EP0794039A1 - Pliers with two arms made from moulded plastic - Google Patents

Pliers with two arms made from moulded plastic Download PDF

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Publication number
EP0794039A1
EP0794039A1 EP96103123A EP96103123A EP0794039A1 EP 0794039 A1 EP0794039 A1 EP 0794039A1 EP 96103123 A EP96103123 A EP 96103123A EP 96103123 A EP96103123 A EP 96103123A EP 0794039 A1 EP0794039 A1 EP 0794039A1
Authority
EP
European Patent Office
Prior art keywords
pliers
rotation
axis
pliers according
metal
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.)
Granted
Application number
EP96103123A
Other languages
German (de)
French (fr)
Other versions
EP0794039B1 (en
Inventor
Hermann J. Zerver
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.)
Hazet Werk Hermann Zerver GmbH and Co KG
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Hazet Werk Hermann Zerver GmbH and Co KG
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 Hazet Werk Hermann Zerver GmbH and Co KG filed Critical Hazet Werk Hermann Zerver GmbH and Co KG
Priority to EP96103123A priority Critical patent/EP0794039B1/en
Priority to AT96103123T priority patent/ATE186864T1/en
Priority to DE59603713T priority patent/DE59603713D1/en
Priority to ES96103123T priority patent/ES2139968T3/en
Publication of EP0794039A1 publication Critical patent/EP0794039A1/en
Application granted granted Critical
Publication of EP0794039B1 publication Critical patent/EP0794039B1/en
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
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • 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
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/20—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same inserting or withdrawing split pins or circlips
    • B25B27/205—Pliers or tweezer type tools with tow actuated jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/10—Handle constructions characterised by material or shape
    • B25G1/12—Handle constructions characterised by material or shape electrically insulating material

Definitions

  • the invention relates to pliers with two pliers halves made of plastic molded bodies, which are pivotally connected to one another via a trade and one end of which is shaped as a handle and the other ends of which are provided with a functional element which is made of metal and which protrudes from the molded body and corresponds to the intended use , wherein both functional elements are arranged in the same plane of movement.
  • Such pliers with two functional elements pivotable in a common movement plane are used, for example, to open circlips.
  • a generic pliers is known from EP 0 624 433 A1. Both pliers halves each consist of plastic moldings, in the ends of which tool tips made of metal are cast in order to spread or compress locking rings. Apart from a locking screw, these pliers are made entirely of plastic.
  • the invention has for its object to provide a lightweight pliers, which shows only a slight tendency to twist even with high actuation forces.
  • the functional element is an integral part of a metal insert embedded in the molded body and largely enclosed by it, that both metal inserts, starting from the functional element, extend to at least the trade, and at least one of the two metal inserts is provided with a hole in which the axis of rotation of the trade is mounted.
  • Such pliers are particularly lightweight and can be produced inexpensively by using molded articles made of plastic.
  • the metal inserts with the functional elements are inserted into the injection mold before the plastic injection molding, and then largely enclosed by the plastic during the injection molding process.
  • the metal inserts bring about a targeted reinforcement of the pliers halves in the section between the functional element and the trade, and in this way sufficient statics to transmit the actuating forces generated by the handles to the functional element.
  • the pliers are specifically strengthened in the section in which the greatest movement precision is required.
  • a metal insert with the bore and the other metal insert with a non-round opening such as. B. a polygonal opening
  • the axis of rotation extends through the bore and opening at the same time and it is rotatably fixed with respect to the opening by means of fitting surfaces adapted to the opening.
  • the axis of rotation can be provided at one end with a radial extension forming an axial bearing surface, the radial bearing surface of the axis of rotation arranged in the bore being located between this axial bearing surface and the mating surfaces.
  • a further embodiment of the pliers proposes that an axial bearing surface concentrically surrounding the axis of rotation is formed on each of the two metal inserts, which lies against the other axial bearing surface.
  • the metal inserts serve to improve the statics of the pliers when force is applied via the handles, furthermore to increase the strength of the pliers against twisting of the pliers halves, and finally to reduce the friction and wear in the area of the pliers.
  • the metal inserts therefore do not need to be visible from the outside, which is why it is proposed with a further development that the metal inserts are so far embedded in the plastic moldings that only the functional elements and annular areas around the axis of rotation, including the axial bearing surfaces, are not covered by plastic .
  • axial bearing surfaces designed as annular elevations are formed on the metal inserts around the axis of rotation. If the metal insert consists of a stamped metal piece, the ring-shaped elevations can be produced by cold-working the area around the later axis of rotation.
  • the production of the metal insert as a stamped part is desirable for reasons of production costs, in which case the functional element is welded to the stamped part. With regard to the strength of the weld, it has proven to be advantageous here if the stamped part and the functional element are connected by a TIG welding process without welding filler.
  • the pliers halves are made of polyamide, in which the respective metal insert is positively embedded during the spraying process.
  • fiber reinforcement of the polyamide used is possible.
  • the pliers shown in Figures 1 and 2 in plan view and side view consists of two pliers halves 2, 3 connected to each other via a trade 1, from the ends of which functional elements 4 protrude.
  • the functional elements, each running out in a pin, serve to grip the ends of commercially available circlips.
  • Both pliers halves 2, 3 consist predominantly of a molded body made of glass fiber reinforced polyamide.
  • Pins 7 are formed on the inside of the handles 5, 6 of the pliers halves 1, 2, between which a spring element 8 can be inserted. Extensions 7a of the pin end in the manner of barbs prevent the spring element 8 from accidentally coming loose.
  • a metal insert 9, 10 is embedded in the plastic material of each pliers half 2, 3, as can be seen in FIGS. 5 and 6.
  • the metal insert 9, 10 is a flat stamped part which is connected at one end to the functional element 4.
  • a TIG welding process without welding additives has proven to be suitable.
  • FIGS. 5 and 6 also show that only the end of the functional element 4 that is important for working with the pliers protrudes from the molded body of the respective pliers half 2, 3, but otherwise a part of the functional element 4 and the complete metal insert 9, 10 in the Plastic molded body is embedded.
  • the metal insert 9, 10 encloses with an opening 11 or bore 12 the axis of rotation of the trade 1, so that there is a rigid metallic connection from the top of the functional element 4 to the trade 1.
  • each of the two metal inserts 9, 10 is provided with an extension 13 beyond the area of the trade 1, which extends into the beginning of the respective handle 5, 6.
  • the length of the extensions 13 is such that they extend into the first third of the length L of the grip area of the handles 5, 6.
  • FIG. 3 shows the metal insert 9 provided with a round bore 12, however the following explanations apply equally to the other half of the pliers with the metal insert 10.
  • the metal insert 9 is provided in the area of the trade 1 with a depression 14 which in turn is provided with an annular elevation 15 around the axis of rotation of the trade.
  • the annular elevation 15 forms on its upper side a flat axial bearing surface 16 which concentrically surrounds the bore 12 and thus the axis of rotation of the trade.
  • the axial bearing surface 16 is located exactly in the plane of movement B for the pivoting movement of the functional element 4.
  • the corresponding axial bearing surface 17 of the other pliers half 3 bears against the axial bearing surface 16, which is shown in detail in FIG. 4.
  • Fig. 3 also reveals that the metal insert 9 including the functional element 4 is embedded so far in the plastic molded body of the pliers half 2 that only the tip of the functional element 4 and annular areas around the axis of rotation including the axial bearing surface 16 remain free.
  • the metal insert already provided with the functional element is inserted into the injection mold when producing the pliers halves 2, 3, and then the liquid plastic is pressed into the mold so that it encloses the metal parts in the form mentioned.
  • the axis of rotation 18 is composed of a cylindrical section 19, a section 20 provided with mating surfaces and a radial extension 21 outside the metal inserts 9, 10.
  • the section 20 provided with mating surfaces projects through the opening 11 in the metal insert 10, while the cylindrical section 19 projects through the bore 12 in the metal insert 9.
  • the cylindrical section 19 is of slightly shorter length than the bore 12.
  • the mating surfaces 20 of the section 20 are matched to the shape of the opening 11 also having mating surfaces, so that the axis of rotation 18 is non-rotatable with respect to the metal insert 10.
  • the other metal insert 9 can rotate freely on the cylindrical section 19 of the axis of rotation 18 and therefore forms the actual hinge of the trade.
  • a securing screw 24 is screwed into the threaded axis of rotation 18 from the other side. Since the axis of rotation 18 is held in the metal insert 10 in a rotationally fixed manner, no relative movement and therefore also no friction can occur on the locking screw 24, which is why the axis of rotation 18 and locking screw 24 are self-locking.
  • the radial support of the swivel joint takes place, on the one hand, by means of the axial bearing surfaces 16, 17 of the two metal inserts 9, 10 lying against one another and, on the other hand, by means of a further axial bearing surface 22, which is located on the radial extension 21 of the axis of rotation 18.
  • This axial bearing surface 22 is supported flatly on the rear side 23 of the annular elevation 15 of the metal insert 9.
  • the axis of rotation 18 and the locking screw 24 therefore form an abutment for the axial forces and the torsional forces in the trade 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Mechanical Control Devices (AREA)
  • Scissors And Nippers (AREA)

