FR3058088A1 - DEVICE FOR TUNING CANVAS ON CHASSIS AND KIT FOR ASSEMBLING A CHASSIS FOR CANVAS - Google Patents

Abstract

The invention relates to a device (1) for tensioning canvas on a frame, used to assemble two uprights (6) whose ends (61) each have a groove (62). The device (1) comprises: a spacer (2) having a central portion (21) from which two side portions (22, 24) extend, each having a bearing face engaging the bottom (62a) of a groove (62); a tensioner (3) having a central portion (31) from which solidarity means (32) extend from the tensioner (3) to the uprights (6); a member (4) for connecting the spacer (2) to the tensioner (3), and means (41, 42, 33) for moving the spacer (2) towards the tensioner (3), which approximation will move each amount (6) in translation along its longitudinal axis so as to separate them from each other while keeping them perpendicular to each other.

Description

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY

COURBEVOIE © Publication number:

(to be used only for reproduction orders) (© National registration number

058 088

70647 © IntCI ⁸

B 44 D 3/18 (2017.01)

PATENT INVENTION APPLICATION

A1

©) Date of filing: 31.10.16. (30) Priority: © Applicant (s): ROY FRANÇOIS —CA. @ Inventor (s): ROY FRANÇOIS. @) Date of public availability of the request: 04.05.18 Bulletin 18/18. (© List of documents cited in the preliminary search report: See the end of this brochure (© References to other related national documents: @ Holder (s): ROY FRANÇOIS. ©) Extension request (s): © Agent (s): CABINET CHAILLOT.

VX) DEVICE FOR TENSIONING CANVAS ON CHASSIS AND KIT FOR ASSEMBLING A CANVAS CHASSIS.

FR 3 058 088 - A1

The invention relates to a device (1) for tensioning canvas on a frame, used to assemble two uprights (6) whose ends (61) each have a groove (62). The device (1) comprises: a spacer (2) having a central part (21) from which extend two lateral parts (22, 24) each having a bearing face coming into contact with the bottom (62a) of a groove (62); a tensioner (3) having a central part (31) from which extend means for securing (32) the tensioner (3) to the uprights (6); a member (4) for connecting the spacer (2) to the tensioner (3), and means (41, 42, 33) for bringing the spreader (2) closer to the tensioner (3), which approximation will move each amount (6) in translation along its longitudinal axis so as to separate them from one another while keeping them perpendicular to each other.

FABRIC TENSIONING DEVICE ON CHASSIS AND KIT

FOR ASSEMBLING A CANVAS CHASSIS

The present invention relates to the field of wooden frames for painting canvas and printed canvas, and relates in particular to a device for tensioning canvas on chassis making it possible to assemble two perpendicular adjacent chassis uprights and to tension a canvas on a frame assembled using four such devices, one at each corner of the frame.

The easiest way to stretch a canvas on a frame, which is the simplest in terms of tools, is to apply a piece of canvas larger than the frame to a frame, then fold the canvas up along the four uprights making up the frame. , by pulling on the canvas, for example using a pliers, to fix the canvas along the uprights, for example by stapling, leaving the canvas free at the corners, and finally, at each angle of the frame, fold the free part of the canvas back on itself by forming overlapping folds and then staple the folds on the frame.

The above solution has the disadvantages of requiring the use of tensioning pliers and of being relatively long to implement if one wishes to correctly tension the canvas, since the user must tighten it all along the uprights before fixing it. This is all the more true when the chassis are of larger formats.

Either that, more this solution assumes the user has a chassis already assembled, or that the user proceeds himself to the assembly of the four uprights of the chassis, which represents an additional work which again requires tools and is not easy for larger formats.

The present invention aims to propose a device for tensioning canvas on a wooden frame making it possible to quickly and simply assemble two adjacent uprights of a frame and to tension in an equally easy and rapid manner, but also precise, a canvas on a frame assembled using devices according to the present invention.

