EP0140183B1 - Pliers - Google Patents

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Publication number
EP0140183B1
EP0140183B1 EP84111691A EP84111691A EP0140183B1 EP 0140183 B1 EP0140183 B1 EP 0140183B1 EP 84111691 A EP84111691 A EP 84111691A EP 84111691 A EP84111691 A EP 84111691A EP 0140183 B1 EP0140183 B1 EP 0140183B1
Authority
EP
European Patent Office
Prior art keywords
pliers
legs
leg
plastic
joint
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
Application number
EP84111691A
Other languages
German (de)
French (fr)
Other versions
EP0140183A1 (en
Inventor
Walter Erke
Jürgen Koltermann
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.)
Belzer-Dowidat Werkzeug-Union GmbH
Original Assignee
Belzer-Dowidat Werkzeug-Union GmbH
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Filing date
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Application filed by Belzer-Dowidat Werkzeug-Union GmbH filed Critical Belzer-Dowidat Werkzeug-Union GmbH
Publication of EP0140183A1 publication Critical patent/EP0140183A1/en
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Publication of EP0140183B1 publication Critical patent/EP0140183B1/en
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/02Jaws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B25HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25BTOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B7/00Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools

Definitions

  • the invention relates to pliers for holding and / or pinching workpieces, with two working edges abutting, articulated metallic legs, each having a working part and a plastic coated curved handle part and made of sheet metal of substantially constant thickness, and with one Handle parts of the leg pushing apart spring.
  • a known pliers the legs of which are made of sheet metal material and the handle parts are coated with plastic, is known from US-A-3 521 510. With these pliers, the handle parts of the legs are pressed apart by a spring, so that the working parts are normally held in the open position.
  • the plastic coating consists of sleeves that are pushed onto the sheet metal parts of the legs, and the spring engages directly on the unprotected sheet metal parts and is exposed unprotected. The spring can therefore come into conflict with other objects or cause injuries when the pliers are actuated.
  • US-A-3 082 652 describes a similar pair of pliers, the legs of which consist of plastic-coated sheet metal parts, but no spring is provided here at all, which brings the pliers legs into the open position.
  • the invention has for its object to provide a pair of pliers of the type mentioned, in which the spring is housed protected with a simple shape of the plastic covers of the legs.
  • the invention provides that the spring is inserted in recesses in the handle parts and covered on both sides by plates, that one plate is molded from the plastic of one leg and the other plate is molded from the plastic of the other leg, and that the plates are one have such an extension in the transverse direction that they cover the spring in each open position of the pliers.
  • a flat stop is expediently provided on at least one of the legs and limits the closing movement of the working parts.
  • This stop which is molded onto the plastic coating of one of the handle parts, protects the cutting edges against excessive working pressure, so that overstressing of the cutting edges is avoided.
  • the coating areas each have a circular segment-shaped boundary around the hinge axis.
  • the hinge axis connects the metallic legs.
  • the working parts In order to enable the legs to lie against one another over the entire surface, the working parts have exposed circular areas which are delimited by the plastic sheathing.
  • the front ends of the plastic coatings can be designed on the outer sides of the legs in the form of thumb recesses in order to facilitate gripping and actuating the pliers and to ensure a secure grip for the hand.
  • the joint preferably has a screw as the joint axis. This enables the joint to be readjusted in the event of loosening or wear of joint parts.
  • All or part of the working parts can be provided with a hard coating.
  • a hard coating can e.g. B. consist of titanium carbide or titanium nitride.
  • Such cutting edges are suitable for cutting soft and hard wires.
  • the working part runs obliquely to the plane of the handle part and that the undersides of the legs form an obtuse angle in the working part.
  • a spring is arranged in a recess on the handle side between the legs, which spring is overlapped on each side by a plate molded onto the coating area.
  • the spring that pushes the pliers legs apart is thus concealed between the plates.
  • a flat stop is expediently provided on at least one of the legs and limits the closing movement of the working parts.
  • This stop which is molded onto the plastic coating of one of the handle parts, protects the cutting edges against excessive working pressure, so that overstressing of the cutting edges is avoided.
  • the coating areas each have a circular segment-shaped boundary around the
  • the hinge axis connects the metallic legs.
