WO1993015919A1 - Effaceur pour tableaux noirs ou blancs - Google Patents

Effaceur pour tableaux noirs ou blancs Download PDF

Info

Publication number
WO1993015919A1
WO1993015919A1 PCT/DK1993/000052 DK9300052W WO9315919A1 WO 1993015919 A1 WO1993015919 A1 WO 1993015919A1 DK 9300052 W DK9300052 W DK 9300052W WO 9315919 A1 WO9315919 A1 WO 9315919A1
Authority
WO
WIPO (PCT)
Prior art keywords
eraser
white
side walls
members
blackboards
Prior art date
Application number
PCT/DK1993/000052
Other languages
English (en)
Inventor
Jørgen THUESEN
Original Assignee
Thuesen Joergen
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 Thuesen Joergen filed Critical Thuesen Joergen
Publication of WO1993015919A1 publication Critical patent/WO1993015919A1/fr

Links

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
    • B43L21/00—Blackboard or slate cleaning devices

Definitions

  • the invention relates to an eraser for white- or blackboards comprising an inner and an outer cupular member, each of which has a bottom with two subs ⁇ tantially straight, parallel sides from each of which a
  • a web-shaped eraser material may be fastened distended across the bottom of the inner member, the ends of the eraser material being kept squeezed between the adjacent side walls.
  • eraser supplementary internal side walls in the outer member In this prior art eraser supplementary internal side walls in the outer member
  • the hollow space between the two members may be used as a magazine for a roll of the web-shaped material, when the web-shaped material
  • the object of the present invention is to pro ⁇ vide an eraser for white- or blackboards of the above mentioned type in which the eraser material distended across the bottom of the inner member may be renewed in a simple manner without having to completely separate the two members, thereby involving the risk that a magazine roll of eraser material might fall out of the hollow space of the eraser.
  • This is achieved according to the invention by means of an eraser for white- or blackboards that is characteristic in comprising means for retaining the two members against opening of the hollow space in a half-open mutual position in which there is a distance between the respective pairwise adjacent side walls.
  • This provides for obtaining an intermediate position between closed and open eraser, in which intermediate position the eraser material is not retained but may be removed and renewed, the eraser being concurrently not so open that a roll of eraser material in the hollow space between the two members is able to fall out.
  • the bottom of the inner member has a slit at one of the parallel sides. This makes it possible to pass the web of eraser mater- ial from a magazine roll in the hollow space between the members beyond the side wall of the inner member remote in relation to the slit, across the bottom of said member, up through the slit and around the near side wall of the inner member as compared to the slit.
  • the end of the web-shaped material will thus stretch between two of the pairwise adjacent side walls and upon pull at this end, the two members of the eraser being in their half-open mutual position, a new eraser material is pulled out from the magazine roll across the bottom of the inner member, thereby renewing the eraser material.
  • the inner member is retained in the closed position in the outer member by wedging the side walls of the inner member in between the side walls of the outer member.
  • the side walls thus serve the double purpose of retaining the web-shaped material as well as retaining the two members in their closed mutual position.
  • each of the two mem ⁇ bers includes end walls which connect the respective side walls, said end walls comprising each per se pro ⁇ jections adapted to engage projections on the adjacent end wall of the other member when the members are in their half-open mutual position.
  • one side wall of at least the outer member has a sharp and/or serrated tear edge for tearing-off a used eraser material from the material web.
  • a magnet is embedded in the external bottom face of the inner member.
  • the eraser may thus be fastened on a white- or blackboard, the basic material of which is ferromagnetic or on a ferromagnetic object in the vicinity of the board.
  • a thin, flexible layer covers the external bottom face of the inner member. In use, such a layer contributes to keep the eraser mater ⁇ ial in contact with the white- or blackboard across a substantial portion of the bottom face of the inner member.
  • the two members are separate whereas in a second embodiment they are hinged to each other and have a hinge axis extending along and close to the bottom of the inner member and along and close to the lateral walls of one pair.
  • Fig. 1 is a vertical section along the line I-I in Fig. 2 through an eraser for a white- or blackboard according to the invention, illustrated in a half-open position,
  • Fig. 2 is a section along the line II-II in Fig. 1
  • Fig. 3 is a sectional view corresponding to Fig. 2, but showing the eraser in a closed position.
  • the eraser for a white- or blackboard consists of a box of rectangular shape with an upper part 1 which as a lid fits over a lower part 2.
  • the upper part has two side walls 3 and two end walls 4.
