EP0240012B1 - Power wrench - Google Patents

Power wrench Download PDF

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Publication number
EP0240012B1
EP0240012B1 EP87104858A EP87104858A EP0240012B1 EP 0240012 B1 EP0240012 B1 EP 0240012B1 EP 87104858 A EP87104858 A EP 87104858A EP 87104858 A EP87104858 A EP 87104858A EP 0240012 B1 EP0240012 B1 EP 0240012B1
Authority
EP
European Patent Office
Prior art keywords
tensioning
tensioning wheel
tensioning lever
lever
pivot axis
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.)
Expired - Lifetime
Application number
EP87104858A
Other languages
German (de)
French (fr)
Other versions
EP0240012A1 (en
Inventor
Gustav Frohn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enerpac Tool Group Corp
Original Assignee
Applied Power Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Applied Power Inc filed Critical Applied Power Inc
Publication of EP0240012A1 publication Critical patent/EP0240012A1/en
Application granted granted Critical
Publication of EP0240012B1 publication Critical patent/EP0240012B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B25B21/005—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type driven by a radially acting hydraulic or pneumatic piston

Definitions

  • the invention relates to a generic power wrench (see e.g. EP-A-0 163 009).
  • the tensioning wheel is kept the same size over the entire length of its axis, insofar as it lies within the tensioning lever.
  • the tensioning wheel can therefore be displaced in the axial direction in the opening provided for its reception within the tensioning lever.
  • Such displaceability makes special precautions or precautions necessary during assembly prior to the application of the housing parts that laterally cover the tensioning lever in order to prevent the tensioning wheel and its drive parts from slipping out of the tensioning lever.
  • the invention is therefore based on the object of designing a power wrench of the type mentioned at the outset in such a way that the tensioning wheel can find sufficient hold against axial displacement to at least one side within the tensioning lever even without support from lateral housing parts.
  • the tensioning wheel can be held laterally during assembly within the tensioning lever, so that special precautions or handling measures for securing the tensioning wheel can be dispensed with during assembly.
  • a large extent of the tensioning wheel is available for the formation of the external toothing, and an additional safeguard against tilting of the tensioning wheel in the tensioning lever is created during the screwing process in later operation.
  • the power wrench shown in Fig. 1 has a housing 1, in which a working piston 5 is guided in a longitudinally displaceable manner in an axial bore, which can be acted upon by a hydraulic connection 16 with driving force, and then undergoes an adjustment to the right. With this adjustment, the working piston 5 acts on the head of a tensioning lever 4 which is held in the housing 1 so as to be pivotable about an axis of rotation 11 which, in practical use of the power screwdriver, coincides with the central axis of a screw or nut to be tightened or loosened. They are limited by the pivoting movement of the tensioning lever 4 triggered by this adjustment of the working piston 5 by means of a stop piece 7 adjoining the cylinder part of the housing 1.
  • a support leg 10 is connected to the housing 1 below the axial bore for the working piston 5 via a receptacle provided there, which can be adjusted within its receptacle.
  • a tensioning wheel 8 is mounted with the axis of rotation 11 as a separate axis, which follows the pivoting of the tensioning lever 4 by the working piston 5 with a corresponding own rotational movement about the axis of rotation 11, during the return movement of the tensioning lever 4 under the action of returning piston 13 and return spring 31, however, stops.
  • connection between the tensioning wheel 8 and the tensioning lever 4 takes place via a drive pawl 9, which engages in a circumferential toothing on the tensioning wheel 8 during the pivoting of the tensioning lever 4 by the working piston 5 under the action of a compression spring 32 with an external toothing along its lower arc, during the pivoting back of the tensioning lever 4, however, slides over the tensioning wheel 8 in the manner of a ratchet.
  • the tensioning wheel 8 contains a square hole 6, which serves as a connection to the screw or nut to be tightened or loosened, this connection either being possible directly via the square hole 6 itself or with the interposition of a socket.
  • the tensioning wheel 8 is stepped in diameter along the partial area of its axis lying within the tensioning lever 4, whereby the transition point between the two tensioning wheel diameters results in an annular shoulder 14 which bears against an adjacent side cheek 15 within the tensioning lever 4.
  • the tensioning wheel 8 is thus asymmetrical over its length in cross section, and it continues with the smaller diameter beyond the tensioning lever 4 in the two adjoining lateral bearing shells 2 and 3.
  • the external toothing for cooperation with the drive pawl 9 is arranged on the circumferential area with the larger diameter of the tensioning wheel 8, as can be clearly seen in the illustration in FIG. 3.
  • the tensioning wheel 8 Due to the contact of the annular shoulder 14 of the tensioning wheel 8 on the side cheek 15 in the tensioning lever 4, the tensioning wheel 8 receives lateral support from its first insertion into the tensioning lever 4. The final securing of the position is obtained by attaching the bearing shell 3 on the right side of the tensioning lever 4. When the tensioning wheel 8 is replaced later, only this bearing shell 3 needs to be removed, while the bearing shell 2 on the left side of the tensioning lever 4 is in place can remain. When the power wrench is ready for operation, the tensioning wheel 8 is mounted twice in the tensioning lever 4 and additionally in each of the two bearing shells 2 and 3.
  • a tensioning lever can be pivoted in a housing driven by a piston, which in turn pivots a tensioning wheel in a pivoting direction via a spring-loaded drive pawl, which serves to transmit the tensioning force to a screw or nut to be tightened or loosened.
  • the tensioning wheel has an asymmetrical cross section and is stepped in diameter along its axis, with an annular shoulder at the transition point, which rests on a stringer cheek in the tensioning lever and finds lateral support.
  • the tensioning wheel with the smaller diameter continues in bearing shells lying on both sides of the tensioning lever, resulting in a bearing point in each of the two bearing shells in addition to the double mounting of the tensioning wheel in the tensioning lever.
  • the interlocking for interaction with the Drive pawl is arranged on the circumference of the tensioning wheel in the area of its larger diameter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Description

