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

260
The Trunk Upper Door
11. The trunk unloading aperture in the gun compartment
is fitted with a door hinged at the doorway sill. It opens
outward and down to form a transfer tray between the car and
the open projectile hoist cradle. The assembly as shown on
general arrangement drawings number 216459 and 216458 includes
the door, the door locking dogs, the door operating mechani sms,
and two selective mechanisms for operating the door locking
dogs.
12. The door is a rectangular panel of cast a.l.um.Lnum ,
It has integral hinge lugs on its lower edge and the periphery
of its inner face is fitted with an asbestos-metal-cloth-rub~
ber gasket which is secured by an aluminum retaining strip.
The outer face is fitted at seven points with bronz~ dog wedges.
An operating cylinder bearing located in offset position
on the outer face provides attachment for the piston rod of a
hydraulic door operating cylinder mechanism. A bronze door
frame riveted in the trunk door aperture provides hinge butts
and contact
respectively.
flange for the door hinge pins and door :gasket
13. The door locking arrangement comprises seven swinging
dogs which are simultaneously operated to lock or unlock
by a system of transmission rods. These are actuated by a
toggle and yoke linkage which is normally operated by a hydraulic
cylinder piston, but which may be alternatively operated
by an emergency hand crank mechanism. These devices are shown
on general arrangement drawing number 216459. Both dog locking
operating mechanisms are attachable to the toggle linkage
by a removable coupling pin. And both the piston and the hand
operated gear link are arranged to be secured in stowed positions
when either is uncoupled. .
14. The main toggle link of the dog locking toggle linkage
is provided with a latch lug. This lug engages a spring
loaded hook of an interlock hook and arm lever when the dogs
are in closed position. The arm of this lever projects into
the path of the car and is actuated to release the hook (and
the toggle linkage) when the ascending car is 2.5 inches from
its upper unloading position. The interlock hook and arm lever
when moving to unlatch the dog linkage operates an interlock
switch, designated "C" on figure_ 53. This is a normally closed
swLt ch which when open de-energizes an interlock solenoid to
prevent starting the hoist. See description paragraph 32.
15. The hydraulic control valve arrangements which control
operation of the door and dog locking power operated mech-