EP0353400A2 - Boring ram - Google Patents

Boring ram Download PDF

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Publication number
EP0353400A2
EP0353400A2 EP89107906A EP89107906A EP0353400A2 EP 0353400 A2 EP0353400 A2 EP 0353400A2 EP 89107906 A EP89107906 A EP 89107906A EP 89107906 A EP89107906 A EP 89107906A EP 0353400 A2 EP0353400 A2 EP 0353400A2
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EP
European Patent Office
Prior art keywords
housing
collar
chisel
tip
boring machine
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.)
Granted
Application number
EP89107906A
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German (de)
French (fr)
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EP0353400B1 (en
EP0353400A3 (en
Inventor
Alfons Dipl.-Ing. Hesse
Herbert Hupertz
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Individual
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Individual
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Publication of EP0353400A2 publication Critical patent/EP0353400A2/en
Publication of EP0353400A3 publication Critical patent/EP0353400A3/en
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Publication of EP0353400B1 publication Critical patent/EP0353400B1/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers
    • E21B4/145—Fluid operated hammers of the self propelled-type, e.g. with a reverse mode to retract the device from the hole
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/17—Socket type
    • Y10T279/17042—Lost motion

Definitions

  • the invention relates to a ram boring machine with an impact piston which can be displaced in a tubular housing, a displaceably mounted chisel which is guided through a housing tip and which is guided with a collar in a housing bore which has a front and a rear stop which limits the stroke of the chisel, and with an in the working space of the percussion piston protruding.
  • a ram boring machine with a two-part housing ie with a housing tip screwed into the housing receiving the percussion piston
  • the housing tip encloses a chisel which is designed as a striking tip at its front end in the working or impact direction and has a collar and a pin at the other end, the collar being received by a bore in the front housing.
  • the pin represents the impact surface for the associated percussion piston and protrudes in the starting position before the working stroke from a ring screwed into the housing with the housing tip.
  • the ring limits the movement of the collar and thus the chisel against the working direction of the striking tip.
  • ram boring machines are also known in which the housing and the housing tip are in one piece; otherwise there are no significant differences between a two-part and a one-piece device housing.
  • the invention has for its object to design a generic ram boring machine so that in particular the disadvantages mentioned when used in soft soils can be avoided.
  • an inner collar integral with the housing forms the rear stop.
  • the inner collar and the end face of the housing tip screwed into the housing can preferably delimit the housing bore, wherein a compression spring acting on the collar can advantageously be arranged in a recess in the housing tip.
  • the housing bore receiving the chisel collar and at the same time the rear abutment surface of the inner collar can be produced, for example, in a simple manner by turning out the end face of the housing, e.g. the hole can be turned from the full material.
  • the length of the threaded section of the housing tip screwed into the front housing bore is dimensioned such that the distance from the end face of the screwed housing tip to the collar pressed by the compression spring against the rear stop of the inner collar is greater than the protruding length of the pin, without further effort the difference according to the invention between the projection length and the stroke of the chisel collar.
  • the impact energy of the percussion piston is thus transmitted either via the end face of the housing tip or via the inner collar fixed to the housing.
  • a percussion piston 3 which is only shown with its front end, is guided to move back and forth.
  • the percussion piston 3 receives its impact energy by supplying compressed air to the housing 2. Since these are known measures and constructions, the rear part of the housing 2 has not been shown in this respect.
  • the main housing 2 is provided at its front end in the direction of impact 4 with an internal thread 5, into which a housing tip 6 is screwed with a peg-like thread extension 7.
  • a chisel 10 formed at its front end as a striking tip 9 is guided.
  • the striking tip 9 is provided with a step head 11 which is fastened to the chisel 10 by means of pins 12.
  • the pins 12 penetrate a housing bore 13 of the housing tip 6.
  • a collar 14 of the chisel 10 is also arranged in the housing bore 13; the collar 14 touches the rear stop 15 defined by the housing bore 13 in the starting position shown.
  • a pin 16 of the chisel 10 extends through the threaded extension 7 of the housing tip 6 and projects into the working space 17 of the percussion piston 3.
  • the protruding length 18 of the pin 16 is smaller than the maximum stroke 19 of the chisel 10 in the direction of impact 4; the stroke path 19 results from the path that the chisel collar 14 could theoretically cover from the rear stop position shown up to the pins 12 which simultaneously define the front stop 20.
  • the percussion piston 3 hits the end face 21 of the housing tip 6 after a stroke of the chisel 10 corresponding to the protruding length 18, the chisel 10 then no longer moving forward and the collar 14 the pins 12 or can not reach the front stop 20.
  • the housing bore 24 has a front end Section with an internal thread 25 into which a housing tip 106 is screwed with a pin-like thread extension 107.
  • the chisel 110 has a collar 114 and a pin 116 which penetrates the through bore 22 of the inner collar 23 and projects into the working space 117 of the striking piston 103.
  • a compression spring 27 holds the collar 114 in abutment against a rear stop 115 defined by the inner collar 23; the compression spring 27 is in a cylindrical recess 28 of the extension screwed into the housing 102 tion 107 of the housing tip 106 is arranged.
  • the protrusion length 118 ie the extent to which the pin 116 protrudes from the inner collar 23 into the working space 117 of the percussion piston 103, is smaller than the maximum stroke path 119 of the chisel 110. Due to the difference between the protrusion length 118 and the stroke path 119, the percussion piston 103 moving chisel 110 forward in impact direction 104 after a stroke of chisel 110 corresponding to protruding length 118 on inner collar 23, which then offers a flush-fitting striking surface with the end face of pin 116. The impact energy of the impact piston 103 is introduced into the housing 102 via the inner collar 23.
  • the collar 114 has in this case approached the front stop 120 defined by the housing tip 106 in accordance with the dimension of the protruding length 118 of the pin 116; However, the collar 114 cannot reach the front stop 120.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Earth Drilling (AREA)

