EP3113908B1 - Pliers - Google Patents

Description

The invention relates to a pair of pliers according to the features of the preamble of claim 1.

Such a pair of pliers having two pliers legs crossing one another in a hinge pin, one of which can be considered as stationary and the other as movable, the pliers legs forming grip sections on one side of the hinge pin and jaws cooperating as pliers mouth on the other side of the hinge pin, further wherein the hinge pin on a formed in the fixed pliers limb longitudinal slot by a meshing engagement for setting a jaw opening is selectively fixable by means of an extension of the longitudinal slot formed on this engagement teeth and one or more formed on the hinge pin mating teeth, and wherein in addition a repeal of the meshing engagement for adjusting the jaw width by depressing the hinge pin in a first direction of movement and subsequent displacement of the pliers legs with depressed hinge pin to each other or in that the Hinge pin automatically overrides one or more engaging teeth, is feasible, wherein the hinge pin moves in the overrunning of an engagement tooth in a second direction of movement, further means are provided for a movement lock, which serve to prevent the hinge pin from moving in the second direction of movement, but an adjustment to continue depressing the hinge pin allow.

Such a pair of pliers is out of the WO 2008/049850 A1 ( US 2010/0064861 A1 ) known. The automatic overflow happens in the course of a conventional displacement of the pliers legs approximately in the direction of a smaller jaw opening width out without any other action on the hinge pin is required. The overflow of the engagement teeth is actually ratchet-like. With regard to means for a movement lock, it is known to rotatably provide a head portion of the hinge pin relative to the hinge pin. For this purpose, the head part has on the underside a pin, which can be moved to achieve the movement lock in a free space between the hinge pin and an associated edge of the longitudinal slot on which the toothing opposite side. Alternatively it can also be formed a parallel to a flat side of the hinge pin provided rotary member, which is in the same way in the blocking in the said space hineinbewegbar.

These known embodiments are relatively expensive. The invention is concerned with the task of specifying a pair of pliers, which has the simplest, but also advantageous for practical handling means for achieving the movement barrier.

This object is achieved with a pair of pliers having the features of claim 1, being based on the fact that the means for the movement lock in particular with the features already stated above, solved, in which it is geared to that the movement lock at least partially on a pliers leg for a part of the engagement teeth is given and that the movement lock is given in the course of a displacement of the forceps arms to each other in the second direction of movement.

The means for achieving the movement barrier are provided at least partially, preferably predominantly, on one of the pliers limbs themselves and not or only partially provided on the hinge pin. The funds do not have to be brought separately into an operative position. The means also occur automatically each time a corresponding actuation of the forceps.

Due to the fact that the movement lock according to a displacement of the pliers legs to each other to change a mouth opening width comes into effect, the movement lock can be achieved in the course of conventional handling of the pliers. It is preferably not necessary to perform a special manipulation on a pliers leg or the hinge pin. In particular, preferably not the operation of a special adjustment is required.

The fact that the actuation lock can be achieved by retracting the hinge pin into the longitudinal slot in the opposite direction to a depression of the hinge pin, is not relevant to the user (different) movement / retraction of the hinge pin against the first direction of movement in the longitudinal slot. A first retraction position in which the movement lock is in effect and a second retraction position in which it is not.

In further detail, it is preferred that a longitudinal edge of the longitudinal slot is provided over a part of its length with a recess which allows a deeper retraction of the hinge pin. Thus, only a particular embodiment of a peripheral edge of the longitudinal slot is primarily required to achieve the desired movement lock. The fact that the recess is provided only over part of the length of the longitudinal edge of the longitudinal slot, is also readily achieved that on the other or remaining part of the length, the movement lock does not take effect.

The hinge pin has in further detail an actuating side, which is acted upon, for example, with the thumb of a user in the first direction of movement for adjustment, and one in the first direction of movement seen the operating side opposite side. The opposite side is circumferentially, relative to a circumferential direction relating to the first direction of movement, preferably formed by a cylindrical portion. It is further preferred that the cylinder portion has a different extent in the first direction of movement over the circumference.

At the cylinder portion close opposite in the direction of the operating side opposite flat portions. A first flat section may have the one or more mating teeth, wherein this first flat section is no longer flat in the area of the mating teeth in this sense. In the same way, the opposite second flat section may have a spring element arranged with a direction of action transverse to the first movement. This spring element is preferably intended to allow a ratchet-like overrunning of the engagement teeth or to allow the hinge pin from the teeth comes free at merely tensile load of the movable forceps leg transverse to the longitudinal extent of the longitudinal slot. In the region of the spring element and the second flat section not designed to be flat in the strict sense.

