EP0163009B1 - Kraftschrauber mit einem Kraftarm und einem vorzugsweise als Gehäuse ausgebildeten Reaktionsarm - Google Patents

Kraftschrauber mit einem Kraftarm und einem vorzugsweise als Gehäuse ausgebildeten Reaktionsarm Download PDF

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Publication number
EP0163009B1
EP0163009B1 EP85101942A EP85101942A EP0163009B1 EP 0163009 B1 EP0163009 B1 EP 0163009B1 EP 85101942 A EP85101942 A EP 85101942A EP 85101942 A EP85101942 A EP 85101942A EP 0163009 B1 EP0163009 B1 EP 0163009B1
Authority
EP
European Patent Office
Prior art keywords
arm
power
tensioning wheel
reaction
power arm
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
EP85101942A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0163009A2 (de
EP0163009A3 (en
Inventor
Hans-Bernd Mierbach
Gustav Frohn
Olaf Blockisch
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 EP0163009A2 publication Critical patent/EP0163009A2/de
Publication of EP0163009A3 publication Critical patent/EP0163009A3/de
Application granted granted Critical
Publication of EP0163009B1 publication Critical patent/EP0163009B1/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 tensioning wheel, the power arm that surrounds the tensioning wheel, and the reaction arm which in turn completely engages around the power arm.
  • the reaction arm designed as a housing also has an opening at its first end region which runs centrally to the axis and in which the circular, first end region of the power arm is guided on the outside. Because of these three parts arranged concentrically and in shells, the distance from an inner opening of the tensioning wheel to the outside of the reaction arm is quite large in the area of its first end area.
  • the clearance of the known power screwdriver according to DE-OS 30 08 381 is determined by the outer diameter of the first end region of the reaction arm. Regardless of the tensioning wheels used, this clearance is always the same.
  • the free dimension is still acceptable when using the tensioning wheel with the largest hexagon socket, when using the tensioning wheel with the smallest hexagon socket, the free dimension is disadvantageously large.
  • a special power wrench would have to be manufactured for all common widths at least. However, this would result in a very high outlay in terms of production, storage and use.
  • power screwdrivers are therefore manufactured for a certain range of nominal wrenches in which the required tensioning wheels can be used. But then the goal is not to keep the clearance for a wrench about as large as it is for a ring wrench.
  • the decisive difference compared to the previously known power screwdriver according to DE-OS 30 08 381 is that the power arm is no longer supported in a circular opening of the reaction arm, so the guide between the power arm and reaction arm does not extend over 360 °, but this guide is between the axis and the second end region of the arms and extends over a maximum of 180 °.
  • the reaction arm no longer surrounds the power arm (as in the previously known power screwdriver), but ends above a line which runs transversely to the longitudinal direction of the reaction arm and through the axis.
  • the clearance of the power wrench described in this way, in particular the radial clearance is therefore no longer determined by the external dimensions of the reaction arm, but only by the circular, free end of the power arm.
  • the inventive design of the power wrench can be realized on a power wrench according to DE-OS 30 08 381, here preferably the power cylinder is arranged in the reaction arm in order to be able to carry out the assembly of power arm and tensioning wheel including pawl as simply as possible.
  • a power wrench according to DE-OS 34 07 126 (published on August 29, 1985) is used, in which an approximately pear-shaped force arm is provided, which is located within the cylinder bore with its smaller drive head and engages in a recess in the piston, wherein the axis line of the cylinder bore extends transversely to the longitudinal direction of the power cylinder.
  • the reaction arm is designed as a housing and preferably consists of a housing part and bearing shells that can be fastened laterally and with simple means to this housing part, in which the guide for the power arm is formed.
  • the power arm can then be pulled out of the housing part. This makes replacing the power arms particularly easy.
  • the power screwdriver shown in the figures has a reaction arm 1 designed as a housing and a power arm 2, each of which is guided at its first end regions, which are lower in the figures, about a common axis 3 and can be pivoted relative to one another.
  • the power arm 2 has a circular bore 4 at its first, lower end region, in which a tensioning wheel 5 is rotatably mounted about the axis 3. It has an internal hexagon 6 and on its outer, largely cylindrical lateral surface an outwardly projecting toothing 7. With this toothing 7, a pawl 8 interacts, which is arranged in a bay 9 of the power arm 2.
  • a hydraulic power cylinder comprising a cylinder 10 and a piston 11 is arranged in the reaction arm, the power transmission between this piston 11 and dev power arm 2 takes place in accordance with the teaching of DE-OS 3407126, the disclosure content of which is an integral part of the present application.
