Affinity® Four Birthing Bed Service Manual (195826 REV 2) 3 - 1
3
Chapter 3
Theory of Operation
INTRODUCTION
The Theories of Operation for the Affinity® Four Birthing Bed are as follows:
• Mechanical System
• Electrical System
• Air System (optional)
The interaction between these subsystems lets all the operational functions be used.
The Electrical system diagrams are at the end of this chapter.
MECHANICAL SYSTEM
The mechanical subsystem has two connected systems:
• Bed frame
• Sleep surface
HEAD SECTION
The head section features an electric motor that uses leverage to elevate the patient’s torso and head. A
hinge joins the head section to the seat section, which moves at the same time as the head section, to
provide more patient support and comfort.
SEAT SECTION
The seat section is connected by a hinge to the head section. When the head section is raised, the seat
section lowers at the hinge, to provide more patient support and comfort.
FOOT SECTION
The foot section features an electric motor that moves a pantograph structure in order to raise and
lower the patient’s legs and feet. On beds with a lift-off foot section, an optional utility tray can be
installed to support tools and equipment.
EMERGENCY CPR RELEASE
The CPR control handles are at the middle of the bed, under the hinge between the seat section and the
head section 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, and
cushioned by a single gas spring/damper.
HILOW SYSTEM
The hilow system features an electric motor that moves a pantograph structure in order to raise and
lower the upper frame of the bed.
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