Pliers

Abstract

A pair of pliers having two pliers legs that are arranged in a crossing manner, wherein a fixed joint is formed, having a joint pin. The joint pin has a first conical portion that widens towards the outer side, wherein, the pliers leg is assigned a second conical portion which bears on the first conical portion and transitions into a first mouth portion that leads into the outer side of the pliers leg. The joint pin has a second mouth portion which, starting from the outer side of the pliers leg and perpendicularly to a joint axis, overlaps the first mouth portion. The first and second mouth portion, bound a circular clearance between one another, the radial dimension of the clearance corresponding to 0.05 to 0.15 times the radial dimension, measured from the joint axis of the joint pin in the region of the second mouth portion.

Claims

1. A pair of pliers (1) with two pliers legs (2, 3) that are arranged in a crossing manner, wherein a fixed joint with a joint pin (8) is formed, wherein the joint pin (8) has a first conical portion (19), which is assigned to an outer side (18) of a pliers leg (2, 3) and widens toward the outer side (18), and wherein the pliers leg (2, 3) is furthermore assigned a second conical portion (21), which bears on the first conical portion (19) and transforms into a first mouth portion (22) leading into the outer side (18) of the pliers leg (2, 3), wherein the joint pin (8) has a second mouth portion (20) that overlaps the first mouth portion (22) starting from the outer side (18) of the pliers leg (2, 3) and perpendicular to a joint axis (x), wherein the first and the second mouth portion (22, 20) bound a toroidal clearance (23) between one another in a radially encircling manner, and wherein the radial dimension (a) of said clearance corresponds to 0.05-times to 0.15-times the radial dimension (b) of the joint pin (8) in the region of the second mouth portion (20), which is measured starting from the joint axis (x).

2. The pair of pliers according to claim 1, wherein the first and/or second mouth portion (20, 22) includes an acute angle with the joint axis (x) in a cross section.

3. The pair of pliers according to claim 1, wherein a length (d) of the second mouth portion (20) measured in the direction of the joint axis (x) is greater than a length (c) of the first mouth portion (22) measured in the direction of the joint axis (x).

4. The pair of pliers according to claim 1, wherein the second mouth portion (20) is designed for lying radially opposite of a partial region of the second conical portion (21) over part of its axial length (d).

5. The pair of pliers according to claim 1, wherein the axial length (d) of the second mouth portion (20) corresponds to 0.1-times to 0.3-times the radial dimension (b) of the joint pin (8) in the region of the second mouth portion (20), which is measured starting from the joint axis (x) and/or wherein the axial length (c) of the first mouth portion (22) preferably corresponds to 0.05-times to 0.15-times the radial dimension (b) of the joint pin (8) in the region of the second mouth portion (20), which is measured starting from the joint axis (x).

6. The pair of pliers according to claim 1, wherein both mouth portions (20, 22) transform into the same outer side (18) of the assigned pliers leg (2, 3) or the joint pin (8), which extends perpendicular to the joint axis (x).

7. The pair of pliers according to claim 1, wherein the pair of pliers (1) furthermore has a symmetry axis (y), which extends through the joint axis (x) and on which work regions (9, 10) of the pliers legs (2, 3) can be moved toward one another.

8. The pair of pliers according to claim 1, wherein a first ring wall portion (24) is provided on the symmetry axis (y) and assigned to the work regions (9, 10), wherein the first ring wall portion at least partially surrounds the joint pin (8), and wherein this first ring wall portion has a thickness (h) that corresponds to between half and one third of the radial dimension (b) of the joint pin (8) in the region of the second mouth portion (20).

9. The pair of pliers according to claim 1, wherein a second ring wall portion (25), which lies opposite of the first ring wall portion (24) in the direction of the symmetry axis (y), has a thickness (k) that approximately corresponds to the diameter of the joint pin (8) in the region of the second mouth portion (20).

10. A pair of pliers, comprising one or more of the characterizing features of claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is described in greater detail below with reference to the attached drawings that merely show exemplary embodiments. A component, which is only described with reference to one of the exemplary embodiments and in another embodiment not replaced with a different component due to its specific characteristics, is therefore also described as a potentially existing component for this other exemplary embodiment. In the drawings:

(2) FIG. 1 shows the front view of a pair of pliers concerning a first embodiment;

(3) FIG. 2 shows a corresponding side view;

(4) FIG. 3 shows the opposite side view;

(5) FIG. 4 shows a rear view of the pair of pliers;

(6) FIG. 5 shows a top view of the pair of pliers;

(7) FIG. 6 shows a bottom view of the pair of pliers;

(8) FIG. 7 shows a perspective representation of the pair of pliers;

(9) FIG. 8 shows the enlarged detail of the region VIII in FIG. 1;

(10) FIG. 9 shows a section along the line IX-IX in FIG. 8;

(11) FIG. 9a shows the enlarged detail of the region IXa in FIG. 9;

(12) FIG. 10 shows a partial section along the line X-X in FIG. 8; and

(13) FIG. 11 shows a representation that corresponds to FIG. 8 and concerns a second embodiment of the pair of pliers.

