Writing, drawing, marking and/or cosmetic device

Abstract

A writing, drawing, marking and/or cosmetic device, wherein the device includes at least one shaft and at least one inner body, wherein the at least one shaft is formed from concrete-containing material. The shaft at least partially surrounds the inner body. In the installation position the shaft is secured in an axial direction against axial displacement by a closing cover and a front part and a prestress is formed in the shaft in the axial direction via the closing cover and the front part.

Claims

1. A writing, drawing, marking or cosmetic device, comprising: at least one shaft; at least one inner body, wherein the at least one shaft is made of concrete-containing material, wherein the at least one shaft at least partially surrounds the at least one inner body; an end cover; and a front part, the end cover and the front part being arranged to hold the at least one shaft against axial displacement in an axial direction in a mounting position, and to create a pretensioning in the shaft in the axial direction via the end cover and the front part.

2. The device according to claim 1, wherein, the at least one inner body has at least one inner sleeve, the end cover and the front part.

3. The device according to claim 2, further comprising means for adjusting the pretensioning, the means for adjusting pretensioning being formed on the at least one inner body, between the at least one inner sleeve and the end cover.

4. The device according to claim 2, wherein at least one latching mechanism, an adhesive connection or other rigid connection is formed on the at least one inner body between the at least one inner sleeve and the end cover.

5. The device according to claim 2, wherein the at least one inner sleeve and the front part form a single piece.

6. The device according to claim 2, further comprising means for adjusting the pretensioning, the means for adjusting pretensioning being formed on the at least one inner body, between the at least one inner sleeve and the front part.

7. The device according to claim 2, wherein at least one latching mechanism, an adhesive connection or other rigid connection is formed on the at least one inner body between the at least one inner sleeve and the front part.

8. The device according to claim 2, wherein the at least one inner sleeve and the end cover form a single piece.

9. The device according to claim 1, wherein the concrete-containing material of the shaft is concrete or fine concrete.

10. The device according to claim 1, wherein the concrete-containing material is a mixture of concrete with cellulose-containing material.

11. The device according to claim 1, wherein at least one of the end cover and the front part is made of plastic to absorb occurring forces.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) FIG. 1: section through a writing, drawing, marking and/or cosmetic device according to the invention.

(2) FIG. 2: schematic representation of the flow of force in a pretensioned sleeve according to the invention.

(3) FIG. 3: schematic representation of the flow of force in a non-pretensioned sleeve.

(4) FIG. 4: schematic representation of a screw connection.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIG. 1 shows a device constructed according to the invention having adjusting means 201 for pretensioning a shaft 1 made of concrete-containing material.

(6) In addition to the shaft 1 and adjusting means 201, the device has an application element 3 having a writing tip 30. Furthermore, an inner body 2, consisting of inner sleeve 20, adjusting means 201, latching mechanism 202, end cover 21 and front part 22, is arranged within the shaft. A feed mechanism, which is controlled by the latch 4, is integrated in this embodiment of the device.

(7) The shaft 1, which at least partially encases the inner body 2, has a cover stop 212 and a support surface 221 in the axial direction, which securely hold the shaft 1 against axial displacement in the installed state. The front end face 12 and the rear end face 11 come to rest against the cover stop 212 and support surface 221 in the installed state. In the present embodiment, the end cover 21 has a cover thread 211 which interacts with the adjusting means 201 of the inner sleeve 20. A latching mechanism 202, which latches with the front part 22 of the inner body 2, is formed at the opposite end of the inner sleeve 20. It has proven to be advantageous when the front part 22 and/or the end cover 21 are made of plastic, whereby tension peaks during the application of force are avoided. The inner sleeve 20 is made of brass in the present case. Alternatively, plastic can also be used here for the inner sleeve. Due to this construction of the inner body 2, the installed shaft 1 can be continuously pretensioned via the rear end wall 11 and the front end wall 12 via the threaded connection/cover thread 211. It has been shown here that the stability of the shaft 1 against breakage of the quite thinly designed shaft wall is increased by such a pretensioning.

(8) A pretensioning is thereby generated in which a pretensioning/clamping force acts on the shaft 1 with a tightening torque of the end cover 21.

