EP0232768A1 - Pompe hydraulique manuelle pour le sertissage de cosses sur câbles, ou pour d'autres outils hydrauliques - Google Patents

Pompe hydraulique manuelle pour le sertissage de cosses sur câbles, ou pour d'autres outils hydrauliques Download PDF

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Publication number
EP0232768A1
EP0232768A1 EP87100919A EP87100919A EP0232768A1 EP 0232768 A1 EP0232768 A1 EP 0232768A1 EP 87100919 A EP87100919 A EP 87100919A EP 87100919 A EP87100919 A EP 87100919A EP 0232768 A1 EP0232768 A1 EP 0232768A1
Authority
EP
European Patent Office
Prior art keywords
pressure
low
pressure cylinder
cylinder
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.)
Withdrawn
Application number
EP87100919A
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German (de)
English (en)
Inventor
Helmut Dipl.-Ing. Dischler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0232768A1 publication Critical patent/EP0232768A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042—Hand tools for crimping
    • H01R43/0427—Hand tools for crimping fluid actuated hand crimping tools

Definitions

  • the invention relates to a hydraulic hand pump for actuating cable lug presses and other hydraulic tools.
  • hand pumps are known per se. If the use of mechanically driven pumps is not possible or is not worthwhile, they serve to use hydraulic tools with pressure medium, usually a hydraulic fluid.
  • the tools which usually contain a piston-cylinder arrangement, can be tools that are used, for example, for cutting, punching or riveting or for deforming workpieces, for example cable lugs or sleeves to be pressed onto cables.
  • the hand pumps can be connected to the tools by high-pressure hose lines, attached to the tools or installed in them.
  • the hand pumps have to be simple and inexpensive to manufacture, and on the other hand, demands are placed on them that are difficult to reconcile with them. You have to withstand the relatively harsh influences to which they are exposed during transport and use. Excessive demands must not be placed on the physical strength required for actuation, but it must also not be necessary for numerous actuation processes before the action of the driven tool begins. The penetration of air into the pressure medium spaces of the pumps and the tools must be prevented, as well as the possibility of incorrect operation and, finally, painful pinching or even injuries to the hands of the operators must be excluded.
  • the invention has for its object to provide a hand pump that meets the above requirements.
  • the invention relates to a hydraulic hand pump for actuating cable shoe presses and other hydraulic tools, which is characterized by a low-pressure cylinder that can be connected to a pressure medium supply, a high-pressure cylinder that can be connected to the pressure medium supply to the tool, which has a smaller cross-section than the low-pressure cylinder, and one that is longitudinally movable relative to these cylinders Piston, which reduces the volume of the low-pressure cylinder in one direction of movement and increases the volume of the high-pressure cylinder and, in the opposite direction of movement, increases the volume of the low-pressure cylinder and that of the high-pressure cylinder.
  • the pump according to the invention can be designed such that a bore arranged in the movable low-pressure piston serves as a high-pressure cylinder, into which a fixed piston is immersed.
  • the low-pressure piston and the high-pressure piston can be formed in one piece and be displaceable in the low-pressure and high-pressure cylinders arranged in the housing, the displacement likewise taking place by means of the hand lever.
  • a particularly uncomplicated and inexpensive to manufacture embodiment of the pump can be achieved if the cylinders are arranged coaxially.
  • a prefill valve designed as a check valve and a low-pressure safety valve acting in the opposite direction between the pressure medium supply and the low-pressure cylinder.
  • a prefill valve designed as a check valve and a low-pressure safety valve acting in the opposite direction between the pressure medium supply and the low-pressure cylinder.
  • a check valve is expediently arranged in the connection between the low-pressure cylinder and the high-pressure cylinder, so that pressure medium located in the high-pressure cylinder cannot flow back into the low-pressure cylinder.
  • a high-pressure valve at the pressure-medium outlet opening of the high-pressure cylinder, which prevents pressure medium located in the working space of the tool from flowing back into the high-pressure cylinder and possibly also into the low-pressure cylinder and into the pressure medium supply, as long as this is not desired.
  • the high pressure valve can be actuated either by the plunger via a pull rod or via a gear, as described for example in DE-PS 32 35 o4o, so that when the desired press stroke is reached, the high pressure valve opens and no more oil enters the Press cylinder arrives, which is noticeable on the operating lever by the back force occurring there.
  • the low-pressure piston can be displaced with the aid of two hand levers which are rotatably articulated on the pump housing and have crankings at a distance from their respective pivot point in order to be able to operate the pump close to the center of gravity.
  • the hand levers each have a hand protection angle at their free end in addition to handles which are located.
  • the pump thus has two active actuation levers, the handles and the hand protection angle serving both as protection, but also, if necessary, to be able to make small pumping movements with one hand.
  • actuation levers the handles and the hand protection angle serving both as protection, but also, if necessary, to be able to make small pumping movements with one hand.
  • a fixed tool 2 which is designed as an open angle, is attached to the housing of the press, designated in its entirety by 1.
  • a workpiece 3 to be pressed can be inserted into the open angle of this tool 2.
  • a press cylinder 4 is arranged in the housing 1, in which a press piston 5 can be displaced against the force of a return spring 6. when a pressure medium, for example a hydraulic fluid, is introduced into the press cylinder 4 at a sufficiently high pressure.
  • the plunger 5 is connected to a piston rod 7, at the free end of which a tool 8 is fastened, which can be pressed against the workpiece 3.
  • a low-pressure cylinder 9 in the housing 1, in which a low-pressure piston 10 is arranged, which can be displaced in the low-pressure cylinder 9 with the aid of hand levers 11.
