EP3893698B1

EP3893698B1 - Body support

Info

Publication number: EP3893698B1
Application number: EP19897336.4A
Authority: EP
Inventors: Mikael Signarsson; Martin KRAMBERG
Original assignee: Native Bionics Scandinavia AB
Current assignee: Native Bionics Scandinavia AB
Priority date: 2018-12-11
Filing date: 2019-12-09
Publication date: 2023-06-07
Anticipated expiration: 2039-12-09
Also published as: WO2020122794A1; EP3893698C0; EP3893698A1; EP3893698A4; SE1851552A1; SE543779C2

Description

The present invention relates to a body support, and in particular to a body support for the body of a user lying belly down, using a book, a tablet computer, a smartphone or similar.
The problem of ergonomically poor seating postures in users of tablet computers, smartphones and similar is well-known. Frequently, the prolonged use of such devices with poor posture results in strain and in worst case neck injuries.
One problem is that common postures when using such devices include the neck of the user being bent forward, putting strain on the muscles supporting the neck and the head of the user. These problems may also arise when performing similar activities, such as reading books.
In WO 2017/200448 A1 , a body support is described, comprising a slanting chest resting surface and elbow rests. When a user lies belly down on such a body support, the spine of the user is held in an ergonomically correct posture, due to a slightly concave shape of the chest support.
Similar devices are disclosed in GB 2262225 A , US 4987625 A and US 20150289664 A1 .
Common to all these devices is that they are both quite bulky, and not optimised for storing. They are also not suitable for users of different sizes. For instance, one and the same device cannot be used by both an adult and a child with ergonomically correct results.
Another problem is that when used during the performing of a task requiring some electronic device, a book or similar, the user has to hold the device in question with his or her hands, or alternatively keep the device on the floor in front of the body support.
Another problem is that the neck of the user still risks not assuming a proper posture during such use. For instance, it is possible for the user lying belly down on the device in question to still have his or her neck bent forward in an unhealthy posture, depending on where a screen, a book page, etc., is located.
Moreover, USD748616 and USD643845 describe stands for portable electronics.
KR 200 436 116 Y1 discloses a body support for supporting a user lying on the floor.
The present invention solves the above described problems, and provides a body support which, in addition thereto, is suitable both for device or book use and also for general usage, such as when watching tv, resting or talking with family and friends.
Hence, the invention relates to a body support associated with a use orientation, arranged to allow a user to lie belly down in a use position on the body support, the body support comprising a first part, in the form of a chest support part, in turn comprising a first surface, in the form of a slanting chest support surface, arranged to, when the body support is in said use orientation, support the chest of a user in said use position; and a second part, in the form of a combined elbow and device support, in turn comprising a second surface, in the form of a lower arm support surface, arranged to, when the body support is in said use orientation, support the lower arms of a user in said use position with the user's elbows resting on second surface, which body support is characterised in that, when the body support is in said use orientation, the second surface slants towards the same direction as the first surface, in that the second part further comprises a device support means, arranged to support a device to be viewed by the user in said use position, and in that the device support means is arranged to support the device from below so that the whole supported device is arranged above said end edge of the first part.
In the following, the invention will be described in detail, with reference to exemplifying embodiments of the invention and to the enclosed drawings, wherein:

Figure 1 is a perspective view of a first exemplifying embodiment of a body support according to the present invention, in a use orientation of the body support;
Figure 2 is a simplified side view of a second exemplifying embodiment of a body support according to the present invention in a use orientation of the body support, as well as of a user lying belly down, in a use orientation of the user, on said body support;
Figure 3a is a side view of a first part of a third exemplifying embodiment of a body support according to the present invention;
Figure 3b is a top view of the first part of the body support shown in Figure 3a; and
Figure 3c is a side view of a second part of the said third exemplifying embodiment.

