DE10066092A1 - Writing utensil, comprises shaft, single-piece- push-button element, push-button section, base section, actuation rod section and actuation tooth for projecting radially from actuation rod section - Google Patents

Abstract

The writing utensil comprises a shaft (9) and a single-piece- push-button element (K,L,10). This element comprises a push-button section (L), a base section (K,50) and an actuation rod section (8) that extends, in the axial direction, from the base section. An actuation tooth (Z) projects radially from the actuation rod section and is located within the shaft that is deformable in the radial direction when the push-button element is actuated. The actuation tooth may be mounted on the actuation rod section and have a peripheral extension (z6,z2) and shape, that a centre plane (70) extends parallel to a central axis (100) of the push-button element and may also extend in an axial front section (z3,z1) and an axial rear end section (z7) of the actuation tooth.

Description

The Invention concerned deal with several (independent) Inventions relating to one-piece (one-piece) mechanisms of writing implements. The respectively independent claims characterize the technical field with regard to the preliminary Words of the respective independent Claims, so that so far referred to.

In the prior art is from the eP 388 632 B1 (Merz & Krell) is a two-part writing instrument "known", which has a one-piece pusher, which is made in one piece from a single material and having a one-piece shaft. The third part (the mine) is not mentioned separately. The pusher has no other mechanically moving parts, but only an elastically deflectable shift rod, which carries a shift tooth as a switching element, which cooperates with recesses as guide curves on the shaft. The essence of this design is to reach the two switching positions, the writing positions and the rest position (the axially advanced and axially retracted position) and to lock the writing instrument therein in respect of the mine respectively to detent. In order to improve the accuracy of the switching operations, there in the cited document is a so-called stand (local reference number 24 ) is provided, which allows the shift rod performs more accurate switching movements in the Entrastbewegung and the latching movement. The pusher is inserted on the shaft in its rear portion from above and is held non-rotatably by a separate guide in the shaft. This pusher has no moving part, but only the said elastically deflectable shift rod which is moved for the latching movement substantially in one plane and for the Ausrastbewegung substantially in a plane perpendicular thereto. The planes are defined in terms of boundary planes by a two-edge stand, which is arranged on the push rod there of the pusher. During the latching movement, the stator limits movement of the shift rod in the radially inward direction so that the shift tooth can not slide out of the shift groove (the control cam portion). In the return stroke, so the Entrastbewegung, the stator limits the circumferential or tangential rearward displacement of the shift tooth (pushing, releasing and moving back of the trigger), so that the shift tooth does not lock again in the intended for the writing position undercut, which he should actually leave.

Writing instruments according to said State of the art are extremely robust and inexpensive to manufacture. They are susceptible to interference of missing moving parts and allow due to the one-piece Mechanics and the shaft as such, in the sense of "two - piece writing instruments" (plus the Mine) highest numbers at the lowest possible Prices. The technical and economic development demands however, that prices future continue to be lowered and therefore simplifies manufacturing methods and cheaper have to be designed without affecting the reliability of the writing instruments. At best, this reliability even increase, at Use of inexpensive plastic materials and cheaper to use Manufacturing processes.

The technical problem of the invention is therefore a one-piece mechanism, in conjunction with a substantially one-piece shaft (at least in the back section) to create, in which the production is inexpensive, the reliability guaranteed and as few mountable parts as possible are used. Yet should - to Receipt of writing ability of the writing instrument - a mine change possible be, so the mechanics be dismantled so that the user of the writing instrument the Mine can replace, if it should be consumed once.

The independent claims give the solution to the aforementioned problem again (claim 1, claim 15, Claim 30).

On the one hand the inexpensive manufacturing process is achieved in that the one-piece Mechanism is realized by a single pusher part, the in a cheap manufacturing process with a cost-effective Tool can be made. It is easy from this tool demoldable, without complicated mold cavities (claim 20). The separation the for this part required mold halves is a single level, so that Injection molding tool "easy" to be kept can.

at Use of cheap plastics, which have little inherent elasticity and strong Being compliant is for it taken care that the Shift rod, at the rear end the switching element (in particular as a switching tooth) is arranged, in the writing position opposite The rest position undergoes no radial displacement, especially no tangential (or extensive) Displacement has (claim 30). On the other hand, an axial displacement of the pusher part used for switching purposes. The shift rod can do this way do not tire The stand required in the prior art can be omitted and still the reliability of the writing instrument can be ensured.

If there is no tangential (circumferential) deflection in the writing position relative to the rest position, no permanent elasticities or bending moments must be applied in the long term are taken, but the switching tooth is in both stable states, the first switching position and the second switching position (as writing position and rest position) in each case in the same circumferential or tangential position.

The same applies to the radial position, both inward and outward radial on the circumferential Cylinder shape of the shaft in the writing position from the rest position does not deviate. Again, you have to no permanent forces to maintain elasticity the shift rod are applied.

The writing implement stands out with regard to the pusher part on the one hand, on the other hand but also because of the shaft characterized in that the respective parts are formed are that the Shift tooth in the writing position opposite the rest position or vice versa experiences only an axial displacement and virtually no or at all no tangential (circumferential) Displacement and virtually no (or no) radial displacement. Independent of this is the movement between the two stationary positions, the rest position and writing position. Between these two movements are there the corresponding deflections in tangential (more extensive) and in the radial direction, or in each case only one of these two movement components, around the switching tooth from one stable position to the second stable one Position or vice versa.

