GB 24429-2009 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 24429-2009 | English | 145 |
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Sports helmets - Safety requirements and testing methods for sports helmets for cyclists and users of skateboards and roller skates
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GB 24429-2009: Sports helmets - Safety requirements and testing methods for sports helmets for cyclists and users of skateboards and roller skates
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB24429-2009
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.220.40
Y 55
Sports helmets - Safety requirements and testing
methods for sports helmets for cyclists and users of
skateboards and roller skates
Issued on. SEPTEMBER 30, 2009
Implemented on. JULY 01, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Specifications... 7
5 Requirements... 8
5.1 Structure... 8
5.2 Performance... 9
6 Test methods... 10
6.1 Laboratory environmental conditions... 10
6.2 Inspection of helmet structure, size, protection range, marking content... 10
6.3 Inspection of helmet mass... 10
6.4 Inspection of helmet vision... 11
6.5 Test of stability of helmet retention system... 13
6.6 Strength test of helmet retention system... 14
6.7 Test of energy absorption of helmet... 16
7 Marking, packaging, transportation, storage... 20
7.1 Marking... 20
7.2 Packaging, transportation, storage... 21
8 Product manual... 21
Foreword
Chapters 5, 6, 7.1, 8 of this standard are mandatory; and the rest are
recommended.
The main technical requirements and test methods of this standard adopt BS
EN1078.1997 and F1447-06.The terms of this standard correspond to the
standard clauses adopted as follows.
- 5.2.2 corresponds to 4.3 of BS EN1078.1997;
- 5.2.3 corresponds to 4.86 of BS EN1078.1997;
- 5.2.4 corresponds to 4.6.5 of BS EN1078.1997;
- 5.2.5 corresponds to 10.2 of F1447-06;
- 6.4 corresponds to 5.7 of BS EN1078.1997;
- 6.5 corresponds to 5.6 of BS EN1078.1997;
- 6.6 corresponds to 5.5 of BS EN1078.1997.
The purpose of this standard is to ensure that the helmet as manufactured in
accordance with this standard can ensure the safety of the user's head as much
as possible. The setting of each test is to ensure the strength of the helmet.
This standard was proposed by the China Light Industry Association.
This standard shall be under the jurisdiction of the National Standardization
Center for Cultural and Sports Products.
Drafting organizations of this standard. National Sporting Goods Quality
Supervision and Inspection Center, Hebei Provincial Product Quality
Supervision and Inspection Institute, Foshan Shunde Speed Skating Helmet
Co., Ltd., Yueqing Kirin Motorcycle Parts Co., Ltd., Zhuhai Tailian Sports
Equipment Co., Ltd.
The main drafters of this standard. Wang Yanling, Zheng Genchao, Tian Xu,
Zhang Ming, Lu Mingchai, Liu Fei, Yu Wenchuan, Li Weisheng, Niu Congmin.
Sports helmets - Safety requirements and testing
methods for sports helmets for cyclists and users of
skateboards and roller skates
1 Scope
This standard specifies the terms and definitions, specifications, requirements,
test methods, signs, packaging, transportation and storage, and product
specifications for sports helmets for cyclists and users of skateboards and roller
skates.
This standard is mainly applicable to helmets for cyclists and users of
skateboards and roller skates.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 10000 Human dimensions of Chinese adults
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Sports helmet (hereinafter referred to as helmet)
A device used to absorb impact energy and reduce accidental injury to the
wearer's head during exercise.
3.2
Shell
The outer structure of the helmet.
3.3
Cushion coat
An adaptive cushion used to absorb impact energy.
3.4
Comfort pad
A cushion that guarantees the comfort of head wearing.
3.5
Retention system
A complete set of devices that securely hold the helmet on the head,
including adjustments, straps, etc. that make the wearer more comfortable.
3.6
Strap
A portion of the retention system, which is a strap that is fastened under the
wearer's lower jaw to secure the helmet.
