Patent ID: RE40055

Claim:
A positioning unit for an electronic device having first and second housings pivoted to each other, said positioning unit comprising: a catch member adapted to be mounted movably in the first housing, and having a front end that defines a gap having a width which is reducible when said catch member is moved in a transverse direction from a non-catching position to a catching position and which is expandable when said catch member is moved from the catching position to the non-catching position; and a locking member adapted to be mounted movably on an exterior of the first housing and having an engaging end that extends into said gap and a retaining element that is adapted to releasably engage the second housing , said locking member being operable for moving said catch member from the non-catching position to the catching position when an external force is applied to said locking member, said locking member being movable together with said catch member in the transverse direction from an engaging position, in which, said catch member is moved to the catching position, and said engaging end engages said front end of said catch member by virtue of reduction of the width of said gap , and said retaining element is adapted to releasably engage the second housing so as to lock the second housing to a disengaging position, in which, said catch member is moved to the non-catching position, said engaging end disengages from said front end of said catch member by virtue of expansion of the width of said gap, and said retaining element is adapted to disengage from the second housing so as to unlock the second housing .