结论：同一个词在标准里和在日常里可能不是一回事

轮椅的参数看起来直观——座宽、座深、载重、续航，但标准中对这些术语有精确的定义，而定义可能与日常理解不同。

理解偏差的后果是实际的：

数据不可比。 两家企业按不同理解标注同一参数，数值看起来差别很大，实际可能相当。

测试做错。 按错误的理解测量，数据不符合标准要求。

采购误判。 采购方按日常理解解读参数，与实际不符。

说明书出错。 标注的参数与标准定义的含义不一致。

容易混淆的尺寸术语

术语 常见的误解 标准中的含义
座宽 座面外沿宽度 通常指有效的座面宽度或两扶手内侧距离
座深 座面前后总长 通常指靠背到座面前缘的有效深度
座高 座面到地面 测量点和状态有规定（是否含坐垫）
靠背高 靠背总高 从座面起算的有效高度
总宽 车架宽度 通常指最宽处含轮子
总长 车架长度 通常含脚踏在使用位置
折叠尺寸 各家标注不一 需说明拆卸状态

「是否含坐垫」在座高上是常见的分歧点，含坐垫和不含坐垫的座高差别可能有几厘米，而这个差别对转移和适配有实际影响。

载重相关的术语

最大使用者体重。 指使用者本人的体重。

最大载重。 可能包含使用者加随身物品。

额定载荷。 试验中使用的载荷，可能与上述不同。

试验载荷。 试验中实际施加的载荷，通常是额定载荷乘以某个系数。

这几个术语的混用是实际存在的问题，标注「载重 100 公斤」时，究竟指使用者体重还是含物品，不说明的话使用者无法判断。

性能相关的术语

续航里程。 测试条件（载重、路面、速度、温度）不同，数值差别很大。

最大速度。 空载还是额定载荷下、平地还是特定条件。

爬坡能力。 角度还是百分比、连续还是瞬时、多大载荷。

越障高度。 正面通过还是需要技巧、什么形式的障碍。

制动距离。 速度、载重、坡度、路面条件。

「爬坡能力用角度还是百分比」是容易混淆的，同一个坡度，角度值和百分比值的数字完全不同，不注明单位容易误读。

结构相关的术语

后轮与驱动轮。 手动轮椅的后轮通常是驱动轮，但电动轮椅可能是前驱或中驱。

脚踏与腿托。 支撑脚部和支撑小腿的部件。

扶手与侧板。 不同产品的称呼不同。

靠背角度。 相对什么基准测量。

座面角度。 座面相对水平面的倾角，正负方向要明确。

「座面角度的正负」要说明，因为前倾和后倾对使用者的意义完全不同。

差异的影响

在测试中。 按错误的理解设定测量点或条件，数据不符合标准。

在比较中。 不同产品的参数按不同定义标注，比较失去意义。

在采购中。 招标参数的定义不清，投标方各自理解。

在使用中。 使用者按日常理解选择，实际不合适。

在资料中。 说明书的参数与报告的参数定义不一致。

核对的方法

查标准的术语定义部分。 多数标准有专门的术语章节。

看测量方法的规定。 定义之外，测量方法也说明了含义。

看图示。 标准中的图示通常直观说明测量点。

核对报告中的定义。 报告应当说明参数的测量方法。

内部统一。 企业内部对术语的理解要统一。

「看图示」是快速理解术语的有效方法，因为尺寸类术语的图示直接标出了测量的起止点。

资料中的处理

明确定义。 给出参数时说明测量方法或引用标准的定义。

注明条件。 性能参数注明测试条件。

注明单位。 特别是角度与百分比。

注明状态。 比如座高是否含坐垫。

保持一致。 说明书、标识、宣传材料、报告之间一致。

「给出参数时说明测量方法」看起来啰嗦，但它消除了歧义，对使用者和采购方都有帮助。

招标与采购中的术语问题

术语理解的差异在招标采购中会直接造成争议：

招标参数定义不清。 各投标方按自己的理解响应。

评标时无法比较。 同一参数不同定义的数值放在一起。

验收时产生分歧。 实测值与投标值的差异可能源于定义。

合同履行的争议。 参数不符究竟是产品问题还是理解问题。

建议招标文件中对关键参数给出明确定义或引用标准条款，这一步花的时间不多但能避免后续的争议。

内部统一的做法

企业内部对术语的理解也需要统一：

建立术语表。 关键参数的定义与测量方法。

与标准对齐。 内部定义应当与适用标准一致。

培训。 设计、生产、销售、售后的理解一致。

文件统一。 各类文件中的参数定义一致。

「销售人员的理解」尤其需要统一，因为他们直接面对客户，理解偏差会直接传递给客户。

常见的准备不足

信息不全。 材料、工艺、使用环境的信息缺失，导致方案设计缺乏依据。

样品不具代表性。 试制样品或挑选样品，与量产状态有差距。

条件未明确。 测试条件没说清楚，数据的适用范围就不明确。

只看初始值。 忽略了环境和时间作用后的性能变化。

项目不完整。 遗漏了必要的项目，提交时才发现。

这五项在实际委托中出现频率较高，建议在项目启动时逐项确认，因为它们造成的返工成本远高于事前确认所花的时间。

我们的做法

出具报告时，我们会说明各参数的测量方法或依据的标准条款，因为同一个参数名称在不同理解下可能指不同的量。

对于委托方提供的参数与我们的测量结果不一致的情形，我们会先核对是否是定义理解的差异，而不是直接判定为不合格 ——很多情况下只是测量口径不同。

建议委托方在送检时说明自己对关键参数的定义，如果与标准定义不同，可以提前澄清。

如果你对轮椅参数的定义有疑问，或者需要核对参数的测量口径，可以直接联系：132 4819 8029。检测能力见服务介绍，产品分类见手动轮椅检测与电动轮椅检测，标准信息见标准查询。

English version

Conclusion. Wheelchair parameters look self-evident: seat width, seat depth, load capacity, range. Standards define these terms precisely, however, and the definitions may differ from everyday understanding. Misunderstanding has real consequences. Data become incomparable, when two manufacturers state the same parameter on different understandings and figures that look very different may in fact be equivalent. Testing goes wrong, when measurement follows a mistaken understanding and the data do not meet the standard's requirement. Purchasers misjudge, reading parameters by everyday understanding that does not match reality. And documentation errs, when stated parameters do not mean what the standard's definition means.

Dimensional terms that confuse. Seat width is commonly taken as the outer width of the seat while standards generally mean the effective seat width or the distance between armrest inner faces. Seat depth is commonly taken as the overall fore-aft length while standards generally mean the effective depth from backrest to seat front edge. Seat height is commonly taken as seat surface to floor while the measuring point and condition are specified, including whether the cushion is fitted. Backrest height is commonly taken as overall height while standards measure effective height from the seat surface. Overall width is commonly taken as frame width while standards generally mean the widest point including wheels. Overall length is commonly taken as frame length while standards generally include footplates in the position of use. And folded dimensions are stated inconsistently between manufacturers and need the disassembly state described. Whether the cushion is included is the common disagreement on seat height: the difference can be several centimetres, which matters practically for transfers and fit.