  • the working parts In order to enable the legs to lie against one another over the entire surface, the working parts have exposed circular areas which are delimited by the plastic sheathing.
  • the front ends of the plastic coatings can be designed on the outer sides of the legs in the form of thumb recesses in order to facilitate gripping and actuating the pliers and to ensure a secure grip for the hand.
  • the joint preferably has a screw as the joint axis. This enables the joint to be readjusted in the event of loosening or wear of joint parts.
  • All or part of the working parts can be provided with a hard coating.
  • a hard coating can e.g. B. consist of titanium carbide or titanium nitride.
  • Such cutting edges are suitable for cutting soft and hard wires.
  • the pliers shown in the form of a side cutter have two metallic legs 11, 12 which are connected to one another by a joint 13.
  • Each leg 11, 12 consists of a front working part 14 and a rear handle part 15.
  • the metallic legs 11, 12, which are shown in FIG. 4 without plastic coating of the handle parts, consist of sheet metal strips of constant thickness. The strengths of the sheet metal parts are reduced by beveling only in the area of the abutting cutting edges 16, 17.
  • the legs 11, 12 are provided with a plastic coating 18 which determines the outer contour of the pliers legs in the handle part 15.
  • the handle parts 15 have an arcuate shape in the plane of the legs 11, 12, the arc openings facing one another.
  • the plastic coating 18 extends into the vicinity of the joint 13, where it ends at a boundary 19 in the form of a segment of a circle.
  • the front areas 24 of the handle parts 15, i.e. those areas which lie between the joint 13 and the arcuate areas run parallel to one another.
  • a plastic stop 23 protruding in the direction of the other leg is formed, against which the other leg abuts in the closed state.
  • the stop 23 has the task of limiting the closing force and protecting the cutting edges 16, 17 and the plastic parts from being pressed against one another too strongly.
  • the plastic coating 18 forms thumb troughs 20 at the level of the areas 24.
  • the handle parts 15 have recesses on the mutually facing surfaces, into which a spring 21 is inserted, which strives to push the pliers legs 11, 12 apart.
  • the recess containing the spring 21 is covered on both sides by plates 22, one plate of which is molded onto the plastic covering 18 of one leg 11 and the other plate is molded onto the plastic covering 18 of the other leg 12.
  • the plates 22 have such an extension in the transverse direction that they cover the spring 21 in each open position of the pliers.
  • the metallic pliers legs 11, 12 have bends 25 in the initial region of the handle parts, so that the metallic legs lie in a common plane in the region of the handle parts.
  • Corresponding offsets 26 are also provided in the initial region of the working parts 14 to ensure that the cutting edges 16, 17 meet. 2 shows, the offset 26 of the leg 12, which projects in the direction of the plate 27 forming the joint part of the other leg 11, has an arcuate course. However, the curve of the bend 26 does not run in a circle around the center of the joint 13, but the distance of the bend 26 from the central axis of the joint 13 increases to the outer edge of the leg 12, so that the part of the leg 11 extending from the plate 27 increases the opening movement of the pliers can be pivoted.
  • the plastic coating 18 is injection-molded onto each of the legs in an injection mold. This gives the handle parts 15 their final outer contour.
  • the cutting edges 16 and 17 abut, as shown in FIG. 5 shows, not with the tips of their cutting edges against each other, but the tip of the cutting edge 16 of the leg 11 lies somewhat lower than the tip of the cutting edge 17 of the leg 12. In contrast, the leg 11 lies above (in the illustration according to FIG. 4) the leg 12. This means that the legs 11, 12 intersect at the rear end of the cutting edges 16, 17. If the pliers are closed with great force, the cutting edge 16, the leg 11 of which lies above the leg 12 in the region of the joint 13, is pushed under the cutting edge 17. In this way, the legs in the joint 13 are pressed against one another and not pushed apart.
  • Fig. 3 it follows that the cutting edges 16 and 17 are inclined with respect to the legs 11, 12, so that the working parts 14 extend obliquely to the level of the handle parts 15.
  • the working parts are also inclined relative to each other.
  • 5 shows, the undersides of the cutting edges 16 and 17 form an angle a of less than 180 °.
  • the bevels of the cutting edges are on the tops. The angle ⁇ between these bevels is approximately 90 °.
  • Holes 28 are provided in the vicinity of the handle-side ends of the legs 11 and 12 and extend through both the plastic coating 18 and the sheet metal of the legs.
  • the holes 28 serve as hanging holes for threading a thread or wire through which the pliers can be hung. Since the holes 28 also pass through the sheet metal parts, there is no risk of the holes being torn out, even under heavy mechanical stress.

Landscapes

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

Description

Die Erfindung betrifft eine Zange zum Festhalten und/oder Durchkneifen von Werkstücken, mit zwei Arbeitkanten gegeneinanderstoßenden, gelenkig verbundenen metallischen Schenkeln, die jeweils einen Arbeitsteil und einen mit Kunststoff beschichteten gebogenen Griffteil aufweisen und aus Blech von im wesentlichen konstanter Stärke bestehen, und mit einer die Griffteile der Schenkel auseinanderdrückenden Feder.The invention relates to pliers for holding and / or pinching workpieces, with two working edges abutting, articulated metallic legs, each having a working part and a plastic coated curved handle part and made of sheet metal of substantially constant thickness, and with one Handle parts of the leg pushing apart spring.

Eine bekannte Zange, deren Schenkel aus Blechmaterial bestehen und deren Griffteile mit Kunststoff beschichtet sind, ist aus der US-A-3 521 510 bekannt. Bei dieser Zange werden die Griffteile der Schenkel von einer Feder auseinandergedrückt, so daß die Arbeitsteile normalerweise in der Öffnungsstellung gehalten werden. Die Kunststoffbeschichtung besteht aus Hülsen, die auf die Blechteile der Schenkel aufgeschoben sind, und die Feder greift an den ungeschützten Blechteilen unmittelbar an und liegt ungeschützt frei. Die Feder kann daher in Konflikt mit anderen Gegenständen kommen oder bei Betätigung der Zange Verletzungen hervorrufen.A known pliers, the legs of which are made of sheet metal material and the handle parts are coated with plastic, is known from US-A-3 521 510. With these pliers, the handle parts of the legs are pressed apart by a spring, so that the working parts are normally held in the open position. The plastic coating consists of sleeves that are pushed onto the sheet metal parts of the legs, and the spring engages directly on the unprotected sheet metal parts and is exposed unprotected. The spring can therefore come into conflict with other objects or cause injuries when the pliers are actuated.

Eine ähnliche Zange, deren Schenkel aus kunststoffbeschichteten Blechteilen bestehen, beschreibt US-A-3 082 652, jedoch ist hierbei überhaupt keine Feder vorgesehen, die die Zangenschenkel in die Öffnungsstellung bringt.US-A-3 082 652 describes a similar pair of pliers, the legs of which consist of plastic-coated sheet metal parts, but no spring is provided here at all, which brings the pliers legs into the open position.

Der Erfindung liegt die Aufgabe zugrunde, eine Zange der eingangs genannten Art zu schaffen, bei der bei einfacher Formgestaltung der Kunststoffüberzüge der Schenkel die Feder geschützt untergebracht ist.The invention has for its object to provide a pair of pliers of the type mentioned, in which the spring is housed protected with a simple shape of the plastic covers of the legs.

Zur Lösung dieser Aufgabe ist erfindungsgemäß vorgesehen, daß die Feder in Ausnehmungen der Griffteile eingesetzt und auf beiden Seiten von Platten überdeckt ist, daß die eine Platte dem Kunststoff des einen Schenkels und die andere Platte dem Kunststoff des anderen Schenkels angeformt ist und daß die Platten eine solche Erstreckung in Querrichtung haben, daß sie in jeder Öffnungsstellung der Zange die Feder überdecken.To solve this problem, the invention provides that the spring is inserted in recesses in the handle parts and covered on both sides by plates, that one plate is molded from the plastic of one leg and the other plate is molded from the plastic of the other leg, and that the plates are one have such an extension in the transverse direction that they cover the spring in each open position of the pliers.

Die Feder, die die Zangenschenkel auseinanderdrückt, ist somit verdeckt zwischen den Platten angeordnet.The spring that pushes the pliers legs apart is thus concealed between the plates.

Zweckmäßigerweise ist an mindestens einem der Schenkel ein flächenförmiger Anschlag vorgesehen, der die Schließbewegung der Arbeitsteile begrenzt. Dieser Anschlag, der der Kunststoffbeschichtung eines der Griffteile angeformt ist, schützt die Schneiden gegen einen zu starken Arbeitsdruck, so daß Überbeanspruchungen der Schneiden vermieden werden.A flat stop is expediently provided on at least one of the legs and limits the closing movement of the working parts. This stop, which is molded onto the plastic coating of one of the handle parts, protects the cutting edges against excessive working pressure, so that overstressing of the cutting edges is avoided.

Die Beschichtungsbereiche weisen jeweils eine kreissegmentförmige Begrenzung um die Gelenkachse herum auf. Die Gelenkachse verbindet die metallischen Schenkel miteinander. Um eine vollflächige gegenseitige Anlage der Schenkel zu ermöglichen, haben die Arbeitsteile frei liegende kreisförmige Bereiche, welche von der Kunststoffummantelung begrenzt sind.The coating areas each have a circular segment-shaped boundary around the hinge axis. The hinge axis connects the metallic legs. In order to enable the legs to lie against one another over the entire surface, the working parts have exposed circular areas which are delimited by the plastic sheathing.

Die vorderen Enden der Kunststoffbeschichtungen können an den Außenseiten der Schenkel in Form von Daumenmulden ausgebildet sein, um das Greifen und Betätigen der Zange zu erleichtern und einen sicheren Halt für die Hand zu gewährleisten.The front ends of the plastic coatings can be designed on the outer sides of the legs in the form of thumb recesses in order to facilitate gripping and actuating the pliers and to ensure a secure grip for the hand.

Vorzugsweise weist das Gelenk als Gelenkachse eine Schraube auf. Dies ermöglicht das Nachstellen des Gelenkes im Falle der Lockerung oder der Abnutzung von Gelenkteilen.The joint preferably has a screw as the joint axis. This enables the joint to be readjusted in the event of loosening or wear of joint parts.

Die Arbeitsteile können ganz oder teilweise mit einer harten Beschichtung versehen werden. Eine solche Beschichtung kann z. B. aus Titankarbid oder Titannitrit bestehen. Derartige Schneiden sind zum Durchtrennen weicher und harter Drähte geeignet.All or part of the working parts can be provided with a hard coating. Such a coating can e.g. B. consist of titanium carbide or titanium nitride. Such cutting edges are suitable for cutting soft and hard wires.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist bei einer als Seitenschneider ausgebildeten Zange vorgesehen, daß der Arbeitsteil schräg zur Ebene des Griffteiles verläuft und daß die Unterseiten der Schenkel im Arbeitsteil einen stumpfen Winkel einschließen.According to a preferred embodiment of the invention, in the case of pliers designed as side cutters, it is provided that the working part runs obliquely to the plane of the handle part and that the undersides of the legs form an obtuse angle in the working part.

Wenn die Arbeitskanten einer Zange schneidenförmig ausgebildet sind und gegeneinanderstoßen, haben sie die Tendenz sich übereinanderzuschieben. Hierdurch können bei großen Kräften starke Belastungen des Gelenks auftreten, wobei Axialverschiebungen der Schenkel im Gelenk auftreten können, so daß die Wirksamkeit der Zange verringert wird. Zur Vermeidung solcher Axialverschiebungen ist gemäß einer bevorzugten Weiterbildung der Erfindung vorgesehen, daß der eine Schenkel, der im Gelenk über dem anderen Schenkel liegt, mit seiner Arbeitskante geringfügig unter diejenige des anderen Schenkels greift. Hierbei überschneiden sich - in Seitenansicht der Zange - die Schenkel geringfügig im Arbeitsteil. Derjenige Schenkel, der im Gelenk oben liegt, befindet sich mit seiner Arbeitskante unter der Arbeitskante des anderen Schenkels, so daß die beiden Zangenschenkel im Gelenk durch die Schließkraft axial gegeneinandergedrückt werden.If the working edges of a pair of pliers are cut-shaped and butt against each other, they have the tendency to slide over one another. As a result, strong loads on the joint can occur with large forces, whereby axial displacements of the legs can occur in the joint, so that the effectiveness of the pliers is reduced. To avoid such axial displacements, it is provided according to a preferred development of the invention that one leg, which lies in the joint above the other leg, engages slightly with that of the other leg with its working edge. Here - in side view of the pliers - the legs overlap slightly in the working part. The leg that lies above in the joint is located with its working edge under the working edge of the other leg, so that the two pliers legs in the joint are pressed axially against one another by the closing force.

Gemäß einer vorteilhaften Weiterbildung der Erfindung ist vorgesehen, daß griffseitig zwischen den Schenke eine Feder in einer Ausnehmung angeordnet ist, die auf jeder Seite von einer dem Beschichtungsbereich angeformten Platte übergriffen wird. Die Feder, die die Zangenschenkel auseinanderdrückt, ist somit verdeckt zwischen den Platten angeordnet.According to an advantageous development of the invention it is provided that a spring is arranged in a recess on the handle side between the legs, which spring is overlapped on each side by a plate molded onto the coating area. The spring that pushes the pliers legs apart is thus concealed between the plates.

