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है”ह”ह

IS 11113 (1999): Earth-Moving Machinery, and Tractors andMachinery for Agriculture and Forestry - Seat Index Point[MED 7: Material Handling Systems and Equipment]

Indian Standard

EARTH-MOVING MACH-INERY, AND TRACTORS AND MACHINERY FOR AGRICULTURE AND FORESTRY

- SEAT INDEX POINT

( Second Revision )

ICS 53.100

0 BIS 1999

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

June 1999 Price -Group 3

Bulk Handling Systems and Equipment Sectional Committee, HMD 07

NATlONAL FOREWORD

This Indian Standard which is identical with IS0 5353 : 1995 ‘Earth-moving machinery, and tractors and machinery for agriculture and forestry - Seat index point’ issued by the International Organization for Standardization ( IS0 ), was adopted by the Bureau of Indian Standards on the recommendations of the Bulk Handling Systems and Equipment Sectional Committee and approval of the Heavy Mechanical Engineering Division Council.

This standard was first published in 1985. This ( second ) revision has been carried out to align it with IS0 5353 : 1995.

The text of IS0 standard has been approved for publication as Indian Standard without deviations. Certain terminology and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words’lnternational Standard’appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practice is to use a full stop ( . ) as the decimal marker.

In the adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated:

International Standard Corresponding Indian Standard Degree of

Equivalence

IS0 3339-O : 1986 Tractors and IS 9939 : 1981 Glossary of terms relating Related machinery for agriculture and to agricultural tractors and power tillers forestry - Classification and terminology - Part 0 : Classif i- cation system and classification

IS0 6165 : 1987 Earth-moving IS 12138 : 1993 Earth-moving machinery Identical machinery - Basic types - - Basic types - Vocabulary ( first Vocabulary revision )

In reporting the results of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘.

IS 11113 : 1999 IS0 5353 : 1995

Indian Standard

EARTH-MOVING MACHINERY, AND TRACTORS AND MACHINERY FOR AGRICULTURE AND FORESTRY

- SEAT IN-DEX POINT

( Second Revision )

1 Scope

This International Standard specifies a method and the device for use in determining the position of the seat index point (SIP) for any kind of seat designed for earth-moving machinery as defined in IS0 6165, and tractors and machinery for agriculture and forestly as defined in IS0 3339-O.

This provides a uniform method for defining the lo- cation of the SIP in relation to a fixing point on the seat. The SIP may be determined on a seat by itself or with the seat located in its operating environment on the machine. The SlP.is a characteristic of the seat; therefore, it may be specified by the seat manufac- turer.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards.

IS0 3339-O: 1986, Tracrors and machinery for agricul- ture and forestry - Classification and terminology - Part 0: Classification system and classification.

IS0 6165:1987, Earth-moving machinery - Basic types - Vocabulary.

3 Definitions

For the purposes of this International Standard, the following definitions apply.

3.1 seat index point; (SIP): Point on the central vertical plane of the seat as determined by the device shown in figure 1, when installed in the seat as specified in 5.3.

NOTES

1 The SIP is fixed with respect to the machine and does not move with the seat through its adjustment and/or os- cillation range.

2 The SIP as established and defined by this International Standard may be considered, for operator work-place design purposes, to be equivalent to the intersection on the central vertical plane through the seat centreline of the theoretical pivot axis between a human torso and thighs.

3.2 fixing point: Point specified by the manufac- turer to which the SIP is referenced.

See figures 2 and 3 for examples.

4 Multiple machine function seats

Some seats are designed to locate and fix an operator to perform more than one function wjth a given ma- chine. Where a second position of the seat is provided because the machine or tractor has a second set of controls, the SIP of the seat has two locations relative to the machine or tractor, one for each position, as if there were two seats in the machine or tractor. The first location of the SIP shall be used for those Inter- national Standards appropriate to the first location and set of rontrols and the second location of the SIP shall be used for those International Standards appropriate to the second location and set of controls.

1

IS 11113 : 1999 IS0 5353 : 1995

5 Technical requirements

5.1 Device for seat index point (SIP) determination

The device for determining the SIP shall comply with figure 1. The mass of the device shall be 6 kg + 1 kg. The work surfaces of the device shall be of hardwood (sanded with 200 or finer grit paper or equivalent and polished) or equivalent material with the same performance to provide minimum friction with the muslin cloth in 5.3.1.

