EP0528252B1 - Pliers with two plierarms - Google Patents

Abstract

The pliers have two arms connected by a pivot pin (4) and adjustable in a stepwise manner to open or close the gap (M) between the jaws (5,6). The first arm (2) passes through a dividing slot in the other (3). The pin has limited axial movement in holes (14) in two side walls of the second arm and has diametrically opposed flats (19,20) which allow it to fit between the sides (12) of a slot (11) in the other arm. The slot has rack teeth on each side which engage with teeth (21) on the pin flats and lock the pin rotationally and positionally. To adjust the jaws, the pivot pin is pushed from the head end (15) against the pressure of a leaf spring (23). This moves the pin sideways out of engagement with the slot teeth so that it, together with the arm can be adjusted along the slot.

Description

The invention relates to pliers with two pliers legs, which are connected to one another by means of a hinge pin having an actuating end in the form of an articulated bolt head, the pliers mouth being formed above the crossing region and grip sections on the pliers legs below the crossing region, the one for changing the size of the Forceps jaws in the intersection area relative to the other forceps leg, gradually adjustable forceps legs penetrate a free space of the other forceps leg, further the hinge pin is guided in a bore in the other forceps leg and can be displaced transversely to the lengthwise plane of the forceps and has two cross-sectional areas adjacent to one another in the axial direction of the joint pin, one of which is coupled in the coupled Condition in positive engagement with the profiled flanks of a longitudinal slot of one pliers limb lying in the intersection area and the other cross-sectional area freely in the longitudinal leg litz is movable.

Such a pair of pliers is known from EP-A-0 116 305, the hinge pin being composed of a profiled cross-sectional area for positive engagement in correspondingly shaped flanks of a pliers leg and of a substantially thinner cross-sectional area. At its end, the thinner cross-sectional area is formed with a stop collar which, when the hinge pin is actuated in the axial direction, acts on an outside of another pliers leg facing it.

Furthermore, pliers according to US Pat. No. 1,885,895 are known in the prior art. The hinge pin of this known Pliers can be operated from both sides. However, only on one of the actuation sides is there a surface recess in the pliers leg. The diameter of this recess corresponds to the diameter of the joint bolt head. The depth of the recess is also only limited to the fact that the actuating end of the hinge pin can retract a little in this recess, but in the actuated state also protrudes beyond the surrounding surface of the pliers leg.

The invention is concerned with the technical problem of making pliers as stated at the outset more favorable in terms of handling.

This technical problem is solved in the subject matter of claim 1, with the aim being that the other pliers leg is formed on the actuating side of the hinge pin with a recess, such that the recess serves as a support for an underside of the thumb during actuation, with the impression depth of the thumb, the actuating end of the hinge pin is received in the recess when actuated.

