Pull-out guide for drawers

Abstract

A pull-out guide assembly for .[.drawers comprising.]. .Iadd.a drawer includes .Iaddend.a pull-out rail fastened to the drawer, a supporting rail fastened to the body of .[.the piece.]. .Iadd.an article .Iaddend.of furniture and a center rail differentially running between .[.said.]. .Iadd.such .Iaddend.two rails on each side of the drawer. Running carriages which hold load-transmitting running rollers are arranged between .[.said.]. .Iadd.the .Iaddend.rails. Driving rollers which run on the supporting .[.rails.]. .Iadd.rail .Iaddend.and on the pull-out .[.rails.]. .Iadd.rail .Iaddend.are mounted on the center .[.rails.]. .Iadd.rail.Iaddend.. The center .[.rails have Z-profiles.]. .Iadd.rail has a Z-shaped profile.Iaddend., and the supporting .[.rails.]. .Iadd.rail .Iaddend.and the pull-out .[.rails.]. .Iadd.rail .Iaddend.have .[.U-profiles.]. .Iadd.U-shaped profiles .Iaddend.which are substantially half-covered.

What is claimed is: 
     
       1. A pull-out guide assembly for .[.drawers.]. .Iadd.a drawer and .Iaddend.comprising.Iadd., for each side of the drawer:.Iaddend. a pull-out rail .Iadd.to be .Iaddend.fastened to the drawer.[.,.]..Iadd.;.Iaddend.   a supporting rail .Iadd.to be .Iaddend.fastened to the body of .[.the piece.]. .Iadd.an article .Iaddend.of furniture .[.and.]..Iadd.; .Iaddend.   a center rail differentially running between said .[.two.]. .Iadd.pull-out and supporting .Iaddend.rails .[.on each side of the drawer,.]..Iadd.; .Iaddend..[.running carriages holding.].  load-transmitting cylindrical bodies .[.being.]. arranged between said rails.[., and.]..Iadd.; .Iaddend.   driving rollers running on .[.the.]. .Iadd.said .Iaddend.supporting .[.rails.]. .Iadd.rail .Iaddend.and on .[.the.]. .Iadd.said .Iaddend.pull-out .[.rails being.]. .Iadd.rail and .Iaddend.mounted on .[.the.]. .Iadd.said .Iaddend.center .[.rails, wherein.]. .Iadd.rail;.Iaddend.   said center .[.rails have Z-profiles.]. .Iadd.rail having a Z-shaped profile; .Iaddend.and   said supporting .[.rails.]. .Iadd.rail .Iaddend.and said pull-out .[.rails have U-profiles.]. .Iadd.rail having U-shaped profiles .Iaddend.which are substantially half-covered and .Iadd.which are respectively .Iaddend.upwardly and downwardly open.   
     
     
       2. A pull-out guide assembly as claimed in claim 1, wherein said driving rollers are received in the profile of said supporting rail. 
     
     
       3. A pull-out guide assembly as claimed in claim 1, wherein .[.the.]. .Iadd.said .Iaddend.cylindrical bodies .[.which are designed as.]. .Iadd.comprise .Iaddend.running rollers .[.have.]. .Iadd.each having a diameter .Iaddend.substantially half the diameter of said driving rollers. 
     
     
       4. A pull-out guide assembly as claimed in claim 2 wherein .Iadd.some of .Iaddend.said .[.running rollers.]. .Iadd.cylindrical bodies .Iaddend.are arranged in said supporting .[.rails.]. .Iadd.rail.Iaddend., and said driving rollers are arranged at .Iadd.an .Iaddend.opposite .].sides.]. .Iadd.side .Iaddend.of said center rail .Iadd.from said some cylindrical bodies..Iaddend. 
     
     
       5. A pull-out guide assembly as claimed in claim 1, .Iadd.wherein said cylindrical bodies and said driving rollers are arranged such that, .Iaddend.in .[.the.]. .Iadd.an .Iaddend.inserted position of the drawer, .Iadd.there are .Iaddend.two .[×]. .Iadd.arrangements of .Iaddend.two .[.running rollers.]. .Iadd.cylindrical bodies .Iaddend.and one driving roller .[.are arranged on a.]. .Iadd.aligned along respective .Iaddend.common vertical .[.line on each side of the drawer.]. .Iadd.lines.Iaddend.. 
     
     
       6. A pull-out guide assembly as claimed in claim 1, wherein said supporting rail and said pull-out rail have identical profiles and are .[.in.]..Iadd., with .Iaddend.respect .[.of.]. .Iadd.to the orientation of .Iaddend.the profiles .Iadd.thereof, .Iaddend.turned .[.in.]. .Iadd.with .Iaddend.respect .[.of.]. .Iadd.to .Iaddend.each other by 180°. .Iadd.7. A pull-out guide assembly as claimed in claim 1, wherein said cylindrical bodies are arranged in running carriages..Iaddend. .Iadd.8. In an article of furniture including a furniture body, a drawer movable into and out of said furniture body, and pull-out guide assemblies on opposite sides of said drawer for guiding movement thereof relative to said furniture body, the improvement wherein each said pull-out guide assembly comprises: a pull-out rail fastened to said drawer;   a supporting rail fastened to a respective side of said furniture body;   a center rail differentially running between said pull-out and supporting rails;   load-transmitting cylindrical bodies arranged between said rails;   driving rollers running on said supporting rail and on said pull-out rail and mounted on said center rail;   said center rail having a Z-shaped profile; and   said supporting rail and said pull-out rail having U-shaped profiles which are substantially half-covered and which are respectively upwardly and downwardly open..Iaddend. .Iadd.9. The improvement claimed in claim 8, wherein said driving rollers are received in the profile of said supporting rail..Iaddend. .Iadd.10. The improvement claimed in claim 9, wherein some of said cylindrical bodies are arranged in said supporting rail, and said driving rollers are arranged at an opposite side of said   
     
     
        center rail from said some cylindrical bodies..Iaddend. .Iadd.11.  The improvement claimed in claim 8, wherein said cylindrical bodies are 
     
     
        arranged in running carriages..Iaddend. .Iadd.12.  The improvement claimed in claim 8, wherein said cylindrical bodies and said driving roller are arranged such that, in an inserted position of said drawer, there are two arrangements of two cylindrical bodies and one driving roller aligned along respective common vertical lines..Iaddend. .Iadd.13. The improvement claimed in claim 8, wherein said supporting rail and said pull-out rail have identical profiles and are, with respect to the orientations of the profiles thereof, turned with respect to each other by 180°..Iaddend. .Iadd.14. The improvement claimed in claim 8, wherein said cylindrical bodies comprise running rollers each having a diameter substantially half the diameter of said running rollers..Iaddend.