5.2 Adjustments when determining the seat index point (SIP)

When the relevant adjustments are a part of the seat and its suspension, the seat shall be adjusted ac- cording to the following sequential steps before de- termining the SIP.

5.2.1 Seat adjustment

All fore, aft, vertical and angular adjustments shall be placed in their centre position. When no centre pos- ition is possible, the nearest adjustment that will move the SIP device upward or rearward of centre shall be used.

5.2.2 Suspension system

Block the suspension system according to the manu- facturer’s instruction. If such instruction is not pro- vided, block the suspension system at the midpoint of its oscillation range.

Non-adjustable suspension shall be blocked in the vertical position attained with the weighted device in place.

-5.3 Seat index point ISIP) determination

The SIP shall be determined by using the device il- lustrated in figure 1 and applying the following pro- cedures.

5.3.1 Seat preparation

Allow sufficient time to ensure that the seat reaches a room temperature of 20 “C + 2 “C before starting the measurement procedure,

Place the seat on a level surface.

Seat a 75 kg f 10 kg person in the seat twice for 1 min periods to flex the seat and back cushions. Al-

2

low the seat to remain unloaded for a minimum period of 5 min before starting the measurement procedure.

Cover the seat with a single layer of muslin cloth of sufficient size to prevent direct contact and minimize friction between the cushion surfaces and the measurement device. Take care to prevent the cloth from influencing the positioning of the device.

5.3.2 Device placement

Place the SIP device, without additional masses, lat- erally central on the seat cushion pushing against the back cushion (see figure2). Ensure that the device is laterally controlled and level on the seat.

Add masses to bring the total mass of the device from 6 kg f 1 kg to 26 kg f 1 kg; the vertical force centre of the added masses shall be 40 mm in front of the SIP mark on the horizontal section of the device (see figure 1).

To obtain a good fit between the seat cushion, the back cushion, and the SIP measuring device, alter- nately apply and release a horizontal rearward force of approximately 100 N at the location noted in figure 1, and rock the device from side to side.

Add further masses to bring the total mass of the device from 26 kg + 1 kg to 65 kg + 1 kg such that the vertical force centre of the additional masses is 40 mm in front of the SIP mark on the horizontal section of the device (see figure 1).

NOTE 3 A 75 kg operator approximates the 65 kg weighted device on the seat.

Repeat the atternate loading and releasing, and the rocking of the device, checking to make sure the de- vice is laterally central and level on the seat.

5.3.3 Measurement

Make measurements on each side of the SIP meas- uring device at points an equal distance from the central vertical plane (see figure2). Average the val- ues. Record within &- 1 mm the coordinate dimen- sions of the SIP from the fixing point on the seat assembly (see figure31 that is defined by the manu- facturer.

Some machines have seats which fulfil multiple func- tions, usually by rotating the seat. Functions may in- clude using machine equipment or operating the machine in travel mode. For these cases, it may not be possible readily to calculate the location of the dif- ferent SIPS relative to the fixing point. In these cases, repeat 5.2 and 5.3 for each of the positions.

IS 11113 : 1999 IS0 5353 : 1995

5.4 Report

The test report shall include the following information:

c) a drawing or sketch of the seat assembly showing the coordinate dimensions between the fixing point and the SIP (see figure3 for an example);

a) reference to this International Standard; d) description of the seat adjustment ranges avail- able relevant to 5.2.

b) a full description of any test conditions or adjust- ments different from those sp~ecified in this Inter- national Standard;

IS 11113 : 1999 IS0 5353 : 1995

~B - B

Dimensions in mdlimetres

Central vertical force

f, = 100 N -

t 450

Figure 1 - Seat index point device

4

IS 11113 : 1999 IS0 5353 : 1995

Central vertical plane fl

Example of measuring poiflt. side 2

Example of measuring point, side 1

i.,. ,+Le of fixing point

Figure 2 - Seat with SIP device

5

IS 11113 : 1999 IS0 5353 : 1995

Y’ -

Example of fixing point

Z’

SIP at central

Lount ing swXg point examples

Figure 3 - SIP location

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau ofIndian StandardsAct, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard. of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Handbook’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Dot : No. HMD 07 ( 0496 ).

_I--

Amend No.

Amendments Issued Since Publication

Date of Issue Text Affected

-

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