1、BRITISH STANDARD BS 6916-9: 1988 ISO7915:1985 Chain saws Part 9: Specification for strength of handles ISO title: Forestry machinery Portable chain-saws Handles Determination of strength UDC674.053:621.93:621.932.5:621.936.6:620.17BS6916-9:1988 This British Standard, having been prepared under the d
2、irectionof the Agricultural Machinery and Implements Standards Committee, waspublished under theauthorityofthe BoardofBSIand comesintoeffecton 30December1988 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference AGE/29 Draft for comment 84/74951 DC ISBN 0
3、580 16328 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Agricultural Machinery and Implements Standards Committee (AGE/-) to Technical Committee AGE/29, upon which the following bodies were represented: Arboricultural Association Bri
4、tish Agricultural and Garden Machinery Association Ltd. Consumer Policy Committee of BSI Consumers Association Department of Trade and Industry (Consumer Safety Unit, CA Division) Forestry Commission Health and Safety Executive National Farmers Union National Union of Agricultural and Allied Workers
5、 Amendments issued since publication Amd. No. Date of issue CommentsBS6916-9:1988 BSI 11-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope and field of application 1 2 References 1 3 Test procedure 1 4 Test requirements 1 Figure Directions of load applicatio
6、ns 1 Table Handle strength test loads 1 Publications referred to Inside back coverBS6916-9:1988 ii BSI 11-1999 National foreword This Part of BS6916 has been prepared under the direction of the Agricultural Machinery and Implements Standards Committee. It is identical with ISO7915:1985 “Forestry mac
7、hinery Portable chain-saws Handles Determination of strength” prepared by Technical Committee ISO/TC23, Tractors and machinery for agriculture and forestry, of the International Organization for Standardization (ISO). Other Parts of BS6916 are as follows: Part1: Glossary of terms; Part2: Method for
8、specifying requirements; Part3: Specification for dimensions of front hand guards; Part4: Specification for strength of front hand guards; Part5: Methods of evaluating chain brake performance; Part6: Method of measurement of airborne noise at the operators position; Part 7: Method of evaluating engi
9、ne performance including fuel consumption; Part8: Method of measurement of hand-transmitted vibration; Part10: Specification for longitudinal balance; Part11: Specification for general design, performance, safety and construction requirements for internal combustion engined machines 1) . Terminology
10、 and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. Where the w
11、ords “International Standard” appear, referring to this standard, they should be read as “Part of BS6916”. The Technical Committee has reviewed the provisions of ISO7914, to which reference is made in the text and which is now published, and has decided that they are acceptable for use in conjunctio
12、n with this standard. It is anticipated that ISO 7914 will be implemented as a future Part of BS6916. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standar
13、d does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated.
14、 This will be indicated in the amendment table on the inside front cover. 1) In preparation. Cross-references International Standard Corresponding British Standard ISO6533:1983 BS6916 Chain saws Part3:1988 Specification for dimensions of front hand guards (Identical)BS6916-9:1988 BSI 11-1999 1 1 Sco
15、pe and field of application This International Standard specifies a test method and the requirements for the strength of the handles of portable hand-held combustion engine chain-saws for use primarily in forestry. 2 References ISO6533, Forestry machinery Portable chain saws Front hand guard Dimensi
16、ons. ISO7914, Forestry machinery Portable chain-saws Minimum handle clearance and sizes 2) . 3 Test procedure The test temperature shall be20 5 C. The chain-saw handles shall be subjected to static loads as specified in the Table, separately applied at the handle grip mid-point, in each of the six d
17、irections illustrated in the Figure. In each case the chain-saw shall be fixed rigidly by the guide-bar clamped in a vice with a minimum clearance of15mm between the vice and any part of the body of the saw, so that they do not touch during the test. The load shall be applied over an area of not mor
18、e than75mm in width, centred on the normal hand-grip area for both the front and rear handles. Where necessary, brackets may be clamped to the handles to facilitate side loading or loading in the Z direction. The load direction shall remain constant relative to the mounting, despite any deflections
19、of the handles or saw. 4 Test requirements The chain-saw handles shall not break or crack when tested in accordance with clause 3. Before and after the test, the dimensions of the handles shall comply with ISO6533 and ISO7914. Table Handle strength test loads 2) At present at the stage of draft. Cha
20、in-saw engine displacement Minimum test loads Front and rear X 1 and X 2 Up and down Y 1 and Y 2 Right and left Z 1 and Z 2 cm 3 N N N u 50 50 andu 82 82 900 1350 1800 900 1350 1800 450 650 900 Figure Directions of load applications2 blankBS6916-9:1988 BSI 11-1999 Publications referred to Seenationa
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