Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25G—HANDLES FOR HAND IMPLEMENTS
  • B25G1/00—Handle constructions
  • B25G1/01—Shock-absorbing means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25G—HANDLES FOR HAND IMPLEMENTS
  • B25G1/00—Handle constructions
  • B25G1/10—Handle constructions characterised by material or shape
  • B25G1/105—Handle constructions characterised by material or shape for screwdrivers, wrenches or spanners

Definitions

• the invention relates to a handle for
• the invention relates to a method for producing such a handle.
• Handles of this type are today mainly made of plastic by injection molding. For tools of higher quality as a good ergonomic design and feel of the handles are sought. In such handles made of two plastic components, the tool is anchored in a handle core made of hard plastic, and this handle core is encapsulated with a handle shell made of soft plastic, cf. For example, EP 0 627 974 B1.
• the handle shell made of soft plastic has a certain elasticity and gives a more pleasant gripping feeling than a handle, which is made only of hard plastic.
• the soft plastic also has u. U. a higher coefficient of friction than hard plastic. Therefore, with such a "2-component handle" higher torques can be transmitted as with a handle of the same size made of hard plastic. This is important for handles for screwdrivers, screw clamps, etc.
• the invention is based on the object, taking into account the manufacturing possibilities and the mechanical properties of a handle for a screwdriver, a screw or other device with which a force exerted on the outer surface of the handle by the user torque to an arranged in the handle output member is transferable, and to propose a method of making the same, the Ergonomics and feel of the handle and / or the adjustment options of the handle to the respective hand of a user are improved, and thereby a good force and moment transfer from the hand of a user to the handle and on this example.
• On an output element such as a functional part or a Blade of a screwdriver is possible.
• the object underlying the invention is achieved by a handle according to the features of claim 1. Further embodiments of the handle for a screwdriver emerge according to the features of the dependent claims 2 to 32. Another solution of the invention underlying object is given by a A method according to the features of claim 33. Further embodiments of the method according to the invention emerge from the dependent patent claims 34 to 38.
• the invention for use of the handle for a screwdriver will be explained for simplicity.
• the embodiments are analog transferable to the use of the handle for a screw clamp or other device with which a force exerted on the outer surface of the handle by the user torque to a arranged in the handle output member is transferable.
• the invention is based on the finding that in the case of a design of a handle in accordance with the prior art mentioned at the outset, a conflict of objectives is to be solved:
• the adaptability of the grip to the hand of a user and to hands of different sizes and thus an enlargement of the contact surface between the hand and the grip is increased when the stiffness of the grip jacket forming material is reduced.
• a possible stiff or hard material of the grip is desired for a transmission of high torques on the handle and / or for a stable even in hard applications lateral surface.
• This conflict of objectives is taken into account according to the prior art by a stiffness optimization depending on the individual case or by portions of the handle shell with high rigidity, which serve primarily a transmission of torque, and portions of the handle shell with low rigidity, which should improve the feel of the handle.
• 2-component handles as are known for example from DE 35 25 163, a compliance is not given in the area of the entire grip, because the hard grip core forms part of the grip surface and only other portions of the handle surface are coated with soft plastic.
• the handle sheath made of soft plastic in known handles usually only with a relatively small wall thickness, for example between 1, 5 and 3 mm, is formed and therefore not or only limited yielding.
• a design of the lateral surface of the handle with the soft plastic makes the lateral surface susceptible to damage.
• the handle has an outer region which has a closed lateral surface and interacts with the user's hand.
• the outer region is formed with an elastic material having a first rigidity.
• the outer region can be an integral grip shell or a grip shell having a surface with different partial regions, for example a partial region made of a hard plastic and other partial regions made of a soft plastic.
• the different partial regions can be arranged alternately in the longitudinal direction and / or in the circumferential direction.
• At least one chamber whereby either a single existing circumferentially rotating chamber, all chambers in several evenly distributed in the circumferential direction chambers or a part of several evenly distributed in the circumferential direction Chambers can be meant.
• the second rigidity of the at least one chamber is less than the aforementioned first stiffness.