Abstract

Novel pliers are made in two halves (1, 2) using plastic mouldings, pivoting at a joint (1). The new pliers have plastic handle mouldings (5, 6). The jaws (4) project from the mouldings and are metal, in a form corresponding to their application. They move in a common plane (B). The jaws are one-piece metal insert (9, 10), and are embedded in the mouldings, largely surrounded. They go back at least to the joint, and have a hole (12) in which the pivot (18) of the joint is mounted.

Description

Die Erfindung betrifft eine Zange mit zwei Zangenhälften aus Kunststoff-Formkörpern, die über ein Gewerbe verschwenkbar miteinander verbunden sind und deren eine Enden als Handgriff geformt und deren andere Enden mit einem dem jeweiligen Einsatzzweck entsprechenden, aus Metall bestehenden und aus dem Formkörper herausragenden Funktionselement versehen sind, wobei beide Funktionselemente in derselben Bewegungsebene angeordnet sind.The invention relates to pliers with two pliers halves made of plastic molded bodies, which are pivotally connected to one another via a trade and one end of which is shaped as a handle and the other ends of which are provided with a functional element which is made of metal and which protrudes from the molded body and corresponds to the intended use , wherein both functional elements are arranged in the same plane of movement.

Derartige Zangen mit zwei in einer gemeinsamen Bewegungsebene schwenkbaren Funktionselementen werden beispielsweise zum Öffnen von Sicherungsringen verwendet. Eine gattungsgemäße Zange ist aus der EP 0 624 433 A1 bekannt. Beide Zangenhälften bestehen jeweils aus Kunststoff-Formkörpern, in deren Enden Werkzeugspitzen aus Metall zum Spreizen oder Stauchen von Sicherungsringen eingegossen sind. Im übrigen besteht diese Zange mit Ausnahme einer Sicherungsschraube ausschließlich aus Kunststoff.Such pliers with two functional elements pivotable in a common movement plane are used, for example, to open circlips. A generic pliers is known from EP 0 624 433 A1. Both pliers halves each consist of plastic moldings, in the ends of which tool tips made of metal are cast in order to spread or compress locking rings. Apart from a locking screw, these pliers are made entirely of plastic.

