+

WO2018139915A1 - Instrument de dessin - Google Patents

Instrument de dessin Download PDF

Info

Publication number
WO2018139915A1
WO2018139915A1 PCT/MY2017/000042 MY2017000042W WO2018139915A1 WO 2018139915 A1 WO2018139915 A1 WO 2018139915A1 MY 2017000042 W MY2017000042 W MY 2017000042W WO 2018139915 A1 WO2018139915 A1 WO 2018139915A1
Authority
WO
WIPO (PCT)
Prior art keywords
point
interval
line
pivot hole
instrument
Prior art date
Application number
PCT/MY2017/000042
Other languages
English (en)
Inventor
Prebasubah RAMALINGGAM
Original Assignee
KALIMUTHU, Kalaichelvan
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 KALIMUTHU, Kalaichelvan filed Critical KALIMUTHU, Kalaichelvan
Publication of WO2018139915A1 publication Critical patent/WO2018139915A1/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
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/002—Circular curve-drawing or like instruments with perforated or marked discs
    • 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
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/007—Circular curve-drawing or like instruments with perforated or marked rulers

Definitions

  • the present invention relates to a drawing instrument. More particularly it relates to a drawing instrument with improved features that facilitate drawings.
  • a user using old method or conventional way hunts his instrument-box for a particular triangle, compass, straightedge, protractor or compass to measure a particular angle or to construct a desired angle.
  • the object of the present invention is tree of movable parts and improves speed in which users learn to measure, draw and obtain answers of different level of mathematical topics in more convenient way.
  • FIG.1A, 1B, 1C, 1D, 1E & 1 F The conventional way to draw a reflected image (103) from an object (101), is illustrated in Fig .1A, 1B, 1C, 1D, 1E & 1 F.
  • the figures shows how users use set square and ruler in order to draw the desired drawings.
  • the description below shows how user currently draw reflected images and marks the points of intersect for angle (90°) on the reflection axis illustrated in FIG 1 B.
  • FIG .1 C the measurement is taken from origin point P to the reflection axis using ruler and marks the other side of the line FIG IE.
  • the above steps are repeated for other vertices.
  • the reflected image of FIG 1 F is drawn.
  • the conventional way to construct the centre of rotation (201) illustrated in FIG 2 A, 2B, 2C, 2D, 2E and 2F requires a ruler, compass and protractor.
  • a ruler By using a ruler, user draws a joining line of vertex B and B' in FIG 2B and then uses a compass to construct the perpendicular bisector as in FIG 2C. The point of intersect is obtained from the compass and line is drawn FIG 2D.
  • the same steps above are repeated for vertex C and C; and the intersection of perpendicular bisector line is the centre of rotation FIG 2E.
  • a protractor is used to confirm the angle. When using mis improved invention the answer is obtained in a single measurement and requires less time.
  • FIG 3A, 3B, 3C and 3D The description below explains the current way of drawing image illustrated in FIG 3A, 3B, 3C and 3D.
  • These steps require users to pick up ruler, compass and protractor at different time and draw lines based on its requirement.
  • the above steps are repeated for other vertices in the picture FIG 3A .
  • This way of drawing image in FIG 3A is time consuming and requires various tools.
  • FIG 1, FIG 2 and FIG 3 generally suffer the disadvantages of inefficiency, resulting the need to use more man one instrument, whereby the instruments are required to move back and forth from one instrument to the other, in order to complete the operation and the given task.
  • the embodiment significantly improves an overall student comprehension on Mathematics and reduces the time to teach students on how to understand mathematical concept and principle which can be demonstrated graphically by methods of drawing different aspects in transformation, drawing circles, tangenial line and obtaining centre of circle which has not been demonstrated yet for school students, using a set square.
  • the invention is not only for students and teachers, but it also caters for professional draftsmen and architects as a drafting tools, who expect precision and accuracy in their tasks.
  • a drawing instrument comprising: a first side that is perpendicularly connected to a second side; a third side that is connected to the first side and/or the second side forming a set or a body of the instrument.
  • Each of the sides includes an edge for drawing a line and measuring a distance. The edge may be beveled and marked with measurements, scales or intervals.
  • a line with interval points or holes is provided on the instrument as a compass line.
  • the line maybe disposed on any one of the sides for drawing a circle.
  • the line with interval points includes a first point B with an interval that is 2 times of a predetermined distance or measurment value from an initial point or a starting point A.
  • the predetermined distance value is 0.1cm which results in the point B that is 2 times of the value which results in an interval of 0.2cm from the initial point A; a second point F with an interval that is 3 times of the value which results in an interval of 0.3cm from the initial point A.
  • the initial point A is preferably marked as '0' or '0.0' .
