EP0280649B1 - Werkzeug zur Erzeugung einer Axialkraft - Google Patents

Werkzeug zur Erzeugung einer Axialkraft Download PDF

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Publication number
EP0280649B1
EP0280649B1 EP88810091A EP88810091A EP0280649B1 EP 0280649 B1 EP0280649 B1 EP 0280649B1 EP 88810091 A EP88810091 A EP 88810091A EP 88810091 A EP88810091 A EP 88810091A EP 0280649 B1 EP0280649 B1 EP 0280649B1
Authority
EP
European Patent Office
Prior art keywords
rod
tool
working piston
tool according
piston
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
EP88810091A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0280649A1 (de
Inventor
Alois Camenzind
René Frosio
Anton Harnischberg
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.)
ABNOX AG
Original Assignee
ABNOX AG
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 ABNOX AG filed Critical ABNOX AG
Priority to AT88810091T priority Critical patent/ATE68390T1/de
Publication of EP0280649A1 publication Critical patent/EP0280649A1/de
Application granted granted Critical
Publication of EP0280649B1 publication Critical patent/EP0280649B1/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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/026—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same fluid driven

Definitions

  • the invention relates to a tool for generating an axial force relative to a rod, for the disassembly or assembly of bodies held on the rod by press fit, in particular for loosening the knot connection of a tubular construction, with a device for the supply having a storage container for hydraulic fluid and a pump from hydraulic fluid under pressure to a first pressure line leading to the working piston of a clamp for fixing the tool to the rod and to a second pressure line leading to the working piston for generating the relative axial force.
  • Tools of this type are known, for example, as a pulling device for pulling off a gearwheel which is axially fixed by press fit on a machine shaft.
  • One part of the tool grips the part to be removed, ie the gearwheel, while the other part, eg a threaded spindle, is supported on the end face of the shaft.
  • the rod in order to press or on a rod or the like. axially fixed body to move relative to this when the free end of the rod, a paragraph or the like. are not accessible on the rod for supporting the tool, such as, for example, on certain tubular structures, the rod must be held on its peripheral surface in order to be able to generate an axial force relative to it.
  • the clamping force must be distributed evenly over the surface, and a relatively large clamping force is required in order to generate sufficient frictional forces .
  • a device of the type mentioned is known from CA-A-1113228. With it, hydraulic fluid is supplied to the working pistons via separately arranged pressure hoses, with the hydraulic fluid being supplied sequentially in time by the independent, arbitrary actuation of a check valve arranged in each pressure line. It is therefore disadvantageous that the operation of the device, in addition to its handling for attachment to the rod, requires the actuation of two valves, the second valve being allowed to be actuated only after the effectiveness of the clamping device has been checked.
  • Pipe constructions of the type mentioned are known for example from CH-PS 382935 and DE-PS 2713380.
  • the assembly of the hollow rods, i.e. of the pipes is carried out by impact forces, so that the pipe end is pressed onto the connecting pins of the node connections. So far, these connections have also been released by impact forces.
  • the application of the impact forces is labor-intensive and leads to uncontrolled reaction forces, since strong inertial forces act to generate the relative force on the pipe and on the pipe construction, unless the pipe is held back by clamping.
  • another is therefore known in which the clamping force on the connecting pin of the node connection is generated by an axial screw enclosed by the pipe, which radially expands a clamping ring.
  • Such a tube construction therefore does not require large axial forces relative to the tube for assembly and disassembly, but this assembly and disassembly method is also complex, since the operation of the knot connection through the tube requires correspondingly long screwdrivers.
  • the invention has for its object to find a tool of the type mentioned, which is suitable in a handy and compact form, relative to a rod or the like. generate high axial forces and which allows it to be fixed to the circumferential surface of the rod without damaging this surface.
  • the tool should be particularly suitable for location-independent use in the disassembly or assembly of a pipe construction, the pipes of which are held together by press fit at the node connection. Furthermore, the tool should have a simple and reliable internal structure.
  • the object is achieved by a tool of the type mentioned at the beginning, in which between a storage container for hydraulic fluid and a pressure line a pump is arranged and in the pressure line there is a pressure relief valve which divides the pressure line into a first and second pressure line, the first pressure line to the working piston of a clamp for fixing the tool to the rod and the second pressure line to the working piston for generation of the relative axial force.
  • the pressure relief valve thus limits the clamping force of the clamping pliers and also causes the working piston to generate the axial force only after the tool has sufficient force, i.e. non-slip, is fixed to the rod.
  • the invention is also based on the object of facilitating the disassembly and assembly of a tubular structure, the tubes of which are attached to the node connection by press fit.
  • This object is achieved by using the tool according to the invention for loosening or connecting the knot connection of a pipe construction, in which the pipe ends are press-fitted onto connecting pins of the knot connection, the clamping surfaces of the clamping pliers being adapted to the pipe circumference and on the working piston to generate the relative axial force claw-shaped, pivotable engagement head is provided.
  • the tool has to be attached to the rod in reverse and the engagement head has to be provided with a transmission bracket which grips the knot body with one of its ends.
  • the handle 2 which has a roughened surface, consists of a sleeve-shaped container which is screwed to the pump block 3 at its lower connecting piece 4 and which encloses the flexible storage container 5 for hydraulic oil. Its outer diameter is 30 mm, for example.
  • the pump lever 6 extends so that both can be gripped by one hand in order to exert the pumping movement against the force of a compression spring 7.
  • a control block 9 is fastened by means of screws 10, which comprises different bores running perpendicular or parallel to one another, which contain the hydraulic channels 12-15, auxiliary bores 16 for their manufacture and two cylinder bores 18, 19 for working pistons 20 , 21, and the hook-shaped cross section at its upper end facing away from the handle 2 in order to form the fixed jaw 23 of the rod receptacle 24.
