BS/EN 1022-2018 pdf download.Furniture-Seating – Determination of stability.
6.1.2 Back loading point “B”
The point on the centre line of the back rest, 300 mm above loading point “A’ (6.1.1) measured when the seat is loaded with 640 N through the seat loading pad (5.11).
6.2 All other seating
6.2.1 General
The seat and back loading points shall be determined using the template as specified in 5.2 in the manner specified in 6.2.2 or 6.2.3.
In some cases it may not be possible to determine the loading points by means of the template.
In such cases the seat loading point (A) shall be 175 mm forward of the seat/back junction, or at the point closest to this that allows the seat load to be applied. The back loading point (B) shall be a point 300 mm upward from the seat/back junction.
Where the geometry of the back rest does not allow the back force to be applied at the point defined by the above method the force shall be applied at the nearest point (up or down the back) and the bending moment (back force, N x floor to back loading point distance, m) shall remain constant.
lithe number of seats in the Item Is not obvious, divide the total seat length (In mm) by 600 mm and round to the nearest whole number to determine the number of seats. Divide the total seat length into seats of equal length.
6.2.2 Seating with a back rest
For seating with adjustable back rests, set the back rest to its most upright position. Adjust the template such that the angle between the seat and back portions is 90°.
For upholstered and flexible seating position the loaded template (5.2) on the centre line of the seat as far towards the rear as possible, without applying force to the back rest. Adjust the position of the template by pushing the back loading portion into the back of the seating so that it is in contact with the back rest, allowing the shape of the seat portion of the template to correlate with that of the seat (see Figure lOa)).
For rigid seating position the unloaded template (5.2) on the centre line of the seat as far towards the rear as possible without applying force to the back rest. Adjust the position of the template by pushing the back loading portion into the back so that it is in contact with the back rest and apply the specified load to the template. Where possible ensure that point A on the template is in contact with the seating surface (see Figure lOb)). Where this is not possible ensure the top of the horizontal part of the seat loading template is as close to horizontal as possible. In cases where the template can be settled in more than one position, the position having the smallest angle between the seat and back portions of the template shall be used. The angle shall in no cases be less than 90°.
Mark the required seat loading point (A), and back loading point (B) from the template. If relevant repeat the procedures on the other seat(s).
Where the geometry of the back rest does not allow the back force to be applied at the point defined by the above method the force shall be applied at the nearest point (up or down the back) and the bending moment (back force, N x floor to back loading point distance, m) shall remain constant.
6.2.3 Seating without a back rest
Set up the template (5.2) at 90° as shown in Figure 4. Place it on each seating position as shown in Figure lOc). Mark the seat loading point (A) with the aid of the mark C from the template.BS/EN 1022-2018 pdf download.
BS/EN 1022-2018 pdf download
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