This creates a pair of pliers with a particularly high utility value. The thumb is supported and held in the recess when actuated. In a further embodiment, it is also provided that an actuating stop which is recessed in depth is provided for the joint bolt head. The procedure here is that the free space for pushing through the pliers leg has a recess arranged on the actuating side of the hinge pin, which receives the hinge pin head when the hinge pin is actuated, and that a recessed actuation stop is provided for the hinge pin head. The structural means are simple and functional. It is particularly advantageous that the pivot pin head occurs when actuated below the level of the pliers leg side having the recess. In the basic position, the joint pin head only slightly extends beyond the plane of the pliers leg side having the recess, which makes it easier to feel the joint pin head. Advantageously, the profiled flanks of the one leg of the pliers are designed as a stop. Here, a spring loading of the hinge pin from the side opposite the hinge pin head proves to be particularly advantageous, with which the hinge pin is always shifted back into its basic position after adjustment of the jaw opening. There is thus always a positive connection between the hinge pin and the pliers leg having the profiled flanks in the basic position. Alternatively, the arrangement can also be so be met that the hinge pin is adjustably fixable by means of a locking part acting essentially perpendicular to its direction of displacement, whereby the basic position of the hinge pin is defined. A displacement of the hinge pin for the purpose of changing the pliers jaw width thus takes place against the action of a locking part, which can be provided in the region of the pliers leg having the recess. A relocation of the hinge pin takes place here willingly, the latter being manually moved back until it is fixed by the locking part. The latching part is advantageously designed as a spring-loaded ball which engages in a corresponding recess in the hinge pin. As a further advantageous embodiment, the hinge pin has an intermediate section between the positive-locking cross-sectional area and the hinge pin head, the intermediate section having a constant cross section. The cross section of the intermediate section preferably corresponds to the clear width between the profiled flanks of the one leg of the pliers. This ensures that the hinge pin is always secured against rotation and tilting, regardless of its axial position. The hinge pin head is circumferentially substantially coincident with an annular envelope surface of the hinge pin, which has the consequence that the hinge pin, regardless of its operating position, is securely supported in the axial bores of the fork ends of the other pliers leg. Advantageously, the recess arranged on the actuation side of the other pliers leg is funnel-shaped, this recess merging into the area of the axial bore. This configuration enables the hinge pin to be displaced in terms of handling in a release position, in order to change the clear width of the pliers mouth. It has proven to be particularly advantageous here to form the recess eccentrically to the joint pin head, with which the recess has an ergonomically more favorable shape that results in improved handling when the joint pin is displaced. This is further supported by the fact that the recess has a thumb size. The latter can also be slightly oval and, as already mentioned, eccentric to the hinge pin. This enables the thumb underside to roll off optimally when the hinge pin is moved. In order to prevent the thumb from slipping when a dirty (for example oil-contaminated) hinge pin is actuated, it is further provided that the hinge pin head is structured on the upper side. The latter is designed to be more grippy due to the above-mentioned measure and is therefore favorable in terms of handling. As an alternative to this, the joint pin head can also be designed as a round button part which is spherically curved upwards. In an advantageous further development, the joint pin head essentially completely fills the opening in the recess in the depressed state. In the projection, the joint pin head thus has a diameter corresponding to the opening in the recess. Furthermore, it is provided that the hinge pin head is designed separately, which is advantageously realized in that the hinge pin head is screwed onto the hinge pin base body. Another pin connection can also be provided.

According to a further embodiment it is also provided that the recess provided in the other pliers leg has such a free diameter, or the joint pin head is designed with such a dimension in relation to the free diameter of the recess that a viewing gap is present even when the joint pin head is depressed remains on the profiled flanks of one leg of the pliers. This measure proves to be advantageous, for example, if soiling occurs in the area of the profiled flanks of the one leg of the pliers. The contamination can practically not prevent the actuating head from being completely depressed. They are either pushed into the spaces between the tooth profiles, which open when the hinge pin head is pressed down, or between the edge of the hinge pin head and the edge of the surrounding recess. For this purpose, it is further advantageous that the pivot pin head in the projection in the area of its largest diameter (only) covers a tooth of the flanks of the pliers leg to about half a tooth depth. The contact area of the joint pin head on the upper transverse surface of the tooth profile, which forms the stop for the joint pin head when pressed down, is thus kept very small. This is conducive to the removal of dirt in the sense described above. It is also preferred that the pivot pin head is formed in its base from the overlay of a rounded and rectangular surface, such that the width of the rectangle corresponds approximately to the free distance between the tooth flanks, but its longitudinal extent exceeds the diameter of the rounded surface. The section of the hinge pin or the hinge pin head, which corresponds to the rectangular area, extends only within the free area between the tooth flanks of the one leg of the pliers. The rounded or circular surface is formed by the part of the hinge pin, which also forms the protrusion with respect to the tooth profile on the tooth flanks, which produces the abovementioned stop when depressed. The narrow side of the rectangular surface is also preferably rounded. These narrow sides interact directly with the other pliers leg, in which the recess is formed. For this purpose, it is expedient that the radius of the circumferential line of the narrow sides corresponds approximately to the radius of the recess. In order to prevent the other leg of the pliers from undermining by the joint pin head when depressed, which might not be entirely excluded in the case of tolerably unfavorable pairings, it is also preferred that a protrusion of the rectangular area over the circular area in profile - ie in height - the adjacent circular section of the Joint head surpasses. This measure becomes particularly clear with regard to a specific embodiment, in which the circular section is formed by its own button-like component, which has a dome-shaped curved surface. The protrusion overlaps the edge region of this button-shaped component, but in a side view the knob-like component protrudes again in its central region from the protrusion or both protrusions.