The present invention relates to a device for tensioning canvas on a preferably wooden chassis, intended to assemble perpendicularly to each other two chassis uprights whose ends are for this purpose bevelled at 45 ° for a simple bevel type assembly of the two uprights and each have a groove opening into said end and having a bottom perpendicular to the longitudinal axis of the respective upright, the device being characterized in that it comprises:

- A spacer, which comprises a central part having two ends from each of which extends a lateral part intended to be received in the groove of a respective upright from the two uprights, each lateral part having a bearing face intended , in the position of use, in which the two uprights are assembled, to be in contact with the bottom of the groove, - a tensioner, which comprises a central part from which extend suitable fastening means, in position of use, to make the tensioner integral with the two uprights, while allowing a displacement in translation of each outside of the inner frame of the uprights relative to the tensioner, along the longitudinal axis of said upright, the tensioner being positioned on the inside assembled uprights, - a member for connecting the spacer to the tensioner, and - means for bringing the spacer towards the te nsionneur, which means of approximation being able, in the position of use, to move towards the tensioner the spacer which is located on the outside of the assembled uprights, which displacement of the spacer will cause each bearing face to push on the bottom of the respective groove and thus to move each upright in translation along the longitudinal axis of the upright so as to separate the two uprights from one another while keeping them perpendicular to each other.

In order to avoid any ambiguity, it is emphasized here that the expression "interior of the assembled uprights" designates the region, called interior, which is delimited by four uprights assembled to form the frame, while the expression "exterior of the assembled uprights" designates the region, called the exterior, which is located on Thus, the expression "assembled side" means that the tensioner is closer to the interior region than to the exterior region, while the expression "exterior side of the assembled uprights" means that the retractor is closer to the outer region than the inner region.

According to a particular embodiment, the central part of the retractor has in its center a smooth through hole, the central part of the tensioner has in its center a threaded through hole which is aligned, in the use position, with said through hole smooth, the connecting member being a screw having a screw head and a threaded rod dimensioned to extend in a freely sliding and rotary manner in the smooth through hole of the retractor then to be screwed into the tapped hole of the tensioner, so that a rotation of the screw in a first direction causes the retractor to approach the tensioner, said approximation means being thus formed by the screw and the tapped hole.

The device according to the present invention may further comprise a nut capable of being screwed onto the threaded rod of the screw, in the vicinity of the spacer so as to retain it in position when the tensioner is secured to the chassis uprights, the the nut being further dimensioned so as to be able to extend inside the grooves of the uprights, and is preferably a round nut.

The spacer may be in the form of a bar having a first straight segment constituting the central part of the spacer, two intermediate segments each extending from a respective end of said first segment, forming an angle of 45 ° with respect thereto, and two end segments each extending from one end of a respective intermediate segment, at an angle of 90 ° with respect thereto. The bar can be of rectangular or round section, for example.

The tensioner may have a flared U shape, the bottom of which is formed by the central part of the tensioner and each of the two branches of which is formed by a lateral part extending from a respective end of the central part, said means of fastening being formed by said two lateral parts, the tensioner preferably being formed by a flat piece.

The lateral parts of the tensioner can have a width greater than that of the spacer, in particular that of the lateral parts of the spacer, for attachment to the uprights by force-fitting the lateral parts of the tensioner in the grooves of the uprights.

The width of the lateral portions of the tensioner is preferably smaller in a free end region of the lateral portion than in the rest of the lateral portion, where it is generally constant, so as to facilitate the introduction of the lateral portion into the groove of an upright.

A support rib may be provided on each of the two lateral walls of the spacer and / or of the tensioner, in the center of said central part, the support ribs being, in the use position, parallel to the member. link. The support ribs allow the user to center the spacer correctly during assembly: the lateral parts of the spacer are introduced into the grooves until the edges of the grooves come into contact with the ribs d 'support. In this way, correctly centering the spacer avoids uneven displacement of the two uprights which would cause the rectangular shape of the chassis to be lost.

The present invention also relates to a kit for assembling a canvas frame, preferably made of wood, and tensioning a canvas on the frame, characterized in that it comprises at least four uprights chassis whose ends are bevelled at 45 ° for a simple bevel-type assembly between each adjacent upright and each have a groove opening into said end and having a bottom perpendicular to the longitudinal axis of the respective upright, and at least four canvas tensioning on chassis as defined above. The kit may include any number, multiple of four, uprights and fabric tensioning devices.

The kit may further comprise a key in the form of an elongated flat part comprising a gripping part from which extends an actuating part, the key being preferably provided with a first hole circular through, for example in the actuating part, so as to allow the user to tear off staples out of a frame upright. The user can use this key to introduce, into the gap created between two adjacent uprights after tensioning the fabric, the corner part of the fabric that had been left free, as will be explained in more detail below. after.

Advantageously, two teeth extend parallel to the longitudinal direction of the key and from the free transverse edge of the actuating part, so as to allow the user to release staples from a frame upright, without noticeably distort them.

Finally, a second through hole, of larger diameter, can be provided, for example in the gripping part, to allow the key to be hooked to a support, such as for example a conventional key ring.

To better illustrate the object of the present invention, a particular embodiment will be described below, by way of indication and without limitation, with reference to the attached drawing.

On this drawing :

Figures 1 and 2 are views respectively in exploded perspective and in perspective of the device according to a particular embodiment of the present invention;

Figures 3a, 3b, 3c, 3d are side, front, rear and top views of the device of Figures 1 and 2 respectively;

Figure 4 is a perspective view of the device of Figures 1 and 2, according to an alternative embodiment;

- Figures 5 and 6 are respectively perspective and plan views of the angle of a chassis equipped with a device of Figures 1 and tension of a fabric;

2, before setting in Figure 7 is a view similar to Figure 6, after tensioning a canvas;

Figure 8 is a perspective view of a chassis assembled by four devices according to the present invention, in the initial position;

Figure 9 is a rear perspective view of a paper cover on the frame of Figure 8;

Figure 10 is a side view of a corner of the frame of Figure 9, before tensioning;

Figure 11 is a perspective view of the angle of Figure 10, showing the last step of introducing the remaining part of the fabric between the uprights; and

- Figure 12 is a present invention.

plan view of the key according to the

If we refer first to Figures 1, 2 and 3a to 3d, we can see that there is shown a device 1 for tensioning canvas on a frame, hereinafter simply referred to as device 1 for the sake of brevity. The chassis will preferably be made of wood, but could be made of other material (s), for example entirely of plastic material (molded urethane) or wood with plastic end piece at each end of the uprights.

The device 1 comprises a spacer 2, a tensioner 3, a screw 4 and a nut 5.

The spacer 2 is in the form of a rigid cross section. The bar 20 thus has a so-called interior side 20a, an exterior side 20b and two lateral sides 20c.

small parallelepiped bar 20.

In particular, the bar 20 consists of five rectilinear segments connected by elbows: a first segment forming the so-called central part 21, two intermediate segments 22 each connected to a respective end of the central part 21 by a first bend 23, and two segments end 24 each connected to a respective end of an intermediate segment 22 by a second bend 25. In the embodiment shown, each intermediate segment 22 forms an angle of 45 ° with the central part 21 while each segment of end 24 forms an angle of 90 ° with the intermediate segment 22 to which it is connected. The fact that the different rectilinear segments 21, 22, 24 are connected by elbows 23, 25 makes it possible to avoid the creation of sharp edges. As can be seen, the elbows can be simple elbows, namely formed only by a curved part, like the elbows 23, or can be compound elbows, for example comprising two curved parts connected by a straight part of short length, like for example the elbows 25.

In the embodiment shown in FIGS. 1, 2 and 3a to 3d, each end segment 24 constitutes the so-called lateral part, also designated here by the reference numeral 24.

Each end segment 24 has a flat face 24a which forms a part of the outer side 20b of the spacer 20. This face 24a forms the so-called bearing face according to the present invention.

The above shape of the bar 20 can be obtained by any suitable means. In the case of a bar 20 made of metal, such as for example steel, it can be obtained by folding an initially straight bar. It is emphasized here that the bar 20 can be made of any other rigid material, such as for example plastic or composite material, in which case the bar 20 can be round and the above shape could be obtained, for example, by injection, 3D printing (additive manufacturing process), etc ...

A smooth cylindrical through hole 26 is produced, for example by drilling, in the center of the central part 21, perpendicular to the longitudinal axis of the latter, from the inside side 20a to the outside side

20b.

ίο

Two rectilinear ribs 27, called support, are provided, each on a lateral side 20c of the bar 20, over the entire height of the latter. In particular, each rib 27 is parallel to the axis of the smooth hole 26 and to the center of the central part 21, namely that the longitudinal axis of the ribs 27 and the axis of the smooth hole 26 belong to the same plane perpendicular to the longitudinal axis of the central part 21.

