DE4324476C2 - Writing or drawing device with writing medium compensation system - Google Patents

Description

The invention relates to a writing or drawing device a writing medium compensation system according to the preamble of Main claim.

Such writing or drawing devices are known. So z. B. in EP 0 089 067 B1, DE 30 37 257 C2 and in DE 36 40 320 C1 writing or drawing devices with Writing medium compensation systems shown and described that one inner and one outer equalizing channel have, with both channels usually capillary are trained and facing each other spiral or run helically and via a connecting channel communicate with each other. In contrast, in DE 36 40 320 C1 the outer channel is capillary and the inner channel is not capillary designed.

Although these compensation systems are already very much Capacity, it can still Shaking movements or when the internal pressure increases - e.g. B. by heating - to leakage of Writing materials come at the end of the outer compensation channel. For the particularly large-volume design of a writing Compensation is in DE 34 15 859 C2 in a so-called Plotter pen suggested, parallel ring chambers a non-capillary compensation system and by Capillary channels and capillary columns with each other and with a subsequent pressure equalizer. However, this has the disadvantage in the solution shown that the writing instrument easily leaks when stored horizontally and thus in the activated state only in a vertical position can be kept leak-proof, stored and stored. Furthermore, in DE 29 48 192 C2 and DE 40 24 382 C1 Writing inserts for tube writing instruments shown and described that only a helical compensation channel exhibit. Writing instruments with such writing inserts have the disadvantage that the compensating spiral system only  has an insufficient storage volume and therefore none high leak protection is guaranteed.

The object of the invention is therefore to write or Drawing device with a writing medium compensation system create a high even with a large storage volume Leakproofness and increased shaking and Overpressure resistance.  

This object is achieved with the features included in claim 1 solved.

Advantageous embodiments and further developments are in presented the further claims.

There are some embodiments of the invention With the help of the illustrations explained in more detail below.

Here shows:

Fig. 1 is a partial view of a writing instrument with a balancing system, partly in section and with activated writing tip,

Fig. 2 is a section through the not activated writing tip of the instrument of FIG. 1;

Fig. 3 is a cut nib with the inner part of the compensation system, without insert and

Fig. 4, the writing tip of Fig. 3, uncut and rotated by 90 °, with the outer part of the compensation system.

In the views of a generic writing or drawing device with a compensation system 5 shown in FIGS. 1 and 2, a writing tip 2 is shown in the activated state according to FIG. 1, that is to say with the writing medium memory 11 open as a full body, while FIG Represents cut in not activated new condition. The shaft 1 of the writing instrument or a writing instrument cartridge has a writing medium storage 11 which is sealed to the front in the new state by a closure 13 pressed into the opening 16 and receives the writing tip 2 inserted into the tip space 12 and provided with a writing tube 25 . The fastening zone 14 of the shaft 1 and the axial section of the tip fastening 24 are practically congruent in the activated, that is to say in the usable state of use, while in new condition these zones are axially offset by the assembly path 17 required to open the memory 11 . In a usable state of use, the insert 3 rests on the shaft-side stop 15 , as a result of which the writing tip 2 is fixed axially.

In this position, the circlip documenting the new condition is already separated from the housing 21 . On the lateral surface 23 of the writing tip 2 , the capillary outer channel 54 with the storage zone 56 as well as with the axially extending passage 58 that breaks through the retaining ring 57 is arranged, which continues axially towards the tip 27 in the air channel 55 .

On the inner surface 22 of the central bore of the housing 21 of the writing tip 2 , an insert 3 is fastened with its tubular extension 31 , which also delimits and covers the non-capillary inner channel 52 radially inward and in the filling space 32 a drop weight 4 provided with a wire 41 is axially movable is stored.

The writing medium flows in the use state is open shutter 13 via the inlet 33 of the same time as the falling weight fuse serving insert 3 in the filling space 32 and to the wire 41 in the bore of the writing tube 25 to its tip 27 and thus to the recording surface. 6

When excess pressure occurs in the accumulator 11 , the writing medium located in the writing tip 2 and in the insert 3 passes through the transverse bore 51 into the non-capillary inner channel 52 and possibly further via the transverse channel 53 into the capillary outer channel 54 of the compensation system 5 . The air displaced here escapes to the outside via the air duct 55 , ( 55 ', 55 ").

When pressure drops, the writing medium column located in the compensation system retracts in the opposite direction, since the negative pressure that arises in the storage 11 during use overcomes its capillary forces in the area of the outer channel 54 and is supported by the gravity of the writing medium in the area of the non-capillary inner channel 52 until this Compensation system 5 is completely emptied and then flows only in the area of the filling chamber 32 and in the writing tube 25 writing medium.

The inner channel 52 and the outer channel 54 are formed in that, on the one hand, the tube extension 31 comes to rest on the inner surface 22 and, on the other hand, the outer surface 23 on the inner wall of the tip space 12 .

The capillary outer channel 54 opens into the likewise capillary storage zone 56 , which is delimited towards the writing tip 2 by the retaining ring 57 . The passage 58 connects the storage zone 56 to the air duct 55 .

