EP0277684B1 - Plier-like tool - Google Patents

Plier-like tool Download PDF

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Publication number
EP0277684B1
EP0277684B1 EP19880200120 EP88200120A EP0277684B1 EP 0277684 B1 EP0277684 B1 EP 0277684B1 EP 19880200120 EP19880200120 EP 19880200120 EP 88200120 A EP88200120 A EP 88200120A EP 0277684 B1 EP0277684 B1 EP 0277684B1
Authority
EP
European Patent Office
Prior art keywords
nose
pawl
tooth
engagement
respect
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19880200120
Other languages
German (de)
French (fr)
Other versions
EP0277684A3 (en
EP0277684A2 (en
Inventor
Hans Undin
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.)
Ca Weidmueller & Co GmbH
Weidmueller Interface GmbH and Co KG
Original Assignee
Ca Weidmueller & Co GmbH
Weidmueller Interface 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
Priority claimed from SE8700382A external-priority patent/SE8700382D0/en
Priority claimed from SE8704809A external-priority patent/SE8704809D0/en
Application filed by Ca Weidmueller & Co GmbH, Weidmueller Interface GmbH and Co KG filed Critical Ca Weidmueller & Co GmbH
Publication of EP0277684A2 publication Critical patent/EP0277684A2/en
Publication of EP0277684A3 publication Critical patent/EP0277684A3/en
Application granted granted Critical
Publication of EP0277684B1 publication Critical patent/EP0277684B1/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
    • B25B7/14—Locking means
    • B25B7/16—Locking means combined with means for tightening the operating arms of jaws
    • 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
    • B25B7/14—Locking means