A flat section is achieved by a flattening of an otherwise cylindrical basic shape. Preferably, the flat portion at least partially on a flat surface.

It is further preferred that the cylinder portion of the opposite side is assigned to the second flat portion with the greater length. Accordingly, the second flat portion is in its extension in the first direction of movement lengthwise smaller than the first flat portion, which is associated with the shorter length of the cylinder portion. The length is here seen in the direction of extension of the opposing teeth.

Further, since the hinge pin on the side having the longer-mentioned cylinder extension cooperatively engages with the recess in the longitudinal slot deeper into the longitudinal slot in a direction opposite to the moving direction upon depression, the movement lock is achieved. The over the second flat side protruding spring element can no longer come into effect. The second flat side can no longer be indented the spring element are moved up to the associated surface of the longitudinal slot.

This longer portion of the cylinder portion occurs in the state of the movement lock against a recess formed on the shoulder in the longitudinal slot. Although the spring element acts on this side as well, this can not be effective due to the blockage of the movement of the hinge pin in the second movement direction required for this purpose by said shoulder. A movement of the hinge pin transversely to the longitudinal extent of the longitudinal slot is not possible in such a position of the hinge pin with respect. The length of the longitudinal slot.

Fig. 1

eine perspektivische Darstellung der Zange im unbetätigten Zustand;

Fig. 2

eine vergrößerte Darstellung des Bereiches des Längsschlitzes und des Zangenmauls, bei großer Maulöffnungsweite;

Fig.3

eine Explosionsdarstellung der Zange im Bereich des Längsschlitzes und des Zangenmauls, bezogen auf den Gelenkbolzen;

Fig. 4

einen Querschnitt durch die Zange, geschnitten in der Ebene IV-IV in Fig. 2;

Fig.5

einen weiteren Querschnitt durch die Zange gemäß Fig. 4, geschnitten in der Ebene V-V;

Fig.6

eine Herausvergrößerung des Gelenkbolzens in der Stellung gemäß Fig. 4;

Fig. 7

eine Darstellung gemäß Fig. 6, jedoch bei größter Maulöffnung;

Fig.8

eine Seitenansicht des Gelenkbolzens;

Fig.9

eine weitere Seitenansicht des Gelenkbolzens, bei gegenüber der Stellung gemäß Fig. 8 um 45° gedrehtem Gelenkbolzen;

Fig. 10

eine perspektivische Ansicht des Gelenkbolzens von schräg vorne;

Fig. 11

eine Querschnittsdarstellung der Zange entsprechend Fig. 4, jedoch bei größtmöglicher Maulöffnungsweite und aus der Eingriffsstellung gezogenem Gelenkbolzen; und

Fig. 12

einen Querschnitt durch die Zange, geschnitten entlang der Linie XII-XII in Fig. 11.

In the following, the invention will be explained further with reference to the attached drawing, which, however, represents only one embodiment. Hereby shows:

Fig. 1

a perspective view of the pliers in the unactuated state;

Fig. 2

an enlarged view of the area of the longitudinal slot and the forceps jaw, with large jaw opening width;

Figure 3

an exploded view of the forceps in the region of the longitudinal slot and the forceps jaw, based on the hinge pin;

Fig. 4

a cross section through the pliers, cut in the plane IV-IV in Fig. 2 ;

Figure 5

a further cross section through the pliers according to Fig. 4 cut in the plane VV;

Figure 6

an enlargement of the hinge pin in the position according to Fig. 4 ;

Fig. 7

a representation according to Fig. 6 , but at the largest mouth opening;

Figure 8

a side view of the hinge pin;

Figure 9

another side view of the hinge pin, in relation to the position according to Fig. 8 45 ° turned hinge pin;

Fig. 10

a perspective view of the hinge pin obliquely from the front;

Fig. 11

a cross-sectional view of the pliers accordingly Fig. 4 , but with the largest possible jaw opening and hinge pin pulled out of the engaged position; and

Fig. 12

a cross section through the pliers, taken along the line XII-XII in Fig. 11 ,

Shown and described, first with reference to the FIGS. 1 and 2 , a pliers 1, in a preferred embodiment as a water pump pliers with two pliers legs 2, 3. The pliers legs 2, 3 intersect in a region of a hinge pin 4th

The pliers leg 2 is to be regarded as a fixed pliers leg. The pliers leg 3 is relative to the pliers leg 2 for changing the mouth opening width M, see Fig. 2 , movable. At the same time the pliers leg is 3 relative to the forceps leg 2, with the hinge pin 4 as a hinge axis, pivotable to open and close the forceps jaw.

