Machine drawing; a text and problem book for technical students and draftsmen (1921)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 91
Fig. 150. Levers and Handles. The length of a lever is from center to center of holes or an equivalentdistance as illustrated. The three classes of levers are shown in Fig. 151. In each case the Shaft Le^^er of 1st Class PL, = WL2 ,. Ppull k p Ley^er of 2nd Class -Lr w PL. = WL- W -Lz- -Ap Leyer of… … Fig. 152. Bell Cranks and Bent Lever. MACHINE DETAILS 81 When the load and force act at an angle some form of bell crank is used,Fig. 152. Bent levers are used when it is necessary to avoid a stationary-part as shown. The length of a bent lever is the shortest distance be-tween the two centers.…
Machinery
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