EP0830920B1 - Fastening tool and a returning spring therefor - Google Patents

Fastening tool and a returning spring therefor Download PDF

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Publication number
EP0830920B1
EP0830920B1 EP97115895A EP97115895A EP0830920B1 EP 0830920 B1 EP0830920 B1 EP 0830920B1 EP 97115895 A EP97115895 A EP 97115895A EP 97115895 A EP97115895 A EP 97115895A EP 0830920 B1 EP0830920 B1 EP 0830920B1
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EP
European Patent Office
Prior art keywords
driver according
stud driver
stiffening elements
spring
piston
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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.)
Expired - Lifetime
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EP97115895A
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German (de)
French (fr)
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EP0830920A1 (en
Inventor
Gerd Dr. Kellner
Axel Ziegler
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Adolf Wuerth GmbH and Co KG
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Adolf Wuerth GmbH and Co KG
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Priority to DK97115895T priority Critical patent/DK0830920T3/en
Publication of EP0830920A1 publication Critical patent/EP0830920A1/en
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    • 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
    • B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil

Definitions

  • the invention is based on a bolt-setting or pushing device, with the help of which a fastener, usually in the form of a nail or bolt can be.
  • the bolt pusher contains a propellant piston that passes through the propellant gases after ignition of a cartridge and driven by its Feed movement drives the bolt.
  • a bolt-driving tool of this type is already known (US Pat. No. 3,331,546), in which this purpose, a variety of disc springs around a piston rod Driving piston is arranged.
  • the plate springs preferably consist of Polyurethane and are alternately arranged upside down, so that one Disc spring package from disc springs that are not connected.
  • the return spring can be integrally formed as a cylindrical sleeve, so that the restoring force results from compression of the restoring spring. she can also from several individual parts arranged between rigid elements be constructed.
  • a return spring is present, the is designed as a cylindrical sleeve.
  • the restoring force is also here Compression of the return spring causes.
  • the invention has for its object a bolt-driving tool to create, in which the driving piston after setting the fastener is reset and the device has a long service life without changing the spring.
  • the invention is also based on the object of a spring to create for such a bolt gun.
  • the invention proposes a bolt-setting tool with the features mentioned in claim 1 and a spring for this with the features mentioned in claim 15 in front. Developments of the invention are the subject of dependent claims.
  • the Driving piston a piston rod with a reduced diameter has at least part of its length from the sleeve-like spring is surrounded.
  • the spring proposed by the invention is used during assembly of the device simply placed over the piston rod and the device is then assembled. You no longer have to pay attention to it be that the individual disc springs always alternate be used in the reverse position.
  • the spring between you the movement of the driving piston non-participating part of the device and the driving piston.
  • the spring therefore acts directly on the driving piston.
  • the spring cooperates with the driving piston Braking element attacks for this. This means, that towards the end of the setting movement of the driving piston, if so the spring is tightened more, this movement is partly converted into a braking movement by the braking element.
  • the spring formed in this way can, for example be a tension spring. However, it is particularly favorable if the Spring is designed as a compression spring so that when you set of the fastener is stressed.
  • the spring has stiffening elements distributed over its length, that don't deform themselves.
  • the stiffening elements can in particular from a harder and / or other Material. This causes the spring to deform on small areas between two reinforcement elements concentrated so that the deviation of the spring in the Compression case kept small by the approximately cylindrical shape can be.
  • the Stiffening elements during the movement of the driving piston be guided by this and / or by the piston raceway. So it can not happen that the elastomeric material existing spring during the very fast insertion movement is deformed on one side or convoluted so that it hinders the insertion movement of the piston or else is destroyed by this.
  • the stiffening elements are metallic washers, their outer diameter corresponds approximately to the inside diameter of the piston raceway, so that they are guided on their outside. Furthermore can their inside diameter is about the outside diameter of the piston rod correspond so that they are also guided on the inside be prevented from jamming.
  • the spring with the Reinforcing elements is vulcanized together. This creates a one-piece spring that can be manufactured as a single element, which has all the desired properties.
  • the spring has a wall thickness has, which is at most half as large, preferably is at most a third of the difference between the radius of the reinforcing elements and the radius of the inner opening of the reinforcement elements. This will ensure that the spring is a relative in the compressed state has small axial length, which is essentially only by the thickness of all reinforcing elements is determined, so that lie close to each other on a block.
  • the sleeve-like spring is advantageously close to the Inner opening of the reinforcement elements and therefore nearby arranged the piston rod. Their deformation therefore takes place in primarily radially outwards.
  • the spring In the undeformed state, the spring can preferably be a cylindrical one Have shape.
  • the reinforcing elements can in particular be arranged equidistantly , which among other things means that there is no front and rear ends of the spring there.
  • the orientation the spring when assembling the device is therefore not critical.
  • the reinforcing elements can advantageously be arranged in this way be that their mutual distance is about half their size Corresponds to diameter.
  • Fig. 1 shows a simplified longitudinal section through a Bolt thruster according to the invention.
  • the bolt pusher according to the invention includes a rear housing 1 in which including the facilities for feeding and igniting one Propellant charge are included. These details are not shown.
  • the piston sleeve 2 is accommodated in the housing 1, which has a cylindrical space 3 on its inside forms.
  • a driving piston 4 housed, with the help of seals, not shown is sealed off from room 3.
  • the driving piston 4 can to be moved in the cylinder space 3. This shifting movement is indicated by a on the right in Fig. 1 of the Driving piston 4 ignited propellant charge.
  • a ring element 5 made of elastomer material is accommodated, that abuts an end wall 6 of the head sleeve 11 and one Brake buffer forms.
  • On the end wall 6 facing away Side of the brake buffer 5 is located inside the sleeve 2 sliding brake cone 7.
  • the brake cone 7 has one widening in a funnel shape in the direction of the driving piston 4 Inner opening 8.
  • a piston rod 9 attached in its first to itself the driving piston 4 immediately adjacent half first diameter and in the following, for free end towards a second, again has reduced diameter.
  • the return spring 10 is approximately sleeve-shaped and extends between the piston rod 9 having end face of the driving piston 4 and the corresponding opposite end face of the braking element 7.
  • an outer head sleeve 11 placed a cylindrical interior 12 for receiving of the actual fastener.
  • the floor of the cylindrical interior 12 has an opening, through which the front end of the piston rod 9 projects.
  • the free end face 14 annular is formed and slightly opposite the front edge 15 of the Head sleeve 11 protrudes.
  • the mounting sleeve 13 goes on their Device facing side in a radial flange 16 on the end face of which an elastomeric buffer 17 is attached.
  • the return spring 10 has the shape of a cylindrical, elongated sleeve 18 made of elastomer material through corresponding openings of a variety of reinforcing elements 19 is vulcanized through.
  • the reinforcement elements 19 are arranged at the same distance along the elastomer sleeve 18. They lie with their outer edges at a short distance in front of the inner wall of the cylindrical interior 3.
  • the Reinforcing elements 19 have a central opening coaxially 20 in the form of a circular hole, with which they on the Piston rod 19 are lined up. The inside diameter of this Hole 20 corresponds approximately to the outer diameter of the thicker Area of the piston rod 9.
  • the wall thickness of the elastomer sleeve 18 corresponds approximately to one A quarter to a third of the distance between the outer circumference the thicker part of the piston rod 9 and the inner diameter of the cylinder space 3 or the outer diameter of the driving piston 4.
  • the arrangement of the elastomer sleeve 18 is chosen so that this near the central central opening 20 of the Reinforcing elements 19 is arranged.
  • Fig. 1 shows the device in the starting position in which the Driving piston 4 to almost in front of the rear end of the cylinder space 3 is pushed. In this position, a fastener can inserted into the interior 12 of the head sleeve 11 become. The return spring 10 is relaxed. Now becomes Put a fastener a LPG cartridge ignited, the driving piston 4 moves at high speed from the starting position shown in the Setting position, i.e. 1 to the left. This leads to the return spring is compressed.
  • the deforms Sleeve 18 only in the area between the reinforcing elements 19, in which the material primarily deforms outwards becomes.
  • the spring 10 is shortened like an accordion, whereby the deformation of the elastomer sleeve 18 evenly over the Length of the spring is distributed.
  • Fig. 2 shows an enlarged plan view of a reinforcing element 19.
  • the reinforcing element 19 has the shape of a metallic circular washer 21, for example made of aluminium. Concentric to the central opening 20 is one Circle of smaller circular openings 22 present. This Openings 22 correspond in their arrangement and their diameter the arrangement and the wall thickness of the elastomer sleeve 18.
  • the elastomer sleeve 18 is passed through these holes 22 vulcanized, connecting with the metallic Discs 21 takes place. This creates one as a single Component trained spring due to the reinforcing elements secured in the arrangement of FIG. 1 against buckling is.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Springs (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Sawing (AREA)
  • Wire Processing (AREA)