Also The inexpensive production serves the design of the one-piece Shank, also as shank section, at least in that area, in which the two stable layers of the writing instrument, caused by the corresponding Rest positions of the switching element on the shift rod on the handle part lie. This area lies in the rear section of the shaft, especially in the last third to quarter of the shaft length of a today's writing instrument. In this shaft, which is preferably made of a metal, but also formed from a permanently deformable plastic can be, at least a small shaft segment is provided, the radial is deformed to set at least a portion of a cam (Claim 1, claim 10).

The Deformation happens opposite the shaft, ie radially inward or radially outward. It is preferably in the area below a clip, the one piece on handle is formed.

The Radial deformation occurs along a forming area, the can be designed as a forming line, bending line or bending line. Additional parts, Insert parts or attachments are not required (claim 31). The from the shaft material formed in the radial direction control segments (because of their origin Shank segments called) form those switching cam sections from, along those the switching element on the shift rod elastic is deflected, in the radial direction or circumferential (tangential) direction, depending on the time of movement or location of the trigger or switching state of the writing instrument (Claim 12).

by virtue of The deformation may be that at certain materials or certain geometries bending lines too Dividing lines, wherein the molded shaft segment a free Edge gets that separated from the shaft in radial (inwardly or outwardly) protrudes as a stop or guide for the Serve switching element (claim 3).

Prefers are those edges that over the Measure of Bending, buckling or deformation beyond a separation in the sense lead a punching, oriented there, where no longer sliding system of the mostly made of plastic switching element is provided to change the shape of the switching element To avoid abrasion. The conditions of the formation of burrs in forming or punching process are taken into account accordingly (claim 9).

Finally is associated with the invention, the problem, a mine change to achieve ease of handling. A mine change at one writing implement with one-piece mechanical part (handle part) and additionally a one-piece shaft portion in Schaltkurvenbereich the shaft is not easy to achieve after (turning, sliding or sliding) movable accessories on the handle were to be avoided. The one-piece handle part must therefore so taken in the shaft and guided be that despite the recordings and the guide a removal of this pusher part from the shaft and a renewed insertion at continue given Function possible is. This is achieved with the invention (claim 23) characterized the existence limited leader, the on the handle part between one stationary there arranged guide section and said shift rod is arranged due to a relative Rotational movement of the pusher part gives way elastically.

Its surface design makes it possible to turn the pusher part (or the shaft relative to the pusher part) circumferentially, wherein the elastically yielding guide piece of the pusher part gives way radially and is released from associated axial guide segments on the shaft. The pusher part can then be removed after the circumferential rotation - axially backwards - and the mine can be replaced. It is positive that the shift rod with the circumferential rotation of the influence of the Führungssegmen te comes out and the pusher part can be removed axially without catching the shift tooth from the shaft.

One renewed insertion of the pusher part again happens under the influence of elastic yielding of said guide piece on the pusher part, also in the radial Direction, although the forces required for insertion here be applied by an axial movement and the guide piece here to the axial guide segments aligned on the shaft.

The Solve the pushing part thus happens by a limited circumferential movement, while the renewed insertion of the pusher part in the lead done by an axial pressure component.

The The invention is explained in more detail below with reference to the figures of examples.

1 is a plan view of the upper portion of a shaft 9 whose upper edge 8th visible and its lower portion towards the other writing instrument is not shown here. As far as that goes 4 directed.

1a is a section in a plane perpendicular to the axis 99 of the shaft 9 from 1 , The section is created where the section line Ia in 1 indicates.

1b is a sectional view of the 1 at the in 1 Ib, wherein only that portion of the cylindrical shaft is shown, in the reshaped shaft segments A, B of 1 are provided.

1c is a sectional view in a plane parallel to the axis 99 at the height of segment B of 1 , as shown there with Ic.

1d is a cut in the same place as 1c , only here is an upper deformation line b1 provided as a parting line t, that of the remaining shaft 9 is separated.

2 is a side view of a pusher part 10 , this in 4 at the upper end of the shaft, partly above and partly below the upper edge 8th is provided. It is shown a side view from which the shift tooth Z and the pusher head L can be seen.

2a is a sectional view perpendicular to the axis 100 of the pusher, along the level IIa in 2 , Visible are the two vertically aligned mid-planes 97 . 98 of the pusher part 10 ,

2 B is a sectional view at the point IIb of 2 , Namely by the shift tooth Z on a shift rod S in a direction perpendicular to the axis 100 from 2 ,

3 is a view of the handle part 10 from 2 , wherein the shift rod S, the shift tooth Z and an elastically supported functional part C can be seen. The mine M, which is at the front end of the pusher part, is indicated 10 rests, supported by a spring, not shown in the front portion near the front opening of the writing instrument according to 4 ,

4 is a schematic side view of the writing instrument with a metal shaft provided here 9 , the rear part used 10 and one in the writing position forward emerging mine piece of the mine M. The shaft 9 rejuvenates in the area 9a to the opening for the mine.

5 is a representation of the used for explanation coordinates r, φ and z.

6 is a representation of the shift tooth Z of 2 or 1 , in a position between two mold halves H1, H2 during injection molding of the pusher part 10 ,

Starting from 4 in which a refill writing device is schematically illustrated, which may be a ballpoint pen, a rollerball or any other writing instrument with a shaft and a pusher part, are different functional sections of this writing instrument on the basis of 1 to 3 be explained. To overview serves the 4 , The rear handle part 10 has a pusher portion L and a body portion K. The body portion K is in the upper end of the shaft 9 used and kept axially movable therein. The axis 99 of the shaft 9 falls with the axle 100 of the pusher part 10 together.

