GB2040784A - Plastic drawing instruments - Google Patents
Plastic drawing instruments Download PDFInfo
- Publication number
- GB2040784A GB2040784A GB7913325A GB7913325A GB2040784A GB 2040784 A GB2040784 A GB 2040784A GB 7913325 A GB7913325 A GB 7913325A GB 7913325 A GB7913325 A GB 7913325A GB 2040784 A GB2040784 A GB 2040784A
- Authority
- GB
- United Kingdom
- Prior art keywords
- instrument
- roughening
- mould
- ruler
- plastic drawing
- 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
Links
- 229920003023 plastic Polymers 0.000 title claims abstract description 6
- 239000004033 plastic Substances 0.000 title claims abstract description 6
- 238000007788 roughening Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 3
- 238000009760 electrical discharge machining Methods 0.000 claims description 2
- 238000001259 photo etching Methods 0.000 claims description 2
- 238000005488 sandblasting Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 230000004313 glare Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 2
- 230000004438 eyesight Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- B43L7/00—Straightedges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
- B29C33/424—Moulding surfaces provided with means for marking or patterning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
- B29K2995/0024—Matt surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/752—Measuring equipment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Drawing Aids And Blackboards (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A plastic drawing instrument for drawing lines, such as a set-square, ruler, curve, produced by means of moulding is characterised in that at least one of its surfaces is made opaque by means of roughening the surface of the mould in which the instrument is moulded to thereby eliminate glare caused by the reflection of light. <IMAGE>
Description
SPECIFICATION
Plastic drawing instruments
The present invention relates to plastic drawing instruments for drawing lines, such as set-squares, rulers, curves, etc., produced by means of moulding.
A disadvantage of such drawing instruments is that the glare caused by the reflection of light on their surface causes noticeable disturbance to the vision of the person using them.
The present invention proposes to eliminate this disadvantage. More particularly, the plastic drawing instrument according to the invention is characterised in that it has at least one surface made opaque by means of roughening the surface of the mould in which the instrument is moulded.
The invention will be better understood from the following description, which is given purely by way of example and is therefore non-limiting, of one construction form thereof, with reference to the single Drawing.
Figure 1 is a plan view of a drawing ruler according to the invention.
Figure 2 is a transverse section through part of the ruler shown in Figure 1, on a much larger scale.
Figure 1 shows a drawing ruler with a scale 2, which forthe sake of simplification, is reproduced only in part, on one section of the ruler. The surface 3 of the ruler which is facing the observer is dotted to indicate that it has been made opaque so as not to dazzle the draughtsman with light reflected from it.
In Figure 2 it can be seen that the surface 3 has a series of very small projections 4 which make it rough. This roughening of the surface is obtained by roughening the surface of the mould in which the ruler is moulded. The roughening of the surface of the mould may be accomplished in various ways, for example, by sand-blasting, photo-etching, sparkerosion, etc.
A surface roughened in this way reduces reflection to a minimum since the rays of light striking this surface are reflected in an infinite number of directions and are partly absorbed so that only a minimal part of them is perceived by the person looking at the drawing instrument The draughtsman is not therefore disturbed as he works by the reflexion originating from the instrument which he is using.
Generally, to obtain the desired effect it is sufficient to make the surface opaque on only one side of the drawing instrument. However, if desired, the instrument may be made opaque on the surfaces of both opposing sides and also the edge surfaces.
Although only one construction form of the invention has been described, naturally it is possible to effect numerous variations and modifications without exceeding the scope of the said invention.
Claims (5)
1. A drawing instrument made of plastics material for drawing lines, produced by means of moulding, characterised in that it has at least one surface made opaque by means of roughening the surface of the mould in which the instrument is moulded.
2. An instrument according to Claim 1, characterised in that the roughening of the surface of the mould is obtained by sand-blasting.
3. An instrument according to Claim 1, characterised in that the roughening of the surface of the mould is obtained by photo-etching.
4. An instrument according to Claim 1, characterised in that the roughening of the surface of the mould is obtained by spark erosion.
