Patent ID: 7350265
Filing Date: 2008-04-01
Classification: B08B,E03C

Abstract:
1. A self-contained handheld drain clearing compressed air device comprising: (a) a handle assembly including a compression chamber, said compression chamber having a first end, a second end, and an interior area bounded by said first end and said second end, a one-way air inlet valve positioned at said second end, a pump rod sealingly and slidably positioned within said interior area, said pump rod extending through said first end of said compression chamber, said pump rod having two ends, one end of said pump rod coupled to a pump handle, the other end of said pump rod coupled to a plunger; (b) a trigger component having an inner mechanism and an exterior handle, said inner mechanism consisting of a trigger piston, a trigger spring, a cushion, a seal packing ring, and a needle valve, said exterior handle connected to said handle assembly by a pin, said exterior handle having a first position and a second position, said first position consisting of the exterior handle being uncontacted with said trigger piston, said second position consisting of the exterior handle being in contact with said trigger piston; (c) safety means for releasing pressure, said safety means externally fixed beyond said second end of said compression chamber; (d) a compressed air collection chamber positioned inwardly from said trigger component and below said second end of said compression chamber, said compressed air collection chamber having an open end, a closed end, and a piston removably positioned within said compressed air collection chamber, said piston having an open end, a closed end, and an air outlet hole positioned towards said closed end; (e) a compressed air storage chamber having a first end containing external threads for combining with said handle assembly, a second end containing a drain-sealing adapter fitting, a centrally located compressed air discharge passage, a sealing nut cap positioned over said compressed air discharge passage, and a fixed locking ring coupled to said compressed air discharge passage; whereby a user pumps said manual pump, forcing compressed air through said one-way air inlet valve and into said compressed air collection chamber, causing said piston to slide outward and against said sealing nut cap, resulting in exposure of said air outlet hole in said piston from which said compressed air flows into said compressed air storage chamber where it is stored until said user moves said trigger handle into said second position, wherein said needle valve extends into said compressed air collection chamber and causes a pressure drop in said compressed air collection chamber that causes said piston to rebound and lose sealing contact with said sealing nut cap, resulting in an explosion of said compressed air into and through said compressed air output passage.