EP0644817B1 - Grip for tools, especially for screwdrivers - Google Patents

Abstract

The invention relates to a plastic injection-moulded grip for tools, especially for screwdrivers, with regions of plastic material of different hardnesses, the harder one of which do not deform under the forces arising during use and the softer one permit slight elastic deformation, and a central hollow (5) for the tail of a tool blade (2). To provide a design which is easy to use and provides the best gripping, the invention proposes that the central hollow is in a core section (6) with a contoured outer surface (11) on which a jacket is injection-moulded. The recesses (8) resulting from the contouring of the outer surface (11) are filled with a softer plastic until a roughly circular cross-sectional shape is obtained.

Description

The invention relates to a plastic injection molded handle for tools, in particular screwdrivers, with zones of different hard plastics, according to the preambles of claims 1 and 2.

Such a booklet is known from US-A-2 985 209. There is a screwdriver shown with a plastic handle. The plastic handle has a core part, which consists of a harder material. The outer surface of the core part has a profile. The core part is encased in a jacket.

A multi-component handle is also known from DE-C-35 25 163. There, the material composition is supposed to bring an increased grip of the booklet with a uniform circumferential distribution. With a stable base body, a pressure point-avoiding hold in the operating wall is achieved. In the case of booklets with zones of plastics of different hardness, there is also the problem of storing the hinge of the tool to be inserted into the booklet with the necessary stability. For example, in a screwdriver handle, the hinge must not turn in the handle. In known screwdrivers, the zone of the handle surrounding the hinge is therefore made of a material made of harder plastic. However, the elasticity of this hard material allows screwdriver blades to be inserted into the handle only to a limited extent. Usually such screwdriver blades inserted into the finished booklet can also be easily removed. The hard one Material is generally not suitable for exerting a necessary holding force on, for example, the characteristics arranged on the hinge for torque transmission. If, on the other hand, you would insert a screwdriver blade into a handle in which the receiving cavity is surrounded by elastic, i.e. softer plastic material, this could result in better anchoring to prevent the blade from being pulled out, but operating-related deformations could lead to a loosening of the connection between the Angel handle.

Knowing this specification, the present invention has set itself the task of designing a generic booklet in a structurally advantageous embodiment so that the elasticity of the booklet is increased with optimal cohesion of the zones, in particular a high compensation depth of the actuation-related deformations is achieved.

This object is achieved by the invention specified in claims 1 and 2. The dependent claims 3-12 relate to advantageous developments of the generic booklet.

