Housing for a ring binder mechanism and a ring binder formed of same

A ring binder mechanism including a housing and a pivotable lower structure to which a plurality of pairs of half-ring members are mounted, wherein said housing includes a central portion with two adjoining skirt portions for supporting said pivotable lower structure for pivotal movement, wherein said housing includes at least two ridges on an upper surface of said central portion, and wherein a recess of a substantially planar bottom is provided between said ridges.

A housing for a ring binder mechanism including an upper central portion with two adjoining lower skirt portions, wherein said skirt portions are deformable to support a pivotable lower structure, wherein said housing includes at least two ridges on an upper surface of said central portion, wherein each said ridge joins said central portion along respective first and second lines, wherein the distance between said first line and a longitudinal axis of said housing is smaller than the distance between said second line and said longitudinal axis of said housing, and wherein a plane containing said first lines is below a plane containing said second lines.

A ring binder mechanism including a housing and a pivotable lower structure to which a plurality of pairs of half-ring members are mounted, wherein said housing includes a central portion with two adjoining portions for supporting said lower structure for pivotal movement, wherein said housing includes at least two ridges on an upper surface of said central portion, wherein each said ridge joins said central portion along respective first and second lines, wherein the distance between said first line and a longitudinal axis of said housing is smaller than the distance between said second line and said longitudinal axis of said housing, and wherein a plane containing said first lines is below a plane containing said second lines.