Abstract

In a boring ram (1) having a percussion piston (3) displaceable in a tubular housing (2), and a displaceably mounted bit (10) which is passed through a housing tip (6), is guided with a collar (14) in a housing bore (13) having a front and a rear stop (20, 15) limiting the stroke (19) of the bit (10), and is provided with a stem (16) projecting into the working space (17) of the percussion piston (3), rebounding blows are avoided when the projecting length (18) of the stem (16) is less than the maximum stroke (19) of the collar (14) between the stops (15, 20). …<IMAGE>…

Description

Die Erfindung betrifft ein Rammbohrgerät mit in einem rohr­förmigen Gehäuse verschiebbaren Schlagkolben, einem ver­schiebbar gelagerten, durch eine Gehäusespitze hindurchge­führten Meißel, der mit einem Bund in einer einen vorderen und einen hinteren, den Hubweg des Meißels begrenzenden Anschlag aufweisenden Gehäusebohrung geführt ist, und mit einem in den Arbeitsraum des Schlagkolbens hineinragenden Zapfen versehen ist.The invention relates to a ram boring machine with an impact piston which can be displaced in a tubular housing, a displaceably mounted chisel which is guided through a housing tip and which is guided with a collar in a housing bore which has a front and a rear stop which limits the stroke of the chisel, and with an in the working space of the percussion piston protruding.