  • the series further includes a third point G with an interval that is 5 times of the value, which results in an interval of 0.5cm from the initial point A.
  • the third point G includes an interval that is 2 times of the value which results in an interval of 0.2cm from the second point F.
  • the series further includes a fourth point H with an interval of 10 times of the value which results in an interval of 1.0cm from the initial point A.
  • the series further includes a fifth point I with an interval that is 5 times of the value which result in an interval of 0.5cm from the fourth point H. These interval points may be parallel to any one of the sides.
  • the drawing instrument further comprising a first pivot hole disposed at a vertex which is the connection point of the first side and second side; and a second pivot hole mat is in line with the first pivot hole and disposed on a mid-point of the third side.
  • the drawing instrument further comprising an internal slit within the set which is parallel to the third side forming a fourth side.
  • the drawing instrument further comprising an internal curved edge to act as a protractor wherein the curved edge includes intervals or scales for an angular measurement and a third pivot hole disposed on a mid-point of the fourth side to act as the centre rotation of the protractor.
  • the above features such as number of lines, scales, holes and marks, aligned in accordance; whereby it correlates and overlaps' with one another to facilitate speed, accuracy and solve multiple solutions simultaneously.
  • the bevels along the edges of the instrument is to avoid most of the effects of reflection and refraction of lines and scales underside of the ruler.
  • the thickness of the instrument may be greater or less width from one* twentieth to one-fourth of an inch thickness, depending on the length of the ruler.
  • the length of the sides may vary. For example, each side may have a length of twelve centimetre, or more depending on the requirement
  • a hemispheric bumper is integrally formed with the body of the instrument.
  • One or more hemispheric bumpers may be provided below the instrument. Raising the instrument above the drafting surface facilitates movement and eliminates smearing of ink under the instrument and between it edges, as well as reduces friction associated with sliding of the instrument on the drafting surface.
  • the height of the first pivot hole allows users to place a marking device such as a pencil on the paper through the hole in order to mark the centre point of rotation.
  • the first pivot hole acts as a centre of rotation and to draw 90° images based on the given object.
  • Positioned at the intersection of perpendicular line between the first and second sides it allows users to measure, mark and rotate the instrument about the centre of rotation using the first pivot hole.
  • the principle feature of the first pivot hole marks the combination of perpendicular angle and the uniform bisector measurement between the first and second sides. This feature significantly saves time and is used in constructing image for 90° rotation and finding centre of rotation between two images under 90° rotation. Besides that, it also assists to find the centre of rotation from two images under any angle (0°) of rotation, to draw the reflection axis from two images and to draw lines of intersection for centre of circle.
  • the height of a second pivot hole allows user to place a marking device such as a pencil on the paper through the hole in order to mark the centre point of rotation and to measure uniform bisector measurement along the third side.
  • the second pivot hole is positioned in a mid-point of the third side.
  • the second pivot hole acts and marks as a centre of rotation to draw 180° rotation images based on the given object wherein the hole allows users to measure, mark and rotate about the centre of rotation.
  • the second pivot hole marks the uniform bisector measurement between a first section and second section of the third side.
  • These third pivot hole and third side significantly saves time and is used in constructing image for 180° rotation , finding centre of rotation between two images under 180° rotation, constructing images under reflection, finding reflection axis from given two images and constructing parallel line.
  • the third side may be provided with numeral intervals with the second pivot hole acts as the initial or starting point for measurement.
  • a line perpendicular to the third side may be provided, This perpendicular line together with the third side allow users to find centre of rotation from two images under unspecified angle of rotation ( ⁇ °), constructing images from reflection line, finding reflection axis from two images, and constructing parallel line.
  • the perpendicular line extends from the vertex or the first pivot hole to the second pivot hole.
  • the third pivot hole is located on the intersection between the perpendicular line and the fourth side. Hie height of the third pivot hole allows users to place the marking device such as a pencil on the paper through the hole for marking the centre point of protractor and to measure uniform bisector measurement along the forth side.
  • the hole acts and marks as a pivot point of rotation, to draw images of any angle of rotation based on the object that allow users to measure, mark and rotate about the centre of rotation using the hole.