Fig. 1

eine erfindungsgemäße Zange in Seitenansicht;

Fig. 2

die andere Seitenansicht der Zange;

Fig. 3

den Gelenkbolzen in perspektivischer Darstellung;

Fig. 4

einen Schnitt gemäß Linie IV-IV in Figur 1 mit in strichpunktierter Darstellung veranschaulichter Lage des Gelenkbolzens in Freigabestellung;

Fig. 5

den Schnitt gemäß Linie V-V in Figur 4;

Fig. 6

die Rückansicht der Zange;

Fig. 7

eine Seitenansicht des Kreuzungsbereichs der Zangenschenkel zur Verdeutlichung der Blattfederzuordnung;

Fig. 8

eine Draufsicht, ausschnittsweise, auf eine weitere Ausführungsform des Gelenkbolzens;

Fig. 9

einen Schnitt durch den Gegenstand gemäß Figur 8, geschnitten entlang der Linie IX-IX;

Fig. 10

einen weiteren Schnitt durch den Gegenstand gemäß Figur 8, geschnitten entlang der Linie X-X, bei niedergedrücktem Gelenkbolzen;

Fig. 11

eine perspektivische Darstellung, etwa entsprechend Figur 3, des Gelenkbolzens der weiteren Ausführungsform, bei entnommenem Knopfteil;

Fig. 12

eine Teildarstellung gemäß Figur 1 einer alternativen Ausführungsform;

Fig. 13

einen Schnitt durch den Gegenstand gemäß Figur 12 entlang der Linie XIII-XIII;

Fig. 14

einen Schnitt durch den Gegenstand gemäß Figur 12 entlang der Linie XIV-XIV;

Fig. 15

eine Teildarstellung gemäß Figur 1 einer weiteren alternativen Ausführungsform;

Fig. 16

eine der Figur 15 entsprechende Darstellung, jedoch eine weitere Ausführungsform des Gelenkbolzens und der Ausnehmung des einen Zangenschenkels betreffend;

Fig. 17

den Schnitt gemäß der Linie XVII-XVII in Figur 16;

Fig. 18

eine weitere Teildarstellung entsprechend der Figur 16, jedoch eine weitere Ausführungsform des Gelenkbolzenkopfes und der Ausnehmung des einen Zangenschenkels betreffend;

Fig. 19

den Schnitt gemäß der Linie XIX-XIX in Figur 18;

Fig. 20

eine der Figur 18 entsprechende Darstellung, jedoch eine Ausführungsform betreffend, bei der der Gelenkbolzen ohne einen Gelenkbolzenkopf ausgebildet ist;

Fig. 21

den Schnitt gemäß der Linie XXI-XXI in Figur 20;

Fig. 22

eine Rückansicht der Zange gemäß Figur 2, jedoch eine weitere Ausführungsform betreffend, wobei der Gelenkbolzen mittels eines Rastteiles in der Grundstellung gehalten ist;

Fig. 23

den Schnitt gemäß der Linie XXIII-XXIII in Figur 22 und

Fig. 24

eine der Figur 23 entsprechende Darstellung, jedoch in niedergedrückter Stellung des Gelenkbolzens.