The tensioner 3 is in the form of a flat piece 30 of rectangular cross section, made of rigid material, piece 30 which has been given a flared U shape. The part 30 thus has a central part, referenced 31, and two wings 32 forming two lateral parts also referenced 32. Here again, an interior side 30a, an exterior side 30b and two sides are defined.

side 30c for part 30. Analogously to bar 20 forming the spacer 2, the part 30 forming the tensioner 3 may be made, for example, of metal or material

composite.

Each wing 32 forms an angle with the central part 31 of the tensioner 3 which is equal to that between an intermediate segment 22 and the central part 21 of the spacer 2, namely an angle of 45 °.

Each wing 32 has a free end region 32a which has a width less than that of the rest of the wing 32, said width being the distance between the two lateral sides 30c, which distance is measured in a direction perpendicular to the axis longitudinal of the wing 32. In particular, the width of each wing 32 is at a first constant value over a certain length from its end connected to the central part 31, then gradually decreases, along lateral surfaces π

inclined 32b, up to the free end region 32a which has a generally constant width at a second value less than the first value.

Similarly to the spacer 2, a threaded through hole 33 is made in the center of the central part 31, perpendicular to the longitudinal axis of the latter, from the inner side 30a to the outer side

30b, and two ribs 34 parallel to the axis of hole 33 and each on all the side height lateral 30c respective. The screw 4 East a classic screw and East so

formed by a screw head 41 from which extends a threaded rod 42.

The nut 5 is dimensioned so that it can be screwed onto the threaded rod 42 of the screw 41. In particular, the nut 5 is a round nut whose outside diameter is less than the width of the grooves 62.

The threaded rod 42, the hole smooth 26 of retractor 2 and the tapped hole 33 of the tensioner 3 are sized so that the rod threaded 42 can to be brought to get through the hole smooth 26 < and to

turn and slide freely relative to the latter, but to be screwed into the tapped hole 33.

In the assembled position, the device 1 is as illustrated in Figures 2 and 3a to 3d: the screw 4 has been threaded into the smooth hole 26, the screw head 42 being in contact with the outer side 20b of the spacer 2, the nut 5 has been screwed onto the threaded rod 42 until it comes close to or in contact with the inner side 20a of the spacer 2, then the tensioner 3 has been screwed, through its tapped hole 33, to the threaded rod 42.

If one refers more specifically to Figures 3b, 3c and 3d, it can be seen that the wings 32 of the tensioner are slightly wider than the bar 20 constituting the spacer 2, except at the level of the free end region 32a where they are the same width.

Referring now to Figure 4, we can see that there is shown a device 1 'according to a variant of the embodiment described above, a variant which differs from the latter only in that the spacer 2 'has a flared U shape similar to the shape of tensioner 3. Thus, spacer 2' comprises three rectilinear segments: a central part 21 'and two lateral parts 22' connected by two elbows 23 '. The free end face 22a 'of each lateral part 22' will constitute a bearing face according to the present invention.

Furthermore, although the support ribs have been omitted on the spacer 2 ', they can of course be provided.

We will now describe the principle of tensioning a canvas to be painted with the device 1 with reference to Figures 5 to 8.

If we refer first to Figure 8, we can see that a frame C for canvas according to the present invention is formed by four uprights 6 each having two ends 61 bevelled at 45 °. At each end 61 is made, parallel to the front 60a and rear 60d sides of the upright 6, a straight through groove of the mortise type 62, namely that the groove 62 has a constant width and opens both on the inner side 60c and on the outer side 60d of the upright 6.

As can be seen in Figure 5, which is an enlarged view of the upper left corner of the frame C of Figure 8, a first function of the device 1 according to the present invention is to assemble one to another two uprights 6 arranged at 90 °. To do this, the device 1 the manner of entering is dimensioned according to the uprights 6 to be assembled: the width of the grooves 62 is at least slightly greater than the width of the spacer 2 but is slightly less than the width of the wing 32 of the tensioner 3, for the reasons which will be explained below. Furthermore, the depth of the grooves 62 is such that the bearing faces 24a of the lateral parts 24 of the spacer 2 are in contact with the bottom 62a of the grooves 62.

