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Application requirements:
To avoid damage to the LA27 with QR, it is necessary for certain parameters to be specified in the application.
You should therefore be aware of the following facts when supplying an LA27QR to a customer.
Constant pressure on the actuator:
• The QR concept is such that the actuator can pull with max.100 N. Therefore there must always be a load on the actuator when it is run inwards
to ensure correct operation.
• When the QR is activated there must be a minimum load on the actuator in order to ensure that the actuator runs inwards.
This load is depends on the spindle pitch: 5 mm must have 750 N load. 6 mm must have 500 N load.
Mechanical stop in the application:
• When the QR is activated the actuator will run inwards, until it blocks. Depending on the specification, the actuator will run inwards until either
the spindle nut runs against the sliding bearing or when the end plug of the inner tube runs against the spindle.
• The solution is not constructed to absorb the impact that can occur when the QR is activated and the actuator is driving into endstop with a
heavy load.
• Therefore there must be a mechanical stop built into the application to stop the movement 5mm before the actuator runs into endstop and blocks.
Activation of QR function:
• If the QR is activated at the same time as the actuator is running, then in order for the QR parts to get into position, it may be necessary first to
run the actuator in an inward direction using the handset until the QR parts are in place.
Use of the QR function:
• LA27 with QR is designed to be used as part of the back rest function on a bed. When a situation occurs where the patient in the bed has to lie
down as quickly as possible, the QR function is activated and the back rest can be lowered, when the actuator is no longer in motion the QR
handle is released.
Locking plate must be mounted:
• To ensure that the Bowden cables are fixed correctly the locking plate must be mounted.
Quick Release cable dimensions:
• The release cable has to be provided by the customer.
• The force required to operate the Quick Release is approx. 1 - 28 kg., depending on the actuator load.
• When operating the Quick Release function, the Quick Release must be activated all the way down and not stopped halfway!
• The Quick Release can only be ordered with 5 and 6 mm pitch.
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