• a dimensioning of the outer region for example, the extent in the longitudinal direction of the handle and / or in the radial direction, the inner region, the chambers and the number and arrangement and the choice of the first and second stiffness is such that upon application of the handle with usual Surface pressures of the outer region is deformable and with this deformation, a deformation of the chambers can be brought about. Accordingly, the inner region does not support the outer region as rigidly as possible and thus limits possible deformations of the outer region, but rather represents a radially yielding support. On the other hand, the user's hand acts on the outer region with a comparatively high first rigidity, resulting in a good Transmission of torque is possible. While the prior art follows the prejudice that the stiffness must increase radially inward in a handle, so the invention treads for the first time the way that - at least in partial peripheral areas - the stiffness can decrease radially inward.
• the documents DE 101 13 368 A1 and DE 197 32 421 C2 disclose handles for a hammer.
• the user accelerates over the handle via a return movement of the hammer to an impact velocity, which defines the impulse during the hammer blow.
• the cited documents propose to provide an air pocket or a passage in the direction of impact, ie on the top and bottom of the handle, in Area of which can collide with the shock, the top and bottom of the handle, so that the impact is transmitted to the user with the interposition of suspension and / or damping.
• a handle insert for a screwdriver which is not about the attenuation of a possible shock, but rather on the one hand to a u.
• the internal chambers are evenly distributed over the circumference of the handle or extend completely in the circumferential direction.
• a dimensioning and selection of the stiffnesses takes place such that the rigidity of the handle in the radial direction is smaller than the rigidity of the handle in the circumferential direction.
• the chambers are formed as hollow chambers.
• the second stiffness in the region of the hollow chambers is zero. This means that the outer regions radially outwardly of the hollow chambers form cantilevered areas, which can be made yielding depending on the selected radial wall thickness even with relatively high first stiffness under an evasive movement in the hollow chambers.
• the chambers may be arranged any material with the second stiffness, for example, be injected a soft plastic or a liquid, a powder or a gel, these materials fill the chambers in whole or in part.
• the volume of the chambers may each remain constant by deforming portions of the outer region associated with the chamber radially inwardly, whereby in this area the chambers are reduced, while another portions of the same chambers can expand radially and accordingly the associated outer region is deformed radially outward.
• a plurality of chambers are connected to each other, so that u. One chamber reduces its volume due to deformation while another chamber increases its volume.
• a gel can be used, which is displaced in one chamber or a portion of the chamber in another portion of the same chamber or another chamber on which or a less strong pressure of the user's hand acts.
• a gel can be used, which is displaced in one chamber or a portion of the chamber in another portion of the same chamber or another chamber on which or a less strong pressure of the user's hand acts.
• the chambers may be oriented arbitrarily, for example with a longitudinal axis, which is oriented at a projection in a longitudinal plane of the handle obliquely to the longitudinal axis of the handle or transversely thereto.
• the chambers may be "spirally" wound around the longitudinal axis of the handle.
• the portions extend approximately in the longitudinal direction of the handle.
• the casting cores for forming the chambers can be removed in a simple manner in the longitudinal direction in a production of the handle by means of an injection molding process. It is also possible that several chambers are arranged lying one behind the other in the longitudinal direction. This may, for example, be the case when the outer region consists of a one-piece gripping jacket, which is made in the manner of a sleeve by itself and is pushed onto the handle core.
• the chambers are formed in the radial direction with a curvature.
• the wall thickness of the outer area can be specified in this area, so that the wall thickness can be specified constructively according to the requirements, wherein in areas of reduced wall thickness, a particularly elastic behavior of the outer area can be brought about ,
• the Forming the wall thickness and influencing the elasticity can be achieved by the curvature of the outer contour of the chambers in the longitudinal direction does not follow the outer contour of the handle.
• the curvature should be approximately matched to the curvature of the outer contour of the handle.
• the chambers may have a substantially constant over the longitudinal axis cross-section, which, for example, for a production of at least portions of the handle in an injection molding process, the hollow chambers can be molded with casting cores constant cross-section, whereby a removal of the casting core is simplified.
• the chambers can also have a variable cross-section over the longitudinal axis, whereby the possibilities of influencing the rigidity and the variability can be increased over the longitudinal axis.
• the chambers can be subsequently introduced, for example by means of holes or milling, in the inner region.
• the inner region of the handle is produced in an injection molding process, it is u. U. advantageous if the chambers are produced by casting cores during the injection molding process.
• the cores can not be removed directly on a straight or curved path from the inner region due to a curvature of the chambers and / or as a result of variable cross-sections, the elasticity of the inner region and / or the cores can advantageously be utilized, so that during removal of the casting cores deformations of the inner region and / or the casting cores occur.