The assembly can be done as follows: first of all, the user first stands 6 and pushes a wing 32 of a tensioner 2 into each of the two grooves 62, one after the other, until that the ribs 34 come into contact with the end faces of the first upright 6. The width of the wing 32 being slightly greater than that of the groove 62, this introduction is made at least slightly by force, so that the tensioners 3 and the upright 6 can no longer move relative to each other except in the longitudinal direction of the upright 6. The tensioner 3 is placed closer to the inside of the assembled uprights 6 than to the outside.

In this position, the spacers 2 are also located in the grooves 62, with each bearing face 24a against the bottom 62a of the groove 62 and the ribs 27 also bearing against the end faces 61 of the upright 6.

sized

In the example shown, the spacer 2 is so that in the initial position, the free end face of each lateral portion 24 is generally in the plane of the interior side 60c of the first upright 6 and the exterior side 20b of the segment intermediate 22 is generally situated in the plane of the external side 60d of the first upright 6.

It can be emphasized here that the ribs 27 and 34 make it easier to center the spacer 2 and the tensioner 3 in the grooves 62.

The user proceeds in the same way as above on a second upright 6.

Then, the user forcibly mounts a first end of the third and fourth uprights 6 on the free wings 32 of the tensioners 3 already mounted on the first upright 6. The spacers 2 are then received in the grooves 62 of the third and fourth uprights 6, which is possible due to the fact that the round nut 5 is of smaller outside diameter than the width of the grooves 62.

It is emphasized here that the force fitting of the wings 32 into the grooves 62 is facilitated by the presence of the inclined lateral surfaces 32b and of the free end regions 32a of smaller width, which saves the user from having to exercise a significant effort, and therefore allows it to correctly position the tensioner 3. The presence of the nut 5 allows the spacer 2 and the screw 4 to be retained in position during this force fitting.

It is mentioned here that it is possible, according to the present invention, to pre-machine in the side walls of the grooves 62 two rectilinear notches facing one another and in which the user can slide the edges of the wings 32, without forced mounting.

Finally, the user simultaneously and forcibly introduces into the grooves 62 of the second ends of the third and fourth uprights 6 the tensioners 3 already mounted in the second upright 6, and thus obtains the chassis C as shown in FIG. 8.

It is emphasized here that one of the advantages of the present invention is that the device 1 is used to assemble and therefore to keep the uprights in position: the different uprights 6 are thus maintained in the assembled state during assembly of the chassis C and , although a slight deformation of the deformable parallelogram type can be encountered with the chassis C once it has been mounted, in particular for larger chassis, the chassis C remains in one piece and can be manipulated hand by the user, without the user having to hold the frame C with his other hand to keep it mounted.

Once the devices 1 have all been placed in the position of FIGS. 5 and 6, they can each be actuated to widen the frame C, and thus to stretch a canvas fixed to it, by simple rotation of the screw 4.

It is easily understood that the user can turn the screw 4 with a screwdriver, the screw head 41 of which is accessible from outside the frame C through the grooves 62, and that the rotation of the screw 4 in a first direction, in particular clockwise, will cause it to move in translation in the direction of the tensioner 3 (namely towards the center of the frame C) because the latter is fixed, and thus serves as an anchoring, while the rotation of the screw 4 in the opposite direction will move it in translation in the opposite direction.

If we also refer to FIG. 7, it is also easily understood that, when the screw 4 is moved towards the tensioner 3, the screw head 41 will push the spacer 2 towards the tensioner 3. Since the spacer 2 is in contact by its bearing faces 24a with the bottom of the grooves 62, the displacement of the spacer 2 towards the tensioner 3 leads to a separation of the two uprights 6: the spacer 2 will slide in the grooves 62 by pressing on the bottom 62a of these, which will force the uprights 6 to move, relative to the respective wing 32, in translation in the longitudinal direction of the respective upright 6. Thus, the uprights 6 are spaced from each other while remaining perpendicular to each other, as can be seen in Figure 7.

The variant embodiment of the device 1 ′ illustrated in FIG. 4 operates on the same principle as that described above: the spacer 2 ′ is dimensioned so that in the initial position the bearing faces 22a ′ are in contact with the bottom 62a of the grooves 62, so that they will separate the uprights 6 after rotation of the screw 4 clockwise.

