WO2012066505A1 - A writing board - Google Patents
A writing board Download PDFInfo
- Publication number
- WO2012066505A1 WO2012066505A1 PCT/IB2011/055174 IB2011055174W WO2012066505A1 WO 2012066505 A1 WO2012066505 A1 WO 2012066505A1 IB 2011055174 W IB2011055174 W IB 2011055174W WO 2012066505 A1 WO2012066505 A1 WO 2012066505A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- writing
- protuberances
- writing board
- protuberance
- base
- Prior art date
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
- B43L1/00—Repeatedly-usable boards or tablets for writing or drawing
- B43L1/04—Blackboards
- B43L1/10—Writing surfaces thereof
Definitions
- This invention relates to a writing board for use with a chalk writing instrument.
- any reference herein to a chalk writing instrument must be interpreted to mean a reference to a writing instrument formed of compressed particles which are rubbed off in contact with a writing surface so as to leave a mark on the writing surface.
- the chalk writing instrument may be of calcium sulphate ("chalk"), a chalk-like substance or any other substance which when provided in compressed particulate form provides a writing instrument wherein particles thereof are rubbed off to mark a writing surface when using the writing instrument to write on the writing surface.
- a writing board comprising a sheet element having a major side defining a writing surface which can be marked using a chalk writing instrument, the writing surface having a rough surface profile so as to provide an abrasive surface for rubbing off particles of chalk for marking the sheet element, the sheet element being characterised in that the writing surface defines a plurality of spaced symmetrically-shaped protuberances which are arranged in rows, a surface of a portion of the sheet element surrounding the protuberances being flat and smooth, with the spacing between the protuberances being sufficiently large so as to permit wiping of the chalk from the writing surface.
- the sheet element may define a longitudinal axis and a lateral axis which extends perpendicularly with respect to the longitudinal axis when viewed in plan view, the protuberances being arranged in a grid pattern wherein each row is parallel to one of said longitudinal or lateral axes.
- the protuberances may have the same configuration.
- Each protuberance may have a base and at least one side wall which extends outwardly from and tapers from said base.
- the spacing between adjacent sides of the bases of adjacent protuberances is less than the width of a writing end of a chalk writing instrument. In use, this spacing ensures that the writing end of a chalk writing instrument cannot pass between two adjacent protuberances without contacting the protuberances when using the chalk writing instrument to mark the sheet element.
- each protuberance may have a conical shape.
- Each protuberance may have a maximum height dimension of one half of the diameter of said base.
- Each protuberance may have a minimum height dimension of one quarter of the diameter of said base.
- each protuberance may have a pyramidal-shape. More particularly, each protuberance may have a square base. The protuberances may be disposed such that each side of the base of each pyramidal protuberance is disposed parallel to one of said longitudinal and lateral axes.
- Each protuberance may have a maximum height dimension of one half of the length of one of the sides of the base of the protuberance. Furthermore, each protuberance may have a minimum height dimension of one quarter of the length of one of the sides of the base.
- the spacing between adjacent sides of the bases of adjacent protuberances may be no less than the length of one of the sides of the base of one of the protuberances. More specifically, said spacing between the protuberances may be no greater than twice the length of one of the sides of the base of a particular one of the protuberances.
- a further factor which is taken into consideration in the determination of the spacing between the protuberances is that sufficient space must be provided between the protuberances so as to facilitate wiping clean of chalk marked on the sheet element.
- the sheet element may be of a polymer material such as polyvinylchloride, polyethylene or the like, having a smooth surface finish thereby rendering the writing surface wipeable.
- the sheet element may be of glass having a smooth surface finish thereby rendering the writing surface wipeable.
- Figure 1 shows a top plan view of a writing board in accordance with the invention
- Figure 2 shows a side view of the writing board of Figure 1 ;
- Figure 3 shows a perspective view of the writing board of Figure 1 ;
- Figure 4 shows an enlarged fragmentary perspective view of detail A of Figure 3;
- Figure 5 show a top view of another embodiment of a writing board in accordance with the invention.
- Figure 6 shows a side view of the writing board of Figure 5;
- Figure 7 shows a perspective view of the writing board of Figure 5; and Figure 8 shows an enlarged fragmentary view of detail B of Figure 7.
- a writing board in accordance with the invention is designated generally by the reference numeral 10.