The invention is further explained below with reference to the accompanying drawing, which, however, only represents exemplary embodiments. Here shows:

Fig. 1

a pair of pliers according to the invention in side view;

Fig. 2

the other side view of the pliers;

Fig. 3

the hinge pin in a perspective view;

Fig. 4

a section along line IV-IV in Figure 1 with illustrated in phantom Position of the hinge pin in the release position;

Fig. 5

the section along line VV in Figure 4;

Fig. 6

the rear view of the pliers;

Fig. 7

a side view of the intersection of the pliers legs to illustrate the leaf spring assignment;

Fig. 8

a plan view, in sections, of a further embodiment of the hinge pin;

Fig. 9

a section through the object of Figure 8, taken along the line IX-IX;

Fig. 10

8 shows a further section through the object according to FIG. 8, sectioned along the line XX, with the hinge pin depressed;

Fig. 11

a perspective view, approximately corresponding to Figure 3, the hinge pin of the further embodiment, with the button part removed;

Fig. 12

a partial view of Figure 1 of an alternative embodiment;

Fig. 13

a section through the object of Figure 12 along the line XIII-XIII;

Fig. 14

a section through the object of Figure 12 along the line XIV-XIV;

Fig. 15

a partial view of Figure 1 of a further alternative embodiment;

Fig. 16

a representation corresponding to FIG. 15, but relating to a further embodiment of the hinge pin and the recess of one pliers leg;

Fig. 17

the section along the line XVII-XVII in Figure 16;

Fig. 18

a further partial representation corresponding to Figure 16, but relating to a further embodiment of the joint bolt head and the recess of the one leg of the pliers;

Fig. 19

the section along the line XIX-XIX in Figure 18;

Fig. 20

an illustration corresponding to Figure 18, but relating to an embodiment in which the hinge pin is formed without a hinge pin head;

Fig. 21

the section along the line XXI-XXI in Figure 20;

Fig. 22

3 shows a rear view of the pliers according to FIG. 2, but relating to a further embodiment, the hinge pin being held in the basic position by means of a latching part;

Fig. 23

the section along the line XXIII-XXIII in Figure 22 and

Fig. 24

a representation corresponding to Figure 23, but in the depressed position of the hinge pin.

The pliers 1 have two mutually intersecting pliers legs 2 and 3. The latter are connected to one another in an articulated manner in the region of intersection by means of a hinge pin 4. The pliers legs 2 and 3 each form a grip section 7 and 8 on the side above and below. The joint of the pliers jaw M is at an angle of approximately 45 ° to the handle sections 7, 8. The pliers leg 2 passes through a free space F of the pliers leg 3 corresponding to its thickness. The free space F is designed as a slot lying in the leg pivot plane, which has two on both sides has longitudinal sides 9 of equal thickness. The latter are of greater width than that of the handle section.

The penetrating pliers leg 2 also has a width in the area of the free space F that clearly exceeds the width of the grip section 7. This passage area is designated 10. It is approximately at right angles to the jaw 5.

To change the size of the forceps jaw M, the pincer leg 3 which is passed through can be adjusted in stages. The corresponding adjustment device consists of a longitudinal slot 11 penetrated by the hinge pin 4 in the penetrating pliers leg 2. The longitudinal slot 11 is profiled on its longitudinal slot flanks 12 running parallel to one another. It is a sawtooth-like profile. The individual tooth gaps are designated by 13 and, like the hinge pin 4, extend transversely to the pivot actuation plane of the pliers legs 2, 3.

The joint pin 4, which is guided in a bore 14 which is congruent with the longitudinal slot 11, is designed to be essentially rotationally symmetrical, viewed axially. Here, the hinge pin 4 is composed of a cylindrically shaped hinge pin head 15 and a hinge pin base part 16, the hinge pin head 15 being firmly connected to the hinge pin base part 16 by means of a screw 17. Both parts have essentially the same diameter. The hinge pin base 16 is symmetrically flattened on diametrically opposite sides, this area a being delimited on the one hand by the hinge pin head 15 and on the other hand by a hinge pin collar 18 of the hinge pin base 16. The thickness of the base part 16 of the hinge pin in the region a corresponds to the clear distance y of the longitudinal slot 11 between the longitudinal slot flanks 12, the length of the region a roughly corresponding to the addition of the width of the passage region 10 of the pliers leg 2 and a leg longitudinal wall 9 of the pliers leg 3.

