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Engine mounting and energy absorbing frame for a motor vehicle
US 3869017 A
http://www.google.com/patents/US3869017

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#3-Breakaway Motor Mounts-These mounts attach the engine to the frame of the car. They're not noticeable, but the life saving impact is huge. In a front impact collision, they're specifically designed to break the engine away from the frame and with the forward motion, will make the engine slide underneath the car at a 45 degree angle. Making it less likely to have an engine sitting in your lap when the crash comes to a halt.
Article Source: http://EzineArticles.com/1073393

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http://wiki.answers.com/Q/What_is_a_Volvo_..._mount?#slide=1

Possibility?