Ein Rammbohrgerät mit einem zweiteiligen Gehäuse, d.h. mit einer in das den Schlagkolben aufnehmende Gehäuse einge­schraubten Gehäusespitze ist aus der DE-PS 21 57 259 be­kannt. Die Gehäusespitze umschließt dort eine an ihrem in Arbeits- bzw. Schlagrichtung vorderen Ende als Schlagspitze ausgebildeten und am anderen Ende einen Bund und einen Zapfen aufweisenden Meißel, wobei der Bund von einer Boh­rung des Vordergehäuses aufgenommen wird. Der Zapfen stellt die Aufschlagfläche für den zugehörigen Schlagkolben dar und ragt in der Ausgangsstellung vor dem Arbeitshub aus einem mit der Gehäusespitze in das Gehäuse eingeschraubten Ring hervor. Der Ring begrenzt die Bewegung des Bundes und damit des Meißels entgegen der Arbeitsrichtung der Schlag­spitze. Die Bewegung des Meißels in Arbeitsrichtung wird durch einen vorderen, von einem Bohrungsabsatz gebildeten Anschlag der den Bund aufnehmenden Bohrung der Gehäuse­spitze begrenzt. Der Meißel stützt sich über den Bund und Druckfedern an der Gehäusespitze ab; die Federn bewegen den Meißel nach jedem Schlag aus seiner in Arbeitsrichtung in der Gehäusespitze vorderen Stellung in seine Ausgangsstel­lung zurück. Neben dem beschriebenen Rammbohrgerät mit dem zweiteiligen Gehäuse sind auch Rammbohrgeräte bekannt, bei denen das Gehäuse und die Gehäusespitze einstückig sind; ansonsten bestehen keine maßgeblichen Unterschiede zwischen einem zweiteiligen und einem einstückigen Gerätegehäuse.A ram boring machine with a two-part housing, ie with a housing tip screwed into the housing receiving the percussion piston, is known from DE-PS 21 57 259. There, the housing tip encloses a chisel which is designed as a striking tip at its front end in the working or impact direction and has a collar and a pin at the other end, the collar being received by a bore in the front housing. The pin represents the impact surface for the associated percussion piston and protrudes in the starting position before the working stroke from a ring screwed into the housing with the housing tip. The ring limits the movement of the collar and thus the chisel against the working direction of the striking tip. The movement of the chisel in the working direction will limited by a front stop, formed by a bore shoulder, of the bore of the housing tip receiving the collar. The chisel is supported on the collar and compression springs at the top of the housing; the springs move the chisel back to its starting position after each stroke from its forward position in the direction of the housing tip. In addition to the described ram boring machine with the two-part housing, ram boring machines are also known in which the housing and the housing tip are in one piece; otherwise there are no significant differences between a two-part and a one-piece device housing.

Es hat sich herausgestellt, daß sich insbesondere dann, wenn die bekannten Geräte in weichen Böden eingesetzt wer­den, Prellschläge nicht ausschließen lassen. Während der Meißel mit seiner Schlagspitze nämlich bei harten Böden nicht so weit aus seiner Ausgangsstellung, gegebenenfalls noch gegen die Kraft einer Feder, nach vorne bewegt wird, daß der Bund auf den die Meißelbewegung begrenzenden Absatz der Gehäusebohrung treffen könnte, bieten hingegen weiche Böden keinen entsprechend großen Widerstand. Der Bund trifft somit auf den durch den Absatz der Gehäusebohrung definierten vorderen Anschlag auf und aufgrund der Schlag­energie des Schlagkolbens entstehen dabei die unerwünschten Prellschläge.It has been found that, particularly when the known devices are used in soft soils, bumps cannot be ruled out. While the chisel with its striking tip is not moved so far out of its initial position, possibly against the force of a spring, that the collar could hit the shoulder of the housing bore that limits the chisel movement, soft floors do not offer a corresponding feature great resistance. The collar thus strikes the front stop defined by the shoulder of the housing bore, and the undesirable bouncing strikes occur due to the impact energy of the impact piston.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsge­mäßes Rammbohrgerät so auszubilden, daß sich insbesondere die beim Einsatz in weichen Böden genannten Nachteile ver­meiden lassen.The invention has for its object to design a generic ram boring machine so that in particular the disadvantages mentioned when used in soft soils can be avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Vorkraglänge des Zapfens kleiner als der maximale Hubweg des Bundes zwischen den Anschlägen ist. Durch die verblüf­fend einfache Maßnahme, die Vorkraglänge des Zapfens klei­ner als den maximalen Hubweg des Bundes bis zu seinem vorderen Anschlag vorzusehen, läßt sich die Betriebsweise des entweder einstückigen oder zweiteiligen Rammbohrgerätes beim Einsatz in weichen Böden verbessern. Nachdem der Mei­ßel nämlich um ein der Vorkraglänge des Zapfens entspre­chendes Maß vorwärtsbewegt wurde, trifft der Schlagkolben bei einem Rammbohrgerät mit einer in das Hauptgehäuse einge­schraubten Gehäusespitze auf die dann völlig geschlossene Stirnfläche der Gehäusespitze, so daß die Schlagenergie großflächig aufgenommen wird; Prellschläge treten nicht mehr auf. Der vordere Anschlag wird vom Schlagkolben näm­lich nicht erreicht, denn der Bund hat sich - ohne daß er allerdings zur Anlage an den vorderen Anschlag gelangen kann - dem Anschlag lediglich um das Maß der Vorkraglänge des Zapfens angenähert.This object is achieved in that the protruding length of the pin is less than the maximum stroke of the federal government between the attacks. The astonishingly simple measure of making the protruding length of the pin smaller than the maximum stroke of the federal government up to its front stop can improve the operation of the one-piece or two-piece ram boring machine when used in soft soils. After the chisel has been moved forward by an amount corresponding to the protruding length of the pin, the percussion piston in a ram boring machine with a housing tip screwed into the main housing hits the then completely closed end face of the housing tip, so that the impact energy is absorbed over a large area; Bumps no longer occur. The front stop is not reached by the percussion piston, because the collar has only approximated the stop by the amount of the protruding length of the pin without it being able to rest against the front stop.

