Pressurization apparatus

Claim 2

Apparatus for enclosing and sealing the open end of a cylindrical container having an outwardly radially extending flange near the open end comprising a. collar means adapted to surround the outer surface of said container and having an internal dimension less than the external dimension of said flange, b. cap means adapted to removeably mate with said collar means and form a seal with the top surface of said flange, and c. means for injecting gas through said cap means into the interior of said container.

Claim 3

Apparatus as defined in claim 1 wherein said collar means comprises a semi-rigid circular body having a plurality of spaced downwardly projecting lugs, the bottom surfaces of which are inclined with respect to the major plane of said circular body; and said cap means includes inwardly projecting tabs adapted to mate with said lugs and urge said cap into sealing contact with said flange.

Claim 4

Apparatus as defined in claim 1 wherein said cap includes an upwardly projecting barrel with a reciprocal piston mounted therein and further includes a sealing plate enclosing the open end of said container and cooperating with said barrel and piston to define a cavity within said cap adjacent the end of said container, said sealing plate including a check valve permitting gas flow from said cavity into said container.

Claim 5

Apparatus as defined in claim 3 wherein the volume displaceable by said piston is about five to eight times as large as the volume of said cavity at maximum displacement of said piston.

Claim 6

Pressurization apparatus comprising: a. a cylindrical container having an open end; b. a groove encircling said container near said open end; c. collar means adapted to fit within said groove; d. elastic retainer means adapted to ride within said groove and urge said collar means toward the open end of said container; e. sealing means adapted to mate with the open end of said container; f. cap means enclosing said sealing means and adapted to be removeable affixed to said collar means and urge said sealing means against the open end of said container, and cooperating with said sealing means to form an enclosed cavity; g. means for injecting gas into said cavity; and h. valve means permitting gas flow from said cavity into said container.

Claim 7

Pressurization apparatus comprising: a. a cylindrical container having an open end; b. a groove encircling said container near said open end; c. collar means adapted to fit within said groove; d. elastic retainer means adapted to ride within said groove and urge said collar means toward the open end of said container; e. sealing means adapted to mate with the open end of said container; f. cap means enclosing said sealing means and adapted to be removeable affixed to said collar means and urge said sealing means against the open end of said container, and cooperating with said sealing means to form an enclosed cavity; g. means for injecting gas into said cavity; and h. valve means permitting gas flow from said cavity into said container.

Claim 8

Apparatus as defined in claim 5 wherein said means for injecting gas into said cavity comprises a barrel forming an extension of said cap and a reciprocal piston mounted within said barrel.

Claim 9

ApParatus as defined in claim 6 wherein said cap means, said sealing means and said barrel are formed in a single unitary construction defining a cavity adjacent the open end of said container.

Claim 10

Apparatus as defined in claim 7 wherein the volume of said piston reciprocating within said barrel reduces the volume of said cavity by a ratio of about 5 to 1 to about 8 to 1.