DE3032200C2 - Filling pencil with automatic lead advance when writing - Google Patents

Description

The invention relates to a filling pencil with an automatic lead advance when writing the preamble of claim 1.

Such a filler pencil is known, for example, from US Pat. No. 3,424,535. The disadvantage of this was known ten filler pencil is in particular that it It is necessary here to create a relatively complex clamping system which, in addition to several interacting clamping elements, has a plurality of rolling bodies, so that this results in addition to one

6ö particularly susceptible to failure also an extremely expensive one Writing instrument results.

Due to the multi-part clamping mechanism is it does not always guarantee that the respective follow-up lead is automatically inserted into the clamping system or is initially reliably detected by this.

From US-PS 38 64 046 a filling pencil has become known, the axially movable mine protection tube is also acted upon by a spring

is supported on a clamping device on another clamping device, equipped with special pressure elements, acts.

But since here in particular the clamping elements of the first clamping device exclusively due to special clamping parts on the second clamping device to take effect at the mine is mainly due to de; the high friction required for this a safe functional sequence both when clamping the Mine, even when it is released for automatic feed, is not guaranteed

In addition, the two clamping devices disclosed here are again relatively complex Parts represent, so that a lead pencil formed according to this prior art is relatively expensive and is also prone to failure. Furthermore, this is particularly due to the practically indirect effect Clamping the firm hold of the lead when writing is not guaranteed, as this is intended for this Clamp tube of the first clamping device via a ji relatively long axial area is brought into effect, so that the mine may be with increased writing pressure through this clamping device slips and not for writing without renewed full advance is more usable.

From DE-OS 26 11 608 it is also already been known in filling pencils, the axially movable lead guide tube by a compression spring is acted upon, in addition to execute the clamping device axially spring-loaded and by means of rolling bodies to bring to effect.

Here, too, it is necessary to have an extremely complicated construction, both for the mine protection tube as well as the clamping device to cause a conditionally automatic lead advance. It is also absolutely necessary to use a push button for tracking the follow-up mine to operate, otherwise the clamping device will not be opened sufficiently to automatically release the new mine to introduce.

The object of the present invention is>; s, a simply constructed, particularly inexpensive and easy to maintain, consisting of a few individual parts To create a filling pencil, the lead of which automatically tracks itself in line with its wear and tear when writing and the respective subsequent mines are updated automatically.

According to the invention, this object is achieved by the objective features of the characterizing part of claim 1 solved.

Preferred exemplary embodiments of the invention and structurally advantageous features are set out in the subclaims highlighted and are explained in more detail below with the help of the drawing. Here shows

Fig. 1 - an embodiment with optional push-button actuation,

F i g. 2 - an embodiment without a push button, Fig. 3 - a sectional view along the line IH-III in Fig. 2,

F i g. 4 - an enlarged partial view of a further embodiment,

Fig. 5 is an enlarged partial view of the embodiment according to FIG. 2,

F i g. 6 - an enlarged view of the lead guide tube and FIG

Fig. 7 - also an enlarged version of the lead guide tube in an alternative design to F i eb

F i g. 8 - a variant of the K.iCiTi-r.vorr.chif.-vg.
The embodiment shown in Fig. 1 represents a filler pencil 1, the lead guide tube 2 of which is axially arranged in a removable shaft tip 31 of a housing 3 and has an extension 21, in the extension of which a spring element 63 is formed in one piece axially into the Interior of the pen extends into it.
The rear end 64 of the spring element 63 comes to rest against the conically inwardly tapering support zone 44 of the front end 41 of a clamping device 4. Due to the weak axial and especially radial pressure constantly acting on the front end 41 of the clamping device 4, even in the rest position, the clamping device 4, which is designed as a pressure-less or springless, is pressed radially so that it can also be in the area of the smallest diameter of a bore 48, which is here effort not shown for clarity; (5) completely releases or fails

If, however, a clamping device is selected with natural spring acting radially outwards, this can be done Spring element 63 (or 6) can also be so short that it is not in the rest position of the pin on the Clamping device 4 is applied, but only when writing or at the beginning of the feed movement applied to the front end

About the rolling body 47, which is axially at a conical inner bore 73 of the front end 71 movable sliding bush 77 rest, the particularly easy mobility and self-locking Storage of the clamping device 4 within the sliding bush 77 causes. The sliding bush 77 is here especially therefore arranged axially movable within the housing 3 so that any existing Diameter differences that occur during the manufacture of the clamping device 4, the conical inner bore 73, as well as the rolling body 47 can occur, automatically compensate in the simplest way.

