DRAFT UGANDA STANDARD

Transcription

1 DRAFT UGANDA STANDARD DUS First Edition Metal Chairs for 0ffice Purposes Part. 2: Revolving and Tilting- Specification Reference number DUS :2017 UNBS 2017

2 DUS :2017 Compliance with this standard does not, of itself confer immunity from legal obligations A Uganda Standard does not purport to include all necessary provisions of a contract. Users are responsible for its correct application UNBS yyyy All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilised in any form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written permission from UNBS. Requests for permission to reproduce this document should be addressed to The Executive Director Uganda National Bureau of Standards P.O. Box 6329 Kampala Uganda Tel: /1/2/3 Fax: info@unbs.go.ug Web: ii UNBS 2017 All rights reserved

3 DUS :2017 Contents Page Foreword... iv 1. Scope...Error! Bookmark not defined. This standard (Part 2) covers the requirements of materials, dimensions, construction and finish of revolving and tilting metal chairs for office purpose Normative References Terms and Definitions...Error! Bookmark not defined. 4. Requirement Assembly Finish Metal Components Performance Requirements of Finish Scratch Hardness Test Pressure Test Flexibility and Adhesion Test Stripping Test Test for Protection against Corrosion under Conditions of Condensation Packing Information to be supplied by the Purchaser Marking... 4 Bibliography... 5 UNBS 2017 All rights reserved iii

4 DUS :2017 Foreword Uganda National Bureau of Standards (UNBS) is a parastatal under the Ministry of Trade, Industry and Cooperatives established under Cap 327, of the Laws of Uganda, as amended. UNBS is mandated to coordinate the elaboration of standards and is (a) a member of International Organisation for Standardisation (ISO) and (b) a contact point for the WHO/FAO Codex Alimentarius Commission on Food Standards, and (c) the National Enquiry Point on TBT Agreement of the World Trade Organisation (WTO). The work of preparing Uganda Standards is carried out through Technical Committees. A Technical Committee is established to deliberate on standards in a given field or area and consists of key stakeholders including government, academia, consumer groups, private sector and other interested parties. Draft Uganda Standards adopted by the Technical Committee are widely circulated to stakeholders and the general public for comments. The committee reviews the comments before recommending the draft standards for approval and declaration as Uganda Standards by the National Standards Council. The committee responsible for this document is Technical Committee UNBS/TC12 on furniture. iv UNBS 2017 All rights reserved

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7 DRAFT UGANDA STANDARD DUS :2017 Metal Chairs for Office Purposes- Specifications Part 2 Revolving and Tilting 1. Scope This standard (Part 2) covers the requirements of materials, dimensions, construction and finish of revolving and tilting metal chairs for office purpose 2 Normative References The following referenced documents referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated r US ISO :2011, Wrought aluminium and aluminium alloys Sheets, strips and plates Part 1: Technical conditions for inspection and delivery ISO :201, Hot-finished structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery conditions (tube) US 1633, Cold rolled low carbon steel flat products for cold forming Technical delivery conditions ISO :1995, High yield strength flat steel products -- Part 1: General requirements (sheets) ISO 2009:2011, Slotted countersunk flat head screws -- Product grade A. ISO :2014, Stainless steels for general purposes -- Part 3: Wire US ISO :2012, Wrought aluminium and aluminium alloys Extruded rods/ bars, tubes and profiles Part 1: Technical conditions for inspection and delivery ISO :2016,Welding and allied processes -- Types of joint preparation -- Part 3: Metal inert gas welding and tungsten inert gas welding of aluminum and its alloys 3. Fabrication 3.1 Base The base shall have minimum, four legs made from steel tubular pipes of wall thickness not less than 1.60 mm or from aluminum tubes with a wall thickness not less than 2.0 mm or from mild steel sheets not less than 1.0mm thick. The tubular pipe shall be either round or square in section. The outside diameter of the round tubular pipe shall be not less than 25 mm and in the case of square section the side of the square shall be not less than 20 mm. 3.2 Frame The frame for chair shall be made from steel tubular pipes of wall thickness not less than 1.20 mm or from aluminum tubes with a wall thickness not less than 2.0 mm. The tubes shall be either round or square in cross-section. The outside diameter of the round tubular pipes shall be not less than 25 mm and in the case of square section the side of the square shall be not less than 20 mm. 3.3 Revolving and Tilting Screw The chair shall have a fitting with a vertical axle for swiveling and a horizontal axle for tilting. The lateral movement is controlled by an adjustable spring or springs and their compression can be varied by a knob. UNBS 2017 All rights reserved 1

