EP0579575B1 - Powder-actuated setting tool - Google Patents
Powder-actuated setting tool Download PDFInfo
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- EP0579575B1 EP0579575B1 EP93810460A EP93810460A EP0579575B1 EP 0579575 B1 EP0579575 B1 EP 0579575B1 EP 93810460 A EP93810460 A EP 93810460A EP 93810460 A EP93810460 A EP 93810460A EP 0579575 B1 EP0579575 B1 EP 0579575B1
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- European Patent Office
- Prior art keywords
- recess
- drive piston
- setting tool
- piston
- equals
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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 relates to a powder-operated setting tool with a driving piston, which is guided in a piston guide closed at the end facing away from the driving direction by a bottom part, the bottom part being penetrated by a central passage channel connected to a propellant charge receiving chamber, and the end of the driving piston facing the bottom part being a recess having.
- Powder-operated setting tools in which a propellant charge is usually ignited by impact and a driving piston is accelerated by the high pressure that arises when powder is burned, are used extensively, particularly in series production, for driving in fastening elements.
- the propellant charges can be sleeveless cartridges consisting of a powder compact, or cartridges can be used which consist of a metal housing, a plastic housing or a housing made from both of these materials, conventionally known powder being arranged within this housing.
- the power depends on the pressure acting on the driving piston, which pressure in turn depends on the quantity of powder burned.
- the pressure also depends on purely constructive measures of the device parts involved, such as tightness, displacement, weight ratios and the like.
- the invention has for its object to provide a powder-powered setting tool, in which on the one hand no contamination occurs from unburned powder and which on the other hand brings high performance values.
- the object is achieved in that the recess in the driving piston is arranged in a central circular ring and has a cross section which extends radially to the longitudinal axis of the driving piston and is essentially semicircular towards the front end of the driving piston, the outer mouth diameter of the recess corresponding approximately to twice the diameter, which forms the semicircular cross section of the depression and the passage channel opens into a central recess open towards the driving piston, the opening diameter of which exceeds the outer opening diameter of the recess in the driving piston.
- the inventive design of the driving piston and the bottom part has the consequence that the unburned powder parts are thrown into the recess of the driving piston. Thanks to the design of this recess, the unburned powder fractions are thrown radially outwards from the center into the colder zone of the driving piston and, due to the semicircular design, are deflected such that they reach the recess in the base part. There they are directed to the hot zone, namely to the central passage, where they burn. Two effects are thus achieved with the design according to the invention. On the one hand, there is a space available for the unburned powder that prevents them from getting into the guide gap.
- the space namely the depression in the driving piston, is designed in such a way that the unburned powder components are thrown back into the hot zone and also burn there, so that on the one hand they are available to build up pressure and thus increase performance and on the other hand they can no longer cause equipment contamination.
- the mouth diameter of the recess is slightly larger than the mouth diameter of the depression. This creates an exposed ring shoulder in the projection in the direction of the longitudinal axis of the driving piston, which protrudes along the circumference into the recess.
- the depth measured parallel to the axial direction was expediently 0.05 to 0.2 times and the mouth diameter 0.2 to 0.8 times the guide area of the driving piston surrounding the depression is.
- a radius has proven particularly useful, which is expediently 0.05 to 0.2 times the guide area of the driving piston surrounding the recess.
- diameter ratios have proven useful, in which the opening diameter of the recess is advantageously 1.05 to 1.15 times the opening diameter of the recess in the driving piston.
- the volume of the recess in the driving piston and the recess in the base part can be approximately the same.
- the depth of the recess in the base part measured parallel to the longitudinal axis of the driving piston, is expediently about 0.05 to 2 times the guide area of the driving piston surrounding the recess.
- the transition from the mouth to the The bottom of the recess is advantageously concavely curved and expediently under a radius, this radius essentially corresponding to the radius of the depression. As a result, there is no disruption by deflecting the unburned powder components moving along part of a circular path.
- FIG. 1 shows the rear region of a piston guide 1 of a powder-operated setting tool which is known per se and is therefore not shown in the drawing.
