Section 4401. Motion for judgment during trial

Any party may move for
  judgment with respect to a cause of action or issue upon the ground that
  the moving party is entitled to judgment as a matter of law,  after  the
  close  of  the  evidence  presented by an opposing party with respect to
  such cause of  action  or  issue,  or  at  any  time  on  the  basis  of
  admissions.  Grounds  for the motion shall be specified. The motion does
  not waive the right to trial by jury or to present further evidence even
  where it is made by all parties.