Browse Prior Art Database

Printed Circuit Board Insertion/Extraction Mechanisms

IP.com Disclosure Number: IPCOM000112402D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 114K

Publishing Venue

IBM

Related People

Boswell, G: AUTHOR [+4]

Abstract

Disclosed is a mechanism that provides leverage to insert a card into a mating connector. The amount of leverage available is sufficient to overcome the high frictional forces of the mating connectors for both insertion and extraction. The mechanism is linked to provide a parallel force arrangement via two cams in order to seat the mating connectors squarely. A two lever configuration is for hand operation to insert a card with an alternative configuration for a single lever operation. The mechanism also includes a positive stop for the card to be positioned prior to operating the handle and engaging the two connectors. The lever arms give a mechanical advantage large enough to force and mate the connectors. The device can be used in a confined space with limited access.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Printed Circuit Board Insertion/Extraction Mechanisms

      Disclosed is a mechanism that provides leverage to insert a
card into a mating connector.   The amount of leverage available is
sufficient to overcome the high frictional forces of the mating
connectors for both insertion and extraction.   The mechanism is
linked to provide a parallel force arrangement via two cams in order
to seat the mating connectors squarely.   A two lever configuration
is for hand operation to insert a card with an alternative
configuration for a single lever operation.  The mechanism also
includes a positive stop for the card to be positioned prior to
operating the handle and engaging the two connectors.  The lever arms
give a mechanical advantage large enough to force and mate the
connectors.   The device can be used in a confined space with limited
access.  A board alignment method is included at end of this
Technical Disclosure.

      A printed circuit board assembly has a large number of pins on
its auto plugging connector which result in a high
insertion/extraction force.   Access to this board is restricted so a
mechanism to aid insertion and extraction has been devised which
consists of a linked dual camming arrangement with two handle/levers
operated simultaneously.

      Fig. 1 shows a plan view of a PCB (1) and its associated guides
(2) together with a mother board (3) into which it plugs.   The PCB

(1) and mother board (3) have multi-pinned self aligning connectors
(4) and (5) which carry signals and power from one to the other.
The guides (2) and mother board (3) are fixed to the supporting
chassis of the unit.   Items (6) and (7) are handle/levers shown in
the inserted position with links (8) and (9) in conjunction with (10)
controlling the synchronized action of (6) and (7); a crank (10) is
pivoted at (11) and supported by lugs on the PCB front plate (12).

      Fig. 2 shows one side of the mechanism with some supporting
parts omitted for clarity.   The handle/lever (6) is supported by and
pivots on Block 13 which is part of the PCB front plate (12).  An
extension of the lever forms the cam plate (14) pivoted on which is
link (8).   The cam plate (14) is designed to stop the insertion of
the PCB before the connector contacts make.   The stop action occurs
when lug (15) meets the cam block (16).   Cam block (16) is fixed to
the guides (2) and to the supporting chassis of the unit.   All
features described so far are mirrored on the left hand side of the
PCB.  Upon insertion, the PCB slides in the guides (2) until the
stops (15) meet the...