- a driving piston 2 is mounted within this piston guide, and FIG. 1 also shows the rear region.
- the piston guide 1 has a bottom part 3 which serves for rearward closing.
- This base part 3 has a passage channel 4 which opens into a propellant charge receiving chamber 5 counter to the driving direction.
- this propellant charge receiving chamber 5 as shown in FIG. 1, for example, there is a still non-ignited cartridge 6.
- the passage channel 4 opens into a central recess 7 which is open in the driving direction and thus towards the driving piston 2.
- This recess 7 has an orifice diameter which is significantly larger than the diameter of the passage 4.
- the driving piston 2 is provided in the driving direction with a shaft 8 known per se.
- the guide region 2a of the driving piston 2, which adjoins the shaft 8 counter to the driving direction, is in a known manner with circumferential grooves 9 provided which sealing purposes serve, inter alia, by additional accommodation of sealing rings.
- the front end of the driving piston 2 has a recess 10 which - as shown in particular in FIG. 2 - is arranged in a ring.
- the recess 10, seen radially to the longitudinal axis of the driving piston 2 has a substantially semicircular cross section.
- a nose 11 forms in the center of the driving piston 2, the largest elevation of which coincides with the front end of the driving piston 2.
- the outer mouth diameter of the recess 7 in the bottom part 3 of the piston guide 1 is larger than the outer mouth diameter of the recess 10 in the driving piston 2. Thanks to this design of the outer mouth diameter of the recess 7 and the recess 10, there can be no shoulder at the transition form, which adversely affects the deflection of the unburned powder portions of the cartridge 6 indicated by arrows.
- a conventional propellant charge provided with a metal jacket is shown as cartridge 6.
- the present invention does not only extend to such propellant charges.
- the problem that needs to be solved here arises with all types of propellant charges, regardless of whether they are provided with a metal or plastic jacket or whether they are completely caseless compacts.
- the solution according to the invention can thus be applied to all types of powder-operated setting devices.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Portable Nailing Machines And Staplers (AREA)
Description
Die Erfindung betrifft ein pulverkraftbetriebenes Setzgerät mit einem Treibkolben, der in einer an dem der Eintreibrichtung abgewandten Ende von einem Bodenteil verschlossenen Kolbenführung geführt ist, wobei das Bodenteil von einem mit einer Treibladungsaufnahmekammer verbundenen zentralen Durchtrittskanal durchsetzt ist und das dem Bodenteil zugewandte Stirnende des Treibkolbens eine Vertiefung aufweist.The invention relates to a powder-operated setting tool with a driving piston, which is guided in a piston guide closed at the end facing away from the driving direction by a bottom part, the bottom part being penetrated by a central passage channel connected to a propellant charge receiving chamber, and the end of the driving piston facing the bottom part being a recess having.
Pulverkraftbetriebene Setzgeräte, bei welchen meistens durch Schlageinwirkung eine Treibladung gezündet wird und durch den bei der Verbrennung von Pulver entstehenden hohen Druck ein Treibkolben beschleunigt wird, werden insbesondere bei Serienanwendung zum Eintreiben von Befestigungselementen in grossem Umfange verwendet. Bei den Treibladungen kann es sich um hülsenlose, aus einem Pulverpressling bestehende Kartuschen handeln, oder es können Kartuschen verwendet werden, die aus einem Metallgehäuse, einem Kunststoffgehäuse oder einem Gehäuse aus beiden dieser Materialien bestehen, wobei innerhalb dieser Gehäuse herkömmlich bekanntes Pulver angeordnet ist.Powder-operated setting tools, in which a propellant charge is usually ignited by impact and a driving piston is accelerated by the high pressure that arises when powder is burned, are used extensively, particularly in series production, for driving in fastening elements. The propellant charges can be sleeveless cartridges consisting of a powder compact, or cartridges can be used which consist of a metal housing, a plastic housing or a housing made from both of these materials, conventionally known powder being arranged within this housing.