In the area of the hinge pin base section a, two teeth 21 extending from the hinge pin collar 18 are formed on the flattened sides 19, 20 for positive engagement in the tooth gaps 13 of both longitudinal slot flanks 12. The length of the teeth 21 corresponds approximately to three quarters of the width x of the longitudinal slot flanks 12.

The cross-sectional area a of the hinge pin base part 16 designed in this way thus serves on the one hand to achieve the positive connection between the hinge pin 4 and the pliers leg 2 and on the other hand when the hinge pin 4 is displaced in the direction z to secure the hinge pin 4 against self-rotation.

On the actuating side of the hinge pin 4, a recess 22 extending from the bore 14 is arranged in the longitudinal leg wall 9 of the tong leg 3. This recess 22 is realized in the form of a countersink, leaving a remaining section of the bore 14. The recess 22 is therefore circular.

Contrary to the direction of displacement z, the hinge pin 4, with the exception of the exemplary embodiment shown in FIGS. 22-24, is under spring load, that is to say in order to maintain the positive engagement of the profiles. For this purpose, the hinge pin 4 is acted upon by a leaf spring 23 from the free end having a full cross section. The latter is located on the outside of the longitudinal leg wall 9 there. The area of assignment of the leaf spring 23 has a groove 24 corresponding to its shape for its recessed assignment. The leaf spring 23 takes a course adapted to the pliers leg 3, the end region of the leaf spring 23 being angled in the direction of the hinge pin 4. As can be seen in FIG. 7, the free end of the leaf spring 23 engages over a sector-shaped recess 25 on the end face of the hinge pin 4. The sector shape takes into account the swivel angle requirement of the pliers legs 2, 3, taking into account the fact that the hinge pin 4 is also non-rotatable in the uncoupled state Longitudinal slot 11 carrying pliers legs 2 is held. A relative movement, that is to say a rotary movement of the hinge pin 4, only takes place in relation to the pliers leg 3 which is penetrated. A screw 26 or another fastening element which penetrates the other end is used to fix the leaf spring 23.

In the coupled position, the circular wall sections 16 ′ of the base part of the hinge pin that have remained standing 16 peripheral support or guide zones for the hinge pin 4 on the bore wall of the bore 14 of the longitudinal leg wall 9 on the right.

On the other side of the longitudinal slot 11, that is to say the left-hand side wall 9, the full cylindrical jacket wall of the base part 16 of the joint pin is supported and guided against the wall of the bore 14.

In the uncoupled position, the jacket wall of the joint pin head 15 assumes support and guidance within the bore 14 of the right-hand side longitudinal wall 9 and the jacket wall sections 16 'support and guidance on the bore wall of the other side. This ensures that the hinge pin 4 is tilt-proof in any position.

The handling of the pliers is as follows:
To cancel the mouth width previously used, it is only necessary to move the hinge pin 4 axially from the side having the hinge pin head 15, that is to say transversely to the plane of movement of the pliers legs 2, 3 against spring action. Here, the pivot pin head 15 is received by the recess 22 and with the impact of the pivot pin head 15 on the profiled longitudinal slot flanks 12 (the upper end face) of the longitudinal slot 11, the positive engagement between the teeth 21 of the pivot pin 4 and the tooth spaces 13 of the longitudinal slot 11 is canceled. The hinge pin 4 can now be moved together with the pliers limb 3 displacing it in the direction of extension of the longitudinal slot 11. By releasing the joint bolt head 15, the spring 23 brings about the desired positive engagement of the profiles, the pivot pin collar 18 serves as a stop on the longitudinal slot flanks 12.

Another embodiment of the hinge pin is illustrated with reference to FIGS. 8 to 11. Insofar as the same parts are not explained separately, reference is made to the above statements.

The recess 22 or more precisely its smallest diameter d (in the case of a circular design, as in the exemplary embodiment), which smallest diameter likewise represents the free diameter, is selected such that when the hinge pin 4 is depressed, a viewing gap s (see also FIG. 9) on the profiled longitudinal slot flanks 12 remains. As can be seen in particular from the top view according to FIG. 8, dirt particles located below the protruding area U of the button part 27 and the end face 28 of the longitudinal slot flank 12 can be pushed into the intermediate spaces 29 or thrown upwards.