  • Hie principle feature of the third hole is to mark the centre point of protractor, a rotating centre dial for all vertex points in the diagram.
  • the third pivot hole is in line with the bottom left edge and a bottom right edge of the slit which creates a uniform bisector measurement to the fourth side and to the protractor along with the perpendicular line.
  • This third pivot hole significantly saves time and is used in constructing images for any angle of rotation ( ⁇ °), finding centre of circles of various diameter and constructing tangenial line from a given point on the circle. Besides that, it also assists to find the centre of rotation from two images constructed from unspecified angle of rotation ( ⁇ °) and constructing parallel line.
  • the internal curved edge that acts as a protractor may be formed by a cut-out of a semi-circle from the body of the instrument leaving an opening.
  • a perpendicular ruler may be provided on the perpendicular line and the operiing. It may extend from the fourth side which may devide the opening into two areas.
  • One end of the internal curved edge may connects to a first upper edge of the slit and the other end connects to a second upper edge of the slit.
  • the line with interval points is in the form of a line.
  • the series allows user to draw a circle and construct an angle. Any one hole of the series may act as a centre point of a circle and a corresponding hole may act as a moving point which draws the circumference of a circle.
  • a fourth pivot hole is provided on the perpendicular line which is between the first pivot hole and the third pivot hole.
  • the fourth pivot hole acts as a reference point and an additional point to mark on the paper in order to increase the accuracy of the drawing. Examples of the operation that can be performed using the present invention include:
  • the above operations may be performed with the aid of at most only a ruler and one or two pencils.
  • FIG 1A; FIG IB; FIG 1C; FIG ID, FIG IE, FIG IF shows the manner of using a conventional set square and ruler of prior art to draw reflected image.
  • FIG 2A; FIG 2B; FIG 2C, FIG 2D, FIG 2E, FIG 2F shows the manner of using a conventional ruler, compass & protractor of prior art to find and draw the centre of rotation;
  • FIG 3 A; FIG 3B; FIG 3C, FIG 3D shows the manner of using a conventional set square and ruler of prior art to find and draw an image based on 90° rotation;
  • Fig. 4a is a plan view of an example of the drafting instrument according to an embodiment the present invention of the invention.
  • Fig. 4b is a plan view of another example of the drafting instrument according to another embodiment the present invention of the invention.
  • Fig. Sa is an example of a line with interval points or compass line according to the present invention of the invention.
  • Fig. Sb is another example of a line with interval points or compass line according to the present invention of the invention.
  • Fig. 6 is a cross-section of the the drawing instrument adjacent to the vertex
  • Fig. 7 is a cross-section the drawing instrument adjacent to the third side
  • Fig. 8 is a cross-section view of the slit
  • Fig. 9 shows a plan view of an example of the drafting instrument according to an embodiment the present invention of the invention.
  • Fig. 10 shows a plan view of another example of the drafting instrument according to an embodiment the present invention of the invention.
  • Fig. 11 shows a plan view of an example of the drafting instrument according to an embodiment the present invention of the invention.
  • Fig. 12 shows a plan view of an example of the drafting instrument according to an embodiment the present invention of the invention. DETAILED DESCRIPTION OF THE INVENTION
  • Fig.4a shows an example of the drawing instrument (10) according to an embodiment of the present invention.
  • the drawing instrument comprises a first side (401) perpendicularly connected to a second side (402) forming a right angle; a third side (403) connected to the first side (401) and/or second side (402) forming a set or a set. of body for drawing a line and measuring a distance.
  • Each of the sides (401, 402, 403) includes a straight edge. The edge may be beveled and marked with measurement or numeral intervals.
  • a line with interval points (407) or a compass line is provided on the instrument.
  • the line (407) may be disposed on any one of the sides (401 , 402, 403) for drawing a circle.
  • the line (407) is disposed on the first side (401) of the instrument.
  • the line is straight and parallel to the edge of the first side (401).
  • the drawing instrument further comprising a first pivot hole (412) disposed at the connection point of the first side (401) and second side (402); and a second pivot hole (416) that is in line with the first pivot hole (412) and disposed on a mid-point of the third side (3).
  • Fig. 4b shows another example of the drawing instrument (20).
  • the drawing instrument includes an internal slit (431) and at least an opening forming a fourth side (404), an internal curved edge (422) to act as protractor and a perpendicular ruler (440).
  • the internal slit (431) is parallel to the third side (403).
  • the protractor (422) is formed by a curvature which includes interval points for an angular measurement. The curvature may be a cut-out of semi-circle.