Bei einer Ausgestaltung bildet ein mit dem Gehäuse ein­stückiger Innenkragen den hinteren Anschlag. Indem bei ei­nem aus zwei Gehäuseteilen, d.h. einem Hauptgehäuse und einer Gehäusespitze bestehenden Rammbohrgerät das den Schlagkolben aufnehmende Haupt-Gehäuse mit einem die Aus­gangsstellung des Meißels begrenzenden, einen hinteren An­schlag definierenden Innenkragen als festen Gehäusebestand­teil versehen wird, trifft der Schlagkolben, nachdem der Meißel entsprechend seiner vorkragenden Zapfenlänge vor­wärtsbewegt wurde, voll auf den Innenkragen; die Schlagener­gie wird über den Innenkragen sogleich in das Hauptgehäuse eingeleitet, ohne dabei das Gewinde der ineinandergeschraub­ten Gehäuseteile zu belasten.In one embodiment, an inner collar integral with the housing forms the rear stop. By providing the ram boring main housing for the ram piston with an inner collar defining the starting position of the chisel and defining a rear stop as a fixed housing component in a ram boring machine consisting of two housing parts, i.e. a main housing and a housing tip, the percussion piston hits after the chisel corresponds to it cantilevered pin length has been moved forward, fully on the inner collar; the impact energy is immediately introduced into the main housing via the inner collar, without straining the thread of the screwed housing parts.

Vorzugsweise können der Innenkragen und die Stirnfläche der in das Gehäuse eingeschraubten Gehäusespitze die Gehäu­sebohrung begrenzen, wobei sich vorteilhaft eine den Bund beaufschlagende Druckfeder in einer Ausnehmung der Gehäuse­spitze anordnen läßt. Die den Meißelbund aufnehmende Ge­häusebohrung und gleichzeitig die hintere Anschlagfläche des Innenkragens können beispielsweise auf einfache Weise durch eine Ausdrehung in der Stirnfläche des Gehäuses herge­stellt werden, z.B. kann die Bohrung aus dem vollen Mate­rial gedreht werden. Wenn die Länge des in die stirnseitige Gehäusebohrung eingeschraubten Gewindeabschnitts der Gehäu­sespitze so bemessen ist, daß der Abstand von der Stirn­fläche der eingeschraubten Gehäusespitze bis zu dem von der Druckfeder gegen den hinteren Anschlag des Innenkragens gedrückten Bundes größer als die Vorkraglänge des Zapfens ist, ergibt sich ohne weiteren Aufwand der erfindungsgemäße Unterschied zwischen der Vorkraglänge und dem Hubweg des Meißelbundes. Beim Einsatz des Rammbohrgerätes in weichen Böden wird die Schlagenergie des Schlagkolbens somit entwe­der über die Stirnfläche der Gehäusespitze oder über den gehäusefesten Innenkragen weitergeleitet.The inner collar and the end face of the housing tip screwed into the housing can preferably delimit the housing bore, wherein a compression spring acting on the collar can advantageously be arranged in a recess in the housing tip. The housing bore receiving the chisel collar and at the same time the rear abutment surface of the inner collar can be produced, for example, in a simple manner by turning out the end face of the housing, e.g. the hole can be turned from the full material. If the length of the threaded section of the housing tip screwed into the front housing bore is dimensioned such that the distance from the end face of the screwed housing tip to the collar pressed by the compression spring against the rear stop of the inner collar is greater than the protruding length of the pin, without further effort the difference according to the invention between the projection length and the stroke of the chisel collar. When the ram boring machine is used in soft soils, the impact energy of the percussion piston is thus transmitted either via the end face of the housing tip or via the inner collar fixed to the housing.