Definitions

  • the invention relates to a plier-like tool of the type specified in the preamble of claim 1, ie a tool which has two elongated handles which can be pivoted from and to one another in a scissor-like manner and by which working elements, such as jaws, are driven.
  • the nature of the work organs, the nature of their movement (scissors-like or vice-like) and the manner in which the motion is transmitted from the handles to the jaws is immaterial from the standpoint of the present invention.
  • the tool is provided with a locking mechanism which has an engagement member and a pawl. The purpose of the ratchet is to prevent workpieces that are not fully machined from being removed from the jaws (involuntarily or due to negligence).
  • FR-A-423.625 describes a plier-like tool of the type specified in the preamble of the appended claim 1, which is used to close seals.
  • “bistable tilt” is to be understood to mean that the switching pawl is acted upon by the spring element in two lateral positions, the tilting moment relating to the switching pawl in one lateral position acting counter to the tilting moment relating to the switching pawl in the other lateral position.
  • the engagement element of the locking mechanism is designed as a separate component, a tab connected to both handles and carrying a row of teeth. One end of the tab protrudes laterally over one of the handles.
  • a locking mechanism with a ratchet operating like a bistable tilt is further described in EP-A-155 031.
  • the engagement member is designed there as a row of teeth arranged on a component pivotally connected to both handles, at the two ends of which an end stop is provided for the switching of the pawl from one side position to the opposite side position.
  • the object of the present invention is to further improve a tool of the type specified in the preamble of patent claim 1, in the sense that the tool described in more detail below, in some cases still existing possibility to remove a not fully processed work object is abolished, and also that a separate component supporting the row of teeth, which must be articulated to both handles, can be omitted, the locking mechanism, if necessary, also limiting the function of the maximum opening position of the handles Can fill stop.
  • the pliers 10A according to FIGS. 1 and 2 contain two work jaws 11A, 12A which are each made in one piece with a handle 11B, 12B and are combined to form a rigid unit.
  • the two work jaw handle units 11A, 11B and 12A, 12B are pivotally connected to one another by means of a pin 13, and a spring 13A mounted on the pin 13, the ends of which at 13A 'and 13A "in each case in a work jaw handle unit 11A, 11B and 12A, 12B are anchored, holds these two units in the open state.
  • a switching or pawl 15 is pivotably mounted on the first handle 11B by means of a further pin 14.
  • the pawl 15 has an engaging portion in the form of an engaging arm 15A extending toward the second handle 12B and a rearward, i.e. in the direction of the free end 11B 'of the first handle 11B extending actuating part in the form of an actuating arm 15B.
  • an omega-shaped spring 16 anchored at one end in its central part.
  • the other end of the spring 16 is attached to a fixed pin 16A anchored in the first handle 11B.
  • the line X '(FIG. 2) represents the connecting line of the pin 14 with the point of engagement 16B on the spring 16, and the actuating part 15B extends between this point of attack 16B and the pin 14.
  • the engagement arm 15A extends across the connecting line X '.
  • the spring 16 is longer than the distance between its two end points 16A, 16B.
  • the spring 16 can also be designed in a zigzag fashion, similar to e.g. in EP-A-155 031, or it may have the helical shape 16 "shown in Fig. 7.
  • the spring can be shaped like a helical tension spring 16 'as will be shown later in FIG.
  • the pawl 15 is in a neutral middle position when the two anchor points of the spring 16, the slot 16B and the pin 16A, and the pin 14 lie on a straight line X , ie when the lines X and X 'coincide.
  • This position is shown in the alternative embodiment in FIG. 5, whereas in FIGS. 1 and 3 a first swung-out side position, and 2 and 4 a second side position of the pawl 15 pivoted out in the opposite direction are shown.
  • the described arrangement of the pawl 15 and the spring 16 has the consequence that the pawl 15 works in the manner of a bistable tilt.
  • the engagement arm 15A has a leading scan edge 15A '.
  • two projections 17 and 18 Arranged in one piece with the second handle 12B are two projections 17 and 18 which extend in the direction of the first handle 11B or to the switching pawl 15, of which the front projection 17, that of two edges 17 'meeting at a corner or tip E , 17 "is advantageously fused with the working jaw 12A to form a unit.
  • the two projections 17 and 18 limit an effective range A for the switching pawl 15, and the rear projection 18 is forward with three, ie in these Area A into teeth 18A, 18B, 18C, as shown in Figures 6a and 6b, these teeth 18A, 18B, 18C have chamfered lower edges such as 18B 'with the first nose 15E on the pawl 15 has a correspondingly bevelled upper edge 15'E '(ie arranged for positive locking).
  • the locking works in the following way:
  • the working jaws 11A, 12A and the handles 11B, 12B are in their maximally open position, which is due to the engagement of the first nose 15E is determined on the engagement arm 15A with the first tooth 18A of the rear projection 18.
  • the locking mechanism also functions as an end stop for the maximum open position of the tool, because the jaw handle units 11A, 11B and 12A, 12B cannot be pivoted further against the direction of the arrow P , and as a result of the shape engagement between the nose 15E and the tooth 18A, a movement of the pawl 15 is only possible in the direction of the arrow P ⁇ , ie from the first tooth 18A via the second tooth 18B to the third tooth 18C and beyond, but not in the opposite sense.
  • the locking mechanism is designed according to the dimensioning and mutual position of the parts 15-18 so that the pawl 15 is in the first swung-out lateral position (in which the anchoring point 16B is outside, in FIG. 1 above, the straight line X ) both if the nose 15E engages with one of the teeth 18A-18C, as shown in Figs. 1 and 6a, as well as when it passes one of the teeth 18B, 18C in the manner shown in Fig. 6b.
  • the spring 16 continuously presses the pawl 15 against the rear projection 18, so that when the handle 11b is actuated in the direction of the arrow P, the nose 15E on the engagement arm 15A is brought behind the tooth 18C, without ever violating the sense of Arrow P ⁇ can be returned, and also immediately behind the tooth 18C in the same position, which is shown in Fig. 6a relative to the tooth 18B.
  • the pawl 15 slides with its free end or with the scanning edge 15A ⁇ of its engagement arm 15A along the facing edge 17 ⁇ of the front projection 17 and is finally from the tip E of the front projection 17 shortly before reaching the position shown in FIG Swing into the first lateral position and brought into engagement with the tooth 18A.
  • the front projection 17 (and in the example shown, in particular its tip E ) thus fills the function of both end stops of the previously known construction according to EP-A-155 031: once by engaging with the nose 15C, and secondly by touching with the scanning edge 15A ⁇ engages.
  • the instant or position in which the second nose 15C abuts the front projection 17A thus determines the end position of the closing movement of the pair of jaws 11A, 12A, ie the position in which the onset of an opening movement is permitted.
  • This position is selected, for example, by means of a corresponding spatial assignment of the two jaws 11A, 12A to the two handles 11B, 12B, so that the jaws 11A, 12A lie closely against one another or, as shown in FIG. 2, are at a selected distance from one another .
  • the pliers 10B according to FIGS. 3 and 4 differ from the pliers 10A in that the switching pawl 15 ⁇ at its free end, in relation to the first nose 15 ⁇ E, a third, transversely to the longitudinal direction of the engagement arm 15 ⁇ A forwards, ie in the direction of the pin 13, extending nose 15 ⁇ D (FIG. 4), and that the front projection 17A, or its edge 17A ⁇ facing the switching pawl 15 ⁇ , has an indentation A ⁇ with a projecting tooth 17B at a distance from the tip E.
  • the upper edge of the nose 15 ⁇ D in the drawing and the lower edge of the tooth 17B in the drawing are so chamfered that the two parts can slide against one another when they come into contact with one another, and the dimensions and positions of the tooth 17B and the nose 15 ⁇ D are so chosen that even if the nose 15 ⁇ D " moves" the tooth 17B while moving the pawl 15 ⁇ contrary to the sense of the arrow P ⁇ (that is, if it is in an analogous position, as shown in FIG. 6b, the nose 15 ⁇ E is opposite the tooth 18B) , A swing of the pawl 15 ⁇ does not occur in the other side position, but this takes place by contact with the edge 17A ⁇ (Fig. 4).
  • the locking mechanism in the pliers 10B works in principle in the same way as the locking mechanism in the pliers 10A.
  • the pawl 15 ⁇ can move freely against the sense of the arrow P ⁇ , because the effective range A , or A and A ⁇ , is sufficiently wide to avoid contact of the first nose 15 ⁇ E on the engagement arm 15 ⁇ A with the teeth 18B and 18C of the rear projection 18 even when the tooth 17B is “exceeded” as mentioned above .
  • the nose 15 ⁇ D gives the arrangement increased functional reliability, among other things because it contributes to the creation of the length B just mentioned.
  • the projecting tooth 17B on the front projection 17 has increased operational safety for the purpose by reliably preventing the pawl 15 ⁇ from reversing during the movement in the direction of the arrow P ⁇ .
  • the second tooth 18B on the rear projection 18 has no function when the pawl 15 ⁇ is acted upon, but has the purpose of preventing the pliers from being able to be opened even partially when the nose 15E or 15 ⁇ E on the engagement arm 15A or 15 ⁇ A is moved from the position behind the first tooth 18A (Figs. 1 and 3) to that behind the third tooth 18C.
  • Such an opening possibility would make it possible to remove a work item that has not been completely processed from the pair of jaws 11A, 12A.
  • the tooth gaps between the teeth 18A and 18B and 18B and 18C are dimensioned such that they do not significantly exceed the size or height of the nose 15E or 15 ⁇ E.
  • a pliers 10B ⁇ according to FIG. 5 differs from the pliers 10B in that the leaf spring 16 is replaced by a spiral spring 16 ⁇ , the anchoring point of which on the pawl 15 ", a pin 16'B, beyond (with respect to the anchoring point 16'A) of the pivot pin 14.
  • the pin 14 ends on the surface of the pawl 15" so as not to stand in the way of the spring 16 ', and the pin 16'B protrudes from this surface.
  • the actuating arm 15B (FIG. 3) can be omitted, or the second nose 15 "C takes over the function of an actuating part and can possibly be made somewhat longer.
  • the pawl 15 "is shown in its neutral position, in which the two anchoring points 16'A and 16'B of the spring 16 'and the pivot pin 14 lie on the straight line X.
  • the pliers 10B "according to FIG. 7 differs from the pliers 10B in particular by the different shape of the two springs 16" and 13AA, of which the first is U-shaped and the second is spiral and in that the handles 11B ', 12B' are provided with plastic covers 11C, 12C.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Description

Die Erfindung bezieht sich auf ein zangenartiges Werkzeug des im Oberbegriff des Patentanspruches 1 angeführten Typs, d.h. ein Werkzeug, welches zwei scherenartig von- und zueinander verschwenkbare längliche Handgriffe aufweist, von denen Arbeitsorgane, wie z.B. Backen, angetrieben werden. Die Beschaffenheit der Arbeitsorgane, die Art ihrer Bewegung (scheren- oder schraubstockartig) und die Art auf welche die Bewegung von den Handgriffen an die Backen übertragen wird ist vom Standpunkt der vorliegenden Erfindung unwesentlich. Das Werzeug ist mit einem Gesperre versehen, welches ein Eingriffsglied und eine Schaltklinke aufweist. Zweck des Gesperres ist zu verhindern, dass nicht voll bearbeitete Arbeitsstücke den Backen (unwillkürlich oder aus Fahrlässigkeit) entnommen werden können.The invention relates to a plier-like tool of the type specified in the preamble of claim 1, ie a tool which has two elongated handles which can be pivoted from and to one another in a scissor-like manner and by which working elements, such as jaws, are driven. The nature of the work organs, the nature of their movement (scissors-like or vice-like) and the manner in which the motion is transmitted from the handles to the jaws is immaterial from the standpoint of the present invention. The tool is provided with a locking mechanism which has an engagement member and a pawl. The purpose of the ratchet is to prevent workpieces that are not fully machined from being removed from the jaws (involuntarily or due to negligence).

