1、Designation: F 2531 05An American National StandardStandard Test Method forLoad Capacity of Treestand Seats1This standard is issued under the fixed designation F 2531; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the staticload capacity of treestand seats in terms of a factor of safetyre
3、lative to 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 establish a
4、ppro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.2. Terminology2.1 Definitions:2.1.1 backbar or V-baradjustable component of a climb-ing treestand or hand climber that engages the tree to providesupport.2.1.2 climbing sticka device to a
5、ssist climbing a treeprimarily to a fixed position treestand. A structure that issecured to the tree and allows the user to support his weightand climb to the desired height on the tree.2.1.3 climbing treestandtreestand that provides both themeans to ascend the tree and allows the user to remain at
6、adesired elevation.2.1.4 hand climber or climbing aida device to assistclimbing with a climbing treestand. A structure that allows theuser to support his weight when lifting a climbing treestandwith his legs.2.1.5 ladder treestandtreestand that is secured to the treeat the elevation where the platfo
7、rm is located. (The laddertreestand may be secured to the tree at other locations and hassteps that are used to reach the platform or hunting position).2.1.6 non-climbing, fixed position or hang-on treestandtreestand that is secured to the tree at the elevation where it isused. (The user usually asc
8、ends the tree by some means andthen lifts the treestand to the desired position and secures it foruse.)2.1.7 treestanda device designed to be affixed to a tree orits branches so as to permit an individual to sit or stand on forthe purpose of attaining an elevated position from which toobserve, photo
9、graph or hunt.2.1.8 treestand seatthe portion or area of a treestand onwhich the user sits.2.1.9 tripod or tower standa tripod or tower stand (freestanding platform) is constructed to be self-supporting and isnot required to be secured to a tree.3. Summary of Test Method3.1 A treestand is mounted so
10、 that its platform is perpen-dicular or slightly above horizontal to a rigid wood or metalpole when the rated load is applied parallel to the mountingpole. The treestand seat frame is equipped with deflectionmeasurement devices. The ladder and tripod do not requiredeflection measurements to be taken
11、. The load is appliedincrementally and recordings are made of the load and deflec-tion at each increment until yielding or permanent deflectionoccurs, or until 112 3 (23 for two piece stand/sit climbingtreestands) the rated load is applied.4. Significance and Use4.1 This test method is intended for
12、quality assurance andproduction control purposes.5. Apparatus5.1 A rigid, round, wood or metal pole, preferably vertical,is used to mount the subject (except tripod) treestand productsuch that pole deflection is minimized.5.1.1 The mounting pole diameter shall be 10 6 1 in. (2546 25.4 mm).5.2 The lo
13、ad shall be applied using either calibrated weightsor a mechanical device in conjunction with a calibrated loadcell.5.2.1 The use of calibrated weights requires that weightplacement be accurate to assure that the load applicationcentroid is coincident with the boundaries defined and meetsthe require
14、ments given in 5.4. Caution should be exercised foroperator protection with the use of weights in case of slippageor premature failure.5.2.2 The use of a mechanical device such as a tensiletesting machine or hydraulic power, in combination withpulleys, fulcrums, or bearings to redirect forces, requi
15、res theuse of a calibrated load cell attached adjacent to the test subjectto account for friction losses.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 appr
16、oved Oct. 1, 2005. Published October 2005.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 Calibrated deflection measuring devices (such as dialindicators or optical laser) shall be used to measure movementof the test subject unde
17、r load. The accuracy of the measuringdevices shall be within .010 in. (0.25 mm) and repeatablewithin .005 in. (0.13 mm). The devices shall measure move-ment parallel to the direction of the applied load and shall bemounted in such a manner as to eliminate deflection of the testapparatus and be place
18、d, as a minimum, as follows:5.3.1 There shall be at least two measurements taken at theload, one on each side and 6 in. (152.4 mm) from the center ofload application.5.3.2 A deflection measurement shall be taken at two pointsfurthest from the mounting pole, one on each side symmetricalwith the test
19、subject.5.3.3 A deflection measurement shall be taken at two points6 in. (152.4 mm) from the mounting pole, one on each sidesymmetrical with the test subject.5.4 The application of the load shall be at the centroid of thetreestand seat area over a 100 in.2(645.16 cm2) area by meansof a flat rectangu
20、lar steel plate 10 in. (254 mm) wide by 10 in.(254 mm) long and a minimum of12 in. (12.7 mm) thick. Theedges of the load plate adjacent to the test subject shall bedeburred .015/.030 in. radius (0.381/0.762 mm) to reducedamage to the test subject by sharp edges. Likewise, the fourcorners of the load
21、 plate should have approximately .25 in.radius (6.35 mm) to reduce damage.NOTE 1Load attachment structure must be secured to this load plate;therefore, fabrication by welding must assure that the plate remain flat andfree of distortion.6. Procedure6.1 Read instructions accompanying the test subject
22、toascertain the proper procedure for use and mounting and securethe test subject to the mounting pole (except tripods) such thatthe platform (plane of the platform) is perpendicular to themounting pole. If necessary, use minimum auxiliary temporarymeans to maintain the subject in the correct positio
