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

239
Cradle Operating Mechanism
21. The cradle operating power plants are located benea
th the shelf plate to the rear of the gun pockets. The hydra~lic
power derived from these units is used to operate the
cradle and also to actuate hydraulic devices which make the
hoist reversible. The cradle operating unit (par. 24) is 10cated
in the gun compartment to the rear of the cradle with
mounting bracket secured to the shelf plate. The other devices
(pawl operating cylinders) are mounted on the hoist tube in
the electric deck space. Each cradle operating assembly comprises
an electric motor, a pump, a cradle operating cylinder,
a control valve and a pipe system with expansion and supply
tanks. The arrangement is shown on drawing number 236513 for
a right assembly, left and center are similar.
22. Electric motor. (Cradle operating system.)- The
electric motor is a ten horsepower unit of commercial manufacture
(Louis-Allis Co.). It is mounted with rotor shaft vertical
and with direct drive coupling to pumps at each end. The
upper pump is the operating unit for the cradle mechanism; the
lower pump is arranged in a system which operates the upper
door of the powder hoist (see ch . XII). The motor controller,
an across-the~line magnetic starter.with conventional protection,
is arranged with starting circuit push-button station
located at the cradle operatorts station.
Motor Data
Type- - - - ~ 60 cycle, 440 volt, 3 phase, squirrel
cage induction, vertical.
Horsepower- - - - - - - - - - - - - - - - - 10
Speed - - - - - - - - - - - - - - -Constant
R.P.M., full load - - - - - - - - - - 1160
Amperes, full load- - ~ - - - - - 26.5
Rotation, from above- - - - - Clockwise
Lubrication - - - - - - - - - - - - - - grease cups
Manufacturer's type designation - - - - - RX-326~W
General arrangement drawing - - - - 231764
23. Pump .. - The pump is a rotary multiple vane type
(Vickerts) of 30 gallon per minute capacity. It is driven at
motor shaft speed and supplies oil at intermittent, varying
pressures accordi.ng to the relief valve and circui t arrangements
described in paragraph 26. This pump functions not only to
operate the cradle through the cylinder descr1bed in the following
paragraph but also supplies pressure for operating the
pawl control mechanisms described in paragraphs 27 to 33.
24. Cradle operating cylinder. - The cradle operating
cylinder is a hydraulic ram subassembly. The design arrange-