EP0240931B1 - Power wrench - Google Patents

Power wrench Download PDF

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Publication number
EP0240931B1
EP0240931B1 EP19870104859 EP87104859A EP0240931B1 EP 0240931 B1 EP0240931 B1 EP 0240931B1 EP 19870104859 EP19870104859 EP 19870104859 EP 87104859 A EP87104859 A EP 87104859A EP 0240931 B1 EP0240931 B1 EP 0240931B1
Authority
EP
European Patent Office
Prior art keywords
housing
supporting foot
groove
leg
torque wrench
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
EP19870104859
Other languages
German (de)
French (fr)
Other versions
EP0240931A1 (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 EP0240931A1 publication Critical patent/EP0240931A1/en
Application granted granted Critical
Publication of EP0240931B1 publication Critical patent/EP0240931B1/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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0078—Reaction arms
    • 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 power wrench with a housing in which a clamping lever is held pivotably by at least one piston about a pivot axis perpendicular to its direction of movement and with which a support leg for deriving the counter-torque when screwing onto an external abutment relative to the housing at an angle of 90 ° to the direction of movement of the piston is adjustably connected.
  • 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 possibility of a simple and rapid change in the position and in particular the effective length of the support foot without changing its direction of action can be achieved with little manufacturing effort and with full preservation of the connection strength can be preserved.
  • the invention provides a secure and non-rotatable connection between the housing and the support foot, and it enables a simple change in the position of the support foot, in particular also perpendicular to Direction of movement of the piston for the pivoting of the clamping lever and thus to the screwing direction and a quick exchange of the support foot for another.
  • the invention leads to simplifications for the manufacture of the housing with regard to the support foot mounting.
  • 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 18 with driving force, and then undergoes an adjustment to the right. With this adjustment, the working piston 5 works 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 nut or screw to be tightened or loosened. They are limited by the pivoting movement of the tensioning lever 4 triggered by the adjustment of the working piston 5 by means of a stop piece 7 adjoining the cylinder part of the housing 1.
  • a reset piston 13 is also held, which has the same active axis as the working piston 5 and is acted upon by a return spring 31 after relieving the working piston 5 from the hydraulic pressure, the pivoting back of the clamping lever 4 about the axis of rotation 11.
  • a tensioning wheel 6 is mounted coaxially to the axis of rotation 11 in the tensioning lever 4, which via a spring-loaded drive pawl 9 is taken, but does not change its rotational position during the return movement of the clamping lever 4.
  • This tensioning wheel 6 contains in its center coaxial to the axis of rotation 11 a square hole 8 which serves as a connection to the screw or nut to be tightened or loosened. This connection can be made either directly via the square hole 8 itself or with the interposition of a socket 12, as shown in Fig. 2.
  • the housing 1 contains a recess 2 which passes through the housing 1 in its full width transversely to the direction of displacement of the working piston 5 in the axial bore in the housing 1 receiving it.
  • this recess 2 has the shape of a lying bone with a larger longitudinal extension in the direction of movement of the working piston 5 and end extensions.
  • a threaded bore 3 opens into the recess 2 parallel and perpendicular to the direction of movement of the working piston 5, both of which each extend to the outside of the housing 1.
  • the recess 2 in the housing 1 serves as a receptacle and holder for a support leg 10, with clamping screws 34 which can be screwed into the threaded bores 3 to fix it on the housing 1 and which act on the support leg 10 with their inner ends and in the recess 2 in the recess hold the desired position.
  • the support leg 10 is in the form of an L in the illustrated embodiment, and it has a longer leg 14 and a shorter leg 16, as shown in FIG. 2. With the longer leg 14, the support leg 10 can be inserted more or less far into the recess 2 in the housing 1, for which purpose the cross section of the leg 14 is adapted to that of the recess 2. In this way, the support foot 10 can be adjusted with a precise fit relative to the housing 1, while maintaining its angular position relative to the housing 1.
  • the direction of the two legs 14 and 16 of the support foot 20 relative to one another corresponds to the orientation the longitudinal direction of the recess 2 in the housing 1 relative to the axial bore for the working piston 5.
  • the recess 2 runs perpendicular to the axial bore for the working piston 5, that is to say perpendicular to its direction of movement, and accordingly the two legs 14 and 16 also extend in the L-shape of the support leg 10 perpendicular to each other.
  • the device according to the invention is a power wrench in which, with the help of an adjustable support foot, the counter-torque that occurs during the screwing operation with the piston-operated pivoting of a tensioning lever with a ratchet-like tensioning wheel can be derived from an external abutment.
  • the support foot in the housing of the power screwdriver is received and held in a continuous recess, which specifies a fixed angular position relative to the housing for the support foot, but permits adjustment of the support foot, in particular, transversely to the active axis of the working piston for the screwing process.
  • the shape of a bone with extended ends or a dumbbell is preferred, the larger cross section extending expediently parallel to the direction of movement of the working piston for the pivoting lever pivoting.
  • the recess penetrates the housing perpendicular to this direction of movement, and the support foot has the shape of an L with mutually perpendicular legs, one of which is accommodated in the recess in the housing, while the other can be attached to the outer abutment, intermediate pieces, if necessary can be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Surgical Instruments (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Ladders (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)

