EP0240012B1 - Kraftschrauber - Google Patents

Kraftschrauber 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)
English (en)
French (fr)
Other versions
EP0240012A1 (de
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/de
Application granted granted Critical
Publication of EP0240012B1 publication Critical patent/EP0240012B1/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 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.

Landscapes

  • 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)
EP87104858A 1986-04-04 1987-04-02 Kraftschrauber Expired - Lifetime EP0240012B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863611284 DE3611284A1 (de) 1986-04-04 1986-04-04 Kraftschrauber
DE3611284 1986-04-04

Publications (2)

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

Family

ID=6297906

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104858A Expired - Lifetime EP0240012B1 (de) 1986-04-04 1987-04-02 Kraftschrauber

Country Status (2)

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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3740083C2 (de) * 1987-11-26 1995-01-12 Hans Hohmann Hydraulischer Kraftschrauber
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 (de) * 1979-09-11 1982-02-04 Wagner, Paul-Heinz, 5203 Much Schraubenwerkzeug mit Rücklaufsperre
DE3322967A1 (de) * 1983-06-25 1985-01-10 Mock-Gerätebau GmbH & Co KG, 2800 Bremen Vorrichtung zum anziehen und loesen von schraubverbindungen
DE3420446A1 (de) * 1984-06-01 1985-12-05 Applied Power, Inc., Milwaukee, Wis. Kraftschrauber mit einem kraftarm und einem vorzugsweise als gehaeuse ausgebildeten reaktionsarm

Also Published As

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

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