Pliers

Abstract

The present invention relates to pliers comprising two arms (2, 3) intersecting at a pivot bolt (4), one of which is movable and the other fixed, with handles (5, 6) formed on one side of the pivot bolt (4) and interacting with jaws (7, 8) formed as prongs (M) on the other side of the pivot bolt (4), the fixed arm (2) further comprising a longitudinal slot (9) with teeth (19), as well as the pivot bolt (4) arranged in a receiver (14) and movable about the axis (x) from engagement with the teeth to an unlocked position against the force of a spring (22), and held in the direction of the axis (x) with the aid of a locking projection (SV) interacting with a locking portion (ST) in the receiver (14). In order to improve this type of pliers (1) in the present invention, while maintaining high usability, especially in terms of easy assembly of the pivot bolt, the locking lug (SV) and the locking part (ST) are designed to pass through each other while suppressing the action of the spring 22 during assembly.

Description

[Technical field]

[0001] The invention relates to pliers with two pliers arms intersecting firstly at a pivot bolt, one of which is movable and the other fixed, with a handle part formed on one side of the pivot bolt and interacting jaws in the form of a proboscis formed on the other side of the pivot bolt, the fixed pliers arm further having a longitudinal slot with teeth, and in which the pivot bolt arranged in the receiver can be moved about its axis against the force of a spring from an engagement position with the teeth to a release position and is held in the axial direction with the aid of a locking lug interacting with a locking lug on the receiver.

[0002] The invention relates to pliers with two pliers arms intersecting at a pivot bolt, one of said pliers arms being movable and the other pliers arm being fixed, a handle part being formed on one side of the pivot bolt and an interacting jaw in the form of a prong being formed on the other side of the pivot bolt, whereby the fixed pliers arm further comprises a longitudinal slot with teeth, and whereby the pivot bolt arranged in the receiver can be moved about its axis against the force of a spring from a position of engagement with the teeth to a position of release.

[0003] The invention further relates to pliers with a movable pliers arm and a fixed pliers arm, the fixed pliers arm being provided with rigidly connected jaws, in which case the movable jaws on the fixed pliers arm can be moved in a further guided manner by the movable pliers arm. To vary the jaw opening width, the movable pliers arm further interacts with a longitudinal slot provided with teeth in a separable form attached by a pivot bolt, which is arranged on the movable pliers arm in the region of its pivot and is provided with a pawl, and in which case the movable pliers arm interacts with the movable jaw in a lever-like manner by means of an engagement protrusion arranged on the movable pliers arm and which engages in a recess provided on the movable jaw. [Background technology]

[0004] Pliers of this type are known in different variants, for example in the form of pipe wrenches or water pump pliers, as well as in the form of so-called pliers wrenches or slip joint pliers. In order to vary the width of the jaws, it is known in this respect to release the engagement between the teeth in the region of the longitudinal slot and the pivot bolt only as a result of a pivoting movement about a geometric axis and against the force of a spring, in order to allow a sliding movement of the movable pliers arm relative to the fixed pliers arm along the longitudinal slot. The engagement is then released by a pivoting movement about the axis of the pivot bolt. Pliers designed in this way are known, for example, from DE 199 5 10 15 20 25 30 35 40 45 50 55. In the prior art, the pivot bolt is fixed in the direction opposite to the insertion direction of the installation by a collar which forms a locking projection and which can be placed on the pivot bolt after the installation of the pivot bolt. The collar then interacts with the opposing outer surface of the movable pliers arm which surrounds the receiver. The region of the pliers arm which surrounds the receiver then forms a lock which prevents the pivot bolt from being displaced in the axial direction. The collar forming the locking projection can be releasably fixed, for example by screwing or riveting, to the pivot bolt, and when viewed over its circumference, the collar projects at least partially beyond the outer contour of the pivot bolt in the region of its opposing toothing.

[0005] Pliers with jaws which can be moved in a guided manner on a fixed pliers arm are known, for example from DE 10 200 03 133 A1. Pliers of this type are also referred to as so-called pliers wrenches. No. 5,399,633 discloses a pliers in which the pivot bolt, in one embodiment, is slidably movable along the pivot shaft to disengage, with the drive lug having a length such that the pivot bolt is also retained in the drive recess in the operative position. US Pat. No. 5,399,633 discloses a so-called autopliers, which is based on actuation into a closed position against the force of a spring acting directly between the pliers arms, the pivot bolt simply creating a tooth engagement against the force of the spring when gripping an object. Further reference is made to US Pat. No. 5,399,633, where the pivot bolt is moved out of the engaged position by pivoting the pliers arms against the force of a spring, but remains in the attached position by riveting or interlocking with a counterpart. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] European Patent Application Publication No. 3313619 [Patent Document 2] European Patent Application Publication No. 2596912 [Patent Document 3] German Patent No. 3929323 [Patent Document 4] DE 102007049032 [Patent Document 5] DE 10343412 A1 [Patent Document 6] DE 102015110060 Summary of the Invention [Problem to be solved by the invention]

[0007] In view of the above-mentioned prior art, the present invention is based on the object of improving pliers of this type while maintaining a high ease of use, in particular in terms of easy installation of the pivot bolt. With regard to pliers with jaws that can be moved on a fixed pliers arm by being guided, the present invention has the object of designing pliers that are advantageous in terms of handling. [Means for solving the problem]