Abstract

The tool comprises a reciprocating drive piston (4) actuated by a propulsive charge. A compression spring (10) is made of an elastically deformable material for returning the piston to its original position after the bolt fitting process. The piston rod (9) has a reduced diameter which over at least a part of its length is enclosed by the sleeve-form return spring which is located between an element (7) not contributing to the movement of the piston, and the piston itself.

Description

Die Erfindung geht aus von einem Bolzensetz- bzw. -schubgerät, mit dessen Hilfe ein Befestigungsmittel, in der Regel in Form eines Nagels oder Bolzens, gesetzt werden kann. Das Bolzenschubgerät enthält einen Treibkolben, der durch die Treibladungsgase nach Zündung einer Kartusche angetrieben wird und durch seine Vorschubbewegung den Bolzen eintreibt.The invention is based on a bolt-setting or pushing device, with the help of which a fastener, usually in the form of a nail or bolt can be. The bolt pusher contains a propellant piston that passes through the propellant gases after ignition of a cartridge and driven by its Feed movement drives the bolt.

Insbesondere für einen automatischen Betrieb eines solchen Bolzenschubgerätes, bei dem die zu setzenden Befestigungselemente mit Hilfe eines an dem Gerät angebrachten Magazins zugeführt werden, ist es wünschenswert, den Treibkolben durch eine Automatik in seine Ausgangsposition zurückkehren zu lassen.In particular for the automatic operation of such a bolt pushing device, in which the fasteners to be set with the help of a on the device attached magazine are fed, it is desirable to the driving piston to return to its starting position by an automatic system.

