EP0508316B1 - Kraftschrauber - Google Patents

Kraftschrauber Download PDF

Info

Publication number
EP0508316B1
EP0508316B1 EP92105760A EP92105760A EP0508316B1 EP 0508316 B1 EP0508316 B1 EP 0508316B1 EP 92105760 A EP92105760 A EP 92105760A EP 92105760 A EP92105760 A EP 92105760A EP 0508316 B1 EP0508316 B1 EP 0508316B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
housing
power wrench
bushing
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
EP92105760A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0508316A1 (de
Inventor
Karl Beuke
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.)
Wagner Paul-Heinz
Original Assignee
Wagner Paul-Heinz
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 Wagner Paul-Heinz filed Critical Wagner Paul-Heinz
Publication of EP0508316A1 publication Critical patent/EP0508316A1/de
Application granted granted Critical
Publication of EP0508316B1 publication Critical patent/EP0508316B1/de
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 pressure-operated power screwdriver for turning screws, nuts and the like.
  • a power screwdriver which has a rotatable ring part in a housing which can be connected to the screw head to be rotated in a rotationally fixed manner.
  • the ring part is rotated in sections by a ratchet lever, which is driven back and forth by a piston.
  • the piston is movable in a cylinder.
  • the piston rod is connected to the piston via a joint located inside the piston and its other end is connected to the ratchet lever via a joint. This oscillating attachment of the piston rod enables the piston rod to adapt to the different pivoting positions of the ratchet lever with respect to the axis of the ring part.
  • the piston has a cylindrical peripheral surface with two sealing rings used in sealing grooves so that the piston axis always coincides with the cylinder axis.
  • a disadvantage of this construction is that the articulated attachment of the piston rod to the piston requires considerable effort and that several components are required for this, which must be manufactured individually and then assembled. The individual parts, such as the joint ball, the ball socket and the ball clamping ring, are difficult to manufacture with the required high accuracy.
  • a power wrench according to the preamble of claim 1 is known from EP-A-0 276 936.
  • This power wrench has a piston with a convex peripheral surface, which is firmly connected to a piston rod.
  • the piston rod passes through an end wall of the cylinder, the passage being sealed by a seal.
  • At the end of the piston rod there is a cross bolt which carries two sliding shoes which protrude into a fork of the driving part and are guided in slots in the housing in such a way that the piston rod can remain essentially in axial alignment and nevertheless remains in engagement with the rotatably mounted driving lever . Slight pivoting movements of the piston rod are only permitted because the piston rod and other parts of the device can deform.
  • a power wrench known from DE-C-36 20 753 has a cylindrical piston which is guided in the cylinder with axial alignment. The piston is reset by a spring supported on the cylinder and acting against the piston.
  • the invention has for its object to provide a power wrench that consists of a few individual parts, is easy to manufacture and can be manufactured with small dimensions.
  • the piston which lies sealingly against the cylinder wall, has a convex peripheral surface, which is preferably spherical. This allows the piston to be tilted while maintaining its seal on the cylinder wall so that the piston axis can have different orientations with respect to the cylinder axis.
  • the piston rod is rigidly attached to the piston.
  • the other end of the piston rod is connected to the driving lever via a swivel joint.
  • the swivel joint moves in a circle around the axis of rotation of the driving lever and its position determines not only the orientation of the piston rod but also the orientation of the piston firmly connected to it.
  • a major advantage is that the piston can be manufactured together with the piston rod as a one-piece part, so that the manufacturing and assembly effort of the entire power wrench is significantly reduced.
  • the axial length of the piston can also be reduced, whereby the dimensions of the housing in the axial direction of the cylinder are kept small.
  • the cylinder is preferably formed by an interchangeable cylinder sleeve inserted into the housing.
  • This cylinder liner is expediently inserted in a corresponding bore in the housing.
  • the exchangeable cylinder liner has the advantage that if the cylinder surface is damaged by foreign objects that have penetrated, only the cylinder liner has to be replaced. Another advantage is that the cylinder liner withstands the working pressure and that the housing forms an additional burst protection, which is effective if the cylinder liner breaks. As a result of the play-free adaptation of the cylinder liner to the housing, the cylinder liner is held rigidly.
  • the cylinder liner is preferably supported by a support liner.
  • This support bushing can also support a spring driving the piston into the retracted position.
  • the power wrench has a one-piece housing 10 made of steel, which consists of a head piece 11 and a drive piece 12.
  • the head piece 11 has a working space 13 which is delimited by two parallel plate-shaped walls.
  • the ring part 14 is rotatably mounted in these walls.
  • the ring part 14 is a tubular part that has a through channel 15 with a profile toothing 16.
  • the shaft of a socket can be inserted from one or the other side, which is placed on the screw head to be rotated.
  • This shaft has an external toothing corresponding to the profile toothing 16, so that the screw head is connected to the ring part 14 in a rotationally fixed manner.
  • the driving lever 17 On the ring part 14, the driving lever 17 is mounted, which has a spring-loaded ratchet element 18, which can come into engagement with a locking toothing 19 of the ring part 14.
  • the ratchet element 18 is arranged and supported on the driving lever 17 in such a way that the driving lever 17 only takes the ring part 14 in one direction of rotation, but can be moved back in the other direction of rotation without driving the ring part in rotation.
  • a cylinder sleeve 20 in a bore, the bore of which forms the cylinder 21.
  • the cylinder liner 20 has a closed bottom 22 at the end facing away from the driving lever 17 and it has an outwardly projecting annular flange 23 at the opposite end, which is supported on an inner annular shoulder 24 of the housing.
  • the cylinder bushing 20 is pressed against the annular shoulder 24 by a support bushing 25 which is inserted into the working part 12 from the working space 13 and is thereby fixed in the axial direction.
  • the support bushing 25 is screwed into an internal thread of the housing with an external thread 26.
  • the stepped bore 27 into which the cylinder bushing 20 and the support bushing 25 are inserted is open at the outer end of the drive part 12 of the housing and closed there with a screwed-on cover 28.
  • a screw 29 screwed through the cover into the cylinder base 22 serves as a rotation lock for the cylinder liner.
  • An annular groove 30 is provided in the bore 27 and seals 31 and 32 are arranged in sealing grooves on both sides of this annular groove.
  • the annular groove 30 is connected to a pressure channel 33 which extends through the housing and leads to a pressure connection 34 of the housing 10.
  • a bore 35 leads from the annular groove 30 through the wall of the cylinder sleeve 22 into the bottom region of the cylinder 21.
  • the piston 36 In the cylinder 21 there is the piston 36, on which the piston rod 37 is rigidly attached.
  • the peripheral surface 38 of the piston is convex.
  • this peripheral surface 38 has a spherical shape, ie it is spherically curved around the center of the piston.
  • a sealing groove with a sealing ring 39 is provided in the equator of the peripheral surface 38.
  • the sealing ring 39 is supported by a radially resilient support ring 40 which is arranged in the interior of the groove.
  • the sealing ring 39 has a rectangular cross section and it lies with its outer surface flat against the cylinder wall, while its end faces lie against the flanks of the sealing groove of the piston.
  • the end of the piston rod 37 facing away from the piston is connected to the driving lever 17 via a joint with a joint axis 42.
  • the hinge axis 42 moves when the driving lever 17 is pivoted about the axis of the ring part 14.
  • the axis of the cylinder 21 extends at right angles to the axis of the ring part 14. If the piston 36 is moved axially in the cylinder 21, the driving lever 17 is thereby pivoted.
  • the piston rod 37 changes its orientation with respect to the axis of the cylinder 21, whereby the piston 36 is tilted in the manner shown. Despite this tilt position, the seal between the piston and the wall of the cylinder 21 is maintained.
  • the piston 36 is propelled in the cylinder 21 by hydraulic pressure which is supplied to the connection 34.
  • the driving lever 17 is pivoted and the ratchet element 18 takes the ring piece 14 with it.
  • the piston movement is limited in that the piston 36 abuts against the end stop 46 of the support bush 25.
  • the piston 36 is moved back by a spring 43 which is supported on an inner flange 44 of the support bushing 25 and surrounds the piston rod 37.
  • the other end of the spring 43 abuts the front piston surface.
  • the support bushing 25 provides the space inside for receiving the compressed spring.
  • the working space 13 of the housing 10 is closed by a cover 45. With the cover removed, the components of the power wrench can be mounted inside the housing through the corresponding opening, including those components which are accommodated in the drive part 12.
  • the piston rod 37 When the spring 43 presses the piston 36 into the retracted position, the piston rod 37 also takes the driving lever 17 with it via the hinge axis 42, but because of the ratchet there is no driving of the ring part 14 with the driving lever.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Actuator (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP92105760A 1991-04-10 1992-04-03 Kraftschrauber Expired - Lifetime EP0508316B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4111631 1991-04-10
DE4111631A DE4111631A1 (de) 1991-04-10 1991-04-10 Kraftschrauber

