ASTM F939-99
(Practice)Standard Practice for Selection of Release Torque Values for Alpine Ski Bindings
Standard Practice for Selection of Release Torque Values for Alpine Ski Bindings
SCOPE
1.1 This practice provides information for the selection of release torque values for Alpine ski bindings. It gives information necessary for determining release torque values for an individual to be used by ski binding manufacturers in their instructions for installation and use and by ski shops for the adjustment of already mounted ski bindings.
1.2 This practice is applicable to releasable Alpine ski-boot-binding systems.
1.3 Release torque values selected using this practice may not be appropriate for circumstances in which:
1.3.1 The skier carries an object that significantly increases the skier's effective body weight,
1.3.2 The skier grasps or in some manner controls an object such as a sled, and
1.3.3 The skier encounters exceptional snow or terrain conditions not commonly found within ski area boundaries.
1.4 This practice may be inappropriate for nonmechanical bindings or bindings used with boots that reach more than half way up the lower leg.
1.5 Release torque values outside the recommendations of this practice may increase the risk of injury to the skier. However, skiers who are informed of this potential risk may request such settings and have them provided, subject to any guidelines and limitations specified by the binding manufacturer.
1.6 These values refer to recommended release torque for initial adjustment of a ski binding and subsequent readjustment of the binding during routine maintenance or following a suspected malfunction but are not intended to apply to the condition of the equipment at any time after it is put into use.
1.6.1 For information concerning applicable tolerances to be used for the adjustment and inspection of releasable Alpine ski bindings in retail operations consult Practice F1063; for rental applications consult Practices F1064 and F1065.
1.7 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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Designation: F 939 – 99
Standard Practice for
Selection of Release Torque Values for Alpine Ski Bindings
This standard is issued under the fixed designation F 939; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The intent of this practice is to provide guidelines for the selection of release torque values for
Alpine ski/boot/binding systems. Adhering to these guidelines may help to reduce the risk of injuries
resulting from improper release torque selection. However, skiing involves inherent and other risks.
Injury can result from simply falling down, impact with another object, or from many other actions.
Many injuries are unrelated to binding release characteristics. Furthermore, even a properly adjusted
binding cannot release under all injury-producing loads. Therefore, it is to be clearly understood that
compliance with these guidelines in no way guarantees that injury can be prevented.
1. Scope condition of the equipment at any time after it is put into use.
1.6.1 For information concerning applicable tolerances to
1.1 This practice provides information for the selection of
be used for the adjustment and inspection of releasable Alpine
release torque values for Alpine ski bindings. It gives informa-
ski bindings in retail operations consult Practice F 1063; for
tion necessary for determining release torque values for an
rental applications consult Practices F 1064 and F 1065.
individual to be used by ski binding manufacturers in their
1.7 This standard does not purport to address all of the
instructions for installation and use and by ski shops for the
safety concerns, if any, associated with its use. It is the
adjustment of already mounted ski bindings.
responsibility of the user of this standard to establish appro-
1.2 This practice is applicable to releasable Alpine ski-boot-
priate safety and health practices and determine the applica-
binding systems.
bility of regulatory limitations prior to use.
1.3 Release torque values selected using this practice may
not be appropriate for circumstances in which:
2. Referenced Documents
1.3.1 The skier carries an object that significantly increases
2.1 ASTM Standards:
the skier’s effective body weight,
F 504 Test Method for Measuring the Quasi-Static Release
1.3.2 The skier grasps or in some manner controls an object
Moments of Alpine Ski Bindings
such as a sled, and
F 1063 Practice for Functional Inspections and Adjustments
1.3.3 The skier encounters exceptional snow or terrain
of Alpine Ski/Boot/Binding Systems
conditions not commonly found within ski area boundaries.
F 1064 Practice for Sampling and Inspection of Complete
1.4 This practice may be inappropriate for nonmechanical
Alpine Ski/Boot/Binding Systems in Rental Applications
bindings or bindings used with boots that reach more than half
F 1065 Practice for the Inspection of Incomplete Alpine
way up the lower leg.
Ski/Boot/Binding Systems in Rental Applications
1.5 Release torque values outside the recommendations of
2.2 ISO Standard:
this practice may increase the risk of injury to the skier.
8061 Method for the Selection of Release Torque Values
However, skiers who are informed of this potential risk may
request such settings and have them provided, subject to any
3. Terminology
guidelines and limitations specified by the binding manufac-
3.1 Definitions:
turer.
3.1.1 The moments M and M are defined in Method F 504.
1 3
1.6 These values refer to recommended release torque for
3.1.2 The designations I, II, and III refer to the type of
initial adjustment of a ski binding and subsequent readjustment
skiing undertaken by the skier and can be defined as follows:
of the binding during routine maintenance or following a
3.1.2.1 I—Skiers who designate themselves as Type I re-
suspected malfunction but are not intended to apply to the
ceive lower than average release/retention settings. This cor-
responds to an increased risk of inadvertent binding release in
This practice is under the jurisdiction of ASTM Committee F-27 on Snow
Skiing and is the direct responsibility of Subcommittee F27.10 on Binding Test
Procedures. Annual Book of ASTM Standards, Vol 15.07.
Current edition approved Dec. 10, 1999. Published February 2000. Originally Available from American National Standards Institute, 11 W. 42nd St., 13th
published as F 939 – 85. Last previous edition F 939 – 93. Floor, New York, NY 10036.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
F 939
order to gain releasability in a fall. This type also applies to where m is the mass of the skier in kilograms.
s
entry level skiers uncertain of their classification.
5.1.2 Lower Value for Twist, M , in newton-metres is
3.1.2.2 II—skiers not classified as in Type I or III.
determined by the following equations:
3.1.2.3 III—Skiers who designate themselves as Type III
5.1.2.1 If the mass of the skier is less than 75 kg:
receive higher than average release/retention settings. This
M 5 0.71 m (4)
1 s
corresponds to decreased releasability in a fall in order to gain
a decreased risk of inadvertent binding release.
5.1.2.2 If the mass of the skier is greater than or equal to 75
3.1.2.4 Skiers who desire release/retention setting lower
kg:
than Type I may designate themselves (I−)
M 5 0.59 m 1 9 (5)
1 s
3.1.2.5 Skiers who desire release/retention settings higher
than Type III may designate themselves (III+) where m is the mass of the skier in kil
...
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