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4.4.4.3. The effective upper belt anc horage must lie behind a plane FK running perpendicular to the longi tudinal median pl ane ofthe seat and intersecting the reference line at a point B at an angle of 120º such that BR = 260 mm + S. Where S ≥ 280 mm, the manufacturer may use BR = 260 mm + 0·8 S at his discretion.
▼B
4.4.4.4. The value ofS s hall not be less than 140 mm.
4.4.4.5. The effective upper bel t anchorage shall be situated to the rear of a vertical plane perpendicular to the median longitudinal plane ofthe vehicle and passing through the ►M2 R ◄ point as shown in Annex III.
▼M2
4.4.4.6. The effective upper belt anchorage must be situated
above a horizontal plane passing through t he point C defined in Item 4.1.4.
4.4.4.7. In addition to t he upper anchorage specified in Item 4.3.1, other
effective upper anchorages may be provided if one of the follo wing conditions is satisfied:
4.4.4.7.1. The additional anchorages comply with the requirements laid down in Items 4.4.4.1 to 4.4.4.6.
4.4.4.7.2. The additional anchorages can be used without the aid of tools,
comply with the requirements laid down in Items 4.4.4.5 and 4.4.4.6 and are located in one ofthe areas determined by shifting the area described in Annex III, Figure 1, 80 mm upwards or downwards in a vertical direction.
4.4.4.7.3. The anchorage(s) is/are intended for a harness belt, complies/comply with the requirements laid down in Item 4.4.4.6, lie(s) behind the transverse plane passing through the re ference line and is/are located:
4.4.4.7.3.1. in the case of a single anchorage, inside the area common to two dihedra defined by the verticals passing through points J1 and J2 asdefined in Item 4.4.4. 1 and whose horizontal sections are defined by Figure 2 in Annex III; 4.4.4.7.3.2. in the case of two anchorages, inside wh ichever of the above defined dihedra is suitable, provided that each anchorage is not more than 50 mm distant from the symetrically located, mirror-image position of the other anchorage about plane P, defined in Item 4.1.6, of the seat under consideration.
▼B
4.5. Dimensions of threaded belt anchorage holes
4.5.1. A belt anchorage shall have a thr eaded hole of11·11 mm (7/16) 20 UNF 2B.
▼M2
4.5.2. If the vehicle is fitted by the manufacturer with safe ty belts which are attached to all anchorages prescribed for the seat in question, these anchorages need not meet the require ment stipulated in Item 4.5.1, provided that they comply with the other pr ovisions of this Directive. Nor does the requirement set out in Item 4.5.1 apply to additional anchorages which meet the condition specified in Item 4.4.4.7.3.