EP0033352A1 - Tableau à écrire, en particulier tableau mural de grande surface - Google Patents

Tableau à écrire, en particulier tableau mural de grande surface Download PDF

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Publication number
EP0033352A1
EP0033352A1 EP80100505A EP80100505A EP0033352A1 EP 0033352 A1 EP0033352 A1 EP 0033352A1 EP 80100505 A EP80100505 A EP 80100505A EP 80100505 A EP80100505 A EP 80100505A EP 0033352 A1 EP0033352 A1 EP 0033352A1
Authority
EP
European Patent Office
Prior art keywords
sheet
glass plate
glass
writing board
writing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80100505A
Other languages
German (de)
English (en)
Other versions
EP0033352B1 (fr
Inventor
Karl-Hermann Weyel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weyel KG
Original Assignee
Weyel KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weyel KG filed Critical Weyel KG
Priority to AT80100505T priority Critical patent/ATE8359T1/de
Priority to DE8080100505T priority patent/DE3068483D1/de
Priority to EP80100505A priority patent/EP0033352B1/fr
Publication of EP0033352A1 publication Critical patent/EP0033352A1/fr
Application granted granted Critical
Publication of EP0033352B1 publication Critical patent/EP0033352B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
    • B43L1/04—Blackboards
    • B43L1/06—Blackboards rigid