Es ist bereits ein Bolzensetzgerät dieser Art bekannt (US-PS 3 331 546), bei dem zu diesem Zweck eine Vielzahl von Tellerfedern um eine Kolbenstange eines Treibkolbens angeordnet ist. Die Tellerfedern bestehen vorzugsweise aus Polyurethan und sind abwechselnd umgekehrt angeordnet, so dass sich ein Tellerfederpaket aus nicht miteinander verbundenen Tellerfedern ergibt.A bolt-driving tool of this type is already known (US Pat. No. 3,331,546), in which this purpose, a variety of disc springs around a piston rod Driving piston is arranged. The plate springs preferably consist of Polyurethane and are alternately arranged upside down, so that one Disc spring package from disc springs that are not connected.

Weiterhin bekannt ist ein Bolzensetzgerät mit einer Rückstellfeder (EP-A1- 732178). Die Rückstellfeder kann einstückig als zylindrische Hülse ausgebildet sein, so dass die Rückstellkraft sich durch Komprimierung der Rückstellfeder ergibt. Sie kann ebenfalls aus mehreren zwischen starren Elementen angeordneten einzelnen Teilen aufgebaut sein.Also known is a bolt-actuating device with a return spring (EP-A1- 732178). The return spring can be integrally formed as a cylindrical sleeve, so that the restoring force results from compression of the restoring spring. she can also from several individual parts arranged between rigid elements be constructed.

Bei einem weiteren bekannten Repetiergerät ist eine Rückstellfeder vorhanden, die als zylindrische Hülse ausgebildet ist. Auch hier wird die Rückstellkraft durch Komprimierung der Rückstellfeder bewirkt. (DE -A1-1939801). In another known repeating device, a return spring is present, the is designed as a cylindrical sleeve. The restoring force is also here Compression of the return spring causes. (DE-A1-1939801).

Der Erfindung liegt die Aufgabe zugrunde, ein Bolzensetzgerät zu schaffen, bei dem der Treibkolben nach dem Setzen des Befestigungselementes zurückgestellt wird und bei dem das Gerät eine lange Lebensdauer ohne Auswechseln der Feder aufweist. Der Erfindung liegt ebenfalls die Aufgabe zugrunde, eine Feder für ein derartiges Bolzensetzgerät zu schaffen.The invention has for its object a bolt-driving tool to create, in which the driving piston after setting the fastener is reset and the device has a long service life without changing the spring. The invention is also based on the object of a spring to create for such a bolt gun.

Zur Lösung dieser Aufgabe schlägt die Erfindung ein Bolzensetzgerät mit den im Anspruch 1 genannten Merkmalen sowie eine Feder hierzu mit den im Anspruch 15 genannten Merkmalen vor. Weiterbildungen der Erfindung sind Gegenstand von Unteransprüchen.To achieve this object, the invention proposes a bolt-setting tool with the features mentioned in claim 1 and a spring for this with the features mentioned in claim 15 in front. Developments of the invention are the subject of dependent claims.

Die Anordnung einer Feder, die beim Setzen des Befestigungselementes gegen ihre Federkraft gespannt wird, macht es möglich, bei einfachem Aufbau des Gerätes den Treibkolben nach dem Setzvorgang in seine Ausgangsposition zurückkehren zu lassen. Es kann unmittelbar nach dem Setzvorgang ein neues Befestigungselement eingesetzt werden.The arrangement of a spring when setting the fastener tensioned against their spring force makes it possible with a simple construction of the device after the driving piston return to its starting position to let. It can be a new one immediately after the setting process Fastener can be used.

In Weiterbildung der Erfindung kann vorgesehen sein, daß der Treibkolben eine Kolbenstange mit verringertem Durchmesser aufweist, die über mindestens einen Teil ihrer Länge von der hülsenartig ausgebildeten Feder umgeben ist.In a development of the invention it can be provided that the Driving piston a piston rod with a reduced diameter has at least part of its length from the sleeve-like spring is surrounded.

Die von der Erfindung vorgeschlagene Feder wird beim Montieren des Gerätes einfach über die Kolbenstange aufgesetzt und das Gerät dann zusammengesetzt. Es muß nicht mehr darauf geachtet werden, daß die einzelnen Tellerfedern abwechselnd immer in umgekehrter Position eingesetzt werden.The spring proposed by the invention is used during assembly of the device simply placed over the piston rod and the device is then assembled. You no longer have to pay attention to it be that the individual disc springs always alternate be used in the reverse position.

Erfindungsgemäß kann in Weiterbildung vorgesehen sein, daß sich die Feder zwischen einem die Bewegung des Treibkolbens nicht mitmachenden Geräteteil und dem Treibkolben erstreckt. Die Feder greift also direkt an dem Treibkolben an.According to the invention it can be provided in a further development that the spring between you the movement of the driving piston non-participating part of the device and the driving piston. The spring therefore acts directly on the driving piston.

