Accumulator

Claim 1

In an accumulator which comprises a first hollow container having an opening at one end and an inlet for a working fluid at the other end, a second hollow container being jointed by welding at the opening with said first container so as to form a hollow space therewithin, and a flexible member disposed in said hollow space and partitioning said hollow space into two compartments; the improvement wherein said first container comprises a cylindrical body having said opening at one end thereof, and a bottom portion formed integrally with and extending from the opposite end of said cylindrical body and having said fluid inlet, said cylindrical body and said bottom portion being substantially uniform and identical in thickness, the upper portion of said cylindrical body being formed with a portion bent outwardly and a portion bent and further extending upwardly from said outwardly bent portion, said upwardly extending portion extending generally straightly to said opening; said second container comprises a cylindrical body having one open end to be snugly inserted upon the inner surface of said first container and a top portion formed integrally with the opposite end of said cylindrical body, said cylindrical body and said top portion being substantially uniform and identical in thickness, said cylindrical body having a portion bent inwardly, a portion adjacent said inwardly bent portion and bent downwardly, and a curled open end adjacent said downwardly bent portion, said bent portions and curled end of said cylindrical body of said second container being complementary in profile with said outwardly bent portion and said upwardly extending portion of said cylindrical body of said first container respectively so that there is defined an annular space between said first and second containers; said flexible member having an annular shaped and thickened open end adapted to be held snugly in said annular space defined between said first and second containers; said one open end of said first container being disposed at a substantial distance in the longitudinal direction toward said top end of said second container away from said annular space, whereby welding heat may be effectively dissipated until it reaches said annular shaped end of said flexible member, and the area near said annular shaped end of said flexible member may be permitted to be deformed smoothly along the smooth surface of said continuously curled end of said second container at the time of inflow of said working fluid through said inlet into said compartment.