DRAWING AID TOOL

Abstract

Drawing aid tool. The invention relates to a drawing support instrument comprising a first element (1) with an outer frame (2) and an inner portion with square holes (3) arranged in a matrix; a second element (5) with a coupling portion (6), a longitudinal portion (7), and a support portion (8); and a third element (9) comprising a fixing portion (10) and a viewing window (11). The coupling portion (6) cooperates with the first coupling means (4) to provide a sliding joint along a sliding direction. The coupling portion (6) or the first coupling means (4) are provided with a locking device (12) for fixing the relative position of the second element (5) with respect to the first element (1).The fixing portion (10) of the third element (9) is configured to cooperate with the support portion (8) of the second element (5) to provide a fixed connection between the third element (9) and the second element (5).

Description

DRAWING AID TOOL FIELD OF INVENTION The present invention belongs to the technical field of drawing aids. More specifically, the object of the invention is an improvement on the traditional Albertian veil. BACKGROUND OF THE INVENTION There are many tools that can help an artist capture the reality around them on paper. One of these is Alberti's veil, which allows the artist to draw objects and scenes in perspective more accurately. This tool comprises several elements. A strip with the viewpoint helps establish the horizon line and vanishing points, while the frame and graph paper provide a reference structure to ensure that proportions and distances are represented correctly. However, this device requires a sturdy table for precise mounting in order to be used. All versions, even the most modern ones, require a table for setup. This makes it difficult to use outdoors, for drawing landscapes in locations lacking resources or where setting up a table is challenging. In light of the above, there is a need to provide a portable alternative to Alberti's veil. BRIEF DESCRIPTION OF THE INVENTION The present invention solves the previous limitations of the prior art by means of a drawing support instrument. Thus, the present invention relates in a first aspect to a drawing support instrument comprising a first one-piece element, comprising an outer frame portion and an inner portion comprising a plurality of square holes arranged in a matrix, wherein the outer portion comprises first coupling means; a second element comprising a coupling portion, a longitudinal portion, and a support portion; and a third element comprising a fixing portion and a peephole, where the coupling portion of the second element is suitable to cooperate with the first coupling means of the first element to provide a sliding joint along a sliding direction, where the coupling portion and the first coupling means offer resistance to frictional displacement; The fixing portion of the third element is configured to cooperate with the support portion of the second element to provide a fixed connection between the third element and the second element. This instrument not only makes a mere adaptation of Alberti's traditional veil to a more portable configuration, but also provides numerous additional advantages. First, the first element is made from a single piece. Therefore, it is suitable for simple manufacturing by molding or 3D printing. Furthermore, this allows for rigidity, enabling it to maintain a stable position without the need for excessively bulky support. Secondly, the position between the first and third elements, which includes the crosshairs, can be adjusted. This allows you to adjust the viewpoint and field of view depending on the scene you wish to depict. Thirdly, the longitudinal portion allows the device to be held easily, without the need for an auxiliary table where all the elements can be placed in a calibrated manner. Therefore, the device of the present invention provides numerous advantages that allow it to be sufficiently differentiated from any combination available in the prior art. In particular embodiments, the instrument further comprises a light source configured to project light onto the first element. In this way, light can be projected onto the scene to be drawn, with the added advantage that the grid of the first element itself is also projected onto the scene, making it easier to draw. In particular embodiments, the first coupling means are a groove and the coupling portion is a longitudinal portion having a width and height suitable for fitting snugly into the groove, providing resistance to frictional displacement at this joint. A groove allows the second element to be inserted into the first element in a controlled manner. When we say "tight fit," we mean that there is a small tolerance for the second element to fit into the groove without creating any play. Current manufacturing methods are designed to provide this type of fit. In fact, it is the tight fit that causes resistance to frictional movement. In particular embodiments, the coupling portion comprises a plurality of measuring marks that allow controlled adjustment of the distance between the sight glass and the first element. This allows for easy control over the proportions and scale of the scene. Furthermore, if used in an academic setting, the same instructions can be given to all students, ensuring uniformity in execution within seconds. In particular embodiments, the matrix comprises at least 5 rows of holes and at least 5 columns of holes. In this way, it is easy to have a sufficient number of holes to allow for sufficient detail of the scene. In particular embodiments, the coupling portion comprises a hole with a universal thread configured to connect a tripod. Although the instrument can be held by hand, it is also possible to attach it to a tripod to allow both hands to be free for drawing. In particular embodiments, the longitudinal portion of the second element is telescopic. In this way, the range of the instrument is increased, making it suitable for both short and long distances. In particular realizations, the first element, the second element and the third element are made of the same material. In this way, preparing the manufacturing of the instrument is very simple, since the same molding or 3D printing process would be sufficient to manufacture the three elements in series. In particular embodiments, the fixing portion of the third element and the support portion of the second element offer resistance to displacement by friction. In this way, the fit between the two pieces can be controlled, placing the third element where it best suits. In particular embodiments, the fixing portion of the third element comprises a stop intended to abut the support portion of the second element. In particular embodiments, the support portion of the second element comprises a stop intended to prevent the fixing portion of the