This direction should be the axial direction, also denoted by z, oriented to cylindrical coordinates, as from 5 seen.

The front section of the shaft 9 is 9a , Here, the writing instrument is tapered and has a front outlet opening for moving out of the mine M in a writing position and for retrieving the mine in a rest position in which no mine piece exits the front. This corresponds to the position of the pusher part 10 in an advanced position (writing position) and an axially retracted position (retreat position). The shaft is elongated and has in its rear region a switching cam control and a guide for the pusher part, which will be explained in more detail in the other figures. It is understood that in the writing instrument a spring arrangement or at least one elastic arrangement is provided, which is a backward force on the pusher part 10 can apply, so that it is axially movable against this switching pressure and thereby have the mentioned switching curves their effect for locking and unlocking, especially in the movement from the rest position via intermediate positions in the writing position and when releasing from the writing position in the context of the return movement to the axial further back rest, where no mine is extended.

The illustrated shaft is made of metal. It can also be made of other materials, such as hard plastics or other permanently deformable materials. The pusher part 10 is made of any material, usually made of a plastic and is in the 2 and 3 explained in more detail. The drawn cam sections and cooperating with them toggle Z on a shift rod S of

2 . 3 result in the control of the switching device via pressure forces on the handle part 10 ,

To realize the switching curves, the cam sections are formed out of the shaft. The cams are in 1 seen. There, a first segment A is provided, which has three sections A1, A2 and A3. A second segment B has two sections B1, B2. These two segments are called stem segments below. Guide segments E and F are at the upper edge area near the upper edge 8th provided the writing instrument. Also, they are as small segments parts of the shaft, which have been deformed out of this.

The Segments A, B, E and F are made of the material (material) of the Shank formed, e.g. in a punching process or in a Bending process or in a stamping bending process in one operation. There is no waste and at the same time with the shaping The segments create the openings on the shaft, which is formed of a permanently deformable material is. The projecting in the radial direction or the protruding in the radial Direction relative to the rest Shank section creates ridges, lines or surfaces along which the addressed Shift tooth Z can slide to be deflected while and in corresponding guideways, Undercuts and deflections to arrive. These will be cam sections called.

When forming (forming, deforming or bending) of the segments A, B, E, F arise transition zones as transformation areas u, in which the radially deformed segment in the remaining and unformed shaft 9 leads over. These areas can have bending lines or creases, they can also have continuous curvatures, so that the radially directed deformation of the respective shaft segments takes place at least along this deformation area. This results in radially opposite the shaft projecting cam sections, which will be described later. They extend at least in the axial direction, of course, in the radial direction and at suitable locations in the tangential or circumferential direction, for the deflection of the switching tooth in its axial stroke.

This is to set that the cylindrical coordinates are used to describe the switching operations. It is understood that the three-dimensional movement of a switching tooth during the switching movement is not always and uniquely done only in cylindrical coordinates, but performs combination movements, which consist of at least two or all three components of a cylindrical coordinate system, what 5 is apparent. The axial direction is z. The radial direction (perpendicular to the axial direction) is r, both inward and outward. The circumferential direction is φ. Upon actuation of the switching tooth on which can be turned off during the switching movement, there are also mixed movements of the three components, such as a tangential movement, which is a composition of r and φ component. In the course of the description, the tangential and the circumferential movement are usually referred to the same way, since the tangential movement distance is usually short and therefore extends in the first approximation circumferentially.

It But it can also be that that writing implement at the location of the shank on which the cam sections are arranged are flattened, so that the along this area extending movement of the switching tooth (perpendicular to the z-direction) a Combination of r and φ components is.

The radial deformation of the shaft segments ensures that the segments A1, A2, A3 and B1 and B2 as control segments for the shift tooth are formed of the same material as the shaft. The mechanical machining and bring the shaft as the starting object that with itself.

There are formed on two axially spaced shaft segments a plurality of curve sections which cooperate at different times with the switching tooth Z. To distinguish this from the function to see differently, axially farther away shaft sections D and E near the top 8th of the shank, which are assigned a guiding function, along a bridge section 40 of the pusher part which is in 2 and in

3 is shown. Here are no distracting influences on the shift tooth, but an axially oriented leadership of the pusher part in a way that should lock him against a stronger circumferential movement. Nevertheless, these shank sections D and E are also formed of the same material as the shaft 9 , Here you are above the switching curves, between the normal rest position of the shift tooth Z and the upper end 8th of the shaft 9 , The entire section between the top edge 8th and the lower end of the switching curves is less than a third, in particular less than a quarter of the length of the shaft 9 ,

The Formation of the shaft segments for forming switching curves or at least switching cam sections requires a reshaping of segments of the shaft. The shaft must therefore be sufficiently plastically deformable, at least in the sections, which are formed. The so far suitable for deep drawing shank is preferably metal and the working method is preferred a punch-bending process. When punching burrs are created, namely on the side facing the stamp. In the embodiment the deformation is made radially inward, ie by a inside counter-punch or a die and an externally acting Stamp, which deforms a small portion of the shaft radially inwardly and thus creates a burr, which in a partial separation of the radially inward deformed segment on the stamp side facing the segment lies. Can the separation with a high Tiefziehheignung of the shaft material, So a high yield point can be avoided, arise at all no burrs and all Indentations are provided with rounded edges or lines, to the leadership of the shift tooth Z are suitable without it during the movement worn or damaged becomes.