In FR-A-423.625 ist ein zangenartiges Werkzeug der im Oberbegriff des angeschlossenen Patentanspruchs 1 angegebenen Art beschrieben, welches zum Verschliessen von Plomben dient. Unter "bistabilen Kippe" ist hierbei zu verstehen, dass die Schaltklinke in zwei Seitenlagen vom Federelement beaufschlagt wird, wobei das auf die Schaltklinke in der einen Seitenlage bezogene Kippmoment dem auf die Schaltklinke in der anderen Seitenlage bezogenen Kippmoment entgegengesetzt wirkt.FR-A-423.625 describes a plier-like tool of the type specified in the preamble of the appended claim 1, which is used to close seals. In this context, “bistable tilt” is to be understood to mean that the switching pawl is acted upon by the spring element in two lateral positions, the tilting moment relating to the switching pawl in one lateral position acting counter to the tilting moment relating to the switching pawl in the other lateral position.

Das Eingriffsglied des Gesperres ist als ein separater Bauteil, eine an beide Handgriffe angeschlossene Lasche, die eine Zahnreihe trägt, gestaltet. Ein Ende der Lasche ragt seitlich über einen der Handgriffe heraus.The engagement element of the locking mechanism is designed as a separate component, a tab connected to both handles and carrying a row of teeth. One end of the tab protrudes laterally over one of the handles.

Ein Gesperre mit einer wie eine bistabile Kippe arbeitenden Schaltklinke ist ferner in EP-A-155 031 beschrieben. Das Eingriffsglied ist dort als eine an einem schwenkbar an beide Handgriffe angeschlossenen Bauteil angeordnete Zahnreihe gestaltet, an deren beiden Enden ein Endanschlag vorgesehen ist für den Umschwung der Schaltklinke aus der einen Seitenlage in die entgegengesetzte Seitenlage.A locking mechanism with a ratchet operating like a bistable tilt is further described in EP-A-155 031. The engagement member is designed there as a row of teeth arranged on a component pivotally connected to both handles, at the two ends of which an end stop is provided for the switching of the pawl from one side position to the opposite side position.

Zu den Vorteilen einer derartig arbeitenden Schaltklinke gehört der Umstand, dass die für den Umschwung der Schaltklinke früher an beiden Enden der Zahnreihe benötigten freien Strecken entfallen, womit eine gedrungenere Bauweise ermöglicht wird.The advantages of a pawl operating in this way include the fact that the free distances previously required at both ends of the row of teeth for the switching pawl to be eliminated are eliminated, which enables a more compact construction.

Die vorliegende Erfindung stellt sich die Aufgabe ein Werkzeug der im Oberbegriff des Patentanspruches 1 angeführten Art weiter zu verbessern, und zwar in dem Sinne, dass die weiter unten näher beschriebene, in manchen Fällen immer noch vorhandene Möglichkeit zur Entnahme eines nicht voll bearbeiteten Arbeitsgegenstandes abgeschafft wird, und ferner dass ein die Zahnreihe tragender separater Bauteil, der an beide Handgriffe gelenkig angeschlossen werden muss, entfallen kann, wobei dass Gesperre gegebenen Falls gleichzeitig auch die Funktion eines die maximale Öffnungslage der Handgriffe begrenzenden Anschlages füllen kann.The object of the present invention is to further improve a tool of the type specified in the preamble of patent claim 1, in the sense that the tool described in more detail below, in some cases still existing possibility to remove a not fully processed work object is abolished, and also that a separate component supporting the row of teeth, which must be articulated to both handles, can be omitted, the locking mechanism, if necessary, also limiting the function of the maximum opening position of the handles Can fill stop.

Bei der Konstruktion gemäss EP-A-155 031 wird die Schaltklinke, nachdem die Handgriffe (und somit auch die Arbeitsbacken) ihre meist geschlossene Lage erreicht haben, von dem einen Endanschlag in die Seitenlage für Nichteingriff mit der Zahnreihe verschwenkt, und tritt mit der Zahnreihe erst wieder dann in Eingriff, nachdem sie vom anderen Endanschlag wieder zurück in die frühere Seitenlage verschwenkt wird. Während der Rückführbewegung der Handgriffe von der meist geschlossenen in die meist geöffnete Lage können die Handgriffe jedoch unbehindert zurück in Richtung zur meist geschlossenen Lage geführt werden. Wenn in dem Werkzeug kleinere Arbeitsstücke bearbeitet werden, ist es möglich, die Handgriffe immer nur teilweise zu öffnen um ein neues Arbeitsstück in die Arbeitsbacken einzuführen, und dann besteht kein Zwang, die folgende Schliessbewegung bis zum Ende durchzuführen, denn die Schaltklinke befindet sich nicht im Eingriff mit der Zahnreihe. Folglich kann auch die Schliessbewegung vorzeitig, d.h. vor Erreichen dermeist geschlossenen Lage abgebrochen werden, womit der Zweck des Gesperres umgangen wird.In the construction according to EP-A-155 031, after the handles (and thus also the work jaws) have reached their mostly closed position, the pawl is pivoted from one end stop into the side position for non-engagement with the row of teeth, and occurs with the row of teeth only then engaged again after it has been pivoted back into the previous lateral position by the other end stop. However, during the return movement of the handles from the mostly closed to the mostly open position, the handles can be guided back unhindered towards the mostly closed position. If smaller workpieces are processed in the tool, it is possible to open the handles only partially in order to insert a new workpiece into the work jaws, and then there is no need to carry out the following closing movement until the end, because the pawl is not in the Intervention with the row of teeth. As a result, the closing movement can also be terminated prematurely, ie before reaching the mostly closed position, thereby circumventing the purpose of the locking mechanism.

Wenn nach der vorliegenden Erfindung ein separater, beiderseits schwenkbar anzuschliessender Bauteil, der den Träger der Zahnreihe bildet, entfallen kann, so bringt das den Vorteil einer vereinfachten Konstruktion und des Entfallens zweier Arbeitsmomente (zweifaches Anlenken des betreffenden Bauteils) beim Zusammenbau mit sich.If, according to the present invention, a separate component which can be pivotally connected on both sides and which forms the support for the row of teeth can be dispensed with, this has the advantage of a simplified construction and the elimination of two working moments (double articulation of the component in question) during assembly.

Die Erfindungsaufgabe wird auf die Weise gelöst, welche aus dem kennzeichnenden Teil des angeschlossenen Patentanspruches 1 hervorgeht. In den Unteransprüchen sind vorteihafte Weiterentwicklungen angegeben. Mit "rückwärts" und "rückwertig" bzw "vorwärts" und "vordere" wird in der Beschreibung und in den Ansprüchen die Richtung zum freien Ende der Handgriffe bzw. zum freien Ende der Backen verstanden.The object of the invention is solved in the manner which emerges from the characterizing part of the attached claim 1. Advantageous further developments are specified in the subclaims. "Backwards" and "backwards" or "forward" and "front" in the description and claims mean the direction of the free end of the handles or the free end of the jaws.

Die Erfindung soll nun anhand beigefügter schematischer Zeichnungen näher erläutert werden. Hierbei zeigt

Fig. 1
ein erfindungsgemäss gestaltetes zangenartiges Werkzeug in einer ersten Ausführungsform in maximal geöffnetem Zustand,
Fig. 2
das Werkzeug gemäss Fig. 1 in maximal geschlossener Lage,
Fig. 3
ein erfindungsgemäss gestaltetes Werkzeug in einer zweiten Ausführungsform in maximal geöffneter Lage,
Fig. 4
das Werkzeug gemäss Fig. 3 in maximal geschlossener Lage,
Fig. 5
eine alternative Ausführungsform des Werkzeuges gemäss Fig. 3 und 4,
Fig. 6a und 6b
in vergrössertem Mass-stab das freie Ende der Schaltklinke des Gesperres gemäss Fig. 3-5, und
Fig. 7
eine weitere alternative Ausführungsform des Werkzeuges gemäss Fig. 3 und 4,

Analoge Konstruktionsteile sind in allen Zeichnungsfiguren mit gleichen oder analogen Bezugszeichen bezeichnet.The invention will now be explained in more detail with reference to the attached schematic drawings. Here shows
Fig. 1
a pliers-like tool designed according to the invention in a first embodiment in the maximum open state,
Fig. 2
1 in the maximally closed position,
Fig. 3
a tool designed according to the invention in a second embodiment in the maximum open position,
Fig. 4
3 in the maximally closed position,
Fig. 5
an alternative embodiment of the tool according to FIGS. 3 and 4,
6a and 6b
on an enlarged scale, the free end of the pawl of the locking mechanism according to FIGS. 3-5, and
Fig. 7
3 shows a further alternative embodiment of the tool according to FIGS. 3 and 4,

Analog construction parts are identified in all drawing figures with the same or analog reference numerals.

Die Zange 10A gemäss Fig. 1 und 2 enthält zwei Arbeitsbacken 11A, 12A die jeweils mit einem Handgriff 11B, 12B einstückig gefertigt und zu einer starren Einheit vereint sind. Die beiden Arbeitsbacke-Handgriffseinheiten 11A, 11B und 12A, 12B sind mittels eines Zapfens 13 schwenkbar miteinander verbunden, und eine auf dem Zapfen 13 aufgezogene Feder 13A, deren Enden bei 13A' und 13A" jeweils in einer Arbeitsbacke-Handgriffseinheit 11A, 11B bzw. 12A, 12B verankert sind, hält diese zwei Einheiten in geöffnetem Zustand.The pliers 10A according to FIGS. 1 and 2 contain two work jaws 11A, 12A which are each made in one piece with a handle 11B, 12B and are combined to form a rigid unit. The two work jaw handle units 11A, 11B and 12A, 12B are pivotally connected to one another by means of a pin 13, and a spring 13A mounted on the pin 13, the ends of which at 13A 'and 13A "in each case in a work jaw handle unit 11A, 11B and 12A, 12B are anchored, holds these two units in the open state.

Am ersten Handgriff 11B ist mittels eines weiteren Zapfens 14 eine Schalt- oder Sperrklinke 15 schwenkbar gelagert. Die Schaltklinke 15 weist einen Eingriffsteil in Form eines in Richtung zum zweiten Handgriff 12B hin sich erstreckenden Eingriffsarms 15A, sowie einen rückwärts, d.h. in Richtung zum freien Ende 11B' des ersten Handgriffes 11B sich erstreckenden Betätigungsteil in Form eines Betätigungsarms 15B auf. Am freien Ende des Betätigungsarms 15B ist, z.B. in einer Öffnung oder in einem Schlitz 16B, eine in ihrem mittleren Teil omegaförmig gestaltete Feder 16 mit ihrem einen Ende verankert. Das andere Ende der Feder 16 ist an einem festen, im ersten Handgriff 11B verankerten Zapfen 16A befestigt. Die Linie X' (Fig. 2) stellt die Verbindungslinie des Zapfens 14 mit der Angriffsstelle 16B an der Feder 16 dar, und der Betätigungsteil 15B erstreckt sich zwischen dieser Angriffsstelle 16B und dem Zapfen 14 . Der Eingriffsarm 15A verläuft quer zur Verbindungslinie X'.A switching or pawl 15 is pivotably mounted on the first handle 11B by means of a further pin 14. The pawl 15 has an engaging portion in the form of an engaging arm 15A extending toward the second handle 12B and a rearward, i.e. in the direction of the free end 11B 'of the first handle 11B extending actuating part in the form of an actuating arm 15B. At the free end of the operating arm 15B, e.g. in an opening or in a slot 16B, an omega-shaped spring 16 anchored at one end in its central part. The other end of the spring 16 is attached to a fixed pin 16A anchored in the first handle 11B. The line X '(FIG. 2) represents the connecting line of the pin 14 with the point of engagement 16B on the spring 16, and the actuating part 15B extends between this point of attack 16B and the pin 14. The engagement arm 15A extends across the connecting line X '.

Die Feder 16 ist länger als der Abstand zwischen ihren beiden Endpunkten 16A, 16B. Alternativ kann die Feder 16 auch zick-zackförmig gestaltet sein , ähnlich wie z.B. in EP-A-155 031 gezeigt ist, oder sie kann die in Fig. 7 dargestellte wendelförmige Form 16" aufweisen. Wenn die Verankerungsstelle 16B jenseits des Zapfens 14 verlegt wird, so kann die Feder wie eine wendelförmige Zugfeder 16' gestaltet werden, wie später in Fig. 5 gezeigt werden wird.The spring 16 is longer than the distance between its two end points 16A, 16B. Alternatively, the spring 16 can also be designed in a zigzag fashion, similar to e.g. in EP-A-155 031, or it may have the helical shape 16 "shown in Fig. 7. When the anchor point 16B is moved beyond the pin 14, the spring can be shaped like a helical tension spring 16 'as will be shown later in FIG.

