodenplatte 24 und die Stehbolzen 49 bilden eine Linearführung 50.On the outer circumference, the adjusting ring 42 has a plurality of first blind bores 46, into which a pin for rotating the adjusting ring 42 can be inserted from the outside through a slot 47 in the pressure cylinder 6 ( Fig. 1 ). The second stop element 40 has a plurality of vertical threaded bores 48 on the underside, into which stud bolts 49 are screwed, which are guided axially displaceably in second bores 24.1 of the second base plate 24. The second bores 24.1 of the second base plate 24 and the stud bolts 49 form a linear guide 50.

Durch Drehen des Stellrings 42 ist das zweite Anschlagelement 40 in vertikaler Richtung verlagerbar, da es von den Stehbolzen 49 an einem Mitdrehen mit dem Stellring 42 gehindert wird.By turning the adjusting ring 42, the second stop element 40 can be displaced in the vertical direction, since the stud bolts 49 prevent it from rotating with the adjusting ring 42.

Ferner ist eine zweite Halteeinrichtung 51 vorhanden, die ein mit der Kolbenstange 15 verbundenes drittes Haltelement 52 und ein mit dem Andruckzylinder 6 verbundenes viertes Haltelement 53 aufweist. Das vierte Haltelement 53 ist eine Nagelzentrierung 54 am unteren Ende des Mündungswerkzeugs 7.Furthermore, there is a second holding device 51, which has a third holding element 52 connected to the piston rod 15 and a fourth holding element 53 connected to the pressure cylinder 6. The fourth holding element 53 is a nail centering 54 at the lower end of the mouth tool 7.

Die Nagelzentrierung 54 weist ein kreisscheibenförmiges Zentriergehäuse 55 mit einem vertikalen Zentrierkanal 56 auf, der auf den Eintreibkanal 26 ausgerichtet ist (Fig. 7). In dem Zentriergehäuse 55 sind in zwei horizontalen Ebenen übereinander in jeweils drei radialen Kugelführungskanälen 57 um eine Zentrieröffnung 58 herum jeweils zwei konzentrische Kränze 59, 60, 61, 62 aus Kugeln 63 angeordnet. Die Kugeln 63 der beiden übereinander angeordneten inneren Kränze 59, 61 stehen teilweise in den Zentrierkanal 56 hinein, wobei benachbarte Kugeln 63 sich aneinander abstützen und eine Zentrieröffnung begrenzen. Benachbarte Kugeln 63 der äußeren Kränze 60, 62 und der inneren Kränze 59, 61 liegen an ihrem Äquator aneinander an.The nail centering 54 has a circular disk-shaped centering housing 55 with a vertical centering channel 56, which is aligned with the drive-in channel 26 ( Fig. 7 ). In the centering housing 55, two concentric rings 59, 60, 61, 62 of balls 63 are arranged in two radial planes one above the other in three radial ball guide channels 57 around a centering opening 58. The balls 63 of the two inner rims 59, 61 arranged one above the other partially protrude into the centering channel 56, adjacent balls 63 being supported on one another and delimiting a centering opening. Adjacent balls 63 of the outer rings 60, 62 and the inner rings 59, 61 lie against one another at their equator.

