A Text Book on Engineering Graphics - Central Board of Secondary ...
A Text Book on Engineering Graphics - Central Board of Secondary ... A Text Book on Engineering Graphics - Central Board of Secondary ...
GIB AND COTTER JOINT 128 ROD JOINTS This joint is used to join two rods of square or rectangular in cross section. The end of one rod is forged in the from of a fork or strap. The height of the other rod is increased for compensating the loss of material in making the slot for cotter. The Gib is made up of mild steel and has the same thickness as that of the cotter. the Gib has projections at the top and bottom ends which act like hooks. While connecting two rods the Gib is inserted first and pushed towards the end of the fork and then the cotter is hammered over. The tapering sides of the Gib and the cotter mate with each other, while their outer sides are parallel to each and perpendicular to the common axis of the rods. Hence, when a Gib is used with a cotter, the opposite faces of the slots in the rods are parallel to each other. The Gib acts like a counter part of the socket/strap. The Gib increases the tearing area of the cotter and prevents slackening of the joint besides holding the jaws of the strap or fork from opening wide when the cotter is inserted. The use of Gib and Cotter enables the parallel holes to be used. When Gib is used the taper is provided in the Gib. This joint is useful to fasten connecting rod of a steam engine or marine engine. TAPER ON THIS SIDE GIB EYE END Fig. 4.24 COTTER RECTANGULAR SLOT FORK END GIB ROD END Fig. 4.25 COTTER FORK SECTIONAL VIEW OF GIB AND COTTER JOINT FORK END ENGINEERING GRAPHICS
ROD JOINTS Dimensions of a Gib and Cotter Joint in terms of the side (s) of the rods to be connected. Question: SQ30 R5 EYE END GIB A F 20 SQ S 0.36B B/4 A B Fig. 4.26 The figure 4.27 shows the exploded pictorial View of a Gib and Cotter Joint. Assemble these parts correctly and then draw the following views to scale 1:1. (a) Front View, full in section (b) Right side view (c) Top view. L M Z C D COTTER FRONT VIEW FULL IN SECTION GIB AND COTTER JOINT FOR SQUARE RODS Print title and scale used. Give six important dimensions. B 10 27 112 30 35 35 R5 10 10 30 Y = 3mm X TOP VIEW 50 FORK END 0.3S SQ30 A=C=D=0.75S B=1.3S L=0.55B M=0.45B ENGINEERING GRAPHICS 129 SQ S SQ S 2S CLEARANCE X,Y AND Z = 3mm TAPER 1:20 10 53 53 20 Fig : 4.27 H H L=3.5S LEFT SIDE VIEW C 12 10 10 50 76 TAPER ON THIS SIDE DETAILS OF GIB AND COTTER JOINT
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ROD JOINTS<br />
Dimensi<strong>on</strong>s <strong>of</strong> a Gib and Cotter Joint in terms <strong>of</strong> the side (s) <strong>of</strong> the rods to be c<strong>on</strong>nected.<br />
Questi<strong>on</strong>:<br />
SQ30<br />
R5<br />
EYE END GIB<br />
A<br />
F<br />
20<br />
SQ S<br />
0.36B<br />
B/4<br />
A B<br />
Fig. 4.26<br />
The figure 4.27 shows the exploded pictorial View <strong>of</strong> a Gib and Cotter Joint.<br />
Assemble these parts correctly and then draw the following views to scale 1:1.<br />
(a) Fr<strong>on</strong>t View, full in secti<strong>on</strong><br />
(b) Right side view<br />
(c) Top view.<br />
L M<br />
Z<br />
C D<br />
COTTER<br />
FRONT VIEW FULL IN SECTION<br />
GIB AND COTTER JOINT FOR SQUARE RODS<br />
Print title and scale used. Give six important dimensi<strong>on</strong>s.<br />
B<br />
10<br />
27<br />
112<br />
30 35<br />
35<br />
R5<br />
10<br />
10<br />
30<br />
Y = 3mm<br />
X<br />
TOP VIEW<br />
50<br />
FORK END<br />
0.3S<br />
SQ30<br />
A=C=D=0.75S<br />
B=1.3S<br />
L=0.55B<br />
M=0.45B<br />
ENGINEERING GRAPHICS 129<br />
SQ S<br />
SQ S<br />
2S<br />
CLEARANCE X,Y AND Z = 3mm<br />
TAPER 1:20<br />
10<br />
53<br />
53<br />
20<br />
Fig : 4.27<br />
H<br />
H<br />
L=3.5S<br />
LEFT SIDE VIEW<br />
C<br />
12<br />
10<br />
10<br />
50<br />
76<br />
TAPER ON THIS SIDE<br />
DETAILS OF GIB AND COTTER JOINT
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