In all Figures, the last two digits of each reference numeral indicate the same or corresponding parts.
Figure 2 is not drawn to scale; however Figures 1 and Figures 3a-3c, respectively, show a respective example of an embodiment of the present invention which is generally drawn to scale.
Hence, Figure 1 shows a body support 100 according to the present invention. The body support 100 is associated with a use orientation, arranged to allow a user P (see Figure 2) to lie belly down in a use position on the body support 100 in question. This use orientation is generally illustrated in Figures 1 and 2, and involves a first 110; 210 and a second 120; 220 part of the body support 100; 200 in question standing directly on a supporting surface (not shown), such as an indoors or outdoors floor or the ground. In this use orientation, the below-discussed slanting surfaces 111, 112, 121, 122; 211, 212, 221, 222 are arranged facing generally upwards, being visible when viewed vertically from above. In the use orientation, the first 110; 210 and second 120;220 parts are arranged one next to the other, such as in direct physical contact to each other or (as may be the case) joined together as one single, connected part (see below). In the use orientation, the fourth surface 112; 212 (see below) may connect directly to the second surface 121; 221.
In the use orientation, the body support 100; 200; 300 is generally associated with a longitudinal L direction, which corresponds to the left-right horizontal direction in Figures 2-3c. The body support 100 comprises a first part 110, in the form of a user P chest support part. This first part 110 in turn comprises a first surface 111 having an end edge 111e. The end edge 111e, which may separate the first surface 111 from the fourth surface 112 (see below); which also may form the highest point of the first part 110 in said use orientation; and which may be horizontally or at least substantially horizontally extending, may also be arranged to run perpendicularly or at least substantially perpendicularly to the said longitudinal direction L of the body support 100.
Furthermore, the first surface 111 is in the form of a slanting user P chest support surface, which is arranged to support the chest of a user P , when the body support 100 is in said use orientation and the user lies belly-down in said use position. In this use position, in particular for smaller users such as children, the first surface 111 can be arranged in relation to the second surface 121 so that the armpits of the user P rest over an said end edge 111e of the first surface 111. For larger users, the armpits of the user may be located above the end edge 111e, such as substantially vertically above the end edge 111e, in said use orientation. Preferably, the first surface 111; 211; 311 is long and wide enough to support the user P down to at least the waist of the user P.
In this use position, the majority of the weight of the user P may be supported (via the upper parts of the user's P body) by the first surface 111, even though in some cases the first surface 111 may be short enough so as to allow the user's P waist to be outside of the first surface 111 in the use position. At the same time, the majority of the weight of the user's P head H is supported, primarily via the user's P elbows and forearms, on the second surface 121 (see below). Hence, the end edge 111e may support the user's P armpits, but preferably the end edge 111e supports a weight of the user P which is less than the weight supported by the second surface 121. In some cases, the edge 111e may even not be in contact with the user's P armpits. It is realized that, since the end edge 111e may be made from soft material, that the end edge 111e "supports" the user's P armpits, this means that it is the first part 110; 210; 310 comprising the end edge 111e that supports said armpits from an area of the first part 110; 210; 310 comprising the end edge 111e. For larger users, the surface 121 and the surface 111 may jointly support a majority of the user's body weight when in said use orientation.
As mentioned, the body support 100 also comprises a second part 120, in the form of a combined user P elbow and device E support. The second part 120 comprises a second surface 121, in the form of a user P elbow and lower arm support surface. When the body support 100 is in said use orientation and the user P is in the use position, lying belly down with the user's P elbows resting on the second surface 121, the second surface 121 is arranged to support the lower arms of the user P.
According to the invention, when the body support 100 is in the use orientation, the second surface 121 slants towards the same direction as the first surface 111. This is most clearly illustrated in Figures 1 and 2, where it is clear that the first 111; 211 and second 121;221 surfaces together form a zig-zag-like pattern, both slanting upwards to the left in said Figures, interrupted by the downwards offsetting fourth surface 112; 212, slanting downwards to the left (see below).
In particular, a lower-most part of the second surface 112 may be lower than the end edge 111e, so that the user's P elbows will be supported on the second surface 112 from a point on the second surface 112 arranged below the end edge 111e.