Es hat sich allerdings herausgestellt, daß sich die beiden Zangenhälften dieser Zange gerade beim Aufbringen hoher Betätigungskräfte relativ stark verwinden. Dies beeinträchtigt die Grundfunktion der Zange.However, it has been found that the two pliers halves of these pliers twist relatively strongly, particularly when high actuation forces are applied. This affects the basic function of the pliers.

Der Erfindung liegt die Aufgabe zugrunde, eine leichtgewichtige Zange zu schaffen, welche selbst bei hohen Betätigungskräften eine nur geringe Verwindungsneigung zeigt.The invention has for its object to provide a lightweight pliers, which shows only a slight tendency to twist even with high actuation forces.

Zur Lösung wird bei einer Zange der eingangs genannten Art vorgeschlagen, daß das Funktionselement einstückiger Bestandteil eines in den Formkörper eingebetteten und von diesem größtenteils umschlossenen Metalleinsatzes ist, daß sich beide Metalleinsätze, ausgehend von dem Funktionselement, bis mindestens zu dem Gewerbe erstrecken, und daß zumindest einer der beiden Metalleinsätze mit einer Bohrung versehen ist, in der die Drehachse des Gewerbes gelagert ist.To solve the problem , it is proposed with pliers of the type mentioned at the outset that the functional element is an integral part of a metal insert embedded in the molded body and largely enclosed by it, that both metal inserts, starting from the functional element, extend to at least the trade, and at least one of the two metal inserts is provided with a hole in which the axis of rotation of the trade is mounted.

Eine solche Zange ist besonders leichtgewichtig und läßt sich durch Verwendung von Formkörpern aus Kunststoff preiswert herstellen. Die Metalleinsätze mit den Funktionselementen werden vor dem Kunststoffspritzguß in die Spritzform eingesetzt, und dann während des Spritzvorganges größtenteils von dem Kunststoff eingeschlossen. Die Metalleinsätze bewirken eine gezielte Verstärkung der Zangenhälften in dem Abschnitt zwischen Funktionselement und Gewerbe und auf diese Weise eine ausreichende Statik, um die über die Handgriffe erzeugten Betätigungskräfte auf das Funktionselement zu übertragen. Die Zange wird gezielt in jenem Abschnitt verstärkt, in welchem die größte Bewegungspräzision gefordert ist. Hingegen ist eine Verstärkung auch der Handgriffe der beiden Zangenhälften nicht erforderlich, da eine begrenzte Biegsamkeit hier nicht störend ist, und eine gegebenenfalls als störend empfundene Verwindung der beiden Zangenhälften relativ zueinander bereits durch den Metalleinsatz im Bereich des Gewerbes wirksam unterbunden wird.Such pliers are particularly lightweight and can be produced inexpensively by using molded articles made of plastic. The metal inserts with the functional elements are inserted into the injection mold before the plastic injection molding, and then largely enclosed by the plastic during the injection molding process. The metal inserts bring about a targeted reinforcement of the pliers halves in the section between the functional element and the trade, and in this way sufficient statics to transmit the actuating forces generated by the handles to the functional element. The pliers are specifically strengthened in the section in which the greatest movement precision is required. On the other hand, reinforcement of the handles of the two pliers halves is not necessary, since a limited flexibility is not a problem here, and any distortion of the two pliers halves relative to one another, which may be perceived as disturbing, is effectively prevented by the metal insert in the commercial sector.

Gemäß einer Weiterbildung der Zange wird vorgeschlagen, daß der eine Metalleinsatz mit der Bohrung und der andere Metalleinsatz mit einer nicht-runden Öffnung, wie z. B. einer Mehrkantöffnung, versehen ist, und daß die Drehachse Bohrung und Öffnung zugleich durchragt und sie mittels an die Öffnung angepaßter Paßflächen drehfest bezüglich der Öffnung ist. Die Drehachse kann an ihrem einen Ende mit einer eine axiale Lagerfläche bildenden, radialen Erweiterung versehen sein, wobei sich die in der Bohrung angeordnete radiale Lagerfläche der Drehachse zwischen dieser axialen Lagerfläche und den Paßflächen befindet. Auf diese Weise wird das Vorhandensein eines verstärkenden Metalleinsatzes zusätzlich dazu ausgenutzt, das Zangengewerbe spielfrei und verschleißarm zu lagern.According to a development of the pliers, it is proposed that a metal insert with the bore and the other metal insert with a non-round opening, such as. B. a polygonal opening, and that the axis of rotation extends through the bore and opening at the same time and it is rotatably fixed with respect to the opening by means of fitting surfaces adapted to the opening. The axis of rotation can be provided at one end with a radial extension forming an axial bearing surface, the radial bearing surface of the axis of rotation arranged in the bore being located between this axial bearing surface and the mating surfaces. In this way, the presence of a reinforcing metal insert is also used to store the pincer industry without play and with little wear.

Im Hinblick auf eine freie und verschleißfreie Lagerung wird mit einer weiteren Ausgestaltung der Zange vorgeschlagen, daß an jedem der beiden Metalleinsätze eine die Drehachse konzentrisch umgebende axiale Lagerfläche ausgebildet ist, welche an der jeweils anderen axialen Lagerfläche anliegt. Infolge des flächigen Kontaktes der beiden Lagerflächen tritt ferner eine Erhöhung der Verwindungsfestigkeit der Zange im Bereich des Zangengewerbes ein.With regard to free and wear-free storage, a further embodiment of the pliers proposes that an axial bearing surface concentrically surrounding the axis of rotation is formed on each of the two metal inserts, which lies against the other axial bearing surface. As a result of the two-dimensional contact between the two bearing surfaces, there is also an increase in the torsion resistance of the pliers in the area of the pliers industry.