- the writing board is in the form of a sheet element 12 having a major side defining a writing surface 14.
- the writing surface has a rough surface profile provided by a plurality of pyramidal-shaped protuberances 16 which are arranged in rows.
- the writing board is adapted for use with chalk writing instruments, with the rough surface profile of the writing surface providing an abrasive surface for rubbing off particles of the chalk writing instrument which are then deposited on the writing surface for marking the sheet element.
- the writing board is specifically adapted for use with a chalk writing instrument comprising a cylindrical stick of calcium sulphate (chalk) of the type typically used for writing on blackboards. Chalk is commonly used for writing on blackboards and is typically supplied in cylindrical sticks about 10cm long having a diameter of approximately 1 cm, although other shapes and sizes of chalk for writing on blackboards are also commercially available.
- chalk calcium sulphate
- the sheet element is of a polymer material such as polyvinylchloride, polyethylene or the like, which has a smooth surface finish thereby rendering the writing surface wipeable. It will be appreciated that the sheet element may be of any other suitable material such as glass having a smooth surface finish which renders the writing surface wipeable.
- the sheet element 12 defines a longitudinal axis L1 and a lateral axis L2 which extends perpendicularly with respect to the longitudinal axis when viewed in plan view.
- the protuberances 16 are arranged in a grid pattern wherein each row of protuberances is parallel to one of the longitudinal L1 or lateral axis L2.
- each of the protuberances 16 have identical shapes and configurations. More specifically, each of the protuberances has a square base defined by sides X and Y. As such, each pyramidal protuberance comprises four triangular sides which extend upwardly from the base and which terminate in an apex Z.
- each protuberance 16 are disposed such that each side X, Y of the base of each pyramidal protuberance extends in a direction parallel to one of said longitudinal and lateral axes. Furthermore, each protuberance has a maximum height dimension H which is half of the length of one of the sides X, Y of the base of the protuberance. Furthermore, each protuberance may have a minimum height H which is one quarter the length of one of the sides X, Y of the base.
- the maximum spacing between adjacent protuberances is less than the width of a writing end of a chalk writing instrument. In use, this maximum spacing ensures that the writing end of a chalk writing instrument cannot pass between two adjacent protuberances without contacting the protuberances when using the chalk writing instrument to mark the sheet element.
- the spacing (designated by the reference numerals P1 and P2 in Figure 1 of the drawings) between the protuberances 16, represented by the distance between adjacent sides X, Y of adjacent protuberances, is no less than the length of one of the sides X, Y of the base of one of the protuberances. More specifically, said spacing between the protuberances is no greater than twice the length of the side of the base of a particular one of the protuberances.
- the spacing referred to above has been determined so as to facilitate ease of wiping clean of chalk marked on the sheet element.
- FIG. 100 Another embodiment of a writing board in accordance with the invention, is designated generally by the reference numeral 100.
- the writing board 100 is similar to the writing board 10, with the only difference being that the protuberances 160 of the writing board 100 are conical in shape instead of having a pyramidal shape.
- features of the writing board 100 which are the same as and/or similar to those of the writing board 10, are designated by the same and/or similar reference numerals.
- the writing board 100 is in the form of a polymer sheet element 12 having a major writing surface 14.
- the protuberances 160 are arranged in rows in a grid pattern.
- the protuberances 16 have identical shapes with each protuberance having a maximum height dimension H of one half of the diameter of the circular base of the protuberance and a minimum height dimension H of one quarter of the diameter of the circular base thereof.
- the maximum spacing between adjacent protuberances represented by the distance between the apices Z of adjacent protuberances, is less than the width of a writing end of a chalk writing instrument.
- the spacing between adjacent sides of the bases of adjacent protuberances is no less than the diameter of one of the protuberances.
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
A writing board (10) for use with a chalk writing instrument, comprises a sheet element (12) having a major side defining a writing surface (14). The writing surface has a rough profile provided by a plurality of pyramidal - shaped protuberances (16) which are arranged in rows in a grid pattern. The protuberances provide an abrasive surface for rubbing off particles of the chalk writing instrument which are deposited onto the writing surface for marking the sheet element. The spacing between adjacent protuberances is less than the width of a chalk writing instrument thereby to ensure that the writing instrument cannot pass between two adjacent protuberances without contacting the protuberances when using the writing instrument to mark the sheet element.