  • the end walls 4 are provided with projections 5 designed to engage corresponding projections 6 on end walls 7 of the lower part 2.
  • the side walls 3 of the upper part diverge towards the opening of the upper part 1 and is completed by a sharpened and serrated tear edge 8.
  • the lower part 2 comprises a bottom 9, end walls 7 and side walls 10 that are relatively low in comparison with the end walls 7.
  • a slit 11 exten ⁇ ding substantially throughout the length of the eraser is provided at the bottom 9 close to one of the side walls 10.
  • the bottom 9 has a depression 12 in which a magnet is positioned.
  • the upper part 1 and the lower part 2 are dimensioned in such a manner in relation to each other that the side walls 10 of the lower part 2 may be wedged in between the divergent side walls 3 of the upper part 1 in a closed position of the white-or blackboard illustrated in Fig. 3.
  • the side walls 3 include individually an internal bulge 19 operating as stop for the side walls 10 when the upper and lower parts are pushed together to the closed position.
  • the upper part 1 and the lower part 2 may from the position illustrated in Fig. 3 be separated from one another to the position illustrated in Figs 1 and 2, in which the projections 5 and 6 on the upper part and on the lower part, respectively, engage each other and prevent complete disassembling of the eraser. Due to the flexibility of the material of the eraser it is, however, possible to curve the end walls 4 and 7, thereby totally separ ⁇ ating the components of the eraser 2.
  • Figs 2 and 3 illustrate a magazine roll 14 of a web-shaped material 15 embedded in the hollow space provided between the upper part 1 and the lower part 2 when assembled.
  • the web-shaped material which is a disposable eraser material is, as appears from Figs 2 and 3, passed from the magazine roll 14 over one side wall 10 of the lower part 2, across the bottom 9 thereof, up through slit 11 and further over the other side wall 10 of the lower part 2.
  • the upper part and the lower part are in the half-open, mutual position illustrated in Fig. 2, there is nothing to squeeze the web-shaped material 15 so as to pre- vent it from being pulled forward as illustrated by the arrow 16.
  • the upper part and the lower part are pushed together to the closed posi ⁇ tion illustrated in Fig.
  • the web-shaped material 15 is firmly squeezed between the side walls 3 of the upper part 1 and the side walls 10 of the lower part 2, thereby fastening the part of the web-shaped material 15 extending across the bottom 9.
  • the web- shaped material 15 is likewise firmly squeezed bet ⁇ ween the upper edges of the side walls 10 and the bulges 19 where the pressure and thus the squeezing force increase when the eraser in use is pressed against a white- or blackboard.
  • this por ⁇ tion of the material 15 is further tightened up at the side of the eraser where the web due to friction against the adjacent side wall 3 is passed up over the side wall and out.
  • the closed position illustrated in Fig. 3 is the use position of the eraser and in this position the eraser may thus be used for wiping a white- or black- board clean.
  • the web-shaped material 15 distend ⁇ ed across the bottom is replaced after use, the upper part and the lower part are separated, to the position illustrated in Figs 1 and 2.
  • the web-shaped material 15 is then released and its free end 17 is exposed and may- thus be caught and pulled forward until the eraser material has been replaced.
  • the upper part and the lower part are reassembled, thereby firmly squeezing the material 15 between the side walls 3 and 10, following which the used eraser material pulled out may be torn off along the closest tear edge 8.
  • the magazine roll 14 is empty, the upper part and the lower part are completely separated, following which a new roll may be placed in the white- and black ⁇ board eraser.
  • a very suit ⁇ able material is disposable mop cloth with a smooth side and a piled side.
  • the smooth side is used for wiping whereas the piled side has an elastic effect contributing when in use to keep the eraser material in contact with the white- or blackboard.
  • An example of such a disposable mop cloth is the product DERMALIN marketed by NOVODAN KEMI A/S,
  • An alternative of a material with a piled sur ⁇ face is a thin flexible layer to be applied to the external surface of the bottom 9.
  • the white- and blackboard eraser according to the present invention is in particular appropriate for wiping clean so-called whiteboards comprising a layer of paint or enamel on a steel plate.
  • the eraser may, when not in use, fasten to the board by virtue of the magnet 13 and is thus always within easy reach.
  • the eraser for white- or blackboards according to the present invention is described above with a separate upper part and a separate lower part, these parts may as well be hinged to each other, for instance by a hinge axis, as illustrated by 18 in Fig. 3, i.e. approximately coinciding with the corner between one side wall 10 and the bottom 9.
  • the above described function of the eraser would also be achieved, i.e. it would be open- able in two stages, firstly to a half-open position in which the web-shaped material 15 may be pulled for- ward to be renewed and secondly to a completely open position in which a new magazine roll 14 may be embedded.