DESCRIPTION OF THE EMBODIMENTS

(14) A pair of pliers 1 is initially described with reference to FIG. 1. In the first embodiment illustrated in FIGS. 1-10, this pair of pliers is realized in the form of side cutting nippers. However, the embodiments described below not only concern such side cutting nippers, but rather all possible types of pliers with a fixed joint pin and therefore also a pair of pliers 1 in the form of universal pliers according to the illustration in FIG. 11.

(15) The pair of pliers 1 comprises two pliers legs 2, 3 that are arranged in a crossing manner. In this case, each pliers leg 2, 3 forms a handle leg 4, 5 that transforms into a pliers jaw 6, 7 beyond the crossing region of the pliers legs 2, 3.

(16) The handle leg 4 and the pliers jaw 6 form the pliers leg 2; the handle leg 5 and the pliers jaw 7 form the pliers leg 3.

(17) In the exemplary embodiment shown, the joint (single joint) of the pair of pliers 1 is realized in the form of a lap joint, wherein the pliers legs 2, 3 have material notches in the crossing region, and wherein portions of the other pliers leg lie in said notched regions.

(18) The fixed joint furthermore comprises a joint pin 8. This joint pin penetrates the pliers legs 2, 3 in the transition region from the respective handle leg into the pliers jaw.

(19) A geometric joint axis x simultaneously forms the body axis of the joint pin 8 and extends perpendicular to a plane, in which the pliers legs 2, 3 move during an actuation of the pair of pliers 1.

(20) The joint pin 8 is preferably a solid bolt rivet.

(21) The pair of pliers 1 is furthermore realized largely symmetrical referred to a symmetry axis y, which extends through the joint axis x and on which work regions 9, 10 of the pliers legs 2, 3 can be moved toward one another. In the first exemplary embodiment of the pair of pliers 1 in the form of side cutting nippers, these work regions 9, 10 are realized in the form of cutting edges. If the pair of pliers 1 is realized in the form of universal pliers according to the illustration in FIG. 11, different work regions 9, 10 such as a cutting region, a gripping region and a terminal flat pliers region are adjacently arranged in a row along the symmetry axis y.

(22) In the closed position of the pliers mouth according to the illustrations in FIGS. 1 and 11, work regions 9, 10 in the form of cutting edges or flat jaws meet one another on the symmetry axis y.

(23) In the crossing region of the pair of pliers, the joint pin 8 penetrates each pliers leg 2 in the region of a joint lug 11, 12 formed at this location.

(24) The joint pin 8 is preferably realized in the form of an insertion rivet that is inserted through the joint lugs 11, 12 of the pliers legs 2, 3 in the direction of the joint axis x from one side, wherein a first end region of the rivet viewed in the inserting direction is then correspondingly deformed, for example by means of wobble riveting.

(25) To this end, the bolt rivet essentially consists of a head part 13 and a shaft part 14. The head part 13 is accommodated in an essentially form-fitting manner in the associated joint lug 11 in the pliers leg 2 whereas the shaft part 14 extends through both pliers legs 2 and 3 in the region of the respective single joint or joint. The shaft part 14 is for the intended riveting process realized so long that a shaft portion protruding from the pliers legs 2 and 3 to be riveted to one another can be formed into a rivet depression 15 toward the head part.

(26) The drawings respectively show a pair of pliers 1 with a joint pin 8 after the completion of the riveting process.

(27) The head part 13 comprises a central blind bore 17 that leads into the bolt face 16 extending transversely to the joint axis x, particularly for the purpose of a convenient adjustment. This blind bore extends in the direction of the joint axis x over approximately half the axial dimension of the head part 13.

(28) The following explanations with respect to the design of the joint pin portion and the associated joint lug refer to the head part 13 of the joint pin 8 and the joint lug 11 in the pliers leg 2. However, this described design may alternatively or additionally also be realized in the region of the opposite end of the joint pin 8 in connection with the joint lug 12 in the pliers leg 3.

