DE7525115U - PLIERS SHAPED HAND TOOLS IN PARTICULAR PLIERS SCHNEIDER SCISSORS O.DGL. - Google Patents

Description

0-7300 Ess lift device * * Dipl.-Ing. Hartmut Kehl / Throat Mülbergerstrasse 65 Dipl.-Ing. Volkhard Kratzsch Scratch Telephone Stuttgart 0711 - 35 99 92 Deutsche Bank Esslingen 210906 cable «kehlpatent» esslingenneckar Post office at F.Ljttgart 10004-701 Chase Manhattan Bank New York

Werner Möller KG August 5, 1975

5630 Remscheid 1 lawyers file 1954

Pliers-shaped hand tools, in particular pliers, tailors, scissors or the like.

The invention relates to a forceps-shaped hand tool, in particular Pliers, tailors, scissors or the like, the two of which are intended for handling, preferably outwardly curved handle legs, in each case essentially over its entire length from the free end of the handle to approximately the Swivel joint are encased by an insulated handle. The term pliers-shaped hand tool includes all types of conventional technology Pliers, e.g. combination pliers, flat nose pliers, round nose pliers, flat nose pliers, nippers, cable pliers, scissors pliers, adjustment and precision mechanics « pliers, collet pliers, as well as all kinds of other special pliers, also all common types of hand cutting tools, e.g. side cutters, end cutters, bolt cutters, cable cutters, etc., and also all types of Scissors, e.g. wire rope cutters, tin snips, tin nibblers, etc.

There are hand tools of this type known in which the handle legs with Insulating handles made of plastic are coated. In the choice and design of these insulating handles or covers, it was primarily assumed that

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Insulated handles should only have the purpose when used as intended of the hand tools the touch of the palm of the hand with the bare metallic ones Turn off grip legs and electrical insulation against low voltages to reach 220 volts. For cost reasons, the insulating sleeves or handles were therefore usually made as cheap and simple as possible, provided that they only fulfilled the aforementioned purpose. Ergonomic considerations, in particular of a physiological and psychological nature, were not taken into account here. Known hand tools thus carry such ergonomic and application-related aspects are not taken into account. Hence these hand tools are often difficult to hold and do not allow sensitive and sensitive handling. For operation, especially when Cutting of metal parts, e.g. of steel wires / or also for loosening very tight parts, e.g. nuts, where over the palm of the hand on the handle legs Relatively large physical forces have to be applied, therefore large forces are necessary and yet only little force development of the hand tool achievable by yourself. Heavy strain, sometimes excessive strain on the human forearm muscles, high pressure on the palm of the hand and thus rapid fatigue, risk of palm injuries and thus work and The consequences are discomfort and reluctance to perform.

The invention is based on the object of a pliers-shaped hand tool To create a defined genus, with regard to the design of the handle legs ergonomic and application-related aspects in the foreground stand and as a result of this design of the handle legs and / or their insulating handles or envelopes is achieved that the hand tool is good, easy and safe, and also slip-proof, lies in the hand, sensitively, especially with reduced physical exertion and physical strain, can be handled and a good, reliable tool guidance and force development is made possible without the risk of injury.

In the case of a pliers-shaped hand tool, the task is the one mentioned at the beginning Type solved according to the invention in that the insulating handle in cross section, Seen transversely to the longitudinal extension of the handle, essentially a quadrangular shape rounded to the longitudinal outer surface with essentially parallel to the direction of the Joint axis running, flat, longitudinal inner surface not curved in this direction, at right angles to the direction of the joint axis, flat wide outer surfaces on the top and bottom and with convex outwardly curved, with a curved transition to the wide outer surface on the upper and Has the underside adjoining longitudinal outer surface, the convex curvature of the longitudinal outer surface being weaker than that of the arcuate transition, and that the insulating handle merges into a massive thickened head on the section facing the swivel joint, the longitudinal inner surface of which when the head is closed The tool runs approximately parallel to the longitudinal plane of symmetry crossing the joint axis and is also designed to be flat and not curved Wide outer surfaces on the top and bottom are flat and are essentially at right angles to the direction of the joint axis and its transverse to the Wide outer surfaces extending outer narrow surface essentially in the same way is curved on the outside, like the longitudinal outer surface of the remaining part of the insulated handle, the contour of the outer narrow surface of the head / inside seen the plane of the broad outer surfaces, is composed on the one hand of an end of the longitudinal inner surface pointing from the free end of the longitudinal inner surface facing the pivot joint of the head outwardly with a large radius, the center of which is preferably on the symmetrical line when the tool is closed, the curved first arcuate section, which is slightly curved in the direction of the opposite free end of the handle leg falls and ends in an acute-angled corner, and on the other hand from a second arc section extending from the corner, the concave and towards the symmetry with a smaller curvature than the first arcuate section is curved and into the longitudinal outer surface of the rest of the insulating handle part transforms. It goes without saying that instead of the inventive design of the insulating

