gears_simple+foreach.tex

\documentclass[border=3mm,tikz]{standalone}
%\documentclass[11pt]{scrartcl}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
	\draw[thick]
	\foreach \i in {1,2,...,10} {%
		[rotate=(\i-1)*36] 
		(0:2)  arc (0:18:2) {[rounded corners=2pt] -- ++(18: 0.3)  arc (18:36:2.3) } -- ++(36: -0.3) 
	};
\end{tikzpicture}
\end{document}