Latch For PC Option Cards

Latch For PC Option Cards

   Locating and securing option cards in personal and other
computers usually involves the use of tools to fit retaining screws,
and can be difficult, particularly where space is constrained.

   The latching system described here provides a simple lever
which operates on a retaining pad to locate and secure the mounting
bracket of an option card, dispensing with the need for tools.

   All components of the improved latching system are
incorporated in a single moulding in a suitable thermoplastic such
as polypropylene.

   The pad is designed so that in conjunction with minor
modifications to the computer's chassis it will accurately locate and
retain the card bracket in position.

   The pad is connected to the lever via two semi-rigid
members and three flexible hinges and the lever is further attached
to the mounting bracket by another hinge.

   The mounting bracket is attached to the chassis by a pivot
pin that passes through a slot in the bracket.

   To fit a card first the blank card bracket must be
removed.  Then the new option card is fitted into place and finally
the new card's bracket is secured in position.

   To remove the blank card bracket the lever is pulled up and
the two semi-rigid members act as a over-centre type latch which
moves from the clamped to the unclamped position.  Once the latch
has moved past the unlatched position the pad is pulled clear of the
blank bracket by the continuing upward travel of the lever.  Once the
pad is clear the whole clip assembly can be moved until the pin
reaches the limit of its travel in the slot.  The clip assembly can
then be swung clear of the chassis to allow removal of the card blank
bracket and fitment of the new option card.

   The card is secured in position by reversing the
unclamping process.  The over-centre latch and the pad provide the
location and force required to retain the option card.

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