23、n duringset-up. (Frictional forces, without a load on the subject, maynot be sufficient in some cases for the subject to remain inposition. A small band on the mounting pole may be neces-sary).6.2 By geometric means, determine the location of thecentroid of the seat area and mark accordingly. Place
24、the loadplate centerline coincident with the centroid of the seat.6.3 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
25、be appliedas given in 5.4 and must be continuously applied in the verticaldirection throughout the entire test.6.4 Locate and mount deflection measurement devices, orreference points using optical laser, as given in 5.3.6.5 The initial load for beginning the test shall be one-fourthof the test subje
26、cts rated capacity. For example, a test subjectwith a rated capacity of 400 lbs (181.44 kg) shall begin the testat a load of 100 lbs (45.36 kg). Loads shall be increased by25 % increments up to the test subjects rated capacity, afterwhich the load shall be increased as appropriate to 125 %,150 %, an
27、d so forth, lb increments. After the load meets orexceeds the rated capacity, it shall be returned to zero andchecked for yielding.6.6 At each load value equal to or exceeding the ratedcapacity (test point) the load and all deflection measurementsshall be recorded. The load shall then be removed and
28、 thedeflection measurements re-recorded. A note shall be made ofany measurement that does not return to within .200 in. (5.08mm) of its initial value.After the load is removed, all deflectionmeasurements shall be checked, and the test subject visuallyinspected for permanent deformations by yielding.
29、6.7 The load shall incrementally increase until it is deter-mined that: (1) a minimum for 150 % (200 % for two piecestand/sit climbing treestands) of the rated load capacity hasbeen applied, or (2) permanent deformation (yielding) hasoccurred for treestands with integral seats (supported on thestand
30、ing platform).6.7.1 For two piece (stand/sit) climbing treestands or ladderstands with movable non-rigid platforms (seats such as mesh,slings or similar) that can be slid forward or backward duringnormal use, two separate tests shall be conducted with the loadapplied to the centroid of the non-rigid
31、 platform. The first testshall be conducted with the load applied to the centroid of thenon-rigid platform with the non-rigid platform (seat) located inits normal position, typically in the center of the supportingstructure. The second test shall be conducted with the loadapplied along the centroid
32、of the supporting structure furthestfrom the test 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 support his weight during normal stand up/sit downclimbing procedures.) For t
33、his second case, a rigid steel barshould be used to distribute the load over a 16-in. (406.4-mm)wide area of the supporting structure.7. Report7.1 Deflection readings shall be discarded only when acalibration change is discovered after readings have been madeor when improper operator techniques can
34、be cited.7.2 Recording of results shall include the following:7.2.1 Identification of test subject model, manufacturer, andrated capacity.7.2.2 Photograph of test subject.7.2.3 Photograph of test set-up (three viewsside, top, andend).7.2.4 Load and deflection measurements at all test points.7.2.5 Ve
35、rification of calibration.7.2.6 Date of test.7.3 Determination of Factor of Safety:7.3.1 When yielding or permanent deformation has beenreached as given in 6.7, the corresponding load in pounds shallbe noted as the yield load.7.3.2 The factor of safety shall be calculated by dividing themanufacturer
36、s rated capacity of the test subject into theresulting yield load. For example, rated capacity 300 lb (136.08kg), yield load 480 lbf (2135.15 N); therefore, the factor ofsafety is 480/300 (217.72/136.08 kg) or 1.60 (usually noted as1.60 SF).F25310527.4 Pass-Fail CriterionA treestand seat is consider
37、edfailed if it cannot support: (1) a minimum of 1.53 its rated loadcapacity without yielding or permanent deformation for tree-stands with integral seats (supported on the standing platform),or (2) a minimum of 23 its rated load capacity withoutyielding or permanent deformation for two piece (stand/
38、sit)climbing treestands or ladder stands with movable non-rigidplatforms. The deflection measurements can be used as anindication of permanent deformation, but shall not be used aspass-fail criterion.8. Precision and Bias8.1 No statement is made about either the precision or biasof this test method
39、for measuring load capacity, since the resultmerely states whether there is conformance to the criteria forsuccess specified in the procedure.9. Keywords9.1 backbar; platform; treestand; tripodAPPENDIX(Nonmandatory Information)X1. ADDITIONAL INFORMATIONX1.1 This test method provided for use by manuf
40、acturers oftreestands and testing companies. Criteria have been developedfor certification of treestands and this test method is an integralpart of the certification. However, a treestand conforming tothis test method alone does not constitute certification, andthose manufacturers desiring certifica
41、tion must meet all appli-cable standards as a minimum requirement.ASTM International takes no position respecting the 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 s
42、uch patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is 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 invi
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44、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 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F2531053
