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O-RINGS
PISTONS
O-RINGS
RAM
RACK GEAR
RAM
HYDRAULIC LINE
PISTON
O-RING
O-RING
1. Trendelenburg, Back Section and Leg Sec-
tion Cylinders - The double action cylinders are
closed at one end and have a movable piston with
hydraulic fluid on both sides. Connected to this
piston is a ram or shaft that exits out of the other end
of the cylinder. Through the use of either a ball and
socket, a gear, or clevis and pin arrangement, the
ram is connected to a movable table surface.
The movable surface can be moved one way or
the other by pumping hydraulic fluid into the cylin-
der on either side of the piston. Obviously, if oil is
pumped into one side of the cylinder, a return path
must be provided for the oil on the other side. See
figure 1-9.
3. Kidney Lift Cylinders - The two kidney lift
cylinders are similar to the slide cylinder in that the
ram has rack gear teeth cut into the top surface. O-
Rings on each end of the ram allow the ram to also
serve as the pistons.
The rack teeth cut into the top of the ram meshes
with a pinion gear. This gear meshes with other
gears to supply the up or down drive for the kidney
lift bars, depending on which direction the oil is
pumped into the cylinder. See figure 1-11.
g. Hydraulic Cylinders (Slave Cylinders)
There are several different types of hydraulic cylin-
ders used in the table that activate the control
functions. With the exception of the elevation and
brake cylinders, all operate basically the same
way. The control functions are listed below: (See
figure 1-8.).
Trendelenburg--1, double action cylinder
Back Section--2, double action cylinders
Leg Section--2, double action cylinders
Slide--1, double action cylinder
Kidney Lift--2, double action cylinders
Lateral Tilt--1, double action cylinder
Elevation--1, single action cylinder
Brakes--4, single action cylinders
2. Slide Cylinder Assembly - This cylinder
arrangement has two pistons, one on each end of
a ram which has rack gear teeth cut into its top
surface. These teeth mesh with a gear arrange-
ment that drives a rack gear connected to the
bottom of the side frame.
When hydraulic fluid is pumped into one side of the
cylinder, the pistons are pushed in one direction,
the gear arrangement rotates and causes the table
top to slide. Oil pressure can be applied to either
piston, making the table slide end for end. See
figure 1-10.
Figure 1-8. Cylinder Placement
Figure 1-9. Back Section Cylinder
Figure 1-10. Slide Cylinder Assy.
BACK SECTION
CYLINDER
LEG SECTION
CYLINDER
SLIDE
CYLINDER
TRENDELENBURG
CYLINDER
ELEVATION
CYLINDER
KIDNEY LIFT
CYLINDER
LATERAL TILT
CYLINDER
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