De; beyond this mobility serves the manual feed actuation via a cap 9, the front end 81 of a mine supply tube 85 partially pushes into the rear end 72 of the sliding bush 77, which is radially resilient by means of slots, and this moves axially back and forth due to static friction.

The movement is limited by a collar 78 which strikes, for example, on the end face of the main part 33 and on a stop surface 34 within the shaft tip 31 of the housing 3. The axial sliding paths of the sliding bush 77, the clamping device 4 and the mine supply tube 85 are dimensioned and coordinated in such a way that when the mine supply tube 85 moves downwards, the sliding bush 77 is first acted upon by the latter and indirectly entrained by the clamping device 4, the mine 5 and possibly of the mine guide tube 2 is moved towards the pen tip and that the clamping device 4 only when the sliding bush 77 has reached the ι insehlagfläche 34, is also directly acted upon by the front end 81 of the mine tube 85 and forcibly carried along, whereby it opens and the Mine 5 releases. When released, the dome 9 and sliding back of the refill tube ui * "ird in reverse order vnn the Federeiement ö 63 or the first Klemnvoirichtung 4, and then the sliding bush 77 to the rear bewegi. When the rest position is reached, the clamping device 4 initially remains open, while the additional pressure when writing over the

conical inner bore 73 and the rolling elements 47 closes and holds the mine.

The lead tube 2 is in the rest position with the front of the projection 21 at the bottom of the enlarged bore inside the shaft tip 31 and protrudes around the usual or desired sliding tube projection from Z. B. 4 to 6 mm out of the shaft tip 31. There is no need for an internal attack if Sufficient internal glide path is available.

The clamping device 4 also has radial slots 45, which they almost completely axially penetrate, whereby a particularly smooth radial mobility of the clamping device 4 is achieved.

With the rear end 42, which has a conical lead inlet 49, the clamping device 4 r axially within the front end 81 of the mine storage tube 85 forming a mine storage space 8 movably guided with respect to this, wherein the guide is designed in such a way. that the rear End 42 slides without friction in the front end 81> and with axial pressure opposite in the axial direction this is displaceable, which in turn makes manufacturing tolerances in the simplest possible way can be compensated and the manual lead advance via the cap 9 in the manner described above y> can be effected.

Above the rear end 72 of the sliding bush 77, a compression spring 67 is arranged, which is on a The crossbar of the housing 3 is supported and with the help of which the lead advance via the lead supply tube 85 and jo can be made via the cap 9 acting as a push button.

The mine storage space 8 has at its lower end a serving for better insertion of the mine 5 Inlet slope 83 and is at its rear) 5 End 82 closed by an eraser element 10 in which a cleaning needle 11 is arranged.

For the axially limited introduction of the eraser element 10, a sleeve IZ is used during the axial The mine supply tube 85 is limited to the rear by a stop 84 which, in turn, is attached a bead on the main part 33 is supported.

In the case of the FIG. The filler pencil 1 shown in FIG. 2 is also the axially sliding lead guide tube 2 in the shaft tip 31 of the housing 3 and has a shoulder 21 on which a helical compression spring formed spring element 6 is supported.

The rear support of the spring element 6 takes place on the inwardly tapering conical support zone 44 of the front end 41 of the Klemmvorrich- "> o device 4 The clamping bush 7 is axially immovable in the main part 33 of the housing v> 3 and with its rear end 72 serves at the same time for the rear end 42 of the clamping device 4 for its axially sliding guidance.

A fco closes at the rear end 42 of the through hole 48 of the clamping device 4 conical lead inlet 49 on.

For axial Toleranzausgleichung and especially to Ermögiichung of sdbstiätigen mine transport berm letter or the respective withdrawal of the pin from the writing support the ts clamp device 4 is in this case slightly axially movably mounted within the clamping sleeve 7 and-self-locking retained in the conical inner bore 73 of the clamping sleeve 7 during the writing .

The mine storage space 8 within the main part 33 and the rear section 32 of the housing 3 is also closed here by an eraser element 10 which is covered by a cap 9 and into which a cleaning needle 11 is inserted. A sleeve 12 is also located on the eraser element 10 to delimit it axially.

In the sectional view according to FIG. 3 is, in particular, an embodiment of FIG front ends 41 of the clamping device 4 can be seen, to which each half-shell is assigned Roller body 47 connects, which comes to rest on the clamping sleeve 7.

