Gas primed powder actuated tool
AssigneeOlin Corporation
InventorJack D. Dippold
Life of this patent
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Abstract
There is provided a powder actuated tool effective to drive a metallic fastener into a workpiece, for example, a nail gun. The pressure to drive the fastener is generated by combustion of an flammable propellant mix that is ignited by a primer flash. The primer flash having been generated by ignition of a combustible gas by discharge of an electric arc in the tool barrel. The combustible gas is lead-free such that the operator and the environment are not exposed to dangerous lead residue during use. The use of a solid propellant generates higher pressure and more effective driving of the metallic fastener than is achieved with powder actuated tools driven solely by combustible gases.
Claims20
An apparatus for driving a metallic article into a surface, comprising:
- a powder actuated tool having a barrel and intersecting handle, said barrel having an open, muzzle, end with a generally cylindrical interior bore extending therefrom, said generally cylindrical interior bore having respective first, second, and third diameter portions wherein
- said first diameter portion is adjacent to said open, muzzle, end and is effective to receive a work piston,
- said second diameter portion is in opposition to said open, muzzle, end and is effective to receive a cartridge containing a flammable propellant mix, and
- said third diameter portion has a diameter less than either of said respective first or second diameters and is disposed therebetween;
- a conduit extending through said barrel to said third diameter portion and being effective to deliver a combustible gas to said third diameter portion;
- and
- an ignition source within said third diameter portion.
An apparatus for driving a metallic article into a surface, comprising:
- a powder actuated tool having a barrel and intersecting handle, said barrel having an open, muzzle, end with a generally cylindrical interior bore extending therefrom, said generally cylindrical interior bore having respective first, second, and third diameter portions wherein
- said first diameter portion is adjacent to said open, muzzle, end and is effective to receive a work piston,
- said second diameter portion is in opposition to said open, muzzle, end and is effective to receive an electrically grounded metallic cartridge containing an explosive propellant mix, and
- said third diameter portion has a diameter less than either of said respective first or second diameters and is disposed therebetween;
- and
- an ignition source within said third diameter portion.
Dependencies are inferred from the claim text.