NEN-EN 14764 pdf free download
NEN-EN 14764 pdf free download. Bicycles for use on public roads – Safety requirements and test methods.
4 Requirements and test methods 4.1 Strength tests In all static, impact and fatigue tests, all components shall be in the fully-finished condition. In the case of components or assemblies which can be manufactured in different sizes, all the tests shall be per- formed on the most critical size. In general, for static, impact and fatigue tests, each type of test shall be conducted on a new test sample, but if only one test sample is available, it is permissible to conduct all of the tests on the same sample with the sequence of testing being fatigue, static, and impact. When more than one type of test is conducted on the same sample, the test sequence shall be clearly recorded in the test report or record of testing. NOTE It should be noted that if more than one test is conducted on the same sample earlier tests can influence the results of subsequent tests. In reports on fatigue tests, the test frequency shall be recorded. 4.2 Sharp edges Exposed edges that could come into contact with the rider’s hands, legs, etc., during normal riding or normal han- dling and normal maintenance shall not be sharp. 4.3 Security and strength of safety-related fasteners 4.3.1 Security of screws Any screws used in the assembly of suspension systems or screws used to attach generators, brake-mechanisms and mud-guards to the frame or fork or handlebar, and the saddle to the seat- pillar shall be provided with suitable locking devices, e. g., lock-washers, lock-nuts, or stiff nuts. 4.3.2 Minimum failure torque The minimum failure torque of bolted joints for the fastening of handle bars, handlebar-stems, bar-ends, seats and seat-pillars shall be at least 50 % greater than the manufacturer’s recommended tightening torque. 4.4 Crack detection methods Standardised methods should be used to emphasise the presence of cracks where visible cracks are specified as criteria of failure in tests specified in this Standard. NOTE For example, suitable dye-penetrant methods are specified in ISO 3452. 4.6.2 Hand-operated brakes 4.6.2.1 Brake-lever position The hand-brake levers for front and rear brakes shall be positioned according to the legislation or custom and prac- tice of the country in which the bicycle is to be sold, and the bicycle manufacturer shall state in the users instruction manual which levers operate the front and rear brakes (see also 5). 4.6.2.2 Bake-lever grip dimensions and position for applied force 4.6.2.2.1 Requirement The maximum grip dimension, d , measured between the outer surfaces of the brake-lever in the region intended for contact with the rider’s fingers and the handlebar or the handlebar-grip or any other covering where present, shall not exceed 90 mm over a distance of not less than 40 mm as shown in Figure 4. For dimension a see 4.6.2.2.2. NOTE The range of adjustment on the brake-lever should permit these dimensions to be obtained. 4.6.2.2.2 Test method Fit the gauge illustrated in Figure 5 over the handlebar or handlebar-grip and the brake-lever as shown in Figure 6 so that the face A is in contact with the handlebar or grip and the side of the brake-lever. Ensure that the face B spans an area of that part of the bake-lever which is intended for contact with the rider’s fingers without the gauge causing any movement of the brake-lever towards the handlebar or grip. Measure the distance a , the distance be- tween the last part of the lever intended for contact with the rider’s fingers and the end of the lever (see 4.6.2.2.1, Figures 4 and 5, and 4.6.2.2.3).NEN-EN 14764 pdf download.
