The Norden Bomb Sight manual

J. Auto-

matic

Release

Mechan -

i sm

K. Teles-

cope

Quad-

rant

Drive

Assem-

bly

Fig. 34

This mechanism

in the sight is so set up that

a pair of contact points (knife type switch in the

M-3) will make contact when the trigger is pulled

up; wnen the rate and telescope quadrants indicat-

ors coincide.

The points are located on the rate

quadrant.

The movabie point has an extension

automatic release finger which rides on the tele-

scope quadrant.

when the trigger is pulled up,

sliding bar that covers the telescope quadrant

is

moved

out

of the way.

This allows the automatic

release finger to fall into a cut out portion

of

the telescope quadrant and permits the release

When the points contact,

the

current is transmitted to the bomb release mech-

anism located in the bombracks.

This assembly includes the following: dis-

placement knob, displacement clutch engaging knob,

displacement clutch bevel pinion, search

knob,

search knob bevel pinion, search knob bevel gear,

telescope rack drive gear,

telescope

rack,

tee

head

shaft, tee head telescope drive differential

gears

(upper traction gear, idler gears,

traction gear), intermediate gears,

roller carr-

lage, roller,

roller spline gear,

telescope quad-

rant

camway, cam follower or stud, and telescope

quadrant index.

The

telescope metor drives the disc which

drives the roller.

The roller spline gear drives

the intermediate

gears which drive the upper

traction

As the upper traction gear

turns

the idier gears will track around the lower tract-

ion gear provided

the displacement clutch is en-

gaged.

If the displacement

clutch

is not engaged

the pinion

gears

rotate

the lower traction

gear.

with

the displacement clutch engagedthe

pinion gears will track around the lower traction

gear ard

in so doing rotate the tee head shaft

which will rotate the telescope quadrant

rack

drive pinion and drive the telescope rack in trans-

lation.

The

follower, or stud on

the rack,

riding in

the

camway causes the telescope quadrant

to move in translation as the rack is driven.

The cam

follower,

riding in the

camway, gives

constant acceleration to the telescope quadrant

because as the quadrant moves toward minimum the

radius of angular movement of the quadrant becomes

and

shorter.

shor The displacement

knob enables the bombardier

to displace the optics faster or slower than the