Description

Die Erfindung betrifft einen Kraftschrauber mit einem Gehäuse, in dem ein Spannhebel durch wenigstens einen Kolben um eine zu dessen Bewegungsrichtung senkrechte Schwenkachse verschwenkbar gehalten ist und mit dem ein Stützfuß für die Ableitung des Gegenmoments beim Schrauben auf ein äußeres Widerlager gegenüber dem Gehäuse unter einem Winkel von 90° zur Bewegungsrichtung des Kolbens verstellbar verbunden ist.The invention relates to a power wrench with a housing in which a clamping lever is held pivotably by at least one piston about a pivot axis perpendicular to its direction of movement and with which a support leg for deriving the counter-torque when screwing onto an external abutment relative to the housing at an angle of 90 ° to the direction of movement of the piston is adjustably connected.

Bei bekannten Kraftschraubern dieser Art (siehe z.B. DE-A-2559327) wird die Verstellbarkeit des Stützfußes gegenüber dem Gehäuse mit Hilfe einer Verzahnung am Gehäuse erreicht, an der sich der Stützfuß verdrehen läßt. Eine derartige Stützfußlagerung ist jedoch zum einen aufwendig in der Fertigung und zum anderen zwangsläufige Ursache für Richtungsänderungen der Stützfußachse, die für den Schraubvorgang unerwünschte Auswirkungen haben können.In known power screwdrivers of this type (see e.g. DE-A-2559327), the adjustability of the support foot relative to the housing is achieved by means of a toothing on the housing, on which the support foot can be rotated. However, such a support foot mounting is complex on the one hand and, on the other hand, an inevitable cause for changes in direction of the support foot axis, which can have undesirable effects for the screwing process.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Kraftschrauber der eingangs erwähnten Art so auszubilden, daß sich mit geringem Fertigungsaufwand und bei voller Wahrung der Verbindungsfestigkeit die Möglichkeit für eine einfache und rasche Veränderung der Lage und insbesondere der wirksamen Länge des Stützfußes ohne Änderung von dessen Wirkungsrichtung erhalten läßt.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 possibility of a simple and rapid change in the position and in particular the effective length of the support foot without changing its direction of action can be achieved with little manufacturing effort and with full preservation of the connection strength can be preserved.

Die gestellte Aufgabe wird gemäß der Erfindung gelöst durch einen Kraftschrauber, wie er im Patentanspruch 1 gekennzeichnet ist; vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.The object is achieved according to the invention by a power wrench as characterized in claim 1; advantageous refinements and developments of the invention result from the subclaims.

Die Erfindung ergibt eine sichere und drehfeste Verbindung zwischen Gehäuse und Stützfuß, und sie ermöglicht eine einfache Veränderung der Lage des Stützfußes insbesondere auch senkrecht zur Bewegungsrichtung des Kolbens für die Verschwenkung des Spannhebels und damit zur Schraubrichtung und einen raschen Austausch des Stützfußes gegen einen anderen. Außerdem führt die Erfindung zu Vereinfachungen für die Gehäusefertigung hinsichtlich der Stützfußlagerung.The invention provides a secure and non-rotatable connection between the housing and the support foot, and it enables a simple change in the position of the support foot, in particular also perpendicular to Direction of movement of the piston for the pivoting of the clamping lever and thus to the screwing direction and a quick exchange of the support foot for another. In addition, the invention leads to simplifications for the manufacture of the housing with regard to the support foot mounting.