In FIGS. 3 and 4, the writing tip 2 with the inserted writing tube 25 of FIG. 1 and 2 shown separately, with the not yet sheared circlip and a threaded tip designed as a mount 24. The inner channel 52 is machined into the inner surface 22 of the housing 21 and the outer channel 54 and the longitudinal channels 54 'and 54 "are worked into the outer surface 23. The outer channel 54 opens into the longitudinal channels 54 ' and 54 " on both sides and the air channel 55 into axial sections 55 'and 55 ". Between the longitudinal duct 54 " and the air duct 55 or 55 ' there is the storage zone 56 delimited by the retaining ring 57 . The transverse channel 53 is used here for the connection between the outer channel 54 and the inner channel 52 .

In writing or drawing devices with a writing medium compensation system, each having an inner channel as an inner and an outer channel as an outer equalizing channel, the inner channel and the outer channel being spiral or helical, running in opposite directions and communicating with one another via a connecting channel, the outer channel is connected to an air duct, it improves the leakage security if the inner duct 52 of the compensation system 5 , based on the intended writing or drawing medium, has non-capillary and the outer duct 54 has a capillary cross section. The outer channel 54 opens into a highly capillary storage zone 56 with a higher capillarity than that of the outer channel 54 , which is delimited by a retaining ring 57 provided with a passage 58 . The air channel 55 , 55 ', 55 "connects axially to the passage 58 of the retaining ring 57 .

In addition, the outer channel 54 should be provided at least at the end with axially extending longitudinal channels 54 ', 54 ". It is particularly expedient if the outer channel 54 , or a longitudinal channel 54 " thereof, opens into a highly capillary stowage zone 56 , which is opened by a retaining ring 57 is limited, which on the one hand axially delimits and separates the storage zone 56 and on the other hand the air duct 55 , 55 ', 55 "and which has only one axially extending passage 58. The axially extending passage 58 in the retaining ring 57 should preferably be offset peripherally by 180 ° the longitudinal channels 54 ', 54 "of the outer channel 54 and to the axial sections 55 ', 55 " of the air channel 55. It is advantageous if both the inner channel 52 and the outer channel 54 of the compensation system 5 into the housing 21 of the writing tip 2 are incorporated.

To fasten the writing tip, a thread should be formed in the front area of the housing 21 as a tip fastening 24 , which is penetrated by the air duct 55 , 55 ', 55 ".

Positions

1

shaft

11

Storage

12th

Top room

13

Closure

14

Fortification zone

15

attack

16

opening

17th

Assembly path

2nd

Writing tip

21

casing

22

Inner surface

23

Lateral surface

24th

Tip attachment

25th

Writing tube

27

top

3rd

commitment

31

Pipe neck

32

Filling space

33

enema

4th

Drop weight

41

wire

5

Compensation system

51

Cross hole

52

Inner channel

53

Cross channel

54

Outer channel

54

',

54

"Longitudinal channel

55

,

55

',

55

"Air duct

56

Storage zone

57

Storage ring

58

Passage

6

Recording area

Claims (7)

1. writing or drawing device with a writing medium compensation system, each having an inner channel as an inner and an outer channel as an outer equalizing channel, the inner channel and the outer channel being spiral or helical, preferably running in opposite directions and communicating with one another via a connecting channel, wherein the outer duct to an air duct and is in communication with the inner channel of the balancing system based on the proposed writing or drawing medium, non-capillary and the outer capillary channel cross-section having characterized in
that the outer channel (54) with higher capillarity than that opens out of the outer channel (54) in a high capillary flow zone (56), which is delimited by a provided with a passage (58) storage ring (57)
and that the air duct ( 55 , 55 ', 55 ") adjoins the passage ( 58 ) of the retaining ring ( 57 ) axially. 2. Writing or drawing device according to claim 1, characterized in that the outer channel ( 54 ) has at least one end axially extending longitudinal channels ( 54 ', 54 "). 3. Writing or drawing device according to claim 1 or 2, characterized in that the retaining ring ( 57 ) on the one hand the storage zone ( 56 ) and on the other hand the air duct ( 55 , 55 ', 55 ") axially limited and separates from one another and only the axially extending Passage ( 58 ) has. 4. Writing or drawing device according to claim 2 and 3, characterized in that the passage ( 58 ) in the retaining ring ( 57 ) extends axially and peripherally offset by 180 ° to the longitudinal channels ( 54 ', 54 ") of the outer channel ( 54 ) and is arranged to axial sections ( 55 ', 55 ") of the air duct ( 55 ). 5. Writing or drawing device according to one of the preceding claims, characterized in that both the inner channel ( 52 ) and the outer channel ( 54 ) of the compensation system ( 5 ) in the housing ( 21 ) of the writing tip ( 2 ) are incorporated. 6. Writing or drawing device according to claim 5, characterized in that in the front region of the housing ( 21 ) a thread is formed as a tip attachment ( 24 ). 7. writing or drawing device according to claim 6, characterized in that the tip fastening ( 24 ) of the air duct ( 55 , 55 ', 55 ") is crossed.