ISO 5721-1-2013 pdf free.Agricultural tractors一Requirements, test procedures and acceptance criteria for the operator’s field of vision一 Part 1: Field of vision to the front.
This part of ISO 5721 specifies the requirements, test procedures and acceptance criteria for the field of vision to the front of the operator of agricultural tractors.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5353:1995, Earth-moving machinery, and tractors and machinery for agriculture and forestry — Seat index point
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 field of vision
area which can be viewed from the seated operators eye position
3.1.1 direct field of vision
visibility by direct line of sight as determined by the light from the light source
3.1.2 indirect field of vision
visibility with the aid of mirrors or with other visual aids such as closed circuit television cameras (LU VJ
3.2 semi-circle of vision to the front
semi-circle described by a radius of 12 m about a point situated in the horizontal plane of the road vertically below the reference point, in such a way that, when facing the direction of motion, the arc of the semi-circle lies in front of the tractor, while the diameter bounding the semi-circle is at right angles to the longitudinal axis of the tractor
Note 1 to entry: See Fi2ure 2.
3.3
angle of vision upwards
angle of vision limited downwards by a horizontal plane passing through the eye position and upwards by planes containing the rays of vision from the eye position to points of obscuration caused by vehicle components other than those which cause masking effects (3.4)
4 General provisions for testing
4.1 Measurement accuracy
The equipment and techniques used to make the physical measurements shall be accurate to within ± 2 % of the value measured.
4.2 Eye position
The eye position shall be located 680 mm above and 20 mm in front of the seat index point when determined in accordance with ISO 5353 (see Figurei).
5 Requirements, test procedures and acceptance criteria
5.1 Requirements
5.1.1 General
The tractor shall be constructed and equipped in such a way that, in road traffic and in laini use, li driver has an adequate field of vision, under all the usual conditions pertaining to highway use and to work undertaken in fields. The field of vision is adequate when the driver has at least a partial view of each front tyre or fender when in the straight ahead position and at track width appropriate for the overall width of single tyres not to exceed 2,55 m.
5.1.2 Masking effects
Masking effects shall not exceed 700 mm.
Masking effects due to adjacent structural components over 80 mm in width shall be so configured that there is an interval of not less than 2 200mm – measured as a chord of the semi-circle of vision to the front – between the centres of two masking effects.ISO 5721-1 pdf free download.
Tags: Agricultural tractors
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