Die Erfindung wird anhand der in der Zeichnung dargestell­ten Ausführungsbeispiele des näheren erläutert. Es zeigen:

  • Fig. 1 im Längsschnitt den vorderen Teil einer ersten Ausführung eines erfindungsgemäßen Rammbohrgerä­tes; und
  • Fig. 2 im Längsschnitt den vorderen Teil einer zweiten Ausführung eines Rammbohrgerätes gemäß der Erfin­dung.
The invention is explained in more detail with reference to the exemplary embodiments shown in the drawing. Show it:
  • Figure 1 in longitudinal section the front part of a first embodiment of a ram boring machine according to the invention. and
  • Fig. 2 in longitudinal section the front part of a second embodiment of a ram boring machine according to the invention.

Von einem Rammbohrgerät 1 ist lediglich der vordere Teil eines insgesamt rohrförmigen Gehäuses 2 dargestellt. Im Gehäuse 2 ist ein nur mit seinem vorderen Ende dargestell­ter Schlagkolben 3 hin- und hergehend beweglich geführt. Der Schlagkolben 3 erhält seine Schlagenergie durch Zufuhr von Druckluft zum Gehäuse 2. Da es sich hierbei um bekannte Maßnahmen und Konstruktionen handelt, ist insoweit auf die Darstellung des hinteren Teils des Gehäuses 2 verzichtet worden.Of a ram boring machine 1, only the front part of an overall tubular housing 2 is shown. In the housing 2, a percussion piston 3, which is only shown with its front end, is guided to move back and forth. The percussion piston 3 receives its impact energy by supplying compressed air to the housing 2. Since these are known measures and constructions, the rear part of the housing 2 has not been shown in this respect.

Bei dem Rammbohrgerät 1 ist das Hauptgehäuse 2 an seinem in Schlagrichtung 4 vorderen Ende mit einem Innengewinde 5 versehen, in das eine Gehäusespitze 6 mit einer zapfenarti­gen Gewindeverlängerung 7 eingeschraubt ist. In einer Axial­bohrung 8 der Gehäusespitze 6 ist ein an seinem vorderen Ende als Schlagspitze 9 ausgebildeter Meißel 10 geführt. Die Schlagspitze 9 ist mit einem Stufenkopf 11 versehen, der mittels Stiften 12 am Meißel 10 befestigt ist. Die Stifte 12 durchdringen dabei eine Gehäusebohrung 13 der Gehäusespitze 6.In the ram boring machine 1, the main housing 2 is provided at its front end in the direction of impact 4 with an internal thread 5, into which a housing tip 6 is screwed with a peg-like thread extension 7. In an axial bore 8 of the housing tip 6, a chisel 10 formed at its front end as a striking tip 9 is guided. The striking tip 9 is provided with a step head 11 which is fastened to the chisel 10 by means of pins 12. The pins 12 penetrate a housing bore 13 of the housing tip 6.

