50 $lb/in$ \begin{tikzpicture}[scale=0.5]
\draw[thick] (0,0) -- (10,0);
\draw[thick] (3,0) -- (3,-1) -- (4,-1) -- (4,0);
\draw[thick] (7,0) -- (7,-1) -- (8,-1) -- (8,0);
\draw[decorate,decoration={coil,aspect=0.4,segment length=2mm,amplitude=2mm}] (2.5,0) -- (2.5,-1);
\draw[decorate,decoration={coil,aspect=0.4,segment length=2mm,amplitude=2mm}] (3.5,0) -- (3.5,-1);
\draw[decorate,decoration={coil,aspect=0.4,segment length=2mm,amplitude=2mm}] (7.5,0) -- (7.5,-1);
\draw[<->] (9,0) -- (9,0.75);
\draw[<->] (9,0.75) -- (9,2.75);
\draw[<->] (9,2.75) -- (9,4.75);
\node at (10,0.375) {0.75 $in$};
\node at (10,1.75) {4 $in$};
\node at (10,3.75) {2 $in$};
\end{tikzpicture}