Die Schaltklinke 15 befindet sich in einer neutralen mittleren Lage, wenn die beiden Verankerungsstellen der Feder 16, der Schlitz 16B und der Zapfen 16A, und der Zapfen 14 an einer geraden Linie X liegen, d.h. wenn die Linien X und X' zusammenfallen. Diese Lage ist bei der alternativen Ausführungsform in Fig. 5 dargestellt, wogegen in den Fig. 1 und 3 eine erste ausgeschwenkte Seitenlage, und in den Fig. 2 und 4 eine in entgegengesetzter Richtung ausgeschwenkte zweite Seitenlage der Schaltklinke 15 gezeigt werden. Die beschriebene Anordnung der Schaltklinke 15 und der Feder 16 hat zu Folge, dass die Schaltklinke 15 auf die Art und Weise einer bistabilen Kippe arbeitet.The pawl 15 is in a neutral middle position when the two anchor points of the spring 16, the slot 16B and the pin 16A, and the pin 14 lie on a straight line X , ie when the lines X and X 'coincide. This position is shown in the alternative embodiment in FIG. 5, whereas in FIGS. 1 and 3 a first swung-out side position, and 2 and 4 a second side position of the pawl 15 pivoted out in the opposite direction are shown. The described arrangement of the pawl 15 and the spring 16 has the consequence that the pawl 15 works in the manner of a bistable tilt.

Am freien Ende des Eingriffsarms 15A ist als Eingriffsorgan eine erste, rückwärts sich erstreckende Nase 15E, und an der Anschlussstelle des Eingriffsarmes 15A an die übrigen Teile der Schaltklinke ist eine zweite, vorwärts sich erstreckende Nase 15C angeordnet. Der Eingriffsarm 15A weist eine vordere Abtastkante 15A' auf. Einstückig mit dem zweiten Handgriff 12B sind zwei in Richtung zum ersten Handgriff 11B bzw. zur Schaltklinke 15 hin sich erstreckende Vorsprüge 17 und 18 angeordnet, von denen der vordere Vorsprung 17, der von zwei in einer Ecke oder Spitze E sich treffende Kanten 17', 17" begrenzt ist, vorteilhafter Weise mit der Arbeitsbacke 12A zu einer Einheit verschmolzen ist. Zusammen bzw. zwischen einander begrenzen die beiden Vorsprünge 17 und 18 einen Wirkungsbereich A für die Schaltklinke 15, und der rückwertige Vorsprung 18 ist mit drei vorwärts, d.h. in diesen Bereich A hinein, gerichteten Zähnen 18A, 18B, 18C versehen. Diese Zähne 18A, 18B, 18C weisen, wie aus Fig. 6a und 6b noch deutlicher ersichtlich ist, abgeschrägte untere Kanten wie 18B' auf, wobei die erste Nase 15E an der Schaltklinke 15 eine entsprechend abgeschrägte (d.h. zum Formschluss angeordnete) obere Kante 15'E' besitzt.At the free end of the engaging arm 15A there is a first, rearwardly extending lug 15E as the engaging member, and a second, forwardly extending lug 15C is arranged at the connection point of the engaging arm 15A to the remaining parts of the pawl. The engagement arm 15A has a leading scan edge 15A '. Arranged in one piece with the second handle 12B are two projections 17 and 18 which extend in the direction of the first handle 11B or to the switching pawl 15, of which the front projection 17, that of two edges 17 'meeting at a corner or tip E , 17 "is advantageously fused with the working jaw 12A to form a unit. Together or between each other, the two projections 17 and 18 limit an effective range A for the switching pawl 15, and the rear projection 18 is forward with three, ie in these Area A into teeth 18A, 18B, 18C, as shown in Figures 6a and 6b, these teeth 18A, 18B, 18C have chamfered lower edges such as 18B 'with the first nose 15E on the pawl 15 has a correspondingly bevelled upper edge 15'E '(ie arranged for positive locking).

Das Gesperre arbeitet auf folgende Weise:The locking works in the following way:

In der Fig. 1 befinden sich die Arbeitsbacken 11A, 12A und die Handgriffe 11B, 12B in ihrer maximal geöffneten Lage welche durch den Eingriff der ersten Nase 15E am Eingriffsarm 15A mit dem ersten Zahn 18A des rückwertigen Vorsprunges 18 bestimmt ist. Es ist ersichtlich, dass das Gesperre auch die Funktion eines Endanschlages für die maximal geöffnete Lage des Werkzeuges ausübt, denn die Backen-Handgriffseinheiten 11A, 11B und 12A, 12B können nicht weiter gegen den Sinn des Pfeiles P ausgeschwenkt werden, und zufolge des Formeingriffes zwischen der Nase 15E und dem Zahn 18A ist eine Bewegung der Schaltklinke 15 nur in Richtung der Pfeiles Pʹ, d.h. vom ersten Zahn 18A über den zweiten Zahn 18B zum dritten Zahn 18C und darüber hinaus möglich, aber nicht im entgegengesetzten Sinne.In FIG. 1, the working jaws 11A, 12A and the handles 11B, 12B are in their maximally open position, which is due to the engagement of the first nose 15E is determined on the engagement arm 15A with the first tooth 18A of the rear projection 18. It can be seen that the locking mechanism also functions as an end stop for the maximum open position of the tool, because the jaw handle units 11A, 11B and 12A, 12B cannot be pivoted further against the direction of the arrow P , and as a result of the shape engagement between the nose 15E and the tooth 18A, a movement of the pawl 15 is only possible in the direction of the arrow Pʹ , ie from the first tooth 18A via the second tooth 18B to the third tooth 18C and beyond, but not in the opposite sense.

Hierbei ist das Gesperre zufolge von Dimensionierung und gegenseitiger Lage der Teile 15-18 so ausgelegt, dass sich die Schaltklinke 15 in der ersten ausgeschwenkten Seitenlage befindet (bei der die Verankerungsstelle 16B ausserhalb, in Fig. 1 oberhalb, der Geraden X liegt) sowohl wenn die Nase 15E mit einem der Zähne 18A-18C einrastet, wie in Fig. 1 und 6a dargestellt, als auch dann, wenn sie auf die in Fig. 6b dargestellte Weise einen der Zähne 18B, 18C passiert.Here, the locking mechanism is designed according to the dimensioning and mutual position of the parts 15-18 so that the pawl 15 is in the first swung-out lateral position (in which the anchoring point 16B is outside, in FIG. 1 above, the straight line X ) both if the nose 15E engages with one of the teeth 18A-18C, as shown in Figs. 1 and 6a, as well as when it passes one of the teeth 18B, 18C in the manner shown in Fig. 6b.

Die Feder 16 drückt in dieser ersten Seitenlage die Schaltklinke 15 ununterbrochen gegen den rückwärtigen Vorsprung 18, so dass bei Betätigung des Handgriffes 11b im Sinne des Pfeiles P die Nase 15E am Eingriffsarm 15A hinter den Zahn 18C gebracht wird, ohne hierbei je gegen den Sinn des Pfeiles Pʹ zurückgeführt werden können, und auch unmittelbar hinter dem Zahn 18C die gleiche Lage einnimmt, die in Fig. 6a gegenüber dem Zahn 18B dargestellt ist.In this first side position, the spring 16 continuously presses the pawl 15 against the rear projection 18, so that when the handle 11b is actuated in the direction of the arrow P, the nose 15E on the engagement arm 15A is brought behind the tooth 18C, without ever violating the sense of Arrow Pʹ can be returned, and also immediately behind the tooth 18C in the same position, which is shown in Fig. 6a relative to the tooth 18B.