Further according to the invention, the second part 120 also comprises a device support means 123, arranged to support a device E to be viewed by the user P in said use position.
The device E may be any type of electronic equipment having a screen, such as a smartphone, a tablet computer or similar; a book or paper; or any other item which the user desires to look at or view. Preferably, the device E is of the type requiring some physical interaction from the user's P hands, such as for typing, scrolling, page turning and similar. Hence, in the use position, the user P will typically lie forearms/hands forward, having her hands close to the device E.
Also according to the present invention, the device support means 123 is arranged to support the device E from below (of the device E), so that the whole supported device E is arranged above said end edge 111e of the first part 110.
The present inventors have discovered that this provides, in a simple design, a very ergonomic user P experience when lying in said use position on the use-oriented body support 100; 200; 300. In particular, the combination of the slanting first surface 111 of the first part 110 and the slanting second surface 121 of the second part 120 will support the user's P chest and elbows so as to achieve an ergonomically correct user posture for prolonged lying. The fact that the device E is supported above the end edge 111e guarantees that the user P does not lie with her head H bent forward, but instead encourages the user P to hold her head H in an upright position. The combination of the posture resulting from the slanting surfaces 111, 121 and the upright position of the head H provides an ergonomically very advantageous user P position, useful for lying during prolonged time periods for avoiding musculoskeletal injuries resulting from strain due to ergonomically incorrect postures.
Especially advantageous embodiments will be described in the following.
As is illustrated in the Figures, the body support 100; 200; 300 may be provided as a set of parts, which parts can be arranged one adjacent to the other on a support so as to form the body support in question. More particularly, the first 110; 210; 310 and second 120; 220; 320 parts may be arranged as separate parts, and arranged to be placed one next to the other to form the body support 100; 200; 300 in the above defined use orientation of the body support. An example of the first part 310 is illustrated in Figures 3a and 3b; an example of the second part 320 is illustrated in Figure 3c; and a respective example of the assembled parts 110, 120; 210, 220; 310, 320 is illustrated in Figures 1 and 2. Hence, it is preferred that the parts 110, 120; 210, 220; 310, 320 are placed together on the support with direct physical contact one to the other, second surface 121; 221; 321 adjacent to fourth surface 112; 212; 313 as is illustrated in Figures 1 and 2.
Such modularity provides not only more flexible storage, but also the possibility to use the first 110; 210; 310 and second 120; 220; 320 parts separately. However, in other embodiments, the whole body support is provided as one single, integrated part.
The body support 100; 200 may provide the desired function for the user P if the parts 110, 120; 210, 220 are simply placed together on the support in said use orientation, without being attached one to the other.
However, it is preferred that the first 110; 210; 310 and second 120; 220; 320 parts are arranged with cooperating fastening means 230 (see Figure 2), such as Velcro^® or button fastening means, arranged to cooperatively and releasably fasten the first part 210 to the second part 220 so as to form the body support 200 in question. In Figure 2, the fastening means 320 is illustrated as a separate part, for fastening to corresponding cooperating fastening means (such as a Velcro^® strip, a button eye or similar) to each of the parts 210; 220. However, it is realized that the cooperating fastening means may include a part permanently attached to the first 210 or the second 220 part, and arranged to detachably fasten to the other part 220 or 210, respectively. A special case of the latter is that the fastening means 230 comprises a pair of cooperating button/eye or Velcro^® fastening means, each permanently fastened to a respective part 210, 220 each, for direct and detachable attachment of the first part 210 to the second part 220.
In the case in which the fastening means 230 is a separate part (as illustrated in Figure 2), it is preferably a flexible strip having a Velcro^® upper surface, arranged to cooperate with a corresponding Velcro^® lower surface on each of the first 210 and second 220 parts, for easy attachment by simply placing the part 210; 220 in question on the fastening means 230 on the support.
In this and other cases, the body support 200, and in particular the fastening means 230 and/or the first 210 and/or the second 220 part, comprises anti-slip means 240 on a bottom side of the body support 100 when the body support 100 is in the use orientation. Hence, the fastening means 230 may comprise such anti-slip means 240 on its opposite side from the said Velcro^® upper surface.
Such an anti-slip means 240 may, for instance, be in the form of an exposed latex or rubber surface, or any other high-friction surface arranged to directly abut a support on which the body support 200 rests in its use orientation.