As a result of such an embodiment, a generic booklet with increased use stability is achieved: in the article according to claim 1, the jacket consists of a harder material. The recesses are no longer filled by the jacket itself until a circular cross-sectional shape is achieved. Rather, the jacket itself consists of depressions which result from the profiling of the jacket surface of the core part. These depressions should then be filled with a softer plastic until an approximately circular cross-sectional shape is achieved. As a result, the entire outer surface is not provided with a soft plastic. It are the depressions of the hardness jacket, which are filled with soft plastic. According to claim 2, a hard core part should have a profiled lateral surface. This profiled outer surface is encapsulated by a soft material. The depressions resulting from the profiling of the outer surface of the core part are filled with the soft material. The core part should have at least one radial predetermined breaking point, which should break open when the blade is inserted. The core part should move apart due to its hardness. The jacket yields due to its elasticity and is able to press the expanded core part together again after insertion of the hinge, so that the hinge is held firmly in the core part. Wings or the like arranged on the screwdriver blade, by means of which a torque is to be transmitted to the tool, then no longer lie in the soft plastic material, but in the hard plastic material. By means of the cross-sectional profiling of the core part, which is in particular gear-shaped or star-shaped, according to the invention, torque can be transmitted to the blade from a soft material surrounding the hard core part without loosening in connection with the hinge / handle. In the embodiment according to the invention, the elastic holding forces which secure the rod against being pulled out of the core part do not have to be applied by the hard plastic material, but can be applied by the soft material surrounding the hard plastic material. The effect of the elasticity of the softer area can be transferred to the hinge via an essentially inelastic displacement of areas of the core part. In terms of manufacturing technology, it is advisable for the core part to have the predetermined breaking point parallel to the axis of the To produce a concave cavity. This then results in a part or area of hard material which is trimmed and runs parallel to the axis of the hinge and which clamps the hinge area inserted into the handle between them. Core areas separated by the slot are then provided, which are pressed against one another due to the elastic plastic material surrounding the core. It is provided that the hard core part forms a dome overlapping the front end of the cavity, this also prevents axial displacement of the hinge if, for example, the handle is used in connection with a screwdriver, and the same is acted upon as a punch or the like with a hammer. The core part preferably has several, in particular two or four, radial predetermined breaking points arranged in a uniform circumferential distribution. These predetermined breaking points are formed by injecting webs arranged between the outer surface and the inner cavity surface, which then break when the rod is driven in. It can be provided that wings are provided on the hinge, which radially emerge from the preferably rectangular or round hinge body and plunge into the gap formed by the broken predetermined breaking point and thus come to rest between two parts of the core part. Because of the elastic action of the parts of the hook core zone which form when the hinge is driven in, the gap compresses again after the wing has passed through, so that the hinge can only be pulled out of the handle again by means of a high tensile force. The sheath surrounding the hard core part is preferably made of polyethylene or polypropylene and does not need to be, but can be extrusion-coated with a sheath made of preferably harder material. Will that be the cross-sectional profiled The jacket surrounding the core part is not encapsulated by additional plastic, so the outer contour of the jacket is preferably made round in cross-section and forms the surface of attack for the hand of the user with its surface. In particular if this elastic sheath is still encapsulated with a sheath, which consists of a harder plastic material, this sheath can consist of a plastic foam. It is preferably considered to use a light material as the plastic foam so that the screwdriver can swim. A further development of the invention provides that the core part is made of a soft material and is encapsulated by a harder jacket area. For this purpose, the procedure is such that the central cavity is located in a core part with a profiled lateral surface, which is encapsulated by a jacket of approximately constant wall thickness made of harder plastic, the depressions resulting from the profiling of the lateral surface until an approximately circular cross-sectional shape is achieved with a softer one Plastic are filled. The corresponding profiling creates an intimate, slip-free bond between the different hard plastics. In an alternation of valley and mountain in the circumferential direction, the core part is now overlaid by the layer of harder material. Their gaps are then filled. In this way, profile in profile interlocks. The corresponding waveform also creates a larger contact area between the composite plastics. There the core part is enclosed by a relatively harder plastic, the core part itself can be significantly less hard, which also has the advantage that the elasticity or flexibility of the booklet continues into the inside of it, i.e. violent deformations find a large amount of compensation . The jacket wall acts like an elastic or, to some extent, flexible hoop. All this leads to an even more palpable shape, especially since the well-known usage habits are retained in full in an advantageous use of the depressions provided by the constant wall thickness for filling the softer plastic, only that the evenly distributed soft spots can now be realized more cheaply. The booklet is easy to hold. A balanced, evenly distributed and therefore optimal mechanical bond with regard to the forces occurring on or in the booklet is achieved with simple means if the cross section of the core part is profiled approximately in the form of a gear wheel. In this respect, grooves are formed in the longitudinal direction of the booklet in a uniform arrangement and exactly distributed in an angle. On the one hand, for technical reasons (one injection point on each side of the joint is sufficient) and, on the other hand, in order to achieve a cross-deep connection of the fillings, it is further proposed that the individual fields of the filled-up depressions lying one behind the other in the circumferential direction be provided by a circumferential, a groove of the jacket filling rib softer plastic material are connected. The fillings "hold by the hand". In addition, the grooves act as distribution channels for the spray compound. It is also advantageous that the depth of the groove extends into or to the core part. As a result, a radially directed anchoring of the fillings on or in the core part can be produced even when the relatively harder jacket passes through. In addition to cross-linking to the jacket, this represents an overall high mechanical stress-resistant connection. Finally, it is of even independent importance that the core part consists of porous injection-molded recycling material. Here again primarily plastic is thought of, so that in this way an environmentally conscious measure takes effect, namely to use "old material". The mass forming the core part has the far larger proportion of material, which core part is surrounded by the hard new plastic mass in the manner of a cladding layer to stabilize the significantly lower material proportion. The core part is in a pocket. The porosity can be driven up to the floatability of the booklet (plus blade). The central cavity will generally be molded around the hinge or the hinge will be inserted into such a cavity. In the latter case, their means of securing against rotation are designed in a cutting-like manner (cutting rod). It is further envisaged that in a booklet as described last, the area described there as the rich core part, which preferably consists of a recycling material, again has a hard inner core part, which then has the good torque transmission properties mentioned at the outset and is particularly suitable for subsequently equipping the magazine with tools (blades).