In der Gehäusebohrung 13 ist außerdem ein Bund 14 des Meißels 10 angeordnet; der Bund 14 berührt in der darge­stellten Ausgangslage den von der Gehäusebohrung 13 defi­nierten hinteren Anschlag 15. Ein Zapfen 16 des Meißels 10 erstreckt sich durch die Gewindeverlängerung 7 der Gehäuse­spitze 6 und ragt in den Arbeitsraum 17 des Schlagkolbens 3 hinein. Die Vorkraglänge 18 des Zapfens 16 ist kleiner als der maximale Hubweg 19 des Meißels 10 in Schlagrichtung 4; der Hubweg 19 ergibt sich aus dem Weg, den der Meißelbund 14 aus der dargestellten hinteren Anschlaglage bis zu den gleichzeitig den vorderen Anschlag 20 definierenden Stiften 12 theoretisch zurücklegen könnte. Da jedoch die Vorkrag­ länge 18 kleiner als der Hubweg 19 ist, trifft der Schlag­kolben 3 nach einem der Vorkraglänge 18 entsprechenden Hub des Meißels 10 voll auf die Stirnfläche 21 der Gehäusespit­ze 6, wobei sich der Meißel 10 dann nicht mehr weiter vorwärts bewegen und der Bund 14 die Stifte 12 bzw. den vorderen Anschlag 20 nicht erreichen kann.A collar 14 of the chisel 10 is also arranged in the housing bore 13; the collar 14 touches the rear stop 15 defined by the housing bore 13 in the starting position shown. A pin 16 of the chisel 10 extends through the threaded extension 7 of the housing tip 6 and projects into the working space 17 of the percussion piston 3. The protruding length 18 of the pin 16 is smaller than the maximum stroke 19 of the chisel 10 in the direction of impact 4; the stroke path 19 results from the path that the chisel collar 14 could theoretically cover from the rear stop position shown up to the pins 12 which simultaneously define the front stop 20. However, as the protrusion length 18 is smaller than the stroke 19, the percussion piston 3 hits the end face 21 of the housing tip 6 after a stroke of the chisel 10 corresponding to the protruding length 18, the chisel 10 then no longer moving forward and the collar 14 the pins 12 or can not reach the front stop 20.

Wie in Fig. 2 dargestellt ist, trennt ein mit dem Gehäuse 102 einstückiger, mit einer axialen Durchgangsbohrung 22 versehener Innenkragen 23 einen Arbeitsraum 117 des Schlag­kolbens 103 von einer in Arbeits- bzw. Schlagrichtung 104 stirnseitig offenen Gehäusebohrung 24. Die Gehäusebohrung 24 weist einen vorderen Abschnitt mit einem Innengewinde 25 auf, in das eine Gehäusespitze 106 mit einer zapfenartigen Gewindeverlängerung 107 eingeschraubt ist. In einer Axial­bohrung 108 der Gehäusespitze 106 ist ein an seinem vorde­ren Ende als Schlagspitze 109 ausgebildeter Meißel 110 geführt. Ein am Meißel 110 in Schlagrichtung 104 hinter der Schlagspitze 109 mittels Stiften 112 befestigter Stufenkopf 111 umschließt mit einem Ringkragen 26 die Gehäusespitze 106; der Stufenkopf 111 verschiebt sich relativ gegenüber der Gehäusespitze 106, wobei er mit der Krageninnenfläche auf der Gehäusespitze 106 gleitet.As shown in FIG. 2, an inner collar 23, which is integral with the housing 102 and has an axial through-bore 22, separates a working space 117 of the percussion piston 103 from a housing bore 24 that is open at the end in the working or impact direction 104. The housing bore 24 has a front end Section with an internal thread 25 into which a housing tip 106 is screwed with a pin-like thread extension 107. A chisel 110, which is designed as a striking tip 109 at its front end, is guided in an axial bore 108 of the housing tip 106. A step head 111 fastened to the chisel 110 in the direction of impact 104 behind the impact tip 109 by means of pins 112 encloses the housing tip 106 with an annular collar 26; the stepped head 111 shifts relative to the housing tip 106, sliding with the inner surface of the collar on the housing tip 106.