In most cases, however, it can not be avoided that one or the other line of the forming becomes a dividing line t, as in FIG 1d shown. Even before the dividing line t is created, a bending line b1 can be seen which does not contain a separation of the forming area u. Shown here is the second shaft segment B from the sections B1 and B2, as in 1 shown. The separated in the example lines b1 and b3 in 1d is a kinked extending Linienzug, which is only partially required for the axial operation of the shift tooth Z to the switching process, so that the dividing line t is harmless at least at the point b1 for the switching process and for obtaining the shape and function of the switching tooth Z. With respect to the line b3 but there is the possibility that the switching tooth rests touching it during the movement, in the course of the return movement of the writing position in the rest position, so that here wear can occur, and should be taken in the transformation that this Line b3 is not provided with a burr, so that the training according to 1c preferred here.

Corresponding are all closer in the further explained Edge lines of the molded segments designed so that they, when the toggle is over them a longer one Route sliding with pressure applied, if possible not as a dividing line t are formed, but as a bending line b1, without training a Burrs when forming out of the shaft.

The following is based on the 1 and the associated sectional views in the 1a . 1b and 1c (mutatis mutandis equivalent to the 1d ) are explained how the radially deformed segments interact with the switching tooth Z. For this, first of all, the switching process as such must be considered, which allows an overview of the movement of the switching tooth.

The switching movement begins in the rest position where the shift tooth Z in the median plane (through the axis 99 ) is located. The switching tooth Z has a plurality of abutment edges or face pieces z _x (x = 1,2,... 7), which give a certain, in the drawing closer apparent geometry, which gives the shift tooth Z a greater extent in the longitudinal direction, as in tangential or circumferential direction. In essence, the shift tooth can be described as elongated oval, wherein the abutment surfaces always have pieces of planes, so that a non-symmetrical polygon is formed in the lateral cross section.

Starting from the initial position, which is the rest position, in which the mine M does not protrude from the writing instrument and the elastic spring in the writing instrument has its maximum relief, the switching tooth moves upon actuation of the pusher 10 axially forward until the first abutment surface z1 coincides with the forming line a3. The switching tooth Z is deflected circumferentially after the pusher is guided as such in the segments D and E and does not experience a rotational movement in the shaft.

In a further axial advancement of the shift tooth Z reaches the end of the oblique line a3 and falls in the circumferential direction in the direction of the second segment A2. But he does not reach this segment, but previously touched in a not shown position with its stop surface z1, the control line b1 of the second segment B, and its front portion B1. The switching tooth is thus held further on the left side of the median plane and does not yet fall into the working position in the interior of the v-shaped first segment A, which defines the writing position. This is useful after a user does not leave the Act at the point of leaving a3, but the pusher is usually pressed axially completely so that the line b1 and also the continuation b2 of this line b1 are still involved in the actuation, in each case based on the abutment surface z1 of the tooth Z. Both line sections b1, b2 and b1, b3 run broken.

First when you release the trigger the tooth slides backwards along the dashed path and falls - controlled from the line b1 - in the downwardly open v of the line a1 and formed as an inclined surface Segment A2. Here is the second stationary location or writing position. The tooth Z is opposite the initial position, the rest position, neither deflected radially nor tangentially, so it is in practically accurate same position, with the exception of an axial displacement. The shift rod S does not need any powers here to apply, neither in the withdrawal position, still in the writing position. The switching tooth is in both cases within the middle plane.

In the temporal actuating portion of the return movement, this begins with a forward thrust in the axial direction z. The user presses the pusher section L again and the shift tooth Z moves on a radially upper stop surface z5 (visible 2 B ) along the plane A2 of the first molded shaft segment. As a result, the switching tooth receives a radially inwardly directed component of motion, caused by the guide surface z3 and the stop line b3 on the second segment B, or its first portion B1. He moves along the dashed line drawn circumferentially further to the right, while a radially inward movement.

After leaving the segment A2, the stop surface z7 receives its task in the return and slides along the beginning of the line a2, which should be formed as Umformlinie u, but also a dividing line t according to 1d can be. The shift tooth can be further deflected to the right and moves along the dashed line drawn, touching the stop surface z6 and the axially extending cam portion a2, back to its original position. This is circumferentially significantly shifted from the return line a2.

The first segment A with the three sections A1, A2 and A3 is essentially V-shaped with his mouth aligned downwards (towards the writing tip). The second segment B1, B2, overall B, is approximately triangular in its first section B1. Both segments lie both on this side and beyond the middle plane, being the triangular Align the second segment with its first section B1 in Direction of the opening of the V-shaped first segment shows.

The second segment B may additionally have a holding portion B2 which is formed obliquely inwardly, as shown 1c seen. This is followed by the substantially circumferentially aligned first segment B1, either delimited by a deformation line b1 according to FIG 1c or a dividing line t according to 1d ,

The second segment B is formed deeper, resulting in 1b evident. There, an axial view according to section Ib is shown. Visible is the one arm A3 of the first segment A and extending as an inclined surface A2 indentation of the second arm A2, A3 of the first segment A. Directly behind the deeper molded second segment with its first portion B1 can be seen, the front tip b4 as the end of can be seen triangular shape, the kinked front b4 the two control sections b1 and b3 separates. These sections are in a formation as parting line t to stop lines, cooperating with the two control surfaces z1 and z3 of the shift tooth Z at the front end.

Out 1b can be seen which areas are provided as Umformlinien u. Also visible is the initial oblique control line a3 at section A3 of the first segment A.