Fig. 1

ein das erfindungsgemäße Heft aufweisender Schraubendreher in Seitenansicht,

Fig. 2

eine Unteransicht des Heftes, und zwar gegen das klingenabgewandte Ende des Schraubendrehers gesehen,

Fig. 3

das Kernteil des Schraubendrehers in Seitenansicht,

Fig. 4

den Schnitt gemäß Linie IV-IV in Figur 3,

Fig. 5

das in eine Spritzform eingebrachte Kernteil mit umspritztem Mantel aus härterem Kunststoff,

Fig. 6

einen Querschnitt hierzu, folgend der Linie VI-VI in Figur 5,

Fig. 7

den Schnitt gemäß Linie VII-VII in Figur 5, vergrößert, die nutbildenden Füllstücke veranschaulichend,

Fig. 8

das aus der Spritzform genommene Zwischenprodukt des Schraubendrehers, also vor Auffüllen der Vertiefungen mit einem weicheren Kunststoff, die Nuten verdeutlichend,

Fig. 9

den Schnitt gemäß Linie IX-IX in Figur 8, vergrößert,

Fig. 10

einen der Figur 9 entsprechenden vergrößerten Querschnitt nach Auffüllen der Vertiefungen, (hier nur als halber Schnitt wiedergegeben),

Fig. 11

eine dem Schnitt gemäß Figur 7 ver gleichbare Darstellung einer Variante bei Umspritzen des Mantels und

Fig. 12

diese Variante in Darstellung wie Figur 10,

Fig. 13

ein Heft eines Schraubendrehers einer weiteren Ausführungsform,

Fig. 14

das Heft gemäß Figur 13 mit eingesteckter Klinge,

Fig. 15

eine Darstellung eines Heftes gemäß Figur 13 im Querschnitt gemäß der Linie XV-XV und

Fig. 16

einen Querschnitt durch eine weitere Ausführungsform der Erfindung.

The subject matter of the invention is explained in more detail below on the basis of an illustrative embodiment. It shows:

Fig. 1

a screwdriver having the handle according to the invention in side view,

Fig. 2

a bottom view of the booklet, as seen against the end of the screwdriver facing away from the blade,

Fig. 3

the core part of the screwdriver in side view,

Fig. 4

the section along line IV-IV in Figure 3,

Fig. 5

the core part inserted into an injection mold with an encapsulated jacket made of harder plastic,

Fig. 6

5 shows a cross section for this, following the line VI-VI in FIG. 5,

Fig. 7

the section along line VII-VII in Figure 5, enlarged, illustrating the groove-forming filler,

Fig. 8

the intermediate product of the screwdriver removed from the injection mold, i.e. before filling the recesses with a softer plastic, illustrating the grooves,

Fig. 9

the section along line IX-IX in Figure 8, enlarged,

Fig. 10

9 shows an enlarged cross section corresponding to FIG. 9 after filling in the depressions (shown here only as a half section),

Fig. 11

a ver the section of Figure 7 comparable representation of a variant in overmolding the jacket and

Fig. 12

this variant in representation like FIG. 10,

Fig. 13

a booklet of a screwdriver of a further embodiment,

Fig. 14

the booklet according to FIG. 13 with the blade inserted,

Fig. 15

a representation of a booklet according to Figure 13 in cross section along the line XV-XV and

Fig. 16

a cross section through a further embodiment of the invention.

A booklet H is assigned to the screwdriver shown in FIG.

The booklet H is seated on the end 3 of the screwdriver blade 2 which has a cutting edge 1 and the end 3 which has an anti-rotation cutting edge or wing 4.

With other tools, such as a file, the end 3 would be the hinge.

Said end 3 extends more or less long in a central, longitudinal cavity 5 of the booklet H.

The screwdriver blade 2 is made of steel.

The booklet H is made of plastic, divided or divided into zones of different hardness.

A first zone is formed by a core part 6. The latter brings the largest proportion of material accumulation and is tough-plastic.

A second zone forms a sheath 7 enveloping the core part 6. The latter consists of hard plastic.

A further and thus third or last zone results from fillings 9 made in depressions 8 of the jacket 7. In this regard it is plastic that can be deformed when actuation loads occur and can be classified in the soft-elastic category.

The three components mentioned lead to a gripping sympathetic booklet H, via which a high torque can be applied without causing painful pressure points on the operating hand.

