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

348
holder except that there is provision for the telescope to rotate
within the holder about its longitudinal axis. This rotation
is limited by two bumpers mounted on the holder. The
telescope can be locked agains t rotation rela ti ve to the holder
by a locking pin mounted on the holder cap. The holder is
pinion and sector connected to the deflection worm wheel shaft,
is supported by the elevation bracket, and provides ball bearing
mount for the telescope (line of sight elevating movement).
28. The elevation bracket is similar to that of the
pointer's station, there being only a slight difference in the
shape of the arm skirts and length of the shaft portion of the
bracket. The skirt is cut away to allow for motion of the
telescope in elevation independent of the elevation bracket
motion.
29. The deflection pinion and sector, sight deflection
worm whee l, and s ig tit: e t evat i on arc are identical in every
respect to the same parts on the pointer's station. However,
th~ sight deflection and elevation worms differ in that the
deflection worm, 231647-3, is made separate from the shaft
while the elevation worm, 231669-6, differs in minor details
of the shaft. .
30. The compensating differential and spur gear train
function to compensate for the deflection of the telescope due
to planetary action of the telescope holder deflection sector
and pinion. This arrangement, drawing nllmber 231160, is made
up so that the worm shaft bevel gear meshes with two spider
mounted idler bevel gears; the spider mounted idler bevel gears
mesh with a rivet joined spur bevel gear; this in turn meshes
with the idler spur gear and elevation shaft spur gear. The
spider is splined to a bevel gear which meshes with a bevel
gear on the deflection input shaft. .
31. The ti aruiuitie e t and order shaft gearing, enclosed and
supported by the cast phosphor bronze handwheel bracket, connects
the handwheels to the train order shaft. This gear system
.Ls simply two sets of bevel gears with a handwheel and
connecting shaft ball bearing mounted on the handwheel bracket.
32. The housing cap, housing, housing support, pedestal,
and shaft guard function to support and enclose the various
elements of the trainer's station, synchr onLzLng clutch, and
sight setter's indica tor. With the exception of the shaft
guard, which is a bronze ~asting, these parts are steel castings
arranged in the order mentioned from top to bottom of the
trainer's station. The shaft guard fastens to the housing
and also to the pedestal by means of a bracket. Also fastened
on the pedestal are the seat pedestal and foot rests.