  • the low-pressure piston 10 there is a concentric bore into which a high-pressure piston 12 dips so that it forms a boundary of a high-pressure cylinder 13 located in the low-pressure piston 10.
  • the head 14 of the high-pressure piston 12 is firmly connected to the housing 1.
  • a pressure medium reservoir 15 is arranged on the housing 1.
  • the elastic walls 16 of which enclose the pressure medium supply 17. Pressurized air or another gas or the normal pressure of the air can be located between the outer sides of the elastic walls 16 and the inner wall of the pressure medium reservoir 15.
  • the pressure medium supply 17 is connected to the low pressure cylinder 9 via a prefill valve 18 designed as a check valve, so that pressure medium can get from the supply 17 into the low pressure cylinder 9.
  • the low-pressure cylinder 9 and the pressure medium supply 17 are connected to one another via a low-pressure safety valve 19. by which pressure medium can flow out of the low-pressure cylinder 9 into the pressure medium supply 17 when a predetermined pressure is exceeded.
  • the low-pressure cylinder 9 is connected to the high-pressure cylinder 13 via a bore arranged in the low-pressure piston 1o, in which there is a spring-loaded check valve 2o, which prevents the transfer of pressure medium from the high-pressure cylinder 13 into the low-pressure cylinder 9.
  • the high pressure cylinder 13 is connected to the press cylinder 4 via a bore 21 in the high pressure piston 12 and a high pressure valve 22.
  • a channel 23 leads from the press cylinder 4 to a spring-loaded high-pressure safety valve 24, which can also be used as a drain valve by actuating a release button 25 and returns pressure medium to the pressure medium supply 17.
  • the hand levers 11 are cranked at a distance from their pivot points at 28. They can be gripped between the cranks 28 and the handles attached to their ends with the hands of the operator and moved against each other, which will be the case especially when only small forces are required to actuate the hand lever 11. As a result of the offset 28, the distance between the hand levers 11 and the housing 1 or the pressure medium reservoir 15 always remains so large that the operator's fingers cannot become trapped.
  • the handles 26 of the hand levers 11 are fastened to this hand protection bracket 27, by means of which the operator's fingers placed around the handles 26 can be prevented from striking against one another when the hand levers 11 are pressed together. They also serve to operate both levers with one hand so that the other hand is free when pressing the workpiece 3.
  • the handles 26 serve to open the levers 11 when the fingers are spread.
  • the low-pressure piston 11o and the high-pressure piston 112 are firmly connected to one another and can be moved together by means of the hand lever 11.
  • the high pressure cylinder is located above the end face of the high pressure piston 112 and is designated 113 in FIG. It is connected to the press cylinder 4 via the high-pressure valve, designated 122 here.
  • the volume of the high-pressure cylinder 13 is reduced and the pressure medium located in it passes through the bore 21 and via the high-pressure valve 22 into the press cylinder 4. It is therefore initially with each opening and each Closing movement of the hand lever 11 promotes pressure medium in the press cylinder 4 and thereby the press piston 5 moves in the direction of the workpiece 3.
  • the high-pressure cylinder 13 has a substantially smaller cross-section than the low-pressure cylinder 9, when the hand lever 11 is pressed together, the pressure in the high-pressure cylinder 1 is so high that the high-pressure valve 22 is opened and the pressure medium flows into the press cylinder 4 in which such a high pressure Pressure is built up so that the movable tool 8 connected to the plunger penetrates into the workpiece 3 and, when the opening and closing movement of the hand lever 11 is repeated, deforms it in the desired manner.
  • the high-pressure safety valve 24 can be opened by actuating the release button 25, so that pressure fluid from the press cylinder 4 into the Pressure medium supply 17 is returned and the plunger 5 is reset by the force of the return spring 6.
  • An unwanted actuation of the release button 25 arranged on the bottom of the pressure medium reservoir is precluded by the fact that the hands of the operator, which include the handles 26, are prevented by the hand protection bracket 27 from sliding into the area of the release button 25.
  • the high-pressure safety valve 24 also prevents the build-up of an impermissibly high pressure in the press cylinder 4.
  • the high-pressure cylinder 113 is not arranged within the low-pressure piston designated 11o there, but in the housing 1 and the high-pressure piston 112 is fixedly connected to the low-pressure piston 11o and can be moved together with it.
  • the high-pressure valve 22 or 122 can be actuated not only, as shown in FIG. 1, by the direct action of the press piston 5, but also by a gear arranged between the press piston and the press cylinder, as described in DE-PS 32 35 o4o is.
  • the particular advantage of actuating the valve 22 by piston 5 via the pull rod (release rod) 3o or with a transmission according to DE-PS 32 35 o4o is that when the ge is reached Desired press stroke this valve 22 is opened and no more oil can get into the cylinder 4. In this state, the hand levers are pushed apart by the oil flowing back with approximately the same force with which oil was previously pumped into the cylinder. The operator immediately recognizes that the pressing process has ended. In addition, the operator only needs to apply as much force as the workpiece requires. Furthermore, the entire tool is protected because only the pressure that is currently required is built up.
  • the pump according to the invention can not only be installed in a tool as described in the exemplary embodiment, it can also be attached to a tool or can be connected to a tool by means of a hose or another line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Press Drives And Press Lines (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)
  • Portable Power Tools In General (AREA)
  • Reciprocating Pumps (AREA)
  • Fluid-Pressure Circuits (AREA)
EP87100919A 1986-02-01 1987-01-23 Pompe hydraulique manuelle pour le sertissage de cosses sur câbles, ou pour d'autres outils hydrauliques Withdrawn EP0232768A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3603109 1986-02-01
DE19863603109 DE3603109A1 (de) 1986-02-01 1986-02-01 Hydraulische handpumpe zum betaetigen von kabelschuhpressen und anderen hydraulischen werkzeugen

