ASTM F2126-2006(2010) Standard Test Method for Treestand Static Load Capacity《Treestand静态负荷能力的标准试验方法》.pdf

1、Designation: F2126 06 (Reapproved 2010)An American National StandardStandard Test Method forTreestand Static Load Capacity1This standard is issued under the fixed designation F2126; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, t

2、he 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 test method covers the determination of the staticload capacity of treestands in terms of a factor of

3、safety relativeto the manufacturers rated capacity.1.2 The values stated are in inch-pound units and are to beregarded as the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to est

4、ablish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2F2531 Test Method for Load Capacity of Treestand Seats3. Terminology3.1 The terminology and definitions in the referenced docu-ments are

5、applicable to this test method.3.2 Definitions:3.2.1 backbar or V-baradjustable component of a climb-ing treestand or handclimber that engages the tree to providesupport. The backbar may be rigid or flexible.3.2.2 climbing stickdevice used to assist climbing a treeprimarily to a fixed position trees

6、tand. A structure that issecured to the tree and allows the user to support his weightand climb to the desired height on the tree.3.2.3 climbing treestandtreestand that provides both themeans to ascend the tree, and allow the user to remain at adesired elevation.3.2.4 handclimber, or climbing aiddev

7、ice to assist climb-ing with a climbing treestand. A structure that allows the userto support his weight when lifting a climbing treestand with hislegs.3.2.5 ladder treestandtreestand that is secured to the treeat the elevation where the platform is located. (The laddertreestand may be secured to th

8、e tree at other locations and hassteps that are used to reach the platform or hunting position.)3.2.6 non-climbing, fixed position or hang-on treestandtreestand that is secured to the tree at the elevation where it isused. (The user usually ascends the tree by some means andthen lifts the treestand

9、to the desired position and secures it foruse.)3.2.7 platformhorizontal structural area of a treestand onwhich the user stands and/or places his feet.3.2.8 treestanddevice designed to be affixed to a tree orits branches so as to permit an individual to sit or stand thereonfor the purpose of attainin

10、g an elevated position from which toobserve, photograph or hunt.3.2.9 tripod or tower standtripod or tower stand is con-structed to be self-supporting and is not required to be securedto a tree.4. Summary of Test Method4.1 A climbing treestand is mounted so that its platform isperpendicular or sligh

11、tly above horizontal to a rigid wood ormetal pole when the rated load is applied parallel to themounting pole. A fixed position or ladder treestand shall bemounted with the platform perpendicular to the mounting pole.A tripod stand shall be positioned so that the platform isperpendicular to the appl

12、ication of the load. A climbing stickshall be mounted such that the steps are perpendicular to thepole. The platform is equipped with deflection measurementdevices. The load is applied step-wise and recordings are madeof the load and deflection at each step until yielding orpermanent deflection occu

13、rs or until twice the rated load isapplied. The ladder, tripod and climbing sticks do not requiredeflection measurements be taken.5. Significance and Use5.1 This test method is intended for quality assurance andproduction control purposes.6. Apparatus6.1 A rigid round wood or metal pole, preferably

14、vertical, isused to mount the subject product such that pole deflection isminimized.1This test method is under the jurisdiction of ASTM Committee F08 on SportsEquipment and Facilities and is the direct responsibility of Subcommittee F08.16 onArchery Products.Current edition approved May 1, 2010. Pub

15、lished May 2010. Originallyapproved in 2001. Last previous edition approved in 2006 as F2126 06. DOI:10.1520/F2126-06R10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refe

16、r to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.1.1 The mounting pole diameter shall be 10 in. (254 mm),6 1 in. (25.4 mm).6.2 The load shall be applied using either calibr

17、ated weightsor a mechanical device in conjunction with a calibrated loadcell.6.2.1 The use of calibrated weights requires that weightplacement be accurate to assure that the load applicationcentroid is coincident with the boundaries defined and meetsthe requirements as given in 6.4. Caution should b

