FR3074449A1 - CIRCLE TRACER WITHOUT COMPASS - Google Patents

Abstract

The innovation makes it possible to draw circles of all sizes and without compass with precision, ease and safety. Unlike the compass, the device consists of a single piece, without moving part, pointed or protruding. Its use is within the reach of a child without losing the precision of the lines required for all professional work. The use of two pens or pencils placed in the graduated orifices makes it possible to draw circles of any radius by simple rotation of the device on a flat surface. Monobloc and not requiring the creation of new industrial production method, it is producible at low cost. Note: Our presentation will take into account the international metric system but can be adapted to any other unit of measurement.

Description

Description of the invention

The invention makes it possible to draw circles of desired radii with great precision, very easily and without compass.

The drawing of circles is commonly carried out using a compass. The measurement of the radius or the spacing of the arms of the compass generally requires the use of a graduated ruler - sources of errors of assessment. In addition, the point / needle of the compass is a source of danger, in particular when using the compass in schools, with children.

The innovation arises from the creation of three types of segments placed in alignment with each other on the same straight line - the types A and B segments surrounding the type C segment (Figure 1):

- the type A segment marking the even values is pierced with conical holes ® every 2mm on the values 2mm, 4mm, 6mm, 8mm (here in blue - FIG. 1)

- the type B segment marking the odd values is pierced with conical holes ®, identical to the holes present on the segment A but on the values 1mm, 3mm, 5mm, 7mm, 9mm (here in red - FIG.l)

- A third segment type C: any length rule but multiple of whole values in centimeters (example: 10cm, 15cm, 27cm). This rule presents a double graduation inverted every millimeter and pierced with conical holes ®, identical to the holes present on the segment of type A and the segment of type B, on all the whole values in centimeters (FIG.l).

The two distinct colors (here blue and red) make it possible to differentiate the values of radius to even or odd millimeters and indicate to the user which graduation to use.

Note: The conical holes (j) guide the points towards the center of the hole for increased precision. The conical holes allow the insertion of the tip of an improperly sharpened pencil or the rounded lead of a ballpoint pen and guarantee maximum stability during the drawing.

The upper diameter of the cone will depend in particular on the thickness of the support on which the innovation is incorporated to allow contact between the support to be marked and the marker.

The prototype uses a polymer support 1mm thick, pierced with conical holes whose diameter on the upper face is 1.3mm and diameter on the face in contact with the flat surface of 0.8mm

Note: These colors are also suitable for people suffering from color blindness.

Note: An organization on two lines (one for even decimals and a second for odd decimals) would have been possible (FIG.2) but multiplying the number of conical holes to be drilled, the production cost would be increase and the device would use more surface on the support tool.

Note: The invention presented in this file in the form of a rule (Figure 3 and photograph of our prototype) can however be adapted to any geometry tool or material such as a square (Figure 5), but also adapted to more complex measurement as shown in the illustrations proposed in this file (FIG. 6 and FIG. 7) and add a function to the tool.

By placing the device on a flat surface, the user draws a circle by choosing a center of rotation with a point of pencil, pen, or another type of point in the hole representing the decimal value of the desired radius and the point d 'another marker (pencil, pen, or other point) in the whole value in centimeters of the desired radius. By moving the point of the marker while keeping the two points in their respective locations, it is then easy to rotate the ruler to draw the desired radius circle with great precision (FIG.4)

More precisely, to draw a circle without compass at the desired radius at the desired location, the user directly chooses the value of the radius on the double scale (FIG. 4):

- by placing the point of a pencil, a ballpoint or felt pen, or another type of point in the hole of the value in millimeters of the radius of the desired circle (on region A or B figure 1 according to the even or odd nature of the decimal value) at the point "the center of the circle" of the flat surface to be marked,

- by placing a second point (pencil, pen, or other point) in the whole value in centimeters of the radius, of the same color as the color of the value in millimeters (on region C),

- by maintaining sufficient pressure to mark the support, the user produces a 360 ° rotation with the tip "marker" around the point "center of the circle" - axis of rotation.

