An Introduction to Machine Drawing and Design

by David Allan Low

Exercise 66: Locomotive Coupling Rod Ends.—A form of knuckle joint used on locomotive coupling rods is shown in fig. 64.

In this case two rods meet and work on the same pin, as shown at (a) fig. 64. Draw, in addition to the views shown in fig. 64, a plan and a vertical section through the axis of the pin. Scale 6 inches to a foot.

Would it be practicable to replace the two rods A B and B C by a single rod working on the crank pins at A, B, and C? Give reasons for your answer.

Fig. 64.

Exercise 67: Bell Crank Lever.—Draw the plan and elevation of the lever shown in fig. 65. Scale 6 inches to a foot.

Fig. 65.