As is illustrated in the Figures, the first surface 111; 211; 311 has a concave shape (bulging down as illustrated for instance in Figure 1), having a radius of curvature 111r of between 1.5 and 3 meters, which radius of curvature is substantially within this interval across the entire longitudinal L length of the first surface 111; 211; 311. The part of the first surface 111; 211; 311 which is curved this way is preferably between 30 cm and 60 cm of longitudinal L length.
As will be described below, the first 110; 210; 310 and second 120; 220; 320 parts may be manufactured from soft or rigid material. It is realized that the curvature of the first surface 111; 211; 311 described herein is achieved when the user P rests on the first surface 111; 211; 311, supported thereon in said use position of the user P and in said use orientation of the body support 100; 200; 300. Hence, the material of the first part 110; 210; 310 may yield to a certain extent due to the weight of the user P, and as a result achieve said radius of curvature.
Also, the curvature of the first surface 111; 211; 311 may preferably be arranged to connect to the support of the body support 100; 200; 300 in a soft, substantially tangential way, as is illustrated in the Figures.
Such a first surface 111; 211; 311 curvature, in combination with the properties of the second part 120; 220; 320 as described herein, has been found to result in an ergonomically correct spine posture of the user P when in said use position.
The first part 110; 210; 310 and/or the second part 120; 220; 320 may have a generally triangular vertical cross-section, along said longitudinal direction L, when the body support 100; 200; 300 is in said use orientation.
Regarding the second surface 121; 221; 321, this is preferably also concave, having a radius of curvature 121r of between 0.5 and 2 meters, preferably between 0.8 and 1.2 meters. What has been said about the first surface 111; 211; 311 curvature and its relation to the weight of the user P and the material of the first part 110; 210; 310 yielding under this weight, is correspondingly applicable to the second surface 121; 221; 321; the weight posed thereon by the user's P elbows and forearms; and the material of the second part 120; 220; 320.
The second surface 121; 221; 321 has smoothly bent side edges (running along the longitudinal direction L), curving in a non-sharp, continuous manner into respective lateral sides of the second part 120; 220; 320. Furthermore, the second part 120; 220; 320 may be made from one or several materials providing a resilience to the weight of a user thereon which is substantially the same or at least similar across substantially the whole second surface 121; 221; 321, such as across a width section of at least 30 cm. This may, for instance, be achieved using a rigid (such as made from EPS) core part, covered by a soft padding material providing surface comfort. Such a construction will allow the user P to adjust her position slightly during use, which is ergonomically advantageous.
Irrespectively of the absolute value of the radii of curvatures 111r; 121r, the concave radius of curvature 121r of the second surface 121; 221; 321 is preferably about half of the concave radius of curvature 111r of the first surface 111; 211; 311. See Figure 3c for a concrete example of this.
Such a second surface 121; 221; 321 curvature has been found to result in excellent ergonomics, when combined with the properties of the first part 110; 210; 310 as described herein.
When the body support 100; 200; 300 is in said use orientation, a horizontal plane projection of the second surface 121; 221; 321 may run, in said longitudinal direction L, at least between the said end edge 111e; 211e; 311e and the device support means 123; 223; 323. The second surface 121; 221; 321 preferably has the above described curvature across this whole longitudinal direction L extent of the second surface 121; 221; 321.
Turning to the device support means 123; 223; 323, the purpose of this is to support the device E in a secure and simple manner. One way of achieving this is that the device support means 123; 223; 323 is in the form of a step in a vertical cross-section of the second surface 121; 221; 321, as is illustrated in the Figures. Then, the device E is arranged to rest with a lower edge of the device E on this step. The said vertical cross-section is the vertical cross-section when the body support 200 is in use orientation as is shown, for instance, in Figure 2 (plan of paper in Figure 2).
Furthermore, the second surface 121; 221; 321, as seen in the same vertical cross-section, may continue past the said step in the longitudinal direction L, away from the first part 110; 210; 310 when the body support 100; 200; 300 is in said use orientation, providing a third surface 122; 222; 322 in the form of a slanting supporting surface arranged to support a back side of the device E resting on the said step.
This provides a very sturdy and simple way of achieving an ergonomically correct placement of the device E in relation to the user P.
Specifically regarding the said third surface 122; 222; 322, this surface may be arranged to slant at an angle 122a (see Figure 1) of between 10° and 40°, preferably between 25° and 35°, from the vertical. The third surface 122; 222; 322 may comprise a substantially flat surface against which the device E, supported on the support means 123; 223; 323, may lean.