[0008] In the first ingenious idea, this objective is achieved by means of pliers. CanIt is proposed therein that the locking projection and the locking part are designed to pass through each other during the installation process. In that case, the spring action is suppressed. An advantageous installation of the pivot bolt is achieved as a result of this design. For its installation, the pivot bolt is moved linearly relative to the receiver, where it is possible for the locking projection and the locking part to pass through each other. During the installation process, for example, the locking projection of the bolt can pass through the locking part of the pliers arm from the outer position of the pliers arm to the inner position of the pliers arm, where the pivot bolt is inserted substantially along its axis. The spring action is interrupted during this installation process, for example by intentionally keeping the spring in a tensioned position in which no force can be exerted. The pivot bolt can then be moved directly or by user intervention, for example by pivoting the pivot bolt about its axis, into a holding position acting in the direction of the axis. This return pivoting movement is advantageously realized by releasing the spring action. It is preferred and advantageous for the locking projection to directly form part of the pivot bolt, and furthermore said locking projection is preferably realised integrally with the pivot bolt and its opposing toothing and, if applicable, homogeneously in the material.

[0009] Advantageous tool-free installation is thereby achieved.

[0010] According to another inventive idea, the above mentioned object can be achieved in that the receiver is formed with a bottom on the movable pliers arm.

[0011] The receptacle is therefore preferably closed on one axial side, the axial depth of the receptacle being limited in such a way that the base can simultaneously form an axial movement block for the pivot bolt in the axial direction.

[0012] In addition, the corresponding pliers arm part of the movable pliers arm is realised in a closed form due to the proposed bottom design of the receiver, which, if applicable, simplifies cleaning and maintenance of the pliers and, optionally, also the installation of the pivot bolt.

[0013] With regard to pliers with jaws that can be moved on a fixed pliers arm by being guided, the above-mentioned object can be achieved by other potential solutions: The locking projection is substantially radially aligned with respect to the rotation axis like the engagement projection, and the locking projection has a locking surface substantially radially aligned with respect to the rotation axis, Achievable 。

[0014] By the interaction of an additionally provided locking projection with the movable jaw, the movable jaw can be fixed against undesired movements of the movable jaw relative to the fixed pliers arm. For example, the predefined pivot position of the movable pliers arms relative to one another, in which said fixation is achieved as a result of the interaction of the locking projection with the movable jaw, can be a position in which the teeth of the pivot bolt are released from the longitudinal slot and / or the engagement projection is released from the recess provided on the movable jaw. During the pivoting movement of the movable pliers arm relative to the fixed pliers arm to the predefined pivot position, for example a transition of engagement from the engagement projection interacting with the recess of the movable jaw to the locking projection interacting with the movable jaw is further achieved, whereby after a possible interruption of the interaction of the engagement projection with the recess of the jaw, the mobility of the movable jaw on the fixed pliers arm is brought about only with a movement of the movable pliers arm along the longitudinal slot.

[0015] In this manner, the movable jaw always remains in a captured manner on the fixed pliers arm regardless of the pivotal position of the movable pliers arm relative to the fixed pliers arm.

[0019] Furthermore, the bottom of the receiver may be realised homogeneously and preferably integrally in material with the pliers arms, in particular the movable pliers arm.

[0020] In a preferred refinement of the subject matter of the invention, the spring can prevent the assembled pliers from reaching a mounting position that would prevent removal of the pivot bolt during normal handling or operation of the pliers. A position that would allow removal of the pivot bolt is preferably not reached even during normal operation or use of the pliers.

[0021] Indeed, a separate tool is preferably required to reach such a removal position, in which case the pivot bolt must be acted upon by said tool to counteract the spring force.

[0022] In a possible embodiment, the receiver can also be formed in the movable pliers arm, which in this case surrounds the fixed pliers arm in a fork-like shape in the area of ​​the longitudinal slot, the receiver being formed only in the area of ​​the branching arms of such a fork-shaped design of the movable pliers arm.

[0023] In the installed position of the pivot bolt, inter alia the locking projection can interact with an inner surface of the receiver facing the fixed pliers arm, in particular with regard to holding the pivot bolt in the axial direction. The locking projection of the receiver is therefore provided with a locking surface for the locking projection such that the pivot bolt is captured in the axial direction after its installation, in particular in the direction opposite to the installation direction. The surface of the locking projection which interacts with the locking projection is preferably located in a hidden position, e.g. at least in an area which is inaccessible or normally inaccessible during normal use of the pliers.

[0024] The receiving part has an insertion opening with a widened region, which is preferably part of the receiving part. The pivot bolt is inserted through the insertion opening substantially in the axial direction during the installation process. In this case, a locking projection, which is preferably provided on the pivot bolt, is guided through the widened region of the insertion opening in order to subsequently pass over the locking part of the receiving part. The cross-sectional area of ​​the locking projection transverse to the axis can be adapted to the open area of ​​the widened region as viewed in the same cross-section. Thereby, a certain keyhole design can be realized, in which the keyhole is formed by the insertion opening with the widened region and the key shank with the key bit is formed by the pivot bolt with the locking projection.

[0025] The pivot bolt must be placed in a selected pivot position with respect to the axis and in the region of the longitudinal slot in order to pass through the insertion opening. This pivot position of the pivot bolt preferably does not correspond to the normal handling position of the pivot bolt when the pliers are used. The actually selected pivot position is preferably intended exclusively for the installation of the pivot bolt and optionally for the intentional removal of the pivot bolt.