Für das Eintreiben der Befestigungselemente ist je nach Anwendungsfall eine bestimmte Leistung der Setzgeräte erforderlich. Die Leistung hängt vom Druck, der auf den Treibkolben einwirkt, ab, wobei dieser Druck seinerseits insbesondere von der Menge des verbrannten Pulvers abhängt. Daneben hängt der Druck auch noch von rein konstruktiven Massnahmen der jeweils beteiligten Geräteteile ab, wie Dichtheit, Verdrängungsvolumen, Gewichtsverhältnisse und dgl.Depending on the application, a certain performance of the setting tools is required to drive in the fastening elements. The power depends on the pressure acting on the driving piston, which pressure in turn depends on the quantity of powder burned. In addition, the pressure also depends on purely constructive measures of the device parts involved, such as tightness, displacement, weight ratios and the like.
Die Erfahrung hat gezeigt, dass die Verbrennung des Pulvers der Treibladung von Beginn weg ausserordentlich schnell abläuft. Dabei wird der in unmittelbarer Nähe eines in aller Regel im Bodenbereich der Kartusche angeordneten Zündsatzes liegende Pulveranteil sofort gezündet, so dass in diesem Bereich ein Druck erzeugt wird, was zur Folge hat, dass der daran angrenzende Pulveranteil ungezündet weggeschleudert wird. Nachdem in üblicher Weise die Treibladungen von einer von dem der Setzrichtung abgewandten Ende auf den Zündsatz einwirkenden Zündeinrichtung gezündet werden, hat dies zur Folge, dass der ungezündete Pulveranteil in Setzrichtung weggeschleudert wird, dh in Richtung Treibkolben und Kolbenführung. Somit führen die in dieser Richtung weggeschleuderten unverbrannten Pulveranteile zu einer Verschmutzung der Geräteteile, dh insbesondere der Kolbenführung und des Treibkolbens, was schlussendlich zu Funktionsstörungen führen kann.Experience has shown that the combustion of the powder in the propellant charge is extremely fast right from the start. In this case, the powder portion located in the immediate vicinity of an ignition charge, which is generally arranged in the base area of the cartridge, is ignited immediately, so that a pressure is generated in this area, with the result that the adjoining powder portion is flung away without ignition. After the propellant charges are ignited in the usual way by an ignition device acting on the igniter from the end facing away from the setting direction, this has the consequence that the unignited portion of the powder is thrown away in the setting direction, ie in the direction of the driving piston and piston guide. Thus, the unburned powder components flung away in this direction lead to contamination of the device parts, ie in particular the piston guide and the driving piston, which can ultimately lead to malfunctions.
Zur Behebung dieser Nachteile wurde versucht, einen Raum zu schaffen, welcher der Aufnahme der unverbrannten Pulveranteile dient, so dass diese nicht in Führungsspalte zwischen Treibkolben und Kolbenführung eindringen und diese Teile verschmutzen. Zur Bildung eines solchen Raumes steht das rückwärtige Stirnende des Treibkolbens zur Verfügung, wie dies die CH-PS 3 666 007 zeigt.In order to remedy these disadvantages, attempts have been made to create a space which is used to hold the unburned powder components so that they do not penetrate into the guide gap between the driving piston and the piston guide and contaminate these parts. To form such a space, the rear end of the driving piston is available, as shown in CH-
Bei einem solch bekannten Gerät,wie dies die vorgenannte Veröffentlichung zeigt, kann die Problematik der Verschmutzung von Geräteteilen zu einem grossen Teil behoben werden, da die unverbrannten Pulveranteile in die im Stirnende des Treibkolbens zentrisch angeordnete Vertiefung gelangen. Diese Vertiefung hat insbesondere den Effekt, dass sich der Druck bereits derart entspannt, dass keine unverbrannten Pulveranteile in Führungsspalte des Setzgerätes gelangen. Diese Verbesserung muss allerdings mit einem anderen Nachteil erkauft werden, nämlich, dass die aufgrund der Vertiefung erzeugte Druckentspannung zu einem Leistungsverlust führt. Dieser Leistungsverlust ist vom Volumen der Vertiefung abhängig, wobei ein zu kleines Volumen der Vertiefung, welches für den Leistungsverlust weniger schädlich wäre, wieder zum Nachteil führt, dass die Druckentspannung zu klein wird, so dass die unverbrannten Pulveranteile wieder in die Führungsspalte gelangen.In such a known device, as shown in the aforementioned publication, the problem of contamination of device parts can be largely remedied, since the unburned powder components reach the depression arranged centrally in the front end of the driving piston. This indentation has the particular effect that the pressure is already released in such a way that no unburned powder particles get into the guide gap of the setting tool. However, this improvement has to be bought with another disadvantage, namely that the pressure relief generated due to the depression leads to a loss of performance. This loss of performance depends on the volume of the recess, with an insufficient volume of the recess, which would be less harmful for the loss of output, again leads to the disadvantage that the pressure release becomes too small, so that the unburned powder components get back into the guide gap.
