Load Arrestors for Falling Masses 2

[jktwn]

I need a device to arrest or catch a falling load of approximately 2000 lbs (similar to a fall arrestor for personnel safety). It should use an interia activated brake or catch mechanism like those found in automotive safety belt restraints. Does anyone know of such an animal?

 

[semer]

If you have had any luck finding such a device I would really be interested. I currently have an application where I could use it.

 

[jktwn]

From my research, I found only one company making such a device. I need a very fast response time for my application because I have to catch the falling mass within a span of only a couple of inches. I don't believe this device will work for me.

You can check it out at:

http://www.norguard.com/site/products/nor_3700300.html

Hope this is useful information.

 

[brakes]

I am a manufacturer of Linear Brakes that have a force capacity of up to 5500 Lbs., however it is a spring set/air release actuation so it may be more involved than what you are looking for as with the inertia activated system. Primarily used for machinery rather than a free hanging load so depending on your application...

 

[jktwn]

Brakes,
I am trying to catch a large rotating assembly in the event that the actuating hydraulic cylinder suffers a catastrophic failure allowing the mass to rotate with full force from the vertical to the horizontal position (90 degrees). The inertial activated brake sounded like a good idea because of its simplicity, unfortunately the response time is not very good. Since this is a safety device, it must be able to stop the falling mass in a hurry.

I am not sure how a linear brake would work in this arrangement but would like get some information on your device just in case.

Thanks

 

[brakes]

wxashcra,
We manufacture drum brakes and the linear brake can also operate on a disk (or partial disk for 90 degrees operation), so depending on your system's mech. design, inertia, stop time, etc., we may have a solution that could work for you. You would however, have to incorporate a way to sense a failure and have the control system respond (dump pressure to brake). The brakes have a quick response time (~65 msec.)and are failsafe in their operation so they are optimal for safety applications. Please visit our website:

http://www.holeindustries.com

for more info and feel free to contact us if you would like to discuss further.

Thanks

 

[Rnel]

wxashcra,
We manufacture seatbelts and use many acceleration sensative retractors. The important thing to determine if you are using a seat belt retractor is the acceleration rate at whih the internal mechanism will lock up. Most seat belt retractors that are mono-sensative (or sensative to acceleration of webbing despooling) are Federal Motor Vehicle Safety Standard (FMVSS) 209 compliant which regulates the sensativity and lock-up window of such retractors. This acceleration is regulated to be 0.7 g and the lock up window (the distance to be unspooled before lock-up) is also regulated. This entire standard is availible on the NHTSA website for free. Also, any seat belt retractor that is mono-sensative and certified to comply with FMVSS 209 will probably work in your application, they have a a 2500 lbf. minimum tensile strength requirement.
If you find FMVSS 209, look at requirements for an Emergeny Locking Retractor, mono-sensative. I hope this helps. If you care to contact me for more info, pleas feel free.

Rnel