BS 4220-1:1974

Co-operating organizations
Foreword
Specification
1 Scope
2 Definitions
3 Pre-test seat operation
4 The tractor
5 Repairs during tests
6 Calibration
7 Testing
Appendices
A Determination of seat reference point
B Verification of seat dimensions
C Static deflection test
D Lateral stability
E Ride vibration test
F Specimen test report
Tables
1 Ordinates of elevation, in centimetres, with respect
   to an arbitrary base-line, smoother track
2 Ordinates of elevation, in centimetres, with respect
   to an arbitrary base-line, rougher track
3 Vibration weighting factors
Figures
1 Apparatus for determination of seat reference point
2 Test construction on a seat
3 Schematic diagram of tractor seat position
4 Static deflection curves
5 Frequency weighting filter characteristics of
   'ridemeter'

Tests for a seat intended for a nominated tractor model; provides for measurement of transmitted vertical vibration on artificial track. Defines methods of measurement of important seat dimensions, static deflection and lateral stability characteristics. Specimen report included for guidance.