Detail of GB/T 42784.1-2023

Introduction of GB/T 42784.1-2023

GB/T 42784.1-2023 Rough-terrain trucks - Visibility test methods and their verification - Part 1: Variable-reach trucks 1 Scope This document specifies a static test method for determining and evaluating the operator’s visibility on a rectangular 1 m boundary around the rough-terrain variable-reach truck and on a 12 m radius visibility test circle. Performance requirements for visibility are specified in this document. This document applies to rough-terrain variable-reach trucks (hereinafter referred to as ‘trucks’) that have a specific seated operator’s position on the left-hand side of the boom or centre position (excluding operator position on the right side of the boom). This document does not apply to ——trucks designed to handle freight containers (reach stackers), ——articulated telescopic wheel loaders, ——slewing trucks, or ——lorry mounted trucks. Note: The method used does not capture all of the aspects of the operator’s visibility, but provides information to assist in determining the acceptability of visibility from the truck. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5053-1 Industrial trucks - Vocabulary Part 1: Types of industrial trucks ISO 5353 Earth-moving machinery, and tractors and machinery for agriculture and forestry - Seat index point ISO 12100 Safety of machinery - General principles for design - Risk assessment and risk reduction 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 10896-1, ISO 5053-1 and ISO 12100 and the following apply. 3.1 test surface area of compacted earth or firm surface that forms the ground reference plane for the visibility measurements, with a gradient of (0 ± 2) % 3.2 light source position centre point; LSPCP mid-point of the line between light sources, at 65 mm, 205 mm or 405 mm light source spacing, located 680 mm above and 20 mm in front of the seat index point (SIP) Note 1: The seat index point is defined in ISO 5353, 3.1. Note 2: See Figure 1. 3.3 test truck boundary; TTB smallest rectangular boundary that can be placed around the vertical projection of the truck Note 1: Truck dimensions do not include equipment such as working lights, mirrors, etc. Note 2: See Figure 4. 3.4 visibility test circle; VTC circle with 12 m radius located on the ground reference plane with its centre vertically below the light source position centre point (3.2), which is divided into six sectors of vision Note 1: For the six sectors of vision, see 3.4.3 to 3.4.6. Note 2: See Figure 2. 3.5 rectangular 1 m boundary; RB line on the ground reference plane located at 1 m distance from the outside test truck boundary (3.3) Note: See Figure 3 and Figure 4. 3.6 sector of vision A segment of the visibility test circle (3.4.1) to the front of the truck, defined by a 9,5 m chord length for the 12 m radius that is perpendicular to the longitudinal plane passing through the light source position centre point (3.2) with the chord length bisected by the longitudinal plane Note: See Figure 2. 3.7 sectors of vision B and C segments of the visibility test circle (3.4.1) to the front of the truck outside sector of vision A (3.4.3) and bounded by the transverse plane through the light source position centre point (3.2) Note: See Figure 2. 3.8 sectors of vision D and E segments of the visibility test circle (3.4.1) to the rear defined by an angle of 45° to both the right and left sides of the longitudinal plane passing through the light source position centre point (3.2) Note: See Figure 2. 3.9 sector of vision F segment of the visibility test circle (3.4.1) to the rear between sectors of vision D and E (3.4.5) Note: See Figure 2. 3.10 masking shadow on the 12 m visibility test circle (3.4.1) or on the rectangular 1 m boundary (3.4.2) created because parts of the base truck and/or its equipment block the light rays from the light sources 3.11 light source apparatus test unit with at least two light sources that have adjustable light spacing, 360° rotatable, with its rotation point at the light source position centre point (3.2) to simulate the range of eye positions for an operator Note: See Figure 1. 3.12 light source spacing distance between the vertical centre axis of the considered light sources 3.13 light bar rigid support on which the light sources are fixed and aligned 3.14 visibility performance criteria criteria intended to minimize risk to persons in the vicinity of the truck during truck operation Note: These visibility performance criteria are specified as maximum allowed maskings (3.5) at the 12 m visibility test circle (3.4.1) or at the rectangular 1 m boundary (3.4.2). 3.15 direct visibility visibility by direct line of sight as determined by the light from the light source 3.16 indirect visibility visibility with the aid of mirrors or other visual aids, such as closed circuit TV (CCTV) Note: For more information, see Annex B. 3.17 derivative truck truck modified or fitted with equipment and/or attachments which can affect visibility 3.18 vertical test object object used to evaluate the maskings (3.5) on the rectangular 1 m boundary (3.4.2), considered to be two-dimensional, without depth 4 Test apparatus 4.1 Light source apparatus The light source apparatus is capable of positioning a light bar horizontally with two light sources (halogen light bulbs, laser, LEDs or equivalent). Each light source shall be horizontally movable on the light bar from 32.5 mm up to 202.5 mm on each side of the light source position centre point. It shall be possible to rotate the light bar through 360° around the light source position centre point. The light source position centre point shall be located 680 mm above and 20 mm in front of the seat index point (SIP) as described in ISO 5353. See Figure 1. 4.2 Vertical test object The vertical test object shall be 1.5 m high, 100 mm wide and be maintained substantially perpendicular to the test surface throughout the tests.

Contents of GB/T 42784.1-2023