  • a third pivot hole (415) disposed on a mid-point of the fourth side (404).
  • the perpendicular ruler may be provided as an option on the instrument.
  • the parallel ruler may extend from the fourth side following the perpendicular line (406) through the semi-circle cut and toward the internal (422).
  • Fig. 8 show a cross section of instrument at the slit (431).
  • the edge of slit which is the edge of the fourth side (404) is bevel having a slanting surface (82).
  • the other edge of the slit is curved (84).
  • the line with interval points includes a first point B with interval of 0.2cm and a second point F with interval of 0.3 cm from an initial or starting point A.
  • the initial point A is preferably marked as '0' or '0.0' as shown in Fig. 5b.
  • the series further includes a third point G with interval 0.5cm from the initial point A.
  • the third point G may be measured with interval of 0.2cm from the second point F.
  • the series further includes a fourth point H with interval of 1.0 cm from the initial point A.
  • the series further includes a time accurately without lifting up the present invention or use other devices. Even when the starting point is lost, the reference is regained by using the perpendicular line (406) or 90 degree line of the protractor.
  • the first (401), second side (402), first pivot hole (412) and perpendicular line (406) permits the construction of image for 90 degree rotation and provide an improved facility to find centre of rotation based from two images of 90° rotation.
  • the protractor may include two separate scales.
  • the first scale (924) starts anticlockwise from the right hand side starting at the right upper edge (947) of the slit along the curved edge (422) until the left upper edge (948), while the second scale (923) starts clockwise from the left hand side starting at the left upper edge (948) until the right upper edge (947).
  • the third pivot hole (415) acts as the centre point of the protractor, which will translate angular measurement and further cooperates with the fourth side (404) along its portion edges (919, 920) which aligns itself with respect to the circumference of circle to assist and to create tangenial line, to determine centre of circle and drawing images of different angular rotations.
  • Said scales ranging from 3° to 177° with increment of 1 degree.
  • the instrument can be used as a protractor to measure and mark off selected degrees of a circle or an arc of a circle or any angle.
  • the third pivot hole (415) of the instrument is placed on the point of circle or at the vertex or at the any point on the line. Then the arc or angle can be measured or marked, using a marking instrument to the nearest one degree along the curved edge (422) or line (923).
  • the protractor is used in the following manner where to measure an angle formed by two lines, the portion edge (919,920) of the fourth side (404) is laid along one of the lines with the angle between the lines may then be read directly from the point of crossing of the second line with the protractor scale.
  • the body of the drawing instrument includes a first area (908) and a second area (909) which may be formed by a cut-out of a semi-cicle and/or divided by a perpendicular ruler (440).
  • the portion edge (919) of the fourth side (404) starts its zero mark from the third pivot hole (415) with increments, preferably of 1 mm.
  • the portion edge (920) starts its zero mark from the third pivot hole (415) with numeral increments, preferably of 1mm .
  • Constructing various angles and parallel lines whether vertical, horizontal or oblique and other lines can easily be constructed using correct fifth point I with interval of O.Scm from the fourth point H.
  • the line with the interval points maybe parallel to any one of the sides.
  • Fig. Sb show another example of the series. As shown in Fig. Sa and Fig.
  • the interval points are in the form of holes.
  • the edges of the instrument are marked with numerical interval, scales for measurement.
  • Fig. 6 and Fig. 7 show a hemispheric bumper (45) is integrally formed with the body of the instrument.
  • One or more hemispheric bumpers (45) may be provided on the instrument. Raising the instrument above the drafting surface facilitates movement and eliminates smearing of ink under the instrument and its sides.
  • a line (406) perpendicular to the third side (3) may be provided as shown in Fig. 4a and Fig. 4b.
  • This perpendicular line (406) together with the third side (403) allow users to find a centre of rotation from two images from unspecified angle of rotation, constructing images from reflection line, finding reflection axis from two images, and constructing parallel line.
  • the line (406) extends from the vertex or the first pivot hole (412) to the second pivot hole (416).
  • the first pivot hole (412) acts as the starting zero for the first and second sides (401, 402).
  • the second pivot hole (416) acts as the starting point for the third side (403) and the third pivot hole (415) acts as the starting point for the fourth side (404).
  • the edges of the instrument are marked with numerical intervals or scales for measurement. For example, the intervals of lmm may be provided.