Am Außenumfang hat das Zentriergehäuse 55 jeweils in der Äquatorebene der oberen Kränze 59, 60 und der unteren Kränze 61, 62 eine umlaufende Nut 64, 65, die bis in die Kugelführungskanäle 57 im Zentriergehäuse 55 hineinreicht, in denen die Kugeln 63 angeordnet sind. In jeder Nut 64, 65 sitzt ein Sprengring 66, 67, der unter elastischer Vorspannung gegen die Kugeln 63 des äußeren Kranzes 60, 62 drückt, die wiederum die Kugeln 63 der inneren Kränze 59, 61 bis zur Anlage aneinander in den Zentrierkanal 56 hineindrücken, sodass zwischen den Kugeln 63 der inneren Kränze 59, 61 die Zentrieröffnung 58 verbleibt. Zusätzlich sind O-Ringe 68, 69 zwischen den Kugeln 63 der inneren Kränze 59, 61 und der äußeren Kränze 60, 62 angeordnet, um unterschiedliche Durchmesser von genormten Kugeln 63 und Sprengringen 66, 67 auszugleichen, sodass die Kugeln 63 der inneren Kränze 59, 61 jeweils aneinander anliegen.On the outer circumference, the centering housing 55 has a circumferential groove 64, 65 in the equatorial plane of the upper rings 59, 60 and the lower rings 61, 62, which extends into the ball guide channels 57 in the centering housing 55, in which the balls 63 are arranged. In each groove 64, 65 there is a snap ring 66, 67, which presses against the balls 63 of the outer ring 60, 62 under elastic pretension, which in turn press the balls 63 of the inner rings 59, 61 into contact with one another in the centering channel 56, so that the centering opening 58 remains between the balls 63 of the inner rings 59, 61. In addition, O-rings 68, 69 are arranged between the balls 63 of the inner rings 59, 61 and the outer rings 60, 62 by different diameters of standardized balls 63 and snap rings Compensate 66, 67 so that the balls 63 of the inner rings 59, 61 each abut each other.

Das vierte Halteelement 52 besteht aus umlaufenden, übereinander angeordneten Nuten 72, 73 in einem unteren Abschnitt des Eintreibstößels. Im Vertikalschnitt sind die Nuten 72, 73 leicht gerundet, entsprechend der Außenkontur der Kugeln 63 der Nagelzentrierung 54. Der Abstand der beiden Nuten 72, 73 entspricht dem Abstand der übereinander angeordneten Kränze 59, 60, 61, 62 voneinander.The fourth holding element 52 consists of circumferential, superimposed grooves 72, 73 in a lower section of the driving plunger. In vertical section, the grooves 72, 73 are slightly rounded, corresponding to the outer contour of the balls 63 of the nail centering 54. The distance between the two grooves 72, 73 corresponds to the distance between the rims 59, 60, 61, 62 arranged one above the other.

Ferner ist eine dritte Halteeinrichtung 74 vorhanden, die ein fünftes Halteelement 75 am Hauptzylinder 4 und ein sechstes Halteelement 76 am Andruckzylinder 6 aufweist. Die dritte Halteeinrichtung 74 umfasst eine Magnetkupplung 77, die ein mit dem Hauptzylinder 4 verbundenes erstes Magnetkupplungselement 78 und ein mit dem Andruckzylinder 6 verbundenes zweites Magnetkupplungselement 79 aufweist. Das erste Magnetkupplungselement 78 weist kreisscheibenförmige Permanentmagnete 80 auf, die mittels vierter Schrauben 81 an den unteren Enden von ersten Stangen 82 befestigt sind, die in vertikalen ersten Bohrungen 83 des Gehäuses 5 geführt sind.Furthermore, a third holding device 74 is provided, which has a fifth holding element 75 on the master cylinder 4 and a sixth holding element 76 on the pressure cylinder 6. The third holding device 74 comprises a magnetic coupling 77, which has a first magnetic coupling element 78 connected to the master cylinder 4 and a second magnetic coupling element 79 connected to the pressure cylinder 6. The first magnetic coupling element 78 has circular-disc-shaped permanent magnets 80 which are fastened by means of fourth screws 81 to the lower ends of first rods 82 which are guided in vertical first bores 83 of the housing 5.

An den oberen Enden der Stangen 82 sind mittels fünfter Schrauben 84 erste Scheiben 85 befestigt, die radial bezüglich der Stangen 82 nach außen vorstehen. Die ersten Scheiben 85 sind in zweiten Erweiterungen 86 der ersten Bohrungen 83 angeordnet und begrenzen durch Anlage an einem Absatz am unteren Ende der zweiten Erweiterungen 86 die Verlagerung der ersten Stangen 82 nach unten. Die Verlagerung der ersten Stangen 82 nach oben ist durch Anlage der radial bezüglich der ersten Stangen 82 vorstehenden Permanentmagnete 80 an der Unterseite des Gehäuses 5 begrenzt. Das vierte Magnetkupplungselement 79 ist als Kreisringscheibe aus einem ferromagnetischen Material ausgebildet, die am oberen Ende des Andruckzylinders 6 befestigt ist.At the upper ends of the rods 82, first disks 85 are fastened by means of fifth screws 84, which protrude radially outwards with respect to the rods 82. The first disks 85 are arranged in second extensions 86 of the first bores 83 and limit the downward displacement of the first rods 82 by abutment on a shoulder at the lower end of the second extensions 86. The upward displacement of the first rods 82 is limited by the permanent magnets 80 projecting radially with respect to the first rods 82 against the underside of the housing 5. The fourth magnetic coupling element 79 is designed as an annular disk made of a ferromagnetic material, which is attached to the upper end of the pressure cylinder 6.

