OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

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44 . Sate t y car S top r e lea s e ua t v e . - L0 cat ed at the
hoist operator's station is a small separate assembly, which
functions to start the cycle, and to withdraw the safety car
stop device from the path of the powder car. It is connected
to the rest of the equipment by copper tubing. The assembly
consists of a steel valve in a cast bronze housing. The valve
is linked to a starting handle, assembled to a cover on the
body • At the other end of the body is located a bracket, to
which is secured an electrical switch. Whenthe starting handle
is moved to the IlStart" position, the valve is shifted and
in turn closes the switch to start the cycle. The valve is
spring operated to return to the IlStop" position, when the
starting handle is released. Drawing number 274260 shows the
arrangement of this valve unit.
45. Latch and vent valve. - The latch and vent valve
functions only during a "Mechanical" controlled cycle. It is
connected to the control selector linkage. The latch is mechanically
held out of the notch on the Gam when the controls are
set for "Servo E'Lec t.r-Lc aL" operation. The assembly consists
of a steel valve in a cast bronze housing. The valve is pressure
operated to withdraw the latch and is spring and pressure
operated to return the ·latch. The valve is used to vent the
main circuit during a llMechanical" controlled cycle, and also
allows the brake to apply. The latch is use~ to prevent the
moving of the operator's control lever, until the starting
valve is moved to the "Start" position. This prevents the
powder car being lowered inadvertently on to the safety car
stop device. Drawing number 274263 shows the arrangement of
this unit which is located forward, adjacent to the A-end.
46. safety car stop device. - The safety car stop device
consists of a steel housing and a steel pluhger with oil seals.
This plunger is attached to a lever, which is assembled to the
control shaft and linkage. The unit operates a pair of safety
car stop device latches which are mounted on free bearings in
the trunk below the upper door. The latch is in the path of
the powder car, when the car is at either the upper or lower
unloading station. The latch is withdrawn hydraulically when
the starting handle is moved to the "Start" position, but after
the car has moved a few inches, the starting handle is released,
and the latch is spring operated to return into the path of
the powder car. This latch prevents the powder car from falling
from either unloading station in event of cable breakage.
Drawing number 274258 shows the design of this hydraulic device.
47. Control linkage. - Drawing number 274251 shows the
control linkage elements that are located forward of the hoist
trunk and provide interconnection between the A-end controls
and the control lever control shaft. The linkage consists of
a steel bracket and shaft, to which are secured levers and