An dem der Schlagspitze 109 abgewandten Ende weist der Meißel 110 einen Bund 114 und einen die Durchgangsbohrung 22 des Innenkragens 23 durchdringenden, bis in den Arbeits­raum 117 des Schlagkolbens 103 vorkragenden Zapfen 116 auf. In der dargestellten Ausgangslage bzw. Endstellung vor dem Arbeitshub hält eine Druckfeder 27 den Bund 114 in Anlage gegen einen von dem Innenkragen 23 definierten, hinteren Anschlag 115; die Druckfeder 27 ist in einer zylindrischen Ausnehmung 28 der in das Gehäuse 102 eingeschraubten Verlän­ gerung 107 der Gehäusespitze 106 angeordnet. Die Vorkraglän­ge 118, d.h. das Maß, mit dem der Zapfen 116 aus dem Innenkragen 23 in den Arbeitsraum 117 des Schlagkolbens 103 hineinragt, ist kleiner als der maximale Hubweg 119 des Meißels 110. Aufgrund der Differenz zwischen der Vorkraglän­ge 118 und dem Hubweg 119 trifft der den Meißel 110 in Schlagrichtung 104 vorwärtsbewegende Schlagkolben 103 nach einem der Vorkraglänge 118 entsprechenden Hub des Meißels 110 auf den Innenkragen 23, der dann mit der Stirnfläche des Zapfens 116 eine bündig abschließende Schlagfläche bie­tet. Die Schlagenergie des Schlagkolbens 103 wird über den Innenkragen 23 in das Gehäuse 102 eingeleitet. Der Bund 114 hat sich dabei dem durch die Gehäusespitze 106 definierten vorderen Anschlag 120 zwar entsprechend dem Maß der Vorkrag­länge 118 des Zapfens 116 angenähert; erreichen kann der Bund 114 den vorderen Anschlag 120 allerdings nicht.At the end facing away from the striking tip 109, the chisel 110 has a collar 114 and a pin 116 which penetrates the through bore 22 of the inner collar 23 and projects into the working space 117 of the striking piston 103. In the illustrated starting position or end position before the working stroke, a compression spring 27 holds the collar 114 in abutment against a rear stop 115 defined by the inner collar 23; the compression spring 27 is in a cylindrical recess 28 of the extension screwed into the housing 102 tion 107 of the housing tip 106 is arranged. The protrusion length 118, ie the extent to which the pin 116 protrudes from the inner collar 23 into the working space 117 of the percussion piston 103, is smaller than the maximum stroke path 119 of the chisel 110. Due to the difference between the protrusion length 118 and the stroke path 119, the percussion piston 103 moving chisel 110 forward in impact direction 104 after a stroke of chisel 110 corresponding to protruding length 118 on inner collar 23, which then offers a flush-fitting striking surface with the end face of pin 116. The impact energy of the impact piston 103 is introduced into the housing 102 via the inner collar 23. The collar 114 has in this case approached the front stop 120 defined by the housing tip 106 in accordance with the dimension of the protruding length 118 of the pin 116; However, the collar 114 cannot reach the front stop 120.

Claims (4)

1. Rammbohrgerät mit in einem rohrförmigen Gehäuse ver­schiebbaren Schlagkolben, einem verschiebbaren, durch eine Gehäusespitze hindurchgeführten Meißel, der mit einem Bund in einer einen vorderen und einen hinteren, den Hubweg des Meißels begrenzenden Anschlag aufweisen­den Gehäusebohrung geführt und mit einem in den Ar­beitsraum des Schlagkolbens hineinragenden Zapfen ver­sehen ist, dadurch gekennzeichnet, daß die Vorkraglän­ge (18, 118) des Zapfens (16, 116) kleiner als der maximale Hubweg (19, 119) des Bundes (14, 114) zwi­schen den Anschlägen (15, 20; 115, 120) ist.1. ram boring machine with an impact piston which can be displaced in a tubular housing, a displaceable chisel which is guided through a housing tip and which is guided with a collar in a housing bore which has a front and a rear stop which limits the stroke of the chisel and which projects into the working space of the impact piston Pin is provided, characterized in that the protruding length (18, 118) of the pin (16, 116) is less than the maximum stroke (19, 119) of the collar (14, 114) between the stops (15, 20; 115, 120 ) is. 2. Rammbohrgerät nach Anspruch 1, dadurch gekennzeichnet, daß ein mit dem Gehäuse (2, 102) einstückiger Innenkra­gen (23) den hinteren Anschlag (115) bildet.2. A ram boring machine according to claim 1, characterized in that a one-piece inner collar (23) with the housing (2, 102) forms the rear stop (115). 3. Rammbohrgerät nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der Innenkragen (23) und die Stirnfläche (120) einer in das Gehäuse (2, 102) eingeschraubten Gehäusespitze (106, 107) die Gehäusebohrung (24) be­grenzen.3. A ram boring machine according to claim 1 or 2, characterized in that the inner collar (23) and the end face (120) of a housing tip (106, 107) screwed into the housing (2, 102) limit the housing bore (24). 4. Rammbohrgerät nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß eine Druckfeder (27) in einer Ausnehmung (28) der Gehäusespitze (106, 107) angeordnet ist.4. A ram boring machine according to one or more of claims 1 to 3, characterized in that a compression spring (27) is arranged in a recess (28) in the housing tip (106, 107).
EP89107906A 1988-07-29 1989-05-02 Boring ram Expired - Lifetime EP0353400B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3825800 1988-07-29
DE3825800A DE3825800A1 (en) 1988-07-29 1988-07-29 RAMM DRILLING DEVICE