In order to achieve an ergonomically correct user P posture in said use position, the device E may be located, when the body support 100; 200;300 is in said use orientation and the device E is supported by the device support means 123; 223; 323, at a horizontal distance of between 0.3 and 0.5 m from the said end edge 111e; 211e; 311e. Also, the height of the device support means 123; 223; 323 may be arranged such that a horizontal gaze G of the user P in said use position will intersect the device E, preferably intersect the device E near a vertical centre of the device E or near a vertical centre of a screen of the device E.
Moreover, the device support means 123; 223; 323 may be arranged to support a lower side of the device E from below at a height of between 0.15 and 0.25 m, preferably between 0.18 and 0.22 m, from the surface supporting the body support 100; 200; 300 in said use orientation.
It is realized that, in order to optimize the user experience from an ergonomic point of view, it is possible to adapt the body support 100; 200; 300 for a particular user P size and/or a particular type/size of device E; or it is possible to provide an adjustment means for adjusting the height of the device support means 123; 223; 323 at use time. However, the present inventors have discovered that, when the geometric principles described herein are observed regarding the first 110; 210; 310 and second 120;220; 320 parts, sufficiently ergonomic results are achieved across a wide spectrum of user P sizes and for many commonly used devices, such as handheld electronic devices and books, without having to provide such adjustability. Hence, in a preferred embodiment, no adjustability is provided, such as for the device support means 123; 223; 323, for adjusting at use-time the height of the supported device E.
The end edge 111e; 211e; 311e may be arranged at a height from said surface supporting the body support 100; 200; 300 of between 0.1 and 0.2 m, preferably between 0.12 and 0.16 m.
To even further improve the user P experience from an ergonomic perspective, the first part 110; 210; 310 may also comprise a fourth surface 112; 212; 312, as is illustrated in the Figures. The fourth surface 112; 212; 312 may then be in the form of a (forward) slanting user P upper arm support surface, arranged to support the upper arms of the user P in the use position at an angle 112a (see Figure 1), slanting downwards in a direction opposite to a slanting direction of the first surface 111; 211; 311. The slanting angle is preferably more than 45°, preferably between 0° and 30°, from the vertical.
Further preferably, when the body support 100; 200; 300 is in the use orientation, and as seen in the above mentioned vertical cross-section along the longitudinal direction L, a tangent to the second surface 121; 221; 321 at a lower end of the second surface 121; 221; 321 is arranged to intersect a tangent to the fourth surface 112; 212; 312, or to intersect the fourth surface 112; 212; 312 itself, at a height from the (floor) surface supporting the body support 100; 200; 300 of between 0.06 and 0.08 m.
As described above, the fourth surface 112; 212; 312 preferably slants downwards in the forward longitudinal direction L, and the first 110; 210; 310 and second 120; 220; 320 may be arranged to be in direct contact with each other in said use orientation. As shown in Figures 1 and 2, it may also so that the shape of the second part 120; 220; 320 at the point of contact with the first part 110; 210; 310 is complementary to a corresponding contacting shape of the first part 110; 210; 310. In practice, the second part 220 may comprise a slanting fifth surface 224 (see Figure 2) with a slanting angle corresponding to the slanting angle of the fourth surface 212 (which angle may be the same as the slanting angle 112a above the above the intersection) below the intersection with the second surface 221 tangent, so that the fourth 212 and fifth 224 surfaces are substantially parallel and in contact with each other in said use orientation of the body support 200. In this case, the above-discussed fastening means 130 may comprise interacting fastening means, such as Velcro^® fastening means, arranged directly on the fourth 212 and fifth 224 surfaces, so that they are automatically activated when the first 210 and second 220 are brought together so as to form the body support 200 in said use orientation.
Either one or both of the first 110; 210; 310 and second 120; 220; 320 parts may advantageously be manufactured from a foam material, having a textile or non-woven surface cover. Such foam material may be provided throughout the part 110, 120; 210, 220; 310, 320 in question, or be provided with a rigid core, such as a core of EPS foam or other rigid plastic material.
Furthermore, either one or both of the first 110; 210; 310 and second 120; 220; 320 parts may have a substantially constant vertical respective cross-section taken along a main slanting direction of the first surface 111; 211; 311, in other words taken along the forward longitudinal direction L, when the body support 100; 200; 300 is in said use orientation.
In Figures 3a-3c, measurement values are indicated for selected distances, angles and radii of curvature, for an exemplifying embodiment of the present invention. All distances and radii are given in mm. In particular:

A total length of the first surface 311 is 437.34 mm.
A radius of curvature of the first surface 311 is 2000 mm.
A total length of the first part 310 is 484.6 mm.
A total height of the first part 310 is 142.55 mm.
A total width of the first part 310 is 442.26 mm.
A width of the first part 310 at a lower end of the first part 310 is 320.34 mm.
A total length of the second surface 321 is 301 mm.
A radius of curvature of the second surface 321 is 1000 mm.
A height of a lower part of the second surface 321 is 74 mm.
An angle, to the horizontal, of a finishing surface of the second part 320, extending between a lower part of the second surface 321 and a support for the second part 320 such as a floor on which it stands, is 63.5°.
A width of a support surface of the device E support means 323 is 20 mm, its height above said support surface is 200 mm, and an angle between said support surface and the third surface 322 is 70°.
A width of the third surface 322 is 142 mm, and its angle to the vertical is 30°.
An angle to the horizontal of a slanting finishing surface, arranged facing away from the first part 310 in said use orientation of the body support 300, is 63.5°.
A total height of the second part 320 is 324 mm.

All these values may be varied by ±10%, as long as the principles described herein, for instance regarding various relations between said values, are respected.
For instance, the body support described above may comprise more features and details than mentioned herein. It may also be produced with different covering materials and with additional aesthetic properties.
In general, all which has been said regarding one of the three embodiments shown in the Figures 1; 2; and 3a-3c, respectively, is equally applicable to the other embodiments.
Hence, the invention is not limited to the described embodiments, but can be varied within the scope of the enclosed claims.