Definitions

  • the invention relates to a writing board, in particular to a large-scale wall board, with a transparent glass plate, one side of which serves as a writing surface and is roughened, and with a support on which the glass plate rests.
  • a main advantage is that even after a long period of use of the board, the writing surface is still rough and therefore easy to write on, since glass is very hard and therefore bumps that result in the desired roughness are not removed.
  • Another advantage is that the writing on glass panels has a plastic effect, since the glass plate is translucent and therefore the writing on the back of the glass plate, on which a non-translucent, e.g. layer consisting of a varnish on the back and possibly the ruling is casting a shadow. Glass plates also have a high resistance to chemical influences. The writing surface of glass boards can be made very evenly without difficulty.
  • the glass plates of known sheets have a relatively large thickness of, for example, 4 to 5 mm in order to obtain adequate security against breakage. This results in a relatively large weight of known boards. Nevertheless, the security against breakage still leaves something to be desired. Sheets cannot be held on glass panels by means of magnets, as is often desirable for teaching purposes.
  • Blackboards are also known whose writing surface consists of an enamelled steel sheet. Such boards can not break, because in the event of impact, the enamel can flake off and are good for interacting with holding magnets, but all the advantages that a board with a writing surface made of glass lack, because enamel is less hard than glass, a shadow cast of the writing is not chemical resistance is lower than that of glass and the enamel surface cannot be produced as evenly as a roughened glass surface.
  • the invention has for its object to form a board of the type mentioned in such a way that the advantages of boards with a glass pane are combined with the advantages of boards whose writing surface consists of an enamelled steel sheet.
  • the carrier is a sheet, preferably a steel sheet, and in that an elastic intermediate layer connected to both the sheet and the glass sheet is arranged between the glass sheet and the sheet.
  • a panel designed in this way has a much greater break resistance than a glass panel of a known type. If the glass plate is nevertheless destroyed, the risk of an accident is extremely low, since the plate acts like laminated safety glass, i.e. the glass sheet will usually only get cracks that remain connected to the elastic intermediate layer, so that no dangerous splinters detach from the sheet. Since the font can cast a shadow in the Tael tablet according to the invention, the plasticity of the font is preserved, as in the case of known glass panels. The uniformity of the surface can also be achieved as with known glass panels. The other advantageous properties of a glass sheet (chemically resistant surface, long retention of the roughening) are also present. When using steel sheet for the carrier, the advantage is gained over known boards that magnets can be attached to the writing surface, since the distance of the writing surface from the steel sheet is relatively small and therefore sufficiently large magnetic forces are still present.
  • sheet and glass have different coefficients of thermal expansion, thanks to the elastic intermediate layer, the glass does not separate from the sheet, since different thermal expansions are absorbed by the elastic intermediate layer through its elastic deformation, without this layer being destroyed or detached from the sheet or the glass plate .
  • the sheet usually a steel sheet, has a greater coefficient of thermal expansion than glass. Since temperature influences act on the front of the panel in particular, the disadvantage of the different coefficients of thermal expansion is alleviated, i.e. the temperature fluctuations on the sheet are generally slower than the temperature fluctuations on the glass plate.
  • the sheet can serve as the only support. But you can also provide a further support on which the sheet rests (claim 10). An additional support will be provided especially if the board is movable and / or free-standing. If the board is fixed to a wall, however, comes the use without additional carrier into consideration. If the panel according to the embodiment of claim 2 has a glass plate on both sides of the sheet, an additional support is naturally not used. In this case, the board consists of five layers, namely two glass plates, two elastic intermediate layers and a sheet. This layer structure already achieves a high level of dimensional stability of the board.
  • the coating of the metal sheet according to claim 3 is particularly advantageous.
  • a high degree of security against detachment of the coating is achieved, since paint, in particular baked paint, adheres very well to a steel sheet and does not detach even under the influence of moisture.
  • An equally good connection of a lacquer layer with glass cannot be achieved.
  • the lacquer layer can also have the ruling, which will also usually be the case if the sheet is lacquered.
  • the elastic intermediate layer must be transparent if the lacquer is to be visible from the writing surface. However, it is possible that the elastic intermediate layer is itself colored and thus forms the background against which the writing stands out.
  • Silicone is particularly well suited as an elastic intermediate layer (claim 5).
  • Other materials, in particular plastics, are also suitable, which can be bonded sufficiently firmly to glass and the sheet metal or the coating of the sheet and have a sufficiently high elasticity over a sufficiently large temperature range.
  • the same material can be used for the glass plate as for known glass panels, namely a silicate glass (claim 6).
  • the thicknesses of the layers can be in the ranges specified in claims 7 to 9.
  • the thicknesses also depend on the size of the sheet, generally the thicker the sheet the larger the dimensions of the sheet. Is essential Lich 1, that the glass plate is much thinner than in prior art glass sheets. This has the advantage of relatively low weight and material savings. The usage Thinner glass plates are possible because the break resistance is no longer essentially achieved by a large thickness of the glass plate, but by the connection with a sheet.
  • the board can have relatively large dimensions, namely the usual dimensions of a wall board, the height h being 1500 mm and the width b being 2100 mm.
  • the layer structure of the table is shown in Fig. 2.
  • the board has a support 1 made of sheet steel, a lacquer layer 2, a transparent elastic intermediate layer 3 and a glass plate 4.
  • the sheet 1 can have a thickness s 1 of 0.3 to 0.6 mm, the elastic intermediate layer a thickness s 3 of 0, 5 mm and the glass plate 4 have a thickness s 4 of 1.5 to 3.2 mm.
  • the paint layer 2 is comparatively very thin. Its thickness s 2 can be, for example, 0.03 mm.
  • the glass plate 4 is roughened on its free side 4a as is usual with glass writing boards, e.g. by sandblasting, whereby a roughness depth of 17 ⁇ (0.017 millimeters) is produced.
  • the rear side 4b can also be roughened in order to obtain a good connection with the elastic intermediate layer 3, which is preferably made of silicone.
  • the lacquer layer 2 preferably a stove enamel, can have the usual green blackboard color.
  • the lacquer layer can also contain a ruling 5 which is visible from the front of the board (see FIG. 1).
  • the varnish layer can be produced in such a way that first a basic color is applied, for example by spraying, and that after drying of the base layer with a different color, preferably white-colored, an L is applied ineatur and that subsequently thereto heated in a drying oven of the paint.
  • the sheet is preferably protected against rust overall. This can be done, for example, by painting the entire metal sheet or by applying another anti-rust coating, e.g. a galvanizing.
  • the silicone layer 3 is applied in the liquid state in order to obtain a good connection with the adjacent layers. It may be expedient to use a vacuum in order to avoid air bubbles or other gas bubbles in the layer 3.
  • the writing surface 4a for example, writing applied with chalk casts a shadow on the lacquer layer 2, so that the writing is as plastic as in known glass boards.
  • a thickness of the glass plate of, for example, 3 mm and a thickness of the layer 3 of, for example, 0.5 mm, this distance is 3.5 mm.
  • the glass plate 4 is thinner than in known glass plates. For the plasticity of the writing, however, it is not only the thickness of the glass plate that is decisive, but also the sum of the thicknesses of layers 3 and 4.
  • the coefficient of thermal expansion of the plate 1 is greater than the coefficient of thermal expansion of the glass plate 4. Nevertheless, the glass plate 4 and the plate 1 do not detach from the layer 3, since different thermal expansions only lead to an elastic deformation of the layer 3. Fluctuations in temperature, for example due to solar radiation, generally act on the panel from the front 4a, which is favorable for the overall deformation, since relative displacements between the sheet 1 and the glass plate 4 are less pronounced than with the preferred effect of temperature fluctuations the sheet 1. However, the intermediate layer 3 is still able to absorb different thermal expansions even in the event of such temperature fluctuations.
  • a tablet can also be used without an additional support, e.g. as a blackboard fixed to a wall.
  • the layer structure is the same on both sides and corresponds to the layer structure according to FIG. 2.
  • the board has two writing surfaces 4a and 4'a.
  • one side of the board has a non-lined writing surface and the other side has a lined writing surface.
  • paint layer 2 in one color and paint layer 2 'with a ruling.
  • the board can be surrounded by a frame.
  • a frame is definitely advantageous, even for a table according to FIG. 2, in order to protect the edges of the glass plates 4, 4 'and to avoid sharp edges.

