A processor operator was trimming the butt on a log. The processor bar and chain
were perpendicular to and directly in line with the front window of the operator's
cab. The saw chain had been repaired with used connecting links. The saw motor
overspeeded the chain, exceeding the chain manufacturer's speed rating. The chain
broke. A drive link with side plates broke free and was propelled through the
1/2 -inch thick polycarbonate window. This "chain shot" struck the operator
in the abdomen, inflicting serious injury. Research shows that similar accidents
have occurred.
What
should be done to prevent a similar incident
- Follow
the manufacturer's instructions:
- Never use the saw so that the saw bar is directly in line with the cab or other
persons.
- Ensure chain speed does not exceed the chain manufacturer's rating.
- Do not reuse riveted connecting components.
- Follow the recommended maintenance
practices for the chain, bar, and sprocket.
- Ensure that the chain has adequate
lubrication.
- Consider
installing a chain catcher designed to minimize the chance of chain shot.
- Consider
upgrading the front window from 1/2-inch polycarbonate (which will not stop all
chain shots) to 1 1/4-inch laminated polycarbonate or equivalent, which is proven
to stop such projectiles.
- Keep
ground workers at least 70 metres (230 feet) away from a working harvester/processor.
To see a slide show on this incident, visit the web site
at
www2.worksafebc.com/publications/multimedia/slideshows.asp?reportID=33843.
See
page 2 for relevant sections of the Regulation.
Relevant sections of the Occupational Health and Safety Regulation*
4.3
Safe machinery
and equipment
(1)
The employer must ensure that each tool, machine and piece of equipment in the
workplace is
16.21
Protective structures
(1) Operators of mobile
equipment must be protected against falling, flying or intruding objects or material
by means of suitable cabs, screens, grills, shields, deflectors, guards or structures.
...
*The
sections of the Occupational Health and Safety Regulation listed in this bulletin
do not imply a breach of the Regulation on the part of any party that may have
been involved with this incident. The purpose in listing specific sections of
the Regulation is to make readers aware of some of the applicable sections of
the Regulation.
