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Cam Actuated Mechanism to Limit Overhead Access to Hazardous Components Disclosure Number: IPCOM000246447D
Publication Date: 2016-Jun-07
Document File: 8 page(s) / 270K

Publishing Venue

The Prior Art Database


Disclosed is a device that prevents a user from accessing hazardous energy in a system during service, requires the installation of air baffles after service to ensure proper thermal performance of a system, and requires covers to be reinstalled in a proper order after service. This device performs these tasks more efficiently and more cost effectively than other methods, such as electronic circuits and elaborate mechanical interlocks

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Cam Actuated Mechanism to Limit Overhead Access to Hazardous Components

When service personnel access a system for replacing components, they need to be kept safe from hazardous energy. This can be done in a variety of ways, from electromechanical interlock switches to mechanical impediments keeping the system from being reinstalled without the proper shields. Electromechanical interlock switches often have reliability issues and introduce the need for electronic circuits be added to the system. This adds cost to the product. Another way is to implement 240VA circuits on the card or to redesign the power system to ensure that no energy is above the safety limit. This adds complexity and cost to the design and, in some cases, this cannot be implemented due to the system architecture. There is a desire to design an inexpensive, yet reliable mechanism to keep the service personnel safe from hazardous energy when servicing a server.

    When a service person completes a service action, it's important that all components be reinstalled into the system for it to function as intended. It is possible that covers and/or air baffles that need to be removed during service could be accidentally left un-installed by the service person. If these covers and/or air baffles cannot be designed so it remains captive when in a service position, there is a need to make it impossible for the system to be returned to normal use unless it is reinstalled.

    This invention accomplished three tasks with the same part:
1 - Prevents a user from plugging in a system into an enclosure without the proper safety shields that block body access to hazardous energy (240VA). While the system is unplugged from the system, there is no power to the device, so no hazardous energy is present.
2 - Requires the user to reinstall the air baffles (covers) onto the system before plugging it into the enclosure. Not reinstalling these pieces would lead to detrimental thermal impacts.

3 - Prevents the user from re-installing the covers in the improper order. This eliminates the risk of one or more covers being left off the system and eliminates exposure to thermal or hazardous energy (240 VA concerns).

    This invention implements a spring/cam assembly in the chassis and the SSD cage (or filler cover). These parts work in conjunction with the existing ITE rear cover interlock to accomplish these tasks. In this implementation, the HDD/SSD cage (or filler cover, depending on system configuration) needs to be removable to service components below the cage. To remove the cage, the rear cover needs to be removed to allow the HDD/SSD cage to slide out of the system. Figure 1 below shows the system assembled:


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Figure 2 below shows the rear cover removed to allow the HDD/SSD cage to be removed, and Figure 3 below shows the HDD/SSD cage removed so that the components below it can be accessed for service.



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To remove the SSD cage, a spring latch...