Document ID: chunk:federal_register_of_legislation:F2024C00147:body:0:p14
Version: federal_register_of_legislation:F2024C00147
Segment Type: other
Provision Reference: 
Character Range: 40387–43167

hammer formed by a rigid sphere with a diameter of 165 ± 1 mm having a 5 mm thick rubber covering of Shore A hardness 50.

       A device is provided which permits determination of the maximum angle assumed by the arm in the plane of release.

       A support firmly fixed to the structure of the pendulum serves to hold the specimens in compliance with the impact requirements specified in paragraph 6.1.3.2.2.6. below.

       Figure 1 below gives the dimensions (in mm) of the test rig and the special design specifications:

Figure 1

        6.1.3.2.1.2. The centre of percussion of the pendulum coincides with the centre of the sphere, which forms the hammer. It is at a distance l from the axis of oscillation in the release plane, which is equal to 1 m ± 5 mm. The reduced mass of the pendulum is mo = 6.8 ± 0.05 kilograms. The relationship of mo to the total mass m of the pendulum and to the distance d between the centre of gravity of the pendulum and its axis of rotation is expressed in the equation:

        6.1.3.2.2. Description of the test

        6.1.3.2.2.1. The procedure used to clamp the mirror to the support shall be that recommended by the manufacturer of the device or, where appropriate, by the vehicle manufacturer.

        6.1.3.2.2.2. Positioning of the mirror for the test:

        6.1.3.2.2.2.1. Mirrors shall be positioned on the pendulum impact rig in such a way that the axes which are horizontal and vertical when the mirror is installed on a vehicle in accordance with the applicant's mounting instructions are in a similar position;

        6.1.3.2.2.2.2. When a mirror is adjustable with respect to the base, the test position shall be that in which any pivoting device is least likely to operate, within the limits of adjustment provided by the applicant;

        6.1.3.2.2.2.3. When the mirror has a device for adjusting its distance from the base, the device shall be set in the position in which the distance between the housing and the base is shortest;

        6.1.3.2.2.2.4. When the reflecting surface is mobile in the housing, it shall be so adjusted that the upper corner, which is furthest from the vehicle, is in the position of greatest projection relative to the housing.

        6.1.3.2.2.3. Except in the case of test 2 for interior mirrors (see paragraph 6.1.3.2.2.6.1. below), when the pendulum is in a vertical position the horizontal and longitudinal vertical planes passing through the centre of the hammer shall pass through the centre of the reflecting surface as defined in paragraph 2.1.1.11. of this Regulation The longitudinal direction of oscillation of the pendulum shall be parallel to the longitudinal median plane of the vehicle.

        6.1.3.2.2.4. When, under the conditions governing adjustment