Patent ID: 8678529
Filing Date: 2014-03-25
Classification: A47B

Abstract:
1. A three-story drawer rail assembly comprising: a fixed rail; an intermediate rail; and an outer pull-out rail; wherein the intermediate rail and the outer pull-out rail both have a horizontal plane and two vertical planes, wherein a first retainer is set between said fixed rail and said intermediate rail, two first rollers are positioned parallel to the horizontal plane, two second rollers positioned perpendicular to the horizontal plane being associated with the first retainer, both said first roller and said second roller contact a surface of the fixed rail and a surface of the intermediate rail, a second retainer being set between the intermediate rail and the outer pull-out rail, a third roller parallel to said horizontal plane being associated with the second retainer, contacting the surface of the intermediate rail and an inner surface of outer pull-out rail, wherein each said vertical plane of the outer pull-out rail has a first bending part and a second bending part, the first bending part is located at a location where the outer pull-out rail's horizontal plane and vertical plane are joined to each other, the second bending part is located at an end of the vertical plane a third bending part and a fourth bending part relate to the vertical plane of the intermediate rail, the third bending part is located at a location where the horizontal plane and vertical plane are joined to each other, opposite to the first bending part of the pull-out rail, the fourth bending part is located below the third bending part, opposite the second bending part of the outer pull-out rail, a first ball being positioned between the first bending part and the third bending part, a second ball being positioned between the second bending part and the fourth bending part, the first ball and the second ball are restricted by the second retainer.