ASTM F2680-2009(2014) Standard Specification for Manually Operated Front Wheel Retention Systems for Bicycles《自行车人工操作前轮保持系统的标准规范》.pdf
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1、Designation: F2680 09 (Reapproved 2014) An American National StandardStandard Specification forManually Operated Front Wheel Retention Systems forBicycles1This standard is issued under the fixed designation F2680; the number immediately following the designation indicates the year oforiginal adoptio
2、n or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the standard for front wheelretention systems for
3、 all bicycles equipped with manuallyoperated retention systems such as a quick release.1.2 This specification is only for bicycles equipped withmanually operated retention systems, and does not apply totool-operated wheel fastening systems.1.3 The intent of this specification is to define the perfor
4、-mance of primary and secondary wheel retention systems, withthe focus on preventing unintended wheel separation.1.4 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety
5、concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 adult b
6、icycle, nbicycle designed for, and marketedto, adult riders.2.1.2 bicycle fork (fork), nmechanism between the headtube and front hub axle, including some or all of the followingcomponents; the steerer tube, crown, fork blades, triple clamps,shock absorbers, lower tubes, upper tubes and dropouts (for
7、kends).2.1.3 direction of removal of the wheel from the fork,ndirection, when both primary and secondary wheel reten-tion systems are disengaged, that provides the least resistanceto wheel and fork separation or wheel removal.2.1.4 dropout (fork end), nfork component used tosupport, or mount, the fr
8、ont wheel at the axle.2.1.5 manually operated, adjwithout the use of tools.2.1.6 primary retention, nsystem that keeps the bicyclewheel connected to the bicycle fork for riding.2.1.7 primary retention system in the unlocked position,nposition where, (1) if a quick release cam is used, the camis open
9、ed as far as possible or (2) if a turning style system suchas a wing nut or another non-cam style system is used, themanual lever is loosened 360.2.1.8 quick release mechanism, nlever-actuated cammechanism that connects and retains the bicycle front wheel tothe bicycle fork.2.1.9 secondary retention
10、, nsystem that retains the bicyclewheel in the dropouts when the primary retention system is inthe open (unlocked) position.2.1.10 wheel hub, nassembly consisting of an axle con-nected by bearings to a hub shell, to which the spokes attach,and permitting the shell to revolve around the axle.3. Perfo
11、rmance Requirements3.1 Bicycles equipped with manually operated primaryretention systems shall be equipped with secondary retentionsystems.3.2 The primary retention system shall prevent relativemotion between the front wheel axle and the front fork whentested as shown in Fig. 1 by the methods descri
12、bed in 4.1.1.3.3 The secondary retention system shall prevent frontwheel removal or partial separation when tested by themethods described in 4.1.2. An example of one type of frontwheel partial separation is shown in Fig. 2.3.4 Manually operated wheel retention systems shall not beused on bicycles w
13、ith 20-in. (51-cm) diameter wheels orsmaller (excluding adult bicycles).4. Test Methods4.1 Test SetupAssemble and adjust the primary and sec-ondary retention systems according to the manufacturers in-structions. Remove the braking system entirely or set to thestate for wheel removal. With no tire on
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