Yes, they were file cabinets.  Apparently they work until they don't.  These cabinets worked fine for the better part of a decade (and had lots of heavy parts in the bottom) until they came spontaneously crashing down. 

I think the safest solution is securing large parts storage to the floors and/or walls, as described by Tom and Kieran. 

On Fri, Oct 30, 2015 at 12:12 PM, Kieran O'Neill <oneillkza@gmail.com> wrote:
I'd use concrete anchors and large-sized washers (I could see the
bolts pulling through the thin sheet metal otherwise).

Or you could stick all the parts in separate milk crates on more
stable, lower-level shelves...

On 30 October 2015 at 11:52, Thomas Martin <thomas.martin6@pcc.edu> wrote:
> Earthquake proofing them requires all shelving and cabinets to be strapped
> or otherwise secured to walls.
>
> Perhaps some plumbers tape would be a cheap solution.
>
> Tom
>
> Tom Martin
> Bike Program Coordinator
> Portland Community College- Cascade
> Cascade Alley
> Portland, OR 97217
>
>
> On Fri, Oct 30, 2015 at 11:40 AM, erk magosh <emailmyremail@gmail.com>
> wrote:
>>
>> Did it fall while top drawers were open? It's good to have cabinets that
>> only allow one drawer to be open at once.
>>
>> Also some are weighted at the bottom. You could add to this by putting
>> heavy parts on the bottom, reserving top draws for reflectors and other
>> light weight parts.
>>
>> File cabinets have worked for me, I've even used files in them to separate
>> parts it helps that only one of our drawers can open at a time keeping the
>> weight on the base of the cabinet.
>>
>> On Tue, Oct 27, 2015 at 2:28 PM, Angel York <aniola@gmail.com> wrote:
>>>
>>> From the minutes at my old bike collective, where they had been using
>>> double-wide filing cabinets as parts storage:
>>>
>>> Large parts filing cabinet fell suddenly and catastrophically, no
>>> injuries, single most dangerous thing to happen in shop history, we are very
>>> fortunate.
>>> We CANNOT use double-wide cabinets ever again, they are too potentially
>>> dangerous the way we use them.
>>>
>>> Beware of storing parts in any kind of drawers that could be top-heavy.
>>> After years of working just fine, they could spontaneously come crashing to
>>> the floor.
>>>
>>>
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