Claims

Body support (100;200;300) associated with a use orientation, arranged to allow a user to lie belly down in a use position on the body support (100;200;300), the body support (100;200;300) comprising
a first part (110;210;310), in the form of a chest support part, in turn comprising a first surface (111;211;311), in the form of a slanting chest support surface, arranged to, when the body support (100;200;300) is in said use orientation, support the chest of a user (P) in said use position; and

a second part (120;220;320), in the form of a combined elbow and device support, in turn comprising a second surface (121;221;321), in the form of a lower arm support surface, arranged to, when the body support (100;200;300) is in said use orientation, support the lower arms of a user (P) in said use position with the user's (P) elbows resting on second surface (121;221;321),

wherein, when the body support (100;200;300) is in said use orientation, the second surface (121;221;321) slants towards the same direction as the first surface (111;211;311),

in that the second part (120;220;320) further comprises a device support means (123;223;323), arranged to support a device (E) to be viewed by the user (P) in said use position, and

in that the device support means (123;223;323) is arranged to support the device (E) from below so that the whole supported device (E) is arranged above an end edge (111e;211e;311e) of the first part (110;210;310),

characterised in that the first surface (111;211;311) is concave, having a radius of curvature (111r) of between 1.5 and 3 meters.
Body support (100;200;300) according to claim 1, characterised in that the first (110;210;310) and second (120;220;320) parts are arranged as separate parts arranged to be placed one next to the other to form the body support (100;200;300) in said use orientation.
Body support (100;200;300) according to claim 2, characterised in that the first (110;210;310) and second (120;220;320) parts are arranged with cooperating fastening means (230), such as Velcro^® or button fastening means, arranged to cooperatively and releasably fasten the first part (110;210;310) to the second part (120;220;320) so as to form the body support (100;200;300).
Body support (100;200;300) according to any one of the preceding claims, characterised in that the first part (110;210;310) has a generally triangular vertical cross-section when the body support (100;200;300) is in said use orientation.
Body support (100;200;300) according to any one of the preceding claims, characterised in that the second surface (121;221;321) is concave, having a radius of curvature (121r) of between 0.5 and 2 meters, preferably about half of a concave radius of curvature (111r) of the first surface (111;211;311).
Body support (100;200;300) according to any one of the preceding claims, characterised in that, when the body support (100;200;300) is in said use orientation, a horizontal plane projection of the second surface (121;221;321) runs at least between the said end edge (111e;211e;311e) and said device support means (123;223;323).
Body support (100;200;300) according to any one of the preceding claims, characterised in that the device support means (123;223;323) is in the form of a step in a vertical cross-section of the second surface (121;221;321), when the body support (100;200;300) is in said use orientation, so that the device (E) is arranged to rest with a lower edge of the device (E) on said step.
Body support (100;200;300) according to claim 7, characterised in that the second surface (121;221;321), as seen in said vertical cross-section, continues past the said step, away from the first part (110;210;310) when the body support (100;200;300) is in said use orientation, providing a third surface (122;222;322) in the form of a slanting supporting surface arranged to support a back side of the device (E) resting on the said step.
Body support (100;200;300) according to claim 8, characterised in that said third surface (122;222;322) slants at an angle (122a) of between 10° and 40°, preferably between 25° and 35°, from the vertical.
Body support (100;200;300) according to any one of the preceding claims, characterised in that, when the body support (100;200;300) is in said use orientation with the said device (E) supported by the device support means (123;223;323), the device (E) is located at a horizontal distance of between 0.3 and 0.5 m from the said end edge (111e;211e;311e).
Body support (100;200;300) according to any one of the preceding claims, characterised in that the second part (120;220;320) has a generally triangular vertical cross-section when the body support (100;200;300) is in said use orientation.
Body support (100;200;300) according to any one of the preceding claims, characterised in that, when the body support (100;200;300) is in said use orientation, the said end edge (111e;211e;311e) is arranged at a height from a surface supporting the body support (100;200;300) of between 0.1 and 0.2 m, preferably between 0.12 and 0.16 m.
Body support (100;200;300) according to any one of the preceding claims, characterised in that the first part (110;210;310) comprises a fourth surface (112;212;312), in the form of a slanting upper arm support surface arranged to support the upper arms of the user (P) in said use position at an angle (112a), slanting in a direction opposite to a slanting direction of the first surface (111;211;311), of between 0° and 30° from the vertical.
Body support (100;200;300) according to any one of the preceding claims, characterised in that the device support means (123;223;323) is arranged to support a lower side of the said device (E) from below at a height of between 0.15 and 0.25 m, preferably between 0.18 and 0.22 m from a surface supporting the body support (100;200;300) in said use orientation.