  We study the strong interactions among the heavy bottom spin--1/2 $\Sigma_b$
baryon, nucleon and $B$ meson as well as the heavy charmed spin--1/2 $\Sigma_c$
baryon, nucleon and $D$ meson in the context of QCD sum rules. We calculate the
corresponding strong coupling form factors defining these vertices by using a
three point correlation function. We obtain the numerical values of the
corresponding strong coupling constants via the most prominent structure
entering the calculations.