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handle the corresponding design of the handle legs themselves the same advantages » parts opened.

This design according to the invention improves the handling of the pliers-shaped hand tool in many ways. Ergonomic and application aspects is taken into account to a large extent, as well as the shape of the human hand and fingers as well the force and movement sequence when handling the handicraft tool by the human hand. As a result of the design of the handle, the hand tool according to the invention lies much better in the hand, like comparative experiments have clearly shown with known hand tools. Furthermore, the hand tool is more sensitive and therefore safer to use. The danger that one Slipping off the thighs or the risk of injuring the palm of the hand during handling are almost completely eliminated. This essentially contributes the individual design features, in particular the shape of the radii and curvatures. When used as intended, there is, in particular In the case of cutting pliers as hand tools or also in pliers that are used to loosen stuck parts, e.g. nuts or the like, an essential reduced effort. Nevertheless, the effective development of force on the pliers jaws or cutting edges is increased. The pressure on the human palm is significantly reduced, above all the human pressure Forearm muscles only used relatively little and even when cutting not overstressed by steel wires or loosening very tight parts, e.g. nuts or the like. The achieved relief of the muscles in association with The other advantages explained above mean that fatigue and tension occurring during use are essentially completely eliminated are. At the same time, the electrical insulation protection is optimized.

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It can be advantageous if the radius of the curvature of the first arcuate section is approximately twice that of the curvature of the second arcuate section. It can also be of advantage if it is on the head adjoining part of the Isofiergrlffes, within the plane of the wide outer surfaces seen, is slightly arched outwards and the longitudinal inner flute with over the longitudinal extent of the insulating handle runs at a constant distance in relation to the longitudinal outer surface. In addition, it can be provided in a further advantageous embodiment that the acute-angled corner of the massive Head of the insulated handle, seen within the wide outer surfaces, is not extends further outwards than the one that protrudes furthest outwards Surface section of the longitudinal outer surface, but preferably at the same level ends. This design makes handling safe and soulful Control of hand tools and safety against slipping even improved, and the physical stress of handling is reduced even further.

Another advantageous embodiment relates primarily to so-called Combination pliers, which should be universally applicable, because you have to be able to grip, pull and cut with them. According to the invention is for this Provided in an advantageous development that the thickness of the massive head and an adjoining Isoliergriffabschnittes, measured in the direction parallel to the hinge axis and from the top to the bottom of the Breitau ßenf pool, is less than the thickness of the measured in the same direction remaining insulating handle section. The arrangement can be made in such a way that that the leg length of the insulating handle portion of greater thickness is about two Third of the total length. The greater thickness to about two thirds of the total length of the handle leads to that a greater development of force when gripping the handle legs is achieved in this length range. In contrast, the smaller thickness of the handle legs approximately on the first third of the longitudinal extension allows a better Guide the pliers. Thus, according to the invention, by appropriate grip

design the combination purpose of such combination pliers optimal account carried.

In another advantageous embodiment it is provided that the wide outer surfaces on the top and bottom of the massive head run continuously in the same plane as the wide outer surfaces on the top and bottom of the insulating handle section adjoining the head, so that the entire insulating handle About one, has its entire longitudinal extension constant in the direction parallel to the hinge axis and from the top to the bottom of the wide outer surfaces measured _/ thickness. Here, the thickness of the handle legs is constant over the entire length.

In a further advantageous embodiment it is provided that the longitudinal inner surface of the insulated handle in the area of the free end of the handle leg one with surface roughness, preferably a corrugation, provided surface section. Included the corrugation can be successive in the longitudinal extension of the insulating handle Projections and depressions may be formed between the projections that are approximately parallel to each other and parallel to the Geicink axis in the direction of the thickness from the top to running continuously towards the underside and within the plane of the wide outer surfaces of the insulating handle. Through this surface roughness, in particular Corrugations, an additional skirting board is created, thus an additional one Protection against slipping of the hand from the grip legs. Also facilitate the corrugations allow the hand tool to be opened and directed by hand and give the hand an even greater and more secure hold.