Zweckmäßigerweise ist an mindestens einem der Schenkel ein flächenförmiger Anschlag vorgesehen, der die Schließbewegung der Arbeitsteile begrenzt. Dieser Anschlag, der der Kunststoffbeschichtung eines der Griffteile angeformt ist, schützt die Schneiden gegen einen zu starken Arbeitsdruck, so daß Überbeanspruchungen der Schneiden vermieden werden.A flat stop is expediently provided on at least one of the legs and limits the closing movement of the working parts. This stop, which is molded onto the plastic coating of one of the handle parts, protects the cutting edges against excessive working pressure, so that overstressing of the cutting edges is avoided.

Die Beschichtungsbereiche weisen jeweils eine kreissegmentförmige Begrenzung um dieThe coating areas each have a circular segment-shaped boundary around the

Gelenkachse herum auf. Die Gelenkachse verbindet die metallischen Schenkel miteinander. Um eine vollflächige gegenseitige Anlage der Schenkel zu ermöglichen, haben die Arbeitsteile frei liegende kreisförmige Bereiche, welche von der Kunststoffummantelung begrenzt sind.Hinge axis around. The hinge axis connects the metallic legs. In order to enable the legs to lie against one another over the entire surface, the working parts have exposed circular areas which are delimited by the plastic sheathing.

Die vorderen Enden der Kunststoffbeschichtungen können an den Außenseiten der Schenkel in Form von Daumenmulden ausgebildet sein, um das Greifen und Betätigen der Zange zu erleichtern und einen sicheren Halt für die Hand zu gewährleisten.The front ends of the plastic coatings can be designed on the outer sides of the legs in the form of thumb recesses in order to facilitate gripping and actuating the pliers and to ensure a secure grip for the hand.

Vorzugsweise weist das Gelenk als Gelenkachse eine Schraube auf. Dies ermöglicht das Nachstellen des Gelenkes im Falle der Lockerung oder der Abnutzung von Gelenkteilen.The joint preferably has a screw as the joint axis. This enables the joint to be readjusted in the event of loosening or wear of joint parts.

Die Arbeitsteile können ganz oder teilweise mit einer harten Beschichtung versehen werden. Eine solche Beschichtung kann z. B. aus Titankarbid oder Tiatnnitrit bestehen. Derartige Schneiden sind zum Durchtrennen weicher und harter Drähte geeignet.All or part of the working parts can be provided with a hard coating. Such a coating can e.g. B. consist of titanium carbide or titanium nitride. Such cutting edges are suitable for cutting soft and hard wires.

Im folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert.In the following an embodiment of the invention will be explained with reference to the drawings.

Es zeigen:

  • Fig. 1 eine Ansicht einer Zange in Form eines Seitenschneiders,
  • Fig. 2 den Seitenschneider der Fig. 1 in vergrößerter Darstellung, teilweise aufgeschnitten,
  • Fig. 3 einen Schnitt entlang der Linie 111-111 der Fig. 2,
  • Fig. 4 eine Ansicht der metallischen Schenkel (dieses Beispiel zeigt nicht alle Merkmale des Anspruchs 1) und
  • Fig. 5 einen Schnitt entlang der Linie V-V von Fig. 4.
Show it:
  • 1 is a view of pliers in the form of a side cutter,
  • 2 the side cutter of FIG. 1 in an enlarged view, partially cut away,
  • 3 shows a section along the line 111-111 of FIG. 2,
  • Fig. 4 is a view of the metallic legs (this example does not show all the features of claim 1) and
  • 5 shows a section along the line VV of FIG. 4th

Die dargestellte Zange in Form eines Seitenschneiders weist zwei metallische Schenkel 11,12 auf, die durch ein Gelenk 13 miteinander verbunden sind. Jeder Schenkel 11,12 besteht aus einem vorderen Arbeitsteil 14 und einem rückwärtigen Griffteil 15. Die metallischen Schenkel 11,12, die in Fig. 4 ohne Kunststoffbeschichtung der Griffteile dargestellt sind, bestehen aus Blechstreifen konstanter Stärke. Nur im Bereich der gegeneinanderstoßenden Schneiden 16,17 sind die Stärken der Blechteile durch Abschrägung verringert. Im Bereich der hinter dem Gelenk 13 liegenden Griffteile sind die Schenkel 11,12 mit einer Kunststoffbeschichtung 18 versehen, die die Außenkontur der Zangenschenkel im Griffteil 15 bestimmt. Die Griffteile 15 haben in der Ebene der Schenkel 11,12 bogenförmigen Verlauf, wobei die Bogenöffnungen einander zugewandt sind. An jedem Griffteil 15 erstreckt sich die Kunststoffbeschichtung 18 bis in die Nähe des Gelenks 13, wo sie an einer kreissegmentförmigen Begrenzung 19 endet. Die vorderen Bereiche 24 der Griffteile 15, d.h. diejenigen Bereiche, die zwischen dem Gelenk 13 und den bogenförmigen Bereichen liegen, verlaufen parallel zueinander. An einem dieser Bereiche 24 ist ein in Richtung auf den anderen Schenkel vorstehender Anschlag 23 aus Kunststoff angeformt, gegen den der andere Schenkel im Schließzustand stößt. Der Anschlag 23 hat die Aufgabe, die Schließkraft zu begrenzen und die Schneiden 16,17 und die Kunststoffteile vor zu starkem Gegeneinanderpressen zu schützen. An den Außenseiten der Schenkel 11,12 bildet die Kunststoffbeschichtung 18 in Höhe der Bereiche 24 Daumenmulden 20.The pliers shown in the form of a side cutter have two metallic legs 11, 12 which are connected to one another by a joint 13. Each leg 11, 12 consists of a front working part 14 and a rear handle part 15. The metallic legs 11, 12, which are shown in FIG. 4 without plastic coating of the handle parts, consist of sheet metal strips of constant thickness. The strengths of the sheet metal parts are reduced by beveling only in the area of the abutting cutting edges 16, 17. In the area of the handle parts lying behind the joint 13, the legs 11, 12 are provided with a plastic coating 18 which determines the outer contour of the pliers legs in the handle part 15. The handle parts 15 have an arcuate shape in the plane of the legs 11, 12, the arc openings facing one another. On each grip part 15, the plastic coating 18 extends into the vicinity of the joint 13, where it ends at a boundary 19 in the form of a segment of a circle. The front areas 24 of the handle parts 15, i.e. those areas which lie between the joint 13 and the arcuate areas run parallel to one another. On one of these areas 24, a plastic stop 23 protruding in the direction of the other leg is formed, against which the other leg abuts in the closed state. The stop 23 has the task of limiting the closing force and protecting the cutting edges 16, 17 and the plastic parts from being pressed against one another too strongly. On the outer sides of the legs 11, 12, the plastic coating 18 forms thumb troughs 20 at the level of the areas 24.

Hinter dem Gelenk 13 weisen die Griffteile 15 an den einanderzugewandten Flächen Ausnehmungen auf, in die eine Feder 21 eingesetzt ist, welche bestrebt ist, die Zangenschenkel 11,12 auseinanderzudrücken. Die die Feder 21 enthaltende Ausnehmung ist auf beiden Seiten von Platten 22 überdeckt, von denen die eine Platte dem Kunststof füberzug 18 des einen Schenkels 11 und die andere Platte dem Kunststof füberzug 18 des anderen Schenkels 12 angeformt ist. Die Platten 22 haben eine solche Erstreckung in Querrichtung, daß sie in jeder Öffnungsstellung der Zange die Feder 21 überdecken.Behind the joint 13, the handle parts 15 have recesses on the mutually facing surfaces, into which a spring 21 is inserted, which strives to push the pliers legs 11, 12 apart. The recess containing the spring 21 is covered on both sides by plates 22, one plate of which is molded onto the plastic covering 18 of one leg 11 and the other plate is molded onto the plastic covering 18 of the other leg 12. The plates 22 have such an extension in the transverse direction that they cover the spring 21 in each open position of the pliers.

Die Achse des Gelenks 13,131, die durch Löcher der flach gegeneinanderliegenden Gelenkbereiche der Schenkel 11,12 hindurchgesteckt ist und auf die von der Gegenseite ihres Schraubenkopfes her eine Kunststoffmutter 132 aufgeschraubt ist.The axis of the joint 13, 131, which is inserted through holes in the joint regions of the legs 11, 12 lying flat against one another and onto which a plastic nut 132 is screwed from the opposite side of its screw head.