  • the engagement head 26 At the front end of the pistol-shaped or hammer-shaped tool 1 there is the engagement head 26, which is intended for engagement on the body, not shown, which can be moved axially relative to the rod.
  • the rod holder 24 When using the tool 1, the rod holder 24 pushed in the direction transverse to the rod and brought into the position required for the working movement by any necessary axial displacement on the rod. Since the lateral opening 27 for the lateral insertion of the rod is narrower than the rod diameter for a largely form-fitting encirclement of the circular cross section of the rod or tube, the lower jaw 28 of the rod receptacle 24 is counter to the force of at least one compression spring 29 for further opening thereof Opening 27 can be moved by the counterpressure of the rod when the tool is pressed on. This sliding movement directed transversely to the rod receptacle is guided by at least one guide pin 30 which is enclosed by the compression spring 29.
  • adapter shells 31, 32 can be inserted into the rod receptacle, which are fastened to their outer flange 33 by means of screws 34.
  • the movable jaw 28 of the rod holder can be pressed against the rod by the working piston 20 guided in the larger cylinder bore 18 and thus against the fixed half 23 of the rod holder 24.
  • a filling lever 37 is previously pivoted into the space 38 between the lower jaw 28 of the rod receptacle 24 and an actuating shaft 39 of the working piston 20, which is responsible for the aforementioned sliding movement when it is pressed on from the side of tool 1 on the rod is required.
  • a stroke movement of the working piston 20 of only 1 mm or less is sufficient to generate the clamping force on the rod.
  • Fig. 4 shows by supervision of the filling lever 37 which, after swiveling into the position according to FIGS. 1 and 2, via the actuating shaft 39 of the working piston 20, the lever extension 40, the handle end 41 of the filling lever and a recess 42 for enclosing one of the guide pins 30 between the the lever extension 40 swings in. 2 shows the pivotable mounting of the filling lever on a screw shaft 43, which also presses the filling lever 37 by means of its head 44 against the control block 9 via a set of spring washers or plate springs 45, so that the latter can be raised by the lifting movement of the working piston 20 to transfer this to the movable jaw 28 of the rod receptacle 24.
  • Fig. 3 shows the filling lever 37 in the outwardly pivoted position, so that the lower jaw 28 of the rod holder can spring back when the tool 1 is placed on the rod.
  • the engagement head 26 is designed as a pivotable claw in order to be able to pivot it in from a release position over the rod, so that its U-shaped recess 48 encloses the rod on one side. In this way, the engagement head 26 obstructs not placing the tool 1 on the rod.
  • the engaging head 26 is permanently attached, for example by a press fit, to the outer end of the working piston 21, so that the working piston 21 simultaneously forms the pivot axis of the engaging head 26.
  • the axially outer end 49 of the engagement head 26 tapers outwards, so that it can engage between rods of a rod or tube construction running at an acute angle to one another in order to be supported on the node body.
  • the tool 1 After the tool 1 has been placed on the rod and the engagement head 26 has also been pivoted in via it, the tool 1 is displaced on the rod until the contact surface 47 abuts the body to be pressed off or displaced relative to the rod. Then the pump lever 6 is actuated so that the pump piston 36 attached to it via the axis 50 sucks hydraulic oil from the storage tank 5 due to its reciprocating movement in the cylinder bore 51 and after opening the pump valve 52 via the bore 53 against the first and larger one Working piston 20 presses.
  • the pressure relief valve 56 in the hydraulic channel 12-14 opens at a certain pressure which can be set by the screw 55 second, smaller in diameter working piston 21 is acted upon by this pressure so that it pushes the engaging head 26 outwards in order to carry out the desired working movement.
  • the maximum length of the working movement of the working piston 21 is limited by a guide shaft 58 enclosed by the latter with a stop and guide head 59, which comes to a stop on an inner shoulder 60 of the hollow working piston 21.
  • This head 59 of the guide shaft 58 screwed to the control block 9 is an inner piston formed with a seal 62.
  • a seal 30 held in the wall of the cylinder bore 19 seals the hollow working piston 21 from the outside, so that the hydraulic oil acting on the working piston 21 on one side via the hydraulic channel 12-14 and an annular channel 64 moves the working piston 21 against the pressure of the spring 65 enclosed in it .
  • a pressure relief valve 66 is opened manually by actuating a knurled screw 67, which is located in the pump pressure line, i.e. the bore 53 with the bypass channel 69 connecting the storage tank 5 is located so that both working pistons 20, 21 move back to their starting position under the pressure of their return springs 70, 65 and accordingly the hydraulic oil flows back into the expandable storage tank 5.
  • the storage container is preferably designed as a variable-length bellows made of rubber-elastic material, so that no air enters it and it can carry out a filling and emptying movement.
  • the pump suction valve 73, the pump pressure valve, the pressure relief valve 56 and the backflow valve 72 are designed in the usual way as spring-loaded check valves with a closing body designed as a ball.
  • Various locking screws 55, 74, 75 and 76 hold the valves or their spring in the associated hydraulic channel.
  • the tool is placed on the rod end in such a way that the engaging head 26 is directed away from the rod end and uses an unillustrated bridging bar, the inward-facing two ends of which on the one hand enclose the body to be drawn on and on the other hand engage the engaging head 26.
  • at least one end of the transmission bracket is claw-shaped, similar to the engagement head.
  • a bridging bar could, however, also be pivotably attached to the outer end of the working piston instead of the engagement head 26, or be exchangeable with it, so that it can be pivoted in behind the body to be pulled towards the rod end, ie the node body.
  • the outside diameter of the pipes of conventional pipe constructions of the type mentioned with interior design application is in the range from 13 to 19 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Eye Examination Apparatus (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Earth Drilling (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
EP88810091A 1987-02-19 1988-02-15 Werkzeug zur Erzeugung einer Axialkraft Expired - Lifetime EP0280649B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810091T ATE68390T1 (de) 1987-02-19 1988-02-15 Werkzeug zur erzeugung einer axialkraft.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH613/87 1987-02-19
CH613/87A CH672088A5 (ja) 1987-02-19 1987-02-19