Die dritte Halteeinrichtung 74 umfasst eine zweite Anschlageinrichtung 87, die ein drittes Anschlagelement 88 am Hauptzylinder 4 und ein viertes Anschlagelement 89 am Andruckzylinder 6 aufweist. Das vierte Anschlagelement 88 ist ein radial nach innen vorstehender Teil des zweiten Magnetkupplungselements 79 und das dritte Anschlagelement 89 ist die Unterseite des Abdichtelements 17.The third holding device 74 comprises a second stop device 87, which has a third stop element 88 on the master cylinder 4 and a fourth stop element 89 on the pressure cylinder 6. The fourth stop element 88 is a radially inwardly projecting part of the second magnetic coupling element 79 and the third stop element 89 is the underside of the sealing element 17.

Das zweite Magnetkupplungselement 79 begrenzt durch Anlage an der Unterseite des Abdichtelements 17 die Verlagerung des Andruckzylinders 6 nach oben. Ferner deckt es die erste Erweiterung 37 des Andruckzylinders 6 oben ab und begrenzt die Verlagerung des zweiten Halteelements 36 nach oben. Nach unten ist die Verlagerung des zweiten Halteelements 36 durch den Boden der ersten Erweiterung 37 begrenzt.The second magnetic coupling element 79 limits the upward displacement of the pressure cylinder 6 by abutment on the underside of the sealing element 17. Furthermore, it covers the first extension 37 of the pressure cylinder 6 at the top and limits the displacement of the second holding element 36 upwards. The downward movement of the second holding element 36 is limited by the bottom of the first extension 37.

Ferner ist eine Aushebeeinrichtung 90 mit vertikal ausgerichteten Stiften 91 vorhanden. Die Stifte 91 stehen von der Oberseite des zweiten Halteelements 36 nach oben vor.There is also a lifting device 90 with vertically aligned pins 91. The pins 91 protrude upward from the top of the second holding member 36.

Die Stifte 91 greifen in Löcher 92 des zweiten Magnetkupplungselements 79 ein. Wenn sich das zweite Halteelement 36 in der unteren Lage befindet, stehen die Stifte 91 nicht über die Oberseite des zweiten Magnetkupplungselements 79 hervor (Fig. 3). Durch Verlagern des zweiten Halteelements 36 nach oben werden die Stifte 91 oben aus den Löchern 92 herausgeschoben (Fig. 2).The pins 91 engage in holes 92 in the second magnetic coupling element 79. When the second holding element 36 is in the lower position, the pins 91 do not protrude above the top of the second magnetic coupling element 79 ( Fig. 3 ). By moving the second holding element 36 upwards, the pins 91 are pushed out of the holes 92 at the top ( Fig. 2 ).

Eine Halterung 93 des Magazins 8 ist am Andruckzylinder 6 befestigt.A holder 93 of the magazine 8 is attached to the pressure cylinder 6.

In eine Erweiterung 94 des Zentrierkanals 56 der Nagelzentrierung 54 ist das untere Ende des Mündungswerkzeugs 7 eingesetzt und darin mittels einer in eine Gewindebohrung 95 eingeschraubte Klemmschraube festgeklemmt.The lower end of the mouth tool 7 is inserted into an extension 94 of the centering channel 56 of the nail centering 54 and clamped therein by means of a clamping screw screwed into a threaded bore 95.