It is emphasized here that the embodiment of the device 1 of Figures 1 to 3d has the advantage, compared to this alternative embodiment, of presenting bearing faces which offer a greater contact surface, in particular over a greater length. of the groove 62, which makes it possible to improve the stability of the assembly and to ensure that the frame C retains a rectangular shape by limiting a deformation of the deformable parallelogram type.

The method will now be described for the installation and tensioning of a canvas to be painted on the frame C, with reference to Figures 8 to 11.

Initially, the user assembles the chassis C in the manner described above, with the devices 1 in the initial position.

Conventionally, the user will apply a fabric T to the front sides 60a of the frame C, and will fold the fabric T along the outer sides 60d then the rear sides 60b, before fixing the fabric T to the frame C by any means suitable, such as by stapling. The fixing will be done along the uprights 6, however leaving free the fabric T in the region of each corner of the frame C, so as to obtain a frame C and a fabric T as shown in Figures 9 and 10.

The user then actuates the devices 1 so as to tension the fabric T at the desired tension value. Preferably, the user will actuate successively, and equally, a first device 1 to slightly spread the uprights 6 that it assembles, then a second device 1, then a third device 1 and a fourth device 1, before returning to the first device 1 to activate it. This can be done iteratively up to the desired voltage value.

Once the fabric T is properly tensioned, it remains only for the user, either to fold over the rear of the frame C the free part of the fabric T by forming overlapping folds, before fixing them by stapling, either to introduce the free part of the fabric T in the interval between two adjacent uprights, created by the spacing between them, using any appropriate means, such as for example the screwdriver which was used to actuate the screws 4.

For this last step, as illustrated in FIG. 11, it is possible to use a key 7 according to the present invention, shown in plan view in FIG. 12. This key is in the form of an elongated flat piece 70 of thickness small enough to be inserted into the gap created between two adjacent uprights as shown in Figure 11. The key 7 includes a grip portion 71, by which the key 7 can be entered by the user, and a portion of actuation 72, which has in the example shown a width less than that of the gripping part 71.

Two generally triangular teeth 73 extend from the free transverse edge of the actuating part 72, teeth 73 with the help of which the user can release staples 6 without substantially deforming the latter.

A first circular through hole 74 is also provided in the actuating part 72, which hole 74 is of a small diameter chosen to be able to be used by the user to tear off staples out of an upright 6.

Finally, a second circular through hole 75, of larger diameter than the hole 74, is provided in the gripping part 71, hole 75 by which the key 7 can be hung on a support, such as for example a conventional key holder.

It is understood that the particular embodiment which has just been described has been given by way of non-limiting indication and that modifications can be made without departing from the scope of the present invention.

Claims (12)