  • the first relationship of the perpendicular line (406) correlates to the fourth side (404) at perpendicular angle 90°marked at the third pivot hole (415) which acts as the centre point of the protractor (422) and the fourth side (404).
  • Perpendicular Line (406) also marks the centre point of the third hole (415) for the ruler on the fourth side (404) on which having uniform increment of measurement starting from zero from the third pivot hole (415) .
  • perpendicular line (406) connects and correlates to the third side (403) at perpendicular angle 90°and acts as the centre point of the third side (403) from the second pivot hole (416) which having uniform increment of measurement, starting from zero from the second pivot hole (416). All the two relationship are lined up and correlated to each other to permit users to obtain, locate and able to multitask at one specific techniques.
  • the angle can be calculated and drawn by their relationship with the measurement values of the fourth side (404), pivot hole (416) and protractor scales (422, 923, 924).
  • the relationship of the fourth side (404) is correlated to protractor (422) while the third pivot hole (415) acts as the centre point of the protractor scales are lined up this way to permit users to obtain, locate and accurately multitask at one time which facilitates constructing image of any angle of rotation, finding centre of circles of various diameter and constructing tangenial line from a given point on the circumference of circle.
  • the starting zero of the third side (403) is from the second pivot hole (416) corresponds to numeral increments of 1mm with full-scale ruler.
  • the third side (403) also acts as a 90° line towards the perpendicular line (406).
  • the line with the interval points (407) act as a compass line which permits a user to precisely draw circle and the transparency of the instrument permits the user to readily view it with an adjustable radius in every one tenth of a centimetre within the range of scale.
  • the adjustment of the radius is accomplished by adding the values in Line 407 for the desired radius or length value.
  • a circle can be formed by moving one hand around and the other hand stationary which acts as the centre of circle.
  • the compass line (407) has a centering hole for the insertion of a pin, sharp pencil, nails or other object similar character to act as pivot when the tool is used as a compass. As shown in Fig.
  • the compass line (407) can be divided into a first section, a second section and a third section which corresponding to particular points or holes.
  • the first section (610) comprising holes or points A, B, C, D, and E with an interval 0.2cm between the points.
  • the second section (630) comprising holes or points A, F and G wherein F has an interval of 0.3 cm from point A and O has an interval of 0.5 from point A.
  • the third section (607) includes a plurality of holes or points with an interval of 0.5 between the holes.
  • the tine (407) includes instrument the first section (610) that is positioned at a top and followed by the second section (630) and third section (607).
  • the second section (630) is positioned at a top and followed by the first section (610) and the third section (607).
  • Any one hole or point in the first section (610) and second section (630) can be used or marked as a centering point with another hole in the section be used as a second point for drawing a cirle.
  • the radius of the circle may vary depending on the interval or hole of the second point. Pin, pencil or any pointed article can be used to mark the point through the hole.
  • Any one hole in the third section (607) can be used as the second point for drawing a bigger cicle. The distance between the two points correspond to a radius value.
  • a pencil or pin is placed on the hole E as a pivot wherein point is marked 0.8 mat shows it is 0.8cm from the initial point A with 0.0 mark and another pencil is placed through the hole I with mark 1.5 that shows it is 1.5cm from the initial point A
  • rotation of the instrument by means of the pencil in the hole I will draw a circle having a 2.3 cm radius from the centre. This radius value 2.3 cm is accomplished by adding 1.5 cm and 0.8 cm from third section and first section respectively.
  • Each holes on compass line (407) is large enough to accommodate the point of a pencil, so that the device can mark on the writing material.
  • the length of the compass line (407) may vary less or more, whichever demands and proves to be most convenient.
  • Fig. 10 shows another embodiment with a smaller size protractor (53) that may be extended from the fourth side (404).
  • the curved edge of the protractor may start clockwise from the left hand side starting from the bottom left edge (54) until the bottom right edge (SS) of the slit.
  • the formation of the protractor (S3) may replace the parallel ruler (440) where the third pivot hole (415) remains at the same position.
  • the third pivot hole (415) acts as the centre point of the protractor, which will translate angular measurement and coorperates with the fourth side (404).
  • the size of the smaller protractor (S3) may vary less or more, whichever proves to be most convenient.
  • FIG. 11 An elongated portion of the fourth side (404) and third side (403) is shown by a portion (51) and a portion (52) in Fig. 11 with appropriate length. Another alternative embodiment of the invention is shown in Fig.12 without the compass line (407).

