PLATE THREE
INTERLOCKING MECHANISM FOR POWER OPERATED MUZZLE DOORS
The two diagrammatic views shown on this chart illustrate the
operation of the interlocking mechanism on submarine torpedo
tubes equipped with power operated muzzle door mechanism.
1. The interlocks proper are comprised essentially of pieces
B, C, E, F, I, N, O, P, Q, R, R1, T, W, and Y.
2. Interlocks B, E, R, and Y prevent the opening of the muzzle and breech doors at the same time. When the muzzle door
is open, the interlock sleeve (B) precludes raising the breech
and muzzle door interlock bolt (E) to free the breech door
locking ring (D). With the breech door unlocked, a lug on the
locking ring (D) obviates lowering the breech and muzzle door
interlock bolt (E) to release the slide (Y) on the control valve
operating handle. The hand shaft interlock (R1) is also held
engaged with the muzzle door hand shaft (U).
3. Interlocks B, F, R1, T and X prevent the opening of the
muzzle door and the drain valve at the same time. When the
muzzle door is open, the interlock sleeve (B) precludes raising the drain valve interlock head (F) to unlock the drain valve
through the interlock latch (T). If the drain valve is open,
the interlock latch (T) prevents lowering the drain valve interlock head (F) to release the interlock (X) on the control valve
operating handle. This restraint of the drain valve interlock
head (F) also holds the hand shaft interlock (R1) engaged
with the muzzle door hand operating shaft (U).
4. Interlocks B, C, I, N, P, Q, R and W prevent damaging
the torpedo tube by firing when the mechanisms are not properly set. To make the tube ready to fire, the rotating sleeve (N)
must be turned to align the hole in the shutter bar (I) with the
piston rod of the firing mechanism torpedo stop cylinder (J).
With the muzzle door closed, the interlock sleeve (B) obviates
this alignment of the hole in the shutter bar and the piston of
the torpedo stop cylinder by checking the firing interlock bolt
(C), which in turn restrains the rotating sleeve (N). When
the depth setting spindle is engaged, the interlock bolt (t) of
the depth setting mechanism prevents rotation of the rotating
sleeve (N). When the speed setting spindle is engaged, the
speed setting mechanism interlock bolt (Q) prevents rotation
of the rotating sleeve (N).
If the tube is ready to fire, the firing interlock bolt (C)
engages and locks the finger (W) on the control valve operating handle. The hand shaft interlock (R) prevents rotation
of the muzzle door hand operating shaft. The depth setting
mechanism interlock bolt (P) checks engagement of the depth
setting spindle, and the speed setting mechanism interlock bolt
(Q) checks engagement of the speed setting spindle.
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