• the inner region can optionally be formed in the grip core and / or in the grip shell.
• the inner region is in a radial transitional formed area between a handle core and a handle shell.
• the chambers for example, in half, bounded by the handle core and the handle shell. This means that the chambers do not have to be introduced into the interior of the handle core and grip, but rather be formed by recesses or grooves of the handle core and / or the grip, recesses of handle core and grip coat can merge into each other.
• Such recesses or grooves can be produced, for example, by suitable design of a mold during injection molding of the handle core and / or the grip jacket or by subsequent introduction into the grip core and grip shell.
• multiple chambers are separated by webs.
• their material properties, profile and / or extent in the circumferential direction and radial direction can be done further influencing the feel and stiffness of the handle.
• a connection of the outer region with lying within the inner region of the central areas of the handle, so that the design of the webs specifically affects the transmission of torque from the outer region to the central region, for example to a functional part of a screwdriver can be.
• the webs may be oriented approximately radially in a cross section through the handle, with the result that the webs are acted upon by the pressing of the user's hand on the handle in the radial direction, ie in the longitudinal direction of the webs in the aforementioned cross section, while the transmission of torque applied to the webs with a shear stress in the circumferential direction or a bending moment about an axis parallel to the longitudinal axis of the handle.
• the invention makes it possible that the webs in the cross section of the handle are inclined relative to a radial orientation at an inclination angle ⁇ .
• the angle of inclination ⁇ the haptic properties and the stiffness can be further influenced by predetermining the stress of the webs with a normal force in the radial direction, with a bending moment and the mentioned shear stress in the use of the handle.
• webs of different inclination angle ⁇ are present.
• the chambers are preferably introduced via one side of the handle in the handle core and / or handle shell such that after the introduction of the chambers have these openings.
• These openings can be closed according to a proposal of the invention by means of a frontal cap, esp. At the rear end, which in this case thus closing and possibly sealing the chambers, but can also be multifunctional by the cap, the end of the Outside surface of the handle forms.
• the cap has at least one, the openings occlusive, rigid or elastic closure element.
• This may be a closure element for only one chamber or a single closure element for a plurality of openings of the chambers.
• the closure element is designed as a ring.
• Such a ring or a closure element may be provided in addition to the closure of the openings with a color coding in the event that handles of different types are present.
• the cap is rotatable, which has advantages when applied to the cap normal forces in the direction of the longitudinal axis of the handle, for example, a screwdriver while the torque applied off the cap on the handle or a functional part of a screwdriver becomes.
• the cap can be connected via a positive connection with the handle core and / or handle shell, for example via a latching connection, a locking connection, a thread o. ⁇ . Also possible is a frictional connection of the cap.
• the cap is connected via a cohesive solid connection.
• the cap can also be molded directly onto the further elements of the handle, in particular the grip core and / or grip shell.
• a soft plastic having a hardness of 30 or 40 to 105 Shore A, for example, 30 or 50 to 85 Shore A, in particular 55 to 83 Shore A.
• the chambers are bounded in the circumferential direction with webs and radially outwardly of the handle shell.
• the grip casing may be formed with the end faces of the webs and with transition areas extending between these end faces.
• the transition areas can be "strip-shaped" and supported on the end faces of the webs. Are the webs sufficiently rigid, they can even stiff transmit torque.
• the transition areas are based on these rigid webs, so that forces applied in the transition regions are also transmitted to the webs, resulting in a good transmission of the torque at u. U. simultaneous yielding design can be given in the radial direction.
• Extended possibilities for shaping the stiffness arise when materials with different stiffnesses are used for the webs, a material arranged in the chambers and the grip jacket.
• the webs may be made of the same material as the handle core, for example, in one operation for an injection molding process, or other material.
• an approximately central region of the lateral surface of the handle is formed in the circumferential direction alternately with the end faces of the webs and the transition regions.
• the approximately central region thus has the advantages explained above. In the approximately central area can thus be a particularly good
• the central region also has the area of the handle with the largest outer diameter of the lateral surface.
• This central area is preceded by a front (and / or rear) area in the direction of the longitudinal axis of the handle (downstream).
• front (and / or rear) area extend the front (and / or rear) area.
