Health and Safety
Executive / Commission
Research reports
Commissioned following the meetings of June 2001 in Frankfurt of
ISO/TC 23/SC2. Working Group 5 of which subsequently produced ISO
DIS 5674 'Tractors and machinery for agriculture and
forestry-guards for power take-off (PTO) drive shafts - wear and
strength tests', incorporating the latest proposed changes to
the standard. These proposals included test methods and pass-fail
criteria, which were derived from various sources, including
practical tests, manufacturers own research and previous projects
sponsored by the HSE. Undertaken primarily to investigate
developments with CEN on the same subject under the terms of the
Vienna Agreement. The particular draft standard (PrEN 12965) is
intended to define the safety issues surrounding PTO shaft guards
and the tests it calls up are contained in EN 1152 which is the
equivalent of ISO 5674. The CEN working group will pass all
activities on this subject over to the ISO working group after it
has produced EN12965. It was also considered necessary to examine
how the standard could be applied to new designs of guard, which
are needed to fit shafts with an ever-increasing number of special
attachments. The designers are currently limited in how they can
adapt to technical change by the way the standard is written. It
was intended to provoke discussion, attract input from experts and
provide technical data, which would contribute to the process of
revising the standard.
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