[0026] In another possible embodiment, the pivot bolt can have an elastic barb for preloading the toothing. The elastic barb can be a spring element which is arranged on the pivot bolt and acts directly or indirectly against a support surface, in particular a support surface of the fixing arm. In this case, the support surface can be provided in the region of the longitudinal slot and can preferably be located substantially opposite the toothing of the slot.

[0027] In other embodiments, the elastic return member may consist of a pressure spring, for example a cylinder pressure spring, which acts on a separable support member, for example in the shape of a ball.

[0028] In order to release the engagement during the desired adjustment of the width of the nose, the engagement must be released by a movement of the pivot bolt about its axis, the pivoting movement of the pivot bolt being carried out against the restoring force of an elastic barb.

[0029] The elastic barb can move to a certain pressurized position during the passage of the pivot bolt with the locking lug through the insertion opening with the widened region at a selected pivot position of the pivot bolt, which may for example be a position of maximum possible compression of the barb.

[0030] It is preferred that this constant pressurized position is not reachable during normal use of the pliers, and therefore it is also preferred that the pivot position of the pivot bolt selected for passage through the entry port is not reachable during normal use of the pliers, thereby preventing a user from unintentionally releasing the latched hold of the pivot bolt on the pliers arms.

[0031] In addition, the pivot bolt can be accommodated in a part of the receiver that is designed only partially circular and that has a driving shoulder, which acts outside the circular range to interact with a driving surface of the pivot bolt, the pivot bolt being rotatably guided in a circular recess of the receiver, the circular recess defining a circular line, and the driving shoulder projecting radially inwardly relative to the circular line and the driving surface likewise formed within the circular line.

[0032] The driving shoulder of the pivot bolt may extend within a preferably circular profile of the pivot bolt in a plane extending perpendicular to the axis of the bolt.

[0033] The pivoting movement of the pivot bolt for disengagement can preferably only be performed intentionally. For this purpose, the jaws are opened beyond the normal angle by the movable pliers arms. Disengagement is achieved simply by a corresponding pivoting or rotating movement of the pliers arms relative to one another. No additional manual intervention by the user is required in the area of ​​the pivot bolt.

[0034] Furthermore, the proposed design of the pivot bolt is also important in itself, regardless of the design of the pliers, in that the pivot bolt can only move about its axis, and not along its axis, during normal operation.

[0035] In other embodiments, the jaws of the pliers can be designed to be movable relative to a pliers arm, for example a fixed pliers arm, and the pliers can thus be realised, for example, in the manner of a pliers wrench.

[0036] In the design of the pliers according to the features of the first and second paragraphs of claim 17, it is advantageously provided that the locking projections are substantially radially aligned with respect to the axis of rotation as are the engagement projections, and that the locking projections are provided with locking surfaces which are substantially radially aligned with respect to the axis of rotation. It is preferably arranged in such a way that, upon interaction with the locking projection, it prevents movement of the movable jaw relative to the movable pliers arm and / or opposite to the direction of the fixed jaw.

[0037] In another preferred embodiment, the engagement surface may be part of a locking recess, in which the locking projection is located in a predefined pivot position of the movable pliers arm, where a form-fitting engagement of the locking projection in the locking recess is achieved in the predefined pivot position such that the movable jaw optionally prevents movement relative to the movable pliers arm in the direction of the fixed jaw and in the opposite direction.

[0038] The predetermined pivot position of the movable pliers arm relative to the fixed pliers arm may further correspond to a pliers open position. The pliers open position specifying the predetermined pivot position may be a position of the movable pliers arm relative to the fixed pliers arm in which disengagement between the pivot bolt and the longitudinal slot is achieved, whereby the movable pliers arm can move slidably along the longitudinal slot together with the movable jaws to vary the jaw opening width. [Brief description of the drawings]

[0039] The present invention will be described in detail below based on the accompanying drawings. However, the drawings show only exemplary embodiments. Therefore, parts that are described based on one of the exemplary embodiments and cannot be replaced with different parts in another exemplary embodiment will also be described as parts that potentially exist in other exemplary embodiments. [Figure 1] FIG. 1 shows a perspective view of a type of pliers in a first embodiment. [Diagram 2] FIG. 2 shows a side view of the pliers with the jaws in a closed position. [Diagram 3] FIG. 3 shows a view seen from the arrow III in FIG. [Figure 4] FIG. 4 shows an exploded perspective view of the pliers. [Diagram 5] FIG. 5 shows a perspective view of one of the pliers pivot bolts with a locking projection and a resilient barb integrally formed on the pliers. [Figure 6] FIG. 6 shows another perspective view of the pivot bolt in FIG. [Figure 7] FIG. 7 shows another perspective view of the pivot bolt. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 3, for an intermediate position in the installation process of the pivot bolts. [Figure 9] FIG. 9 shows a further view of FIG. 8 in the position after the pivot bolt installation is completed. [Figure 10] FIG. 10 shows a section through line XX in FIG. 2 and the arm receiver with respect to the operable mounting location of the pivot bolt. [Figure 11] FIG. 11 shows a cross-section along line XI-XI in FIG. 3, for the spout closed position. [Figure 12] FIG. 12 shows a cross-section according to FIG. 11, for the open position of the spout. [Figure 13] FIG. 13 is a cross-sectional view corresponding to FIG. 12, but for the pivot position of the pivot bolt for adjusting the width of the nose. [Figure 14] FIG. 14 is a cross-sectional view according to FIG. 9 and related to the position in FIG. [Figure 15] FIG. 15 shows a perspective view of pliers according to the second exemplary embodiment. [Figure 16] FIG. 16 shows a side view of the pliers according to FIG. 15 with the jaws in a closed position. [Figure 17] FIG. 17 shows a view seen from the arrow XVII in FIG. [Figure 18]FIG. 18 shows an exploded perspective view of the pliers. [Figure 19] FIG. 19 shows the section XIX-XIX in FIG. 17, relating to an intermediate position in the installation process of the pivot bolt. [Figure 20] FIG. 20 shows a further view of FIG. 19 in the position after pivot bolt installation is complete. [Figure 21] FIG. 21 shows a cross-section along line XXI-XXI in FIG. 17, for the closed nose position. [Figure 22] FIG. 22 shows a cross-section according to FIG. 21 for the open position of the spout. [Diagram 23] FIG. 23 shows a cross-sectional view corresponding to FIG. 22, but for the pivot position of the pivot bolt to adjust the width of the nose. [Figure 24] FIG. 24 shows a cross-section according to FIG. 20 and related to the position in FIG. [Diagram 25] FIG. 25 shows an enlarged detail of area XXV in FIG. 16, relative to its location in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] First, pliers 1 in the form of a water pump pliers according to a first embodiment will be described with reference to Figs. 1 and 2.