• Transition areas over the entire circumference of the lateral surface of the handle As a result, a durable, continuous front (and / or rear) area can be provided, wherein u. U. a lower radial elasticity in this area can be accepted, since a lower radial adaptability to the user's hand is sufficient, for example, because here the diameter of the handle is already reduced in size, or only edge areas of the hand rest, which do not have to transmit large forces.
• a handle core is produced, for example in an injection molding process.
• a grip core may have a recess lying inside for a replaceable functional part or be sprayed directly onto a functional part.
• casting cores are aligned in the direction of a longitudinal axis, in particular the longitudinal direction of the handle core, and distributed in the circumferential direction about the longitudinal axis.
• the casting cores are, u. U. together with the handle core, placed in a mold in which the cores (and u. U. The handle core) are coated with a handle shell in an injection molding process.
• the casting cores are removed by movement in the direction of an end face, esp. The rear end face of the handle shell after curing of the grip.
• chambers are released, which have an opening in the region of the front side.
• the aforementioned openings or the chambers are at least partially closed.
• a cap is used to close the openings, and thus the chambers. Further possibilities for influencing the stiffness arise for at least partial filling of the chambers with a material having the second rigidity.
• Handle core and handle shell with the chambers can be made separately and connected together after curing.
• the grip coat can be connected to the grip core at the same time as an encapsulation of the casting cores.
• the casting cores can be moved with the core slider in a first step above the handle core.
• the grip shell is sprayed onto the handle core, wherein the chambers are molded. After the handle shell has hardened, the grip cores can be removed from the grip shell via the movement of the core slider.
• the cap has a closure element, wherein the closure element is inserted into a mold together with the grip core and the grip shell after removal of the casting cores.
• the cap is injected in an injection molding process, for example.
• the injected material can press the closure member for closing the openings against the handle core and the handle shell and the material during the injection molding simultaneously cohesively with the handle core and / or the handle shell and the closure element connects.
• Fig. 1 shows a handle for a screwdriver in a longitudinal section.
• FIG. 2 shows a cross section M-II through the handle according to FIG. 1.
• Fig. 3 shows a further embodiment of a handle for a screwdriver in a longitudinal section.
• Fig. 4 shows a further inventive embodiment of a handle in one
• FIG. 5 shows a further embodiment of a handle according to the invention with disassembled cap in a rear view.
• Fig. 6 shows a further embodiment of a handle according to the invention in one
• Fig. 7 shows a further embodiment of a handle according to the invention in one
• Fig. 8 shows a further embodiment of a handle according to the invention in one
• FIG. 9 shows a further embodiment according to the invention of a handle in a longitudinal section.
• Fig. 10 shows a further embodiment of a handle according to the invention in one
• FIG. 11 shows the configuration of the handle according to FIG. 10 in a cross section XI-XI.
• Fig. 12 shows the configuration of the handle according to FIGS. 10 and 11 in a longitudinal section.
• Fig. 1 shows an example of a handle 10 for a screwdriver 11, wherein the handle according to the invention can be used in conjunction with any tool.
• the screwdriver 11 has a fixed or interchangeable inserted in the handle 10 functional part 12, for example, has a functional tip, not shown for an interaction with a screw or a suitable receptacle for a screwdriver use.
• the handle 10 has a handle core 13, the radially inner lying the functional part 12 while allowing a transmission of torque and normal forces in the direction of a longitudinal axis 14-14 receives.
• the grip core 13 on the side facing away from the functional tip of the functional part 12 side of a paragraph 15 has a cylindrical outer surface 16, to which an end-side extension 17 connects.
• a grip jacket 18, which is formed with a soft plastic is sprayed onto it in an injection molding process.
• the outer surface of the grip shell 18 and a free outer surface of the handle core 13 form a continuous lateral surface 19, the outer contour 44 is adjusted in terms of ergonomics for a hand average size.
• the handle 10 has six chambers 20 distributed in the circumferential direction about the longitudinal axis 14 and oriented in the direction of the longitudinal axis 14.
• the chambers 20 are distributed in the circumferential direction about the longitudinal axis 14 and oriented in the direction of the longitudinal axis 14.
• FIG. 2 start from one of the functional tip facing away from end face 21 of the grip 18, have a circular ring segment-shaped cross section and are separated in the circumferential direction in each case by webs 22 from each other, wherein the webs of FIG. 2 may be tapered radially outward or have any cross-sectional profiles.
• any number of chambers 20 may be provided.