third element from advancing. The connection between the second and third elements may be controlled by a stop, which could be located either in the second element (so that the slot where the third element is inserted is blind, i.e., not through) or in the third element (due, for example, to a change in its cross-section that acts as a stop when inserted into the slot). Whatever the reason, this option is advantageous, as it allows the third element to be fixed relative to the second element at a required distance, which can be beneficial, as will be discussed below. In particular embodiments, the distance between the stop and the center of the peephole is equal to the distance between the first coupling means and the center of the square hole array. This peculiarity is advantageous from a design standpoint. As previously mentioned, in certain embodiments, the third element can fix its position relative to the second element. When this position is defined by this feature (the distance between the stop and the center of the peephole is equal to the distance between the first coupling means and the center of the array of square holes), the synchronization required by the Albertian veil design is achieved. All terms and embodiments described anywhere in this document are equally applicable to all aspects of the invention. It should be noted that, as used in the description and claims, the singular forms "a," "an," and "the" include their plurals unless the context clearly indicates otherwise. Similarly, the term "comprises" or "comprising," as used herein, also describes "consists of" or "consisting of" in accordance with generally accepted patent practice. DESCRIPTION OF THE FIGURES The following is a brief description of each of the figures used to complement the description of the invention that follows, for illustrative and non-limiting purposes: Figure 1 shows an exploded view according to a particular embodiment of a drawing support instrument according to the present invention. Figure 2 represents the instrument of Figure 1 once assembled. Figure 3 represents an alternative drawing support instrument according to the present invention. Numerical references for the figures In order to aid a better understanding of the technical characteristics of the invention, the aforementioned figures are accompanied by a series of numerical references where, for illustrative and non-limiting purposes, the following is represented: DETAILED DESCRIPTION OF THE INVENTION The detailed description of the present invention that follows refers to the accompanying drawings, which illustrate specific embodiments in which the present invention can be implemented. These embodiments are described in sufficient detail to enable those skilled in the art to implement the present invention. It should be understood that various embodiments of the present invention are different from one another, but are not necessarily mutually exclusive. Accordingly, the detailed description that follows is not intended to be taken in a restrictive sense, and the scope of the present invention, if properly described, is limited only by the appended claims, in addition to all scopes equivalent to those claimed by the appended claims. In the drawings, the reference numbers refer to the same or similar functions in various respects. The preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. Figure 1 shows an exploded view according to a particular embodiment of a drawing support instrument according to the present invention. In this figure, three main elements can be distinguished: a first element 1, a second element 5, and a third element 9. The first element 1 is manufactured in one piece and comprises an outer portion 2 in the form of a frame and an inner portion that is enclosed by the frame 2. This inner portion has a grid structure that forms a matrix of square holes 3 arranged in a matrix. The second element 5 has a coupling portion 6, a longitudinal portion 7, and a support portion 8. The coupling portion 6 is configured to fit snugly into a groove 4 located in the frame 2 of the first element. In this way, the second element 5 can slide relative to the first element 1 along a sliding direction parallel to the longitudinal direction of the coupling portion 6 of the second element 5. This sliding is frictional, so the distance the second element 5 enters the groove 4 can be controlled. Finally, the third element 9 includes a fixing portion 10 and a viewing window 11. The fixing portion 10 allows the third element 9 to be fixed to the second element 5. This is achieved because the support portion 8 comprises a blind hole into which the fixing portion 10 of the third element 9 is inserted, acting as a stop, such that the distance between this stop and the center of the viewing window 11 is equal to the distance between the slot 4 and the center of the array of square holes. The center of the array is understood to be the central point equidistant from both the lateral ends and the upper and lower ends of said array. Figure 2 represents the instrument of Figure 1 once assembled. Thanks to the sliding joint between the first element 1 and the second element 5, and the fixed joint between the second element 5 and the third element 9, the distance between the peephole 11 and the frame 2 can be easily selected. Furthermore, the friction between the first element 1 and the second element 5 allows the relative position of the second element 5 with respect to the first element 1 to be fixed, and the measuring marks 14 allow the distance between the peephole 11 and the first element 1 to be selected. In this way, it is possible to test different positions depending on the type of scenario to be represented. The configuration of the hole array comprises in this case four rows and six columns of holes 3. However, this number may be greater without essentially altering the concept of the invention. Furthermore, the first element (1), the second element (5), and the third element (9) are all made of the same material. This makes it very easy to produce the instrument using injection molding or 3D printing processes. Figure 3 represents an alternative drawing support instrument according to the present invention. In this case, it can be seen that there is a light source 13 located in the third element 9. This light source 13 projects light towards frame 2, so that, for example, it can project the shadow of the grid structure onto a wall with a drawing on it, in order to make the drawing more convenient. It is also interesting at an educational level, since, when a grid is projected onto a three-dimensional object, the grid is modified when superimposed on the object, creating an image that looks similar to a topographic map with level elevations. It can also be seen in this figure that the coupling portion 6 comprises a hole 15 with a universal thread configured to connect a tripod.