Der Flansch 6.1 des Andruckzylinders 6 ist mittels sechster Schrauben 96 an zweiten Stangen 97 befestigt, die in vertikalen dritten Bohrungen 98 im Gehäuse 5 geführt sind.The flange 6.1 of the pressure cylinder 6 is fastened by means of sixth screws 96 to second rods 97 which are guided in vertical third bores 98 in the housing 5.

Fig. 1 und 2 zeigen das erste Eintreibgerät 1 in einer Ausgangsstellung, in der das Mündungswerkzeug 7 mit der Nagelzentrierung 54 nicht auf dem Werkstück 3 aufsitzt. Der Kolben 12 ist durch in die zweite Luftkammer 20 eingespeiste Druckluft in der oberen Kolbenstellung gehalten, in der er am Deckel 9 anliegt. Das erste Halteelement 33 ist durch die Kolbenstange 15 maximal angehoben, sodass das zweite Halteelement 36 an der Unterseite des sechsten Halteelements 76 anliegt. Das erste Magnetkupplungselement 78 ist durch die Stifte 91 von dem zweite Magnetkupplungselement 79 abgedrückt. Fig. 1 and 2 show the first driving tool 1 in a starting position in which the mouth tool 7 with the nail centering 54 is not seated on the workpiece 3. The piston 12 is held in the upper piston position by compressed air fed into the second air chamber 20, in which it rests on the cover 9. The first holding element 33 is maximally raised by the piston rod 15, so that the second holding element 36 bears against the underside of the sixth holding element 76. The first magnetic coupling element 78 is pushed away from the second magnetic coupling element 79 by the pins 91.

Gemäß Fig. 3 wird durch Einspeisen von Druckluft in die erste Luftkammer 20 und Entlüften der zweiten Luftkammer 21 der Kolben 12 und damit das erste Halteelement 33 nach unten verlagert. Mit dem ersten Halteelement 33 wandert das zweite Halteelement 36 und damit der Andruckzylinder 6 nach unten, bis das Mündungswerkzeug 7 mit der Nagelzentrierung 54 auf das Werkstück 3 aufsitzt. Hierdurch ist eine definierte Ausgangslage für das Eintreiben eines Nagels 99 oder eines anderen Befestigungsmittels in das Werkstück 3 gegeben.According to Fig. 3 is displaced by feeding compressed air into the first air chamber 20 and venting the second air chamber 21, the piston 12 and thus the first holding element 33 down. With the first holding element 33, the second holding element 36 and thus the pressure cylinder 6 move downward until the mouth tool 7 with the nail centering 54 is seated on the workpiece 3. This provides a defined starting position for driving a nail 99 or other fastening means into the workpiece 3.

Gemäß Fig. 4 wird danach weitere Druckluft in die erste Luftkammer 20 eingeleitet und ein aus dem Magazin 8 in den Eintreibkanal 26 eingespeister Nagel 99 in das Werkstück 3 eingetrieben, bis das erste Anschlagelement 39 an dem zweiten Anschlagelement 40 anliegt. Dann ist der Nagel 99 in einer definierten Eindringtiefe in das Werkstück 3 eingetrieben. Die Eindringtiefe wird bestimmt durch die vertikale Lage des zweiten Anschlagelements 40, die durch Verdrehen des Stellrings 42 von außen einstellbar ist.According to Fig. 4 Further compressed air is then introduced into the first air chamber 20 and a nail 99 fed into the drive channel 26 from the magazine 8 is driven into the workpiece 3 until the first stop element 39 abuts the second stop element 40. Then the nail 99 is driven into the workpiece 3 at a defined depth of penetration. The penetration depth is determined by the vertical position of the second stop element 40, which can be adjusted from the outside by turning the adjusting ring 42.