Der Erfindung liegt die Aufgabe zugrunde, ein pulverkraftbetriebenes Setzgerät zu schaffen, bei welchem einerseits keine Verschmutzung durch unverbrannte Pulveranteile auftritt und welches andererseits hohe Leistungswerte bringt.The invention has for its object to provide a powder-powered setting tool, in which on the one hand no contamination occurs from unburned powder and which on the other hand brings high performance values.
Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass die Vertiefung im Treibkolben zentrisch kreisringförmig angeordnet ist sowie einen radial zur Längsachse des Treibkolbens verlaufenden, im wesentlichen halbkreisförmig zum Stirnende des Treibkolbens hin geöffneten Querschnitt aufweist, wobei der äussere Mündungsdurchmesser der Vertiefung etwa dem doppelten Durchmesser entspricht, welcher den halbkreisförmigen Querschnitt der Vertiefung bildet und der Durchtrittskanal in eine zum Treibkolben hin offene zentrische Ausnehmung mündet, deren Mündungsdurchmesser den äusseren Mündungsdurchmesser der Vertiefung im Treibkolben übersteigt.According to the invention, the object is achieved in that the recess in the driving piston is arranged in a central circular ring and has a cross section which extends radially to the longitudinal axis of the driving piston and is essentially semicircular towards the front end of the driving piston, the outer mouth diameter of the recess corresponding approximately to twice the diameter, which forms the semicircular cross section of the depression and the passage channel opens into a central recess open towards the driving piston, the opening diameter of which exceeds the outer opening diameter of the recess in the driving piston.
Die erfindungsgemässe Ausbildung des Treibkolbens und des Bodenteiles hat zur Folge, dass die unverbrannten Pulveranteile in die Vertiefung des Treibkolbens hineingeschleudert werden. Dank der Ausbildung dieser Vertiefung werden die unverbrannten Pulveranteile vom Zentrum radial nach aussen in die an sich kältere Zone des Treibkolbens geschleudert und aufgrund der halbkreisförmigen Ausbildung derart umgelenkt, dass sie in die Ausnehmung des Bodenteiles gelangen. Dort werden sie zur heissen Zone, nämlich zum zentralen Durchtrittskanal hin gelenkt, wo sie verbrennen. Es werden somit mit der erfindungsgemässen Ausbildung zwei Effekte erreicht. Zum einen steht für die unverbrannten Pulveranteile ein Raum zur Verfügung, der verhindert, dass sie in die Führungsspalte hineingelangen. Zum anderen ist der Raum, nämlich die Vertiefung im Treibkolben derart gestaltet, dass die unverbrannten Pulveranteile wieder in die heisse Zone zurückgeschleudert werden und dort ebenfalls verbrennen, so dass sie einerseits zum Druckaufbau und damit zur Leistungssteigerung zur Verfügung stehen und andererseits keine Geräteverschmutzungen mehr verursachen können.The inventive design of the driving piston and the bottom part has the consequence that the unburned powder parts are thrown into the recess of the driving piston. Thanks to the design of this recess, the unburned powder fractions are thrown radially outwards from the center into the colder zone of the driving piston and, due to the semicircular design, are deflected such that they reach the recess in the base part. There they are directed to the hot zone, namely to the central passage, where they burn. Two effects are thus achieved with the design according to the invention. On the one hand, there is a space available for the unburned powder that prevents them from getting into the guide gap. On the other hand, the space, namely the depression in the driving piston, is designed in such a way that the unburned powder components are thrown back into the hot zone and also burn there, so that on the one hand they are available to build up pressure and thus increase performance and on the other hand they can no longer cause equipment contamination.
