1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI British StandardsWB9423_BSI_StandardColCov_noK_AW:BSI FRONT COVERS 5/9/08 12:55 Page 1Synthetic saddle trees SpecificationBS 7875:2009BS 7875:2009 BRITISH STANDARDPublishing and copyright information
2、The BSI copyright notice displayed in this document indicates when the document was last issued. BSI 2009 ISBN 978 0 580 59281 2ICS 97.220.40The following BSI references relate to the work on this standard: Committee reference SW/136 Draft for comment 08/30167722 DCPublication historyFirst published
3、 December 1996Second edition, July 2009Amendments issued since publicationDate Text affected BRITISH STANDARD BSI 2009 iBS 7875:2009ContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Identification 15 Dimensions 16 Materials 27 Strength 28 Symmetry 39 Marking 5AnnexesAnne
4、x A (normative) Method of test for the deflection of saddle trees 6Annex B (normative) Method of test for the impact resistance of saddle trees 8Bibliography 9List of figuresFigure 1 Angle dimension for saddle trees 2Figure 2 Tree datum points 3Figure 3 Example of a symmetry measuring jig 4Figure A.
5、1 Datum points for saddle trees 7List of tablesTable 1 Identification and dimensions 1Table 2 Symmetry 4Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 10, an inside back cover and a back cover.BS 7875:2009ii BSI 2009BRITISH STANDARDForewordPub
6、lishing informationThis British Standard is published by BSI and came into effect on 31 July 2009. It was prepared by Panel SW/136/-/7, Saddle trees, under the authority of Technical Committee SW/136, Sports, playground and other recreational equipment. A list of organizations represented on this co
7、mmittee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 7875:1996, which is withdrawn.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal a
8、uxiliary verb is “shall”.Commentary, explanation and general informative material is presented in smaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of a contract. Users are re
9、sponsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BRITISH STANDARD BSI 2009 1BS 7875:20091 ScopeThis British Standard specifies requirements for saddle trees made from synthetic materials for saddles for general use (jumping, showi
10、ng, hacking, dressage and similar activities) but excludes saddle trees for use with saddles for racing and side saddle.NOTE BS 6635 specifies requirements for saddle trees made from wood.2 Normative referencesThe following referenced documents are indispensable for the application of this document.
11、 For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 641, Dimensions of small rivets for general purposesBS 1449-1, Steel plate, sheet and strip Part 1: Carbon and carbonmanganese plate, she
12、et and stripBS 3146-1:1974, Investment castings in metal Part 1: Carbon and low alloy steelsBS EN 10083-2:2006, Steels for quenching and tempering Part 2: Technical delivery conditions for non alloy steelsBS EN 10088-2, Stainless steels Part 2: Technical delivery conditions for sheet/plate and strip
13、 of corrosion resisting steels for general purposesBS EN 10111:2008, Continuously hot rolled low carbon steel sheet and strip for cold forming Technical delivery conditions3 Terms and definitionsFor the purposes of this British Standard, the following definition applies.3.1 saddle treeframework on w
14、hich a riding saddle is made4 IdentificationThe saddle tree shall be identified in accordance with Table 1.5 DimensionsThe angle of dimensions of the saddle tree shall be in accordance with Table 1.Table 1 Identification and dimensionsFitting Identification Angle A formed at head of tree (see Figure
15、 1)Narrow N 7584.9Medium M 8594.9Wide W 95105Extra wide XW 105+BS 7875:20092 BSI 2009BRITISH STANDARDFigure 1 Angle dimension for saddle treesAngle A6 Materials6.1 The synthetic material and metal components used for the saddle tree shall be such that the saddle tree conforms to Clause 7 and Clause
16、8.NOTE The synthetic material used for the saddle tree should be thermostatic between 0 C and 40 C. It should have a Shore hardness of at least 90 between 20 C and 40 C.6.2 Gullets shall be of either:a) pressed steel conforming to BS 1449-1 or BS EN 10111:2008, grade CR3 or grade HR4 P orb) forged s
17、teel conforming to BS EN 10083-2:2006, steel name C22E, steel number 1.1151; orc) cast steel conforming to BS 3146-1:1974, type CLA 4; ord) stainless steel conforming to type 304 HR or BS EN 10088-2.The gullets shall be not less than 2.95 mm thick and 25 mm wide at the apex of the plate. NOTE Any fi
18、nishing process should not affect the strength of the metal.6.3 Rivets used for the fitting of stirrup bars shall be of mild steel conforming to BS 641 and shall have a diameter of not less than 3.97 mm.7 Strength7.1 When tested in accordance with Annex A, the deflection shall be not more than 10 mm
19、 and the saddle tree shall not be damaged.7.2 When tested in accordance with Annex B, the permanent set shall be not more than 5 mm and the saddle tree shall not be damaged.NOTE The test methods specified in Annex A and Annex B are static tests. Attention is drawn to the fact that other types of tes