Die Metalleinsätze dienen dazu, die Statik der Zange bei der Krafteinleitung über die Handgriffe zu verbessern, ferner die Festigkeit der Zange gegen ein Verwinden der Zangenhälften zu erhöhen, und schließlich die Reibung sowie den Verschleiß im Bereich des Zangengewerbes zu reduzieren. Die Metalleinsätze brauchen daher von außen nicht sichtbar zu sein, weshalb mit einer Weiterbildung vorgeschlagen wird, daß die Metalleinsätze soweit in die Kunststoff-Formkörper eingebettet sind, daß ausschließlich die Funktionselemente sowie ringförmige Bereiche rund um die Drehachse einschließlich der axialen Lagerflächen nicht von Kunststoff bedeckt sind.The metal inserts serve to improve the statics of the pliers when force is applied via the handles, furthermore to increase the strength of the pliers against twisting of the pliers halves, and finally to reduce the friction and wear in the area of the pliers. The metal inserts therefore do not need to be visible from the outside, which is why it is proposed with a further development that the metal inserts are so far embedded in the plastic moldings that only the functional elements and annular areas around the axis of rotation, including the axial bearing surfaces, are not covered by plastic .

Ferner wird vorgeschlagen, daß an den Metalleinsätzen rund um die Drehachse als ringförmige Erhebungen gestaltete axiale Lagerflächen angeformt sind. Sofern der Metalleinsatz aus einem gestanzten Metallstück besteht, können die ringförmigen Erhebungen durch Kaltverformung des Bereiches rund um die spätere Drehachse hergestellt werden.It is also proposed that axial bearing surfaces designed as annular elevations are formed on the metal inserts around the axis of rotation. If the metal insert consists of a stamped metal piece, the ring-shaped elevations can be produced by cold-working the area around the later axis of rotation.

Die Herstellung des Metalleinsatzes als Stanzteil ist aus Gründen der Produktionskosten angestrebt, wobei in diesem Fall das Funktionselement mit dem Stanzteil verschweißt ist. Hierbei hat es sich im Hinblick auf die Festigkeit der Verschweißung als vorteilhaft herausgestellt, wenn Stanzteil und Funktionselement durch ein WIG-Schweißverfahren ohne Schweißzusatz verbunden sind.The production of the metal insert as a stamped part is desirable for reasons of production costs, in which case the functional element is welded to the stamped part. With regard to the strength of the weld, it has proven to be advantageous here if the stamped part and the functional element are connected by a TIG welding process without welding filler.

Schließlich wird vorgeschlagen, daß die Zangenhälften aus Polyamid hergestellt sind, in das der jeweilige Metalleinsatz während des Spritzvorganges formschlüssig eingebettet wird. Zur Erhöhung der Festigkeit im Bereich der Handgriffe ist eine Faserverstärkung des verwendeten Polyamids möglich.Finally, it is proposed that the pliers halves are made of polyamide, in which the respective metal insert is positively embedded during the spraying process. To increase the strength in the area of the handles, fiber reinforcement of the polyamide used is possible.

Auf der Zeichnung ist ein Ausführungsbeispiel einer erfindungsgemäßen Zange dargestellt, und zwar zeigen darin:

Fig. 1
in einer Gesamtansicht eine Zange,
Fig. 2
eine Seitenansicht der Zange,
Fig. 3
einen Schnitt durch einen Teil einer der beiden Zangenhälften,
Fig. 4
einen Schnitt durch das Gewerbe der vollständigen Zange,
Fig. 5
eine teilweise geschnittene Ansicht der einen Zangenhälfte und
Fig. 6
eine teilweise geschnittene Ansicht der anderen Zangenhälfte.
An exemplary embodiment of a pair of pliers according to the invention is shown in the drawing, which show:
Fig. 1
in a general view a pair of pliers,
Fig. 2
a side view of the pliers,
Fig. 3
a section through part of one of the two pliers halves,
Fig. 4
a section through the trade of the complete pliers,
Fig. 5
a partially sectioned view of a pair of pliers and
Fig. 6
a partially sectioned view of the other half of the pliers.

Die in den Figuren 1 und 2 in Draufsicht und Seitenansicht dargestellte Zange besteht aus zwei über ein Gewerbe 1 miteinander verbundenen Zangenhälften 2, 3, aus deren Enden Funktionselemente 4 herausragen. Die jeweils in einem Zapfen auslaufenden Funktionselemente dienen dazu, die Enden handelsüblicher Sicherungsringe zu ergreifen.The pliers shown in Figures 1 and 2 in plan view and side view consists of two pliers halves 2, 3 connected to each other via a trade 1, from the ends of which functional elements 4 protrude. The functional elements, each running out in a pin, serve to grip the ends of commercially available circlips.

Beide Zangenhälften 2, 3 bestehen ganz überwiegend aus einem Formkörper aus glasfaserverstärktem Polyamid. An den Innenseiten der Handgriffe 5, 6 der Zangenhälften 1, 2 sind Zapfen 7 angeformt, zwischen denen sich ein Federelement 8 einsetzen läßt. Erweiterungen 7a des Zapfenendes nach Art von Widerhaken verhindern, daß sich das Federelement 8 versehentlich löst.Both pliers halves 2, 3 consist predominantly of a molded body made of glass fiber reinforced polyamide. Pins 7 are formed on the inside of the handles 5, 6 of the pliers halves 1, 2, between which a spring element 8 can be inserted. Extensions 7a of the pin end in the manner of barbs prevent the spring element 8 from accidentally coming loose.