Um einen ungehinderten Eintritt der in der Vertiefung umgelenkten unverbrannten Pulveranteile in die Ausnehmung im Bodenteil zu ermöglichen, ist der Mündungsdurchmesser der Ausnehmung geringfügig grösser als der Mündungsdurchmesser der Vertiefung. Es entsteht dadurch in der Projektion in Richtung Längsachse des Treibkolbens eine freiliegende Ringschulter, welche entlang des Umfanges in die Ausnehmung ragt.In order to allow unhindered entry of the unburned powder components deflected in the depression into the recess in the base part, the mouth diameter of the recess is slightly larger than the mouth diameter of the depression. This creates an exposed ring shoulder in the projection in the direction of the longitudinal axis of the driving piston, which protrudes along the circumference into the recess.
Gute Ergebnisse wurden mit bevorzugten Dimensionierungen der Vertiefung erzielt, indem zweckmässigerweise deren parallel zur Achsrichtung gemessene Tiefe das 0,05- bis 0,2-fache und deren Mündungsdurchmesser das 0,2- bis 0,8-fache des die Vertiefung umgebenden Führungsbereiches des Treibkolbens beträgt. Hinsichtlich Umlenkeigenschaften hat sich ein Radius besonders bewährt, welcher zweckmässigerweise das 0,05- bis 0,2-fache des die Vertiefung umgebenden Führungsbereiches des Treibkolbens beträgt.Good results were achieved with preferred dimensions of the depression, in that the depth measured parallel to the axial direction was expediently 0.05 to 0.2 times and the mouth diameter 0.2 to 0.8 times the guide area of the driving piston surrounding the depression is. With regard to deflection properties, a radius has proven particularly useful, which is expediently 0.05 to 0.2 times the guide area of the driving piston surrounding the recess.
Zur Bildung des die genannte Schulter bildenden Durchmessersprunges beim Uebergang von der Vertiefung im Treibkolben zur Ausnehmung im Bodenteil haben sich Durchmesserverhältnisse bewährt, bei welchen vorteilhafterweise der Mündungsdurchmesser der Ausnehmung das 1,05- bis 1,15-fache des Mündungsdurchmessers der Vertiefung im Treibkolben beträgt.For the formation of the jump in diameter forming the shoulder at the transition from the depression in the driving piston to the recess in the bottom part, diameter ratios have proven useful, in which the opening diameter of the recess is advantageously 1.05 to 1.15 times the opening diameter of the recess in the driving piston.