[0041] The pliers 1 comprise two pliers arms 2 and 3 which intersect at a pivot bolt 4, in the following description pliers arm 2 will be referred to as the fixed pliers arm and pliers arm 3 as the movable pliers arm. The pliers arms 2 and 3 of the pliers 1 in the first embodiment form handle portions 5 and 6 on one side of the pivot bolt 4, and jaws 7, 8 on the other side of the pivot bolt 4, which are preferably realised integrally and homogeneously in material with the handle portions 5 and 6 and which define a jaw M.

[0042] A second embodiment of the pliers 1 is shown by Figures 15 to 25, in which only the fixed pliers arm 2 is rigidly connected to the fixed jaw 7, whereas the movable jaw 8 is preferably held on the fixed pliers arm 2 so as to be linearly guided relative to the movable pliers arm 3.

[0043] For this purpose, the arm part 12 of the fixed pliers arm 2 may be realised in the form of a support plate provided with two guide grooves 40, each machined on the outer surface and preferably extending symmetrically with respect to the central axis of the pliers.

[0044] A guide projection 41 of a guide part 42 on the movable jaw 8 surrounds the arm part 12 in this area in a fork-like manner and engages in the guide groove 40 so that the jaw 8 is held and guided on the fixed pliers arm 2 like a sliding carriage.

[0045] The sliding movement of the movable jaw 8 on the fixed pliers arm 12 is realized as a result of a pivoting movement of the movable pliers arm 3. For this purpose, the movable pliers arm 3, which in a fork-like form surrounds the support plate of the fixed pliers arm 2, has at each branch an engagement projection 43 which projects essentially radially with respect to the axis and which engages in a preferably contour-matched recess 44 of the jaw 8 in the region of the guide section 42. The interaction between the engagement projection 43 and the recess 44 thus converts the pivoting movement of the movable pliers arm 3 into a linear movement of the movable jaw 8 along the guide groove 40. The movable jaw 8 can thus be moved by the pivoting movement of the movable pliers arm 3 in the direction of the jaw's closed position or in the direction of the jaw's open position, respectively.

[0046] The pliers arm 3 is pivotable relative to the pliers arm 2 about the geometric axis of the pivot bolt 4 to vary the width of the jaw M formed between the jaws 7 and 8.

[0047] The fixed pliers arm 2 is provided with a longitudinal slot 9 in the region where the pliers arms 2 and 3 intersect. If the pliers 1 is realised in the form of a pliers wrench, as shown in Figures 15 to 25, the longitudinal slot 9 runs essentially parallel to the guide groove 40. In the normal handling position of the pliers 1, this longitudinal slot 9 is passed through by the pivot bolt 4. The geometrical axis x of the pivot bolt 4 preferably runs perpendicular to the plane defined by the contour of the outer circumferential edge of the longitudinal slot 9.

[0048] The movable pliers arm 3 is preferably designed in the form of a fork in the area where the pliers 2 and 3 cross and has parallel branches 10 and 11 located at a distance from each other and on either side of an arm portion 12 of the fixed pliers arm 2 which is provided with a longitudinal slot 9. 2 is inserted through the branched region 13 of the movable pliers arm 3.

[0049] The pivot bolt 4 is rotatably held in branches 10 and 11 of the movable pliers arm 3. One branch 10 may be provided with an insertion opening 27 and is circular in the plan view according to Fig. 2 or 16, while the other branch 11 may have, for example, a pin-shaped central projection on its inner surface facing the arm 12. 15 The insertion hole 27 and the central protrusion can be provided. 15 is part of the receiver 14 for the pivot bolt 4.

[0050] The pivot bolt 4 is held in the direction of the axis x as a result of the back engagement, with a locking projection SV of the bolt interacting with a locking point ST of the receiver 14.

[0051] According to the illustrated exemplary embodiment, the locking projection SV in this case can be designed in the form of a finger-like projection, which is preferably realized integrally and uniformly in the material with the pivot bolt 4 and extends essentially radially with respect to the axis x.

[0052] The stop ST is preferably formed by the movable pliers arm 3, preferably by the branch 10 with the insertion opening 27. The stop ST may further be formed by a pliers arm surface facing the arm portion 12 and surrounding the insertion opening 27.