As can also be seen in particular from FIG. 8, the button part 27 covers a tooth of the longitudinal slot flanks 12 approximately half the tooth depth in the projection in the region of its largest diameter d 1.

In the embodiment of FIGS. 8 to 11, the articulated bolt head 15 consists in its base area of the superimposition of a rounded and a rectangular area. The rounded surface is formed by the separate button part 27. The overlay is further such that the width of the rectangle approximately corresponds to the free distance y between the longitudinal slot flanks 12, but the longitudinal extent exceeds the diameter d1 of the button part 27.

In addition, the narrow sides 30, 31 of the joint pin head 15 are rounded. The rounding corresponds to the inner free rounding of the recess 22.

The recess 22 is composed in detail of a cone section 32, which has an angle of inclination of approximately 30 °, and a cylindrical section 33.

As can be seen in particular from FIGS. 10 and 11 (in which the hinge pin 4 is shown without the button part 27 in FIG. 11), the narrow sides 30, 31 are raised such that they are in any case in the edge region in profile, i.e. in terms of height, exceed the adjoining edge region 34 of the button part 27, protrusion U 1. The button part 27 is arranged sunk in the hinge pin 4 with respect to the narrow sides 30, 31. In the depressed position which is also shown in FIG. 10, it is clear that this projection U 1 prevents the hinge pin 15 or an edge region 34 of the button part 27 from being pushed under the bore 14 of the pliers leg 9 when it is moved.

Moreover, with regard to the embodiment according to FIGS. 9 to 11, the intermediate section Z between the positive cross-sectional area (teeth 21) and the joint pin head 15 with a constant cross section even continues in the area of the button part 27 and at least partially projects beyond it, namely to the Narrow sides 30 and 31.

A modification is shown in FIG. 12 with regard to the recess 22 which surrounds the button part 27. The recess 22 is designed so that an elliptical edge line 35 results. However, the ellipse is irregular insofar as the focal points are generated by circles of different sizes and the ellipse in the lower area here resembles a parabola, in the upper area essentially an exact semicircle. In the upper area of the ellipse, the button part 27 is arranged concentrically with a focal point or a center point of the semicircle line 35 a.

The boundary line 35 is also not pronounced in the area of the strongest curvature of the parabola, due to a penetration with an elongated hole 36 in the pliers leg 3.

Overall, however, there is an ergonomically very advantageous design of the recess surrounding the button part 27. There is also a lower tendency with regard to dirt or the like which may become lodged. This recess can advantageously be made by forging.

The recess 37 of the embodiment of the pliers 1 shown in FIG. 15 is of exactly circular design, the center point AM being arranged eccentrically to the center point GM of the hinge pin 4. Here, too, there is an ergonomically very advantageous design of the recess 37, since the latter offers an optimal support for the underside of the thumb when the pivot pin 4 is displaced. It is also conceivable to design the recess 37 in an elliptical shape (similar to the recess shown in FIG. 12), the upper region of the ellipse being arranged concentrically to the center point GM of the hinge pin 4.

In the exemplary embodiment shown in FIGS. 16 and 17, the joint pin head 38 is designed as a round button part 39 which is spherically curved upwards. As can be seen in particular from FIG. 17, here too the recess 22 is composed of a conical section 32 and a cylindrical section 33. Moreover, in this embodiment, the articulation pin head 38 in the depressed state essentially completely fills the cylindrical section 33 of the recess 22 in its projection.

A modification is shown in FIGS. 18 and 19 with regard to the design of the joint pin head 40 and the recess 22 which surrounds the joint pin 4. As in the previous exemplary embodiments, the recess 22 has a cone section 32 and a cylindrical section 33, but the cone section 32 has an inclination angle of approximately 60 °. The joint pin head 40 is designed as a head part 41 structured on the upper side. This structuring is composed of a plurality of circular sections arranged concentrically and offset in height from one another, so that a step pyramid-shaped surface of the head part 41 is formed. This design of the head part 41 serves primarily for the safe handling of the pliers 1 when the jaw width changes. Slipping of the thumb with a dirty joint pin head 40 is thus successfully counteracted.