Die Volumen von Vertiefung im Treibkolben und Ausnehmung im Bodenteil können einander etwa gleich sein. Somit beträgt die parallel zur Längsachse des Treibkolbens gemessene Tiefe der Ausnehmung im Bodenteil zweckmässigerweise etwa das 0,05- bis 2-fache des die Vertiefung umgebenden Führungsbereiches des Treibkolbens. Um zu gewährleisten, dass die von der Vertiefung im Treibkolben in die Ausnehmung im Bodenteil zurückgeschleuderten, unverbrannten Pulveranteile ungehindert wieder in die heisse Zone zum Führungskanal hin gelenkt werden, ist der Uebergang von der Mündung zum Boden der Ausnehmung mit Vorteil konkav gewölbt und zwar zweckmässigerweise unter einem Radius, wobei dieser Radius im wesentlichen dem Radius der Vertiefung entspricht. Dadurch findet keine Störung durch Umlenken der sich entlang eines Teiles einer Kreisbahn bewegenden unverbrannten Pulveranteile statt.The volume of the recess in the driving piston and the recess in the base part can be approximately the same. Thus, the depth of the recess in the base part, measured parallel to the longitudinal axis of the driving piston, is expediently about 0.05 to 2 times the guide area of the driving piston surrounding the recess. In order to ensure that the unburned powder particles thrown back from the recess in the driving piston into the recess in the base part are directed unhindered back into the hot zone towards the guide channel, the transition from the mouth to the The bottom of the recess is advantageously concavely curved and expediently under a radius, this radius essentially corresponding to the radius of the depression. As a result, there is no disruption by deflecting the unburned powder components moving along part of a circular path.
Die Erfindung wird nunmehr anhand von Zeichnungen näher erläutert. Es zeigen:
- Fig. 1
- den rückwärtigen Bereich von Kolbenführung und Treibkolben eines pulverkraftbetriebenen Setzgerätes, teilweise geschnitten;
- Fig. 2
- das Stirnende des Treibkolbens der Fig. 2 in perspektivischer Darstellung.
- Fig. 1
- the rear area of the piston guide and driving piston of a powder-operated setting tool, partially cut;
- Fig. 2
- the front end of the driving piston of FIG. 2 in a perspective view.
Von einem an sich bekannten und daher zeichnerisch weiter nicht dargestellten pulverkraftbetriebenen Setzgerät zeigt Fig. 1 den rückwärtigen Bereich einer Kolbenführung 1. Innerhalb dieser Kolbenführung ist ein Treibkolben 2 gelagert, von welchem Fig. 1 ebenfalls den rückwärtigen Bereich zeigt.1 shows the rear region of a
Die Kolbenführung 1 weist ein dem rückwärtigen Verschliessen dienendes Bodenteil 3 auf. Dieses Bodenteil 3 weist einen Durchtrittskanal 4 auf, welcher entgegen der Eintreibrichtung in eine Treibladungsaufnahmekammer 5 mündet. In dieser Treibladungsaufnahmekammer 5 sitzt - wie Fig. 1 beispielsweise zeigt - eine noch ungezündete Kartusche 6. In Eintreibrichtung mündet der Durchtrittskanal 4 in eine zentrische Ausnehmung 7, welche in Eintreibrichtung und damit zum Treibkolben 2 hin offen ist. Diese Ausnehmung 7 weist einen Mündungsdurchmesser auf, welcher gegenüber dem Durchmesser des Durchtrittskanals 4 wesentlich grösser ist.The
Der Treibkolben 2 ist in Eintreibrichtung mit einem an sich bekannten Schaft 8 versehen. Der entgegen der Eintreibrichtung an den Schaft 8 anschliessende Führungsbereich 2a des Treibkolbens 2 ist in bekannter Weise mit umlaufenden Nuten 9 versehen, welche Dichtzwecken unter anderem durch zusätzliche Aufnahme von Dichtringen dienen. Das Stirnende des Treibkolbens 2 weist eine Vertiefung 10 auf, welche - wie insbesondere Fig. 2 zeigt - kreisringförmig angeordnet ist. Die Vertiefung 10 hat radial zur Längsachse des Treibkolbens 2 gesehen einen im wesentlichen halbkreisförmigen Querschnitt. Dadurch bildet sich im Zentrum des Treibkolbens 2 in gewisser Weise eine Nase 11, deren grösste Erhebung mit dem Stirnende des Treibkolbens 2 zusammenfällt.The