[0053] Thus, in the normal handling position, the pivot bolt 4 is on the one hand a central projection 15 on the other hand, as a result of the support of the locking projection SV on the locking portion ST or on the opposing inner wall of the branch 10, it is captured in the axial direction between the branches 10 and 11 of the movable pliers arm 3.

[0054] The pivot bolt 4 may be provided with an elongated support structure 16, preferably in a section perpendicular to the axis x, in the region which passes through the longitudinal slot 9 in the pliers arm 2 during normal use of the pliers 1. Outwardly facing and axially aligned pawls 17 may project radially beyond the support structure 16 in order to interact with teeth 19 formed on a side surface 18 assigned to the longitudinal slot 9. The sliding stop of the movable pliers arm 3 relative to the pliers arm 2 is reached when the pawls 17 engage with the teeth 19.

[0055] The holes 20 holding the elastic springs 21 are essentially ratcheted in the area of ​​the axis x. 17 2, the support structure 16 is further provided with a barb 21, which is preferably constituted by a spring 22, which, in the normal handling position, is held in the bore 20 and acts against a side 23 opposite the side 18 provided with the teeth 19, via a ball 25 which projects beyond a surface 24 of the support structure 16 which is open and free to rest thereon. This acts as a pawl for the pivot bolt 4. 17 and the toothing 19 in the region of the longitudinal slot 9.

[0056] The spring 22 may for example be realised by a cylinder pressure spring.

[0057] The support structure 16 of the pivot bolt 4 carries a collar 26 in the form of a circular disk, the thickness of which, viewed in the direction of the axis x, can essentially correspond to the material thickness of the branch 10 in the same direction. In the normal handling position, the collar 26 guides the pivot bolt 4 in a substantially diametrically matched insertion opening 27 in the branch 10 which is rotatable about the axis x.

[0058] In plan view, axis x is shown as a dot, with support structure 16 having segments 28 essentially diametrically opposed to one another, with the radius with respect to axis x substantially coinciding with the radius of collar 26 .

[0059] In plan view, the segments 28 are interconnected by drive surfaces 29 and 30 which extend substantially linearly.

[0060] The pawls 17 are formed on the drive face 29 in the region of the support structure 16 which passes through the longitudinal slot 9. These pawls protrude freely beyond the surface of the drive face 29.

[0061] Equipped with spring 22 and ball 25 The hole 20 for receiving the return member 21 is , good Preferably, it is provided in the area of ​​the opposite drive face 30 .

[0062] A finger-like radially projecting locking projection SV is formed in the region of the segment 28 connecting the drive faces 29 and 30 (see in particular Figures 5 to 7). In this case, the locking projection SV preferably projects beyond the disk-shaped collar 26.

[0063] Generally speaking, the pivot bolt 4 is formed in an imaginary cylinder, preferably with the exception of the locking projection SV, which projects beyond the cylinder or beyond the collar 26, respectively, with a projection dimension which corresponds approximately to 1 / 3 to 1 / 5, preferably about 1 / 4, of the dimension of the radius of this imaginary cylinder.

[0064] The installation of the pivot bolt 4 for connecting the pliers arms 2 and 3 in an articulated manner preferably occurs without tools as a result of the locking portion ST and the locking projection SV passing through each other.

[0065] For this purpose, the receiving part 14 or the insertion opening 27 formed in the receiving part 14, respectively, is provided with a slot-shaped widened region 35 which is substantially radially widened. With regard to its contour and dimensions, this widened region is preferably adapted to the bolt locking projection SV in the radial as well as in the circumferential direction, so that the locking projection SV can pass through the widened region in the direction of the axis x (see Figures 4 and 8, as well as Figures 18 and 19).

[0066] In order to allow the passage of the pivot bolt 4 through the insertion hole 27 during the bolt installation process, the pivot bolt 4 is first placed in a selected pivot position with respect to the axis x such that the locking lug SV overlaps the widened region 35. In this case the movable pliers arm 3 must be positioned relative to the fixed pliers arm 2 with the longitudinal slot 9 in such a way that the pivot bolt 4 can be inserted through the insertion hole 27 with the widened region 35 and thereafter through the longitudinal slot 9.

[0067] To achieve this insertion during the installation process, the barb 21 of the bolt must then be manually pressed in this selected pivot position, i.e., to a constant pressure position as shown in Figure 8 or Figure 19, respectively, to first allow it to pass through the insertion hole 27 and then through the longitudinal slot 9.

[0068] For example, in the mounted position limited by the interaction of the central projection 15 with the recess 32 of the pivot bolt 4, the elastic barb 21 supported on the side surface 18 of the longitudinal slot 9 induces a pivoting movement of the pivot bolt 4 in the direction of engagement, whereupon the locking projection SV leaves the widened region 35 of the insertion opening 26 and moves in front of the surface (locking portion ST) surrounding the insertion opening 26 in the locked state (see Figures 9 and 20). This in effect results in a connection which completes the insertion process along the axis x.

[0069] Therefore, the attachment is preferably performed according to a keyhole mechanism.

[0070] An end face 31 of the pivot bolt 4 facing away from the collar 26 may be aligned with a surface of the prong 11 with the central projection 15 facing away from the pliers arm 2 .

[0071] The end face 31 of this bolt is preferably provided with a central recess 32 which contains the axis x and in which the central lug 15 seats in the normal handling position of the pliers 1 .

[0072] The locking projection SV and the pawl 17 preferably extend from the collar 26 over only a portion of the length of the pivot bolt 4 when viewed in the direction of the axis x, so that the end region of the pivot bolt 4 which interacts with the recess 33 surrounding the central projection 15 and in which the recess 32 is provided is defined only by the drive faces 29 and 30 and the segment 28.

