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

263
safety latches are spring loaded pawls which are mounted on
the inner face of the hoist trunk and have free movement on
their respective shaft bearings. They are retractable (to
permi t the car to descend) through hydraulic control circuit
arrangements described in paragraphs 49 to 69. An al ternati ve
foot pedal mechanism for retraction of the latches in emergency
(power failure) is located as shown on drawing number 233133.
The latch position in the trunk is shown on general arrangement
drawing number 216459.
22. The cam bracket location on the car and its functional
purpose is described in paragraph 9.
23. The upper door dog interlock trip pawl is located
on the rear side of the car at the top. (See dr. no. 216452.)
It functions to unlatch the hook described in paragraph 14.
24. The switch operating bar is located on the forward
side of the car. It is a vertically positioned subassembly
which includes two adjustable trip brackets. These are limit
switch actuating elements which have fixed position (after· adjustment)
and operate together ~ith limit swit~hes at top and
bottom to control the stopping positions (servo control) of
the car at loading and upper and lower unloading positions.
Their adjustment for correct cam lever contact (which throws
the limit switches) is as shown on drawings number 233136 and
233137. The control performance provided is described in paragraphs
49-69 (refer switches 7, 8 and 9).
25. A trip cam (234051-13 or 14) on the rear side of
the car is one of the actuating elements of the lower door,
car and control lever mechanical interlock. See description
of the If Control Lever Interlock," paragraphs 30 and 31.
Hoist Rope
26. The car is raised from the loading station to the
upper unloading station by means of a five-eighths inch diameter
wire rope, a sheave under the turret top plate, and a
hoist drum driven by a hydraulic transmission and electric
motor. The car is lowered by gravity (there is no downhaul).
From the single sheave (a 15-inch diameter wheel) the rope extends
forward to the hoist machine through a hollow bronze
rope guard. This guard is mounted in the front plate of the
hoist trunk. The hoist machine is located next to the hoist
trunk within the box gun girder.
Car Buffers
27. At top and bottom of the hoist trunk an installa tion
of car buffers provides emergency stopping devices todeceler-