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

244
29. Tube pawl control mechanism. - Tube pawls have
splined mounting on horizontal shafts which have bearings in
the respective housings. Each pawl shaft is fitted with a
crank which is connected to a system of control rods. The latter
extends to the piston of a tube pawl operating cylinder IIJII
(see par. 31). This cylinder is loca ted on the tube immediately
adjacent to the upper pawl.
30. Rack pawl tripping cam mechanism. - When the rack
is at the bottom of its stroke the three upper rack pawls are
aligned with tripping cams (attached to the rack casing). These
are arranged to be simultaneously actuated by a system of rods
that extends to the piston of a rack pawl operating cylinder ItH"
(see par. 31). This cylinder is located adjacent to the tube
pawl operating cylinder. The tripping cam action is such that
it will retain the pawls in retracted position until each pawl
on the upward moving rack is past the base of a projectile on
the stage above. (See fig. 47.)
M G Y E D B
SUPPL't
TANK
•• !~===::J:b=====:clb=====:::J
• i
• I'
. ~ II
LOWER
lEGE:NO
MAIN SYSf(r>I'·
A-[NODlSPL4CEhlENT _
P(TUR"I FI.OII'(A-ENO SUCTIONL ~
CRAOt.( "Na P"WI. 5'151['"
P/Jlllt OP[R,UtNG STSTEM P••t~S;;Rf .IK::lK:::U ..•• ".l
suPPlY T.I./III( I1£:4.D. ~
CRADLE
CYLINDER
Fig. 47 - Lowering Projectiles.
Raising Empty Rack. Cradle Closed.
Rack pawl control set to trip.
SUPPLY
TANK
HOIST
CYLINDER
F
Z
P
H