In das Kunststoffmaterial jeder Zangenhälfte 2, 3 wird jeweils ein Metalleinsatz 9, 10 eingebettet, wie die Figuren 5 und 6 erkennen lassen. Bei dem Metalleinsatz 9, 10 handelt es sich um ein flaches Stanzteil, welches an seinem einen Ende mit dem Funktionselement 4 verbunden ist. Als Verbindungstechnik zwischen dem gehärteten Funktionselement 4 und dem nicht wärmebehandelten Metalleinsatz 9, 10 hat sich ein WIG-Schweißverfahren ohne Schweißzusätze als geeignet herausgestellt.A metal insert 9, 10 is embedded in the plastic material of each pliers half 2, 3, as can be seen in FIGS. 5 and 6. The metal insert 9, 10 is a flat stamped part which is connected at one end to the functional element 4. As a connection technique between the hardened functional element 4 and the non-heat-treated metal insert 9, 10, a TIG welding process without welding additives has proven to be suitable.

Die Figuren 5 und 6 lassen ferner erkennen, daß ausschließlich das für das Arbeiten mit der Zange wichtige Ende des Funktionselementes 4 aus dem Formkörper der jeweiligen Zangenhälfte 2, 3 herausragt, ansonsten jedoch ein Teil des Funktionselements 4 sowie der vollständige Metalleinsatz 9, 10 in den Kunststoff-Formkörper eingebettet ist.FIGS. 5 and 6 also show that only the end of the functional element 4 that is important for working with the pliers protrudes from the molded body of the respective pliers half 2, 3, but otherwise a part of the functional element 4 and the complete metal insert 9, 10 in the Plastic molded body is embedded.

Der Metalleinsatz 9, 10 umschließt mit einer Öffnung 11 bzw. Bohrung 12 die Drehachse des Gewerbes 1, so daß sich eine starre metallische Verbindung von der Spitze des Funktionselementes 4 bis zu dem Gewerbe 1 ergibt. Darüber hinaus ist jeder der beiden Metalleinsätze 9, 10 über den Bereich des Gewerbes 1 hinaus mit einer Verlängerung 13 versehen, die sich bis in den Anfang des jeweiligen Handgriffes 5, 6 hinein erstreckt. Die Länge der Verlängerungen 13 ist dergestalt, daß diese bis in das erste Drittel der Länge L des Griffbereiches der Handgriffe 5, 6 ragen.The metal insert 9, 10 encloses with an opening 11 or bore 12 the axis of rotation of the trade 1, so that there is a rigid metallic connection from the top of the functional element 4 to the trade 1. In addition, each of the two metal inserts 9, 10 is provided with an extension 13 beyond the area of the trade 1, which extends into the beginning of the respective handle 5, 6. The length of the extensions 13 is such that they extend into the first third of the length L of the grip area of the handles 5, 6.

Anhand der Fig. 3 wird nunmehr die Gestaltung der Metalleinsätze 9 im Bereich des Gewerbes 1 erläutert. In Fig. 3 dargestellt ist der mit einer runden Bohrung 12 versehene Metalleinsatz 9, jedoch gelten die nachfolgenden Ausführungen für die andere Zangenhälfte mit dem Metalleinsatz 10 gleichermaßen. Der Metalleinsatz 9 ist im Bereich des Gewerbes 1 mit einer Einsenkung 14 versehen, die ihrerseits um die Drehachse des Gewerbes herum mit einer ringförmigen Erhebung 15 versehen ist. Die ringförmige Erhebung 15 bildet auf ihrer Oberseite eine ebene axiale Lagerfläche 16, die die Bohrung 12 und damit die Drehachse des Gewerbes konzentrisch umgibt. Die axiale Lagerfläche 16 befindet sich exakt in der Bewegungsebene B für die Schwenkbewegung des Funktionselementes 4. An der axialen Lagerfläche 16 liegt die korrespondierende axiale Lagerfläche 17 der anderen Zangenhälfte 3 an, was im einzelnen in Fig. 4 dargestellt ist.The design of the metal inserts 9 in the area of trade 1 will now be explained with reference to FIG. 3. 3 shows the metal insert 9 provided with a round bore 12, however the following explanations apply equally to the other half of the pliers with the metal insert 10. The metal insert 9 is provided in the area of the trade 1 with a depression 14 which in turn is provided with an annular elevation 15 around the axis of rotation of the trade. The annular elevation 15 forms on its upper side a flat axial bearing surface 16 which concentrically surrounds the bore 12 and thus the axis of rotation of the trade. The axial bearing surface 16 is located exactly in the plane of movement B for the pivoting movement of the functional element 4. The corresponding axial bearing surface 17 of the other pliers half 3 bears against the axial bearing surface 16, which is shown in detail in FIG. 4.

Die Fig. 3 läßt ferner erkennen, daß der Metalleinsatz 9 einschließlich des Funktionselementes 4 soweit in den Kunststoff-Formkörper der Zangenhälfte 2 eingebettet ist, daß ausschließlich die Spitze des Funktionselementes 4 sowie ringförmige Bereiche rund um die Drehachse einschließlich der axialen Lagerfläche 16 freibleiben. Dies gilt in gleicher Weise für die andere Zangenhälfte 3. Zu diesem Zweck wird bei der Herstellung der Zangenhälften 2, 3 der bereits mit dem Funktionselement versehene Metalleinsatz in die Spritzform eingelegt, und dann der flüssige Kunststoff in die Form eingepreßt, so daß dieser die Metallteile in der genannten Form umschließt.Fig. 3 also reveals that the metal insert 9 including the functional element 4 is embedded so far in the plastic molded body of the pliers half 2 that only the tip of the functional element 4 and annular areas around the axis of rotation including the axial bearing surface 16 remain free. This applies in the same way to the other pliers half 3. For this purpose, the metal insert already provided with the functional element is inserted into the injection mold when producing the pliers halves 2, 3, and then the liquid plastic is pressed into the mold so that it encloses the metal parts in the form mentioned.