Bei weiterer Bewegung des Handgriffes 11B in Richtung des Pfeiles P und der Schaltklinke 15 in Richtung des Pfeiles Pʹ stosst jedoch die zweite Nase 15C am Anschlussende des Eingriffsarmes 15A mit ihrer in der Zeichnung unteren Kante gegen den vorderen Vorsprung 17 an. Dadurch wird ein Umschwung der Schaltklinke 15 herbeigeführt, der sie über die neutrale Lage (dieser vorübergehender Zustand, bei dem beide Feder-Verankerungsstellen wie 16ʹA, 16ʹB und der Schwenkzapfen 14 an einer Geraden X liegen, ist in Fig. 5 dargestellt) in die entgegengesetzte zweite Seitenlage bringt (bei der die Verankerungsstelle 16B wiederum ausserhalb, jetzt gemäss Fig. 2 unterhalb, der Gerade X liegt).Upon further movement of the handle 11B in the direction of arrow P and the pawl 15 in the direction of the arrow However, P'good cheer the second nose 15C at the terminal end of the engaging arm 15A at its lower edge in the drawing against the front projection 17th This causes a reversal of the pawl 15, which it about the neutral position (this temporary state, in which both spring anchoring points such as 16ʹA, 16ʹB and the pivot pin 14 lie on a straight line X is shown in Fig. 5) in the opposite brings the second lateral position (at which the anchoring point 16B is again outside, now according to FIG. 2 below, the straight line X ).

In dieser zweiten Seitenlage wird die Schaltklinke 15 von der Feder 16 dauernd an den vorderen Vorsprung 17 angedrückt.In this second side position, the pawl 15 is constantly pressed by the spring 16 against the front projection 17.

In dieser Lage steht nichts einer Bewegung der Schaltklinke 15 gegen den Sinn des Pfeiles Pʹ entgegen, so dass der Handgriff 11B jetzt, und erst jetzt, entgegen den Sinn des Pfeiles P bewegt, und die Zange 10A somit geöffnet werden kann. Hierbei gleitet die Schaltklinke 15 mit ihrem freien Ende bzw. mit der Abtastkante 15Aʹ ihres Eingriffsarmes 15A entlang der zugewandten Kante 17ʺ des vorderen Vorsprunges 17 und wird schliesslich von der Spitze E des vorderen Vorsprunges 17 kurz vor dem Erreichen der in Fig. 1 dargestellten Lage zum Umschwung in die erste Seitenlage und in Eingriff mit dem Zahn 18A gebracht.In this position, nothing stands in the way of a movement of the pawl 15 against the direction of the arrow P dass , so that the handle 11B now, and only now, moves against the direction of the arrow P , and the pliers 10A can thus be opened. Here, the pawl 15 slides with its free end or with the scanning edge 15Aʹ of its engagement arm 15A along the facing edge 17ʺ of the front projection 17 and is finally from the tip E of the front projection 17 shortly before reaching the position shown in FIG Swing into the first lateral position and brought into engagement with the tooth 18A.

Der vordere Vorsprung 17 (und im dargestellten Beispiel insbesondere seine Spitze E) füllt somit die Funktion beider Endanschläge der vorbekannten Konstruktion gemäss EP-A-155 031: einmal indem er mit der Nase 15C eingreift, und zum anderen Mal, indem er mit der Abtastkante 15Aʹ eingreift.The front projection 17 (and in the example shown, in particular its tip E ) thus fills the function of both end stops of the previously known construction according to EP-A-155 031: once by engaging with the nose 15C, and secondly by touching with the scanning edge 15Aʹ engages.

Der Augenblick, bzw. die Lage, in der die zweite Nase 15C an den vorderen Vorsprung 17A anstosst, bestimmt somit die Endlage der Schliessbewegung des Backenpaares 11A, 12A, d.h. die Lage, in der das Einsetzen einer Öffnungsbewegung zugelassen wird. Diese Lage wird so gewählt, z.B. mittels entsprechender räumlicher Zuordnung der beiden Backen 11A, 12A an die beiden Handgriffe 11B, 12B, dass die Backen 11A, 12A hierbei dicht aneinander anliegen oder, wie in Fig. 2 dargestellt, sich in gewähltem Abstand voneinander befinden.The instant or position in which the second nose 15C abuts the front projection 17A thus determines the end position of the closing movement of the pair of jaws 11A, 12A, ie the position in which the onset of an opening movement is permitted. This position is selected, for example, by means of a corresponding spatial assignment of the two jaws 11A, 12A to the two handles 11B, 12B, so that the jaws 11A, 12A lie closely against one another or, as shown in FIG. 2, are at a selected distance from one another .

Die Zange 10B gemäss Fig. 3 und 4 unterscheidet sich von der Zange 10A dadurch, dass die Schaltklinke 15ʹ an ihrem freien Ende, gegenüber der ersten Nase 15ʹE, noch eine dritte, quer zur Längsrichtung des Eingriffsarmes 15ʹA nach vorwärts, d.h. in Richtung zum Zapfein 13 hin, sich erstreckende Nase 15ʹD (Fig. 4) aufweist, und dass der vordere Vorsprung 17A, bzw. seine der Schaltklinke 15ʹ zugewandte Kante 17Aʺ, im Abstand von der Spitze E eine Einbuchtung Aʹ mit einem vorspringenden Zahn 17B aufweist. Hierbei ist die in der Zeichnung obere Kante der Nase 15ʹD, und die in der Zeichnung untere Kante des Zahnes 17B so abgeschrägt, dass die beiden Teile bei gegenseitiger Berührung aneinander gleiten können, und die Abmessungen und Lagen des Zahnes 17B und der Nase 15ʹD sind so gewählt, dass auch wenn die Nase 15ʹD bei einer Bewegung der Schaltklinke 15ʹ entgegen den Sinn des Pfeiles Pʹ den Zahn 17B "überschreitet" (also wenn sie sich in einer analogen Lage, wie gemäss Fig. 6b die Nase 15ʹE gegenüber dem Zahn 18B befindet), ein Umschwung der Sperrklinke 15ʹ in die andere Seitenlage nicht eintritt, sondern dies durch Berührung mit der Kante 17Aʺ stattfindet (Fig. 4).The pliers 10B according to FIGS. 3 and 4 differ from the pliers 10A in that the switching pawl 15ʹ at its free end, in relation to the first nose 15ʹE, a third, transversely to the longitudinal direction of the engagement arm 15ʹA forwards, ie in the direction of the pin 13, extending nose 15ʹD (FIG. 4), and that the front projection 17A, or its edge 17Aʺ facing the switching pawl 15ʹ, has an indentation Aʹ with a projecting tooth 17B at a distance from the tip E. Here, the upper edge of the nose 15ʹD in the drawing and the lower edge of the tooth 17B in the drawing are so chamfered that the two parts can slide against one another when they come into contact with one another, and the dimensions and positions of the tooth 17B and the nose 15ʹD are so chosen that even if the nose 15ʹD "moves" the tooth 17B while moving the pawl 15ʹ contrary to the sense of the arrow Pʹ (that is, if it is in an analogous position, as shown in FIG. 6b, the nose 15ʹE is opposite the tooth 18B) , A swing of the pawl 15ʹ does not occur in the other side position, but this takes place by contact with the edge 17Aʺ (Fig. 4).