In a further advantageous embodiment it is provided that the insulated handle is designed as a one-piece plastic part and preferably made of a polyvinyl chloride (PVC), which has a relatively low hardness, is cold-stabilized, break-proof and flame-retardant. The plastic material can have a Shore hardness of have about 76. The surface of the plastic material can be blunt and large-pored. The large-pored surface is at least partly due to the relative Due to the low hardness of the plastic material. Through this large-pored and blunted

The surface of the insulated handles is used to protect against slipping and slipping Hand or finger raised from the grip thighs; because on the one hand is the surface roughness and thus the grip of the handle legs on the other hand, the large-pored surface is hand-sweat-absorbent Character, so that this also reduces the risk of a damp hand slipping.

The invention is based on the embodiments shown in the drawings explained in more detail. Show it

Fig. 1 is a front view of combination pliers, as

first exemplary embodiment,

Fig. 2 is a side view of the combination pliers in Fig. 1,

3 shows a section of the handle legs of the combination pliers

along the line III-Ml in Fig. 1, Fig. 4 is a front view of a power side cutter, according to ^ ß

a second exemplary embodiment,

Fig. 5 is a side view of the power side cutter in Fig. 4,

6 shows a cross section of the handle legs of the power side cutter

along the line VI-VI in FIG. 4.

1-3 is a first exemplary embodiment of a pliers-shaped hand tool a combination pliers 10 shown in natural size. The pliers 10 has two Via a swivel joint 11 with a joint axis extending at right angles to the plane of the drawing 12 pivotally interconnected pliers legs 13 and 14. Each Pliers leg 13, 14 has at one end, at a distance from the swivel joint 11, a pincer jaw 15 or 16 and is on its other part of the swivel joint 11 facing away from the pincer jaw 15 or 16 as a handle leg 17 or 18 educated. The handle legs 17, 18 are intended for handling the pliers 10 and are essentially to the left and right outside in the drawing according to FIG curved. Essentially along its entire length from the free end of the handle arm 19 or 20 up to about the pivot joint 11 is each handle leg 17 or 18

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encased by an insulating handle 21 or 22 made of plastic.

The following is the special design of the insulating handles 21, 22, namely the Better overview because of the example of the handle leg 17, explained in more detail.

As can be seen in particular from FIGS. 1 and 3, the insulating handle 21 of the Handle give Is 17 in cross section, transverse to the longitudinal extension of the handle leg 17 seen, substantially to the longitudinal outer surface 23 rounded rectangular shape on. Longitudinal outer surface 23 is the outer surface of the insulated handle 21, which is in the representation according to FIG. 2 lies within the plane of the drawing. This quadrangular shape is determined on the one hand by a flat longitudinal inner surface 24 which runs essentially parallel to the direction of the joint axis 12 and is not curved in this direction (See in particular Fig. 3). On the other hand, the square shape is determined by on the top and bottom of the insulating handle 21 provided, at right angles to the direction of the hinge axis 12, flat wide outer surfaces 25, 26 (cf. in particular FIGS. 2 and 3), which are at right angles to the course of the longitudinal inner surface 24 are aligned. Finally, the quadrangular shape is delimited by the longitudinal outer surface 23, which, as FIG. 3 in particular shows, has a convex curvature 27 is curved on the outside and on both sides of the convex curvature 27 each with an arcuate transition 28, 29 to the broad outer surface 25 and 26 on the upper and base connects.

Fig. 3 shows that the convex curvature 27 of the longitudinal outer surface 23 is curved less than the curvature of the arcuate transitions 28 or 29. The radius the convex curvature 27 can be 15, for example, while that of the arcuate transitions 28, 29 can only be 5.

At the section facing the swivel joint 11, the insulating handle 21 goes over into a solid, thickened head 30. The insulating handle 22 has a corresponding thickened head 31 arranged in a mirror-inverted manner to the line of symmetry 32.

