RU2794442C1 - Easel - Google Patents

Abstract

FIELD: artist's folding easel.

SUBSTANCE: easel is proposed, which contains a T-shaped base, a stand with a longitudinal groove, rigidly connected to the transverse element of the base and hinged to its longitudinal element, a telescopic strut, hinged at one end to the stand and the other to the longitudinal element of the base, and mounted on the stand with the possibility of moving along it and the possibility of fixing the lower and upper holders. A feature of the proposed easel is that the stand is made of two wide bars, rigidly fixed relative to each other with formation of a gap between their narrow edges, forming a longitudinal groove of the stand, stepwise expanding on the back side of the stand due to the angular longitudinal recesses made in the bars. The design of each of the holders includes two plates with holes, one of which is equipped with a limiter shelf and is located on the front side of the stand, and the other is installed with the possibility of longitudinal movement in the extension of the longitudinal groove on the rear side of the stand, while the plates are tightened together by means of a bolted connection.

EFFECT: increase in load capacity and operational reliability of the folding design of the easel, which expands the possibilities of its use, enabling work with large canvases, while maintaining the simplicity and mobility of the design.

5 cl, 8 dwg

Description

The field of technology to which the invention belongs

The invention relates to a folding design of an artist's easel, and can be used both in the classroom and for field work.

State of the art

For plein air painting, as a rule, lightweight portable easel designs are used, the so-called "tripods" with sliding, sometimes telescopic legs, see, for example, patent RU 58871 U1, publ. 12/10/2006 or US patent 3304045, publ. 02/23/1965. These structures are light and comfortable, quickly assembled and disassembled, well transported, but they do not have a high load capacity and stability and cannot be used to create large overall paintings.

Known frame designs of easels, which are characterized by high load capacity and stability and are used to create large paintings, see for example patent DE 102014011202, publ. November 26, 2015, or US patent 4610414, publ. 09/09/1986, or application US 2021/0106137, publ. 04/15/2021. However, such easels are extremely complex and expensive to manufacture, difficult to set up, dismantle and transport, which limits their use for outdoor work.

An artist's easel is known (see US patent 3368786, IPC: A47B 97/08, publ. 12/23/1965), the design of which includes a T-shaped support base and an associated stand, the stand being rigidly connected to the transverse base element and pivotally connected to its longitudinal element. Between the post and the base there is a brace, pivotally connected at one end to the post and at the other end to the longitudinal element of the base. On the rack there are lower and upper holders for the picture, moving in the grooves of the metal profile of the rack.

The design of the easel according to US 3368786 is quite mobile, can be folded compactly and quickly reinstalled. The disadvantages of this design, made of thin metal profiles, include relatively low strength and low stability, especially when working with large-sized paintings.

As the closest analogue, in terms of the presence of features similar to the essential features of the proposed technical solution, the easel design disclosed in patent FR 630170, IPC: A47B 97/08, publ. 11/24/1927.

The similarity of the known design with the proposed one lies in the fact that it contains a T-shaped base formed by transverse and longitudinal support elements, a rack with a longitudinal groove connected rigidly to the transverse element of the base and hinged to its longitudinal element, a telescopic strut hinged at one end with a stand and another - with a longitudinal element of the base, and lower and upper holders mounted on the stand with the possibility of longitudinal movement and fixation.

The length of the telescopic strut links allows, without disassembling the structure, to transform it from a working position into a compact transport one and vice versa.

As the disadvantages of the closest analogue, it should be noted: the relatively low reliability of the junction of the stand and the support base, which, under increased loads, for example, when installing a heavy stretcher with a blank for a large-sized painting, can lead to breakage of the easel in the junction of the stand with the base. Another disadvantage is the low reliability of fixing the holders, which is carried out by a pair of clamping screws interacting with the front surface of the rack, which limits the possibility of using the well-known easel design for heavy overall paintings.

In addition, in the design according to patent FR 630170, initially, during manufacture, an inclined working position of the stand relative to the base is set, which leads to an inclined position of the working surface of the canvas and distorts the color rendition when creating paintings.

The present invention is directed to the creation of a folding design of the easel, which provides the possibility of reliable work with large canvases and at the same time is characterized by high mobility and simplicity.

The achieved technical result is to increase the load capacity and operational reliability of the folding design of the easel, which expands the possibilities of its use, allowing you to work with large canvases, while maintaining the simplicity and mobility of the design.

Additionally, high manufacturability and maintainability of the structure are ensured, as well as an expansion of the arsenal of tools for the corresponding purpose.