Description
A WRITING BOARD
FIELD OF INVENTION This invention relates to a writing board for use with a chalk writing instrument.
Any reference herein to a chalk writing instrument must be interpreted to mean a reference to a writing instrument formed of compressed particles which are rubbed off in contact with a writing surface so as to leave a mark on the writing surface. The chalk writing instrument may be of calcium sulphate ("chalk"), a chalk-like substance or any other substance which when provided in compressed particulate form provides a writing instrument wherein particles thereof are rubbed off to mark a writing surface when using the writing instrument to write on the writing surface.
SUMMARY OF INVENTION
According to the invention there is provided a writing board comprising a sheet element having a major side defining a writing surface which can be marked using a chalk writing instrument, the writing surface having a rough surface profile so as to provide an abrasive surface for rubbing off particles of chalk for marking the sheet element, the sheet element being characterised in that the writing surface defines a plurality of spaced symmetrically-shaped protuberances which are arranged in rows, a surface of a portion of the sheet element surrounding the protuberances being flat and smooth, with
the spacing between the protuberances being sufficiently large so as to permit wiping of the chalk from the writing surface.
The sheet element may define a longitudinal axis and a lateral axis which extends perpendicularly with respect to the longitudinal axis when viewed in plan view, the protuberances being arranged in a grid pattern wherein each row is parallel to one of said longitudinal or lateral axes.
The protuberances may have the same configuration. Each protuberance may have a base and at least one side wall which extends outwardly from and tapers from said base. The spacing between adjacent sides of the bases of adjacent protuberances, is less than the width of a writing end of a chalk writing instrument. In use, this spacing ensures that the writing end of a chalk writing instrument cannot pass between two adjacent protuberances without contacting the protuberances when using the chalk writing instrument to mark the sheet element.
In one embodiment, each protuberance may have a conical shape. Each protuberance may have a maximum height dimension of one half of the diameter of said base. Each protuberance may have a minimum height dimension of one quarter of the diameter of said base.
In another embodiment, each protuberance may have a pyramidal-shape. More particularly, each protuberance may have a square base. The protuberances may be disposed such that each side of the base of each pyramidal protuberance is disposed parallel to one of said longitudinal and lateral axes.
Each protuberance may have a maximum height dimension of one half of the length of one of the sides of the base of the protuberance. Furthermore, each protuberance may have a minimum height dimension of one quarter of the length of one of the sides of the base.
The spacing between adjacent sides of the bases of adjacent protuberances, may be no less than the length of one of the sides of the base of one of the protuberances. More
specifically, said spacing between the protuberances may be no greater than twice the length of one of the sides of the base of a particular one of the protuberances.
In use, a further factor which is taken into consideration in the determination of the spacing between the protuberances is that sufficient space must be provided between the protuberances so as to facilitate wiping clean of chalk marked on the sheet element.
The sheet element may be of a polymer material such as polyvinylchloride, polyethylene or the like, having a smooth surface finish thereby rendering the writing surface wipeable. In another embodiment, the sheet element may be of glass having a smooth surface finish thereby rendering the writing surface wipeable.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features of the invention are described hereinafter by way of a non-limiting example of the invention, with reference to and as illustrated in the accompanying diagrammatic drawings. In the drawings: Figure 1 shows a top plan view of a writing board in accordance with the invention;
Figure 2 shows a side view of the writing board of Figure 1 ;
Figure 3 shows a perspective view of the writing board of Figure 1 ;
Figure 4 shows an enlarged fragmentary perspective view of detail A of Figure 3;
Figure 5 show a top view of another embodiment of a writing board in accordance with the invention;
Figure 6 shows a side view of the writing board of Figure 5;
Figure 7 shows a perspective view of the writing board of Figure 5; and
Figure 8 shows an enlarged fragmentary view of detail B of Figure 7.
DETAILED DESCRIPTION OF THE DRAWINGS
With reference to Figures 1 to 4 of the drawings, a writing board in accordance with the invention, is designated generally by the reference numeral 10. The writing board is in the form of a sheet element 12 having a major side defining a writing surface 14. The writing surface has a rough surface profile provided by a plurality of pyramidal-shaped protuberances 16 which are arranged in rows.