The stop line a1 is not a sliding edge, but only one, on which the switching tooth Z rests to reach the writing position with control surface z7. It can be executed as a dividing line t without further. The beginning of the slope A2 is executed in any case as Umformlinie u, after the shift tooth here has to slide sliding in the radial direction. Favorable for this movement is the formation of the switching tooth at its upper end with two slopes to advantage, which made 2 B evident. The two oblique sections z5 and z4 drawn there work in the example shown with the inner surface of the shaft 9 together, so at the beginning of the axial downward movement along the line a3, wherein the roof surface z4 as a wider area also applies a radial component of movement to the switching tooth, while it is deflected circumferentially or tangentially.

It follows that the moduli of elasticity of the two components of movement for the shift rod S should be different. The tangential stiffness should be weaker than the radial one. Nevertheless, there should be a radial compliance to be able to obtain the movement along the control line a3 and along the A2 button. It can not be avoided that a tangential (circumferential) deflection of the switching tooth and a radial component is applied by the formation of the cylindrical in this section shaped shaft. Should the Shank be formed here completely flat, so with an extending on the cylindrical portion, molded flat portion, the training z4 would be omitted after the switching tooth Z would then perform only a planar movement for movement along a3, but in the component representation of a circumferential and a radial component is composed, although no actual radial Abtauchbewegung enters this section.

The Position of the switching tooth Z in the writing position and in the rest position had already been addressed. It is set so that the shift rod S in the writing position relative to the rest position neither radially nor tangentially significantly deflected. So she can not tire and they are not additional measures necessary to secure the shift rod to the shift tooth one exactly give given switching path. Such safeguards are the initially described "stand" on the thrust K of the Pushing part, the border planes for determines the shift rod movement. Due to the lack of elastic deflection in the retreat position and the writing position do not need increased elasticity modules or find expensive plastics application, but also can inexpensive plastics are used without additional control measures for the switching accuracy. Both measures cheapen the pusher part, that's because of his one-piece education (out of one piece or one piece) anyway reasonably priced in an injection molding process can be manufactured, in addition no mechanically moving parts has, except the elastically bendable rod, which in this sense not as movable part is considered, but as elastically deflectable Control with said shift tooth Z at its rear end.

The shaft segments E and D were already described at the beginning. They too are made of the same material as the shaft 9 , They are in 1a where its geometric shape can also be seen in section along the plane Ia. This in 1 left shaft segment D has an inner stop line or stop surface d1, which according to the 1c or 1d may be formed as a deformation line u or as a parting line t. The adjacently arranged shaft segment E is designed differently. It contains a ramp e1 and has two forming regions u, at best none of which is a dividing line t. The ramp e1 should have no dividing line t.

These two formations work together with an in 2 apparent mechanism, which there are an elastically resilient latching element C and an elastic or hardly yielding guide element F. These two sections are in the supervision of 3 illustrated illustrated. Between these two sections F and C is a gap 45 provided so that the locking part C at two angles α at an angle extending webs 42a . 42b elastically yielding to the body K, caused by radial forces, while the guide portion F with its web 40 unyielding to the body K is.

When inserted, the pusher with all elements to the right of the gap 45 and still a little to the left of this gap in the shaft 9 below the edge 8th of the

1 , Presented in such an inserted position, the elastically resilient latching element C is located with a guide web 41 , which is an extension of the relentless guide bridge 40 is between the two indentations D and E according to 1a , On the one hand so that a circumferential lock for axial guidance is given at axial actuation forces, on the other hand, by the elastic compliance of the two webs 42a . 42b the guide bar 41 from the inclined surface e1 of the shaft during rotation of the pusher part 10 be moved radially inward relative to the shaft. The part 10 can therefore due to its surface structure with the web 41 are released from an axially guided seat by a rotary motion, but at the same time axially guided in the inserted position, for the normal actuation movements of the pusher 10 ,

It should be noted that a preferred direction can be specified, for. B. by the described inclined surface e1 and a correspondingly formed ramp 41a on one side of the jetty 41 of the resilient resilient latching element C. This unbalance is in 2a as well as in 3 , 2a is a section along the plane IIa of 2 and shows that the left-facing bevel 41a with the in 1 right-hand inclined surface e1 cooperates, to facilitate the application of radially inwardly directed forces on the locking element C, with a circumferential rotation of the pusher by a small angular extent.

A corresponding design of the free coming by a circumferential rotation can by changing the inclined surfaces, by forming only one inclined surface e1 or 41a be made. It can also be provided so that a double-sided oblique surface is present in order to design also the surface d1, which initially formed only a stop and guide line, as a free-decompression ramp according to the plane e1. The adjustments in the 2a and 1a The expert in the given descriptions can imagine, in the sense of one-sided Begüns solution (in one or the other circumferential direction) or in the sense of a bilateral favored solution.

It is advantageous if the user is given a left movement (when watching the writing instrument from behind), because he is accustomed to solve screwing connections by a left movement, so that in the 1 shown free direction by the slope e1 is the one that is ergonomically favorable. But this does not rule out that the other described free directions are possible.

In principle, a resignation (insertion) is also part of a release (removal), because the trigger part 10 is a reusable part, even if the mine has been replaced after a release and removal of the trigger. For this purpose, the pusher part is inserted in the axial direction.