Load-related terms. Maximum user weight refers to the occupant's own weight. Maximum load may include the occupant plus carried items. Rated load is the load used in testing and may differ from both. And test load is what is actually applied in testing, generally the rated load multiplied by a factor. Confusion between these is a real problem: stating a load capacity of one hundred kilograms leaves the user unable to judge whether it means occupant weight or includes belongings.

Performance terms. Range varies greatly with test conditions of load, surface, speed and temperature. Maximum speed depends on whether unladen or at rated load, on the level or under specified conditions. Gradient capability depends on whether expressed as an angle or a percentage, sustained or momentary, and at what load. Obstacle height depends on whether negotiated directly or with technique, and on the form of the obstacle. And braking distance depends on speed, load, gradient and surface. Whether gradient capability is expressed as an angle or a percentage confuses readily: the same slope carries entirely different numbers in each, and omitting the unit invites misreading.

Structural terms. Rear wheel and drive wheel coincide on manual chairs while powered chairs may be front or mid-wheel drive. Footplates and legrests support the feet and the lower legs respectively. Armrests and side panels are named differently between products. Backrest angle requires a stated reference. And seat angle, the inclination of the seat relative to horizontal, requires the sign convention to be clear. The sign of seat angle needs stating, since forward and rearward tilt mean entirely different things to the user.

Consequences of confusion. In testing, a mistaken understanding sets measuring points or conditions wrongly and the data do not conform. In comparison, parameters stated on different definitions make comparison meaningless. In procurement, unclear tender parameter definitions leave bidders interpreting for themselves. In use, users choose on everyday understanding and find the product unsuitable. And in documentation, instruction parameters and report parameters follow different definitions.

How to check. Consult the standard's terms and definitions section, which most standards have. Read the measurement method, which conveys meaning beyond the definition. Look at the illustrations, which generally show measuring points clearly. Check the definitions in the report, which should state how parameters were measured. And unify understanding internally within the company. Looking at illustrations is the quickest way to understand dimensional terms, since they mark the start and end points of the measurement directly.

Handling it in documentation. Define parameters explicitly by stating the measurement method or citing the standard's definition. State conditions for performance parameters. State units, angles and percentages especially. State the condition, such as whether seat height includes the cushion. And keep it consistent across instructions, marking, marketing material and reports. Stating the measurement method alongside a parameter looks verbose while removing ambiguity, which helps both users and purchasers.

How we handle it. In reports we state the measurement method or the standard clause relied upon for each parameter, since one parameter name can denote different quantities under different understandings. Where a client's stated parameter differs from our measurement we first check whether the difference is one of definition rather than judging nonconformity, since it is often merely a difference in measurement convention. We suggest that clients state their own definitions of key parameters when submitting, so that any divergence from the standard definition can be clarified in advance.

If you have questions about wheelchair parameter definitions or need to reconcile measurement conventions, get in touch: +86 132 4819 8029.