Re: Brake method needed for hillside lift

["Robert L Bass" <robertbass1@xxxxxxxxxxx>]

This might be a bit complicated, but a centrifugal brake should do the job.  Ideally, the brake engages if the drum starts spinning.
As the brake slows the drum, it eases up a bit, allowing a safe descent.  ISTR they use something like this on the tram at a ski
lodge in NH.

Thinking it up was easy.  Engineering it is outside my skill set.  :^)

--

Regards,
Robert L Bass

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Bass Home Electronics
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<astutesolutions@xxxxxxxxxxxxx> wrote in message news:1162081082.435352.232820@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Gemini wrote:
>> The simplest way would be to wrap and connect the cable to (a spring
>> loaded?) spool under the carriage that would allow a lever to drop down on
>> some type of stops affixed to the tracks so that if the cable ever became
>> slack it would drop down and engage on one of the stops.
>> I remember this method being used on larger garage doors as a safety in case
>> the counterbalance failed.
>> Let me know if this makes no sense verbally and I'll sketch it out for
>> you....
>>
>
> Yes, this makes sense but the only problem is detecting the slack.
> Since the angle is 30 degrees and travels about 150 feet, the cable
> naturally has slack when going down.  It rests on the support a bit as
> the cart pulls it down.  Also, in a freespool event where the cable
> drums are moving freely, there wouldn't be enough slack to react on.
>
> One one of the other boards (comp.home.automation) a suggestion was
> made to hook up the drums to an air compressor (without the electric
> motor) such that it would have resistance at higher speeds.
>
> Thanks for the suggestion!
>