Die Erfindung betrifft einen gattungsgemäßen Kraftschrauber (siche z.B. EP-A-0 163 009).The invention relates to a generic power wrench (see e.g. EP-A-0 163 009).

Bei bekannten Kraftschraubern dieser Art ist das Spannrad über die gesamte Länge seiner Achse, soweit diese innerhalb des Spannhebels liegt, gleich groß gehalten. Das Spannrad läßt sich daher in der für seine Aufnahme vorgesehenen Öffnung innerhalb des Spannhebels in axialer Richtung beliebig verschieben. Eine derartige Verschiebbarkeit macht jedoch während der Montage vor dem Aufbringen der den Spannhebel seitlich abdeckenden Gehäuseteile besondere Vorkehrungen bzw. Vorsichtsmaßnahmen erforderlich, um ein ungewolltes Herausrutschen des Spannrades und seiner Antriebsteile aus dem Spannhebel zu verhindern.In known power screwdrivers of this type, the tensioning wheel is kept the same size over the entire length of its axis, insofar as it lies within the tensioning lever. The tensioning wheel can therefore be displaced in the axial direction in the opening provided for its reception within the tensioning lever. Such displaceability, however, makes special precautions or precautions necessary during assembly prior to the application of the housing parts that laterally cover the tensioning lever in order to prevent the tensioning wheel and its drive parts from slipping out of the tensioning lever.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Kraftschrauber der eingangs erwähnten Art so auszubilden, daß das Spannrad innerhalb des Spannhebels auch ohne Abstützung durch seitliche Gehäuseteile ausreichenden Halt gegenüber einer Axialverschiebung nach wenigstens einer Seite finden kann.The invention is therefore based on the object of designing a power wrench of the type mentioned at the outset in such a way that the tensioning wheel can find sufficient hold against axial displacement to at least one side within the tensioning lever even without support from lateral housing parts.

Die gestellte Aufgabe wird gemäß der Erfindung gelöst durch einen Kraftschrauber, wie er im Patentanspruch 1 gekennzeichnet ist; vorteilhafte Ausgestaltung und Weiterbildung der Erfindung ergibt sich aus dem Unteranspruch.The object is achieved according to the invention by a power wrench as characterized in claim 1; advantageous embodiment and development of the invention results from the subclaim.