Insbesondere kann in Weiterbildung der Erfindung vorgesehen sein, daß die Feder an einem mit dem Treibkolben zusammenwirkenden Bremselement für diesen angreift. Dies bedeutet, daß gegen Ende der Setzbewegung des Treibkolbens, wenn also die Feder stärker gespannt wird, sich diese Bewegung zum Teil in eine Bremsbewegung durch das Bremselement umsetzt.In particular, can be provided in a development of the invention be that the spring cooperates with the driving piston Braking element attacks for this. This means, that towards the end of the setting movement of the driving piston, if so the spring is tightened more, this movement is partly converted into a braking movement by the braking element.

Die auf diese Weise ausgebildete Feder kann beispielsweise eine Zugfeder sein. Besonders günstig ist es jedoch, wenn die Feder als Druckfeder ausgebildet ist, so daß sie beim Setzen des Befestigungselementes auf Druck beansprucht wird.The spring formed in this way can, for example be a tension spring. However, it is particularly favorable if the Spring is designed as a compression spring so that when you set of the fastener is stressed.

Erfindungsgemäß kann in Weiterbildung vorgesehen sein, daß die Feder über ihre Länge verteilt Versteifungselemente aufweist, die sich selbst nicht verformen. Die Versteifungselemente können insbesondere aus einem härteren und/oder anderen Material hergestellt sein. Die Verformung der Feder wird dadurch auf kleine Bereiche zwischen je zwei Verstärkungselementen konzentriert, so daß die Abweichung der Feder auch im Kompressionsfall von der etwa zylindrischen Form klein gehalten werden kann.According to the invention it can be provided in a further development that the spring has stiffening elements distributed over its length, that don't deform themselves. The stiffening elements can in particular from a harder and / or other Material. This causes the spring to deform on small areas between two reinforcement elements concentrated so that the deviation of the spring in the Compression case kept small by the approximately cylindrical shape can be.

Insbesondere kann in Weiterbildung vorgesehen sein, daß die Versteifungselemente während der Bewegung des Treibkolbens von diesem und/oder von der Laufbahn des Kolbens geführt werden. Es kann also nicht vorkommen, daß die aus Elastomermaterial bestehende Feder während der sehr schnellen Einschubbewegung einseitig verformt wird oder sich so verknäult, daß sie die Einschubbewegung des Kolbens behindert oder aber durch diese zerstört wird. In particular, it can be provided in further training that the Stiffening elements during the movement of the driving piston be guided by this and / or by the piston raceway. So it can not happen that the elastomeric material existing spring during the very fast insertion movement is deformed on one side or convoluted so that it hinders the insertion movement of the piston or else is destroyed by this.

Insbesondere kann vorgesehen sein, daß die Versteifungselemente metallische Ringscheiben sind, deren Außendurchmesser etwa dem Innendurchmesser der Kolbenlaufbahn entspricht, so daß sie an ihrer Außenseite geführt werden. Weiterhin kann ihr Innendurchmesser etwa dem Außendurchmesser der Kolbenstange entsprechen, so daß sie auch an ihrer Innenseite geführt werden und dadurch an einer Verkantung gehindert werden.In particular, it can be provided that the stiffening elements are metallic washers, their outer diameter corresponds approximately to the inside diameter of the piston raceway, so that they are guided on their outside. Furthermore can their inside diameter is about the outside diameter of the piston rod correspond so that they are also guided on the inside be prevented from jamming.

Erfindungsgemäß kann vorgesehen sein, daß die Feder mit den Verstärkungselementen zusammen vulkanisiert ist. Dadurch entsteht eine einstückige, als Einzelelement herstellbare Feder, die alle gewünschten Eigenschaften aufweist.According to the invention it can be provided that the spring with the Reinforcing elements is vulcanized together. This creates a one-piece spring that can be manufactured as a single element, which has all the desired properties.

Insbesondere kann vorgesehen sein, daß die Feder eine Wandstärke aufweist, die höchstens halb so groß, vorzugsweise höchstens ein Drittel so groß ist wie die Differenz zwischen dem Radius der Verstärkungselemente und dem Radius der Innenöffnung der Verstärkungselemente. Dadurch wird dafür gesorgt, daß die Feder im komprimierten Zustand eine relativ kleine axiale Länge aufweist, die im wesentlichen nur durch die Dicke aller Verstärkungselemente bestimmt wird, die damit fast auf Block aneinander anliegen.In particular, it can be provided that the spring has a wall thickness has, which is at most half as large, preferably is at most a third of the difference between the radius of the reinforcing elements and the radius of the inner opening of the reinforcement elements. This will ensure that the spring is a relative in the compressed state has small axial length, which is essentially only by the thickness of all reinforcing elements is determined, so that lie close to each other on a block.

Die hülsenartige Feder ist dabei mit Vorteil in der Nähe der Innenöffnung der Verstärkungselemente und damit in der Nähe der Kolbenstange angeordnet. Ihre Verformung erfolgt daher in erster Linie radial nach außen.The sleeve-like spring is advantageously close to the Inner opening of the reinforcement elements and therefore nearby arranged the piston rod. Their deformation therefore takes place in primarily radially outwards.

