Patent ID: 8528873

Claim:
A shelf system for use with a post having an aperture, said system comprising: a pin having a head having a first circumference, and a body having a second circumference smaller than said first circumference, said body including a portion extended through said aperture of said post; and a collar encircled around said post and rested on said pin head having said first circumference and on said portion of said pin body extended through said post having said second smaller circumference, and wherein said collar includes a first portion encircled around said post and engaged with said head of said pin, and a second portion encircled around said post and longitudinally offset from said first portion and engaged with said portion of said pin extended through said post, wherein each of the first and second portions of the collar include flat circumferential surfaces engaging said pin and permitting 360 degree rotation of the collar relative to the post, each of the flat circumferential surfaces including only a single indent defining a single rest position, when said head of said pin is positioned in the indent on a first of the circumferential surfaces and said portion of said pin body extending through said post is positioned in the indent on a second of the circumferential surfaces.