The thickened head 30 has a longitudinal inner surface 33, which when closed Pliers 10, as shown in Fig. 1-3, approximately parallel to the line of symmetry 32, which crosses the hinge axis 12, runs and which is also designed flat and uncurved. The wide outer surfaces 34, 35 of the head 30 (cf. in particular 2) are flat on the top and bottom, as are the wide outer surfaces 25, 26 of the insulating handle 21. Furthermore, the wide outer surfaces 34, 35 run essentially at right angles to the direction of the joint axis 12. The outer narrow surface 36 of the head 30, which runs transversely to the wide outer surfaces 34, 35, is in the essentially just as curved outward as the longitudinal outer surface 23 of the rest Part of the insulating handle 21 (see. Fig. 3). Thus, the outer narrow surface is also Convexly arched outwards and merges with arcuate transitions into the wide outer surfaces 34, 35.

Viewed within the plane of the wide outer surfaces 34, 35, that is to say within the plane of the drawing according to FIG. 1, the contour profile of the outer narrow surface 36 of the head is composed of a first arch section 37 and a second arch section 38. The first curved section 37 extends from the free one pointing to the swivel joint 11 The end of the longitudinal inner surface 33 of the head 30 is relatively large towards the outside Radius, e.g. of 34 mm, the center of which when the clamp 10 is closed according to Fig. preferably lies on the symmetry line 32, curved and falls slightly in the direction to the opposite, free handle leg end 19 and ends in an acute-angled corner 39, which can be slightly rounded.

The second arcuate section 38 starts from the corner 39, is concave and with a smaller curvature to the line of symmetry 32 than the first arcuate section 37, for example with a Radius of 18 mm, curved and goes into the longitudinal outer surface 23 of the remaining part of the insulated handle 21 continuously over.

The radius of curvature of the first arcuate section 37 (cf. FIG. 1) can therefore be approximately twice that of the curvature of the second arcuate section 38.

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In particular from Fig. 1 it can be seen that the head 30 adjoins Part of the insulating handle 21, -within the plane of the wide outer surfaces 25, 26 of this Insulating handle 21 seen, is slightly curved outward jund that the longitudinal inner surface 24 runs at a constant distance over the longitudinal extent of the insulating handle 21 in relation to the longitudinal outer surface 23. The insulating handle 21 has so on this length range up to approximately the beginning of the second curved section 38 uniform and constant width.

Furthermore, Fig. 1 shows that the acute-angled corner 39 of the massive head 30 of the Insulating handle 21, seen within the wide outer surfaces 25, 26, no further extends outward than the most outwardly protruding surface section 40 of the longitudinal outer surface 23. In the exemplary embodiment shown according to FIG the acute-angled corner 39 approximately at the level of one applied to the surface section 40 Touch tangent.

In the combination pliers 10 shown (see. In particular FIGS. 1 and 2) is the Thickness, measured in the direction parallel to the hinge axis 12 and from the top to the Underside of the wide outer surfaces 25, 26, the massive head 30, 31 and one adjoining section 41 of the insulating handle 21 less than that in the same Direction measured thickness of the remaining part of the insulated handle 21. In the projection As seen in FIG. 2, this aforementioned section 41 has a length dimension α in FIG. The projected length α of this section 41 is about 1/3 of the total leg length. In contrast, the handle leg is on the remaining 2/3 of the entire length extension provided with greater thickness measured from the broad outer surface 25 to the broad outer surface 26. The leg length of greater thickness of the insulating handle 21 is therefore about 2/3 of the total length.

In particular, FIG. 2 clearly shows that the wide outer surfaces 34, 35 of the head 30 parallel to one another and parallel to the wide outer surfaces 25, 26 of the remaining section of the insulating handle 21 run.

In the area of the free end of the handle leg 19 (see FIGS. 1 and 3), the longitudinal inner surface 24 of the insulating handle 21 has a rough surface in the form of a Corrugation 42 provided surface section 43 guf. The corrugation 42 is formed by projections and depressions following one another in the longitudinal extension of the insulating handle 21, which run approximately parallel to one another and parallel to the hinge axis 12 in the thickness direction from the top to the bottom and which end within the flat, wide outer surfaces 25, 26 of the insulating handle 21.