Coupled with its simplicity of use, the invention thus used eliminates the errors of postponements of frequent measurements with the ruler / compass pair, the modifications of compass openings during the manipulations, makes it possible to very quickly determine the segment / radius of the circle. to plot gaining significant time for the realization of drawings / works with total security for the performer and his entourage (in the case of using only pencils or pens).

The device does not have and does not require the use of a needle point like a compass - cause "insecurity" makes accessible even to the youngest the construction of geometric figures - type circle or arc - in the school environment

Note: the length of the central region C pierced every centimeter will limit the length of the radius of the circle to be drawn, but that a central segment C pierced longer will allow the drawing of this desired circle without adding complexity to the construction of the device. .

The accompanying drawings illustrate the invention and proposes its adaptation to other types of geometric supports / tools.

- FIG.l (top view): illustration of innovation (principle). Two types of segments, A (blue) and B (red), graduated and pierced with conical holes (denoted 1) spaced respectively every 2 millimeters (A, B) framing segment C pierced every centimeter (double inverted graduation).

Only segment types A and B must respect a length of 1 cm; it is preferable that the length of the type C segment is of integer value but can be indifferent.

- FIG.2: illustration of innovation (principle). 3 regions / segments, A, B and C graduated and pierced with conical holes spaced respectively every 2 millimeters (A, B) and every centimeter (C graduated only in one direction). Only segments A and B must respect a length of 1 cm - Figure 3: illustration of the invention on a 20cm ruler and photograph of the prototype

- FIG.3: Illustration of the invention in the form of a rule such as the prototype produced.

- FIG.4: Illustration of a line: The purple pencil marks the axis of rotation in the hole representing 5mm, while the green pencil is placed in the corresponding hole 11. The movement of rotation of the green pencil around the purple pencil will therefore draw a circle of size 11.5cm (llcm + 0.5cm = 11.5cm).

Note: the rotation of the purple pencil around the green pencil will draw a 11.5cm circle but the center of the circle will be "offset".

- FIG.5: Illustration of the invention adapted on a square

- FIG. 6: illustration of the invention adapted on two multiple measurement devices

- FIG.7: illustration of the invention adapted on a multiple articulated measurement device

Claims (2)

Claim 1: The invention allowing to draw circles or arcs without a compass is characterized by the creation of 3 types of segments of different properties combined / aligned two by two: - the creation of two types of segment: type A and type B of length 1 of the chosen unit of measurement (example 1cm like using another file) and graduated from 0 to 1 every 1/10 of the unit of length chosen: - the type A segment of length 1 is drilled with a hole every 1/10 of an even unit (0; 0.2; 0.4; 0.6; 0.8). These holes are aligned on the same axis. - the type B segment of length 1 is drilled with a hole every 1/10 of an odd unit (0.1, 0.3, 0.5, 0.7, 0.9). These holes are aligned on the same axis. - the creation of a type C segment of indifferent length, is drilled with a hole all the integer values of the chosen unit included in the length of the segment, 0 included (ex: every centimeter as illustrated in our file). - the association of the 3 types of segments A, B, C allows the creation of the tool allowing to draw circles or arc of a circle: - place in the extension of one another, the alignment of the type A and type C segments creating the AC segment, the zero values of the two segments merging, makes it possible to draw the circles or arc of a circle whose radius is value to even decimal. - place in the extension of one another, the alignment of the type B and type C segments creating the segment BC, the zero values of the two segments merging, makes it possible to draw the circles or arc of a circle whose radius is value to odd decimal. Claim 2: With reference to claim 1, each type of segment is pierced with conical holes. It is preferred the use of conical holes: the diameter of the upper circle is larger than the diameter of the lower circle to favor the insertion of the points / leads used to draw the circles, to allow to guide them towards the center of the hole and thus increase the accuracy of the plot. Claim 3: With reference to claim 1, the invention making it possible to draw circles or arcs of a circle without compass is characterized by the combination of the two segments AC and BC making it possible to draw circles arcs of a circle of even values and odd values. The combination of these segments can take different forms: -2 parallel segments: AC parallel to BC -2 inverted segments superimposed as preferred in our file: A and B surrounding the segment with an inverted graduation. -2 superimposed segments: type A and type B merge and are aligned with the type C segment. AB is then a segment drilled every 1/10 of the chosen measurement unit. -2 sequential segments: AC and BC intersecting at a point.