ASTM F939-06

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Designation:F939–06
Standard Practice for
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Selection of Release Torque Values for Alpine Ski Bindings
ThisstandardisissuedunderthefixeddesignationF939;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Adheringtotheseguidelinesmayhelptoreducetheriskofinjuriesresultingfromimproperrelease
torque selection. However, skiing involves inherent risks. Injury can result from simply falling down,
impact with another object, or from many other actions. Many injuries are unrelated to binding
release/retention characteristics. Furthermore, even a properly adjusted binding cannot release under
all injury-producing loads or retain at all times when retention is desired.Therefore, it is to be clearly
understood that compliance with these guidelines in no way guarantees that injury can be prevented.
1. Scope 1.6 These values refer to recommended release torque for
initialadjustmentofaskibindingandsubsequentreadjustment
1.1 This practice provides procedures for the selection of
of the binding during routine maintenance or following a
release torque values for Alpine ski/boot/bindings systems.
suspectedmalfunction.However,thesevaluesarenotintended
Theseproceduresmaybeusedbyskibindingmanufacturersin
to apply to the condition of the equipment at any time after it
their instructions for installation and use and by ski shops for
is put into use.
the adjustment of already mounted ski bindings.
1.6.1 For information concerning applicable tolerances to
1.2 ThispracticeisapplicabletoreleasableAlpineski/boot/
be used for the adjustment and inspection of releasableAlpine
binding systems.
ski bindings in retail operations consult Practice F1063; for
1.3 Release torque values selected using this practice may
rental applications consult Practice F1064.
not be appropriate for circumstances in which:
1.7 This standard does not purport to address all of the
1.3.1 The skier carries an object that significantly increases
safety concerns, if any, associated with its use. It is the
the skier’s effective body weight,
responsibility of the user of this standard to establish appro-
1.3.2 Theskiergraspsorinsomemannercontrolsanobject
priate safety and health practices and determine the applica-
such as a sled, or
bility of regulatory limitations prior to use.
1.3.3 The skier encounters exceptional snow or terrain
conditions not commonly found on developed ski slopes.
2. Referenced Documents
1.4 This practice may be inappropriate for non-mechanical
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2.1 ASTM Standards:
bindings or bindings used with boots that reach more than half
F504 Test Method for Measuring the Quasi-Static Release
way up the lower leg.
Moments of Alpine Ski Bindings
1.5 Release torque values outside the recommendations of
F1061 Specification for Ski Binding Test Devices
this practice may increase the risk of injury to the skier.
F1063 Practice for Functional Inspections andAdjustments
However, skiers who are informed of this potential risk may
of Alpine Ski/Binding/Boot Systems
request such settings and have them provided, subject to any
F1064 Practice for Sampling and Inspection of Complete
guidelines and limitations specified by the binding manufac-
and Incomplete Alpine Ski/Binding/Boot Systems in
turer.
Rental Applications
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This practice is under the jurisdiction of ASTM Committee F27 on Snow
Skiing and is the direct responsibility of Subcommittee F27.10 on Binding Test
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Procedures. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2006. Published August 2006. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1985. Last previous edition approved in 2005 as F939–05a. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/F0939-06. the ASTM website.
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F939–06
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2.2 ISO Standard: 5. Procedures
8061 Method for the Selection of Release Torque Values
5.1 Arange of twist release torque values (M ) based on the
z
mass of the skier is calculated from the equations given in
3. Terminology
5.1.1-5.1.3.
5.1.1 Upper Limit for Twist, M —in N-m is determined by
3.1 Definitions:
z
the following equations:
3.1.1 release/retention settings—release torque of the ski/
5.1.1.1 If the mass of the skier is less than 70 kg:
boot/binding system in twist (M ) and forward lean (M)as
z y
defined in Test Method F504.
M 50.84 m 14 (1)
z s
3.1.2 skier type—classification selected by the skier for the
5.1.1.2 If
...