• the handle shell 18 Radially outwardly from the chambers 20, the handle shell 18 forms an outer region 23, while an inner region 24 is formed with the webs 22 and the chambers 20. Radially inside of the inner region 24 of the handle core 13 is arranged with arranged in this functional part 12.
• the connection between the grip core 13 and the grip jacket 18 can be reinforced in that the grip core 13 has ribs 25 which are received in corresponding radial, groove-shaped recesses 32 of the grip jacket 13.
• a connection between the handle core 13 and the grip jacket 18 can be made in a positive, frictional or cohesive manner, for example by means of an injection molding of the grip jacket 18 on the grip core 13.
• the projection 17 is approximately cylindrically formed with a circumferential groove 27.
• a cap 28 has a first approximate hemispherical designating outer surface with an end face 28 which closes on the end face 21 of the chambers 20 formed openings 29.
• Radially inwardly lying the cap 26 has spring arms 30 or a spring sleeve, which can be expanded radially outwardly / may under elastic bias and radially inwardly lying latching or locking elements 31 which due to the elasticity of the spring arm 30 in the in Fig. 1st Engage position shown in the groove 27.
• the chambers 20 have a radially curved longitudinal axis 33 and an increasing radial extent in the direction of the center of the chambers 20.
• the openings 29 are closed in this case with a circular disk 34 which is plugged onto the extension 17.
• the grip core 13 and the grip shell 18 are inserted into an injection mold, in the cavities of which a cavity for the cap 26 remains free, which is filled during the injection of the plastic compound for the cap 26. Due to the buildup of pressure during the injection of the plastic compound, the annular disc 34 is pressed against the end face 21.
• the cap 26 is connected in this case cohesively to the extension 17 and the circular disk 34.
• the annular disk 34 is made of plastic.
• the annular disk 34 may be configured, for example, in handles 10 of a screwdriver for different types of screwdrivers in different colors, so that the annular disc 34 serves as a color coding.
• annular disk 34 extends to the lateral surface 19 of the handle 10 (see upper half plane of FIG. 3), while otherwise the annular disk 34 may be radially outwardly overmoulded by the material of the cap 26 (see lower half plane of FIG. 3).
• annular groove 43 can be seen, with which the hollow chambers 20 are connected to each other, for example, for a pressure equalization of a arranged in the chambers 20 gel.
• the inner region 24 is formed stepwise in the circumferential direction.
• the grip shell 18 has in the region of an inner circumferential surface radially inwardly directed projections 35 or ribs, the play in the circumferential direction receiving record in corresponding to the projections 35 in cross-section formed recesses 36 or grooves. Between the radially inner end face of the projections 35 and the bottom of the recess 36 a clearance 37 is provided, while between the inner circumferential surface of the grip 18 and the outer circumferential surface of the handle core 13, a game 38 is provided.
• the games with a deformation of the grip shell 16 can be overcome simultaneously, whereby a stiffness increase against a radial compression of the handle 10 can be given constructive.
• a non-linear increase in stiffness can be achieved.
• Handle shell 18 and handle core 13 have with the projections 35 and recesses 36 a kind of internal toothing with a rectangular profile and a corresponding external toothing. In the circumferential direction, the aforementioned teeth abut each other with a sliding fit. It is advantageous in this embodiment that increases with an increase in the contact pressure of the hand on the handle 10, the contact surface between the two aforementioned teeth, so that the torque can be transmitted via the contact force of the hand-dependent contact surfaces.
• Fig. 5 shows a rear view of the handle 10 without cap 26, in which the end face 21 is visible.
• the chambers 20 are approximately half formed by an approximately semicircular radial recess 39 of the inner circumferential surface of the handle shell 18, while the other half of the chamber 20 of a cross-sectionally approximately semicircular recess 40 or groove of the Jacket surface 16 of the handle core 13 is formed.
• the cross-sectional profiles of the recesses 39 and 40 may of course also have other shapes than those shown.
• the handle core 13 is formed at least in the illustrated cross section with a uniform hexagonal outer contour.
• the outer region 23 is bounded radially inwardly by an approximately circular inner contour 41.
• Six rectilinear webs 22 with wall thickness constant in the illustrated cross-section adjoin in a middle region 42 directly to the lateral surface 16 of the hexagonal-shaped grip core 13, cross over in the corner regions of the lateral surface 16 with adjacent webs 22 and extend up to their end regions the inner contour 41, where the webs 22 are materially and integrally connected to the outer region 23.