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

Fig. 1
einen Längsschnitt durch einen Kraftschrauber gemäß der Erfindung
und
Fig. 2
eine Draufsicht auf den Kraftschrauber von Fig. 1.
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
a longitudinal section through a power wrench according to the invention
and
Fig. 2
a plan view of the power screwdriver of Fig. 1st

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 18 mit Antriebskraft beaufschlagt werden kann, und dann eine Verstellung nach rechts erfährt. Bei dieser Verstellung wikrt 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 Mutter oder Schraube zusammenfällt. Ihre Begrenzung findet die durch die Verstellung des Arbeitskolbens 5 ausgelöste Schwenkbewegung des Spannhebels 4 durch ein an den Zylinderteil des Gehäuses 1 anschließendes Anschlagstück 7. In diesem Anschlagstück 7 ist außerdem ein Rückstellkolben 13 gehalten, der die gleiche Wirkachse aufweist wie der Arbeitskolben 5 und unter Beaufschlagung durch eine Rückstellfeder 31 nach der Entlastung des Arbeitskolbens 5 vom Hydraulikdruck die Rückverschwenkung des Spannhebels 4 um die Drehachse 11 herbeiführt.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 18 with driving force, and then undergoes an adjustment to the right. With this adjustment, the working piston 5 works 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 nut or screw to be tightened or loosened. They are limited by the pivoting movement of the tensioning lever 4 triggered by the adjustment of the working piston 5 by means of a stop piece 7 adjoining the cylinder part of the housing 1. In this stop piece 7 a reset piston 13 is also held, which has the same active axis as the working piston 5 and is acted upon by a return spring 31 after relieving the working piston 5 from the hydraulic pressure, the pivoting back of the clamping lever 4 about the axis of rotation 11.

Koaxial zur Drehachse 11 ist im Spannhebel 4 ein Spannrad 6 gelagert, das bei der Arbeitsbewegung des Spannhebels 4 über eine federbelastete Antriebsklinke 9 mitgenommen wird, bei der Rückstellbewegung des Spannhebels 4 jedoch seine Drehstellung nicht ändert. Dieses Spannrad 6 enthält in seinem Zentrum koaxial zur Drehachse 11 ein Vierkantloch 8, das als Verbindung zu der anzuziehenden oder zu lösenden Schraube oder Mutter dient. Diese Verbindung kann entweder unmittelbar über das Vierkantloch 8 selbst oder aber unter Zwischenschaltung einer Stecknuß 12 erfolgen, wie sie in Fig. 2 dargestellt ist.A tensioning wheel 6 is mounted coaxially to the axis of rotation 11 in the tensioning lever 4, which via a spring-loaded drive pawl 9 is taken, but does not change its rotational position during the return movement of the clamping lever 4. This tensioning wheel 6 contains in its center coaxial to the axis of rotation 11 a square hole 8 which serves as a connection to the screw or nut to be tightened or loosened. This connection can be made either directly via the square hole 8 itself or with the interposition of a socket 12, as shown in Fig. 2.

Unterhalb der Bohrung mit dem Arbeitskolben 5 enthält das Gehäuse 1 eine Ausnehmung 2, die das Gehäuse 1 in dessen voller Breite quer zur Verschiebungsrichtung des Arbeitskolbens 5 in der ihn aufnehmenden Axialbohrung im Gehäuse 1 durchsetzt. In ihrem Querschnitt weist diese Ausnehmung 2 die Form eines liegenden Knochens mit in der Bewegungsrichtung des Arbeitskolbens 5 größerer Längserstrekkung und endseitigen Erweiterungen auf. In die Ausnehmung 2 münden parallel und senkrecht zur Bewegungsrichtung des Arbeitskolbens 5 je eine Gewindebohrung 3, die beide jeweils bis zur Außenseite des Gehäuses 1 reichen. Die Ausnehmung 2 im Gehäuse 1 dient als Aufnahme und Halterung für einen Stützfuß 10, wobei zu dessen Festlegung am Gehäuse 1 in die Gewindebohrungen 3 Klemmschrauben 34 einschraubbar sind, die mit ihren inneren Enden auf den Stützfuß 10 einwirken und diesen in der Ausnehmung 2 in der jeweils gewünschten Stellung festhalten.Below the bore with the working piston 5, the housing 1 contains a recess 2 which passes through the housing 1 in its full width transversely to the direction of displacement of the working piston 5 in the axial bore in the housing 1 receiving it. In its cross-section, this recess 2 has the shape of a lying bone with a larger longitudinal extension in the direction of movement of the working piston 5 and end extensions. A threaded bore 3 opens into the recess 2 parallel and perpendicular to the direction of movement of the working piston 5, both of which each extend to the outside of the housing 1. The recess 2 in the housing 1 serves as a receptacle and holder for a support leg 10, with clamping screws 34 which can be screwed into the threaded bores 3 to fix it on the housing 1 and which act on the support leg 10 with their inner ends and in the recess 2 in the recess hold the desired position.

