Hill-Rom CareAssist P1170, Service Manual

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Mechanical System
Chapter 3: Theory of Operation
Page 3 - 2 CareAssist™ Bed Service Manual (man330)
Mechanical System
The mechanical subsystem consists of two connected systems:
• Bed frame
• Sleep surface
Retractable Head Section
The retractable head section feature is achieved by controlling a sliding
movement of the head section frame with two sliding blocks in channels at
each side of the intermediate frame. This lets the head section frame extend
(with respect to the seat section). The hard surface also extends (with respect to
the head section frame) towards the head end. This is achieved by the two
elevation arms of the head section frame that terminate in gear teeth interfaced
with the notches in the rear of the head section hard surface and move the hard
surface towards the head end as the head section is raised.
Emergency CPR Release
The CPR control handles are located at the head end of the bed, under each
corner of the sleep deck. Pulling one of the handles disengages the driving gear
of the head section motor inside the actuator. This lets the head section drop
under the pull of gravity, assisted/cushioned by two gas springs.
Extendable Foot Section
The extendable foot section lets the caregiver add an additional 4" (102 mm) to
the length of the bed. The movement is controlled by a lever under the foot end
of the bed. Pulling up on the lever and pulling the foot section out, extends the
section. The foot section locks into place when extended or retracted.
Hilow System
WARNING:
The column must be replaced if it becomes defective. The column must
never be dismantled. Failure to observe this warning could result in
personal injury.
The hilow system features two columns each composed of three sections that
slide in relation with each other by a pantograph system. This system is driven
by a fixed motor installed at the base of the mechanism. This system lets the