Anhand der Fig. 4 werden nunmehr Einzelheiten des Gewerbes 1 und der verwendeten Drehachse 18 aus Metall erläutert. Die Drehachse 18 setzt sich aus einem zylindrischen Abschnitt 19, einem mit Paßflächen versehenen Abschnitt 20 und einer radialen Erweiterung 21 außerhalb der Metalleinsätze 9, 10 zusammen. Der mit Paßflächen versehene Abschnitt 20 durchragt die Öffnung 11 in dem Metalleinsatz 10, während der zylindrische Abschnitt 19 die Bohrung 12 in dem Metalleinsatz 9 durchragt. Hierbei ist der zylindrische Abschnitt 19 von geringfügig kürzerer Länge als die Bohrung 12. Die Paßflächen 20 des Abschnittes 20 sind auf die Gestalt der ebenfalls Paßflächen aufweisenden Öffnung 11 abgestimmt, so daß die Drehachse 18 verdrehfest bezüglich des Metalleinsatzes 10 ist. Hingegen kann der andere Metalleinsatz 9 frei auf dem zylindrischen Abschnitt 19 der Drehachse 18 drehen, und bildet daher das eigentliche Drehgelenk des Gewerbes. Um ein Herausfallen der Drehachse 18 zu verhindern, ist eine Sicherungsschraube 24 von der anderen Seite aus in die mit einem Gewinde versehene Drehachse 18 eingeschraubt. Da die Drehachse 18 drehfest in dem Metalleinsatz 10 gehalten ist, kann keine Relativbewegung und damit auch keine Reibung an der Sicherungsschraube 24 auftreten, weshalb eine Selbstsicherung von Drehachse 18 und Sicherungsschraube 24 vorliegt.4 details of the trade 1 and the axis of rotation 18 used made of metal will now be explained. The axis of rotation 18 is composed of a cylindrical section 19, a section 20 provided with mating surfaces and a radial extension 21 outside the metal inserts 9, 10. The section 20 provided with mating surfaces projects through the opening 11 in the metal insert 10, while the cylindrical section 19 projects through the bore 12 in the metal insert 9. Here, the cylindrical section 19 is of slightly shorter length than the bore 12. The mating surfaces 20 of the section 20 are matched to the shape of the opening 11 also having mating surfaces, so that the axis of rotation 18 is non-rotatable with respect to the metal insert 10. On the other hand, the other metal insert 9 can rotate freely on the cylindrical section 19 of the axis of rotation 18 and therefore forms the actual hinge of the trade. In order to prevent the axis of rotation 18 from falling out, a securing screw 24 is screwed into the threaded axis of rotation 18 from the other side. Since the axis of rotation 18 is held in the metal insert 10 in a rotationally fixed manner, no relative movement and therefore also no friction can occur on the locking screw 24, which is why the axis of rotation 18 and locking screw 24 are self-locking.

Die radiale Abstützung des Drehgelenks erfolgt einerseits mittels der aneinanderliegenden axialen Lagerflächen 16, 17 der beiden Metalleinsätze 9, 10 und andererseits mittels einer weiteren axialen Lagerfläche 22, die sich an der radialen Erweiterung 21 der Drehachse 18 befindet. Diese axiale Lagerfläche 22 stützt sich flächig an der Rückseite 23 der ringförmigen Erhebung 15 des Metalleinsatzes 9 ab. Im Zusammenwirken bilden Drehachse 18 und Sicherungsschraube 24 daher ein Widerlager für die axialen Kräfte sowie die Torsionskräfte im Gewerbe 1.The radial support of the swivel joint takes place, on the one hand, by means of the axial bearing surfaces 16, 17 of the two metal inserts 9, 10 lying against one another and, on the other hand, by means of a further axial bearing surface 22, which is located on the radial extension 21 of the axis of rotation 18. This axial bearing surface 22 is supported flatly on the rear side 23 of the annular elevation 15 of the metal insert 9. In cooperation, the axis of rotation 18 and the locking screw 24 therefore form an abutment for the axial forces and the torsional forces in the trade 1.

BezugszeichenlisteReference list

11
GewerbeBusiness
22nd
erste Zangenhälftefirst half of the pliers
33rd
zweite Zangenhälftesecond half of the pliers
44th
FunktionselementFunctional element
55
erster Handgrifffirst handle
66
zweiter Handgriffsecond handle
77
ZapfenCones
7a7a
Erweiterung des ZapfenendesExtension of the tenon end
88th
FederelementSpring element
99
erster Metalleinsatzfirst metal insert
1010th
zweiter Metalleinsatzsecond metal insert
1111
Öffnungopening
1212th
Bohrungdrilling
1313
Verlängerungrenewal
1414
EinsenkungSinking
1515
ringförmige Erhebungring-shaped elevation
1616
axiale Lagerflächeaxial bearing surface
1717th
axiale Lagerflächeaxial bearing surface
1818th
DrehachseAxis of rotation
1919th
zylindrischer Abschnittcylindrical section
2020th
mit Paßflächen versehener Abschnittsection provided with mating surfaces
2121
radiale Erweiterungradial expansion
2222
axiale Lagerflächeaxial bearing surface
2323
Rückseiteback
2424th
SicherungsschraubeLocking screw
LL
Länge des HandgriffsHandle length
BB
BewegungsebenePlane of movement

Claims (12)