  • the reaction arm 1 is composed of three parts that can be easily dismantled: on the one hand from a housing part 12, in which the hydraulic power cylinder, the connections and other parts are located, and on the other hand from two bearing shells 13, 14, which are located in their upper part End area are flush and positively fitted into a recess 15 of the housing part 12.
  • the bearing shells 13, 14 are connected to the housing part 12 by means of a plurality of easily detachable screws 16.
  • the housing part 12 already ends at a large distance from the axis 3, in the exemplary embodiment on a line that runs parallel to the working direction of the hydraulic power cylinder and through the pawl 8, it therefore does not determine the clearance of the power wrench.
  • the two bearing shells 13, 14 protrude relative to the housing part 12 in the direction of the axis 3, but they are in front of a line which also runs parallel to the axis 17 of the hydraulic power cylinder and passes through the axis 3.
  • the bearing shells 13, 14 therefore do not extend into a half space around the axis 3, which is denoted by the arrows 18 in FIG. 1; in other words, they do not determine the clearance, in particular the radial clearance of the power wrench.
  • a projection 19 is provided which, when the bearing shells 13, 14 are mounted, points inwards and extends over approximately 170 °. It serves to guide the power arm 2 about the axis 3, which will be discussed in more detail below.
  • the power arm consists of two half-arms 20, 21 of equal thickness (see FIG. 2), in each of which part of the bay 9 is milled out. Except for the course of this bay, which is a mirror image, the two half arms 20, 21 are congruent.
  • the . Both half arms 20, 21 are connected to one another by suitable means, for example laterally projections 22, other connecting means and locations are possible.
  • the force arm 2 composed of the two half arms 20, 21 is essentially pear-shaped, has an output head 23 located in FIGS. 1 and 2, which is located at least partially within the cylinder 10 and in a recess 24 adapted to it on both sides of the piston 11 (see Figure 2) is inserted. It is carried in both directions of movement of the piston 11.
  • the pawl 8 is located entirely within the power arm 2, so that it can be replaced without being in the mechanics the pawl 8 can intervene.
  • the pawl 8 in the engagement position shown in FIG. 1 only rests with its surface 25 against the obliquely extending snap-in flank 26 without striking its front surface directly at the edge of the bay 9. This ensures that even when the teeth of the pawl 8 or the teeth 7 wear, a precise engagement position is always achieved without this engagement position being predetermined by a stationary stop.
  • FIG. 2 shows, in the two half arms 20, 21 of the power arm 2, a circular arc, concentric to the axis 3 and extending over about 90 ° extending guide groove 27 is provided, in which the projection 19 engages with a precise fit and largely rattle-free, so that an arc guide is formed.
  • This guide takes over the task of the circular-shaped guide surface of the reaction arm in the power wrench according to DE-OS 34 07 126. As the figures show, this guide is located between the axis 3 and the second end regions of the arms 1, 2 located at the top in the figures , so that this guide is not in the half-space indicated by the arrows 18.
  • the practical design of the guide is arbitrary in itself, the guide shown from the projection 19 and the guide groove 27 can be seen essentially as a favorable embodiment. Kinematic reversal is possible, furthermore any other guides are possible as long as they are outside the lower half space (arrows 18) and do not impair the passage through the hexagon 6 on both sides. This free passage through the hexagon 6 is a feature which is advantageous for the practical use of the power screwdriver and has already been implemented in the previously known power screwdrivers.
  • the power wrench shown in the figures is equipped with a tensioning wheel 5 with the largest possible hexagon socket. If you want to use the power wrench for screws or nuts with a smaller wrench size, the tensioning wheel 5 is not replaced, but the complete, approximately pear-shaped and all-round closed unit consisting of the two arms 20, 21 forming the power arm 2, the tensioning wheel 5 and the pawl 8 together with accessories , such as an internal pawl spring. To replace this unit with another, it is sufficient to unscrew the two bearing shells 13, 14 from the housing part 12, the fork-shaped force arm 2 in its second (upper) end region can then be inserted into the downwardly open recess 24 via the drive head 23.
  • a spindle holder with an adjustable spindle can be detachably attached to the left-hand part of the housing part 12 in FIG. 1, the spindle being located above or below the levels of the bearing shells 13, 14. It is adjusted so that it strikes with its front end and forms the abutment for the reaction arm 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
EP85101942A 1984-06-01 1985-02-22 Kraftschrauber mit einem Kraftarm und einem vorzugsweise als Gehäuse ausgebildeten Reaktionsarm Expired - Lifetime EP0163009B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3420446 1984-06-01
DE19843420446 DE3420446A1 (de) 1984-06-01 1984-06-01 Kraftschrauber mit einem kraftarm und einem vorzugsweise als gehaeuse ausgebildeten reaktionsarm