On the other hand, however, the cohesion of the zones is ensured, not only because of the interconnection of the individual plastic zones with one another, but also significantly influenced by a special type of profiling. This results in detail from the sectional representations listed above. Thus, the core part 6, seen in cross section, consists of a gear-shaped profile. Its tooth-like projections 10 are trapezoidal in shape and leave between them, seen in cross section, the V-shaped notch valleys mentioned recesses 8. Projections 10 and recesses 8 lie in a uniform angular distribution and create a fairly large circumferential circumferential surface 11. There are a total of six projections 10 realized with the corresponding number of depressions 8, which are interrupted in the longitudinal direction (see FIG. 8). The cross-sectional proportions of projection 10 and recess 8 are approximately the same. The length of the flank of the trapezoidal projections 10 corresponds to the flattening of the projections on the head side; their head width goes roughly twice into the base of the trapezoid.

The jacket 7, which crosslinks with the jacket surface 11, follows the mountain / valley circumferential corrugation. The jacket 7 made of harder plastic and applied by injection molding retains its wall thickness approximately unchanged. This is about 2 mm. The depressions 8 are characterized and are also declared 8 on the coated product.

The lateral surface 11 merges at one end into a slightly curved dome 12. The latter forms the end of the core part 6 facing away from the cutting edge 1 and is likewise covered by the jacket 7 made of harder plastic and consequently bears the reference number 7.

At the end opposite the crest 12, at which the entrance to the cavity 5 is located, the jacket formed from harder plastic is used to create a collar 12. The collar 12 clearly bears in relation to a ring groove 14 of the booklet H lying in front of it. Said fillet 14 extends well over a third of the length of the booklet H and, after a collar-like extension 15, adjoins a second fillet 16 of approximately the same axial length as 14. The latter (16) continues to rise into a gripping zone 17 of the largest diameter of the booklet H, in order to then descend in the same way into a third ring fillet 18, which enters the mentioned crest 12 via a convexly rounded end zone.

The ring fillets 14, 16 and 18 are shown somewhat exaggerated in their arching. This is based on the ergonomically mature booklet form, as it emerges from the applicant's DE-C-12 98 060 and is fully incorporated here.

The collar 13 reaches approximately the diameter of the collar-shaped widening 15 and is non-circular on its periphery, in particular hexagonal, so that the tool does not roll away. The flattened areas are designated 19 and result from FIG. 1.

In the cross-sectional area of the collar-shaped widening 15 as well as that of the gripping zone 17 of maximum diameter and the crest 12, the profiling is interrupted in favor of an undisturbed, continuous, circular cross-section. Gripping zone 17 and collar-shaped widening are also convexly curved in the longitudinal direction of the booklet. Here, therefore, a rotationally symmetrical portion of the harder gripping zone "comes to light". In order to realize the circular cross-sectional shape also with respect to the richly profiled zones and, moreover, to increase the grip of the booklet H, the depressions 8 are filled with the further plastic until an approximately circular cross-sectional shape is achieved. Reference is made to the sectional views. Of course, this does not need to be an exactly circular cross-sectional shape. There could already be a multi-sided sequence of surfaces in the circumferential direction, this also in such a way that the depressions 8 form so-called single grooves, into which the tissue of the operating hand is easily formed, giving in to the filling 9.

As can be seen in FIG. 3 as an intermediate product, the formation of depressions 8 limited to the axial length of the second and third ring fillets 16, 18 leads to an approximately oval outline with circumferentially distributed fields F. The boundary of the fields F is formed by an edge 20 on the jacket wall side of the depressions 8. Their base 21 is the cutting-like groove of the V-valleys and ends at a radius distance in front of the rounded ends of the elongated fields F. Both ends pushed together would form a hollow cone tapering towards the inside of the core part 6.

The edge 20 could also be undercut for a connection stop between the jacket 7 and the core part 6 that goes beyond the networking. This is realized at the rounded ends of the fields F and shown in FIG. 8, see reference number 20 '.

Viewed in the circumferential direction, the fields F have a width which corresponds to two to three times the distance dimension between the fields F oriented in the longitudinal direction (on the surface), each leaving a web 22.

As can be seen in FIG. 1, the individual fields F are in material connection beyond the webs 22 of the fields F. This is achieved by that the individual fields F of the filled-in depressions 8 which are adjacent to one another in the circumferential direction and one behind the other in the longitudinal direction are each connected by a groove 23 running in the circumferential direction. This creates a circumferential spray composite for the fillings 9. The plastic material passing through the groove 23 is declared there as a filling rib 24.

The ribs 24 lie halfway along the fields F, all the way around in a common plane.

