<?xml:namespace prefix="st1" ns="urn:schemas-microsoft-com:office:smarttags">4.10.1 A device that transmits force, usually measured in lbs. (N), to the test caster/wheel from a free-falling weight (Refer to Figure 61 for orientation).<?xml:namespace prefix="o" ns="urn:schemas-microsoft-com:office:office"></?xml:namespace></?xml:namespace>
使用一个能够传送力量的装置(通常使用lbs为计量单位)，以自由落体的重量，来测试轮子对冲击的承受力。
4.10.2 The apparatus can be any design that will allow a guided free-falling weight to drop on
the supported caster/wheel.
这个设备可以任意设计，成为能够使一个受控制的自由落体力量掉落在被支撑的小脚轮上的设备。
4.10.3 A measuring device to determine free fall distance is to be mounted parallel to the free
fall weight path (Refer to Figure 61 for orientation).
必须装置一个测量装置可以决定自由落体的距离，以平行的方式装置於自由落体的路径上。
4.10.4 The mounting fixture must be rigid enough to prevent deflection during the impact test.
这个测试的托架配件必须要非常坚固，使其可以承受冲击测试中可能产生的弯曲变形。
5 FURNITURE CHAIR CASTERS – TEST PROCEDURE AND ACCEPTANCE CRITERIA 家具椅子之小脚轮－测试过程及标准接受度
This section applies to casters that will normally be used in home/office environments for
chair applications only. It covers categories, dimensions, and testing procedures.
以下是关於运用於家中或是办公室内的椅子所装置的轮子。内容包含种类、尺寸及测试过程。
5.1 Categories 种类
Office furniture casters are classified into 5 categories based on wheel diameter:
办公室用家具使用轮子基於直径可分为以下五种，
1. Single wheel 2" (50 mm)
2. Single wheel 2 ½" (65 mm)
3. Single wheel 3" (75 mm)
4. Dual wheel 2" (50 mm)
5. Dual wheel 2 ½" (65 mm)
5.2 Dimensions 尺寸
Minimum dimensions for office furniture casters are as follows:
办公室使用小脚轮最小尺寸如下:
Wheel Diameter Dimension轮子直径尺寸
Min. Wheel (Single wheel) 2" (50 mm) diameter
Max. Wheel (Single wheel) 3" (75 mm) diameter
Min. Wheel (Dual wheel) 2" (50 mm) diameter
Max. Wheel (Dual wheel) 2 ½" (65 mm) diameter
5.3 Testing – General Requirements 测试之普遍的需要
The manufacturer shall be free to choose the design, raw materials, surface treatments,
embellishments, and methods of manufacture used so long as the requirements of this
standard are complied with.
制造商能够自行决定设计方式、材质选定、表面处理方式、及装饰方法。制造的方法皆须遵从这个标准法则。
5.3.1 All tests must be conducted with the same caster.
所有的测试皆须使用同一个轮子。
5.3.2 All tests shall be performed at ambient temperature of 68-72°F(20-22°C).
所以的测试皆须在周遭温度20-22°C下进行。
5.3.3 No caster or part of a caster shall become detached during the test. Each caster shall be
capable of carrying out its normal function at the end of the test program.
测试时，所有的零件接不可与轮子本身分离。所有的轮子在测试完成时接要能够维持正常的功能。
5.4 Test Procedures and Acceptance Criteria 测试过程及标准接受度
5.4.1 Must comply with American National Standards Institute (ANSI) and Business &
Institutional Furniture Manufacturers Association (BIFMA) Standards in that "no structural
breakage or loss of serviceability" is allowed. The acceptance criteria per BIFMA 5.1 –
2000 specification state, "Structural breakage or loss of serviceability shall constitute
failure. No failure shall be allowed that in any way would cause personal injury to the
occupant." Dynamic test shall be performed per ANSI/BIFMA X5.1 – 1993 18.3 "Test
Procedures for Durability Cycling". The following test procedures shall be used:
必须遵从ANSI及BIFMA所规范的「不可有任何的结构性破坏，或是丧失其功能性。」BIFMA於2000年时声明：「结构破坏及失去功能性皆会导致失败。任何可能导致人员伤亡的错误皆不允许发生。」力学测试进行时，必须遵照ANSI及BIFMA於1993所声明的:「测试循环耐久度的过程。」下列的测试皆须遵守:
5.4.1.1 Attach the chair base with casters to a cycling device as shown in Figure 62. If
the casters have hard treads (greater than or equal to 90 Shore A), conduct the
test with a smooth, hard surface on the test platform. If casters have soft treads,
mount three obstacles on the test platform in accordance with the layout (Refer
to Figure 62).
连接椅子的基座和小脚轮到旋转装置，如图62。如果小脚轮拥有坚硬的胎面(大於或等於90硬度计)，则将实验测试於一个平滑且坚固的测试平台上。如果小脚轮拥有柔软的胎面，则必须放置三个阻碍物再测试平台上，使其与原本的设计一致。(见图62)