The writing board is adapted for use with chalk writing instruments, with the rough surface profile of the writing surface providing an abrasive surface for rubbing off particles of the chalk writing instrument which are then deposited on the writing surface for marking the sheet element. In this example, the writing board is specifically adapted for use with a chalk writing instrument comprising a cylindrical stick of calcium sulphate (chalk) of the type typically used for writing on blackboards. Chalk is commonly used for writing on blackboards and is typically supplied in cylindrical sticks about 10cm long having a diameter of approximately 1 cm, although other shapes and sizes of chalk for writing on blackboards are also commercially available.
The sheet element is of a polymer material such as polyvinylchloride, polyethylene or the like, which has a smooth surface finish thereby rendering the writing surface wipeable. It will be appreciated that the sheet element may be of any other suitable material such as glass having a smooth surface finish which renders the writing surface wipeable.
The sheet element 12 defines a longitudinal axis L1 and a lateral axis L2 which extends perpendicularly with respect to the longitudinal axis when viewed in plan view. As such, the protuberances 16 are arranged in a grid pattern wherein each row of protuberances is parallel to one of the longitudinal L1 or lateral axis L2.
The protuberances 16 have identical shapes and configurations. More specifically, each of the protuberances has a square base defined by sides X and Y. As such, each
pyramidal protuberance comprises four triangular sides which extend upwardly from the base and which terminate in an apex Z.
The protuberances 16 are disposed such that each side X, Y of the base of each pyramidal protuberance extends in a direction parallel to one of said longitudinal and lateral axes. Furthermore, each protuberance has a maximum height dimension H which is half of the length of one of the sides X, Y of the base of the protuberance. Furthermore, each protuberance may have a minimum height H which is one quarter the length of one of the sides X, Y of the base.
The maximum spacing between adjacent protuberances, represented by the distance between the apices Z of adjacent protuberances, is less than the width of a writing end of a chalk writing instrument. In use, this maximum spacing ensures that the writing end of a chalk writing instrument cannot pass between two adjacent protuberances without contacting the protuberances when using the chalk writing instrument to mark the sheet element.
More specifically, in a preferred embodiment, the spacing (designated by the reference numerals P1 and P2 in Figure 1 of the drawings) between the protuberances 16, represented by the distance between adjacent sides X, Y of adjacent protuberances, is no less than the length of one of the sides X, Y of the base of one of the protuberances. More specifically, said spacing between the protuberances is no greater than twice the length of the side of the base of a particular one of the protuberances. The spacing referred to above has been determined so as to facilitate ease of wiping clean of chalk marked on the sheet element.
It will be appreciated that the angular configuration of the pyramidal-shaped protuberances which provides four edges between the four sides of each protuberance, which cut into a chalk writing instrument so as to remove chalk particles from the writing instrument.
With reference to Figures 5 to 8 of the drawings, another embodiment of a writing board in accordance with the invention, is designated generally by the reference numeral 100. The writing board 100 is similar to the writing board 10, with the only difference being
that the protuberances 160 of the writing board 100 are conical in shape instead of having a pyramidal shape. As such, features of the writing board 100 which are the same as and/or similar to those of the writing board 10, are designated by the same and/or similar reference numerals. The writing board 100 is in the form of a polymer sheet element 12 having a major writing surface 14. The protuberances 160 are arranged in rows in a grid pattern.
The protuberances 16 have identical shapes with each protuberance having a maximum height dimension H of one half of the diameter of the circular base of the protuberance and a minimum height dimension H of one quarter of the diameter of the circular base thereof. The maximum spacing between adjacent protuberances represented by the distance between the apices Z of adjacent protuberances, is less than the width of a writing end of a chalk writing instrument. Furthermore, optimally, in order to facilitate ease of wiping clean the writing surface, the spacing between adjacent sides of the bases of adjacent protuberances, is no less than the diameter of one of the protuberances.
Claims
1 . A writing board comprising a sheet element having a major side defining a writing surface which can be marked using a chalk writing instrument, the writing surface having a rough surface profile so as to provide an abrasive surface for rubbing off particles of chalk for marking the sheet element, the sheet element being characterised in that the writing surface defines a plurality of spaced symmetrically-shaped protuberances which are arranged in rows, a surface of a portion of the sheet element surrounding the protuberances being flat and smooth, with the spacing between the protuberances being sufficiently large so as to permit wiping of the chalk from the writing surface.