5. A ruler constructed and arranged substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT7919284A IT7919284A0 (en) | 1979-01-15 | 1979-01-15 | PLASTIC DRAWING TOOL FOR TRACING LINES WITH A MATT SURFACE TO MINIMIZE REFLECTION. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2040784A true GB2040784A (en) | 1980-09-03 |
| GB2040784B GB2040784B (en) | 1983-01-12 |
Family
ID=11156399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7913325A Expired GB2040784B (en) | 1979-01-15 | 1979-04-17 | Plastic drawing instruments |
Country Status (5)
| Country | Link |
|---|---|
| DE (2) | DE7914506U1 (en) |
| ES (1) | ES242709Y (en) |
| FR (1) | FR2446190A1 (en) |
| GB (1) | GB2040784B (en) |
| IT (1) | IT7919284A0 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2553038A1 (en) * | 1983-10-10 | 1985-04-12 | Tassin Robert | Ellipse drawing aid with wire loop |
| EP0805052A1 (en) * | 1995-10-30 | 1997-11-05 | Zebra Co., Ltd. | Writing materials |
| CN1063394C (en) * | 1997-01-31 | 2001-03-21 | 台湾三条股份有限公司 | Method for mfg. tape made of glass fiber with high stretching resistance |
| WO2018027268A1 (en) * | 2016-08-09 | 2018-02-15 | Luke Deane Etheredge | Device for use with laser alignment devices |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3032347A1 (en) * | 1980-08-28 | 1982-04-15 | Gebr. Happich Gmbh, 5600 Wuppertal | METHOD FOR PRODUCING AN EXTRUDED PLASTIC PROFILE BAR AND DEVICE FOR CARRYING OUT THE METHOD |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE667286A (en) * | ||||
| US2563191A (en) * | 1950-07-31 | 1951-08-07 | Raymond W Russ | Illuminated draftsman's guide |
| FR1075261A (en) * | 1953-01-08 | 1954-10-14 | Quenot Et Cie Ets | Linear articulated measurements, single and double-meter or approximate measurements, made of plastics of any kind |
| FR1130540A (en) * | 1955-08-23 | 1957-02-06 | Improvement in graduated rulers and similar instruments | |
| FR1191549A (en) * | 1958-02-14 | 1959-10-20 | Improvements to the rules to draw lines | |
| FR1240770A (en) * | 1959-10-13 | 1960-09-09 | Plastic slate | |
| FR1568891A (en) * | 1968-02-13 | 1969-05-30 |
-
1979
- 1979-01-15 IT IT7919284A patent/IT7919284A0/en unknown
- 1979-04-16 ES ES1979242709U patent/ES242709Y/en not_active Expired
- 1979-04-17 GB GB7913325A patent/GB2040784B/en not_active Expired
- 1979-05-07 FR FR7912132A patent/FR2446190A1/en active Granted
- 1979-05-18 DE DE19797914506U patent/DE7914506U1/en not_active Expired
- 1979-05-18 DE DE19792920225 patent/DE2920225A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2553038A1 (en) * | 1983-10-10 | 1985-04-12 | Tassin Robert | Ellipse drawing aid with wire loop |
| EP0805052A1 (en) * | 1995-10-30 | 1997-11-05 | Zebra Co., Ltd. | Writing materials |
| EP0805052A4 (en) * | 1995-10-30 | 1998-03-18 | Zebra Co Ltd | Writing materials |
| CN1063394C (en) * | 1997-01-31 | 2001-03-21 | 台湾三条股份有限公司 | Method for mfg. tape made of glass fiber with high stretching resistance |
| WO2018027268A1 (en) * | 2016-08-09 | 2018-02-15 | Luke Deane Etheredge | Device for use with laser alignment devices |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7919284A0 (en) | 1979-01-15 |
| FR2446190A1 (en) | 1980-08-08 |
| ES242709U (en) | 1979-07-01 |
| GB2040784B (en) | 1983-01-12 |
| FR2446190B1 (en) | 1984-12-14 |
| DE2920225A1 (en) | 1980-07-17 |
| DE7914506U1 (en) | 1983-01-13 |
| ES242709Y (en) | 1979-12-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960417 |