Dank der erfindungsgemäßen Ausbildung kann das Spannrad während der Montage innerhalb des Spannhebels seitlichen Halt finden, so daß auf besondere Vorkehrungen oder Handhabungsmaßnahmen zur Sicherung des Spannrades während des Zusammenbaus verzichtet werden kann. Gleichzeitig steht ein großer Umfang des Spannrades für die Ausbildung der Außenverzahnung zur Verfügung, und außerdem wird eine zusätzliche Sicherung gegen ein Verkanten des Spannrades im Spannhebel während des Schraubvorganges im späteren Betrieb geschaffen.Thanks to the design according to the invention, the tensioning wheel can be held laterally during assembly within the tensioning lever, so that special precautions or handling measures for securing the tensioning wheel can be dispensed with during assembly. At the same time, a large extent of the tensioning wheel is available for the formation of the external toothing, and an additional safeguard against tilting of the tensioning wheel in the tensioning lever is created during the screwing process in later operation.

Für die weitere Erläuterung der Erfindung und ihrer Vorteile wird nunmehr auf die Zeichnung Bezug genommen, in der ein bevorzugtes Ausführungsbeispiel für die Erfindung veranschaulicht ist; im einzelnen zeigen in der Zeichnung:

Fig. 1
einen Längsschnitt durch einen Kraftschrauber gemäß der Erfindung,
Fig. 2
einen zu der Darstellung von Fig. 1 senkrechten Schnitt durch den Kraftschrauber von Fig. 1 entlang der die gemeinsame Schwenk- bzw. Drehachse für Spannhebel und Spannrad enthaltenden Vertikalebene
und
Fig. 3
eine Einzelheit der Darstellung von Fig. 2 in größerem Maßstab.
For the further explanation of the invention and its advantages, reference is now made to the drawing, in which a preferred exemplary embodiment of the invention is illustrated; show in detail in the drawing:
Fig. 1
2 shows a longitudinal section through a power wrench according to the invention,
Fig. 2
a section perpendicular to the representation of FIG. 1 through the power wrench of FIG. 1 along the vertical plane containing the common pivot or rotation axis for the tensioning lever and tensioning wheel
and
Fig. 3
a detail of the representation of Fig. 2 on a larger scale.

Der in Fig. 1 gezeigte Kraftschrauber besitzt ein Gehäuse 1, in dem in einer Axialbohrung ein Arbeitskolben 5 längsverschieblich geführt ist, der über einen Hydraulikanschluß 16 mit Antriebskraft beaufschlagt werden kann, und dann eine Verstellung nach rechts erfährt. Bei dieser Verstellung wirkt der Arbeitskolben 5 auf den Kopf eines Spannhebels 4, der im Gehäuse 1 um eine Drehachse 11 schwenkbar gehalten ist, die im praktischen Einsatz des Kraftschraubers mit der Mittelachse einer anzuziehenden oder zu lösenden Schraube oder Mutter zusammenfällt. Ihre Begrenzung findet die durch diese Verstellung des Arbeitskolbens 5 ausgelöste Schwenkbewegung des Spannhebels 4 durch ein an den Zylinderteil des Gehäuses 1 anschließendes Anschlagstück 7. Den Abschluß des Gehäuses 1 nach außen bilden im Bereich des Spannhebels 4 ein in Fig. 1 sichtbares unteres Abdeckblech 12 und zwei seitliche Lagerschalen 2 und 3, die aus der Darstellung in Fig. 2 ersichtlich sind. In dem Anschlagstück 7 ist ein Rückstellkolben 13 gehalten, der die gleiche Wirkachse hat wie der Arbeitskolben 5 und diesem unter Beaufschlagung durch eine Rückstellfeder 31 engegegenwirkt, also nach der Entlastung des Arbeitskolbens 5 vom Hydraulikdruck die Rückverschwenkung des Spannhebels 4 um die Drehachse 11 nach links herbeiführt. Zur Ableitung des sich während des Schraubvorganges aus der Verschwenkung des Spannhebels 4 ergebenden Gegenmoments auf ein äußeres Widerlager ist mit dem Gehäuse 1 unterhalb der Axialbohrung für den Arbeitskolben 5 über eine dort vorgesehene Aufnahme ein Stützfuß 10 verbunden, der sich innerhalb seiner Aufnahme verstellen läßt.The power wrench shown in Fig. 1 has a housing 1, in which a working piston 5 is guided in a longitudinally displaceable manner in an axial bore, which can be acted upon by a hydraulic connection 16 with driving force, and then undergoes an adjustment to the right. With this adjustment, the working piston 5 acts on the head of a tensioning lever 4 which is held in the housing 1 so as to be pivotable about an axis of rotation 11 which, in practical use of the power screwdriver, coincides with the central axis of a screw or nut to be tightened or loosened. They are limited by the pivoting movement of the tensioning lever 4 triggered by this adjustment of the working piston 5 by means of a stop piece 7 adjoining the cylinder part of the housing 1. The closure of the housing 1 to the outside form in the region of the tensioning lever 4 a lower cover plate 12 visible in FIG. 1 and two lateral bearing shells 2 and 3, which can be seen from the illustration in FIG. 2. In the stop piece 7, a return piston 13 is held, which has the same active axis as the working piston 5 and counteracts this under the action of a return spring 31, i.e. after the working piston 5 is relieved of the hydraulic pressure, the pivoting back of the tensioning lever 4 about the axis of rotation 11 to the left . In order to derive the counter torque resulting from the pivoting of the tensioning lever 4 during the screwing process onto an external abutment, a support leg 10 is connected to the housing 1 below the axial bore for the working piston 5 via a receptacle provided there, which can be adjusted within its receptacle.