Beim Austreten eines Nagels 99 aus dem Eintreibkanal 26 wird der Nagelschaft von den Kränzen 59, 60, 61, 62 aus Kugeln 63 zentriert, sodass er vertikal in das Werkstück 3 eindringt. Fig. 4 zeigt das Eintreibwerkzeug mit in der vorgegebenen Eindringtiefe eingetriebenen Nagel 99. Hierbei greift auch der untere Teil des Eintreibstößels 30 in den Zentrierkanal 56 ein. Die Kugeln 63 der beiden inneren Kränze 59, 61 greifen in die beiden Nuten 72, 73 ein und werden von den Sprengringen 66, 67 darin festgehalten.When a nail 99 emerges from the drive-in channel 26, the nail shaft is centered by the rings 59, 60, 61, 62 made of balls 63, so that it penetrates vertically into the workpiece 3. Fig. 4 shows the driving tool with the nail 99 driven in at the predetermined penetration depth. The lower part of the driving plunger 30 also engages in the centering channel 56. The balls 63 of the two inner rings 59, 61 engage in the two grooves 72, 73 and are held in place by the snap rings 66, 67.

Gemäß Fig. 5 hat dies zur Folge, dass beim darauffolgenden Verlagern des Kolbens 12 nach oben über die Nagelzentrierung 54 das Mündungswerkzeug 7 und der Andruckzylinder 6 mit nach oben angehoben werden, bis die erste Magnetkupplung 74 einkuppelt.According to Fig. 5 this has the consequence that when the piston 12 is subsequently displaced upwards via the nail centering 54, the muzzle tool 7 and the pressure cylinder 6 are also lifted upwards until the first magnetic coupling 74 engages.

Durch Anlage des sechsten Halteelements 76 an der ersten Bodenplatte 17 wird der Andruckzylinder 6 an einem weiteren Verlagern nach oben gehindert und der Eintreibstößel 30 aus der Nagelzentrierung 54 herausgezogen. Wenn das erste Haltelement 33 auf das zweite Halteelement 36 trifft, lösen die Stifte 91 die erste Magnetkupplung 77 auf. Der Andruckzylinder 6 wird durch Anlage des ersten Haltelements 33 am zweiten Haltelement 36 und des zweiten Haltelements 36 am sechsten Haltelement 76 festgehalten. Dies ist in Fig. 6 gezeigt.By contacting the sixth holding element 76 on the first base plate 17, the pressure cylinder 6 is prevented from moving further upward and the driving plunger 30 is pulled out of the nail centering 54. When the first holding element 33 meets the second holding element 36, the pins 91 release the first magnetic coupling 77. The pressure cylinder 6 is held by the first holding element 33 against the second holding element 36 and the second holding element 36 against the sixth holding element 76. This is in Fig. 6 shown.

Nach Einspeisen eines weiteren Nagels 99 aus dem Magazin 8 in den Eintreibkanal 26 ist das Eintreibgerät 1 für einen weiteren Eintreibvorgang bereit. Dies zeigt Fig. 2.After another nail 99 has been fed from the magazine 8 into the drive-in channel 26, the drive-in device 1 is ready for a further drive-in process. this shows Fig. 2 ,

Claims (15)