The separation of the two halves of the clamping device 4 is brought about by the radial slots 45 which, starting from the bore 48, completely penetrate the clamping body radially. Ute clamping bush 7 is surrounded by housing 3.

F i g. 4 shows in enlarged form an alternative embodiment of a filler pencil, which is similar to that according to FIG. Fig. None within the main part 33 of the housing 3 has axially movable sliding bush 77, the through-hole 74 is towards the front end as widening conical inner bore 73 continues, within which the roller bodies 47 slide axially movably over during the writing process the front end 41 of the clamping device 4 cause the radial pressure on the mine 5.

On the lead guide tube 2 there is also a projection 21, which is also developed here as a lead brake 22 and can receive between radial compressive stress from the outside through the front end 61 of the spring element 6: ·, can

The rear end 62 of the spring element 6 rests against the support zone 44 of the front end 41 of the clamping device 4 and thus causes the pressure to be applied axially and radially outward. A follow-up mine 51, which has already automatically collapsed into the bore 48 of the clamping device 4 via the conical lead inlet 49, adjoins the mine 5. Which, as can be clearly seen Radialsdilitze 45 extremely long executed, also cause this case once again a particularly light and delicate, iädiale own or beaufscnlagungsbedingte suspension of the front ends 41 of the clamping device 4. After the individual ieiiernden segments only C ^u - r a relatively short rear end 42 are completely connected to one another and held or moved without friction within the front end 81 of the mine supply tube 85.

The compression spring 67 and corresponding adjustments between the lead storage tube 85, the clamping device 4 and the sliding bush 77, as well as the stop surface 34, also allow an additional one here Operation of the clamping mechanism by hand, whereby the sliding bush 77 in turn has radial slots at its rear end 72 to with the front End 81 of the mine supply tube 85 during certain phases of the movements effected by hand in to be able to enter clamping operative connection.

The in F i g. 5 shown enlarged representation of the embodiment according to FIG recognize that on the lead tube 2 or on its Approach 21 a mine brake 22 is present and that a centering lug 23 for receiving the front end 61 of the spring element 6 is used

The rear end 62 of the spring element 6 is located

also here at the conically inwardly tapering support zone 44 of the front end 41 of the Clamping device 4 on. Furthermore, there is a at the front end 41 of the clamping device 4 Recess 46 for receiving the roller body 47. The -, here again as axially immovable and with the Hauptttii 33 of the housing 3 firmly connected clamping socket 7 has at its front end 71 a conical extension of its through-hole 74 Inner bore 73, which enlarges towards the front and shows a collar 78 as an assembly stop or as an axial limit for the clamping sleeve 7 par excellence.

On the clamping device 4 it can also be seen that its radial slots 45 in turn support the clamping body, axially penetrate almost completely, so that only at the rear end 42 a short, circumferential connected section is present.

The rear end 42 also has the conical 2n widening towards the mine storage space 8 Mine inlet 49, which on the other hand continues in the bore 48 and the lower end of the Mine storage space 8 forms.

At the same time, the rear end 42 of the clamping device 4 becomes within the rear end 72 of the clamping sleeve 7 guided axially without friction.

Fig. 6 shows an enlarged view of the mine guide tube 2, in whose fixed extension i \ an opening 24 is incorporated, in which a section 65 of the spring element 6 is held, whereby this section 65 at the same time as a mine brake 22 for the inside of the mine guide tube 2 axially moving mine 5 is used.

The centering device is still located on approach 21. means 23 6 to the fixed receiving the spring element executed here as a helical compression spring Fig. 7 shows an alternative embodiment of the boss 21 on the lead guide tube 2, whereby here the mine 5 mse from a formed on extension 21 Miner.br "is held 27 whose radial Brem ; dn; ck is effected or reinforced by a clamping ring 66 formed from the spring element 6.

The mine brake 22 is formed here by radially slotted extensions of the projection 21. j ·.

In this embodiment in particular, a one-piece design of the lead guide tube 2 is also possible and approach 21 made of plastic or metal.