Innerhalb des Spannhebels 4 ist mit der Drehachse 11 als eigener Achse ein Spannrad 8 gelagert, das der Verschwenkung des Spannhebels 4 durch den Arbeitskolben 5 mit einer entsprechenden eigenen Drehbewegung um die Drehachse 11 folgt, während der Rückstellbewegung des Spannhebels⁴unter der Einwirkung von Rückstellkolben 13 und Rückstellfeder 31 jedoch stehenbleibt. Die Verbindung zwischen Spannrad 8 und Spannhebel 4 erfolgt dabei über eine Antriebsklinke 9, die während der Arbeitsverschwenkung des Spannhebels 4 durch den Arbeitskolben 5 unter der Einwirkung einer Druckfeder 32 mit einer Außenverzahnung entlang ihres unteren Bogens in eine Umfangsverzahnung am Spannrad 8 eingreift, während der Rückverschwenkung des Spannhebels 4 jedoch nach Art einer Ratsche über des Spannrad 8 hinweggleitet. In seinem Zentrum enthält des Spannrad 8 ein Vierkantloch 6, das als Verbindung zu der anzuziehenden oder zu lösenden Schraube oder Mutter dient, wobei diese Verbindung entweder unmittelbar über das Vierkantloch 6 selbst oder aber unter Zwischenschaltung einer Stecknuß erfolgen kann.Within the tensioning lever 4, a tensioning wheel 8 is mounted with the axis of rotation 11 as a separate axis, which follows the pivoting of the tensioning lever 4 by the working piston 5 with a corresponding own rotational movement about the axis of rotation 11, during the return movement of the tensioning lever ⁴ under the action of returning piston 13 and return spring 31, however, stops. The connection between the tensioning wheel 8 and the tensioning lever 4 takes place via a drive pawl 9, which engages in a circumferential toothing on the tensioning wheel 8 during the pivoting of the tensioning lever 4 by the working piston 5 under the action of a compression spring 32 with an external toothing along its lower arc, during the pivoting back of the tensioning lever 4, however, slides over the tensioning wheel 8 in the manner of a ratchet. At its center, the tensioning wheel 8 contains a square hole 6, which serves as a connection to the screw or nut to be tightened or loosened, this connection either being possible directly via the square hole 6 itself or with the interposition of a socket.