  1. A driving tool for driving fastening means into workpieces comprising
    - a drive device (4, 12) in a housing (5),
    - an outlet tool (7) protruding from the lower end of the housing (5) with a driving channel (26),
    - a driving tappet (30) that projects into the driving channel (26) and is connected at the top to the drive device (4, 12),
    - a magazine (8) for fastening means (99) that is attached to the driving channel (26) in order to supply fastening means (99) to the driving channel (26), and
    - a nail centering (54) at the bottom on the outlet tool (7) that has a centering opening (58) that is limited by guide elements movable in the radial direction that are pretensioned toward the centering opening (58) by at least one spring device,
    characterized in that
    - the nail centering (54) comprises a centering housing (55) in which at least one circle (59 to 62) of balls (63) is arranged, between which the centering opening (58) is defined, and
    - the spring device is an elastic ring (66, 67) that under pretensioning abuts the balls (63) on the outside.
  2. The driving tool according to claim 1, in which the ring is an elastic snap ring (66, 67).
  3. The driving tool according to claim 1 or 2, in which concentrically arranged circles (59 to 62) of balls (63) are arranged in the centering housing (55) in at least one plane, wherein the centering opening (58) is defined by the balls (63) of an inner circle (59, 61), the balls (63) of an outer circle (60, 62) abut the balls (63) of an inner circle (59, 61) and an elastic ring (66, 67) under pretensioning abuts the balls (63) of an outer circle (60, 62).
  4. The driving tool according to one of claims 1 to 3, in which the balls (63) of the circle (59, 61) bordering the centering opening (58) abut each other.
  5. The driving tool according to one of claims 1 to 4, in which balls (63) from concentrically arranged circles (59 to 62) abut each other on their equators.
  6. The driving tool according to one of claims 1 to 5, in which the ring (66, 67) abuts on the outside the equator of the balls (63) of a circle (60, 62).
  7. The driving tool according to one of claims 1 to 6, in which the nail centering (54) has multiple circles (59 to 62) of balls (63) arranged over each other that each border a centering opening (58).
  8. The driving tool according to one of claims 1 to 7, in which the nail centering (54) has two concentrically arranged circles (59, 60) of balls (63).
  9. The driving tool according to one of claims 1 to 8, in which the nail centering (54) has at least one arrangement of exactly two circles (59, 61) of balls (63) arranged over each other and/or at least one arrangement of exactly two concentric circles (59 to 62) of balls (63).
  10. The driving tool according to one of claims 1 to 9, in which the centering housing (55) is circular disk-shaped, has a central centering channel (56) and in at least one plane multiple radial ball guiding channels (57) that each start from the outer circumference of the centering housing (55) and terminate in the centering channel (56), balls (63) are arranged in the ball guiding channels (57), the centering housing (55) has a circumferential groove (64, 65) on the outer circumference that cuts the outer ends of multiple ball guiding channels (57), and an elastic ring (66, 67) that under pretensioning abuts multiple balls (63) on the outside is inserted into the groove (64, 65), whereby balls (63) are partially pushed into the centering channel (56) between which the centering opening (58) is defined.
  11. The driving tool according to claim 10, in which the centering housing (55) has exactly three radial ball guiding channels (57) in each plane in which balls (63) are arranged.
  12. The driving tool according to one of claims 1 to 11, in which the centering housing (55) has at least one radially extended threaded bore (97) that is extended starting from the outer circumference to an extension (96) on the upper end of the centering channel (56), the lower end of the outlet tool (7) is inserted into the extension (96), and a clamping screw (98) is inserted into the threaded bore (97) by means of which the centering housing (55) is firmly clamped on the outlet tool (7).
  13. The driving tool according to one of claims 3 to 10, in which elastic O-rings (68, 69) are arranged between the balls (63) of an inner circle (59, 61) and an outer circle (60, 62).
  14. The driving tool according to one of claims 1 to 13 that is driven by means of compressed air, gas explosion or electrical current.
  15. The driving tool according to one of claims 1 to 14 that is a driving tool (1) that can be handled with only one hand during use or a displaceable driving tool (1) held on a displacement device or a stationarily arranged driving tool (1).
EP18169277.3A 2017-05-19 2018-04-25 Driving tool for driving fastening means into workpieces Active EP3403769B1 (en)

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DE202017103050.4U DE202017103050U1 (en) 2017-05-19 2017-05-19 Drive-in device for driving fasteners into workpieces

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EP3403769A3 EP3403769A3 (en) 2018-12-05
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US (1) US20180333889A1 (en)
EP (1) EP3403769B1 (en)
CN (1) CN108927864B (en)
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DE (1) DE202017103050U1 (en)
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CN112060015A (en) * 2020-09-09 2020-12-11 南京腾亚精工科技股份有限公司 Axial ail shooter firing mechanism

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AU2018203397A1 (en) 2018-12-06
RU2695789C1 (en) 2019-07-26
CN108927864A (en) 2018-12-04
AU2018203397B2 (en) 2019-12-12
US20180333889A1 (en) 2018-11-22
TWI717601B (en) 2021-02-01
EP3403769A2 (en) 2018-11-21
TW201900354A (en) 2019-01-01
CN108927864B (en) 2021-06-04
EP3403769A3 (en) 2018-12-05
DE202017103050U1 (en) 2018-08-22

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