The grooves 23 forming the ribs 24 are kept free when the jacket 7 is sprayed on by fillers 25, which are taken into account in the mold cavity N, on an injection mold Sp. The latter can end in the cross section of the jacket 7, as can be seen in FIG except for the lateral surface 11 of the core part 6 forming the heart of the booklet H. In this way, the softer plastic, which forms the fillings 9 and ribs 24, would have an anchorage directly at the other two zones, namely on the jacket 7 and the core part 6.

The version of the filler pieces 25 which extends radially inward except for the heads of the projections 10 which are trapezoidal in cross section is shown, for example, in FIG. 7. The filler pieces 25 can be seen there, as far as into the filling space 26 forming the jacket 7 the injection mold Sp continues, to the bottom of the filling space.

In the dividing joint 27 of both mold halves of the injection mold Sp, the corresponding filler 25 is of course partially formed there by the mold halves.

The core part 6 consists of porous injection-molded recycling material. This has a particular advantage insofar as the quality of the corresponding waste material is not of primary importance. It must be sprayable and can have a mixed structure of even medium hardness. The structure achieved whatever is stabilized by the sheath 7 made of a harder type of plastic surrounding the core part 6 on the other hand. On the other hand, a relatively soft filling of the pocket enclosed by the sheath 7 can also be advantageous for a plug-in assignment of screwdriver blades 2 with self-cutting wings 4.

Another advantage of such a porous structure is a higher load, even an elastically absorbing framework structure, so that extreme deformations of the booklet H do not lead to detachment of the interconnected plastic layers. In addition, there is also an additional component, the changing depth engagement of the layers with respect to one another in the circumferential direction. Effective torsional loads on booklet H always go against locking flanks due to the cross-section mentioned gear-shaped profile of the core part 6 and the jacket 7. The fillings 9 are compressed in the direction of the pockets receiving them.

A final advantage results from the porous structure containing gas inclusions for usable floating ability of the booklet H, so that the screwdriver etc. is not lost in such work situations. It can be an open-pore or closed-pore framework structure, and in the case of the open-pore structure, the end face of the core part 6 facing the cutting edge 1 cannot penetrate there by water or the like. This jacket wall zone, which closes the entrance of the cavity 5 up to the jacket surface of the screwdriver blade 2, bears the reference symbol 28.

The profiling essentially follows the corrugation of the magazine due to the throat.

Another exemplary embodiment of the invention is shown in FIG. There, the booklet 100 has a hard core part 102 which has a central cavity which adjoins a central cavity 107 in alignment. The core part 102 has a dome 108 into which the cavity 104 adjoining the cavity 107 runs out. The core area 102 of this booklet is made of a hard plastic material, in particular polycarbonate. This hard plastic area is star-shaped in profile (Figure 15). The stars 103 protrude radially into an area 101 made of a softer, elastic plastic material. Zone 101 forms the outer contour of booklet 100 from softer plastic. This zone forms the surface 106 of the booklet. In the exemplary embodiment, the booklet has a cylindrical outer cross section. The star-shaped jacket cross section of the inner core part forms predetermined breaking points 110. These predetermined breaking points are formed in that essentially two mirror-symmetrical core part halves are connected to one another via material webs 110. This connection of the two halves by means of material webs 110 forms slots 105 which are filled with softer material. In the exemplary embodiment, the cavity 104 has a rectangular cross section.

If, for example, a blade with a screwdriver head is inserted into the cavity 107 in this exemplary embodiment, the blades 109 of the blade should be oriented such that they are aligned with the predetermined breaking points 110. When inserted, which is applied to the blade in the axial direction when force is applied, the wings 109 of the blade then divide the webs 110 of the predetermined breaking point. The two opposite, resulting parts of the core part 102 are thereby pressed apart against the elastic restoring forces of the zone 101 made of elastic material. As soon as the wing area has passed through an area of the cavity, closes due to the elastic contact pressure of the two divided hard core parts, the slot presses so that the blade is secured against being pulled out. The blade is driven into the cavity 104 until its end face abuts the rear end face 104 'of the cavity 104. The end face of the blade thus lies in the dome 108 and can be subjected to axial forces.

The cross-sectional area of the height 104, which, as shown in particular in FIG. 16, can also have a round cross-section, is preferably smaller than the cross-sectional area of the blade to be inserted into the cavity 104. This ensures that after breaking the predetermined breaking points, which occurs when the wing 109 is pushed through, a radial load on the blade is always guaranteed.

