I'm afraid I can't be of much help, here's all I've got. For whatever it's worth here's the full text of the Packard patent covering this device. Keep in mind that a skillful patent attorney tries not to disclose his "best" or preferred methodology, but tries to write his claims so as to embrace it. Point being, what's disclosed isn't necessarily what's actually built.
If you go over to the PAC website at
http://www.packardclub.org/forum/viewtopic.php?f=5&t=696 which should be the Redding CT show last Saturday, there is a photo of a double-acting trunk rack on a 1937 Super Eight convertible sedan. Unfortunately the photo doesn't show much, and even examining it closely I wasn't able to form a clear picture in my mind of how it functions. But note the knurled locking knob on the right side of the rack rear. I think I have one more detail picture that I didn't post on that site; if I saved it I'll add it here.
Sorry I don't have more.
PS - found the other photo.
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