A Text Book on Engineering Graphics - Central Board of Secondary ...

SHAFT COUPLINGS
Exercise 6.1
Fig 6.10 shows details of an unprotected Flange Coupling. This figure shows one view, each
of the part no. 1, 2 and 3 and two views of part no.4. Draw to a scale 1:1, the following
orthographic views.
a. Elevation, upper half in section
b. Right hand side view, without section.
Show the dimensions properly. Print title and scale used and draw the projection symbol.
Ø 170
Ø 90
120
DETAILS OF AN UNPROTECTED FLANGE COUPLING
6.1.2 Protected Flange Coupling
5
FLANGE (2 OFF)
Ø 240
Ø 310
Ø 180
3
35 35
Ø 20
120
Fig 6.10
We know, the pervious type of flange coupling (Unprotected) has a shortcoming which is
overcome in this type of Flange Coupling. To do so, we need to shield/cover the protruding
nuts or bolt heads. And this can be done by slightly altering the shape of the flanges. So the
flanges have a flared and flattened rim i.e. a projected outer ring (shroud) as shown in the
figure. This overhangs over the bolt heads and nuts and thus minimizes accidents and
ensures safety, Hence it is named as a 'Protected Flange Coupling'.
ENGINEERING GRAPHICS 157
Ø 90
95
HEX. HEADED BOLT AND NUT
M20X2.5 (4 OFF)
SHAFT (2 OFF)
KEY
L
W
T
W=25
T=15
L=130
(2 OFF)