Zange mit Zangenhälften (1, 2) aus Kunststoff-Formkörpern, die über ein Gewerbe (1) verschwenkbar miteinander verbunden sind und deren eine Enden als Handgriff (5, 6) geformt und deren andere Enden mit einem dem jeweiligen Einsatzzweck entsprechenden, aus Metall bestehenden und aus dem Formkörper herausragenden Funktionselement (4) versehen sind, wobei beide Funktionselemente (4) in derselben Bewegungsebene (B) angeordnet sind,
dadurch gekennzeichnet,
daß das Funktionselement (4) einstückiger Bestandteil eines in den Formkörper eingebetteten und von diesem größtenteils umschlossenen Metalleinsatzes (9, 10) ist, daß sich beide Metalleinsätze (9, 10), ausgehend von dem Funktionselement (4), bis mindestens zu dem Gewerbe (1) erstrecken, und daß zumindest einer der beiden Metalleinsätze (9, 10) mit einer Bohrung (12) versehen ist, in der die Drehachse (18) des Gewerbes (1) gelagert ist.Pliers with pliers halves (1, 2) made of plastic moldings, which are pivotally connected to one another via a trade (1) and one end of which is shaped as a handle (5, 6) and the other ends of which are made of metal and correspond to the intended use and functional element (4) protruding from the molded body, both functional elements (4) being arranged in the same movement plane (B),
characterized by
that the functional element (4) is an integral part of a metal insert (9, 10) embedded in the molded body and largely surrounded by it, that both metal inserts (9, 10), starting from the functional element (4), at least to the trade ( 1), and that at least one of the two metal inserts (9, 10) is provided with a bore (12) in which the axis of rotation (18) of the trade (1) is mounted. Zange nach Anspruch 1, dadurch gekennzeichnet, daß der eine Metalleinsatz (9) mit der Bohrung (12) und der andere Metalleinsatz (10) mit einer nicht-runden Öffnung (11), wie z.B. einer Mehrkantöffnung, versehen ist, und daß die Drehachse (18) Bohrung (12) und Öffnung (11) zugleich durchragt und sie mittels an die Öffnung (11) angepaßter Paßflächen drehfest bezüglich der Öffnung (11) ist.Pliers according to claim 1, characterized in that one metal insert (9) with the bore (12) and the other metal insert (10) with a non-round opening (11), e.g. a polygonal opening is provided, and that the axis of rotation (18) extends through the bore (12) and the opening (11) at the same time and is rotatably fixed with respect to the opening (11) by means of fitting surfaces adapted to the opening (11). Zange nach Anspruch 2, dadurch gekennzeichnet, daß die Drehachse (18) an ihrem einen Ende mit einer eine axiale Lagerfläche (22) bildenden, radialen Erweiterung (21) versehen ist, und daß sich die in der Bohrung (12) angeordnete radiale Lagerfläche der Drehachse (18) zwischen dieser axialen Lagerfläche (22) und den Paßflächen der Öffnung (11) befindet.Pliers according to claim 2, characterized in that the axis of rotation (18) is provided at one end with a radial extension (21) forming an axial bearing surface (22), and in that the radial bearing surface arranged in the bore (12) Axis of rotation (18) between this axial bearing surface (22) and the mating surfaces of the opening (11). Zange nach Anspruch 3, dadurch gekennzeichnet, daß die Drehachse (18) an ihrem anderen Ende mit einer Sicherungsschraube (24) versehen ist.Pliers according to claim 3, characterized in that the axis of rotation (18) is provided at its other end with a locking screw (24). Zange nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß an jedem der beiden Metalleinsätze (9, 10) eine die Drehachse (18) konzentrisch umgebende axiale Lagerfläche (16 bzw. 17) ausgebildet ist, welche an der jeweils anderen axialen Lagerfläche (17 bzw. 16) anliegt.Pliers according to one of the preceding claims, characterized in that on each of the two metal inserts (9, 10) an axial bearing surface (16 or 17) concentrically surrounding the axis of rotation (18) is formed, which on the other axial bearing surface (17 or 16) is present. Zange nach Anspruch 5, dadurch gekennzeichnet, daß die Metalleinsätze (9,10) soweit in die Kunststoff-Formkörper eingebettet sind, daß ausschließlich die Funktionselemente (4) sowie ringförmige Bereiche rund um die Drehachse einschließlich der axialen Lagerflächen (16,17) freiliegen.Pliers according to claim 5, characterized in that the metal inserts (9, 10) are embedded in the plastic molded bodies to such an extent that only the functional elements (4) and annular areas around the axis of rotation, including the axial bearing surfaces (16, 17), are exposed. Zange nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß an den Metalleinsätzen (9, 10) rund um die Drehachse als ringförmige Erhebungen (15) gestaltete axiale Lagerflächen (16, 17) angeformt sind.Pliers according to one of the preceding claims, characterized in that axial bearing surfaces (16, 17) designed as annular elevations (15) are formed on the metal inserts (9, 10) around the axis of rotation. Zange nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Metalleinsätze (9, 10) mit vollständig in die Formkörper eingebetteten Verlängerungen (13) versehen sind, die sich bis in den Anfang der Handgriffe (5, 6) hinein erstrecken.Pliers according to one of the preceding claims, characterized in that the metal inserts (9, 10) are provided with extensions (13) which are completely embedded in the moldings and extend into the beginning of the handles (5, 6). Zange nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Metalleinsatz (9 bzw. 10) mit Ausnahme des Funktionselementes (4) ein Stanzteil ist, welches mit dem Funktionselementes (4) verschweißt ist.Pliers according to one of the preceding claims, characterized in that the metal insert (9 or 10), with the exception of the functional element (4), is a stamped part which is welded to the functional element (4). Zange nach Anspruch 9, dadurch gekennzeichnet, daß Stanzteil und Funktionselement durch ein WIG-Schweißverfahren ohne Schweißzusatz verbunden sind.Pliers according to claim 9, characterized in that the stamped part and the functional element are connected by a TIG welding process without welding filler. Zange nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Zangenhälften (1, 2) aus Polyamid hergestellt sind, in das der jeweilige Metalleinsatz (9 bzw. 10) während des Spritzvorgangs formschlüssig eingebettet wird.Pliers according to one of the preceding claims, characterized in that the pliers halves (1, 2) are made of polyamide, in which the respective metal insert (9 or 10) is embedded in a form-fitting manner during the spraying process. Zange nach einem der vorangehenden Ansprüche, gekennzeichnet durch eine zwischen Zapfen (7) der Handgriffe (5, 6) gehaltene Feder (8), wobei die Zapfen (7) mit an ihrem Ende angeordneten, nach Art eines Widerhakens gestalteten Erweiterungen (7a) versehen sind.Pliers according to one of the preceding claims, characterized by a spring (8) held between pins (7) of the handles (5, 6), the pins (7) being provided with extensions (7a) arranged at their ends and designed in the manner of a barb are.
EP96103123A 1996-03-01 1996-03-01 Pliers with two arms made from moulded plastic Expired - Lifetime EP0794039B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP96103123A EP0794039B1 (en) 1996-03-01 1996-03-01 Pliers with two arms made from moulded plastic
AT96103123T ATE186864T1 (en) 1996-03-01 1996-03-01 PLIERS WITH TWO PLIERS HALF MADE OF PLASTIC MOLDED BODY
DE59603713T DE59603713D1 (en) 1996-03-01 1996-03-01 Pliers with two pliers halves made of molded plastic
ES96103123T ES2139968T3 (en) 1996-03-01 1996-03-01 PLIERS WITH SEMI-PLASTIC BODY PLIERS.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96103123A EP0794039B1 (en) 1996-03-01 1996-03-01 Pliers with two arms made from moulded plastic

