Guarding Safety Meeting Series

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GuardingSafety Meeting Series
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Guarding Related Injuries

• Every year there are multiple fatalities from
  workers getting caught in unguarded exposed
  moving parts
• Over 6000 claims are allowed each year at WSIB
  for machinery related injuries, most of which are
  quite serious in nature
• Orders written by the MOL have increased from
  18,000 in 1995 to over 90,000 in 2006. Guarding
  orders make up a significant amount of those
  orders

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Legislation

• Excerpts from the Regulations for Industrial
  Establishments
• 24. Where a machine or prime mover or
  transmission equipment has an exposed moving part
  that may endanger the safety of any worker, the
  machine or prime mover or transmission equipment
  shall be equipped with and guarded by a guard or
  other device that prevents access to the moving
  part.
• 25. An in-running nip hazard or any part of a
  machine, device or thing that may endanger the
  safety of any worker shall be equipped with and
  guarded by a guard or other device that prevents
  access to the pinch point.

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Types of Guards

• Fixed
• Interlocked
• Adjustable

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Fixed Guards

• A permanent part of the machine
• Not dependent on any other part to perform the
  function
• Usually made of sheet metal, screen, bars or
  other material which will withstand the
  anticipated impact
• Generally considered the preferred type of guard.
  
• Simple and durable

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Fixed Guards
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Interlocked Guards

• Usually connected to a mechanism that will cut
  off the power automatically
• Could use electrical, mechanical or hydraulic
  systems
• Will need a reactivation of the start function to
  get the machine up and running again

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Interlocked Guards
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Interlocked Guards
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Adjustable Guards

• Very flexible to accommodate various types of
  stock
• Openings are determined by the movement of the
  stock. As operator moves stock the guard is
  pushed away providing an opening only large
  enough to admit the stock. Protects operator by
  placing a barrier between the danger area and the
  operator

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Permissible Openings (CSA, Vaillancourt Snook,
1998)

• Distance from
• opening (inches)
• 0 - 0.5
• 0.5 - 2.5
• 2.5 - 3.5
• 3.5 - 6.5
• 6.5 - 17.5
• 17.5 36.0
• Over 36

• Max. width of
• opening (inches)
• Not allowed
• .25
• .375
• .625
• 1.25
• 1.875
• 5 (not on scale

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PPHSA Guarding Stick
Used to determine if opening to exposed moving
part is small enough
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Other Devices

• Presence Sensing
• Safety Trip Controls
• Two Handed Controls
• Gate/Shields

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Presence Sensing

• Prevents or stops normal stroking a machine if
  the operator's hands are inadvertently placed in
  the point of operation
• Presence sensing devices are commonly referred to
  as light curtains

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Presence Sensing Devices
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Safety Trip Controls

• Quick means for deactivating the machine in an
  emergency situation
• Can be a pull cord, bump bar, foot peddle
• Similar to a light curtain, it must deactivate
  the equipment quickly enough to prevent access to
  danger zone or at least to limit the injury

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Two Hand Trip

• Requires concurrent application of both the
  operators control buttons to activate the
  machine cycle, after which the hands are free
• The trip must be placed far enough from the point
  of operation to make it impossible for the
  operator to move his or her hands into the danger
  area before the equipment cycles

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Two Hand Trip
Both buttons utilized at the same time to open
and close press sections
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Gates/Shields

• Barrier protecting the operator at the point of
  operation - before the machine cycle can be
  started
• Perimeter safeguard protecting operators and
  pedestrian traffic

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Gates
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Shields
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Guarding Checklist

• A simple assessment tool to determine if the
  guarding and devices in the plant are adequate
• Provides opportunity to recommend changes to
  existing guards and devices