8 This fitting shall be capable of supporting a load of 150 kg placed in the seat without any wobbling when the seat is rotated or tilted. 3.4 Seat The seat shall be padded or caned 3.5 Back-Rest The back-rest shall not be less than 250 mm in height. It shall be caned or padded. 3.6 Castor Unit Castor unit shall be mounted on legs. Castor units shall have wheels or balls between the forks of the castor so as to allow easy rotation under load. The wheel or ball shall be hard and wearresistant and shall not be less than 20 mm and not more than 50 mm in diameter. 3.7 Ends of Tables The open ends of tubes shall be provided with caps made from metal, plastic or rubber. 3.8 Arm-Rests Arm-rests shall be made from wood suitable for furniture. The arm-rest may also be padded. These shall be so shaped as to ensure comfort to the users, and shall be fixed securely with screws from the under-side of the tubular arms. 4 Dimensions 4.1 The dimensions of the chair shall be as given in to Height of Seat The height of the seat of chair from the floor surface shall be adjustable within the range of 400 to 500 mm Width of Seat Minimum width of the seat shall be 450 mm measured at a point midway along the effective depth of seat Effective Depth of Seat Minimum effective depth of seat shall be 400 mm. This shall be measured from a vertical line through the centre of the front edge of the seat to a vertical line through the centre of the back of the seat Minimum overall dimensions of chairs shall be as follows: Overall height Overall width including arm rests 785 mm 535 mm 4. Material Requirement 4.1 Aluminum Tubes Aluminum tubes shall conform to US ISO : French Polish French polish shall conform to DUS: Wax Polish Wax polish shall conform to US: 573: Mild Steel Sheets Mild steel sheets shall conform to ISO : Steel Tubes Steel tubes shall conform to ISO 12633:2011: 4.6 Screws Screws shall conform to ISO 2009: UNBS 2017 All rights reserved

9 DUS : Wood The wood suitable for furniture shall be used 5. Assembly 5.1 The components shall be assembled by means of welding, bolting or screwing. 5.2 The method of gas, arc and spot welding shall conform to DUS: 1323, DUS 816 and DUS: 819 respectively. 5.3 Welding of aluminum parts shall be in accordance with ISO : Finish 6.1 Metal Components All dents, burrs and sharp edges 'shall be removed from the various components. The components shall be individually pickled, scrubbed and rinsed to remove grease, rust, scale or any other foreign element Immediately after pickling, all the mild steel parts shall be given phosphating treatment conforming to ISO 9587:2007 NOTE Putty shall be applied to all the surfaces requiring' filling and shall conform to IS: **. Aluminum primer shall conform to IS: ff Coat/coats of enamel paint shall then be applied as follows: a) Finish coat with enamels conforming to ISO : Aluminum parts may be anodized, if required by the purchaser. 6.3 Wooden Arms - The wooden arms shall be polished either with wax polish or a transparent glossy French polish, or stained dark and polished or lacquered as desired by the purchaser. 7. Performance Requirements of Finish 7.1 Scratch Hardness Test A sample of mild steel plate 150 X 50 mm in size and thickness mm and finished as described in 6 shall be subjected to scratch hardness test in accordance with ISO 1518:2011.A scratch, showing the bare metal, shall not be produced in the test sample. 7.2 Pressure Test Samples prepared from mild steel plates of thickness 0.3I5 mm and finished as described in 6 shall be subjected to pressure test. The metal surface shall not be rendered visible when the test pieces are separated after the test. UNBS 2017 All rights reserved 3

10 7.3 Flexibility and Adhesion Test A sample of mild steel plate 150 X 50 mm in size and thickness mm and finished as described in 6 shall be subjected to flexibility and adhesion test The paint film on the test piece shall not show damage, detachment or cracking when examined under X 10 magnification. 7.4 Stripping Test A sample of mild steel plate 150 X. 50 mm in size and thickness mm and finished as described in 6 shall be subjected to stripping test The scratch produced after the test shall be free from jagged edges. 7.5 Test for Protection against Corrosion under Conditions of Condensation A mild steel panel of size 150 X 100 mm and thickness 1.25 mm and finished as described in 6 shall be subjected to test for protection against corrosion under conditions of condensation. The metal surface shall show no signs of corrosion after the test 8. Packing 8.1 All the component parts shall be packed in such a way that no damage is caused to them during transit. 9. Information to be supplied by the Purchaser 9.1 The purchaser shall supply the following information to the supplier along with the order; a) Type of seat required; b) Type of back required; c) Whether castor unit required and what type; d) Colour of finish; and e) Where alternative methods of construction and finish are specified, these shall be clearly stated in the order. 10. Marking All metal chairs shall be marked with name, address/trade mark of the manufacturer, name of the product and country of origin. 4 UNBS 2017 All rights reserved

11 DUS :2017 Bibliography [1] ISO #####-#, General title Part #: Title of part UNBS 2017 All rights reserved 5

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13 DUS1910-2:2017 Certification marking Products that conform to Uganda standards may be marked with Uganda National Bureau of Standards (UNBS) Certification Mark shown in the figure below. The use of the UNBS Certification Mark is governed by the Standards Act, and the Regulations made thereunder. This mark can be used only by those licensed under the certification mark scheme operated by the Uganda National Bureau of Standards and in conjunction with the relevant Uganda Standard. The presence of this mark on a product or in relation to a product is an assurance that the goods comply with the requirements of that standard under a system of supervision, control and testing in accordance with the certification mark scheme of the Uganda National Bureau of Standards. UNBS marked products are continually checked by UNBS for conformity to that standard. Further particulars of the terms and conditions of licensing may be obtained from the Director, Uganda National Bureau of Standards. UNBS 2017 All rights reserved 7

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