Swench Wrench

[kxxr]

I've never seen one of these before. It is described as having a spring in the head that stores energy as it is turned and when released it delivers 500 ft/lbs torque on the small model. The big one can deliver 7000ft/lbs torque. They are very expensive when new, but there is one on ebay right now sitting at $76. I'll be watching to see what it goes for. I thought those of you who haven't seen one might find it interesting. Here are the pics from ebay item # 150999771027

[kxxr]

A couple more pictures (woops, double posted one of them:

[1930]

I like that clean design

[Plyerman]

Whoa, that thing looks pretty unusual. So it is not simply just a ratchet, but some sort of manual/spring-power driver?

[Ietech]

I've never seen one of these before. It is described as having a spring in the head that stores energy as it is turned and when released it delivers 500 ft/lbs torque on the small model. The big one can deliver 7000ft/lbs torque. They are very expensive when new, but there is one on ebay right now sitting at $76. I'll be watching to see what it goes for. I thought those of you who haven't seen one might find it interesting. Here are the pics from ebay item # 150999771027

Sounds like a very early type of impact wrench. Don't know if I would try tightening anything with it but it would sure give enoug impact to loosen a frozen nut/bolt. (OR Break it off)

[Bill Houghton]

7,000 foot pounds of torque?  You'd have to have a pretty firm grip on it when you released the energy.

[kxxr]

I don't know how it is designed but it does sound like quite a feat of engineering. No force is generated to the 'handle', only to the socket. There is a little bit more information here.
http://www.powerhawk.com/products_swench.html