Box Collider wont trigger a Trigger after moveing the object

im doing some movement with the elevator this way, this script is attached in the player:

 var pos : int = 0;
 function Update(){
     var hit : RaycastHit;
     if (Physics.Raycast (transform.position, -Vector3.up, hit, 100.0)) {
         if(hit.collider.gameObject.tag == "Elevator"){
            if(pos == 0)
                hit.collider.transform.position += Vector3.right * Time.deltaTime * vel;
            else if(pos == 1)
                hit.collider.transform.position += -Vector3.right * Time.deltaTime * vel;
         }
     }
 }

and i have a trigger where is supposed to stop this movement and change the var 'pos' to 1, but the plataform wont activate the trigger, the player does though.