Molded barrel

Abstract

One end wall of a molded barrel of thermoplastic material has a general plane and is provided with at least two depressions at opposite diametric sides. A tubular portion is located in each depression and .Iadd.is .Iaddend.of one piece with the end wall, each of the tubular portions communicating with the interior of the barrel and terminating in the general plane. Reinforcing webs are provided in the respective depression at that side of the associated projection which faces at the middle of the one end wall and these reinforcing webs are each of one piece with the one end wall and the respective projection, bridging the respective depression. BACKGROUND OF THE INVENTION

What is claimed as new and desired to be provided by Letters Patent is set forth in the appended: 
     
       1. A barrel of thermoplastic material comprising a circumferential wall; a pair of spaced end walls one of which has a general plane; at least two depressions in said one end wall at opposite diametric sides thereof; a tubular .[.projections.]. .Iadd.projection .Iaddend.located in each depression and being of one piece with said one end wall, each of said tubular projections communicating with the interior of said barrel and terminating in said general plane; and reinforcing webs in the respective depressions at that side of the associated projection which faces the middle of said one end wall, said reinforcing webs being of one piece with said one end wall and the respective projection .Iadd., each reinforcing web having an upper section .Iaddend.connected to .[.said.]. .Iadd.its respective .Iaddend.projection .[.only.]. within the upper region .Iadd.of said respective projection. .Iaddend..[.thereof so as to bridge the depression between said one end wall and the respective projection..]. 
     
     
       2. A barrel as defined in claim 1, wherein said barrel is blow molded, and wherein said webs reinforce said projections against dislocations resulting from the development of shrinkage stresses in said barrel subsequently to molding of the same. 
     
     
       3. A barrel as defined in claim 1, said projections each being provided with an inner circumferential surface; and further comprising internal screw threads provided in each of said inner circumferential surfaces adjacent the open ends of the respective tubular projections. 
     
     
       4. A barrel as defined in claim 1; said projections each having an inner circumferential surface which includes, at a location inwardly spaced from the respective open end of said projections, a first inwardly convergent scaling surface portion, and inwardly adjacent to the same a second cylindrical surface portion. 
     
     
       5. A barrel as defined in claim 4, wherein said projections have walls which are circumferentially cinched in inward directions to thereby provide said first inwardly convergent sealing surface portion. 
     
     
       6. A barrel as defined in claim 4, wherein said first sealing surface portion is conically convergent. 
     
     
       7. A barrel as defined in claim 4, wherein each of said projections has a first end merging with said one end wall and a free second end, the respective web being of one piece with the projection intermediate said ends; and wherein said sealing surface portions are provided intermediate the respective first end and web. 
     
     
       8. A barrel as defined in claim 4; further comprising a closure member for each of said projections and each including a ring seal adapted for sealing engagement with the respective first sealing surface portion, and a circumferentially complete edge adapted for sealing engagement with the respective second sealing surface portion. 
     
     
       9. A barrel as defined in claim 4, said inner circumferential surfaces being provided with screw threads adjacent the respective open end; and wherein said closure members are cap-shaped and each include a transverse wall and an extension receivable in the respective open end and formed with screwthreads matingly engageable with these on the respective inner circumferential surface. 
     
     
       10. A barrel as defined in claim 9, said edge being a free edge of the respective extension.