Das Gesperre in der Zange 10B arbeitet im Prinzip auf die gleiche Weise wie das Gesperre in der Zange 10A.The locking mechanism in the pliers 10B works in principle in the same way as the locking mechanism in the pliers 10A.

Da die Teile 15ʹD und 17B aneinander gleiten können, kan die Schaltklinke 15ʹ frei gegen den Sinn des Pfeiles Pʹ bewegt werden, denn der Wirkungsbereich A, bzw. A und Aʹ, ist genügend breit, um eine Berührung der ersten Nase 15ʹE am Eingriffsarm 15ʹA mit den Zähnen 18B und 18C des rückwertigen Vorsprunges 18 auch bei dem oben erwähnten "überschreiten" des Zahnes 17B zu vermeiden.Since the parts 15ʹD and 17B can slide against each other, the pawl 15ʹ can move freely against the sense of the arrow Pʹ , because the effective range A , or A and Aʹ , is sufficiently wide to avoid contact of the first nose 15ʹE on the engagement arm 15ʹA with the teeth 18B and 18C of the rear projection 18 even when the tooth 17B is “exceeded” as mentioned above .

Zu bemerken ist, dass sich bei der Zange 10B die Endanschlagsfunktion auch aus dem Umstand ergibt, dass die Länge B (Fig. 6a) grösser ist als der kleinste Abstand zwischen der Kante 17Aʺ und dem Zahn 18A.It should be noted that with the pliers 10B the end stop function also results from the fact that the length B (FIG. 6a) is greater than the smallest distance between the edge 17Aʺ and the tooth 18A.

Die Nase 15ʹD verleiht der Anordnung erhöhte Funktionssicherheit, u.a. deshalb, weil sie zur Schaffung der soeben erwähnten Länge B beiträgt. Auch der vorspringende Zahn 17B am vorderen Vorsprung 17 hat erhöhte Betriebssicherheit zum Zweck, indem er einen Umschwung der Schaltklinke 15ʹ bei der Bewegung im Sinne des Pfeiles Pʹ zuverlässlich verhindert.The nose 15ʹD gives the arrangement increased functional reliability, among other things because it contributes to the creation of the length B just mentioned. The projecting tooth 17B on the front projection 17 has increased operational safety for the purpose by reliably preventing the pawl 15ʹ from reversing during the movement in the direction of the arrow Pʹ .

In diesem Zusammhenhang ist anzuführen, dass der zweite Zahn 18B am rückwertigen Vorsprung 18 keine Funktion bei der Beaufschlagung der Schaltklinke 15ʹ erfüllt, sondern den Zweck hat zu verhindern, dass die Zange nicht einmal teilweise geöffnet werden kann wenn die Nase 15E oder 15ʹE am Eingriffsarm 15A oder 15ʹA von der Lage hinter dem ersten Zahn 18A (Fig. 1 und 3) in diejenige hinter dem dritten Zahn 18C bewegt wird. Eine derartige Öffnungsmöglichkeit würde es gestatten, einen nicht gänzlich bearbeiteten Arbeitsgegenstand aus dem Backenpaar 11A, 12A herauszunehmen. Aus dem gleichen Grunde werden auch die Zahnlücken zwischen den Zähnen 18A und 18B und 18B und 18C so bemessen, dass sie die Grösse bzw. Höhe der Nase 15E bzw. 15ʹE nicht wesentlich überschreiten.In this context, it should be stated that the second tooth 18B on the rear projection 18 has no function when the pawl 15ʹ is acted upon, but has the purpose of preventing the pliers from being able to be opened even partially when the nose 15E or 15ʹE on the engagement arm 15A or 15ʹA is moved from the position behind the first tooth 18A (Figs. 1 and 3) to that behind the third tooth 18C. Such an opening possibility would make it possible to remove a work item that has not been completely processed from the pair of jaws 11A, 12A. For the same reason, the tooth gaps between the teeth 18A and 18B and 18B and 18C are dimensioned such that they do not significantly exceed the size or height of the nose 15E or 15ʹE.

Eine Zange 10Bʹ gemäss Fig. 5 unterscheidet sich von der Zange 10B dadurch, dass die Blattfeder 16 von einer Spiralfeder 16ʹ ersetzt ist, deren Verankerungsstelle an der Schaltklinke 15", ein Zapfen 16'B, Jenseits (bezüglich der Verankerungsstelle 16'A) des Schwenkzapfens 14 verlegt ist. Der Zapfen 14 endet an der Oberfläche der Schaltklinke 15", um der Feder 16' nicht im Wege zu stehen, und der Zapfen 16'B ragt aus dieser Oberfläche heraus. Der Betätigungsarm 15B (Fig. 3) kann entfallen, bzw. die zweite Nase 15"C übernimmt die Funktion eines Betätigungsteiles und kann eventuell etwas länger gestaltet sein.A pliers 10Bʹ according to FIG. 5 differs from the pliers 10B in that the leaf spring 16 is replaced by a spiral spring 16ʹ, the anchoring point of which on the pawl 15 ", a pin 16'B, beyond (with respect to the anchoring point 16'A) of the pivot pin 14. The pin 14 ends on the surface of the pawl 15" so as not to stand in the way of the spring 16 ', and the pin 16'B protrudes from this surface. The actuating arm 15B (FIG. 3) can be omitted, or the second nose 15 "C takes over the function of an actuating part and can possibly be made somewhat longer.

Die Schaltklinke 15" ist in ihrer neutralen Lage dargestellt, in der die beiden Verankerungsstellen 16'A und 16'B der Feder 16' und der Schwenkzapfen 14 an der Geraden X liegen.The pawl 15 "is shown in its neutral position, in which the two anchoring points 16'A and 16'B of the spring 16 'and the pivot pin 14 lie on the straight line X.