Publications (2)

Publication Number Publication Date
EP0794039A1 true EP0794039A1 (en) 1997-09-10
EP0794039B1 EP0794039B1 (en) 1999-11-24

Family

ID=8222520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96103123A Expired - Lifetime EP0794039B1 (en) 1996-03-01 1996-03-01 Pliers with two arms made from moulded plastic

Country Status (4)

Country Link
EP (1) EP0794039B1 (en)
AT (1) ATE186864T1 (en)
DE (1) DE59603713D1 (en)
ES (1) ES2139968T3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005120157A2 (en) * 2004-06-14 2005-12-22 Seamus Duffy Snap ring pliers
DE102016109488A1 (en) * 2016-05-24 2017-11-30 G. Lang GmbH & Co. KG Actuator, in particular lever or wrench, and method for its production
US20210170558A1 (en) * 2019-12-04 2021-06-10 Hong Ann Tool Industries Co., Ltd. Circlip pliers

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483383A (en) * 1946-01-29 1949-09-27 Waldes Kohinoor Inc Tool for handling open-ended spring retaining rings
FR1247950A (en) * 1959-07-30 1960-12-09 Advanced pliers
FR1310734A (en) * 1961-10-21 1962-11-30 Plast Outils Ets Pliers type tool
US3082652A (en) * 1959-07-30 1963-03-26 Marti Rene Pliers and like tools
US3833953A (en) * 1973-12-21 1974-09-10 Illinois Tool Works Dielectric tool
FR2440249A1 (en) * 1978-10-30 1980-05-30 Sibille & Cie Ateliers Insulated pliers for electrical installation - is completely externally insulated except for jaws and pivoting surfaces
GB2119695A (en) * 1982-05-05 1983-11-23 Kenneth Robert Scott Pliers
FR2562622A1 (en) * 1984-04-09 1985-10-11 Chavagne Jean Springs for moving apart the handles of pliers
EP0290260A2 (en) * 1987-05-07 1988-11-09 Stride Tool Inc. Hand tool
EP0624433A1 (en) * 1993-05-08 1994-11-17 Hazet-Werk Hermann Zerver GmbH & Co. KG Pliers

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483383A (en) * 1946-01-29 1949-09-27 Waldes Kohinoor Inc Tool for handling open-ended spring retaining rings
FR1247950A (en) * 1959-07-30 1960-12-09 Advanced pliers
US3082652A (en) * 1959-07-30 1963-03-26 Marti Rene Pliers and like tools
FR1310734A (en) * 1961-10-21 1962-11-30 Plast Outils Ets Pliers type tool
US3833953A (en) * 1973-12-21 1974-09-10 Illinois Tool Works Dielectric tool
FR2440249A1 (en) * 1978-10-30 1980-05-30 Sibille & Cie Ateliers Insulated pliers for electrical installation - is completely externally insulated except for jaws and pivoting surfaces
GB2119695A (en) * 1982-05-05 1983-11-23 Kenneth Robert Scott Pliers
FR2562622A1 (en) * 1984-04-09 1985-10-11 Chavagne Jean Springs for moving apart the handles of pliers
EP0290260A2 (en) * 1987-05-07 1988-11-09 Stride Tool Inc. Hand tool
EP0624433A1 (en) * 1993-05-08 1994-11-17 Hazet-Werk Hermann Zerver GmbH & Co. KG Pliers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005120157A2 (en) * 2004-06-14 2005-12-22 Seamus Duffy Snap ring pliers
WO2005120157A3 (en) * 2004-06-14 2006-06-22 Seamus Duffy Snap ring pliers
DE102016109488A1 (en) * 2016-05-24 2017-11-30 G. Lang GmbH & Co. KG Actuator, in particular lever or wrench, and method for its production
US20210170558A1 (en) * 2019-12-04 2021-06-10 Hong Ann Tool Industries Co., Ltd. Circlip pliers

Also Published As

Publication number Publication date
EP0794039B1 (en) 1999-11-24
DE59603713D1 (en) 1999-12-30
ES2139968T3 (en) 2000-02-16
ATE186864T1 (en) 1999-12-15

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