4 Specifications
The helmet is divided into four sizes according to GB/T 10000 and the size of
the head circumference of the minor. large, medium, small, extra-small, as
shown in Table 2.
5 Requirements
5.1 Structure
The helmet is composed of a shell, a cushion coat, a comfort pad, a retention
system, and the like.
5.1.1 Shell
It shall meet the following requirements.
5.1.2 Cushion coat
It shall meet the following requirements.
5.1.3 Comfort pad
It shall meet the following requirements.
5.1.4 Retention system
All parts of the retention system shall be safely and securely mounted on the
helmet and meet the following requirements.
5.1.5 Protection range
The helmet must cover the area above the ABCDEF line in Figure 3.
5.2 Performance
5.2.1 Helmet mass (including accessories)
The mass of the helmet is. factory’s nominal value ± 30 g.
5.2.2 Helmet vision
The left and right horizontal fields of view are not less than 105°; the upper field
of view is not less than 25°; the lower field of view is not less than 45°.
6 Test methods
6.1 Laboratory environmental conditions
The temperature is 20 °C ± 3 °C; the relative humidity is 25% ~ 75%.
6.2 Inspection of helmet structure, size, protection range,
marking content
6.3 Inspection of helmet mass
6.3.1 Inspection tools
Weighing instruments which have a division value of not more than 5 g.
6.3.2 Inspection steps
6.4 Inspection of helmet vision
6.4.1 Inspection device
It consists of angle ruler, head model, head model fixing frame. The divisional
value is 1°; the range can meet the requirements of 5.2.2.
6.6 Strength test of helmet retention system
6.6.1 Test device
It consists of fixed frame, test head model, impact weight (quality 4.0 kg ± 0.2
kg), scale, loading device (total mass 5.0 kg ± 0.5 kg), simulated jaw device
(width 87 mm ~ 90 mm), etc., as shown in Figure 7.
6.6.2 Test procedure
a) Properly wear the helmet on the appropriate test head model according to
6.2.2c). Tie the strap through the simulated jaw and fasten it, so that the
loading device (total mass 5.0 kg ± 0.5 kg) is freely acting onto the wearing
device for 30 s. Then determine the starting zero of the scale;
b) After the stabilization, release the impact weight so that it falls freely from
the height of 600 mm ± 5 mm and hits the end stop;
c) Use the scale to measure the dynamic maximum displacement of the
simulated jaw device and the residual displacement at 2 min, which is the
corresponding elongation of the retention system;
6.7 Test of energy absorption of helmet
6.7.1 Test device
The test equipment consists of a collision test bench and an analytical recorder.
It shall comply with the requirements of 5.2.5, 6.7.1.1, 6.7.4.1, 6.7.4.2 to ensure
consistency of impact energy and impact effects.
6.7.4 Test procedure
6.7.4.1 Rigidly fix the acceleration sensor on the center of gravity of the head
model. The angle between the sensor’s sensitive axis and the normal line of
the head’s impact point shall be not more than 5°.
6.7.4.2 Calibrate the impact test device. Adjust the impact speed of the impact
test head so that it collides with the standard test block at 5.44 m/s (measured
at 40 mm before the impact). Under the same conditions, carry out three times
impacts at an interval of 75 s ± 15 s; the peak deviation of each impact
acceleration is not more than 3%. The calibration is performed before and after
the test. If the average acceleration peak after the test differs from the average
acceleration peak before the test by more than 5%, this test result is invalid.
7 Marking, packaging, transportation, storage
7.1 Marking
Each helmet shall have the following permanent (already visible throughout the
service life of the helmet) marking.
7.2 Packaging, transportation, storage
7.2.1 The packaging box of the product shall have the marking contents as
specified in 7.1.
7.2.2 Products shall be transported and stored to prevent collision, moisture,
erosion by organic chemicals.
8 Product manual
Each helmet shall be accompanied by the product Chinese instruction manual,
including at least the following points.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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