Landscapes

  • Drawing Aids And Blackboards (AREA)

Abstract

La présente invention porte sur un instrument de dessin ayant un corps avec des premier (401), deuxième (402) et troisième (403) côtés pour dessiner une ligne et mesurer une distance. Le bord des côtés est droit, biseauté et marqué avec des mesures, des échelles ou des intervalles. Le corps comprend une ligne avec des points d'intervalle (407) pour servir de ligne de compas pour dessiner un cercle; un premier trou de pivot (412) disposé au niveau d'un sommet qui est un point de connexion entre le premier côté (401) et un second côté (402); et un second trou de pivot (416) qui est aligné avec le premier trou de pivot (412), le corps comprenant en outre une fente interne (431) formant un quatrième côté (404); un bord incurvé interne (422) destiné à servir de rapporteur. Un troisième trou de pivot (415) est prévu sur le quatrième côté pour servir de centre de rotation du rapporteur.
PCT/MY2017/000042 2017-01-25 2017-11-03 Instrument de dessin WO2018139915A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI2017700289 2017-01-25
MYPI2017700289 2017-01-25

Publications (1)

Publication Number Publication Date
WO2018139915A1 true WO2018139915A1 (fr) 2018-08-02

Family

ID=61022400

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2017/000042 WO2018139915A1 (fr) 2017-01-25 2017-11-03 Instrument de dessin

Country Status (1)

Country Link
WO (1) WO2018139915A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023287275A1 (fr) * 2021-07-15 2023-01-19 Ramalinggam Prebasubah Instrument de dessin et procédé associé