When inserting a radially directed force is applied to the elastically resilient latching element C by the axial movement. This acts on the front bridge 43 over its front edge 43v as such, the web should be substantially round in shape to conform to the shape of the cylindrical writing stem. First, the edge beats 8th and then the axially free edges of the segments E, D at the edge 43v at. By an axial pressure component, the elastically resilient latching element C is pressed in the radial direction downwards (inside) and gives the edge 43v from the rear end edges of the segments E, D free, so that a locking and engagement of the guide segments D and E on the guide web 41 the elastically supported locking element C is possible. Another axial actuation causes the web 40 of the unyielding guide part F is received between the shaft segments D and E, in which case the elastically yielding part C is released from these segments E, D and lies in front of them.

web 40 and footbridge 41 are aligned, but have as a "surface structure" but a different-looking basis.

Thus, another function is described, namely the impossibility of the peripheral free coming of the pusher in the writing position. If the pusher is moved forward, the writing instrument is in writing position; Such is the intransigence of the bridge 40 responsible for the fact that it can not be circumferentially moved and removed relative to the inner stop surfaces e1 and d1 of the guide segments D and E of the shaft. This can be prevented that a user in the writing position, the release of the pusher tries and thereby damage the shift rod S or the shift tooth Z, which is in this position with the control cams of the shaft segments A, B in engagement.

The writing implement So can with regard to the pusher in the retreat position through a comprehensive Movement on the pusher and overcoming solved a resting point become. It can then be used again axially and will peripherally guided by the shank segments D and E. Finally, there is a lock on the handle part present, do not unscrew it from the shaft in the writing position to be able to so as not to damage the shift rod.

In the most favorable case, the angle β of the surface e1 becomes the ramp 41a customized. In the production of the one-piece part of 2 and 3 sits down the ramp 41a as a ramp 40a even with the relentless jetty 40 in the fixed guide section F of the pusher continued. This favors the demolding, but is not critical to the function, because the unyielding leader F with its not or only slightly compliant ridge 40 does not give so far that it compared to the radial Einwärtsmaß the surface e1 of 1a can be released by a radial movement.

The gap 45 , which was stated above, is favorable for the radial insertion movement in the selected inclined webs 42a and 42b , This movement has due to the training of the 2 Also, an axial component of motion for the elastically compliant element result. The gap 45 should therefore be chosen wide enough to accommodate the radial insertion movement of the locking element C, based on the radial Einformtiefe the shaft segments D and E.

Is in a suitable location to the left of the gap 45 according to 2 arranged a visible arrow, so the user can be pre-recorded the direction of movement for releasing the pusher part, as from 3 seen. The there drawn kink arrow is in the writing position of the pusher 10 not visible. Only in the resting position, he is outside the edge line 8th of the shaft 9 visible and shows the user that now by a rotary movement to the left and a rearward axial pulling out the pusher to the mine change from the shaft 9 can be taken out.

The pusher part of 2 has been described as such, with a pusher portion L, a body portion K and the fixed guide portion F and the elastically resilient latching element C. The other elements of the shift rod S and the shift tooth Z were also already mentioned. Your arrangement at a front their section 50 in the sense of a stop web for the mine M according to 3 was not mentioned yet. Mentioned was, however, the radially stronger rigidity of the shift rod S, according to 2 by a radially increasing shift rod S in the direction of the attachment web 50 is reached. The shift rod thus receives a greater width in the sense of a greater depth, wherein only the shift tooth Z, which requires a radial movement component, at the outer end of the shift rod Z can perform a circumferential (tangential) and a radial movement component readily controlled by the cam sections of 1 , The bridge so described 50 has a flattening 50a which is aligned so that it can be guided past the guide webs D and E and the other shaft segments A and B, without touching them. It lies in the mounted state of the writing instrument in front of the foremost shaft segment B and forms the Schaltstangenfuß and with its vertically angled end of the stop surface for the mine M, as from 3 seen.

• (a) Einmal muß eine Führung gewährleistet sein, so daß das Drückerteil nicht umfänglich beweglich ist, während die Schaltstange Z von der Axialbewegung gesteuert durch die Steuerkurvenabschnitte des Schaftes umfänglich, tangential und/oder radial ausgelenkt wird.
• (b) Das Drückerteil besitzt auch die Einsatzfunktion durch das elastisch nachgiebige Rastelement zwischen dem feststehenden Führungsabschnitt und der Schaltstange S.
• (c) Das Drückerteil besitzt außerdem die Schaltstange mit dem Schaltzahn, wobei die Schaltstange als solches ohne Zusatzelemente funktionsgenau arbeiten soll. Das Drückerteil muß also auch insoweit kostengünstig hergestellt werden, bei hoher Präzision und genauer Schaltfähigkeit, was fordert, daß die Schaltstange S auch bei preisgünstigem Kunststoff nicht ermüden darf.
• (d) Schließlich muß das Drückerteil eine Geometrie des Schaltzahnes besitzen, die aus einem Werkzeug leicht entformt werden kann, welche Entformung aber nicht nur für den Schaltzahn als solches gilt, sondern auch für den übrigen Bereich des Drückerteils, das neben den vorgenannten Forderungen auch preiswert hinsichtlich der Werkzeugtechnik hergestellt werden soll, also insbesondere leicht entformbar sein soll.

The pusher part 10 , which is authoritative carrier with respect to all the functions of the writing instrument, has several functional sections that realize different functions.