2. The writing board as claimed in claim 1 , wherein the sheet element defines a longitudinal axis and a lateral axis which extends perpendicularly with respect to the longitudinal axis when viewed in plan view, the protuberances being arranged in a grid pattern wherein each row is parallel to one of said longitudinal or lateral axes.
3. The writing board as claimed in claim 1 or claim 2, wherein the protuberances have the same configuration.
4. The writing board as claimed in claim 3, wherein each protuberance has a base and at least one side wall which extends outwardly from and tapers from said base.
5. The writing board as claimed in claim 4, wherein the spacing between adjacent sides of the bases of adjacent protuberances, is less than the width of a writing end of a chalk writing instrument.
6. The writing board as claimed in claim 4, wherein each protuberances has a conical shape.
The writing board as claimed in claim 6, wherein each protuberance has maximum height dimension of one half of the diameter of said base.
8. The writing board as claimed in claim 6, wherein each protuberance has a minimum height dimension of one quarter of the diameter of said base.
9. The writing board as claimed in claim 4, wherein each protuberance has a pyramidal shape.
10. The writing board as claimed in claim 9, wherein each protuberance has a square base.
1 1 . The writing board as claimed in claim 10, wherein the protuberances are disposed such that each side of the base of each pyramidal protuberance is disposed parallel to one of said longitudinal and lateral axes.
12. The writing board as claimed in claim 1 1 , wherein each protuberance has a maximum height dimension of one half of the length of one of the sides of the base of the protuberance.
13. The writing board as claimed in claim 12, wherein each protuberance has a minimum height dimension of one quarter of the length of one of the sides of the base.
14. The writing board as claimed in claim 1 , wherein the sheet element is made of one of a polymer and glass having a smooth surface finish rendering the writing surface wipeable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA201008333 | 2010-11-19 | ||
| ZA2010/08333 | 2010-11-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012066505A1 true WO2012066505A1 (en) | 2012-05-24 |
Family
ID=45315855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2011/055174 WO2012066505A1 (en) | 2010-11-19 | 2011-11-18 | A writing board |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012066505A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700328A (en) * | 2012-06-28 | 2012-10-03 | 丘志敏 | Teaching tablet with writing grid groove |
| CN102700325A (en) * | 2012-06-28 | 2012-10-03 | 丘志敏 | Teaching writing plate with writing lattices and cleaning brush |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2541497A (en) * | 1950-07-28 | 1951-02-13 | Royal Tot Mfg Company | Writing board |
| US3574956A (en) * | 1967-11-17 | 1971-04-13 | Robert Hamelin | Writing support |
| DE1786323A1 (en) * | 1968-09-17 | 1971-12-30 | Wolfgang Tiesler | School blackboard writing surface |
| US5200853A (en) * | 1991-10-31 | 1993-04-06 | Opher Berkman | Board for screening and writing and a method for the production thereof |
| JP2007253604A (en) * | 2006-02-22 | 2007-10-04 | Sakura Color Prod Corp | Writing sheet and pastel crayon/crayon sheet |
| DE202009007928U1 (en) * | 2009-06-06 | 2009-10-22 | Apel, Uwe | Changeable and reusable writing pad |
-
2011
- 2011-11-18 WO PCT/IB2011/055174 patent/WO2012066505A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2541497A (en) * | 1950-07-28 | 1951-02-13 | Royal Tot Mfg Company | Writing board |
| US3574956A (en) * | 1967-11-17 | 1971-04-13 | Robert Hamelin | Writing support |
| DE1786323A1 (en) * | 1968-09-17 | 1971-12-30 | Wolfgang Tiesler | School blackboard writing surface |
| US5200853A (en) * | 1991-10-31 | 1993-04-06 | Opher Berkman | Board for screening and writing and a method for the production thereof |
| JP2007253604A (en) * | 2006-02-22 | 2007-10-04 | Sakura Color Prod Corp | Writing sheet and pastel crayon/crayon sheet |
| DE202009007928U1 (en) * | 2009-06-06 | 2009-10-22 | Apel, Uwe | Changeable and reusable writing pad |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700328A (en) * | 2012-06-28 | 2012-10-03 | 丘志敏 | Teaching tablet with writing grid groove |
| CN102700325A (en) * | 2012-06-28 | 2012-10-03 | 丘志敏 | Teaching writing plate with writing lattices and cleaning brush |
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