[0073] The recess 33 is designed opening towards the arm part 12 and may have a contour in the form of a circular line which, with respect to the plan view of the recess 33, extends over approximately 270°, as shown, for example in FIG. 11, with the centre of said contour lying on the axis x. The circular line K of this contour preferably has the same or almost the same diameter as the insertion opening 27 of the receiving part 14. Over the remaining approximately 90°, the recess forms a radially inwardly directed ridge 37 which then forms a substantially straight driving shoulder 34, in particular in the region facing the driving face 29.

[0074] The arm wall covering the axially outer side of the recess 33 forms a bottom 38 of the receiving part 14. The receiving part 14 can therefore only be received from one side (the branch part 10 with the insertion opening 27).

[0075] The location of the raised portion 37 allows for pivotal movement of the pliers arm 3 relative to the pliers arm 2 such that, as the pivot bolt 4 is stationary during normal use of the pliers, the pliers arm 3 encounters a stop limit (overrunnable) in engaging the driving face 29 of the pivot bolt 4 to move the driving shoulder 34 and pivot to the jaw open position (see FIG. 12 or FIG. 22).

[0076] During engagement between the pawl 17 of the pivot bolt and the teeth 19 in the longitudinal slot 9, a pivoting movement of the pliers arm 3 relative to the fixed pliers arm 2 about the axis x of the pivot bolt 4 can be achieved (see Figures 9 to 11). During this engagement the jaws 7 and 8 can thus be pivoted from a jaw closed position (for example according to Figures 1 to 3 and 9 to 11 or according to Figures 20 and 21) to an jaw open position according to Figures 12 and 22 and vice versa.

[0077] The closed position of the nose is preferably a limit stop. In that case the recess 33 is provided for this purpose with an additional shoulder, which in the region of the ridge 37 forming the driving shoulder 34 is circumferentially directed opposite the driving shoulder 34 and optionally forms a stop shoulder 36. The driving face 29 of the pivot bolt 4 can optionally be moved against this additional shoulder with a limit stop in the closed position of the nose. The closed position is preferably limited by the jaw shoulder 39 connecting the branches 10 and 11 in the branch region 11 abutting against the opposing narrow surface of the arm 12 of the fixed pliers arm 2.

[0078] The toothing can preferably only be released by deliberate action thereon, in which case the width of the jaws is subsequently changed as a result of the movement of the movable pliers arm 3 with the pivot bolt 4 in the longitudinal slot 9 (see Figures 13 and 14, or Figures 23 and 24).

[0079] The engagement of the pivot bolt 4 with the longitudinal slot 9 can thereby be disengaged as a result of a further pivoting movement (arrow a) of the pliers arm 3 from the jaw open position shown in Figure 12 or 22 beyond the limited jaw open position (see in particular Figure 13 or 23). The pivot bolt 4 is pulled by a shoulder 34 supported on the drive face 29. This rotational disengagement movement can be limited by the abutment of a surface of the support structure 16 opposite the pawl 17 on the opposite side 23 of the longitudinal slot 9.

[0080] In the course of the further pivoting movement, the pivot bolt 4 is pulled in a rotating manner about the axis of rotation x by abutment with the drive counter structure 31 of the drive structure 30. This then leads to a pivoting movement of the pawl 17, against the action of the spring 18, from its position of engagement with the teeth 19 of the longitudinal slot 9, in which the ball 19 is then partially inserted into the hole 17 during said pivoting movement. The movable pliers arm 3 can be moved along the longitudinal slot 9 in this pivoting position in order to vary the width of the jaws.

[0081] Pivoting of the pliers arms 3 beyond the jaw open position to release the engagement may occur over an angle of approximately 15 to 30 degrees. The engagement can preferably be released from any latched position along the longitudinal slot 9.

[0082] The meshing between the pivot bolt 4 and the teeth 19 in the longitudinal slot 9 can be restored again as a result of the pivoting movement of the movable pliers arm 3 and the associated pivoting movement of the pivot bolt 4 .

[0083] As shown in FIG. 9 or 20 (jaw closed position) and in FIG. 12 or 22 (jaw open position) and FIG. 14 or 24 (jaw adjustment), the pivot position selected for installation of the pivot bolt 4 relative to the insertion opening 27 or widened area 35 cannot be reached during normal use of the pliers 1. The pivot range stop of the movable pliers arm 3 relative to the fixed pliers arm 2 prevents the pivot bolt 4 from being pulled into the selected pivot position. Unwanted and accidental removal of the pivot bolt 4 during normal handling of the pliers 1 is eliminated. Tool-less removal of the pivot bolt 4 is also prevented.

[0084] This is particularly shown in the enlarged detail view of Fig. 25. When the pliers 1 are implemented in the form of a pliers wrench in Figs. 15 to 25, the engagement projection 43 formed on the pliers arm tends to move out of the recess 44 of the movable jaw 8 at a predefined pivot position of the movable pliers arm 3 which has reached the nose adjustment position. Furthermore, the movable pliers arm 3 is provided with a locking projection 45 in order to prevent a possible escape movement of the movable jaw 8 relative to the movable pliers arm 3 in this nose adjustment position.