(9) In one embodiment, not shown, it also is possible to use an adjusting mechanism instead of a latching mechanism (202) on the inner body (2) which latches with the front part (22), for example, to connect a threaded connection between front part (22) and inner sleeve (20).

(10) FIG. 2 shows a schematic representation of the flow of force in a shaft 1 pretensioned according to the invention. For better representation in enlarged form.

(11) A clamping force FK is applied to the shaft via the pretensioning of the inner body. Here, the clamping force generates a pressure which is introduced distributed into the shaft 1 via the cover stop of the end cover and the support surface of the front part. The pressure applied to the shaft always moves away from the shaft in terms of force, wherein the only degree of freedom for the movement is radially outward. The shaft 1 made of concrete-like material is pretensioned towards the outside in this way. A curvature that cannot be seen with the naked eye in the radial direction away from the central axis, that is, in the radial direction, is achieved. This principle is known from bridge construction. A pretensioning in the radial direction to the center axis cannot take place, since the inner sleeve 20 counteracts there.

(12) It should be noted here that it has proven to be advantageous when the outer surface 203 of the inner sleeve 20 is not firmly connected to the inner wall 13 of the shaft 1, since otherwise the force/pressure transmission and the resulting pretensioning of the shaft is not or cannot be—freely—formed.

(13) If now, during use of the device having a shaft 1 made of concrete-like material, there is an impact and/or stress concentration with a force FS from the outside, in an extreme case perpendicular to the shell surface 14 in the direction of the center axis, then said force FS counteracts the pretensioning by deflecting the force FS by the pretensioning/pretensioning force towards the ends/end faces of the shaft.

(14) FIG. 3, on the other hand, shows the schematic representation of the flow of force in a non-pretensioned shaft 1. Since the shaft does not or does not have to absorb any clamping force (FK) via its end faces, no internal flow of force can be represented. Such a non-pretensioned shaft 1 tends to break easily or crack in the installed state, as soon as a force FS strikes the shell surface 14 of the shaft 1, since no internal pretensioning forces counteract it.

(15) Not shown in the figures, but in principle just as possible, the shaft can be a shaft/tubular shaft element of a closure cap for the claimed device. The principle of pretensioning is identical to the situation described above.

(16) Likewise, the shaft can be a shaft/sleeve-shaped shaft element of a latch element. The principle of pretensioning is identical to the situation described above.

(17) For a better understanding of the generation of the pretensioning/clamping force, FIG. 4 shows a representation of the conversion ratio from the tightening torque to the clamping force (FK).

(18) The clamping force (FK) is the force that acts on the rear end face (11) and front end face (12) of the shaft (1).

(19) Some formulations and a frame formulation for a concrete-containing material for producing a device having a shaft according to the invention are listed below.

Example 1: Fine Concrete

(20) TABLE-US-00001 Cement 23% by weight Ash 16% by weight Water 11.5% by weight.sup.  Sand 49% by weight Superplasticizer 0.5% by weight 

Example 2: Concrete Material Having a Density of the Mixture of Density 0.23 g/cm3 for Processing in the Extrusion Process

(21) TABLE-US-00002 White Portland cement 1.00 kg Glass beads 0.90 kg Water 1.60 kg Tylose 4000 0.20 kg Cellulose fibers 0.04 kg

(22) Frame Example: Concrete Casting Compound

(23) TABLE-US-00003 Cement 40-60% by weight Quartz flour 20-30% by weight Water 12-22% by weight Superplasticizer  2-5% by weight Cellulose fibers  3-9% by weight

(24) The shafts for the devices according to the invention can be produced by extrusion or casting molds.

(25) These manufacturing methods allow the shafts to be made of concrete and concrete-like material with different/any outside and inside cross-sections

POSITION LIST

(26) 1 shaft 11 rear end face 12 front end face 13 inner wall 14 shell surface 2 inner wall 20 inner wall 201 adjusting means 202 latching mechanism 203 outer surface 21 end cover 211 cover thread 212 cover stop 22 front part 221 support surface 3 application element 30 writing tip 4 latch