In the embodiments shown in FIGS. 15-19, the profiled flanks 12 form a limit stop for the joint pin 4 to be actuated, which is supported with the underside of the joint pin head 38 or 40 on the longitudinal slot flanks 12 mentioned.

In FIGS. 20 and 21, however, an embodiment is shown in which the hinge pin 4 has none of the hinge pin heads mentioned. Here, the displacement of the hinge pin 4 is limited only by the limited indentation of the actuating thumb. Here too, the longitudinal slot flanks 12 serve as limit stops, with the thumb underside corresponding to the underside of an articulated bolt head.

The hinge pins 4 mentioned in the previously mentioned exemplary embodiments are all loaded from the side opposite the hinge pin head by means of the spring 23 in the direction of the basic position.

The exemplary embodiments in FIGS. 22-24 show an alternative to this. Here, the hinge pin 4 can be fixed by means of a latching part 42 acting perpendicular to the direction of displacement of the hinge pin 4. This locking part 42 is composed essentially of a compression spring 43 and a locking ball 44.

The compression spring 43 is in this case mounted in the longitudinal leg wall 9 opposite the recess 22 in a blind bore 45 which is open in the direction of the bore 14 and loads the ball 44 in the direction of the cylindrical end section of the pivot pin 4. The pivot pin 4 is in this area with a corresponding Provide recess 46 for entry of ball 44 in the basic position.

The basic position of the hinge pin 4 is thus clearly defined. An unintentional release of the positive connection between the teeth 21 of the hinge pin 4 and the profiled longitudinal slot flanks 12 is hereby successfully counteracted. To adjust the width of the pliers jaw, the hinge pin 4 is axially displaced from the side having the hinge pin head 38, the latching ball 44 disengaging from the recess 46 (cf. FIG. 24). In this exemplary embodiment, the pivot pin 4 is moved back into the basic position manually by means of thumb actuation. Here, the hinge pin 4 is moved back until the locking part 42 fixes the hinge pin 4.

Claims (28)