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE195050C (fr) *
US1995204A (en) * 1930-07-07 1935-03-19 Ford William Walter Drafting instrument
GB564645A (en) * 1943-03-02 1944-10-06 Robert Lansdown Improvements in drawing instruments
US2842857A (en) * 1955-11-08 1958-07-15 Fabio G Halphen Jr Apparatus for pattern development
DE3041724A1 (de) * 1979-11-16 1981-05-27 José Maria Bilbao Fernandez Aldape Zeichengeraet
DE8606551U1 (de) * 1986-03-10 1986-07-10 Link, Lothar, 6967 Buchen Geometrie - Dreieck
GB2310406A (en) * 1996-02-26 1997-08-27 David Edward Shillingford A circle drawing aid with protractor and set square
GB2396137A (en) * 1999-11-18 2004-06-16 Sally Werner Pivoted multi arm drawing instrument with apertures.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE195050C (fr) *
US1995204A (en) * 1930-07-07 1935-03-19 Ford William Walter Drafting instrument
GB564645A (en) * 1943-03-02 1944-10-06 Robert Lansdown Improvements in drawing instruments
US2842857A (en) * 1955-11-08 1958-07-15 Fabio G Halphen Jr Apparatus for pattern development
DE3041724A1 (de) * 1979-11-16 1981-05-27 José Maria Bilbao Fernandez Aldape Zeichengeraet
DE8606551U1 (de) * 1986-03-10 1986-07-10 Link, Lothar, 6967 Buchen Geometrie - Dreieck
GB2310406A (en) * 1996-02-26 1997-08-27 David Edward Shillingford A circle drawing aid with protractor and set square
GB2396137A (en) * 1999-11-18 2004-06-16 Sally Werner Pivoted multi arm drawing instrument with apertures.

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DENNIS KAMBILOMBILO; WHYSON SAKALA: "Reflection and Rotation '' The Case of Mufulira College of Education", SCHOOL OF MATHEMATICS AND NATURAL SCIENCES, COPPERBELT UNIVERSITY, article "An Investigation into the Challenges In-Service Student Teachers Encounter in Transformational Geometry"
JOURNAL OF EDUCATION AND PRACTICE, vol. 6, no. 2, 2015, ISSN: 2222-1735
KAKOMA LUNETA, UNDERSTANDING STUDENTS MISCONCEPTIONS: AN ANALYSIS OF FINAL GRADE 12 EXAMINATION QUESTIONS IN GEOMETRY, vol. 36, no. 1, 2015, ISSN: 1021-2346
MISCONCEPTIONS IN GEOMETRY AND SUGGESTED SOLUTIONS FOR SEVENTH GRADE STUDENTS, 2012, ISSN: 2146-9466
SAMUEL MASHINGGAIDZE: "The teaching of Geometric (Isometric) Transformation at Secondary School Level: What Approach to Use and Why?", vol. 8, 2012, FACULTY OF EDUCATION, MIDLANDS STATE UNIVERSITY

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023287275A1 (fr) * 2021-07-15 2023-01-19 Ramalinggam Prebasubah Instrument de dessin et procédé associé

Similar Documents

Publication Publication Date Title
US6467179B1 (en) Measuring and drafting tool
US6862815B1 (en) Multi-functional measuring and layout device
CN201530224U (zh) 多功能学生用尺
US5588218A (en) Teaching protractor
WO2018139915A1 (fr) Instrument de dessin
US6336274B1 (en) Right angle graphing template
Morling Geometric and engineering drawing
US6941667B2 (en) Teaching sin and cosine instrument
CN211280424U (zh) 一种数学教学用多用尺
CN211427644U (zh) 一种数学学具边角仪
CN211280429U (zh) 一种多功能数学教学用教具
KR100618031B1 (ko) 다기능 작도기
US2360911A (en) Navigational plotter
CN201151302Y (zh) 角平分线绘图仪
CN203681085U (zh) 三合形状教具
CN201353959Y (zh) 多用尺
US3239936A (en) Drawing instruments
CN101474930A (zh) 多功能绘图器
CN214240209U (zh) 教学多功能辅助绘图尺
CN220147060U (zh) 一种数学一体化多功能教学用尺
AU2021100722A4 (en) Learning aid
CN202528690U (zh) 多功能尺
CN87101527A (zh) 游标式多用绘图仪
JP3530112B2 (ja) 座標位置測定器具
CN210941088U (zh) 一种多功能特殊角度的三角尺

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17833024

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 04/11/2019)

122 Ep: pct application non-entry in european phase

Ref document number: 17833024

Country of ref document: EP

Kind code of ref document: A1

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载