[0085] The locking projection 45, which like the engagement projection 43 is substantially radially aligned with respect to the axis x, further comprises a locking surface 46 which is designed a short distance away from the engagement projection 43 in the opening pivot direction of the movable pliers arm 3 with respect to the axis x of the pivot bolt 4 and which is substantially radially aligned with respect to the axis x. The radially outer end of the locking surface 46 can merge into a segment-shaped outer contour 47 of the region of the movable pliers arm 3 surrounding the insertion opening 27.

[0086] The movable jaw 8 is provided with a locking recess 48, which is substantially open at its end in the direction of the movable pliers arm 3 and is located at a distance from the recess 44 in the direction of the guide groove 40. This locking recess is provided with an engagement surface 49, which is aligned substantially transversely with the longitudinal extent of the guide groove 40 or with the sliding direction of the movable jaw 8 of the fixed pliers arm 2 and which preferably merges into a substantially segmental abutment surface 50 in the region of its end facing away from the axis x of the pivot bolt 4.

[0087] The locking projection 45, like the corresponding locking recess 48, is preferably provided only on one side of the movable pliers arm 3, in particular on the arm side which also has the insertion opening 27 for the pivot bolt 4, but also on one side of the movable jaw 8 which overlaps with the support plate of the fork-shaped fixed pliers arm 2.

[0088] The transition from the state of interaction between the engagement projection 43 and the recess 44 to the state of interaction between the locking projection 45 and the locking recess 48 for the connection between the movable arm 3 and the movable jaw 8 can be realised in the course of a pivoting movement of the movable pliers arm 3 for disengagement of the meshing between the pivot bolt 4 and the longitudinal slot 9 according to Fig. 24. In a predefined pivoting position of the movable pliers arm 3, in which the meshing between the pivot bolt 4 and the longitudinal slot 9 is disengaged, the locking projection 45 can furthermore engage in the locking recess 48 of the movable jaw 8, thereby preventing a movement of the movable jaw 8 relative to the movable pliers arm 3. Furthermore, the locking projection 45 with its locking surface 46 can optionally act in a limiting manner against an engagement surface 49 of the locking recess 48 and / or against an outer contour 47 of circular cross-sectional shape with a preferably contoured abutment surface 50 for this purpose.

[0089] According to FIG. 25, a contoured shape suitable for positioning to substantially fill the locking recess 48 is achieved between the movable jaw 8 and the movable pliers arm 3 .

[0090] As a result, the movable jaw 8 can also only move along the guide groove 40 in order to vary the jaw width together with the movable pliers arm 3 in this given pivot position of the movable pliers arm 3 .

[0091] The foregoing description serves to clarify all inventions contained in this application, each of which independently improves upon the prior art by at least one combination of the following features, where two, more or all of these combinations of features may also be combined with each other:

[0092] The pliers are characterized in that the locking projection SV and the locking portion ST are designed to pass through each other during the installation process, in which case the action of the spring 22 is suppressed.

[0093] Pliers, characterized in that the receiving part (14) is formed with a bottom (38) on the movable pliers arm (3).

[0094] Pliers characterised in that the base 38 is realised uniformly in material with the pliers arms 3.

[0095] Pliers characterized in that in the assembled pliers (1), the spring (22) is prevented from reaching the mounting position.

[0096] Pliers, characterized in that the receptacle (14) is formed on the movable pliers arm (3).

[0097] Pliers characterised in that the locking projection SV interacts with the inner surface of the receiving part (14) facing the fixed pliers arm (2).

[0098] Pliers, characterized in that the receiving part (14) has an insertion opening (27) with an enlarged region (35).

[0099] Pliers characterized in that the locking projection SV can pass through the widened region.

[0100] Pliers, characterised in that in order for the pivot bolt (4) to pass through the insertion opening (27), it must be placed in a selected pivot position with respect to its axis (x) and in the region of the longitudinal slot (9).

[0101] Pliers characterized in that the pivot bolt (4) has a resilient barb (21) for applying compressive stress to the teeth.

[0102] Pliers characterized in that the resilient barb members (21) are moved to a constant pressurized position in the course of passing through a selected pivot position.

[0103] A pair of pliers characterized in that a constant pressurized position is never reached during normal use of the pliers.

[0104] 1. Pliers, characterized in that the pivot bolt 4 is received in a part of the receiving part 14 which is designed only partially circular and which has a driving shoulder 34, the driving shoulder 34 deviating from a circular extent and serving to interact with a driving surface 29 of the pivot bolt 4, wherein the pivot bolt 4 is rotatably guided in a circular recess 33 of the receiving part 14, and the circular recess 33 defines a circular line, wherein the driving shoulder 34 projects radially inward with respect to the circular line K and the driving surface 29 is likewise formed in the circular line K, and wherein the recess 33 is preferably partially circular.

[0105] Pliers characterized in that a locking projection (45) is formed on the movable pliers arm (3), said locking projection engaging with the movable jaw (8) in a predetermined pivot position of the movable pliers arm (3) and thereby preventing possible escape movement of the movable jaw (8) relative to the movable pliers arm (3).

[0106] Pliers, characterized in that the movable jaw (8) is provided with an engagement surface (49) which is acted upon by a locking projection (45) in a given pivot position of the movable pliers arm (3).

[0107] A pair of pliers characterized in that the engagement surface (49) is a part of a locking recess (48), and the locking projection (45) is located therein when the movable pliers arm (3) is in a predetermined pivot position.

[0108] A pair of pliers characterized in that a predetermined pivot position of the movable pliers arm (3) corresponds to an open position of the pliers (1).