Die Zange 10B" gemäss Fig. 7 unterscheidet sich von der Zange 10B insbesondere durch abweichende Form der beiden Federn 16" und 13AA, von denen die erste U-förmige, und die zweite spiralförmig ist und dadurch, dass die Handgriffe 11B', 12B' mit Kunststoffüberzüngen 11C, 12C versehen sind.The pliers 10B "according to FIG. 7 differs from the pliers 10B in particular by the different shape of the two springs 16" and 13AA, of which the first is U-shaped and the second is spiral and in that the handles 11B ', 12B' are provided with plastic covers 11C, 12C.

Claims (7)

  1. A pliers-like tool (10A-10B") having two handles (11B, 12B, 11B', 12B'), two jaws (11A, 12A) connected to these handles and a locking mechanism for preventing a premature opening of the jaws (11A, 12A), which locking mechanism has a pawl (15, 15', 15") swingably connected by means of a swivel pin (14) to the first handle, and connected to the second handle, an engagement member (17, 18), for the pawl, in which respect the pawl is permanently acted upon by a spring element (16) at an attack point (16B, 16'B) located at a distance from the swivel pin (14) in order to work in the manner of a hinge-joint and in this respect, upon striking against at least one end stop (E) arranged subsequent to the engagement member on the second handle to be swivelled, from a lateral position preventing an opening, into a lateral position permitting an opening and vice versa, in which respect the pawl has an actuation part (15B, 15B'), extending between the said attack point (16B, 16'B) and the swivel pin (14), as well as an engagement part (15A, 15'A, 15") extending from the swivel pin (14) towards the engagement member and terminated at the free end with an engagement member (15E, 15'E, 15"E), characterised in that the engagement part (15A, 15'A, 15") has the shape of an engagement arm which extends transversely to the connection line (X') of the attack point (16B) of the spring element (16, 16', 16") to the swivel pin (14) and which carries at the free end as an engagement member a rearwardly directed first nose (15E, 15'E) and has at its point of connection to the actuation part (15B, 15'B) a forwardly directed second nose (15C, 15'C), in which respect the engagement member has two projections (17, 18) which are rigidly connected to the second handle (12B, 12B') and which extend towards the first handle (11B, 11B') and which in this respect enclose the engagement arm on both sides, of which the front projection (17) forms one of the said end stops and is arranged for engagement with the second nose (15C, 15'C) for the purpose of rotation of the pawl, in which respect the rear projection (18) has at its free end a first tooth (18A) which is turned to the front projection (17) and which is arranged for engagement with the first nose (15E, 15E'), and in which respect mutually engaging edges of the first nose and of the first tooth are shaped for mutual form engagement.
  2. A tool according to patent claim 1, characterised in that, at the free end of the engagement arm (15'A, 15"A) opposite the first nose (15'E, 15"E), a forwardly extending third nose (15'D, 15"D), and in a bay (A') on the front projection (17A) a tooth (17B) directed towards the engagement arm (15', 15"), are provided, which have facing edges which are slidable on one another, in which respect the dimensions and positions of the third nose (15'E, 15"E) and of the said tooth (17B) are so selected that the third nose can cross the tooth without a pawl (15', 15") being swivelled into the opposite lateral position.
  3. A tool according to patent claim 1 or 2, characterised in that provided on the rear projection (18) there is additionally at least one further tooth (18B, 18C), directed and shaped in the same way as the first tooth (18A), for form engagement with the first nose (15E, 15'E, 15"E) of the engagement arm, in which respect the dimensions and the position of this further tooth or of these further teeth (18B, 18C), as well as the dimensions of the first nose (15E, 15'E, 15") are so selected that the nose can cross the tooth or respectively the teeth without the pawl (15, 15', 15") being swivelled into the opposite lateral position.
  4. A tool according to patent claim 3, characterised in that three teeth (18A, 18B, 18C) are provided on the rear projection (18).
  5. A tool according to any one of the preceding patent claims, characterised in that the tooth (18A) or the teeth (18A, 18B, 18C) on the rear projection (18) have bevelled lower edges (18B') and the first nose (15E) on the pawl (15) has an upper edge (15'E') correspondingly bevelled for form-locking with them.
  6. A tool according to any one of the preceding patent claims, characterised in that the actuation part (15B) of the pawl (15) extends rearwardly and the spring element is designed as a spiral-shaped or omega-shaped spring (16", 16).
  7. A tool according to any one of patent claims 1 to 5, characterised in that the actuation part of the pawl (15") is formed by the second nose (15"B) which extends forwardly, and the spring element is designed as a helical spring (16').
EP19880200120 1987-02-02 1988-01-26 Plier-like tool Expired - Lifetime EP0277684B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8700382 1987-02-02
SE8700382A SE8700382D0 (en) 1987-02-02 1987-02-02 DANGEROUS TOOL
SE8704809 1987-12-02
SE8704809A SE8704809D0 (en) 1987-12-02 1987-12-02 AS A BISTABLE VIPPA WORKING LOCK FOR A TOOL

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP91112205.9 Division-Into 1988-01-26

Publications (3)

Publication Number Publication Date
EP0277684A2 EP0277684A2 (en) 1988-08-10
EP0277684A3 EP0277684A3 (en) 1990-02-07
EP0277684B1 true EP0277684B1 (en) 1992-03-25

Family

ID=26659678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880200120 Expired - Lifetime EP0277684B1 (en) 1987-02-02 1988-01-26 Plier-like tool

Country Status (2)

Country Link
EP (1) EP0277684B1 (en)
DE (1) DE3869439D1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE182722C (en) *
FR13868E (en) * 1910-12-13 1911-07-25 Fermetures En Plomb Des Reinforced rope sealing device
GB901091A (en) * 1958-03-24 1962-07-11 Carl Theodore Marx Improvements in full-stroke mechanisms
GB1507421A (en) * 1975-04-15 1978-04-12 Pressmaster Ab Device for ensuring continuance of a working operation until completion thereof
US4170154A (en) * 1977-12-06 1979-10-09 Thomas & Betts Corporation Full stroke compelling mechanism
DE2903252C2 (en) * 1979-01-29 1985-03-28 Bunker Ramo Corp., Oak Brook, Ill. Crimping pliers
BE888258A (en) * 1981-04-03 1981-07-31 Peever N V PLIERS FOR ATTACHING AN IDENTIFIER ON ANIMAL.
SE8401418D0 (en) * 1984-03-14 1984-03-14 Weidmueller C A Gmbh Co LOCKING DEVICE FOR A TOOL
US4561282A (en) * 1984-09-28 1985-12-31 Hadden Sr Edward L Diminishing arm toggle linkage

Also Published As

Publication number Publication date
EP0277684A3 (en) 1990-02-07
DE3869439D1 (en) 1992-04-30
EP0277684A2 (en) 1988-08-10

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