1 - Device (1; 1 ') for tensioning canvas on a preferably wooden chassis, intended to assemble two chassis uprights (6) perpendicular to each other, the ends (61) of which 45 ° beveled effect for a simple bevel-type assembly of the two uprights (6) and each have a groove (62) opening into said end (61) and having a bottom (62a) perpendicular to the longitudinal axis of the upright (6 ) respective, the device (1) being characterized in that it comprises: - a spacer (2; 2 '), which comprises a central part (21, 21') having two ends from each of which extends a lateral part (22, 24; 22 ') intended to be received in the groove (62) of a respective upright (6) among the two uprights (6), each lateral part (22, 24; 22 ') having a bearing face (24a; 22a') intended, in the position of use, in which the two uprights (6) are assembled, to be in contact with the bottom (62a) of the groove (62), - a tensioner (3), which comprises a central part (31) from which extend fastening means (32) capable, in the use position, of making the tensioner (3) integral with the two uprights (6), while allowing a displacement in translation of each upright (6) relative to the tensioner (3) , along the longitudinal axis of said upright (6), the tensioner (3) being positioned on the inner side of the uprights (6) assembled, - a member (4) for connecting the 'spacer (2; 2') to the tensioner (3), and - means (41, 42, 33) for bringing the spacer (2; 2 ') towards the tensioner (3), which approximation means (41, 42, 33) being able, in the position of use, to move towards the tensioner (3) the spacer (2; 2') which is located the outer side of the uprights (6) assembled, which displacement of the spacer (2; 2 ') will cause each bearing face to push on the bottom (62a) of the respective groove (62) and thus to move each upright ( 6) in translation along the longitudinal axis of the upright (6) so as to separate one from the other the two uprights (6) while keeping them perpendicular to each other. 2 - Device (1; 1 ') for tensioning canvas on a frame according to claim 1, characterized in that the central part (21; 21') of the spacer (2; 2 ') has its center a smooth through hole (26), the central part (31) of the tensioner (3) has in its center a threaded through hole (33) which is aligned, in the use position, with said smooth through hole (26), l the connecting member (4) being a screw (4) having a screw head (41) and a threaded rod (42) dimensioned to extend in a freely sliding and rotary manner in the smooth through hole (26) of the spacer (2; 2 ') then be screwed into the threaded hole (33) of the tensioner (3), so that a rotation of the screw (4) in a first direction brings the spacer (2; 2') to approach the tensioner (3), said approximation means thus being formed by the screw (4) and the tapped hole (33). 3 - Device (1; 1 ') for tensioning canvas on a chassis according to claim 2, characterized in that it further comprises a nut (5) capable of being screwed onto the threaded rod (42) of the screw (4), in the vicinity of the spacer (2; 2 ') so as to retain it in position when the tensioner (3) is secured to the uprights (6) of the chassis (C), the nut (5) being further dimensioned so as to be able to extend inside the grooves (62) of the uprights (6), and is preferably a round nut. 4 - Device (1) for tensioning canvas on a frame according to one of claims 1 to 3, characterized in that the spacer (2) is in the form of a bar (20) having a first rectilinear segment constituting the central part (21) of the spacer (2), two intermediate segments (22) each extending from a respective end of said first segment, at an angle of 45 ° relative to it ci, and two end segments (24) each extending from one end of a respective intermediate segment (22), at an angle of 90 ° with respect thereto. 5 - Device (1; 1 ') for tensioning canvas on a frame according to one of claims 1 to 4, characterized in that the tensioner (3) has a flared U shape, the bottom of which is constituted by the central part (31) of the tensioner (3) and each of whose two branches is formed by a lateral part (32) extending from a respective end of the central part (31), said securing means (32 ) being formed by said two lateral parts (32), the tensioner (3) being preferably formed by a flat piece (30). 6 - Device (1; 1 ') for tensioning canvas on a frame according to claim 5, characterized in that the lateral parts (32) of the tensioner (3) have a width greater than that of the spacer (2 ; 2 '), in particular that of the lateral parts (22, 24; 22') of the spacer (2; 2 '), for securing to the uprights (6) by force fitting of the lateral parts (32) of the tensioner (3) in the grooves (62) of the uprights (6). 7 - Device (1; 1 ') for tensioning canvas on a frame according to one of claims 5 and 6, characterized in that the width of the lateral parts (32) of the tensioner (3) is smaller in a free end region (32a) of the lateral part (32) than in the rest of the lateral part (32), where it is generally constant, so as to facilitate the introduction of the lateral part (32) into the groove (62) of an amount (6). 8 - Device (1; 1 ') for tensioning canvas on a frame according to one of claims 1 to 7, characterized in that a support rib (27, 34) is provided on each of the two walls lateral (21, 31) of the spacer (2; 2 ') and / or of the tensioner (3), in the center of said central part (21, 31), the support ribs (27, 34) being, in the position of use, parallel to the connecting member (4). 9 - Kit for assembling a canvas frame (C), preferably made of wood, and tensioning a canvas on the frame (C), characterized in that it comprises at least four uprights (6) of frame (C) whose ends (61) are bevelled at 45 ° for a simple bevel-type assembly between each adjacent upright (6) and each have a groove (62) opening into said end (61) and having a bottom (62a) perpendicular to the longitudinal axis of the respective upright (6), and at least four devices (1; 1 ') for tensioning canvas on a frame according to any one of claims 1 to 8. 10 - Kit according to claim 9, characterized in that it further comprises a key (7) in the form of an elongated flat part (70) comprising a gripping part (71) from 5 which extends an actuating part (72), the key (7) being preferably provided with a first circular through hole (74), so as to allow the user to pull staples out of a frame upright (6). 11 - Kit according to claim 10, characterized 10 by the fact that two teeth (73) extend parallel to the longitudinal direction of the key (7) and from the free transverse edge of the actuating part (72), so as to allow the user to remove staples (6) from the frame, without substantially 15 distort. 1/6 2S 24 q 2/6