Telescoping conduit

Claim 2

In a leakproof telescoping conduit adaptable for conveying air and moisture sensitive solid materials which comprises in combination a first rigid conduit adaptable at one end for making a tight connection with an aperture and slideably connected at the other end to a second rigid conduit larger in diameter than the first rigid conduit said second rigid conduit adaptable at the end opposite the slideable connection for making a tight connection with an aperture, said second rigid conduit having sealably connected thereto an impermeable flexible conduit said impermeable flexible conduit disposed over the first rigid conduit and sealably connected to the first rigid conduit some distance from the slideable connection the improvement which comprises providing said second rigid conduit with adjustable means at the slideable connection for holding and compressing packing to control the frictional forces at the slideable connection and to prevent leaks at the slideable connection.

Claim 3

The leakproof telescoping conduit of claim 1 wherein said second rigid conduit has conduit guides in the form of collars disposed contiguously to the interior surface, to maintain the rigid conduits in substantial alignment.

Claim 4

The leakproof telescoping conduit of claim 2 wherein the conduit guides are formed of polymeric material.

Claim 5

The leakproof telescoping conduit of claim 2 wherein the conduit guides are formed from Teflon.

Claim 6

The telescoping conduit of claim 1 wherein the second rigid conduit has disposed at the slideable connection flange means for holding and compressing packing to prevent leaks and control the friction at the slideable connection, said flange means having provision for making a leak tight connection to the impermeable flexible conduit, and wherein there are contiguouslY disposed to the interior surface of said second rigid conduit, collars of polymeric material to maintain the conduits in substantial alignment.

Claim 7

The telescoping conduit of claim 1 wherein the second rigid conduit has disposed at the slideable connection flange means for holding and compressing packing to prevent leaks and control the friction at the slideable connection, said flange means having provision for making a leak tight connection to the impermeable flexible conduit, and wherein there are contiguously disposed to the interior surface of said second rigid conduit collars of polymeric material to maintain the conduits in substantial alignment and wherein said first rigid conduit has disposed at the end within the second rigid conduit an enlarged section which acts as a stop to prevent withdrawl of the first rigid conduit from within the said second rigid conduit at the slideable connection.

Claim 8

The telescoping conduit of claim 1 wherein the second rigid conduit has disposed at the slideable connection flange means for holding and compressing packing to prevent leaks and control the friction at the slideable connection, said flange means having provision for making a leak tight connection to the impermeable flexible conduit, and wherein there are contiguously disposed to the interior surface of said second rigid conduit collars of polymeric material to maintain the conduits in substantial alignment and wherein said first rigid conduit has disposed at the end within the second rigid conduit an enlarged section which acts as a stop to prevent withdrawl of the first rigid conduit from within the second rigid conduit through the slideable connection and wherein said first rigid conduit has disposed at the enlarged section a conventionally mounted wiper ring which moves adjacent to the interior surface of the second rigid conduit to prevent buildup of material which can impede the relative movement of the rigid conduits.