Publications (2)

Publication Number Publication Date
EP0508316A1 EP0508316A1 (de) 1992-10-14
EP0508316B1 true EP0508316B1 (de) 1995-12-06

Family

ID=6429245

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92105760A Expired - Lifetime EP0508316B1 (de) 1991-04-10 1992-04-03 Kraftschrauber

Country Status (3)

Country Link
EP (1) EP0508316B1 (no)
DE (1) DE4111631A1 (no)
NO (1) NO921340L (no)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9405697U1 (de) * 1993-05-06 1994-07-14 Wagner, Paul-Heinz, 53804 Much Kraftschrauber
DE4330726C1 (de) * 1993-09-10 1995-02-23 Wagner Paul Heinz Kraftschrauber
DE29607207U1 (de) * 1996-04-20 1997-08-21 Wagner, Paul-Heinz, 53804 Much Hydraulischer Kraftschrauber
DE102004019425A1 (de) * 2004-04-19 2005-11-10 Hohmann, Jörg Druckmittelbetriebener Kraftschrauber
RU2510614C1 (ru) * 2013-02-19 2014-04-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Пензенская государственная технологическая академия" Поршневой гайковерт со сдвоенной храповой передачей

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4201099B1 (en) * 1978-08-14 1993-12-07 K. Junkers John Hydraulic wrench
DE3413202A1 (de) * 1984-04-07 1985-10-17 Wagner, Paul-Heinz, 5203 Much Kraftschrauber
JPS62203775A (ja) * 1986-03-03 1987-09-08 株式会社西圧 ボルト・ナツト締結装置
DE3620753A1 (de) * 1986-03-15 1987-09-17 Wagner Paul Heinz Hydraulischer kraftschrauber
DE3634591A1 (de) * 1986-10-10 1988-04-14 Black & Decker Inc Bohrhammer mit einem luftpolsterschlagwerk
GB8701194D0 (en) * 1987-01-20 1987-02-25 Hedley Purvis Ltd Torque wrenches
DE3719893A1 (de) * 1987-06-13 1988-12-29 Wagner Paul Heinz Hydraulischer kraftschrauber
US4825730A (en) * 1987-09-29 1989-05-02 Junkers John K Fluid operated wrench

Also Published As

Publication number Publication date
NO921340D0 (no) 1992-04-07
DE4111631A1 (de) 1992-10-15
NO921340L (no) 1992-10-12
EP0508316A1 (de) 1992-10-14

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