Publications (1)

Publication Number Publication Date
EP0232768A1 true EP0232768A1 (fr) 1987-08-19

Family

ID=6293159

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87100919A Withdrawn EP0232768A1 (fr) 1986-02-01 1987-01-23 Pompe hydraulique manuelle pour le sertissage de cosses sur câbles, ou pour d'autres outils hydrauliques

Country Status (3)

Country Link
EP (1) EP0232768A1 (fr)
JP (1) JPS62255077A (fr)
DE (1) DE3603109A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720199A (en) * 1993-08-05 1998-02-24 Dischler; Helmut Tool for transforming work pieces

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0419810B1 (fr) * 1989-09-28 1993-09-22 FAG Kugelfischer Georg Schäfer Aktiengesellschaft Groupe moteur-pompe
JP2547230Y2 (ja) * 1991-05-15 1997-09-10 日東工器株式会社 油圧作動機
NL1014253C2 (nl) * 2000-02-01 2001-08-02 Holmatro Ind Equip Hydraulisch gereedschap.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836702A1 (de) * 1977-08-22 1979-03-08 Izumi Prod Co Hydraulisches presswerkzeug
GB2012641A (en) * 1978-01-16 1979-08-01 Burndy Corp Electrical calbe connector tools
DE3033723A1 (de) * 1980-09-08 1981-03-26 Nowikontakt AB, Tragsund Hydraulisch betriebenes klemmwerkzeug
DE3235040A1 (de) * 1982-09-22 1984-03-22 Helmut Dipl.-Ing. 4040 Neuss Dischler Presse zum aufpressen von huelsen, kabelschuhen oder dergleichen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB960582A (en) * 1959-07-10 1964-06-10 Power Jacks Ltd Improvements in or relating to reciprocating hydraulic pumps
US3006281A (en) * 1960-07-08 1961-10-31 Delaney John Joseph Hydraulic pump unit
NL6817090A (fr) * 1968-11-29 1970-06-02
JPS5519899B1 (fr) * 1970-09-30 1980-05-29
FR2220699B1 (fr) * 1973-03-09 1978-03-10 Commissariat Energie Atomique
US3844534A (en) * 1973-06-04 1974-10-29 Applied Power Inc Lightweight hydraulic jack
US4357798A (en) * 1980-03-13 1982-11-09 Michael Hung Rapid actuating device of hydraulic actuator
DE3339455A1 (de) * 1983-10-31 1985-05-09 P.A. Rentrop Hubbert & Wagner Fahrzeugausstattungen GmbH & Co KG, 3060 Stadthagen Von hand betaetigbare, hydraulische kolbenpumpe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836702A1 (de) * 1977-08-22 1979-03-08 Izumi Prod Co Hydraulisches presswerkzeug
GB2012641A (en) * 1978-01-16 1979-08-01 Burndy Corp Electrical calbe connector tools
DE3033723A1 (de) * 1980-09-08 1981-03-26 Nowikontakt AB, Tragsund Hydraulisch betriebenes klemmwerkzeug
DE3235040A1 (de) * 1982-09-22 1984-03-22 Helmut Dipl.-Ing. 4040 Neuss Dischler Presse zum aufpressen von huelsen, kabelschuhen oder dergleichen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720199A (en) * 1993-08-05 1998-02-24 Dischler; Helmut Tool for transforming work pieces

Also Published As

Publication number Publication date
JPS62255077A (ja) 1987-11-06
DE3603109A1 (de) 1987-08-06

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