Landscapes

  • Drawing Aids And Blackboards (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Laminated Bodies (AREA)
  • Panels For Use In Building Construction (AREA)
  • Surface Treatment Of Glass (AREA)
EP80100505A 1980-02-01 1980-02-01 Tableau à écrire, en particulier tableau mural de grande surface Expired EP0033352B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT80100505T ATE8359T1 (de) 1980-02-01 1980-02-01 Schreibtafel, insbesondere grossflaechige wandtafel.
DE8080100505T DE3068483D1 (en) 1980-02-01 1980-02-01 Writing board, in particular large wallboard
EP80100505A EP0033352B1 (fr) 1980-02-01 1980-02-01 Tableau à écrire, en particulier tableau mural de grande surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP80100505A EP0033352B1 (fr) 1980-02-01 1980-02-01 Tableau à écrire, en particulier tableau mural de grande surface

Publications (2)

Publication Number Publication Date
EP0033352A1 true EP0033352A1 (fr) 1981-08-12
EP0033352B1 EP0033352B1 (fr) 1984-07-11

Family

ID=8186588

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80100505A Expired EP0033352B1 (fr) 1980-02-01 1980-02-01 Tableau à écrire, en particulier tableau mural de grande surface

Country Status (3)

Country Link
EP (1) EP0033352B1 (fr)
AT (1) ATE8359T1 (fr)
DE (1) DE3068483D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5116979A (en) * 1989-09-12 1992-05-26 Mitsui Toatsu Chemicals, Incorporated Dihydrocaffeic acid derivatives and pharmaceutical preparations containing same
WO2000030867A1 (fr) * 1998-11-19 2000-06-02 Guardian Llodio, S.A. Procede de fabrication d'un tableau, et tableau obtenu conformement audit procede
CH699483A1 (de) * 2008-09-01 2010-03-15 Troesch Glas Ag Ferromagnetische Einrichtung mit wiederbeschreibbarer Nutzfläche.
CN105159024A (zh) * 2014-06-03 2015-12-16 波利视觉股份有限公司 投影和通讯板及其制造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78125C (de) * J. KÖSTNER, J. klein 11. J. HASTREITER, Furth i. Walde, Bayern Schreibtafel
FR371344A (fr) * 1906-11-12 1907-03-05 Wojislav Stevanovitsch Ardoise artificielle pous écrire ou dessiner
DE356889C (de) * 1921-03-30 1922-08-04 Jacob Kranz Verfahren zur Herstellung einer unzerbrechlichen Schreibtafel
US2303120A (en) * 1940-06-25 1942-11-24 Adelaide M Greaves Walker Glass chalkboard
FR987539A (fr) * 1949-04-02 1951-08-14 Mullca Tableau à écrire perfectionné
FR59717E (fr) * 1949-10-08 1954-07-16 Mullca Tableau à écrire perfectionné
DE1916397A1 (de) * 1969-03-31 1971-01-07 Schulwandtafelfabrik Walter We Schultafel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE78125C (de) * J. KÖSTNER, J. klein 11. J. HASTREITER, Furth i. Walde, Bayern Schreibtafel
FR371344A (fr) * 1906-11-12 1907-03-05 Wojislav Stevanovitsch Ardoise artificielle pous écrire ou dessiner
DE356889C (de) * 1921-03-30 1922-08-04 Jacob Kranz Verfahren zur Herstellung einer unzerbrechlichen Schreibtafel
US2303120A (en) * 1940-06-25 1942-11-24 Adelaide M Greaves Walker Glass chalkboard
FR987539A (fr) * 1949-04-02 1951-08-14 Mullca Tableau à écrire perfectionné
FR59717E (fr) * 1949-10-08 1954-07-16 Mullca Tableau à écrire perfectionné
DE1916397A1 (de) * 1969-03-31 1971-01-07 Schulwandtafelfabrik Walter We Schultafel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5116979A (en) * 1989-09-12 1992-05-26 Mitsui Toatsu Chemicals, Incorporated Dihydrocaffeic acid derivatives and pharmaceutical preparations containing same
WO2000030867A1 (fr) * 1998-11-19 2000-06-02 Guardian Llodio, S.A. Procede de fabrication d'un tableau, et tableau obtenu conformement audit procede
CH699483A1 (de) * 2008-09-01 2010-03-15 Troesch Glas Ag Ferromagnetische Einrichtung mit wiederbeschreibbarer Nutzfläche.
CN105159024A (zh) * 2014-06-03 2015-12-16 波利视觉股份有限公司 投影和通讯板及其制造方法

Also Published As

Publication number Publication date
DE3068483D1 (en) 1984-08-16
EP0033352B1 (fr) 1984-07-11
ATE8359T1 (de) 1984-07-15

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