• (A) Once a guide must be ensured so that the pusher member is not circumferentially movable, while the shift rod Z controlled by the axial movement by the cam portions of the shaft circumferentially, tangentially and / or radially deflected.
• (b) The pusher member also has the inserting function by the elastically yielding pawl member between the fixed guide portion and the shift rod S.
• (C) The pusher also has the shift rod with the shift tooth, the shift rod as such should operate without additional elements functionally accurate. The pusher must therefore also be produced inexpensively so far, with high precision and precise switching capability, which requires that the shift rod S must not tire even at low-priced plastic.
• (D) Finally, the pusher part must have a geometry of the switching tooth, which can be easily demolded from a tool, which demolding but not only for the shift tooth as such, but also for the rest of the pusher, which in addition to the above requirements also inexpensive should be made in terms of tool technology, so in particular should be easy to demold.

this multi-layered problem areas contributes at several functional sections that are spaced apart, precision exactly finished handle part Bill. It has an elastically yielding snap zone, it has one In contrast, non-elastically yielding guide section. It has one of both axially spaced shift rod section, which is deflected in the rest position of the shift tooth as also in the writing position of the writing instrument, so that no forces must be applied, neither in a long-term rest position, possibly in the other long-term writing position. The intermediate positions between these both positions are in contrast uncritical, because they are only passed through briefly, without long-term remain in it and the shift rod so far long-term mechanical to claim. After all demolding is an essential criterion of the low-priced Production and here it is provided that the position and design of the switching tooth so chosen is that one simple injection molding tool can be used.

This tool is in 6 drawn separately. It is designed with respect to the mold cavities that it is the negative of in 3 and 2 has shown switching tooth in this area, as well as in the other areas of the pusher. This can be easily illustrated by the inside picture of the two figures in 6 is pictorially presented only in detail, without being explicitly shown otherwise.

The tool is as a first and second mold half H1, H2 usual nature, only in terms of the separation plane T or 70 there is a special feature between the two mold halves. Here, the mold separation is provided so that the two mold halves form a single plane and the shift tooth Z is arranged in this plane T, that the maximum cross-section 71 lies in this plane. The maximum cross section is the one through which this plane passes 70 runs. In this plane is also the main axis 100 of the pusher part, with the axis 99 of the 1 coincides.

Just because the tooth as such is formed asymmetrically with the plurality of polygonal abutment surfaces z _x , but still has an elongated oriented shape, a maximum cross-sectional area can be set. At this cross-sectional area, the dividing plane of the two mold halves, which form this switching tooth extends. In addition, the shift rod S is also provided, which is so formed and is arranged in the mold with closed mold halves that it is either centered or more to the left or more to the right with respect to the mold parting plane T aligned. The boundary layers are such that the switching rod hypothetically touches the parting plane, ie in its width s _{q is arranged} either entirely in the left half of the form or in the right half of the form, but at these boundary layers so perpendicular to the plane T extends that in the area the shift rod none of the forms has a raised area or additional pieces are needed as inserts. In most cases, a partial width S 'in the first mold half H1 and a second partial width S "in the second mold half H2 will lie in corresponding cavities.

in the Range of the shift tooth was also designed that no projection on the mold separation provided is. The shift rod and the shift tooth are thus in one area the closed shape, the dividing plane of the two mold halves at least touched. This allows easy mold separation and cost-effective production of the pusher part be achieved.

Claims (29)

