In the process of designing a mechanism of a tripod access control device we were confronted with two problems. First, it was required to determine the appropriate force for the solenoid actuator as well as search for any potential critical tension in the revolver. We obtained the results by using an analitical calculation and numerical simulations. As a result of conducting the prototype tests our calculations were verified and the final design of the mechanism bars and ratchet was confirmed. However, the calculations and simulations exhibited a better suitability of the second concept that does not require an additional approach regarding the contact surface treatment of the bars and ratchet, for the desired friction coeficient to be smaller than or equal 0,2.