Wie die Darstellung in Fig. 2 und insbesondere in Fig. 3 zeigen, ist das Spannrad 8 entlang des innerhalb des Spannhebels 4 liegenden Teilbereichs seiner Achse in Durchmesser abgestuft, wobei sich an der Übergangsstelle zwischen den beiden Spannraddurchmessern eine Ringschulter 14 ergibt, die an einer benachbarten Seitenwange 15 innerhalb des Spannhebels 4 anliegt. Das Spannrad 8 ist also über seine Länge im Querschnitt unsymmetrisch ausgebildet, und es setzt sich mit dem kleineren Durchmesser über den Spannhebel 4 hinaus in den beiden anschließenden seitlichen Lagerschalen 2 und 3 fort. Die Außenverzahnung für das Zusammenwirken mit der Antriebsklinke 9 ist auf dem Umfangsbereich mit dem größeren Durchmesser des Spannrades 8 angeordnet, wie die Darstellung in Fig. 3 deutlich erkennen läßt. Durch die Anlage der Ringschulter 14 des Spannrads 8 an der Seitenwange 15 im Spannhebel 4 erhält das Spannrad 8 von seinem ersten Einsetzen in den Spannhebel 4 an Halt in seitlicher Richtung. Die endgültige Lagesicherung ergibt sich mit der Anbringung der Lagerschale 3 auf der rechten Seite des Spannhebels 4. Bei einem späteren Austausch des Spannrades 8 braucht auch nur diese Lagerschale 3 abgenommen zu werden, während die Lagerschale 2 auf der linken Seite des Spannhebels 4 an ihrem Platz verbleiben kann. Im betriebsfertigen Zustand des Kraftschraubers ist das Spannrad 8 im Spannhebel 4 zweifach und zusätzlich noch in jeder der beiden Lagerschalen 2 und 3 gelagert.As the illustration in FIG. 2 and in particular in FIG. 3 show, the tensioning wheel 8 is stepped in diameter along the partial area of its axis lying within the tensioning lever 4, whereby the transition point between the two tensioning wheel diameters results in an annular shoulder 14 which bears against an adjacent side cheek 15 within the tensioning lever 4. The tensioning wheel 8 is thus asymmetrical over its length in cross section, and it continues with the smaller diameter beyond the tensioning lever 4 in the two adjoining lateral bearing shells 2 and 3. The external toothing for cooperation with the drive pawl 9 is arranged on the circumferential area with the larger diameter of the tensioning wheel 8, as can be clearly seen in the illustration in FIG. 3. Due to the contact of the annular shoulder 14 of the tensioning wheel 8 on the side cheek 15 in the tensioning lever 4, the tensioning wheel 8 receives lateral support from its first insertion into the tensioning lever 4. The final securing of the position is obtained by attaching the bearing shell 3 on the right side of the tensioning lever 4. When the tensioning wheel 8 is replaced later, only this bearing shell 3 needs to be removed, while the bearing shell 2 on the left side of the tensioning lever 4 is in place can remain. When the power wrench is ready for operation, the tensioning wheel 8 is mounted twice in the tensioning lever 4 and additionally in each of the two bearing shells 2 and 3.

Bei einem erfindungsgemäßen Vorrichtung ist in einem Gehäuse unter Antrieb durch einen Kolben ein Spannhebel verschwenkbar, der seinerseits in einer Schwenkrichtung über eine federbelastete Antriebsklinke ein Spannrad mitnimmt, das zur Übertragung der Spannkraft auf eine anzuziehende oder zu lösende Schraube oder Mutter dient. Zur Vereinfachung der Montage ist das Spannrad im Querschnitt unsymmetrisch ausgebildet und entlang seiner Achse im Durchmesser abgestuft, wobei sich an der Übergangsstelle eine Ringschulter ergibt, die an einer Sietenwange im Spannhebel anliegt und seitlichen Halt findet. Beiderseits des Spannhebels setzt sich das Spannrad mit dem kleineren Durchmesser in zu beiden Seiten des Spannhebels daran anliegenden Lagerschalen fort, womit sich zusätzlich zu der zweifachen Lagerung des Spannrades im Spannhebel je eine Lagerstelle in jeder der beiden lagerschalen ergibt. Die Verzahnung für das Zusammenwirken mit der Antriebsklinke ist auf dem Umfang des Spannrades im Bereich von dessen größeren Durchmesser angeordnet. Im Ergebnis führt die Erfindung zu einer montageleichten und betriebszuverlässigen Ausführung für einen Kraftschrauber mit hydraulischem oder pneumatischem Antrieb.In a device according to the invention, a tensioning lever can be pivoted in a housing driven by a piston, which in turn pivots a tensioning wheel in a pivoting direction via a spring-loaded drive pawl, which serves to transmit the tensioning force to a screw or nut to be tightened or loosened. To simplify assembly, the tensioning wheel has an asymmetrical cross section and is stepped in diameter along its axis, with an annular shoulder at the transition point, which rests on a stringer cheek in the tensioning lever and finds lateral support. On both sides of the tensioning lever, the tensioning wheel with the smaller diameter continues in bearing shells lying on both sides of the tensioning lever, resulting in a bearing point in each of the two bearing shells in addition to the double mounting of the tensioning wheel in the tensioning lever. The interlocking for interaction with the Drive pawl is arranged on the circumference of the tensioning wheel in the area of its larger diameter. As a result, the invention leads to an easy-to-assemble and reliable design for a power wrench with a hydraulic or pneumatic drive.