The insulating handle 21, 22 is designed as a one-piece plastic part. It consists preferably of a polyvinyl chloride (PVC), which has a relatively low hardness, is cold-stabilized, unbreakable and flame-retardant. The hardness of this plastic material, defined in Shore hardness, can be around 76. In addition, the plastic material has a blunt and large-pored surface. It is understood that, although the design of the handle legs 17, 18 above only has been described using the example of the insulating handle 21, the insulating handle 22 in the design completely corresponds to the insulating handle 21, is only arranged and designed as a mirror image of this. Due to the described design of the insulating handles 21, 22 a particularly good, sensitive and handy handling of the pliers 10 is achieved. Ergonomic and application-related aspects are taken into account to a large extent, including the shape of the human hand and fingers, as well as the force and movement sequence when handling the pliers 10. The pliers Due to the design of the handle, it is much better in the hand than known pliers, as comparative tests have shown. Furthermore, the pliers 10 are more sensitive and, at the same time, safer to handle. The risk of slipping off the handle legs 17, 18 or of injuring the palm of the hand is almost completely averted. When used as intended, especially when cutting sheet metal or wires / as well as when loosening particularly tight parts, e.g. nuts or the like, that the Pliers 10 can be handled with very little effort. Still that is effective power development on the jaws 15, 16 or on the cutting edges extremely large. The pressure acting on the human palm is significantly reduced, especially the human forearm muscles only become little stressed and not overstrained even when high effort is required. The achieved relief of the muscles in combination with the other advantages

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¹ leads to the fact that fatigue and tension occurring during use are essentially completely eliminated, at the same time the electrical insulation protection is optimized by the insulating handles 21 and 22.

The greater, measured in the direction parallel to the joint axis 12 thickness between the Wide outer surfaces 25, 26 of two thirds of the length of the handle leg leads to that when gripping the pliers 10 an extraordinarily large power delivery is achieved will. The comparatively smaller thickness of the section 41 with the longitudinal extension a, approximately on the first third of the total longitudinal extension, allows a better and more sensitive guidance of the pliers 10.

The corrugation 42 on the surface section 43 creates a slip protection, thus an additional safeguard against slipping the hand off the handle legs 17, 18. The corrugations 42 also make it easier to open and direct the pliers 10 and give the hand greater hold.

Due to the large-pored and blunt surface design of the insulating handles 21, 22 is the protection against slipping and slipping of the hand or fingers from the Handle legs 17, 18 increased even further; because on the one hand the surface roughness and thus grip of the insulating handles 21, 22 is increased, on the other hand the large-pored surface hand-sweat-absorbing properties, so that too the risk of slipping a damp hand is reduced.

The second exemplary embodiment shown in FIGS. 4-6 shows one instead of the pliers Power side cutter 110. For the parts that correspond to the first exemplary embodiment, are used in the second embodiment by 100 larger reference numerals, so that thereby reference is made to the description of the first exemplary embodiment and Repetitions are dispensable.

In the second exemplary embodiment, the design of the handle legs 117 corresponds to 118 essentially that of the first exemplary embodiment. The only difference is that the wide outer surfaces 134, 135 on the upper and lower sides of the solid head 130 extend continuously in the same plane as that

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Brolt outer flaps 125, 126 on the top and bottom of the head 130 subsequent portion of the insulating handle 121, in such a way that the entire Insulating handle 121 over a whole length constant, in the direction parallel to the hinge axis 112 and from the top to the bottom of the wide outer surfaces 125, 126 measured ^ thickness. Just as the insulating handle 121 is designed, the insulating handle 122, which is a mirror image of it, is designed.

Claims (12)