1. Pincers (1) with two pincer arms (2, 3) which are interconnected by means of a hinge pin (4) having an actuating end in the form of a hinge pin head, the pincer mouth (M) being formed above the intersection area, and grip sections (7, 8) being formed beneath the intersection area on the pincer arms (2, 3), one pincer arm (2), movable in stages in order to alter the size of the pincer mouth (M) in the intersection area relative to the other pincer arm (3), passing through a free space (F) of the other pincer arm (3), the hinge pin (4) further being guided with a close fit in a bore (14) of the other pincer arm (3) and being displaceable transversely to the longitudinal plane of the pincers, and having two cross-sectional areas adjacent in the axial direction of the hinge pin (4) of which one, in the coupled condition, comes into positive engagement with the profiled edges of a longitudinal slot (11) lying in the intersection area of one pincer arm (2), and the other cross-sectional area being freely movable in the longitudinal slot (11), characterised in that the other pincer arm (3) is formed on the actuating side of the hinge pin (4) with a recess (22) in such a way that the recess (22) serves as a support for the underside of a thumb during actuation, the actuating end of the hinge pin being taken up in the recess (22) upon actuation by means of the depth of inward pressure of the thumb.
2. Pincers according to claim 1, characterised in that an actuating stop (countersunk in terms of depth), is provided for the hinge pin head (15, 38, 40).
3. Pincers according to claim 2, characterised in that the profile sides form the stop.
4. Pincers according to one of the preceding claims, characterised by spring loading on the hinge pin (4) from the side lying opposite the hinge pin head (15, 38, 40).
5. Pincers according to one of the preceding claims, characterised in that the hinge pin (4) may be adjustably secured by means of an engagement part (42) acting substantially perpendicularly to its direction of displacement.
6. Pincers according to claim 5, characterised in that the engagement part (42) is a spring-loaded ball (44).
7. Pincers according to one of the preceding claims, wherein the hinge pin has a cross-sectional area generating positive engagement, and a thinner intermediate section, characterised in that the intermediate section fills the area between the cross-sectional area generating the positive connection and the hinge pin head (15) with a constant cross-section.
8. Pincers according to one of the preceding claims, characterised in that the hinge pin head (15) is formed substantially to coincide in circumference with a circular envelope surface of the hinge pin (4).
9. Pincers according to one of the preceding claims, characterised in that the recess (22) is funnel-shaped.
10. Pincers according to one of the preceding claims, characterised in that the recess (22) is eccentric to the hinge pin head (15, 38, 40).
11. Pincers according to one of the preceding claims, characterised in that the recess (22) is roughly the size of a thumb.
12. Pincers according to one of the preceding claims, characterised in that the hinge pin head (40) is structured on the upper side.
13. Pincers according to one of the preceding claims, characterised in that the hinge pin head (38) is in the form of a round, upwardly spherically curved button part (39).
14. Pincers according to one of the preceding claims, characterised in that the hinge pin head (38, 40) when in the depressed condition, substantially entirely fills the opening in the recess (22).
15. Pincers according to one of the preceding claims, characterised in that a narrowest diameter of the recess (22) exceeds the diameter of the hinge pin head (15).
16. Pincers according to one of the preceding claims, characterised in that the hinge pin head (15) is separately formed.
17. Pincers according to one of the preceding claims, characterised in that the hinge pin head (15) is connected in the manner of a mortice and tenon to a basic part (16) of the hinge pin in order to form the hinge pin (4).
18. Pincers according to one of the preceding claims, characterised in that the recess (22) is formed with such a free diameter (d), or the hinge pin head (15) is formed with such dimensions relative to the free diameter (d) of the recess (22) that, even when the hinge pin (4) is depressed, a gap (s) allowing observation of the profiled sides (12) of the longitudinal slot of one pincer arm (2) remains.
19. Pincers according to one of the preceding claims, characterised in that the hinge pin head (15) covers a tooth of the sides (12) of the longitudinal slot of one pincer arm (2) to about half a tooth depth in a projection in the region of its greatest diameter relative to the sides (12) of the longitudinal slot.
20. Pincers according to one of the preceding claims, characterised in that the hinge pin head (15) is formed in its basic surface from the superimposition of a rounded and a rectangular surface, in such a way that the width of the rectangle roughly corresponds to the free distance (y) between the sides (12) of the longitudinal slot, yet its longitudinal extension exceeds the diameter (d1) of the rounded surface.
21. Pincers according to claim 20, characterised in that the narrow sides (30, 31) of the rectangular surface are rounded.
22. Pincers according to claim 21, characterised in that the radius of the circumferential line of the narrow sides (30, 31) roughly corresponds to the radius of the recess (22) in its narrowest diameter (d).
23. Pincers according to one of claims 19 to 22, characterised in that a projecting portion (U1) of the rectangular surface projects over the circular surface in profile (in height) of the adjacent circular section (34) of the hinge pin head (15).
24. Pincers according to one of claims 20 to 23, characterised in that the circular section is formed by a button part (27) counter-sunk in the hinge pin head (15).
25. Pincers according to one of the preceding claims, characterised in that the recess (22) is so formed that an ellipsoidal lateral line (35) results, the button part (27) being located concentrically with a focal point (P).
26. Pincers according to claim 25, characterised in that the lateral line (35) is composed of a semi-circular arc (35a) and a parabola (35b), the curvature in a lower turning point of the parabola (35b) being more intense than the curvature of the semi-circular arc (35a).
27. Pincers according to one of claims 25 or 26, characterised in that the button part (27) is located concentrically with the centre point of the semi-circular arc (35a).
28. Pincers according to one of claims 25 to 27, characterised in that the lateral line (35) of the recess (22) is not formed in the region of the most intense parabola curvature, due to the fact that the recess (22) is penetrated by a slot-like longitudinal recess (36) in the pincer arm (3).

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