• resulting chambers 20a, 20b with different cross-sectional contour namely chambers 20a
• the cross section is to be referred to in a first approximation as triangular
• chambers 2Ob 1 whose cross section is to be referred to in a first approximation as trapezoidal.
• the wall thicknesses of the webs can also vary over their extension in the longitudinal direction and / or in the radial direction, as well as the arrangement to each other.
• the handle 10 has only a single, but in this case circumferential in the circumferential direction chamber 20.
• the handle shell 18 is made in the form of a sleeve extra than an injection molded part.
• the inner contour of the grip shell 18, for example, for a grip core 13 with ribs 25, is formed by a casting core, which is pulled out of this after curing of the grip 18.
• the inner contour has a radial bulge, which limits the chamber 20 radially outward.
• the elasticity of the grip 18 can be a pulling of the core for the Make possible the formation of the bulge, by expanding the handle shell 18 with a pull of the casting core.
• the grip casing 18 is attached to the handle core 13 in a subsequent assembly step, wherein ribs 25 of the handle core enter into the corresponding recesses of the grip shell 18, so that between the handle core 13 and handle shell 18, the transmission of torque is enabled.
• the grip jacket 18 has a spur toothing 45 extending over part of the diameter.
• the parts After attaching the grip shell 18 on the handle core 13, the parts are inserted into a further shape and fill this shape except for a cavity that corresponds to the shape of the cap 26 to be produced.
• a material connection of the cap 26 occurs both to the grip shell 18 and to the grip core 13.
• a torque is transmitted via the spur toothing 45 via the cap 26 into the grip core 13.
• the handle core 13 is preferably made of a hard material such as hard plastic, wood, metal or aluminum and has a smaller diameter than the handle core 13 of known 2-component handles.
• the chambers 20 may be slightly tapered to facilitate removal of the cores.
• the cross section of the chamber 20 in the region of the largest handle diameter is largest and decreases towards smaller handle diameters.
• the hollow chambers 20 may also be formed only in the form of a recess 39 from the handle shell 18 or in the form of only one recess 40 from the handle core.
• the handle core 13 is produced in a first production manner in a first injection mold, which is then inserted into a second injection mold, in which then the handle shell 18 is sprayed onto the handle core 13.
• the grip jacket 18 is made separately from the handle core 13 and pushed axially onto the handle core.
• Handle core 13 and handle shell 18 are preferably glued together.
• the chambers 20 are formed or corresponding grooves. Under certain circumstances, these grooves can complement each other with grooves in the handle core 13 to form larger chambers.
• the length of the chambers 20 preferably corresponds approximately to at least the width of the handle 10 enclosing hand.
• the chambers 20 are disposed radially inwardly of the surface of the handle 10 surrounded by the surface of the user.
• the cap 26 is preferably rotatable, wherein the cap 26 bears under axial load on the end face 21, while between the groove 27 and the latching or locking element 31st and radially inner end surfaces of the cap 26 and the end surface of the extension 17 remains a slight axial play.
• a plurality of chambers 20, in particular with a reduced radial extent are arranged one behind the other in the radial direction or offset relative to one another.
• FIG. 8 shows an embodiment which, unless otherwise stated, essentially corresponds to the embodiment according to FIG.
• the radially inner boundary of the chamber 20 is approximately rectilinear, while the radially outer boundary of the chamber 20 is curved more towards the outside in comparison to FIG.
• This has the consequence that decreases in the direction of the center of the longitudinal extent of the chamber 20, the wall thickness of the outer region 23 and a minimum reaches approximately in the range of the maximum diameter of the handle 10.
• a reduced wall thickness thus a large radial elasticity can be achieved.
• the chamber 20 as a filling 46 with an elastic material at least partially, here completely filled.
• the filling 46 is preferably a soft plastic, which may have a porous or a closed structure.
• the filling 46 has a hardness in the range of 10 to 50 Shore A, wherein the hardness of the plastic may also vary, for example in the longitudinal direction or in the radial direction.
• the basic idea of an arrangement of an elastic material can also be applied to the embodiments illustrated in FIGS. 1 to 7, in particular to a plurality of chambers distributed in the circumferential direction.