Publications (3)

Publication Number Publication Date
EP0163009A2 EP0163009A2 (de) 1985-12-04
EP0163009A3 EP0163009A3 (en) 1987-05-06
EP0163009B1 true EP0163009B1 (de) 1990-09-05

Family

ID=6237380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101942A Expired - Lifetime EP0163009B1 (de) 1984-06-01 1985-02-22 Kraftschrauber mit einem Kraftarm und einem vorzugsweise als Gehäuse ausgebildeten Reaktionsarm

Country Status (5)

Country Link
US (1) US4765210A (ja)
EP (1) EP0163009B1 (ja)
JP (1) JPS6156875A (ja)
DE (2) DE3420446A1 (ja)
ES (1) ES296614Y (ja)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8525983D0 (en) * 1985-10-22 1985-11-27 Hydra Tight Ltd Power tools
DE3611284A1 (de) * 1986-04-04 1987-10-22 Applied Power Inc Kraftschrauber
GB8902659D0 (en) * 1989-02-07 1989-03-30 Hedley Purvis Ltd Improved hydraulic torque wrench
JPH02232177A (ja) * 1989-03-07 1990-09-14 John K Junkers 液圧作動レンチ
DE4210512C2 (de) * 1992-03-31 1994-04-28 Wagner Paul Heinz Druckmittelbetätigter Kraftschrauber
US6237446B1 (en) 1999-10-26 2001-05-29 Genlyte Thomas Group Llc Wrench adapter assembly
US6330842B1 (en) * 2000-06-26 2001-12-18 Kevin Brun Compact head power driven ratchet tool
US20050051002A1 (en) * 2003-09-05 2005-03-10 Kevin Brun Sealed powered ratchet wrench
SE528112C2 (sv) 2004-10-01 2006-09-05 Atlas Copco Tools Ab Monteringsanordning för skruvdragare
SE529853C2 (sv) * 2006-03-30 2007-12-11 Atlas Copco Tools Ab Monteringsanordning för fastsättning av ett element på ett rörformigt organ
US8499853B2 (en) * 2009-11-16 2013-08-06 Norwolf Tool Works, Inc. Apparatus and methods for controlling hydraulically powered equipment
US8789445B1 (en) 2012-05-04 2014-07-29 Charles Burridge Hawley, III Air powered nut runner
US9550282B2 (en) * 2014-04-22 2017-01-24 John D. Davis Compact hydraulic torque wrench cartridge
GB2558536A (en) * 2016-11-14 2018-07-18 Torque Tension Systems Ltd A hydraulic torque wrench
USD1042067S1 (en) * 2023-02-28 2024-09-17 Primesource Consulting Llc Limited clearance tool

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3097551A (en) * 1963-07-16 schmitt
US2636411A (en) * 1951-03-09 1953-04-28 Weldon A Wood Open end ratchet wrench
US2660910A (en) * 1951-05-15 1953-12-01 Albert E G Sellers Ratchet wrench
US3527327A (en) * 1968-12-04 1970-09-08 Gen Motors Corp Overrunning clutch
US4380859A (en) * 1979-05-07 1983-04-26 Sumitomo Metal Industries, Ltd. Method for tightening fastener on axially connected rod-like members
US4440046A (en) * 1980-03-05 1984-04-03 Paul-Heinz Wagner Power wrench
DE3008381A1 (de) * 1980-03-05 1981-09-10 Wagner, Paul-Heinz, 5203 Much Drehwerkzeug
US4339968A (en) * 1980-07-21 1982-07-20 Willard Krieger Hydraulic torque multiplier wrench
US4368655A (en) * 1980-11-12 1983-01-18 Junkers John K Continuous ratchet drive
DE3407126A1 (de) * 1984-02-28 1985-08-29 Enerpac GmbH, 4300 Essen Kraftschrauber mit einem, eine feinstufige verzahnung aufweisenden spannrad

Also Published As

Publication number Publication date
DE3579494D1 (de) 1990-10-11
EP0163009A2 (de) 1985-12-04
EP0163009A3 (en) 1987-05-06
ES296614U (es) 1988-11-16
JPS6156875A (ja) 1986-03-22
ES296614Y (es) 1989-06-01
US4765210A (en) 1988-08-23
DE3420446A1 (de) 1985-12-05

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