Landscapes

  • Drawing Aids And Blackboards (AREA)

Abstract

Cet effaceur pour tableaux noirs ou blancs comprend des éléments cupuliformes interne et externes (2, 1) dont chacun présente une base pourvue de deux côtés parallèles, pratiquement droits, à partir desquels s'étend une paroi latérale (10, 3) l'élément interne (2) étant conçu pour être reçu et retenu dans l'élément externe (1) en une position fermée de sorte que les parois latérales (3, 10) sont juxtaposées paires et que les deux éléments définissent entre eux un espace creux pratiquement fermé. L'effaceur comprend en outre des moyens (5, 6) permettant de retenir les deux éléments (1, 2), de façon à empêcher l'ouverture de l'espace creux, en une position réciproque à demi-ouverte dans laquelle une distance est maintenue entre les parois latérales adjacentes appariées (3, 10).
PCT/DK1993/000052 1992-02-13 1993-02-12 Effaceur pour tableaux noirs ou blancs WO1993015919A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK176/92 1992-02-13
DK17692A DK17692D0 (da) 1992-02-13 1992-02-13 Tavlevisker

Publications (1)

Publication Number Publication Date
WO1993015919A1 true WO1993015919A1 (fr) 1993-08-19

Family

ID=8090632

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1993/000052 WO1993015919A1 (fr) 1992-02-13 1993-02-12 Effaceur pour tableaux noirs ou blancs

Country Status (3)

Country Link
AU (1) AU3493593A (fr)
DK (1) DK17692D0 (fr)
WO (1) WO1993015919A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836038A (en) * 1996-11-07 1998-11-17 Thorp; Kelly R. Magnetic mount dry eraser
DE29807569U1 (de) * 1998-04-25 1999-09-02 Walter Hebel GmbH & Co, 57548 Kirchen Vorrichtung zum Löschen von auf einer Tafel aufgebrachten Informationen
EP1543993A1 (fr) * 2003-12-19 2005-06-22 Diakonie Kork Epilepsiezentrum, Körperschaft des öffentlichen Rechts Dispositif pour le nettoyage d'un tableau en tôle d'acier revêtu

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248884A (en) * 1940-02-17 1941-07-08 Parker Wire Goods Company Sanding block
US2648863A (en) * 1950-10-13 1953-08-18 Earl N Darling Blackboard eraser

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2248884A (en) * 1940-02-17 1941-07-08 Parker Wire Goods Company Sanding block
US2648863A (en) * 1950-10-13 1953-08-18 Earl N Darling Blackboard eraser

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5836038A (en) * 1996-11-07 1998-11-17 Thorp; Kelly R. Magnetic mount dry eraser
DE29807569U1 (de) * 1998-04-25 1999-09-02 Walter Hebel GmbH & Co, 57548 Kirchen Vorrichtung zum Löschen von auf einer Tafel aufgebrachten Informationen
EP1543993A1 (fr) * 2003-12-19 2005-06-22 Diakonie Kork Epilepsiezentrum, Körperschaft des öffentlichen Rechts Dispositif pour le nettoyage d'un tableau en tôle d'acier revêtu

Also Published As

Publication number Publication date
DK17692D0 (da) 1992-02-13
AU3493593A (en) 1993-09-03

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