In unverformtem Zustand kann die Feder vorzugsweise eine zylindrische Form aufweisen.In the undeformed state, the spring can preferably be a cylindrical one Have shape.

Die Verstärkungselemente können insbesondere äquidistant angeordnet werden, was unter anderem dazu führt, daß es kein vorderes und hinteres Ende der Feder gibt. Die Orientierung der Feder beim Zusammensetzen des Gerätes ist daher unkritisch.The reinforcing elements can in particular be arranged equidistantly , which among other things means that there is no front and rear ends of the spring there. The orientation the spring when assembling the device is therefore not critical.

Die Verstärkungselemente können mit Vorteil so angeordnet werden, daß ihr gegenseitiger Abstand etwa ihrem halben Durchmesser entspricht.The reinforcing elements can advantageously be arranged in this way be that their mutual distance is about half their size Corresponds to diameter.

Weitere Merkmale, Einzelheiten und Vorzüge ergeben sich aus den Patentansprüchen, deren Wortlaut durch Bezugnahme zum Inhalt der Beschreibung gemacht wird, der folgenden Beschreibung einer bevorzugten Ausführungsform der Erfindung sowie anhand der Zeichnung. Hierbei zeigen:

Fig. 1
einen schematischen Längsschnitt durch die wichtigsten Teile eines Bolzenschubgerätes nach der Erfindung;
Fig. 2
in vergrößertem Maßstab eine Stirnansicht eines als Ringscheibe ausgebildeten Verstärkungselementes für eine Feder der Anordnung nach Fig. 1.
Further features, details and advantages emerge from the patent claims, the wording of which is made by reference to the content of the description, the following description of a preferred embodiment of the invention and with reference to the drawing. Here show:
Fig. 1
a schematic longitudinal section through the most important parts of a bolt pusher according to the invention;
Fig. 2
on an enlarged scale an end view of a reinforcing element designed as an annular disk for a spring of the arrangement according to FIG. 1.

Die Fig. 1 zeigt einen vereinfachten Längsschnitt durch ein Bolzenschubgerät nach der Erfindung. Das Bolzenschubgerät nach der Erfindung enthält ein hinteres Gehäuse 1, in dem unter anderem die Einrichtungen zum Zuführen und Zünden einer Treibladung enthalten sind. Diese Einzelheiten sind nicht dargestellt. In dem Gehäuse 1 ist die Kolbenhülse 2 untergebracht, die an ihrer Innenseite einen zylindrischen Raum 3 bildet. In dem zylindrischen Raum 3 ist ein Treibkolben 4 untergebracht, der mit Hilfe nicht dargestellter Dichtungen gegenüber dem Raum 3 abgedichtet ist. Der Treibkolben 4 kann in dem Zylinderraum 3 verschoben werden. Diese Verschiebebewegung wird durch eine auf der in Fig. 1 rechten Seite des Treibkolbens 4 gezündete Treibladung hervorgerufen.Fig. 1 shows a simplified longitudinal section through a Bolt thruster according to the invention. The bolt pusher according to the invention includes a rear housing 1 in which including the facilities for feeding and igniting one Propellant charge are included. These details are not shown. The piston sleeve 2 is accommodated in the housing 1, which has a cylindrical space 3 on its inside forms. In the cylindrical space 3 there is a driving piston 4 housed, with the help of seals, not shown is sealed off from room 3. The driving piston 4 can to be moved in the cylinder space 3. This shifting movement is indicated by a on the right in Fig. 1 of the Driving piston 4 ignited propellant charge.

Im vorderen, d.h. in Fig. 1 linken Ende des Zylinderraumes 3 ist ein Ringelement 5 aus Elastomermaterial untergebracht, das an einer Stirnwand 6 der Kopfhülse 11 anliegt und einen Bremspuffer bildet. Auf der der Stirnwand 6 abgewandten Seite des Bremspuffers 5 liegt ein im Innern der Hülse 2 verschiebbarer Bremskonus 7 an. Der Bremskonus 7 weist eine sich in Richtung auf den Treibkolben 4 trichterförmig erweiternde Innenöffnung 8 auf.In the front, i.e. 1 left end of the cylinder space 3 a ring element 5 made of elastomer material is accommodated, that abuts an end wall 6 of the head sleeve 11 and one Brake buffer forms. On the end wall 6 facing away Side of the brake buffer 5 is located inside the sleeve 2 sliding brake cone 7. The brake cone 7 has one widening in a funnel shape in the direction of the driving piston 4 Inner opening 8.

An der vorderen Stirnfläche des Treibkolbens 4, d.h. auf der der Treibladung abgewandten Seite, ist an dem Treibkolben 4 eine Kolbenstange 9 angebracht, die in ihrer ersten, sich an den Treibkolben 4 unmittelbar anschließenden Hälfte einen ersten Durchmesser und in dem sich daran anschließenden, zum freien Ende hin orientierten Bereich einen zweiten, nochmals verkleinerten Druchmesser aufweist.On the front end face of the driving piston 4, i.e. on the the side facing away from the propellant charge is on the propellant piston 4 a piston rod 9 attached in its first to itself the driving piston 4 immediately adjacent half first diameter and in the following, for free end towards a second, again has reduced diameter.