Der Stützfuß 10 ist bei dem dargestellten Ausführungsbeispiel in Form eines L ausgebildet, und er besitzt einen längeren Schenkel 14 und einen kürzeren Schenkel 16, wie die Darstellung in Fig. 2 zeigt. Mit dem längeren Schenkel 14 ist der Stützfuß 10 mehr oder weniger weit in die Ausnehmung 2 im Gehäuse 1 einführbar, wozu der Querschnitt des Schenkels 14 dem der Ausnehmung 2 angepaßt ist. Auf diese Weise läßt sich der Stützfuß 10 paßgenau relativ zum Gehäuse 1 verstellen, wobei er seine Winkelstellung gegenüber dem Gehäuse 1 beibehält. Die Richtung der beiden Schenkel 14 und 16 des Stützfußes 20 relativ zueinander korrespondiert mit der Orientierung der Längsrichtung der Ausnehmung 2 im Gehäuse 1 relativ zur Axialbohrung für den Arbeitskolben 5. Bei dem dargestellten Beispiel verläuft die Ausnehmung 2 senkrecht zu der Axialbohrung für den Arbeitskolben 5, also senkrecht zu dessen Bewegungsrichtung, und entsprechend verlaufen auch die beiden Schenkel 14 und 16 in der L-Form des Stützfußes 10 senkrecht zueinander.The support leg 10 is in the form of an L in the illustrated embodiment, and it has a longer leg 14 and a shorter leg 16, as shown in FIG. 2. With the longer leg 14, the support leg 10 can be inserted more or less far into the recess 2 in the housing 1, for which purpose the cross section of the leg 14 is adapted to that of the recess 2. In this way, the support foot 10 can be adjusted with a precise fit relative to the housing 1, while maintaining its angular position relative to the housing 1. The direction of the two legs 14 and 16 of the support foot 20 relative to one another corresponds to the orientation the longitudinal direction of the recess 2 in the housing 1 relative to the axial bore for the working piston 5. In the example shown, the recess 2 runs perpendicular to the axial bore for the working piston 5, that is to say perpendicular to its direction of movement, and accordingly the two legs 14 and 16 also extend in the L-shape of the support leg 10 perpendicular to each other.

Zusammenfassend ist die erfindungsgemäße Vorrichtung ein Kraftschrauber, bei dem mit Hilfe eines verstellbaren Stützfußes das während des Schraubvorganges unter kolbenbetätigter Verschwenkung eines Spannhebels mit einem ratschenartig arbeitenden Spannrad auftretende Gegenmoment auf ein äußeres Widerlager abgeleitet werden kann. Dabei findet der Stützfuß im Gehäuse des Kraftschraubers Aufnahme und Halt in einer durchgehenden Ausnehmung, die dem Stützfuß eine feste Winkelstellung relativ zum Gehäuse vorgibt, aber eine Verstellung des Stützfußes insbesondere quer zur Wirkachse des Arbeitskolbens für den Schraubvorgang zuläßt. Für den Querschnitt der den Stützfuß aufnehmenden Ausnehmung im Gehäuse ist die Form eines Knochens mit erweiterten Enden bzw. einer Hantel bevorzugt, wobei die größere Querschnittserstreckung zweckmäßig parallel zur Bewegungsrichtung des Arbeitskolbens für die Spannhebelverschwenkung verläuft. Die Ausnehmung durchsetzt das Gehäuse senkrecht zu dieser Bewegungsrichtung, und der Stützfuß weist die Form eines L mit zueinander senkrechten Schenkeln auf, von denen der eine Aufnahme in der Ausnehmung im Gehäuse findet, während der andere an das äußere Widerlager ansetzbar ist, wobei gegebenenfalls noch Zwischenstücke einsetzbar sind.In summary, the device according to the invention is a power wrench in which, with the help of an adjustable support foot, the counter-torque that occurs during the screwing operation with the piston-operated pivoting of a tensioning lever with a ratchet-like tensioning wheel can be derived from an external abutment. The support foot in the housing of the power screwdriver is received and held in a continuous recess, which specifies a fixed angular position relative to the housing for the support foot, but permits adjustment of the support foot, in particular, transversely to the active axis of the working piston for the screwing process. For the cross section of the recess in the housing receiving the support foot, the shape of a bone with extended ends or a dumbbell is preferred, the larger cross section extending expediently parallel to the direction of movement of the working piston for the pivoting lever pivoting. The recess penetrates the housing perpendicular to this direction of movement, and the support foot has the shape of an L with mutually perpendicular legs, one of which is accommodated in the recess in the housing, while the other can be attached to the outer abutment, intermediate pieces, if necessary can be used.