Essence disclosure

The mentioned technical results are achieved due to the fact that in the design of the easel, containing a T-shaped base, a stand with a longitudinal groove connected rigidly to the transverse element of the base and hinged to its longitudinal element, a telescopic strut, hinged at one end to the stand and the other to longitudinal element of the base, and mounted on the rack with the ability to move along it and the possibility of fixing the lower and upper holders, according to the claimed utility model, the rack is made of two wide bars rigidly fixed relative to each other with the formation of a gap between their narrow edges, forming a longitudinal groove of the rack , stepwise expanding on the rear side of the rack due to the angular longitudinal recesses made in the bars, each holder is formed from two plates with holes, one of which is made with a limiter shelf and is located on the front side of the rack, and the other is installed with the possibility of longitudinal movement in the extension a longitudinal groove on the rear side of the rack, while the plates are pulled together by means of a fastener passed through the gap and holes in the plates, and fixed with the possibility of adjusting the tightening force.

The terms "longitudinal" and "transverse" for the base elements are conventionally accepted. So the "longitudinal" element forms the leg of the letter T (see the attached drawings). In reality, in the installed easel, the “longitudinal” element is located behind the stand, adjacent to the back of the stand.

Making a rack of two wide bars, i.e. in which the width is more than twice their thickness, allows you to significantly increase the contact area between the rack and the base in the area of their connection, resulting in increased reliability of the connection, increases its load capacity.

At the same time, the design of the holders from two parts, located on the front and rear sides of the rack and tightened together through the rack by a bolted connection, ensures reliable fixation of each of the holders on the rack and, as a result, their stable position, even in the case of heavy loads during installation. oversized canvases.

At the same time, an increase in the width of the rack allows you to expand the area of \u200b\u200bthe support on which the working canvas installed on the easel rests (leans), which contributes to its more stable position in the process of working on the picture, which is especially important when working with large canvases.

Thus, in comparison with the closest analogue, the proposed design of the easel is characterized by high load capacity, stability and operational reliability, with simplicity and mobility, which provides ample opportunities for using the easel: for writing pictures of any size, both in a classroom or studio, and on check out.

At the same time, the proposed design of the easel is highly manufacturable due to the use of simple parts (bars and plates), the formation of a longitudinal groove of the rack in the form of a gap between the bars, and also due to the application of the principle of unification of nodes in the manufacture of holders.

The preferred execution of all structural elements of wood ensures environmental friendliness and aesthetics of the structure. In this case, the high frictional force between the wooden elements of the holder and the post contributes to the reliable fixation of the holder even with low tightening forces. The optimal width of the rack bars is from 90 to 120 mm, with a thickness of 20-40 mm.

Unlike the closest analogue, where the rack is installed in a recess on the front side of the transverse base element, in the proposed design, the transverse base element adjoins the wide front side of the bars and forms an overlap connection with each of them. In this case, another important characteristic of the easel is provided, namely: ensuring the vertical position of the working canvas installed on the easel, which is especially important in the case of creating pictorial art canvases, because. otherwise, light is refracted and the perception of colors is distorted.

To tighten the parts of the holder, a pair of "bolt-nut" can be used, and the bolt is passed through the holes of the plates and the gap, and to fix it, a wing nut is used, which has special "lugs" that provide convenient manual adjustment of the tension force. If necessary, this pair can be replaced by a stud with two nuts or other fasteners obvious to a person skilled in the art.

The links of the telescopic strut have a length that allows the transformation of the articulated structural elements from the working position to the transport position, and vice versa.

Brief description of the drawings The essence of the proposed technical solution and the results achieved are illustrated by examples of specific implementation and the attached drawings, which show:

in fig. 1 - easel, front view in working position;

in fig. 2 - also, side view (view A from Fig. 1);

in fig. 3 is a section A-A from FIG. 1;

in fig. 4 - lower holder, isometry with parts spaced apart in space;

in fig. 5 - upper holder, isometry with parts spaced apart in space;

in fig. 6 is a section B-B of FIG. 1;

in fig. 7 section C-C of FIG. 1;

in fig. 8 - folded easel (transport position).

Implementation of the invention The design of the easel includes (see Fig. 1) a T-shaped base formed by the transverse 1 and longitudinal 2 support elements, the stand 3 with a longitudinal groove connected rigidly with the transverse element 1 of the base and pivotally with its longitudinal element 2, a telescopic strut 4, hinged at one end to the column 3, and at the other end to the longitudinal element 2 of the base, as well as the lower 5 and upper 6 holders mounted on the column 3 with the possibility of moving along it and fixing.

The holders 5 and 6 are used to place and hold during the work the working canvas, which is a canvas on a stretcher, a sheet of cardboard or paper, etc., on which a picture is created, as well as completed paintings and, if necessary, other objects of a similar shape.

The preferred easel material is wood.

Rack 3 is made of two wide bars 7 and 8, preferably having a width of 90-120 mm and a thickness of 20-40 mm.

Bars 7 and 8 are placed in the same conditional plane, parallel to each other and with the formation of a gap 9 between their narrow edges, forming a longitudinal groove of the rack, and are rigidly connected in this position, for example, by means of transverse strips 10, 11, 12, placed at the ends and in the middle part of the rack, from its back side (see Fig. 2). The transverse bars can be used to place on them the hinged joints of the rack 3 with the brace 4 and the longitudinal element 2 of the base.

The gap 9 between the bars 7 and 8 forms a longitudinal groove of the rack 3, which gradually expands on its back side due to the angular longitudinal recesses 13, previously made in the bars 7 and 8, along their entire length (see Fig. 3).

In the manufacture of the base, more massive bars are used to give greater stability to the structure.

The transverse element 1 of the base is adjacent to the front wide side of the bars 7 and 8 and forms an overlap connection with each of them.

The implementation of the rack 3 of two wide bars provides, in comparison with the closest analogue, a significant increase in the contact area S of the rack and the base in the connection area, which contributes to increased reliability of the support node and its load capacity.

Additionally, the rigidity of the structure is facilitated by the fact that the lower edge of the bars 7 and 8 is clamped between the base element 1, located on the front side, and the bottom bar 11, located on the back side of the rack, to which the longitudinal base element 2 is attached.

The lower holder 5 (see Fig. 4) and the upper holder 6 (see Fig. 5) have a similar design, consisting of two parts, each of which, in fact, is a plate with a through central hole.

One of the parts - plate 14 - is equipped with a limiter shelf 16, which provides support for the working canvas (picture) in the case of the lower holder, and a limiting stop in the case of the upper holder.

The shelf-limiter 16 can be provided with a collar 17 or be L-shaped, which contributes to additional reliability of holding the working canvas 18 installed on it, shown in FIG. 1 dotted line.

When installing the holder on the rack, one part - plate 14 - is placed on the front side of the rack 3, and the other part - plate 15 - is installed opposite it in the expansion of the longitudinal groove on the rear side of the rack. Both plates are pulled together through the bars 7 and 8 by means of a pair of "bolt-nut" (see Fig. 6 - 7).

Bolt 19 is passed through gap 9 and holes 20 of the plates. As a nut, preferably, a wing nut 21 is used, which has special "lugs" that are convenient for gripping and manually adjusting the tension force.

Studs or other fasteners, obvious to those skilled in the art, may also be used to connect parts of the holders.

As tests of the prototype showed, the design of the holders is simple and at the same time ensures their stable fixed position on the rack under any load, including when working with large-sized canvases.

The unification of holder assemblies simplifies manufacturing and improves the maintainability of the structure.

Due to the execution of rack 3 of two bars, the area of support of the picture mounted on the easel is significantly expanded, which contributes to the stability of its position during work, including this is valid for large canvases.

The execution of the longitudinal groove of the stand in the form of a gap between the bars is quite simple and technologically advanced, and at the same time provides the possibility of unlimited movement of the holders, practically from the base to the very top of the stand, which maximizes the range of sizes of paintings that can be placed on an easel. Using such an easel, the artist is not limited in choosing a creative task, he can work with canvases of any size, both standing and sitting.

In FIG. 8 shows the transport (folded) position of the easel. The links of the telescopic strut 4 have a length that makes it possible to transform the structure in an articulated form, i.e. transfer of the structure from the working position to the transport position and back without disassembling the joints.

The proposed design of the easel is simple and technologically advanced in manufacturing, convenient and reliable in operation. The high load capacity of the design allows you to work with large-sized canvases, while it is quite mobile.

The design provides a stable vertical working position of the stand, and hence the working surface of the canvas, which is necessary when creating paintings. At the same time, the design allows you to adjust the tilt of the stand 3 relative to the base, changing the length of the brace 4, and ensures a stable position of the easel when the stand deviates from the vertical in the range from 60 to 100°.

Claims (5)

1. An easel containing a T-shaped base, a stand with a longitudinal groove connected rigidly to the transverse element of the base and hinged to its longitudinal element, a telescopic strut, hinged at one end to the stand and the other to the longitudinal element of the base, and mounted on the stand with the possibility of moving along it and the possibility of fixing the lower and upper holders, characterized in that the rack is made of two wide bars rigidly fixed relative to each other with the formation of a gap between their narrow edges, forming a longitudinal groove of the rack, stepwise expanding on the rear side of the rack due to made in the bars of angular longitudinal recesses, each holder is formed of two plates with holes, one of which is equipped with a limiter shelf and is located on the front side of the rack, and the other is installed with the possibility of longitudinal movement in the expansion of the longitudinal groove, while the plates are pulled together by means of a fastener passed through the gap and holes in the plates and fixed with the possibility of adjusting the tightening force. 2. An easel according to claim 1, characterized in that the stand is made of bars with a width of 90 to 120 mm. 3. An easel according to claim 1, characterized in that all structural elements are made of wood. 4. An easel according to claim 1, characterized in that the transverse element of the base is adjacent to the front wide side of the bars and forms an overlap connection with each of them. 5. The easel according to claim 1, characterized in that the links of the telescopic strut have a length that allows the transformation of the articulated structural elements from the working position to the transport position and vice versa.

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