Shaft for a writing instrument, which shaft is made of a permanently deformable material, for receiving a lever which is displaced far backwards from the front end of the shaft (write end) ( 10 ), whereby on the shaft ( 9 ) a plurality of cam sections (a3, b1, b3, a2, A2) are provided, for cooperation with a switching element (S, Z) of the pusher ( 10 ) and for achieving a first switching position (writing position) located at a first axial position and a second switching position (rest position) located at a second axial point which is set back, characterized in that the control cam portions (a) are formed from the same material as a axial portion of the shaft ( 9 ), in which the two axial switching positions are located; (b) are formed by at least one shank segment (A; A1, A2, A3, B, B1, B2) deformed in the radial direction by deformation force, which at a first segment section has a deformation region (u), such as a bending line or kink line deformed radially inwards , wherein the reshaping of the shaft segment takes place at least along the deformation region, for the formation of a radially opposite the shaft ( 9 ) protruding cam portion extending at least in the axial direction. Shaft according to claim 1, wherein at least two shaft segments (A; B) are provided. Shaft according to claim 1, wherein on the at least one reshaped shaft segment (A; B) the radial deformation results in a parting line (t) as a second section, along which an at least regional separation of the radially deformed segment from the remaining shaft (A). 9 ), for clearing or exposing the second section. Shaft according to claim 1, wherein at least two shaft segments (A; B) radially deformed to form cam sections and axially offset from each other on the shaft are arranged. Shaft according to claim 1, wherein at least one forming area (U) in particular a forming line (b1, b3) kinked or curved. Shaft according to claim 1, wherein the material is metal is. Shaft according to claim 1, wherein the at least one Shank portion (A; B) in its radial deformation (u) by application a deep drawing process, in particular in connection with claim 3 as a punch bending process to form at least one bend line (u) and at least one dividing line (t) arise. Shaft according to claim 1, wherein the rear portion the last third, especially the last quarter of the length of the Shaft is. Shaft according to claim 1 or 3, wherein at least one deformation region (u) serves as a control curve section (a3) for the switching element (S, Z) along which a sliding of the switching tooth during an axial actuation of the pusher ( 10 ) takes place, in particular at least one dividing line (t) of a shaft segment (A, B) is arranged and aligned so that it is not touched by the switching tooth (Z) in an axial actuation of the pusher (b1) or only as a plant - without significant Relative movement between switching tooth and separating line - serves for the tooth (a1). Shaft section having a substantially tubular geometry with substantial axial extension, for use in the manufacture of a writing instrument in conjunction with a pusher with an elastically deflectable switching rod and a switching tooth (Z) arranged thereon, wherein - at least one segment (A, B, C, D) of the shaft section ( 9 ) is radially deformed, for forming at least a portion of a control cam for the shift tooth (Z) on the shift rod of the one-piece pusher ( 10 ); - The at least one segment (A, B, D, E) the same material as the shank portion ( 9 ) having; - The radial deformation of the segment relative to the shaft portion along at least one forming area (u) is provided or has occurred. Shank portion according to one of the preceding claims, wherein at least two radially deformed segments (A, A2, A3, B, B1) are provided and one of these segments (B1) has a greater radial extent of the rest Has dimension of the shaft portion, starting from the other segment (A3, A2). Shank portion) according to claim 1 or the independent claim 10, wherein at least one segment has an inclined surface (e1, A2), the extends in the axial, circumferential and radial direction of the shaft portion, for displacement of the switching tooth (Z) by at least one radially directed component in a switching movement, caused by an axial movement of the pusher. Shank portion according to claim 10, wherein the forming area (u) is a kink or bend line. Shaft portion according to claim 11, wherein the radial Extension a greater depth towards the interior of the shaft portion. Writing instrument with a shaft ( 9 ), in particular according to one of the preceding claims, and an in particular formed from one piece pusher part (K, L; 10 ), which has a pusher section (L), a body section (K, 50 ), and a shift rod portion (S) extending axially from the body portion and having a shift tooth (Z) radially projecting thereon, which shift tooth (Z): (a) is formed by at least one small radial segment (A, B) of the Shank ( 9 ) upon actuation of the pusher part ( 10 ) in the shaft ( 9 ) is displaced, in particular in the circumferential, tangential and / or radial direction; or (b) has two axially spaced stable plies corresponding to the writing position and the retracting position of the writing instrument, the switch tooth (Z) occupying the same at least circumferential (tangential) position in both plies, displacing only axially; or (c) has such an arrangement on the shift rod portion and such a circumferential (tangential) extent (z6, z2) and design that a midplane ( 70 ) parallel to a central axis ( 100 ) of the pusher part extends, both at an axially front (z3, z1), as well as at an axially rear end portion (z7) of the shift tooth (Z) extends in the shift tooth. Shaft according to claim 1, 10 or 15, wherein the deformation is radially inwardly towards the center (the axis) of the shank ( 9 ) is done. writing implement according to claim 15, wherein the switching tooth (Z) in the inserted state in the shank against an inner wall of the shank to cam sections at the at least one shaped shaft segment (A, B) so accurate as possible nachzufahren. writing implement according to claim 17, wherein the abutment against the inner wall by a at least one-sided slope (z4, z5) of the surface of the switching tooth takes place, also along a radial direction inclined surface (A2) to slide along and pressed there to become. writing implement according to claim 17, wherein the inserted switching tooth (Z) has a low receives radial preload. Pusher for insertion into a shaft according to claim 1 or claim 10, having a body portion (K, 50 ), an at least axially extending shift rod (S) and disposed thereon, via the shift rod (S) elastically deflectable from its rest position switching tooth (Z) which protrudes radially from the shift rod, wherein the shift tooth (Z) - extending in the axial direction - has several cross-sectional areas, which have a different area, and the cross-sectional area with the maximum area ( 71 ) a level ( 70 ) defined in the manufacture of the pusher between two mold halves (H1, H2) in a plastic injection molding process is the parting plane (T) of the mold halves or comes to lie directly in this parting plane. handle according to claim 20, wherein the pusher part out of one piece or in one piece from a coherent one Plastic by injection molding is made. A pusher according to claim 20, wherein the shift rod (S) has an axial length and a circumferential (tangential) width and connects to the shift tooth (Z) such that an extension of the shift rod perpendicular to the plane ( 70 ) of the maximum cross-sectional area and with respect to the maximum cross-sectional area ( 71 ) of the switching tooth (Z) - which corresponds to the parting plane (T) of the mold halves during demoulding - on one or the other side of the surfaces ( 71 ; T) corresponds at most to the width (sq) of the shift rod. painted to painted Pusher for insertion into a shaft according to claim 1 or claim 10, having a body portion (K, 50 ), an at least axially extending shift rod (S) and arranged thereon, via the shift rod (S) elastically deflectable from its rest position switching tooth (Z) which projects radially from the shift rod, wherein the deflectable from its rest position switching tooth (Z) at Inserting the pusher in the shaft has two stationary layers, a rearward position as the rest position of the writing instrument and an axially advanced position as writing position of the writing instrument, and the two positions of the switching tooth (Z) in tangential (circumferential) direction do not differ from each other. A pusher according to claim 30, wherein in the area the shift rod, along the axial extent, on the body part (K) no solid support means is arranged, which allows in the region of the radial or tangential movement of the shift rod engagement by touching to control the switching accuracy. Pusher according to claim 30, wherein the switching tooth (Z) on the switching rod (S) in the rest position when not inserted into the shaft substantially in a median plane ( 97 ), which median plane through a major axis ( 100 ) of the pusher part and by the shift rod (S) extends at least touching. handle according to claim 30, wherein the shift rod (S) has an elasticity or compliance in the radial direction and in the tangential (circumferential) direction and (a) the elasticity in the radial direction is less than that in tangential Direction; or (b) the compliance in the radial direction opposite the Compliance in the tangential direction is less. handle according to claim 30, wherein the two layers of the switching tooth (Z) neither in the radial direction still in a tangential (circumferential) direction from each other differ.