Full revolution clutch press with safeguards
Full Revolution Clutch as defined
by OSHA, [29 CFR 1910.211(d)(5)], is a type of clutch that, when tripped, cannot be
disengaged until the crankshaft has almost completed a full revolution and
the press slide a full stroke.
This type of press was designed to make one full machine
stroke or crankshaft revolution after each engagement of the mechanical pin,
collar, or rolling key.
The worker will activate the machine
through a foot
switch or palm buttons.
Once this is done the press will perform a full stroke, barring any
mechanical failures, before stopping at top dead center (TDC).
This inability to stop the machine stroke poses a hazard to the
operator and other workers.
The biggest hazard when
working with either full or part revolution mechanical power presses
is the point of operation. A hand or any body part in this area can
result in crushed or severed limbs or even fatalities.
- The following are OSHA and ANSI recognized methods for
safeguarding the point of operation on full revolution clutch
mechanical power presses: