An adjustable bed is shown having an adjustable frame which supports
an articulated mattress. The frame mounts a single motor which lifts
a first adjustable section thereof through a threaded drive shaft.
A push linkage connects from the first adjustable section of the
frame back to the frame itself where a conversion plate connects
the push linkage to a pull linkage. The pull linkage connects to
a second adjustable section of the frame. The single motor thus
raises the first adjustable section and, through the linkage, the
second adjustable section.
An adjustable bed is particularly adapted for the care of patients
at home, and comprises a stationary frame, and a mattress support
having a head section, a center section, and a foot section, which
are hingedly interconnected. A lift arm has opposing ends thereof
pivotally connected with the frame and the mattress support center
section respectively, and includes a power device which selectively
pivots the lift arm to raise and lower the mattress support thereby
adjusting patient elevation. A longitudinally extending motor has
opposing ends thereof pivotally connected with the frame and the
mattress support center section at a point spaced from the lift
arm center section pivot, whereby motor extension and retraction
pivots the mattress support about the lift arm pivot, thereby bodily
tilting the same for adjusting patient inclination.
A safety device for an adjustable bed having an articulated mattress
is shown including a power drive module having adjustable sections
that support corresponding sections of the articulated mattress.
Multiple winding electrical motors are mounted within the drive
module for driving the adjustable sections through linkages. Due
to the weight of the articulated mattress and adjustable section,
the linkages are always in tension. However, should a foreign object,
such as a hand, be placed below the mattress supporting section
as it is lowered, the linkage will be exposed to a compression force.
A switch is mounted within the linkage to sense the compression
force and inhibit the motor winding which lowers the bed. However,
the winding which raises the adjustable bed continues to be enabled
to permit the bed to be raised and the foreign object removed.
Disclosed herein is an adjustable support frame for an adjustable
bed or the like comprising an articulable load-bearing portion having
a head element articulably connected to said base, a middle element
articulably connected to said head element, and a foot element articulably
connected to said middle element. Adjustable support means communicate
between said base and each of said middle and foot elements for
both supporting said elements over said base as well as for adjusting
the position of said elements relative to each other and to said
base without affecting the position of said head element relative
to said base.