Protection claims l. Pliers-shaped hand tools, in particular pliers, tailors, scissors or the like. Its two handle legs intended for handling, preferably outwardly curved, are each encased by an insulating handle essentially over their entire length from the free end of the handle leg approximately to the pivot joint are, characterized in that the insulating handle (21, 22) in cross section, Seen transversely to the longitudinal extension of the handle, essentially a rectangular shape rounded to the longitudinal outer surface (23) and essentially parallel to the direction the hinge axis (12) extending, flat, in this direction uncurved longitudinal inner surface (24), at right angles to the direction of the hinge axis (12) extending, flat wide outer surfaces (25,26) on the top and bottom and with a convex outward arching, with an arched transition (28,29) to the broad outer surface (25, 26) on the upper and lower side adjoining longitudinal outer surface (23), the convex curvature (27) of the longitudinal outer surface (23) being weaker than that of the arcuate transition (28,29 ^ UtId that the insulating handle (21,22) on the swivel joint (11) facing Section merges into a massive thickened head (30 or 31), the longitudinal inner surface (33) of which, when the tool (10) is closed, runs approximately parallel to the longitudinal line of symmetry (32) crossing the joint axis (12) and is also designed flat and uncurved / whose broad outer surfaces (34,35) are flat on the upper and lower side and run essentially at right angles to the direction of the joint axis (12) and its outer narrow surface (36), which runs transversely to the outer surfaces (34,35) ) is curved outward essentially in the same way as the longitudinal outer surface (23) of the remaining part of the insulating handle (21), the contour of the outer surface (36) of the head (30) _; Seen within the plane of the broad outer surfaces (34, 35), it is composed on the one hand of an end of the longitudinal inner surface (33) of the head (30) extending from the free end facing the swivel joint (11) and with a large radius towards the outside Center be? closed tool (10) is preferably on the line of symmetry (32), curved first arcuate section (37), which slopes slightly in the direction of the opposite free handle leg end (19) and ends in an acute-angled corner (39), and on the other hand from one of the corner (39) outgoing second arcuate section (38), which is concave and curved towards the line of symmetry (32) with less curvature than the first arcuate section (37) and merges into the longitudinal outer surface (23) of the rest of the insulating handle. 2. Pliers-shaped hand tool according to claim 1, characterized in that that the radius of the curvature of the first arcuate section (37) is approximately twice that of the curvature of the second arcuate section (38). 3. Pliers-shaped hand tool according to claim 1 or 2, characterized in that the part of the insulating handle (21) adjoining the head (30), seen within the plane of the wide outer surfaces (25, 26), is weak is curved outward (Fig. 1) and the longitudinal inner surface (24) with over the The longitudinal extension of the insulating handle (21) runs at a constant distance in relation to the longitudinal outer surface (23). 4. Pliers-shaped hand tool according to one of claims 1 -3, characterized in that the acute-angled corner (39) of the solid head (30) of the insulating handle (21) _(seen within the wide outer surfaces (25,26), never extends further outwards , as the most outwardly protruding surface section (40) of the longitudinal outer surface (23), preferably ends at the same height. 5. Pliers-shaped hand tool, in particular combination pliers, according to one of the Claims 1-4, characterized in that the thickness of the massive Head (30) and an adjoining insulating handle section, measured in the direction parallel to the joint axis (12) and from the top to the bottom of the wide outer surfaces (34, 35), is less than that measured in the same direction Thickness of the rest of the insulated handle section. 6. Pliers-shaped hand tool according to claim 5, characterized in that that the leg length of the Isoliergriffabschnitres greater thickness is about two Third of the total length of the grip leg is. 7. Pliers-shaped hand tool according to one of claims 1 - 4, characterized in that that the wide outer surfaces (134, 135) on the top and bottom of the solid head (130) run continuously in the same plane, like the wide outer surfaces (125,126) on the top and bottom of the the head (130) adjoining the insulating grip portion, in such a way that the entire Insulating handle (121) a constant over its entire length, in the direction parallel to the hinge axis (112) and from the top to the bottom the broad outer surfaces (125,126) measured, has thickness. 8. Pliers-shaped hand tool according to one of claims 1-7, characterized characterized in that the longitudinal inner surface (24) of the insulating handle (21) in the region of the free handle leg end (19) has a surface roughness (42), preferably a corrugation, provided surface section (43). 9. Pliers-shaped hand tool according to claim 8, characterized in that that the corrugation (42) "through the longitudinal extension of the insulating handle (21) successive Projections and depressions is formed between the projections, which are approximately parallel to one another and parallel to the hinge axis (12) in the thickness direction of extend continuously from the top to the bottom and end within the plane of the wide outer surfaces (25, 26) of the insulating handle (21). 10. Pliers-shaped hand tool according to one of claims 1 -9, characterized in that that the insulating handle (21,22; 121, 122) as a one-piece plastic part is formed and preferably made of a polyvinyl chloride (PVC), which has a relatively low hardness, cold-stabilized, break-resistant and flame-retardant is, exists. 11. Pliers-shaped hand tool according to claim 10, characterized in that that the plastic material has a Shore hardness of about 76. 12. Pliers-shaped hand tool according to claim 10 or 11, characterized in that that the plastic material has a blunt and large-pored surface.