18、e exercisedfor operator protection with the use of weights in case ofslippage or premature failure.6.2.2 The use of a mechanical device such as a tensiletesting machine or hydraulic power, in combination withpulleys, fulcrums or bearings to re-direct forces, requires theuse of a calibrated load cell

19、 attached adjacent to the test subjectto account for friction losses.6.3 Calibrated deflection measuring devices (such as dialindicators or optical laser) shall be used to measure movementof the test subject under load. The accuracy of the measuringdevices shall be at within 0.010 in. (0.254 mm) and

20、 repeatablewithin 0.005 in. (0.127 mm). The devices shall measuremovement parallel to the direction of the applied load and shallbe mounted in such a manner to eliminate deflection of the testapparatus and be placed, as a minimum, as follows:6.3.1 There shall be at least two measurements taken at th

21、eload; one on each side and 6 in. (152.4 mm) from the center ofload application.6.3.2 A deflection measurement shall be taken at two pointsfurthest from the mounting pole, one on each side symmetricalwith the test subject.6.3.3 A deflection measurement shall be taken at two points6 in. (152.4 mm) fr

22、om the mounting pole, one on each sidesymmetrical with the test subject.6.4 The application of the load shall be at the centroid of theplatform area for standing platforms or the centroid of the usersload application area for handclimber (climbing aids).6.4.1 For standing platforms, the load shall b

23、e applied to thetest subject over one hundred 100 in.2(0.065 m2) area bymeans of a flat square steel plate 10-in. (254-mm) wide and aminimum of12-in. (12.7-mm) thick. The edges of the loadplate adjacent to the test subject shall be de-burred with0.015/0.030 in. (0.381/0.762 mm) radius to reduce dama

24、ge tothe test subject by sharp corners.Asingle layer of thin maskingtape may be applied to the surface of the load plate contactingthe test subject to reduce scratching and improve friction.NOTE 1Load attachment structure must be secured to this load platetherefore fabrication by welding must assure

25、 that the plate remain flat andfree of distortion.6.4.2 Handclimbers (climbing aids) shall have the loadapplied along the centroid of the supporting structure furthestfrom the test pole (which by design must be capable of directlysupporting the users weight during normal use) by means of a4-in. (101

26、.6-mm) wide steel plate or rigid shape of sufficientlength to horizontally span the width of the test subject.6.4.3 For two piece (stand/sit) climbing treestands withmovable non-rigid seats (such as mesh, slings, or similar) thatcan be slid forward or backward during normal use, twoadditional separa

27、te tests shall be conducted on the seat. Thefirst test shall be conducted with the load applied to thecentroid of the non-rigid platform with the non-rigid platformlocated in its normal position, typically in the center of thesupporting structure, using the square plate in accordance with6.4.1. The

28、second test shall be conducted with the load appliedalong the centroid of the supporting structure furthest from thetest pole, which by design must be capable of directlysupporting the users weight during normal use. (For example,the horizontal framing member of a treestand where the usermust suppor

29、t his or her weight during normal stand up/sit downclimbing procedures.) For this second case, a rigid steel barshould be used to distribute the load over a 16-in. (406.4-mm)wide area length of the supporting structure6.5 For fixed position treestands, the test shall be repeatedwith the load applied

30、 to the seat and in accordance with 6.4.1,7.5 and 7.7. For climbing treestands in which the seat is notused during the climbing, that is, a handclimber or climbing aidis used, refer to Test Method F2531 for seat requirements.6.6 In addition to the platform ladder, tripod and climbingsticks shall hav

31、e a minimum of two steps tested for static loadwith the load applied over a 3-in. (76.2-mm) wide portion ofthe step in the center of the step, or where a foot wouldinterface with the step.7. Procedure7.1 Read instructions accompanying the test subject toascertain the proper procedure for use and mou

32、nting and securethe test subject to the mounting pole such that the platform(plane of the platform) is perpendicular to the mounting pole.If necessary, use minimum auxiliary temporary means tomaintain the subject in the correct position during set-up.(Frictional forces, without a load on the subject