The pliers legs 2, 3 form on one side of the hinge pin 4, the handle portion 5, 6 and on the other side of the hinge pin 4 mouth jaws 7, 8th

The movable pliers limb 3 is preferably designed fork-shaped in the crossing region, for enclosing both sides of the one longitudinal slot 9 having Festschenkelabschnitts. The hinge pin 4 is rotatably supported in a section, preferably the fork section 10, 11 of the movable pliers limb 3. For this purpose, in the section or in detail in the fork portion 10 and the fork portion 11 each have a through hole 12 is formed.

On the hinge pin further formed counter teeth 13 can engage with engagement teeth 14, which are formed on a - preferably only on one flank of the longitudinal slot 9.

According to a cylinder section 15 on the hinge pin 4, in which enter the counter teeth 13, a stop is on the bottom, so on the side of the cylinder portion 15 of the mating teeth 13 in the engaged state, created, which prevents the hinge pin 4 from this side through the longitudinal slot. 9 can be inserted.

On the other side, see for example Fig. 5 , the hinge pin 4 is formed with a head portion 16 which forms a peripheral or radial projection, which occurs in the same way as a stop in action, when the hinge pin 4 of this page is depressed in a first direction of movement R ₁ for adjustment in the longitudinal slot. 9 In addition, the cylinder portion 15, see, for example Fig. 5 . but also formed with such a radial projection that it by striking the pliers leg 2 in a state in which the engaging teeth and the opposing teeth are out of engagement, see, for example. Fig. 11 , further retraction of the hinge pin 4 prevents.

The mating teeth 13 are formed on a first flat side 17 of the hinge pin 4. On an opposite second flat side 18, a spring element 19 comes into effect, with a direction of action W, transversely to the first direction of movement R ₁ , see Fig. 5 , runs. The flat sides 17, 18 are in a cross section, see, for example Fig. 11 not aligned but aligned at an acute angle to each other. This allows the movement of the hinge pin in the direction of the second direction of movement R ₂ , as explained below. This is in the narrower sense essentially a circular movement of the hinge pin.

According to the spring element 19, the hinge pin in accordance with a position of the pliers legs Fig. 11 be brought out of action by merely pulling on the first pliers leg 3. The hinge pin 4 moves in this case in the direction of a second direction of movement R ₂ . The second direction of movement R ₂ can essentially coincide with the direction of action W. In this way, the second, or movable pliers leg 3 in such a position of the hinge pin 4 with respect to the longitudinal slot 9 moves freely with respect to the first and fixed pliers legs 2 become.

The forceps 1 has a movement lock with respect to the hinge pin 4. The movement lock causes the hinge pin 4 or the movable pliers limb 3 in total to an adjustment of the mouth opening width M, ie for movement of the hinge pin 4 in a longitudinal direction of the longitudinal slot 9, which movement is also referred to as the third direction of movement R ₃ , only (still) to be moved by depression in the direction of the first direction of movement R ₁ .

The movement lock is achieved primarily by a special design of one of the pliers legs, here the fixed pliers leg 2. It is also provided only for a part of the meshing teeth with the longitudinal slot 9.

The movement lock can be due to a displacement of the forceps leg 3 from a certain mouth opening width M, here preferably the largest mouth opening according to Fig. 11 , in the direction of a smaller mouth opening effect in effect. The displacement takes place in the third direction of movement R _{3 of} the hinge pin of the hinge pin. 4

In a further detail, the movement lock is achieved in that the hinge pin 4 in the direction opposite to the first direction of movement R ₁ , where he is preferably biased by a beaufschlagende bolt spring 20, so deep, from the relevant side, in the longitudinal slot 9 retracts, see Fig. 5 in that, on the side of the spring element 19, the cylinder portion 15 is at least over part of its height in direct opposition to a stop surface 21 extending in the longitudinal direction of the longitudinal slot 9. As a result, it is no longer possible, as described above, to pull the hinge pin 4 out of the toothing engagement with the teeth of the longitudinal slot 9 while avoiding the spring element 19. The second direction of movement R ₂ is blocked.