[0109] All disclosed features are essential to the invention (both by themselves and in combination with one another). The disclosure of the present application includes in its entirety the disclosure content of the relevant / added priority documents (copies of the earlier application), also with a view to incorporating the features of these documents into the claims of the present application. The dependent claims are characterized by an independent, inventive further development of the prior art, even without the features of the claims cited, in particular in order to file a divisional application on the basis of these claims. The invention specified in each claim may additionally have one or more features specified in the preceding description, in particular those given reference signs and / or specified in the explanation of the signs. The present invention also relates in particular to embodiments in which individual ones of the features mentioned in the preceding description are not implemented, insofar as they are obviously unnecessary for the respective purpose of use or can be replaced by other means having the same technical effect. [Explanation of symbols]

[0110] 1 Pliers 2 pliers arms 3 Pliers Arm 4 Pivot bolt 5 Handle 6 Handle 7. Jaw 8. Jaw 9 Vertical Slots 10 Branch 11 Branch 12 Arm section 13 Branching Area 14 Receptor 15 Central protrusion 16 Support structure 17 Brake 18 Side 19 Teeth 20 holes 21 Return material 22 Spring 23 Side 24 Surface 25 Ball 26 Collar 27 Insertion port 28 Segments 29 Drive Surface 30 Drive Surface 31 End face 32 Depression 33 Recess 34 Driving shoulder 35 Widening Area 36 Shoulder 37 Ridge 38 Bottom 39 Jaw-shaped shoulder 40 Guide groove 41 Guide protrusion 42 Guide section 43 Engagement protrusion 44 Recess 45 Locking protrusion 46 Locking surface 47 Outer contour 48 Locking recess 49 Engagement surface 50 Contact surface A arrow x-axis K Circular line M Mouth ST locking part SV locking protrusion

Claims

1. A pair of pliers (1) having two pliers arms (2, 3) intersecting at a pivot bolt (4), One of the pliers arms is movable and the other pliers arm is fixed; a handle portion is formed on one side of the pivot bolt (4) and interacting jaws (7, 8) in the form of a prong (M) are formed on the other side of the pivot bolt (4); the fixed pliers arm (2) further comprises a longitudinal slot (9) provided with teeth (19); and The pliers, in which the pivot bolt (4), mounted in a receiver (14) formed on a movable pliers arm (3), can be moved in relation to its axis (x) from an engagement position with the teeth (19) against the force of a spring (22) to a release position and is held in the direction of the axis (x) with the aid of a locking projection (SV) on the pivot bolt (4) interacting with a locking portion (ST) of the receiver (14), Pliers, characterized in that the locking lug (SV) and the locking portion (ST) are designed to pass through each other during the installation process, in which case the action of the spring (22) is suppressed.

2. Pliers (1) according to claim 1, characterized in that the pivot bolt (4) is provided with the spring (22).

3. Pliers as described in claim 1, characterized in that the receiving portion (14) is formed with a bottom (38) on the movable pliers arm (3).

4. Pliers according to claim 3, characterized in that said base (38) is realised homogeneously in material with said movable pliers arm (3).

5. 5. Pliers according to claim 3 or 4, characterized in that the pivot bolt (4) is held in the direction of the axis (x) with the aid of a locking projection (SV) interacting with a locking portion (ST) of the receiving part (14).

6. Pliers according to any one of the preceding claims, characterized in that the spring (22) prevents the pivot bolt (4) from reaching a position in the assembled pliers which would allow its removal.

7. Pliers according to claim 1 or 2, characterized in that the receiver (14) is formed on the movable pliers arm (3).

8. Pliers according to any one of the preceding claims, characterized in that the locking projection (SV) interacts with an inner surface of the receiver (14) facing the fixed pliers arm (2).

9. Pliers according to any one of the preceding claims, characterized in that the receiving part (14) has an insertion opening (27) with a widened region (35).

10. Pliers according to claim 9, characterized in that said locking projection (SV) can pass through said widened region (35).

11. 11. Pliers according to claim 10, characterized in that the pivot bolt (4) must be placed in a selected pivot position with respect to its axis (x) and in the region of the longitudinal slot (9) in order to pass through the insertion opening (27).

12. Pliers according to any one of the preceding claims, characterized in that the pivot bolt (4) is provided with an elastic return element (21) including the spring (22) for preloading the engagement between the pawl (17) of the pivot bolt (4) and the teeth (19) in the region of the longitudinal slot (9). Claim 13: The pivot bolt (4) is provided with an elastic return member (21) including the spring (22) for preloading the engagement between the pawl (17) of the pivot bolt (4) and the teeth (19) in the region of the longitudinal slot (9); and 12. Pliers according to claim 11, characterized in that the elastic barb (21) is moved to a constant pressurized position in the course of the passage of the pivot bolt (4) at the selected pivot position.

14. Pliers according to claim 13, characterized in that during normal use of the pliers (1), the barb members (21) cannot reach the constant pressurized position.

15. 15. Pliers according to any one of claims 1 to 14, characterized in that the receiving part (14) is designed only partially circular and has a driving shoulder (34), the pivot bolt (4) is received in a part of the receiving part (14), the driving shoulder (34) deviates from the circular extent of the receiving part (14) and serves for interacting with a driving surface (29) of the pivot bolt (4), the pivot bolt (4) being pivotably guided in a partially circular recess (33) of the receiving part (14), the circular part of the recess (33) defining a circular line, and the driving shoulder (34) projects radially inwards with respect to the circular line (K) and the driving surface (29) is located within the circular line (K).

16. Pliers according to claim 15, characterized in that the recess (33) is part circular.

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