Zwischen der Kolbenstange 9 und der Hülse 2 ist dadurch ein Ringraum gebildet, in dem eine Rückstellfeder 10 untergebracht ist. Die Rückstellfeder 10 ist etwa hülsenförmig ausgebildet und erstreckt sich zwischen der die Kolbenstange 9 aufweisenden Stirnfläche des Treibkolbens 4 und der entsprechenden gegenüberliegenden Stirnseite des Bremselementes 7.This is a between the piston rod 9 and the sleeve 2 Annulus formed in which a return spring 10 housed is. The return spring 10 is approximately sleeve-shaped and extends between the piston rod 9 having end face of the driving piston 4 and the corresponding opposite end face of the braking element 7.

Auf das vordere Ende der Hülse 2 ist eine äußere Kopfhülse 11 aufgesetzt, die einen zylindrischen Innenraum 12 zur Aufnahme des eigentlichen Befestigungselementes aufweist. Der Boden des zylindrischen Innenraumes 12 weist eine Öffnung auf, durch die das vordere Ende der Kolbenstange 9 hindurchragt. On the front end of the sleeve 2 is an outer head sleeve 11 placed a cylindrical interior 12 for receiving of the actual fastener. The floor of the cylindrical interior 12 has an opening, through which the front end of the piston rod 9 projects.

Auf der Kopfhülse 11 ist in Axialrichtung verschiebbar eine Aufsetzhülse 13 gelagert, deren freie Stirnfläche 14 ringförmig ausgebildet ist und etwas gegenüber der Stirnkante 15 der Kopfhülse 11 vorsteht. Die Aufsetzhülse 13 geht auf ihrer dem Gerät zugewandten Seite in einen radialen Flansch 16 über, an dessen Stirnseite ein Elastomerpuffer 17 angebracht ist.On the head sleeve 11 is slidable in the axial direction Mount sleeve 13 mounted, the free end face 14 annular is formed and slightly opposite the front edge 15 of the Head sleeve 11 protrudes. The mounting sleeve 13 goes on their Device facing side in a radial flange 16 on the end face of which an elastomeric buffer 17 is attached.

Die Rückstellfeder 10 weist die Form einer zylindrischen, langgestreckten Hülse 18 aus Elastomermaterial auf, die durch entsprechende Öffnungen einer vielzahl von Verstärkungselementen 19 hindurch vulkanisiert ist. Die Verstärkungselemente 19 sind mit gleichem Abstand längs der Elastomerhülse 18 angeordnet. Sie liegen mit ihren Außenrändern mit geringem Abstand vor der Innenwand des zylindrischen Innenraumes 3. Die Verstärkungselemente 19 weisen koaxial eine zentrale Öffnung 20 in Form eines kreisrunden Lochs auf, mit denen sie auf der Kolbenstange 19 aufgereiht sind. Der Innendurchmesser dieses Loches 20 entspricht etwa dem Außendurchmesser des dickeren Bereiches der Kolbenstange 9.The return spring 10 has the shape of a cylindrical, elongated sleeve 18 made of elastomer material through corresponding openings of a variety of reinforcing elements 19 is vulcanized through. The reinforcement elements 19 are arranged at the same distance along the elastomer sleeve 18. They lie with their outer edges at a short distance in front of the inner wall of the cylindrical interior 3. The Reinforcing elements 19 have a central opening coaxially 20 in the form of a circular hole, with which they on the Piston rod 19 are lined up. The inside diameter of this Hole 20 corresponds approximately to the outer diameter of the thicker Area of the piston rod 9.

Die Wandstärke der Elastomerhülse 18 entspricht etwa einem Viertel bis einem Drittel des Abstandes zwischen dem Außenumfang des dickeren Teils der Kolbenstange 9 und dem Innendurchmesser des Zylinderraumes 3 bzw. dem Außendurchmesser des Treibkolbens 4. Die Anordnung der Elastomerhülse 18 ist so gewählt, daß diese nahe der zentralen Mittelöffnung 20 der Verstärkungselemente 19 angeordnet ist.The wall thickness of the elastomer sleeve 18 corresponds approximately to one A quarter to a third of the distance between the outer circumference the thicker part of the piston rod 9 and the inner diameter of the cylinder space 3 or the outer diameter of the driving piston 4. The arrangement of the elastomer sleeve 18 is chosen so that this near the central central opening 20 of the Reinforcing elements 19 is arranged.