(29) The joint pin 8 has a first conical portion 19, which is assigned to the outer side 18 of the pliers leg 2 extending transversely to the joint axis x and widens toward the outer side 18, wherein said first conical portion starts at the shaft part 14 and therefore essentially defines the head part 13. This first conical portion 19 of the joint pin 8 transforms into a terminal second mouth portion 20, the bolt face 16 of which preferably extends in the plane defined by the outer side 18 of the pliers leg 2.

(30) The joint lug 11 formed in the pliers leg 2 has a cylindrical portion, which faces the other pliers leg 3 and on which the outer wall of the shaft part 14 is supported. This cylindrical region transforms into a second conical portion 21 in the direction of the outer side 18, wherein the end of said second conical portion leads into a first mouth portion 22. This first mouth portion 22 transforms into the outer side 18 of the pliers leg 2.

(31) The first conical portion 19 of the joint pin 18 bears on the second conical portion 21.

(32) The enlarged detail in FIG. 9a particularly shows that a circular-cylindrical design referred to the joint axis x can be realized with respect to the mouth portions 20, 22. The encircling walls of both mouth portions 20, 22 extend parallel to the joint axis x in the cross section according to FIG. 9a.

(33) Alternatively, the wall of the mouth portion 20 and/or 22 may starting from the conical portion 19, 21 include an acute angle, for example, of up to 15 degrees with the joint axis x (see dotdashed wall configuration in FIG. 9a), wherein the wall may with respect to the wall configuration of the second and/or first mouth portion 20, 22 be inclined radially inward or radially outward starting from the conical portion 19, 21.

(34) The encircling surface area of the second mouth portion 20 on the pin side is spaced apart from the encircling inner surface area of the first mouth portion 22 on the leg side radially inward referred to the joint axis x. In this way, a toroidal clearance 23 encircling the joint axis x is formed, wherein said toroidal clearance is with respect to a cross section according to the illustration in FIG. 10 essentially closed on three sides and only opens toward the outer side 18.

(35) The clearance 23 has a maximum radial dimension a, which is preferably measured in the plane of the outer side 18 and corresponds to 0.05-times to 0.15-times the radial dimension b of the joint pin 8 in the region of the second mouth portion 20, which is measured starting from the joint axis x. In the exemplary embodiment shown, the radial dimension a of the clearance 23 approximately corresponds to 0.085-times the radial dimension b in the region of the second mouth portion 20.

(36) This furthermore means that, viewed in the direction of the joint axis x, the axial length of the second mouth portion 20 on the joint pin side is greater than the axial length of the first mouth portion 22 in the pliers leg 2 viewed in the same direction. In the exemplary embodiment according to the illustration in FIG. 10, the length c of the first mouth portion 22 on the leg side approximately corresponds to 0.4-times to 0.5-times the length d of the second mouth portion 20 on the pin side.

(37) The length c of the first mouth portion 22 on the leg side may also correspond to 0.9-times to 1.1-times and furthermore to approximately 1-times the radial dimension a of the clearance 23.

(38) Due to the above-described dimensions, a line encircling the joint axis x is formed in the transition region from the first conical portion 19 into the second mouth portion 20 of the joint pin 8, wherein said transition line radially overlaps the conical surface of the second conical portion 21 on the leg side. The second conical portion 21 extends beyond this transition line in the direction of the outer side 18 and ultimately transforms into the first mouth portion 22.

(39) Accordingly, the clearance 23 furthermore has a cross-sectional design, in which a region with a constant radial dimension a is formed over the axial height of the first mouth portion 22 starting from the outer side 18 and transforms into a portion that is continuously tapered radially and axially inward. An encircling, inwardly directed interstice region of the clearance 23 is thereby formed.

(40) The radial dimension b of the second mouth portion 20 on the pin side can preferably correspond to 1.2-times to 1.8-times and furthermore to approximately 1.5-times the radial dimension e in the region of the shaft part 14 as shown.

(41) A resulting axial dimension f of the first conical portion 19 of the joint pin 8 may approximately correspond to 0.6-times to 0.8-times and furthermore to approximately 0.7-times the axial dimension g of the entire head part 13, which is composed of the first conical portion 19 and the second mouth portion 20.

(42) Ring wall regions encircling the joint pin 8 are formed in the pliers legs. A first ring wall portion 24 is assigned to the work regions 9 and 10 and with respect to a cross section according to the illustration in FIG. 9 extends between the toroidal clearance 23 and the respective work regions 9 and 10.

(43) In the exemplary embodiment shown, a thickness h measured radially to the joint axis x and along the symmetry axis y approximately corresponds to 0.5-times the radial dimension b of the second mouth portion 20 on the pin side.

(44) The second ring wall portion 25 between the clearance 23 and the attachment regions of the handle legs 4 and 5, which lies opposite of the first ring wall portion 24 in the direction of the symmetry axis y, has a corresponding thickness k that approximately corresponds to 1.5-times the radial pin dimension b in the region of the second mouth portion 20.

(45) The joint pin 8 is therefore shifted from the geometric center of the crossing region of the pliers legs 2 and 3 in the direction of the work regions 9, 10 along the symmetry axis y by approximately the radial dimension e in the region of the shaft part 14. In this way, an advantageous force transmission to the work regions 9 and 10 is achieved when the pair of pliers 1 is actuated, namely without affecting the joint pin-joint stability.

(46) The preceding explanations serve for elucidating all inventions that are included in this application and respectively enhance the prior art independently with at least the following combinations of characteristics, namely:

(47) A pair of pliers, which is characterized in that the joint pin 8 has a second mouth portion 20 that overlaps the first mouth portion 22 starting from the outer side 18 of the pliers leg 2, 3 and perpendicular to a joint axis x, wherein the first and the second mouth portion 22, 20 bound a toroidal clearance 23 between one another in a radially encircling manner, and wherein the radial dimension a of said clearance corresponds to 0.05-times to 0.15-times the radial dimension b of the joint pin 8 in the region of the second mouth portion 20, which is measured starting from the joint axis x.

(48) A pair of pliers, which is characterized in that the first and/or second mouth portion 20, 22 includes an acute angle with the joint axis x in a cross section.

(49) A pair of pliers, which is characterized in that a length d of the second mouth portion 20 measured in the direction of the joint axis x is greater than a length c of the first mouth portion 22 measured in the direction of the joint axis x.

(50) A pair of pliers, which is characterized in that the second mouth portion 20 is designed for lying radially opposite of a partial region of the second conical portion 21 over part of its axial length d.

(51) A pair of pliers, which is characterized in that the axial length d of the second mouth portion 20 corresponds to 0.1-times to 0.3-times the radial dimension b of the joint pin 8 in the region of the second mouth portion 20, which is measured starting from the joint axis x.

(52) A pair of pliers, which is characterized in that the axial length c of the first mouth portion 22 corresponds to 0.05-times to 0.15-times the radial dimension b of the joint pin 8 in the region of the second mouth portion 20, which is measured starting from the joint axis x.

(53) A pair of pliers, which is characterized in that both mouth portions 20, 22 transform into the same outer side 18 of the assigned pliers leg 2, 3 or the joint pin 8, which extends perpendicular to the joint axis x.

(54) A pair of pliers, which is characterized in that the pair of pliers 1 furthermore has a symmetry axis y, which extends through the joint axis x and on which work regions 9, 10 of the pliers legs 2, 3 can be moved toward one another.

(55) A pair of pliers, which is characterized in that a first ring wall portion 24 is provided on the symmetry axis y and assigned to the work regions 9, 10, wherein the first ring wall portion at least partially surrounds the joint pin 8, and wherein this first ring wall portion has a thickness h that corresponds to between half and one third of the radial dimension b of the joint pin 8 in the region of the second mouth portion 20.

(56) A pair of pliers, which is characterized in that a second ring wall portion 25, which lies opposite of the first ring wall portion 24 in the direction of the symmetry axis y, has a thickness k that approximately corresponds to the diameter of the joint pin 8 in the region of the second mouth portion 20.

(57) All disclosed characteristics are essential to the invention (individually, but also in combination with one another). The disclosure content of the associated/attached priority documents (copy of the priority application) is hereby fully incorporated into the disclosure of this application, namely also for the purpose of integrating characteristics of these documents into claims of the present application. The characteristic features of the dependent claims characterize independent inventive enhancements of the prior art, particularly for submitting divisional applications on the basis of these claims.

LIST OF REFERENCE SYMBOLS

(58) 1 Pair of pliers 2 Pliers leg 3 Pliers leg 4 Handle leg 5 Handle leg 6 Pliers jaw 7 Pliers jaw 8 Joint pin 9 Work region 10 Work region 11 Joint lug 12 Joint lug 13 Head part 14 Shaft part 15 Rivet depression 16 Bolt face 17 Blind bore 18 Outer side 19 First conical portion 20 Second mouth portion 21 Second conical portion 22 First mouth portion 23 Clearance 24 First ring wall portion 25 Second ring wall portion a Radial dimension b Radial dimension c Length d Length e Radial dimension f Axial dimension g Axial dimension h Thickness k Thickness x Joint axis y Symmetry axis