20、ting, such as dynamic stress testing, are currently in use. It is anticipated that future revisions of this document will include such methods.BRITISH STANDARD BSI 2009 3BS 7875:20098 Symmetry8.1 To ensure symmetry, measurements between datum points in Figure 2, relating to the right and left side o
21、f the tree, shall be in accordance with Table 2. These measurements shall be taken before the saddle is covered.Figure 2 Tree datum pointsYGLCLCRDLKLDRELERFZXJLHLBGRGLARALBS 7875:20094 BSI 2009BRITISH STANDARDTable 2 SymmetryComponent symmetry Points of referenceHead Y to AL= Y to ARBar position X t
22、o BL= X to BRWaist Y to CL= Y to CRSeat Y to DL= Y to DRCantle Y to EL= Y to ERBar pitch Z to GL= Z to GRBar height Z to HL= Z to HRWaist height Z to JL= Z to JR(as at C)Seat rail height Z to KL= Z to KR(as at D)NOTE 1 L=Left; R=Right.NOTE 2 All measurements should be equal within null2 mm.8.2 Toler
23、ances shall be measured using any device offering sufficient accuracy.NOTE An example jig has been developed for this purpose (see Figure 3).Figure 3 Example of a symmetry measuring jigBRITISH STANDARD BSI 2009 5BS 7875:20099 MarkingThe saddle tree shall be marked with the following information:a) t
24、he number and year of this British Standard, which shall be stamped, marked or engraved on the stirrup bar;1)b) the fitting identification (see Clause 4), which shall be stamped on the underside of the forepart of the tree.1)Marking BS 7875:2009 on or in relation to a product represents a manufactur
25、ers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third-party certification of conformity.BS 7875:200
26、96 BSI 2009BRITISH STANDARDAnnex A (normative) Method of test for the deflection of saddle treesA.1 PrincipleThe saddle tree is supported at specified points, subjected to a load through the stirrup irons and the deflection is measured. The saddle tree is then examined for visible damage.A.2 Apparat
27、usA.2.1 Stirrup bar, capable of withstanding a load of 10 103N.A.2.2 Steel former, of 152 mm diameter.A.2.3 Weights, or other means of loading the stirrups, to produce a downwards force of 8.9 103N null0.5 103N.NOTE This force is approximately equivalent to the downwards force generated by 2 000 lb.
28、A.2.4 Stopwatch, or similar timing device.A.2.5 Measuring instrument (e.g. a rule), capable of measuring in increments of 1 mm.A.3 ProcedureA.3.1 Prepare the saddle tree as intended for use in a saddle. Fit with stirrup bar (A.2.1) and rivet on to withstand the test conditions using rivets conformin
29、g to 6.3.A.3.2 Place the saddle tree on the steel former (A.2.2) and mark datum points (Y and Z) on the saddle tree, measuring 178 mm from the top (X) of the front arch down on either side of the front edge of the tree as shown in Figure A.1.A.3.3 Load the saddle tree by gently adding weights (A.2.3
30、) evenly to the stirrups, so that a total force of 8.9 103N null0.5 103N is applied.A.3.4 Allow the load to act for 300 s null5 s, as measured with the stopwatch (A.2.4), and measure the deflection at the datum points (see A.3.2), using the measuring instrument (A.2.5).A.3.5 Remove the load and visu
31、ally examine the saddle tree for damage.A.4 Test reportThe test report shall contain the following information:a) the identity of the saddle tree;b) the deflection, when loaded, at the datum points, expressed in millimetres;c) whether or not the saddle tree was damaged; andd) the date of testing.BRI
32、TISH STANDARD BSI 2009 7BS 7875:2009Figure A.1 Datum points for saddle treesXY ZXY = XZ = 178 mmBS 7875:20098 BSI 2009BRITISH STANDARDAnnex B (normative) Method of test for the impact resistance of saddle treesB.1 PrincipleA mass is dropped onto the saddle tree and then the permanent set is measured
33、. The saddle tree is then examined for visible damage.B.2 ApparatusB.2.1 Steel disk, of 152 mm diameter and 50 mm thickness.B.2.2 Flat board, of dimensions 300 mm 900 mm.B.2.3 Weight, comprising a canvas sack and dry sand of mass 63.5 kg null3 kg.B.2.4 Lifting device, capable of lifting the weight (
34、B.2.3) to a height of between 122 mm and 183 mm above the flat board (B.2.2).B.2.5 Measuring instrument (e.g. a rule), capable of measuring in increments of 1 mm.B.3 ProcedureB.3.1 Support the saddle tree on the steel disk (B.2.1). Place the flat board (B.2.2) on the saddle tree such that it is supp
35、orted level on the saddle pommel overlapping by 150 mm null10 mm.B.3.2 Raise the weight (B.2.3) using the lifting device (B.2.4) to a height of 1.5 m null0.3 m above the board. Drop the weight (B.2.3) onto the saddle tree end of the board ensuring that the whole weight is transmitted to the saddle t
36、ree.B.3.3 Remove the saddle tree from the test equipment and measure the permanent set using the measuring instrument (B.2.5). Visually examine the saddle tree for damage.B.3.4 Test reportThe test report shall contain the following information:a) the identity of the saddle tree;b) the permanent set,
37、 expressed in millimetres;c) whether or not the saddle tree was damaged; andd) the date of testing.BRITISH STANDARD BSI 2009 9BS 7875:2009BibliographyBS 6635, Specification for saddle trees made from woodBS 7875:200910 BSI 2009BRITISH STANDARDThis page deliberately left blankThis page deliberately l
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