Claims

1. A drawing support instrument comprising a first one-piece element (1) comprising an outer frame portion (2) and an inner portion comprising a plurality of square holes (3) arranged in a matrix, wherein the outer portion (2) comprises first coupling means (4); a second element (5) comprising a coupling portion (6), a longitudinal portion (7), and a support portion (8); and a third element (9) comprising a fixing portion (10) and a viewing window (11), wherein the coupling portion (6) of the second element (5) is adapted to cooperate with the first coupling means (4) of the first element (1) to provide a sliding joint along a sliding direction.wherein the coupling portion (6) and the first coupling means offer resistance to frictional displacement; the fixing portion (10) of the third element (9) is configured to cooperate with the support portion (8) of the second element (5) to provide a fixed connection between the third element (9) and the second element (5).

2. An instrument according to claim 1 further comprising a light source (13) configured to project light onto the first element.

3. An instrument according to any of claims 1 or 2, wherein the first coupling means (4) are a groove and the coupling portion (6) is a longitudinal portion having a width and height suitable for fitting snugly into the groove, providing resistance to frictional displacement at this connection.

4. An instrument according to claim 3,wherein the coupling portion comprises a plurality of measuring marks (14) that allow controlled adjustment of the distance between the sight (11) and the first element (1).

5. Instrument according to any of claims 1 to 4, wherein the matrix comprises at least 4 rows of holes and / or at least 6 columns of holes (3).

6. Instrument according to any of claims 1 to 5, wherein the coupling portion (6) comprises a hole (15) with a universal thread configured for connecting a tripod.

7. Instrument according to any of claims 1 to 6, wherein the longitudinal portion (7) of the second element (5) is telescopic.

8. Instrument according to any of claims 1 to 7, wherein the first element (1), the second element (5), and the third element (9) are made of the same material.

9. Instrument according to any of claims 1 to 8,wherein the fixing portion (10) of the third element (9) and the support portion (8) of the second element (5) offer resistance to displacement by friction.

10. Instrument according to any of claims 1 to 9, wherein the fixing portion (10) of the third element (9) comprises a stop intended to abut the support portion (8) of the second element (5).

11. Instrument according to any of claims 1 to 10, wherein the support portion (8) of the second element (5) comprises a stop intended to prevent the advancement of the fixing portion (10) of the third element (9).

12. Instrument according to any of claims 10 or 11, wherein the distance between the stop and the center of the sight glass is equal to the distance between the first coupling means (4) and the center of the matrix of square holes.

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