a certain extent it continues pushing until the base 26 of the triangle has risen above the control surface 28 e the side 24 then starts to slide up along control surface 29 d and passing beyond the situation shown in fig4 e the control tappet 22 finally reaches the latching position on the angled projection 31 shown in fig4 f in this position shown in fig4 f the base body 21 of the fastening element 14 with the yoke 15 is in its parking position underneath the surface of the seat part 10 as can be seen in fig1 when the fastening element 14 is now to be moved out of its parking position and into the service position the yoke 15 is pushed down again against the force being exerted by the pressure storage mechanism 20 as this happens the side 25 of the control tappet 22 strikes the control surface 28 d of the control link 23 and slides down along it thus causing the retaining element 13 to slide further in the direction of the arrow 30 u2032 the tappet then breaks contact with the angled projection 31 completely this position is shown in fig4 g as a result of the further linear displacement of the control tappet 22 in the downward direction the lower tip of the tappet finally arrives in the second latching stage 19 accompanied by further displacement of the retaining element 13 toward the left so that it is now no longer possible to push the yoke 15 and thus the control tappet 22 down any farther against the force of the pressure.