This immersion in the longitudinal slot 9 is achieved by a stop surface 21 with forming recess 22 in a longitudinal edge 23 of the longitudinal slot 9 (see, in particular FIGS. 4 . 5 ).

This recess 22 is, as in particular also from Fig. 3 can be seen, formed only over part of the length b of the longitudinal slot 9. Another directly adjoining part a of the longitudinal slot 9 is formed without this recess 22. Correspondingly, the length of the recess 22 essentially corresponds to the difference b-a (with the exception of, for example, the mouth-jaw-side rounding area). In this case, the part a may correspond to half to, for example, 9/10 of the entire length b of the longitudinal slot 9.

More preferably, the configuration of the longitudinal slot 9 over the length a is formed only in opposition to a small part of the teeth of the longitudinal slot 9. More preferably, in comparison to a tenth to a third of the teeth of the longitudinal slot 9. In absolute terms, two to ten preferably about five engagement teeth 14 may be formed in the region of the part a. The length a also preferably corresponds to a diameter of the cylindrical part of the hinge pin 4, which is in the unactuated state in the longitudinal slot (and partly according to the flat sides 17, 18 is flattened).

The position of the hinge pin 4 with deeper immersion in the longitudinal slot 9 according to the recess 22 is again in Fig. 6 exposed. In Fig. 7 a similar representation is given, but in a region of the longitudinal slot 9, in which the hinge pin 4 is not recessed in the longitudinal slot 9 retracts.

The hinge pin 4 as such is in more detail in the FIGS. 8 to 10 shown.

On the actuation side, the hinge pin 4 has a head part 24. This is at least partially radially over and can thus form in cooperation with the teeth of the longitudinal slot 9, a stop for a depression of the hinge pin in the first direction of movement.

The substantially completely formed in the starting point with the exception of the head part hinge pin 4 is below the head part 24 with the aforementioned opposite flat sides, first flat side 17 and second flat side 18, is formed.

A foot portion 25 of the hinge pin 4 opposite the head portion 24 is initially formed with a circumferential first cylinder portion 26. Associated with the second flat side 18, this cylinder section 26, viewed counter to the first direction of movement R ₁ , is formed with a greater length L ₂ than corresponds to the first length L _{1 of} the encircling cylinder section.

The length L ₂ may, for example, be 1.1 to 1.8 times the length L ₁ .

On the surface of the head part 24 opposite bearing surface 27 of the hinge pin 4 acts in the embodiment, the bolt spring 20 (see. Fig. 2 ), which biases the hinge pin 4 in its rest or engagement position given outside an actuation.

The means for forming the movement barrier are thus given primarily by the recess 22 and the stop surface 21 in the fixed pliers limb, but partly by the different high training of the cylinder portion 15 in the hinge pin 4. By a corresponding design of a recess on the opposite longitudinal edge The longitudinal slot 9 could also be dispensed with different lengths of the cylinder portion 15 of the hinge pin 4.

Use of the pliers can now be done as follows:
Starting from a largest mouth width according to Fig. 11 a user can either by moving the pliers legs 2, 3 relative to each other, so that the hinge pin 4 moves in the direction of the third direction of movement R ₃ , reach a ratchet-like overflow of the teeth of the longitudinal slot through the mating teeth until a desired mouth opening width M is given. In this case, the hinge pin 4 moves when overrunning an engagement tooth in the second direction of movement R _2nd Or the user can, for example, in the position of the largest mouth opening width M according to Fig. 11 , By depressing in the first direction of movement R _{1 of} the hinge pin 4 bring the mating teeth 13 out of engagement with the engaging teeth 14 and then move the pliers legs in the depressed position of the hinge pin 4 in the direction of the third direction of movement R ₃ against each other to set a desired mouth width.

The ratchet-like delivery of the mouth opening is particularly favorable to perform when the pliers already a workpiece P, see. Fig. 11 and 12 , is assigned and the jaw jaws are then brought by this said moving to the plant. Regardless that in such a ratchet-like displacement of the jaws to each other to adjust a jaw width of the hinge pin 4 is already moved in the region of the longitudinal slot in which the movement lock can take effect, it allows the configuration that this delivery by ratchet-like overflow yet can be done until the end. For this purpose, however, it may be necessary that the displacement of the pliers legs or pliers jaws is performed sufficiently quickly by a user to each other. After termination of this displacement, that is, when the jaws on the workpiece P bspw. Have come to rest, for example, causes the bolt spring 20 that the hinge pin, which is then usually in the region of the recess 22, opposite to the first direction of movement R ₁ in the Longitudinal slot is pressed and hereby immediately in the position according to eg. Fig. 6 moves. This is a movement lock achieved. The hinge pin 4 can no longer by merely moving in the second direction of movement R ₂ , transversely to the first direction of movement R _{1 are moved} out of the toothing.