Publications (2)

Publication Number Publication Date
EP0280649A1 EP0280649A1 (de) 1988-08-31
EP0280649B1 true EP0280649B1 (de) 1991-10-16

Family

ID=4191070

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810091A Expired - Lifetime EP0280649B1 (de) 1987-02-19 1988-02-15 Werkzeug zur Erzeugung einer Axialkraft

Country Status (5)

Country Link
EP (1) EP0280649B1 (ja)
AT (1) ATE68390T1 (ja)
CH (1) CH672088A5 (ja)
DE (1) DE3865455D1 (ja)
DK (1) DK166605B1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005081620A3 (en) * 2004-02-24 2007-11-08 Lokring Technology Corp Hydraulic hand tool

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016008882A1 (de) * 2016-07-20 2018-01-25 Hydac Technology Gmbh Spannzylindervorrichtung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296687A (en) * 1964-08-03 1967-01-10 Acf Ind Inc Valve servicing machine
DD129033B1 (de) * 1976-11-15 1980-12-24 Otto Degenhardt Schaltungsanordnung zum fuegen und loesen von pressverbaenden
CA1113228A (en) * 1979-11-30 1981-12-01 Joseph Altmayer Portable hydraulic gear pulling device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005081620A3 (en) * 2004-02-24 2007-11-08 Lokring Technology Corp Hydraulic hand tool
US7337514B2 (en) 2004-02-24 2008-03-04 Lokring Technology, Llc Hydraulic hand tool

Also Published As

Publication number Publication date
DK84788D0 (da) 1988-02-18
DK84788A (da) 1988-08-20
EP0280649A1 (de) 1988-08-31
ATE68390T1 (de) 1991-11-15
CH672088A5 (ja) 1989-10-31
DK166605B1 (da) 1993-06-21
DE3865455D1 (de) 1991-11-21

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