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Hydraulic Damping for Card Sleds

IP.com Disclosure Number: IPCOM000243889D
Publication Date: 2015-Oct-26
Document File: 4 page(s) / 149K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a device designed to minimize/mitigate connector wear in electron enclosures as a result of ship shock and vibrational environments through hydraulic damping. Hydraulic damping of card assemblies minimizes critical connector wear that will reduce the life of the system.

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Hydraulic Damping for Card Sleds

Disclosed is a device designed to minimize/mitigate connector wear in electron enclosures as a result of ship shock and vibrational environments.

It is common place for electronic enclosures to incorporate conveniently removable card assemblies to augment the main system, we can refer to these as card sleds. In order to maintain convenience for the insertion and removal of the secondary card assemblies it is commonplace to use a latching mechanism. The latched card sled assembly presents an issue specific to the shipping and handling of electronic enclosures. Shipping and handling can cause shock and vibrational environments that can result in wear on the connector that conjoins the removable card sled assembly with the main enclosure planer card assembly. The shipping shock and vibrations is often a result of rough handling or less than ideal shipping conditions, either way these are conditions that are often out of the control of the devise supplier. Therefore, the supplier must build in mitigation plans for such ship shock and vibrational environments to protect against connector wear. Connector wear results when the contacts from the two halves of the connector are allowed to rub against each other and wear through the conductive coatings such as gold. Over time connector wear can result in failure of the connector and thus system failure. The root cause of connector wear is a product of tolerances in the connector as well as tolerance in the system, which allows the connector contacts rub and wear. In order to mitigate connector wear, attempts are made to minimize the ability for the card sled to move within the bounds of the "latched" position.

Compliant Latches use spring metal cutouts to take tolerance out of the system as well as apply positive retention on the card sled. The compliant latches use a high spring force and resulted positive retention to combat vibrations but do not combat vibration with damping characteristics. Hydraulics would work in a similar way to remove tolerance from the system as well as apply positive retention force on the card sled. In addition to these factors hydraulics would also serve to dampen out vibration similar to the shocks that are used on a car. The damping effect reduces the relative motion of the card by converting the energy of the vibrating card sled to heat in the hydraulic liquid. Hydraulic damping could be realized in varies ways in this application, addressing vibrations in one or all three planes. One option would be to outfit a standard latch with a hydraulic plunger that when the card sled was inserted and latched the plunger would be activated applying a positive force as well as having the benefits of hydraulics in a vibrational environment. Another option would be to integrate the hydraulic damping capabilities into the connector guide pins. This approach would work in conjunction with common latching mechanisms to secure the card sled w...