Rather, a further adjustment of the jaw opening of the forceps, even in the direction of a larger mouth opening, only by depressing the hinge pin 4 in the direction of the first direction of movement R _{1 is} possible, and then in the depressed state of the hinge pin 4 methods of pliers in or against the third direction of movement R. ₃ in the desired new mouth opening M.

As far as the desired jaw opening width is then given in the longitudinal region a of the longitudinal slot 9, a ratchet-like overflow, in the direction of smaller mouth opening, can be carried out without further ado from this position.

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optionally sibling version independent inventive developments of the prior art, in particular to make on the basis of these claims divisional applications.

LIST OF REFERENCE NUMBERS

1 tongs 21 stop surface 2 pliers legs 22 recess 3 pliers legs 23 longitudinal edge 4 hinge pins 24 headboard 5 handle portion 25 footer 6 handle portion 26 cylinder section 7 jaw jaw 27 bearing surface 8th jaw jaw 9 longitudinal slot 10 fork portion M Opening width 11 fork portion 12 Through opening R ₁ first direction of movement 13 against teeth R ₂ second direction of movement 14 engaging teeth R ₃ third direction of movement 15 cylinder section W effective direction 16 headboard 17 first flat side P workpiece 18 second flat side 19 spring element a Length (of the longitudinal slot) 20 pin spring b Part (of the longitudinal slot) L ₁ length L ₂ length

Claims (5)

1. A pliers having two pliers legs (2, 3) that cross at a pivot bolt, of which one pliers leg can be regarded as fixed and the other as movable with respect thereto, wherein the pliers legs (2, 3) form grip portions on one side of the pivot bolt (4) and mouth jaws (7, 8) cooperating as pliers mouth on the other side of the pivot bolt (4), wherein furthermore the pivot bolt (4) is optionally fixable in a longitudinal slot (9) formed in the fixed pliers leg (2) by toothing engagement in order to set a mouth opening width (M), by means of engagement teeth formed (14) over an extent of the longitudinal slot (9) formed thereon and one or more mating teeth (13) formed on the pivot bolt (4), and wherein furthermore a release of the toothing engagement for adjusting the mouth width is able to be carried out by pressing down the pivot bolt (4) in a first direction of movement (R₁) and subsequent displacement of the pliers legs (2,3) together with the pivot bolt (4) pressed down, or in that the pivot bolt (4) automatically passes over one or more engagement teeth (14), wherein the pivot bolt (4), on passing over of an engagement tooth (14), moves in a second direction of movement (R₂), wherein means (22) are furthermore provided for a movement block, which serve to prevent the pivot bolt (4) from moving in the second direction of movement (R₂), but which continue to permit an adjustment as a result of the pressing down of the pivot bolt (4), characterized in that the means (22) for the movement block are provided at least partially on a pliers leg (2) and with effect for a portion of the engagement teeth (14), that the movement block comes into effect for the second direction of movement (R₂) of the pivot bolt during a displacement of the pliers legs (2,3) together and that the movement block is able to be achieved by differently deep introducing of the pivot bolt (4) into the longitudinal slot (9) in the opposite direction to the pressing down of the pivot bolt (4).
2. The pliers according to Claim 1, characterized in that a longitudinal flank of the longitudinal slot (9) is provided over a portion of its length with a recess (22) which enables a deeper introducing of the pivot bolt (4).
3. The pliers according to one of the preceding claims, characterized in that the pivot bolt (4) has an actuation side and an opposite side, viewed in the first direction of movement (R₁), wherein the opposite side is formed by a cylinder portion (26), which has over the circumference a different extent in the first direction of movement (R₁).
4. The pliers according to Claim 3, characterized in that opposite flat sides (17, 18) adjoin the cylinder portion (26) in the direction of the actuation side, wherein in one of the flat sides (17, 18) the one or more mating teeth (13) are formed and in the other flat portion a spring element (19) is provided, arranged with an effective direction transversely to the first direction of movement (R₁).
5. The pliers according to Claim 4, characterized in that the cylinder portion (15) is formed associated with the other flat side (18) with the greater length.

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