• a production of a handle 10 for a screwdriver 11 with at least one chamber 46 provided with a filling 46 is possible, for example, as follows:
• the filling 46 is first applied to the Griffkem 13. This can in particular by spraying the filling 46 on the Griffkem 13.
• Handle core 13 in a shape with the outer contour of the filling made or by separate production of the filling 46 and arrangement of the filling 46 in the solid state on the handle core 13, wherein a frictional or positive connection, the filling 46 can secure relative to the handle core 13.
• the grip core 13 is inserted into a suitable mold with the filling 46 arranged thereon, and the grip jacket 18 is injected around the grip core 13 and the filling 46, thereby ensuring, in particular, a cohesive connection between the grip jacket 18 and the filling 46.
• the grip jacket 18 is sprayed onto the casting core using cores to form the chambers 20, as has already been explained above.
• the filling 46 is introduced into the at least one chamber 20.
• the filling 46 is injected into the chamber 20 in the form of a soft plastic.
• the filling 46 can extend only over a partial region of the at least one chamber 20.
• the filling 46 may be formed as centrally arranged with respect to the longitudinal extension of the handle 10, radially oriented web or circumferential collar. It is also conceivable to form a radial gap between the filling 46 and the gripping jacket 18, so that the gripping jacket 18 only after being predetermined by the gap height elastic deformation to rest against the Fill 46 comes.
• high rigidity in the circumferential direction contact surfaces between handle shell 10 and filling 46 may be formed larger in the circumferential direction than those in the radial direction, see.
• Fig. 4 Also conceivable is the use of a composite material for the filling 46, for example, the injection of soft plastic into the chambers 20, if in these already stiffening elements are arranged.
• FIG. 10-12 show a further embodiment of a handle according to the invention 10.
• the part of the handle core 13 having a cylindrical outer surface, which is surrounded by the grip shell 18, radially outwardly oriented webs 22.
• the lateral surface 19 is formed with end faces 47 of the webs 22 extending in the direction of the longitudinal axis 14-14 of the handle 10.
• the end areas 47 of the webs 22 assigned to the end areas 47 are connected to one another via transition areas 48, the transition areas 48 having a constant wall thickness which is smaller than the wall thickness of the webs 22.
• the transition areas are "pillow-like" and arcuately curved by the webs 22 outward.
• the chambers 20 are radially inwardly limited by the cylindrical surface of the handle core 13, in the circumferential direction of the webs 22 and radially outboard of the transition areas 48.
• the handle core 13 is integrally formed with the "cap", so that the handle core 13th roughly as in the cross section "double-T-shaped" or "bone-shaped” is to call.
• the arranged in the chambers 20 material can be injected into a suitable shape with an inner contour corresponding to the inner contour of the transition regions 48.
• the material for the transition areas 48 can be injected into a different shape with an inner contour corresponding to the outer contour of the transition areas 48.
• the material of the transition regions and preferably also of the webs 22 is stiffer than the material arranged in the chambers 20.
• the end faces 47 of the webs 22 do not extend over the entire longitudinal extent of the lateral surface 19. Rather, in a front region 49 and a rear region 50, the lateral surface 19 is circumferentially formed circumferentially with the material of the transitional regions 48 , The end faces 47 of the webs 22 extend over the region of the handle in which this has the largest diameter and on which the palm of a user mainly rests.
• the circular Bulges of the transition regions 48 in cross-section to the outside are formed pillow-like elevations, which largely continue in the direction of the longitudinal extent of the lateral surface 19 of the handle 10. The aforementioned pillow-like elevations are deformed radially inwardly upon application of manual forces.
• the handle cross-sectional contour may also be different than the hexagon contour shown in the example.
• it may also be a substantially round, four-edged, octagonal or oval contour.
• the arrangement of the chambers in the circumferential direction can then also be different than in the illustrated exemplary embodiments and be carried out in such a way that the desired radial elasticity is achieved.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Mechanically-Actuated Valves (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
• Materials For Medical Uses (AREA)

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• 2005
  • 2005-08-09 DE DE102005037504A patent/DE102005037504B3/de active Active
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  • 2005-12-23 WO PCT/EP2005/014003 patent/WO2006069759A1/fr active Application Filing
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  • 2005-12-23 AT AT05824451T patent/ATE432796T1/de not_active IP Right Cessation
  • 2005-12-23 EP EP05824451A patent/EP1827766B1/fr active Active
• 2007
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