FIG. 8 shows an alternative embodiment of the inventive concept v> to the previous representations in the rest position. Here, the end face of the front end 41 of the clamping device 4 is conical Outwardly and rearwardly widening support zone 43 formed on which the rear end 62 of the Spring element 6 is supported

The clamping device 4 here has a natural spring acting radially outward, which is shown in the runep. '' ■ "- <> s pin the individual clamping segments so wide open ηάιϊ, üdL> : -'- Mine 5 to the mine brake 22 fall freely Lzr, ... >" The length and the pressure force of the spring element 6 is matched accordingly

Only through the transmitted through the spring element 6 additional writing pressure is, with the assistance of the Roükörper 47, which is here within the clamping socket 7 are mounted in the housing 3, and rear clamping slopes 16 at the front end 41 of the Clamping device 4, which causes the mine 5 to be clamped firmly.

When the lead guide tube 2 is lifted off the writing pad, this clamping is released the self-locking-free storage between the clamping device 4 and the clamping bush 7 immediately again, so that the mine 5 is only held by the mine brake 22 and here thus moved forward again with this and the lead tube 2.

F.iRL Relative movement between mine 5 and mine guide tube 2 always takes place only during the writing process itself and only in such a way that the lead guide tube is 2 moved backwards towards the clamping device 4 with respect to the mine 5, while the mine 5 practically stops (exception: the first lead to be introduced).

This functional sequence is the same in all embodiments of the inventive concept.

The further mode of operation of the invention described by means of the aforementioned examples can be as follows represent as follows:

The first of those filled into the mine storage space 8 Mines 5, which are followed by the subsequent mines, first fall through the mine inlet 49 and 83, respectively Bore 48 of the clamping device 4 up to the mine brake 22 within the extension 21 on the mine guide tube 2. After placing the lead guide tube 2 on the writing pad or several times after repeated pressure on the cap 9 in the embodiments according to FIGS. 1 and 4, the mine 5 Moved forward within the mine guide tube 2 until it emerges at its end face and is ready to write Available.

Each time the lead guide tube 2 is placed on the writing pad, e.g. B. after each Withdrawal of the pen while writing, the lead 5 is then around the area written off up to then - as described - automatically tracked as it moves backwards through the Writing pressure held by the clamping device 4 or its front end 41 and at Lifting off from the writing pad and thus with the due to the spring elements 6 and 63 caused axial movement directed forwards or towards the pen tip and at the same time acting radial clamping or friction of the mine brake 22 together with the mine guide tube 2 to is taken to the stop on the shaft tip 31 to the front.

Di.s essential of the invention is based on the The fact that the clamping device 4 in the rest position or in the relaxed state, d. H. if the filling pencil 1 is not used, exerts no radial clamping effect on the mine 5, while the mine 5 at slight axial, additionally acting pressure - for example when writing - through the lead guide tube 2 via the spring elements 6 and 63, due to the inwardly directed radial action, for example the conical inner bore 73 of the clamping bush 7 remotely, the sliding bush 77, axially immovable will.

If, on the one hand, both the sliding bush 77 and the clamping device 4 are designed to be axially movable and matched to one another, a possibly desired pushing down by hand over the cap 9 are made, while on the other hand in the alternative embodiments according to FIGS. 2 and 4 a particularly simple and with extremely few individual parts

len manufacturable filler pencil is created, its Functional reliability that of the first embodiment, in particular due to the less existing moving parts, and solves the task in the most advantageous way.

The alternative embodiments for forming the approach 21 cuw. the mine brake 22, as in FIG. 6th 7 and 7, result in particularly simple and inexpensive braking elements for the mine 5 within the Mine guide rollers 2.

To the friction between the clamping device 4 and the clamping bush 7 or the sliding bush 77 To keep as low as possible, it has proven to be particularly advantageous if both parts are only Touch point-like and at least in the contact areas hard and smooth surfaces exhibit.

ULI IXUIIfMMfJCI

5 47

a simple pressure edge or a pressure point per clamping segment on the clamping bush 7 or on the sliding bush 77 can be provided if the smooth clamping and unlocking of both parts is ensured by arranging a smooth and self-locking-free clamping slope 16 at the front end 41 of the clamping device 4. Of course, the arrangement is also reversible or exchangeable, so that the clamping device 4 can have the pressure edges and the clamping bush 7 or the sliding bush 77 can have the clamping bevel which is free of self-locking.
As a spring element 6 or 63 for the inventive

10

Arrangement is next to the illustrated helical compression spring or the molded spring bars each any, in particular axially expandable and compressible element with a suitable and durable Elasticity and the corresponding dimensions can be used, although it should be noted that the Spring pressure does not become too strong, even if the lead guide tube is almost completely "inscribed", in order not to Due to the increased writing pressure required, premature signs of fatigue appear in the writer to call out.