Wie Fig. 1 ferner zeigt, ist der äussere Mündungsdurchmesser der Ausnehmung 7 im Bodenteil 3 der Kolbenführung 1 grösser als der äussere Mündungsdurchmesser der Vertiefung 10 im Treibkolben 2. Dank dieser Ausbildung der äusseren Mündungsdurchmesser von Ausnehmung 7 und Vertiefung 10 kann sich am Uebergang keine Schulter bilden, welche die durch Pfeile angedeutete Umlenkung der unverbrannten Pulveranteile der Kartusche 6 störend beeinflusst.As further shown in FIG. 1, the outer mouth diameter of the
Im gezeigten Beispiel ist als Kartusche 6 eine übliche, mit einem Metallmantel versehene, Treibladung dargestellt. Die vorliegende Erfindung erstreckt sich aber nicht nur auf solche Treibladungen. Die Problematik, die es hier zu lösen gilt, entsteht bei allen Arten von Treibladungen, unabhängig davon, ob diese mit einem Metall- oder einem Kunststoffmantel versehen sind oder ob es sich um völlig hülsenlose Presslinge handelt. Damit lässt sich die erfindungsgemässe Lösung auf alle Arten von pulverkraftbetriebenen Seztgeräten anwenden.In the example shown, a conventional propellant charge provided with a metal jacket is shown as
Claims (8)
- Explosively actuated setting tool, comprising a drive piston (2), which is guided in a piston guide (1) positioned at an end which is facing away from the drive-in direction and sealed by a base section (3), and that the base section (3) is passed through by a central channel passage (4) which is connected to an explosive charge accommodating chamber (5) and that the end facing towards the base section (3) comprises a recess (10), characterized in that the recess (10) in the drive piston (2) is arranged centrally and annularly and that it has a cross-section, which extends radially to the longitudinal axis of the drive piston (2) and which is essentially semi-circularly open towards the end of the drive piston (2), and that the outside mouth diameter of the recess (10) equals approximately twice the diameter which forms the semi-circular cross-section of the recess (10), and the channel passage (4) terminates in a central recess (7) which is open towards the drive piston (2), the mouth diameter of which exceeds the outside mouth diameter of the recess (10) in the drive piston (2).
- Setting tool according to claim 1, characterized in that the depth of the recess (10), measured parallel to the longitudinal axis of the drive piston (2), equals between 0.05 and 0.2 times that of the guide area (2a) of the drive piston (2) which surrounds it.
- Setting tool according to claim 1 or 2, characterized in that the mouth diameter of the recess (10) equals between 0.2 and 0.8 times its surrounding guide area (2a) of the drive piston (2).
- Setting tool according to one of claims 1 to 3, characterized in that the essentially semi-circular structure of the recess (10) in the drive piston (2) is formed by a radius the centre of which essentially coincides with the end of the drive piston (2) and the size of which equals between 0.05 and 0.2 times that of the guide area (2a) of the drive piston (2) which surrounds the recess (10).
- Setting tool according to one of claims 1 to 4, characterized in that the mouth diameter of the recess (7) in the base section equals between 1.05 and 1.15 times that of the mouth diameter of the recess (10) in the drive piston (2).
- Setting tool according to one of claims 1 to 6, characterized in that the depth of the recess (7) as measured parallel to the longitudinal axis of the drive piston (2) equals between 0.05 to 0.2 times that of the guide area (2a) of the drive piston (2) which surrounds the recess (10).
- Setting tool according to one of claims 1 to 6, characterized in that the transition from the mouth to the base of the recess (7) is made by way of a concave curvature.
- Setting tools according to claim 7, characterized in that the concave curvature has a radius which essentially coincides with the radius of the recess (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4222961 | 1992-07-13 | ||
| DE4222961A DE4222961A1 (en) | 1992-07-13 | 1992-07-13 | Powder-powered setting tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0579575A1 EP0579575A1 (en) | 1994-01-19 |
| EP0579575B1 true EP0579575B1 (en) | 1995-06-21 |
Family
ID=6463063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93810460A Expired - Lifetime EP0579575B1 (en) | 1992-07-13 | 1993-06-28 | Powder-actuated setting tool |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5329839A (en) |
| EP (1) | EP0579575B1 (en) |
| JP (1) | JP3283643B2 (en) |
| DE (2) | DE4222961A1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19532411A1 (en) * | 1995-09-01 | 1997-03-06 | Hilti Ag | Powder-powered setting tool |
| US5722578A (en) * | 1995-09-29 | 1998-03-03 | Illinois Tool Works Inc. | High velocity, combustion-powered, fastener-driving tool |
| US6318228B1 (en) * | 1997-04-24 | 2001-11-20 | Ramtech 2000, L.L.C. | Forcible entry device |
| US6059162A (en) * | 1998-10-16 | 2000-05-09 | Illinois Tool Works Inc. | Exhaust baffle and spring assisted reset and dampener for powder actuated tool |
| US6631668B1 (en) | 2000-11-10 | 2003-10-14 | David Wilson | Recoilless impact device |
| AUPR857501A0 (en) * | 2001-10-30 | 2001-11-29 | Cetram Pty Limited | Fastener driving tools |
| DE10164202A1 (en) * | 2001-12-27 | 2003-07-17 | Hilti Ag | Piston for fixing gun has cavity with plug having centering element in form of milled peripheral surface |
| EP1812208A2 (en) * | 2004-08-30 | 2007-08-01 | Black & Decker, Inc. | Combustion fastener |
| EP2886256A1 (en) * | 2013-12-18 | 2015-06-24 | HILTI Aktiengesellschaft | Setting device |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1073977B (en) * | 1957-04-12 | 1960-01-21 | Olm Mathieson Chemical Corpo ration Nev, York N Y (V St A) | Tool whose piston is moved by powder fuel or a gaseous pressure medium |
| CH355111A (en) * | 1957-11-29 | 1961-06-15 | Termet Pierre | Gun for driving an anchor into a material |
| DE1503009B2 (en) * | 1963-08-26 | 1970-07-16 | Omark Industries Inc., Portland, Oreg. (V.St.A.) | Intercepting device for the thrust piston of an internal combustion bolt setter |
| DE1224218B (en) * | 1964-09-17 | 1966-09-01 | Tornado Gmbh | Bolt-firing device |
| US3481143A (en) * | 1967-10-13 | 1969-12-02 | Omark Industries Inc | Chamber erosion preventing powder actuated tools |
| GB1364508A (en) * | 1970-11-27 | 1974-08-21 | Mcculloch Corp | Combustion system for internal combustion engine |
| GB1388835A (en) * | 1971-06-01 | 1975-03-26 | British Screw Co Ltd | Explosive powder actuated devices |
| FR2350176A1 (en) * | 1976-05-06 | 1977-12-02 | Termet Pierre | APPARATUS ACTIVATED BY A POWDER CHARGE |
| DE3003223C2 (en) * | 1980-01-30 | 1982-06-16 | Impex-Essen Vertrieb Von Werkzeugen Gmbh, 8800 Ansbach | Cartridge ejection device on a powder-powered powder-actuated powder-actuated tool |
| US4625442A (en) * | 1984-05-22 | 1986-12-02 | Hill Richard C | Cattle stunning gun |
| DE4015449A1 (en) * | 1990-05-14 | 1991-11-21 | Hilti Ag | POWDER POWERED SETTING DEVICE |
-
1992
- 1992-07-13 DE DE4222961A patent/DE4222961A1/en not_active Withdrawn
-
1993
- 1993-06-01 US US08/069,472 patent/US5329839A/en not_active Expired - Lifetime
- 1993-06-28 EP EP93810460A patent/EP0579575B1/en not_active Expired - Lifetime
- 1993-06-28 DE DE59300282T patent/DE59300282D1/en not_active Expired - Lifetime
- 1993-07-12 JP JP17159993A patent/JP3283643B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE4222961A1 (en) | 1994-01-20 |
| JPH06155330A (en) | 1994-06-03 |
| DE59300282D1 (en) | 1995-07-27 |
| US5329839A (en) | 1994-07-19 |
| EP0579575A1 (en) | 1994-01-19 |
| JP3283643B2 (en) | 2002-05-20 |
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