can anyone help me with equip/unequip a wepon?

hi guys please help me , i have a player when i press E key he equip the the weapon ,but i want when i press E key again yo unequip the weapon , and the weapon return to its original position on player "left upleg"

this is my script; using UnityEngine; using System.Collections;

public class WieldWeapon : MonoBehaviour {

 Animator anim;
 public GameObject sword;

public GameObject hand; void Start() {

     anim = GetComponent<Animator>();

 }

 void Update()

{

     if (Input.GetKeyDown(KeyCode.E))
     {
         anim.SetTrigger("Draw");
         sword.transform.parent = hand.transform; //Parenting this item to the hand bone position
         sword.transform.localPosition = new Vector3(0.1170032f, -0.1580014f, 0.07697155f); // centering the sword handle
         sword.transform.localRotation = Quaternion.identity; //must point y local, so reset rotation
         sword.transform.localRotation = Quaternion.Euler(38.68549f, 13.8611f, 104.8913f); //and rotate the sword accordingly
     }

     

}

}