Bolzenschubwerkzeuge – indirect acting actuated fastening system

Powder actuated fastening systems

Two types of tools have been used in the market which operate on different driving principles, direct acting and indirect acting.

While the direct acting principle may allow fastenings to be made
in very dense concrete and thick steel base materials, safety concerns have made the indirect principle the technology of choice.
Powder actuated tools using this principle are no longer commercially available.

In a tool which operates using the indirect acting principle, the
expanding gases of the ignited powder load act directly on a
captive piston which is housed within the barrel of the tool.

All Powers' powder actuated tools operate using the indirect acting principle and are classified as low velocity tools.

http://www.powers.com/pdfs/general_selection_guides/powder_g...


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Note added at 4 hrs (2006-12-18 04:35:22 GMT)
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Or low-velocity powder-actuated tool

Unlike firearms, however, most powder-actuated tools in use today are considered to be low-velocity, which means that the explosion of the charge does not act directly upon the fastener (as it does on the projectile in a firearm). Instead, powder-actuated tools employ a piston positioned between the firing chamber and the fastener that transfers the force of the explosion and strikes the head of the fastener.

http://en.wikipedia.org/wiki/Powder-actuated