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▼B
4. SPECIFICATIONS
4.1. Definitions (see ►M4 Annex II ◄)
▼M2
4.1.1. H is a reference poi nt as defined in Item 1.1 of Annex III to Directive 77/649/EEC which must be determined in accordance with the procedure set out in that Directive.
4.1.1.1. Point H′ is the reference point corresponding to H as defined in Item
4.1.1 and shall be determined for all normal positions in which the
seat is used.
4.1.1.2. Point R is the seat reference point defined in Item 1.2 of Annex III to
Directive 77/649/EEC.
4.1.2. The reference line is a straight line as def ined in Item 3.4 of Annex
III to Directive 77/649/EEC.
▼B
4.1.3. Points L1 and L2 are the lower effective belt anchorages.
▼M2
4.1.4. Point C is the point situated 450 mm vertically above point R.
However, if the distance S defined in Item 4.1.6 is not less than 280 mm and if the alternative formula BR = 280 mm + 0·8 S specified in Item 4.4.4.3 is chosen by the manufacturer, t he vertical distance between C and R shall be 500 mm.
▼B
4.1.5. The angles α1 and α2 are respectively the angl es between a horizontal plane and planes perpendicular to the median longitudinal plane of the vehicle and passing through ►M2 point H′◄ and points L1 and L2.
4.1.6. S is the distance in millimetres of the effective upper belt anchorage from a reference plane P parallel to the longitudi nal median plane of the vehicle defined as follows:
4.1.6.1. if the seating position is well defined by the shape of the seat, the plane P shall be the medi an plane of this seat;
4.1.6.2. in the absence of a well-defined position:
▼M2
4.1.6.2.1. the plane P for the driver's seat is a vertical plane parallel to the median longitudinal plane of the vehicle which passes through the centre of the steering-wheel in the plane of the steering-wheel rim when the steering-wheel, if adjust able, is in its central position;
▼B
4.1.6.2.2. the plane P for the front outboard passenger shall be symmetrical with that of the driver;
4.1.6.2.3. plane P for the rear outboard seating position shall be that specified by the manufacturer on condition t hat the following limits for distance A between the longitudinal median plane of the vehicle and plane P are respected:
A ≥ 200 mm ifthe bench seat has been des igned to accomodate two passengers
only,
▼M2
A ≥ 300 mm, ifthe bench seat has been designed to accommodate more than two
passengers.
▼B
4.2. General specifications 一般技术要求
4.2.1. Anchorages for a safety belt shall be so designed, made and situated as to:
4.2.1.1. enable the installati on of a suitable safety belt. The belt anchorages of the