Wie Fig. 4 zeigt, haben die metallischen Zangenschenkel 11,12 im Anfangsbereich der Griffteile 15 Abkröpfungen 25, damit die metallischen Schenkel im Bereich der Griffteile in einer gemeinsamen Ebene liegen. Entsprechende Abkröpfungen 26 sind auch im Anfangsbereich der Arbeitsteile 14 vorgesehen, um sicherzustellen, daß die Schneiden 16,17 aufeinandertreffen. Wie Fig. 2 zeigt, hat die Abkröpfung 26 des Schenkels 12, die in Richtung der das eine Gelenkteil bildenden Platte 27 des anderen Schenkels 11 vorspringt, einen bogenförmigen Verlauf. Der Bogen der Abkröpfung 26 verläuft jedoch nicht kreisförmig um die Mittel des Gelenks 13 herum, sondern der Abstand der Abkröpfung 26 von der Mittelachse des Gelenks 13 nimmt zum äußeren Rand des Schenkels 12 zu, damit der von der Platte 27 abgehende Teil des Schenkels 11 bei der Öffnungsbewegung der Zange geschwenkt werden kann. Bei maximaler Öffnungsstellung stößt der von der Platte 27 abgehende Teil des Schenkels 11 gegen die Abkröpfung 26, die hierdurch die Öffnungsbewegung der Zangenschenkel begrenzt. Durch die als Öffnungsbegrenzung wirkende Abkröpfung 26 wird erreicht, daß keine zustätzlichen Teile für diesen Zweck benötigt werden.As shown in FIG. 4, the metallic pliers legs 11, 12 have bends 25 in the initial region of the handle parts, so that the metallic legs lie in a common plane in the region of the handle parts. Corresponding offsets 26 are also provided in the initial region of the working parts 14 to ensure that the cutting edges 16, 17 meet. 2 shows, the offset 26 of the leg 12, which projects in the direction of the plate 27 forming the joint part of the other leg 11, has an arcuate course. However, the curve of the bend 26 does not run in a circle around the center of the joint 13, but the distance of the bend 26 from the central axis of the joint 13 increases to the outer edge of the leg 12, so that the part of the leg 11 extending from the plate 27 increases the opening movement of the pliers can be pivoted. At the maximum opening position, the part of the leg 11 extending from the plate 27 abuts the offset 26, which thereby limits the opening movement of the pliers legs. By means of the angled portion 26 acting as an opening limitation, it is achieved that no additional parts are required for this purpose.

Bevor die Schenkel 11,12 durch das Gelenk 13 miteinander verbunden werden, wird jedem der Schenkel die Kunststoffbeschichtung 18 in einer Spritzgußform angespritzt. Hierdurch erhalten die Griffteile 15 ihre endgültige Außenkontur.Before the legs 11, 12 are connected to one another by the joint 13, the plastic coating 18 is injection-molded onto each of the legs in an injection mold. This gives the handle parts 15 their final outer contour.

Die Schneiden 16 und 17 stoßen, wie Fig. 5 zeigt, nicht mit den Spitzen ihrer Schneidkanten gegeneinander, sondern die Spitze der Schneide 16 des Schenkels 11 liegt etwas tiefer als die Spitze der Schneide 17 des Schenkels 12. Im Gelenk 13 liegt der Schenkel 11 dagegen (bei der Darstellung nach Fig. 4) über dem Schenkel 12. Dies bedeutet, daß die Schenkel 11,12 sich am rückwärtigen Ende der Schneiden 16,17 überkreuzen. Wenn die Zange mit großer Kraft geschlossen wird, dann schiebt sich die Schneide 16, deren Schenkel 11 im Bereich des Gelenkes 13 über dem Schenkel 12 liegt, unter die Schneide 17. Auf diese Weise werden die Schenkel im Gelenk 13 gegeneinandergedrückt und nicht auseinandergedrückt.The cutting edges 16 and 17 abut, as shown in FIG. 5 shows, not with the tips of their cutting edges against each other, but the tip of the cutting edge 16 of the leg 11 lies somewhat lower than the tip of the cutting edge 17 of the leg 12. In contrast, the leg 11 lies above (in the illustration according to FIG. 4) the leg 12. This means that the legs 11, 12 intersect at the rear end of the cutting edges 16, 17. If the pliers are closed with great force, the cutting edge 16, the leg 11 of which lies above the leg 12 in the region of the joint 13, is pushed under the cutting edge 17. In this way, the legs in the joint 13 are pressed against one another and not pushed apart.

Aus Fig. 3 ergibt sich, daß die Schneiden 16 und 17 in bezug auf die Schenkel 11,12 schräggestellt sind, so daß die Arbeitsteile 14 schräg zur Ebene der Griffteile 15 verlaufen. Die Arbeitsteile sind aber auch relativ zueinander schräggestellt. Wie Fig. 5 zeigt, bilden die Unterseiten der Schneiden 16 und 17 einen Winkel a von weniger als 180°. Die Abschrägungen der Schneiden befinden sich an den Oberseiten. Der Winkel β zwischen diesen Abschrägungen beträgt etwa 90°.From Fig. 3 it follows that the cutting edges 16 and 17 are inclined with respect to the legs 11, 12, so that the working parts 14 extend obliquely to the level of the handle parts 15. The working parts are also inclined relative to each other. 5 shows, the undersides of the cutting edges 16 and 17 form an angle a of less than 180 °. The bevels of the cutting edges are on the tops. The angle β between these bevels is approximately 90 °.