Claims (8)

  1. Power wrench comprising a housing (1),
    - in which a tensioning lever (4) is mounted pivotable by means of at least one piston (5, 13) about a pivot axis (11) perpendicular to the moving direction thereof
    and
    - with which a supporting foot (10) for transferring the counter-torque on screwing to an external abutment is connected adjustable relative to the housing (1) under an angle of 90° against the moving direction of the piston (5),
    characterised in
    that the housing (1) includes a groove (2) fully traversing it having a longitudinal axis extending parallel to the direction of the pivot axis (11) of the tensioning lever (4) for receiving the supporting foot (10)
    and
    that the supporting foot (10) is formed as an L having a first leg (14) capable to be adjustably introduced into the groove (2) along the longitudinal axis thereof and to be secured therein and a second leg (16) engageable with the external abutment.
  2. Torque wrench according to claim 1, characterised in
    that the groove (2) in the housing (1) has a cross-section having its longer extension parallel to the direction of the leg (16) of the supporting foot (10) engageable with the external abutment.
  3. Torque wrench according to claim 2, characterised in
    that the groove (2) in the housing (1) has a cross-section formed as a bone having extended ends.
  4. Torque wrench according to one or more of the claims 1 to 3, characterised in
    that the two legs (14 and 16) of the supporting foot (10) run rectangular to each other.
  5. Torque wrench according to one or more of the claims 1 to 4, characterised in
    that the first leg (14) of the supporting foot (10) is longer than the second leg (16) thereof.
  6. Torque wrench according to one or more of the claims 1 to 5, characterised in
    that the supporting foot (10) is securable within the groove (2) in the housing (1) by means of at least one clamping screw (34).
  7. Torque wrench according to claim 6, characterised in
    that at least two clamping screws (34) are provided having their working directions for securing the supporting foot (10) within the groove (2) in the housing (1) perpendicular to each other.
  8. Torque wrench according to claim 6 or 7, characterised in
    that the housing (1) includes at least one threaded bore (3) extending perpendicular to the groove (2) for receiving the clamping screws (34).
EP19870104859 1986-04-04 1987-04-02 Power wrench Expired - Lifetime EP0240931B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3611368 1986-04-04
DE19863611368 DE3611368A1 (en) 1986-04-04 1986-04-04 POWER SCREWDRIVER

Publications (2)

Publication Number Publication Date
EP0240931A1 EP0240931A1 (en) 1987-10-14
EP0240931B1 true EP0240931B1 (en) 1991-11-13

Family

ID=6297962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870104859 Expired - Lifetime EP0240931B1 (en) 1986-04-04 1987-04-02 Power wrench

Country Status (3)

Country Link
EP (1) EP0240931B1 (en)
DE (2) DE3611368A1 (en)
ES (1) ES2027984T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3719893A1 (en) * 1987-06-13 1988-12-29 Wagner Paul Heinz HYDRAULIC SCREWDRIVER
JPH03196977A (en) * 1989-12-15 1991-08-28 John K Junkers Power wrench
DE4210511C2 (en) * 1992-03-31 1994-06-16 Wagner Paul Heinz Hydraulic power wrench
DE4210512C2 (en) * 1992-03-31 1994-04-28 Wagner Paul Heinz Hydraulic power wrench
WO2019036550A1 (en) * 2017-08-16 2019-02-21 HYTORC Division Unex Corporation Apparatus for tightening threaded fasteners

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2559327A1 (en) * 1975-12-31 1977-07-14 Guenter Trautmann Hydraulic multipurpose spanner for tight fasteners - has interchangeable ring and key attachments with slotted lever arm
DE3131582A1 (en) * 1981-08-10 1983-02-24 Hubert Prof. Dr.-Ing. 8000 München Kurz Device for turning countersunk head bolts

Also Published As

Publication number Publication date
DE3774466D1 (en) 1991-12-19
EP0240931A1 (en) 1987-10-14
ES2027984T3 (en) 1992-07-01
DE3611368A1 (en) 1987-10-08

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