Claims (2)

  1. Power wrench comprising
    - a tensioning lever (4) which in a housing (1) is held pivotable by means of at least one piston (5, 13) about a pivot axis (11) which extends perpendicular to the direction of action of the piston,
    - a tensioning wheel (8) which comprises a peripheral toothing and is mounted in the tensioning lever (4) rotatable about the pivot axis (11) thereof
    and
    - an operating ratchet (9) which, being tiltably held in the tensioning lever (4), upon pivot movement of the tensioning lever (4) in one direction, under spring load, engages with the peripheral toothing of the tensioning wheel (8) entraining it, upon pivot movement of the tensioning lever (4) in an opposite direction, however, like a ratchet slides over the peripheral toothing of the tensioning wheel (8),
    characterised in
    that the tensioning wheel (8) when looked upon in axial direction is formed asymmetric avoiding any plane of symmetry extending perpendicular to the pivot axis (11),
    that the tensioning wheel (8) within the tensioning lever (4) and lying adjacent to each other along the pivot axis (11) includes a first portion having a first small outer diameter, a second portion having a larger outer diameter and provided with the peripheral toothing and a third portion having an even larger outer diameter,
    that at the joint between the first and the second portion of the tensioning wheel there is formed a radially extending and ring-shaped shoulder (14),
    that the tensioning lever (4) encloses the tensioning wheel (8) by a side wall (15) extending in a direction perpendicular to the pivot axis (11) and by a ring member extending along the direction of the pivot axis (11)
    and
    that the ring-shaped shoulder (14) of the tensioning wheel (8) within the tensioning lever (4) engages the side wall (15) thereof and the third portion of the tensioning wheel having the largest diameter engages an inner surface formed on an end member (3) of the housing (1) and extending perpendicular to the pivot axis (11) each on one side.
  2. Power wrench according to claim 1, characterised in
    that the tensioning wheel (8) along the pivot axis (11) of the tensioning lever (4) on each side and outside the width of the tensioning lever comprises one further portion each having an outer diameter corresponding to that of the portion of the tensioning wheel lying within the tensioning lever (4) and having the smallest outer diameter.
EP87104858A 1986-04-04 1987-04-02 Power wrench Expired - Lifetime EP0240012B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611284 1986-04-04
DE19863611284 DE3611284A1 (en) 1986-04-04 1986-04-04 POWER SCREWDRIVER

Publications (2)

Publication Number Publication Date
EP0240012A1 EP0240012A1 (en) 1987-10-07
EP0240012B1 true EP0240012B1 (en) 1992-03-04

Family

ID=6297906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104858A Expired - Lifetime EP0240012B1 (en) 1986-04-04 1987-04-02 Power wrench

Country Status (2)

Country Link
EP (1) EP0240012B1 (en)
DE (2) DE3611284A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740083C2 (en) * 1987-11-26 1995-01-12 Hans Hohmann Hydraulic power wrench
US5203238A (en) * 1989-10-27 1993-04-20 Raymond Engineering Inc. Low profile rack and pinion wrench

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2936634C2 (en) * 1979-09-11 1982-02-04 Wagner, Paul-Heinz, 5203 Much Screw tool with backstop
DE3322967A1 (en) * 1983-06-25 1985-01-10 Mock-Gerätebau GmbH & Co KG, 2800 Bremen Device for tightening and releasing screwed connections
DE3420446A1 (en) * 1984-06-01 1985-12-05 Applied Power, Inc., Milwaukee, Wis. POWER SCREWDRIVER WITH A POWER ARM AND PREFERRED REAR ARM

Also Published As

Publication number Publication date
DE3776936D1 (en) 1992-04-09
DE3611284A1 (en) 1987-10-22
EP0240012A1 (en) 1987-10-07
DE3611284C2 (en) 1991-06-13

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