In der Nähe der griffseitigen Enden der Schenkel 11 und 12 sind Löcher 28 vorgesehen, die sich sowohl durch die Kunststoffbeschichtung 18 als auch durch die Bleche der Schenkel erstrecken. Die Löcher 28 dienen als Aufhängelöcher zum Hindurchfädeln eines Fadens oder Drahtes, an dem die Zange aufgehängt werden kann. Da die Löcher 28 auch durch die Blechteile hindurchgehen, besteht selbst bei starker mechanischer Beanspruchung nicht die Gefahr des Ausreißens der Löcher.Holes 28 are provided in the vicinity of the handle-side ends of the legs 11 and 12 and extend through both the plastic coating 18 and the sheet metal of the legs. The holes 28 serve as hanging holes for threading a thread or wire through which the pliers can be hung. Since the holes 28 also pass through the sheet metal parts, there is no risk of the holes being torn out, even under heavy mechanical stress.

Claims (9)

1. Pliers for holding and/or pinching off workpieces, comprising two hinge-connected metallic legs (11,12) having abutting operating edges and including each a working portion (14) and a plastic-coated, bent handle portion (15), said legs consisting of a sheet metal of substantially constant thickness, and a spring (21) pressing apart the handle portions (15) and the legs (11, 22),
characterized in that
the spring (21) is mounted in recesses of the handle portions and is covered bilaterally by plates (22), that one plate (22) is integrally formed with the plastic of the one leg (11) while the other plate (22) is integrally formed with the plastic of the other leg (12) and that the extension of the plates (22) in transverse direction is such as to cover the spring (21) in each opening position of the pliers.
2. Pliers as defined in claim 1,
characterized in that the working portions (14) extend obliquely to the plane of the handle portions (15) and that the undersides of the legs (11, 12) of the working portions (14) include an obtuse angle (a).
3. Pliers as defined in claim 1 or 2,
characterized in that the leg (11) lying in the joint (13) over the other leg (12) has an operating edge slightly underengaging that of the other leg (12).
4. Pliers as defined in one of claims 1 to 3, characterized in that at least one of the legs (11, 12) comprises a flat stop (23) to limit the closing movement of the working portions (14).
5. Pliers as defined in one of claims 1 to 4, characterized in that the working portions (14) are provided at least partly with a hard coating.
6. Pliers as defined in one of claims 1 to 5, characterized in that the plastic coatings comprise a respective circular segment-type delimination (19) around the joint axle (13).
7. Pliers as defined in claim 1 or 6,
characterized in that the front ends of the plastic coatings comprise thumb depressions (20) at the outsides of the legs (11,12).
8. Pliers as defined in one of claims 1 to 7, characterized in that the joint (13) comprises a screw as joint axle.
9. Pliers as defined in one of claims 1 to 8, characterized in that near the handle-sided end of at least one leg (11,12), a hole (28) is provided which extends through the plastic coating (18) and through the sheet metal of said leg.
EP84111691A 1983-10-22 1984-09-29 Pliers Expired EP0140183B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19838330495U DE8330495U1 (en) 1983-10-22 1983-10-22 PLIERS
DE8330495U 1983-10-22

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Publication Number Publication Date
EP0140183A1 EP0140183A1 (en) 1985-05-08
EP0140183B1 true EP0140183B1 (en) 1988-04-27

Family

ID=6758219

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Application Number Title Priority Date Filing Date
EP84111691A Expired EP0140183B1 (en) 1983-10-22 1984-09-29 Pliers

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EP (1) EP0140183B1 (en)
DE (2) DE8330495U1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505080C2 (en) * 1995-02-15 1998-02-19 Guenter Nusbaumer Splitting pliers for separating glass paintings

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3082652A (en) * 1959-07-30 1963-03-26 Marti Rene Pliers and like tools
US3521510A (en) * 1968-05-22 1970-07-21 Crescent Niagara Corp Spring opened pliers
US3774301A (en) * 1972-01-24 1973-11-27 F Brown Cutters
SE398995B (en) * 1975-12-19 1978-01-30 Bahco Verktyg Ab TANG
US4316315A (en) * 1980-01-29 1982-02-23 Josko Vogelnik Pliers

Also Published As

Publication number Publication date
EP0140183A1 (en) 1985-05-08
DE8330495U1 (en) 1984-01-19
DE3470677D1 (en) 1988-06-01

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