Publications (3)

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EP0353400A2 true EP0353400A2 (en) 1990-02-07
EP0353400A3 EP0353400A3 (en) 1991-02-06
EP0353400B1 EP0353400B1 (en) 1994-03-16

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ID=6359839

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EP89107906A Expired - Lifetime EP0353400B1 (en) 1988-07-29 1989-05-02 Boring ram

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US (1) US5095998A (en)
EP (1) EP0353400B1 (en)
JP (1) JP2693234B2 (en)
DE (1) DE3825800A1 (en)

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WO1997002386A1 (en) * 1995-07-06 1997-01-23 Komatsu Ltd. Hydraulic roller-compactor
CA2194079C (en) * 1996-12-19 2005-11-29 Murray P. Craigmile Methods and apparatus for directionally drilling a bore and placing pipe
US5896934A (en) * 1997-09-08 1999-04-27 Chicago Pneumatic Tool Company Reciprocating tool having a piston retainer
KR20010037319A (en) * 1999-10-15 2001-05-07 양재신 Tool holder for breaker
KR20010037320A (en) * 1999-10-15 2001-05-07 양재신 Tool holder for breaker
US6273201B1 (en) * 2000-02-16 2001-08-14 Earth Tool Company, L.L.C. Pneumatic ground piercing tool with movable chisel head
US7066279B2 (en) * 2004-11-08 2006-06-27 Earth Tool Company, L.L.C. Pneumatic ground piercing tool
CA2665298C (en) * 2008-05-03 2016-03-01 Earth Tool Company, Llc Pneumatic impact tool
JP5858259B2 (en) * 2014-07-24 2016-02-10 株式会社全晴 AIR HAMMER TOOL, AND METHOD OF ADJUSTING STRONG FORCE OF AIR HAMMER TOOL
US10641051B1 (en) * 2016-09-07 2020-05-05 Dandelion Energy, Inc. Systems and methods for coupling and decoupling drill heads for ground loop preparation for geothermal applications

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US1481641A (en) * 1920-11-09 1924-01-22 Ingersoll Rand Co Tie-tamper front-end construction
US1525471A (en) * 1921-07-25 1925-02-10 Chicago Pneumatic Tool Co Coupling for percussive tools
US2181381A (en) * 1937-07-26 1939-11-28 John J Roberts Internally cushioned tool-and-chuck lock for power hammers
US2889811A (en) * 1956-08-10 1959-06-09 Electro Chimie Metal Percussion tools
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FR2223143A1 (en) * 1973-03-30 1974-10-25 Favre Jacques Guide for tools or bits in pneumatic hammers - has conventional barrel extended as slide fit over flanged tool shaft
DE2537176B1 (en) * 1975-08-21 1976-12-09 Jenne & Strahm Ag Reciprocating impact ram control - by axial and turning of control sleeve for compressed air supply to piston
DE3124524A1 (en) * 1981-06-23 1983-01-13 Gustav Dr.-Ing. 4300 Essen Jenne RAMM HEAD FOR SELF-DRIVEN PNEUMATIC RAMM DRILLING DEVICES
EP0283734A2 (en) * 1987-03-27 1988-09-28 Helmuth Römer Percussive drilling apparatus with movable hammer head

Also Published As

Publication number Publication date
JPH0247492A (en) 1990-02-16
US5095998A (en) 1992-03-17
DE3825800C2 (en) 1991-08-29
JP2693234B2 (en) 1997-12-24
EP0353400B1 (en) 1994-03-16
DE3825800A1 (en) 1990-02-01
EP0353400A3 (en) 1991-02-06

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