33、, may not besufficient in some cases for the subject to remain in position. Asmall band on the mounting pole may be necessary).7.2 By geometric means, determine the location of thecentroid of the platform area and mark accordingly. Place theload plate centerline coincident with the centroid of thepl

34、atform.7.3 Determine if the test subject will deflect sufficientlyduring the test to allow the load plate to slip or shift. If so,provide auxiliary means such as clamps or stops to eliminatesideways movement of the load plate. The load must be appliedas given in 6.4 and must be continuously applied

35、parallel to themounting pole throughout the entire test.7.4 Locate and mount deflection measurement devices, orreference points using optical laser, as given in 6.3.7.5 The initial load for beginning the test shall be one-fourthof the test subjects rated capacity. Example: a test subject witha rated

36、 capacity of 400 lbs (882 kg) shall begin the test at a loadof 100 lbs (200 kg). Loads shall be increased by 25 %increments up to the test subjects rated capacity after whichthe load shall be increased to 150 %, 175 % and 200 % of therated capacity, respectively.After the load meets or exceeds thera

37、ted capacity, it shall be returned to zero and checked foryielding.7.6 At each load value exceeding the rated capacity (testpoint), the load and all deflection measurements shall berecorded. The load shall then be removed and the deflectionmeasurements re-recorded. A note shall be made of anyF2126 0

38、6 (2010)2measurement that does not return to within 0.200 in. (5.080mm) of its initial value.After the load is removed, all deflectionmeasurements shall be checked, and the test subject visuallyinspected for permanent deformations by yielding.7.7 The load shall incrementally increase until it is det

39、er-mined that (1) a factor of safety of 2.0 has been met, or (2)permanent deformation (yielding) has occurred.8. Report8.1 Deflection readings shall be discarded only when acalibration change is discovered after readings have been madeor when improper operator techniques can be cited.8.2 Recording o

40、f results shall include the following:8.2.1 Identification of test subject model, manufacturer, andrated capacity.8.2.2 Photograph of test subject.8.2.3 Photograph of test set-up (three views: side, top, andend).8.2.4 Load and deflection measurements at all test points.8.2.5 Verification of calibrat

41、ion.8.2.6 Date of test.8.3 Determination of Factor of Safety:8.3.1 When yielding or permanent deformation has beenreached as given in 7.7, the corresponding load in pounds shallbe noted as the yield load.8.3.2 The factor of safety shall be calculated by dividing themanufacturers rated capacity of th

42、e test subject into theresulting yield load. For example, rated capacity-300 lbs (661.4kg), yield load-630 lbs (1,388.9 kg); therefore the factor ofsafety is 630/300 or 2.10 (usually noted as 2.10 SF).8.3.3 The factor of safety must meet or exceed 2.0.8.4 Pass-Fail Criterion:8.4.1 A treestand is con

43、sidered failed if it cannot supporttwice its rated load capacity without yielding or permanentdeformation. The deflection measurements can be used as anindication of permanent deformation but shall not be used aspass-fail criterion.8.4.2 If a treestand fails this test, the treestand and a copy ofthe

44、 test data shall be returned to the manufacturer.9. Precision and Bias9.1 No statement is made about either the precision or biasof this test method for measuring load capacity since the resultmerely states whether there is conformance to the criteria forsuccess specified in the procedure.10. Keywor

45、ds10.1 backbar; climbing aid; climbing stick; platform; tree-stand; tripodAPPENDIX(Nonmandatory Information)X1. Additional InformationX1.1 This test method is provided for use by manufacturersof treestands and testing companies. Criteria has been devel-oped for certification of treestands and this t

46、est method is anintegral part of the certification. However, a treestand conform-ing to this test method alone does not constitute certificationand those manufacturers desiring certification must meet allapplicable standards as a minimum requirement.ASTM International takes no position respecting th

47、e validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard i

48、s subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International He

49、adquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (ph