SteamVR with VIVE : How can I drag object only Y transformation?

Hello-

I'm trying to make a virtual reality game using vive controller and unity.

I already implemented function that can hold, drag, and throw the object using 'Fixedjoint' component. but I have some problem about dragging the drawer object.

When I hold and drag the drawer using controller, conflict occurs between drawer and desk that including drawer. It is because drawer's position is all changed (x, y and z all things).

So my question is:

How can I drag object only Y transformation even if position of Vive controller is changed all x, y ,z axis?

 private void GrabObject(){
     //1
     objectInHand = collidingObject;
     collidingObject = null;
 
     //2
     var joint = AddFixedJoint();
     joint.connectedBody = objectInHand.GetComponent<Rigidbody> ();
 }
 
 private FixedJoint AddFixedJoint(){ 
     FixedJoint fx = gameObject.AddComponent<FixedJoint> ();
     fx.breakForce = 20000000;
     fx.breakTorque = 20000000;
     return fx;
 }
 
 private void ReleaseObject()
 {
     if (GetComponent<FixedJoint> ()) {
 
     GetComponent<FixedJoint>().connectedBody = null;
     Destroy (GetComponent<FixedJoint> ());
 
     objectInHand.GetComponent<Rigidbody>().velocity = Controller.velocity*10;
     objectInHand.GetComponent<Rigidbody> ().angularVelocity = Controller.angularVelocity*10;
     }
 
     objectInHand = null;
 }