In the embodiment shown in Figure 16, the shell 101 is overmolded with a shell 112 made of hard material. This embodiment corresponds essentially to FIG. 9, which is why reference is made here to the description of this exemplary embodiment (FIG. 9). In contrast to the exemplary embodiment in FIG. 9, the exemplary embodiment in FIG. 16 has a central hard core 102, with a total of four predetermined breaking points 110, which, as in the exemplary embodiment in FIG. 15, are likewise formed by webs which leave slots 105 into which soft material is in turn injected.

An advantage of this embodiment, in which a central zone made of elastic material is provided, which is surrounded by a hard shell, is that the elastic forces that act on the core part result from a compressibility of the elastic zone 101. The hard core part 102 formed with a star-shaped profile is thus acted upon by the restoring force of the compressible plastic material of zone 101 after the predetermined breaking points have been destroyed when the hinge is driven in in the radial direction.

With regard to the outer contour and outer structure of this booklet, reference is made to the description of FIG. 9, in particular the webs and the recess and the fillings with softer material on the screwdriver surface have been described.

The split design of the hard, cross-sectional core part has the particular advantage that the wing 109 or the like of the hinge not only serves for torque transmission, but also as a barb for axially fastening the hinge in the handle. Due to its profiling, the hard core part forms an enlargement of the torque transmission area.

Claims (12)

1. Injection-moulded plastic handle (H) for tools, in particular screwdriver, with zones of plastics with different hardness, of which the harder one is non-deformable by the forces occurring due to operational loading, but the softer one allows minor elastic deformation, and with a centrally located receiving cavity (5) for the tang (3) of a tool blade (2), wherein the central cavity (5) is located in a core portion (6) with a profiled peripheral surface (11), around which a casing (7) is injection-moulded, characterised in that the casing (7) is made of a harder material and comprises recesses (8) which result from profiling of the peripheral surface (11), and the recesses (8) are filled with a softer plastic until a more or less circular cross-sectional shape (18) is obtained.
2. Injection-moulded plastic handle (H) for tools, in particular screwdriver, with zones of plastics with different hardness, of which the harder one is non-deformable by the forces occurring due to operational loading, but the softer one allows minor elastic deformation, and with a centrally located receiving cavity (104) for the tang of a tool blade, wherein the central cavity (104) is located in a core portion (102) around which a casing (101) made of a softer material is injection-moulded, wherein the recesses (111) resulting from profiling of the peripheral surface (102') are filled with the softer plastic of the casing until a more or less circular cross-sectional shape is obtained, characterised in that the core portion forms at least one, in particular two or four, radial predetermined breaking points (110) preferably arranged in uniform circumferential distribution.
3. Handle according to claim 1 or 2, characterised in that the cross-section of the core portion (6, 102) is profiled more or less in the shape of a gear or star.
4. Handle according to claim 2, characterised in that the core portion consists of a harder plastic portion, in particular polycarbon.
5. Handle according to one or more of claims 2 to 4, characterised in that the core portion (102) forms a dome (108) covering the end (104') of the cavity (104).
6. Handle according to claim 1 or 3, characterised in that the core portion forms at least one, in particular two or four, radial predetermined breaking points (110) preferably arranged in uniform circumferential distribution.
7. Handle according to one or more of the preceding claims 2 to 6, characterised in that the predetermined breaking points are formed as webs of material (110) arranged between the peripheral surface (102') and the inner surface of the cavity.
8. Handle according to one or more of the preceding claims 2, 3, 4, 5 or 7, characterised in that the casing (101) made of an elastic, in particular compressible plastic, in particular PE or PP or a foam plastic, comprises a surrounding injection-moulded sheath (112) of harder plastic material.
9. Handle according to one or more of the preceding claims 1, 3, 6 or 7, characterised in that the softer one of the zones of plastics with different hardness penetrating each other, of which the harder one is non-deformable by the forces occurring due to operational loading, allows minor elastic deformation however, and the core portion (6) is surrounded by an injection-moulded casing (7) of more or less constant wall thickness made of harder plastic, wherein the recesses (8) resulting from profiling of the peripheral surface (11) are filled (filling 9) with a softer plastic until a more or less circular cross-sectional shape is obtained.
10. Handle according to one or more of the preceding claims, characterised in that individual areas (F) of the filled recesses (8), located one behind the other in the circumferential direction, are connected by a rib (24) of softer plastic material extending in the circumferential direction and filling a groove (23) of the casing (7).
11. Handle according to claim 10, characterised in that the groove (23) in its depth extends as far as the core portion (6).
12. Handle according to one or more of the preceding claims, characterised in that the core portion (6) is made of porously injection-moulded recycled material.

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