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Mtrac winch for passenger elevation
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F2) Yale safety lock type YOSL
(Yale overspeed safety lock)
In the YOSL Yale safety lock, the speed of the safety rope running through
it is constantly scanned.
In the event of overspeed, the clamping mechanism is automatically closed.
After unloading, the system can be released again by hand using a lever.
The YOSL safety lock protects the access equipment against:
• Rupture of the suspension rope,
• Failure of the winch,
• Overspeed caused by being caught or stopped during downward travel
resulting in the suspension rope being no longer tightened.
Separate operating and assembly instructions are available
for Yale safety locks!
The safety lock type YISL
must not
be used for access
equipment with only one suspension!
G) Emergency limit switch UP
For safety reasons, at least one limit or emergency-limit switch should be
fitted at the top for each Yale winch for passenger elevation which, when
triggered, immediately stops all movements of the load.
For this purpose, a stop plate must be fitted on the suspension rope under
the rope swaging which triggers the limit switch.
Maintain a safety clearance of at least 1.0 m to the winch.
If there are any obstacles protruding into the path of the load, the stop
plate must be lowered so that the winch always stops early enough.
When an emergency-limit switch has been approached, no
further electrical movement is possible.
This means that the winch then must be lowered with the
manual descent (see section 2.6 C) until the actuating lever
of the emergency-limit switch is free again.
2.7 Information on remaining risks
Remaining risks exist which cannot be covered by the
design of Yale winches for passenger elevation and Yale
safety locks:
• Since the overload switch-off is normally set to the maximum load
capacity of the winch in the factory, the operating company must
check, if the useful load of the lifting tackle also corresponds to the
value of the overload switch-off and/or to the useful load of the winch.
If this check shows that a lower value is required, the overload switch-off
must be adjusted accordingly, either ex-works or by a trained person
or the specified useful load of the winch must be reduced.
• Yale safety locks can only perform their safety function, if the safety rope
between safety lock and the upper rope suspension is constantly kept
tightened, i.e. slack rope must always be prevented! For this reason,
an appropriate tensioning weight of up to approx. 10 kg must always
be fitted on the loose end of the safety ropes at a height of approx.
20 cm above the ground.
3. Putting the winch into service
3.1 Basic principles
The manufacturer is responsible for ensuring that the suspended access
equipment and the corresponding the suspension structure comply with
all relevant regulations.
In the sense of the EC machinery directive a manufacturer of access
equipment is defined as a person who assemblies attachments for the
lifting of persons (access equipment) from individual components such
as winches, catching devices, platforms and suspension structures.
3.2 Necessary components
• Yale winch(es) for passenger elevation with appropriate useful load;
• Yale safety lock(s) with at least the same useful load as the Yale
winch(es)
• Original Yale rope(s) with an appropriate length
• Connection cable with an appropriate length
• If necessary, rope sheave(s) with an appropriate useful load for return-
ing/reeving the rope.
Yale safet
y loc
k t
ype YISL
Yale safet
y loc
k t
ype Y
OSL
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