Fig. 1 zeigt das Gerät in der Ausgangsposition, in der der Treibkolben 4 bis fast vor das hintere Ende des Zylinderraumes 3 geschoben ist. In dieser Position kann ein Befestigungselement in den Innenraum 12 der Kopfhülse 11 eingeführt werden. Die Rückstellfeder 10 ist entspannt. Wird nun zum Setzen eines Befestigungselementes eine Treibgaskartusche gezündet, so bewegt sich der Treibkolben 4 mit hoher Geschwindigkeit aus der dargestellten Ausgangsposition in die Setzposition, d.h. in Fig. 1 nach links. Dies führt dazu, daß die Rückstellfeder komprimiert wird. Da die Verstärkungselemente 19, die aus Metall bestehen, sich nicht verformen und andererseits sowohl an der Kolbenstange 9 als auch an der Wand des Zylinderraumes 3 geführt werden, verformt sich die Hülse 18 nur im Bereich zwischen den Verstärkungselementen 19, in dem das Material in erster Linie nach außen verformt wird. Die Feder 10 verkürzt sich also zieharmonikaartig, wobei die Verformung der Elastomerhülse 18 gleichmäßig über die Länge der Feder verteilt wird.Fig. 1 shows the device in the starting position in which the Driving piston 4 to almost in front of the rear end of the cylinder space 3 is pushed. In this position, a fastener can inserted into the interior 12 of the head sleeve 11 become. The return spring 10 is relaxed. Now becomes Put a fastener a LPG cartridge ignited, the driving piston 4 moves at high speed from the starting position shown in the Setting position, i.e. 1 to the left. This leads to the return spring is compressed. Because the reinforcing elements 19, which are made of metal, do not deform and on the other hand, both on the piston rod 9 and on the Wall of the cylinder chamber 3 are guided, the deforms Sleeve 18 only in the area between the reinforcing elements 19, in which the material primarily deforms outwards becomes. The spring 10 is shortened like an accordion, whereby the deformation of the elastomer sleeve 18 evenly over the Length of the spring is distributed.

Gegen Ende des Setzvorganges, wenn die Feder 10 also fast vollständig verformt ist und die einzelnen Verstärkungselemente 19 fast auf Block liegen, wird der verbleibende Impuls des Kolbens auf das Bremselement 7 ausgeübt, der den Bremspuffer 5 komprimiert. Diese Komprimierung des Bremspuffers 5 führt zu einer Verringerung seines Innendurchmessers und dadurch zu einem Abbremsen der Kolbenstange 9 bis zum Stillstand. Der dabei auftretende Restschub wird dann durch das Pufferelement 17 abgebremst. Nach dem Setzen des Befestigungselementes schiebt die Feder 10 den Treibkolben 4 in die dargestellte Ausgangsposition zurück.Towards the end of the setting process, when the spring 10 almost is completely deformed and the individual reinforcing elements 19 almost on block, the remaining impulse of the piston exerted on the brake element 7, the brake buffer 5 compressed. This compression of the brake buffer 5 leads to a reduction in its inner diameter and thereby braking the piston rod 9 to a standstill. The residual thrust that occurs is then caused by the Buffer element 17 braked. After placing the fastener the spring 10 pushes the driving piston 4 into the shown starting position back.

Fig. 2 zeigt eine vergrößerte Aufsicht auf ein Verstärkungselement 19. Das Verstärkungselement 19 weist die Form einer metallischen kreisrunden Ringscheibe 21 auf, beispielsweise aus Aluminium. Konzentrisch zu der Zentralöffnung 20 ist eins Kreis von kleineren kreisrunden Öffnungen 22 vorhanden. Diese Öffnungen 22 entsprechen in ihrer Anordnung und ihrem Durchmesser der Anordnung und der Wandstärke der Elastomerhülse 18. Durch diese Löcher 22 wird die Elastomerhülse 18 hindurch vulkanisiert, wobei eine Verbindung mit den metallischen Scheiben 21 erfolgt. Dadurch entsteht eine als ein einzelnes Bauteil ausgebildete Feder, die aufgrund der Verstärkungselemente in der Anordnung der Fig. 1 gegen ein Ausknicken gesichert ist.Fig. 2 shows an enlarged plan view of a reinforcing element 19. The reinforcing element 19 has the shape of a metallic circular washer 21, for example made of aluminium. Concentric to the central opening 20 is one Circle of smaller circular openings 22 present. This Openings 22 correspond in their arrangement and their diameter the arrangement and the wall thickness of the elastomer sleeve 18. The elastomer sleeve 18 is passed through these holes 22 vulcanized, connecting with the metallic Discs 21 takes place. This creates one as a single Component trained spring due to the reinforcing elements secured in the arrangement of FIG. 1 against buckling is.

Claims (15)

  1. A stud driver having
    1.1 a housing (1),
    1.2 a reciprocating driving piston (4) arranged in the housing (1) that
    1.2.1 may be driven by a driving charge and
    1.2.2 is configured for setting fasteners, and
    1.3 a return spring (10) fabricated from an elastically deformable material, in particular, an elastomeric material, for returning the driving piston (4) to its initial position following a setting operation
    1.4 that has essentially nondeforming stiffening elements (19) distributed over its length,
       wherein
    1.5 the elastomeric portion of the return spring (10) is configured from a single piece of elastomeric material and
    1.6 is in the form of an elastic sleeve (18).
  2. A stud driver according to claim 1, wherein the driving piston (4) has a piston rod (9) having a smaller diameter that is surrounded by the sleeve-shaped return spring (10) over at least part of its length.
  3. A stud driver according to claim 1 or claim 2, wherein the return spring (10) extends between a part (7) of the driver that does not participate in the motions of the driving piston (4) and the driving piston (4).
  4. A stud driver according to any of the foregoing claims, wherein the return spring (10) engages a braking element (7) for the driving piston (4) that interacts with the latter. p
  5. A stud driver according to any of the foregoing claims, wherein the return spring (10) is a compression spring.
  6. A stud driver according to any of the foregoing claims, wherein the stiffening elements (19) are guided by the driving piston (4) and/or the raceway of the driving piston (4) during the latter's motions.
  7. A stud driver according to any of the foregoing claims, wherein the stiffening elements (19) are preferably circular washers (21) fabricated from metal, hard rubber, or plastic whose outer diameter approximately equals the inner diameter of the piston raceway, and whose inner diameter approximately equals the outer diameter of the piston rod (9).
  8. A stud driver according to any of the foregoing claims, wherein the stiffening elements (19) and the elastic sleeve (18) are vulcanized together.
  9. A stud driver according to any of the foregoing claims, wherein the elastic sleeve (18) has a wall thickness that is no more than half the difference between the radius of the stiffening elements (19) and the radius of the internal apertures (20) of the stiffening elements.
  10. A stud driver according to claim 9, wherein the elastic sleeve (18) is closer to the internal apertures (20) of the stiffening elements than to their outer circumferences.
  11. A stud driver according to any of the foregoing claims, wherein the return spring (10) is cylindrical when in its undeformed state.
  12. A stud driver according to any of the foregoing claims, wherein the stiffening elements (19) are arranged equidistant from one another.
  13. A stud driver according to any of claims 1 - 11, wherein the stiffening elements (19) are spaced at varying distances from one another, in particular, are spaced at shorter intervals in the vicinities of the ends of the spring.
  14. A stud driver according to any of the foregoing claims, wherein the distance between two neighboring stiffening elements (19) approximately equals half their outer diameter.
  15. A spring for returning the driving piston (4) of a stud driver according to any of claims 1 - 14 to its initial position following a setting operation that is fabricated from an elastomeric material and has essentially nondeforming stiffening elements (19) distributed over its length, wherein the elastomeric portion of the spring (10) is configured from a single piece of elastomeric material and is in the form of an elastic sleeve (18).
EP97115895A 1996-09-19 1997-09-12 Fastening tool and a returning spring therefor Expired - Lifetime EP0830920B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK97115895T DK0830920T3 (en) 1996-09-19 1997-09-12 Bolt laying apparatus and retraction spring therefor

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19638341A DE19638341A1 (en) 1996-09-19 1996-09-19 Bolt thruster and spring therefor
DE19638341 1996-09-19
US09/061,633 US6182881B1 (en) 1996-09-19 1998-04-16 Stud driver and spring therefor

Publications (2)

Publication Number Publication Date
EP0830920A1 EP0830920A1 (en) 1998-03-25
EP0830920B1 true EP0830920B1 (en) 2004-07-21

Family

ID=26029563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97115895A Expired - Lifetime EP0830920B1 (en) 1996-09-19 1997-09-12 Fastening tool and a returning spring therefor

Country Status (8)

Country Link
US (1) US6182881B1 (en)
EP (1) EP0830920B1 (en)
CN (1) CN1068818C (en)
AT (1) ATE271444T1 (en)
DE (2) DE19638341A1 (en)
DK (1) DK0830920T3 (en)
ES (1) ES2225921T3 (en)
PT (1) PT830920E (en)

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Publication number Priority date Publication date Assignee Title
DE19722795A1 (en) * 1997-05-30 1998-12-03 Hilti Ag Setting tool
DE19800847A1 (en) * 1997-12-04 1999-06-17 Gerd Dr Ing Kellner Device for placing a fastening element in a setting surface and using the device
DE10105886C2 (en) * 2001-02-09 2002-12-05 Hilti Ag piston holder
US6779698B2 (en) * 2001-10-15 2004-08-24 Hwai-Tay Lin Abrasion-resistant bumper for a nail-driving tool
JP3818234B2 (en) * 2002-07-19 2006-09-06 日立工機株式会社 Nailer
DE10341384B4 (en) * 2003-09-05 2016-06-23 Hilti Aktiengesellschaft setting tool
US7726536B2 (en) * 2004-04-02 2010-06-01 Black & Decker Inc. Upper bumper configuration for a power tool
EP1674213B1 (en) * 2004-12-23 2008-10-01 BLACK & DECKER INC. Power tool cooling
EP1674214B1 (en) * 2004-12-23 2008-05-28 BLACK & DECKER INC. Power tool housing
EP1674212B1 (en) * 2004-12-23 2008-05-28 BLACK & DECKER INC. Power tool housing
DE102005000179A1 (en) * 2005-12-07 2007-06-14 Hilti Ag Hammer striker
WO2023135041A1 (en) * 2022-01-14 2023-07-20 Fischerwerke Gmbh & Co. Kg Fastening tool for driving a fastening element into a base

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Also Published As

Publication number Publication date
DE19638341A1 (en) 1998-03-26
ATE271444T1 (en) 2004-08-15
DE59711784D1 (en) 2004-08-26
US6182881B1 (en) 2001-02-06
CN1181299A (en) 1998-05-13
ES2225921T3 (en) 2005-03-16
EP0830920A1 (en) 1998-03-25
PT830920E (en) 2004-09-30
CN1068818C (en) 2001-07-25
DK0830920T3 (en) 2004-11-29

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