Under "self-locking-free contact crown" is meant, in particular, that the contact between the touching parts do not cause any self-clamping, but that after the additional. Write or release pressure can automatically detach both parts from each other.

L / IC /.UMtMIUCSl ICIIWLtSt. MJIIISI-III-I

can also have additional stops or anti-slip devices for the spring elements 6 or 63, if the rear end 62 of which, for example, is not designed to be closed, but rather from individual ones There is slats or similar elements.

A particular advantage of the filler pencil 1 according to the invention is also in the fact too see that the lead 5 is always held without strong clamping pressure when not written with the pen so that no lead breakage due to cold flow occurs if the pen remains unused for a long period of time.

For this purpose 3 sheets of drawings

Claims (12)

Patent claims: 1. Filling pencil with automatically occurring lead advance when writing, which has an axially movable lead guide tube, which at least partially emerges from the shaft tip and with an axially movable between two stops Clamping device with funnel-shaped mine inlet! Äüf, for holding a mine during the Writing; and which is equipped with a spring element that extends axially between the Mine guide tube and the clamping device is located and is at the rear end of the Mine guide tube or on a connected or in contact with this approach supports, characterized that the rear end (62,64) of the spring element (6; 63) at the front end (41) of the Clamping device (4) rests on this under axial and radial pressure, that the clamping device (4) is designed to act directly on the mine (5) and at least in the pressure area of the spring element (6) has conical support zones (43; 44), that the contact zone of the clamping device (4) with a clamping bush (7) or with a sliding bush (77) is designed to be self-locking, that the axial length of the spring element (6; 63) and its axial and radial compressive force in such a way is dimensioned that the clamping device (4) is always in the open position in the rest position, while through the additionally acting writing pressure or by the actuation pressure via eir .; Cap (9) the The clamping device (4) closes after a slight axial and radial movement and holds the mine (5) in a non-slip manner, that the smallest diameter of the bore (48) of the clamping device (4) in its open position is larger than the diameter of the mine (5), and that the lead guide tube (2) or a projection (21) connected to it - as per se known - has a mine brake (22) 2. Filling pencil according to claim 1, characterized in that the clamping device (4) at its front end (41) has an inwardly tapering, at least partially conical support zone (44) on which the rear end (62; 64) of the spring element (6; 63) rests 3. Filling pencil according to claim 1 or 2, characterized in that the clamping device (4) has a Has its own resilience directed radially outwards and at its front end (41) with itself outwards widening, at least partially conical, support zones (43) are provided on which the rear end (i> 2) of the spring element (6) supports 4. Filling pencil according to one of the preceding claims, characterized in that the Clamping device (4) consists of multi-armed clamping pliers having radial slots (45) and on the outer circumference of its front end (41) at least one freely rotatable in recesses (46) has mounted rolling body (47). 5. Filling pencil according to one of the preceding claims, characterized in that at least in the axial area of the front end (41) of the clamping device (4) one axially between two Stops in the housing (3) movable slide bushing (77) is arranged and that the clamping device (4) within this and within the front end (81) of a mine supply tube (85) as well is axially movable 6. Filling pencil according to one of claims 1 to 4, characterized in that at least in the axial Area of the front end (41) of the clamping device (4) has a clamping sleeve (7) axially immovable in the ίο Housing (3) is arranged and that the clamping device (4) slides axially in the clamping sleeve (7) is stored 7. Filling pencil according to one of the preceding claims, characterized in that the Clamping bushing (7) or the sliding bushing (77) has a through hole (74) which is used as the front end (71) widening conical inner bore (73) is formed and at least in the Area of this conical inner bore (73) a has a hard, smooth surface 8. filler pencil according to claim I, characterized in that a shoulder (21) of the lead guide tube (2) centering means (23) for the clamping definition of the front end (61) of the spring element (6) 9. filler pencil each claim 8, characterized in that the projection (21) at least partially as Mine brake (22) is formed 10. filler pencil according to claim 9, characterized in that the extension (21) as a mine brake (22) is designed such that a fixed clamping ring (66) of the spring element (6) through its Spring action causes radial pressure on the mine (5) 11. Filling pencil according to one of claims 1 to 9, characterized in that the extension (21) has openings (24) which are arranged such that a portion (65) of the Enter the spring element (6) and apply radial pressure the mine (5) can exercise. 12. Filling pencil according to claim i and 2, characterized in that the projection (21) is integral with one or more spring element parts of the spring element (63) is formed, which in turn on the clamping device (4).