fig1 shows an article of furniture 1 having a furniture carcass 2 and drawers 3 displaceable relative thereto , as a perspective view . provided for displaceably mounting the drawers 3 are drawer extension guides 4 which each have a carcass rail 5 to be fixed to the furniture carcass 2 , and a drawer rail 8 which is displaceable relative to the carcass rail 5 . a central rail 7 ( not visible here ) is mounted displaceably between the carcass rail 5 and the drawer rail 8 , with at least one running carriage 35 arranged between the carcass rail 5 and the central rail 7 and / or between the central rail 7 and the drawer rail 8 . the central rail 7 makes it possible to provide for full extension of the drawer 3 so that the rear wall 9 of the drawer 3 can be pulled out substantially as far as the front end 10 of the furniture carcass 2 ( i . e ., the rear wall 9 is substantially flush with the front end 10 ). fig2 a shows a perspective view of the drawer extension guide 4 . the carcass rail 5 is to be fixed to a furniture carcass 2 by a fixing portion 6 extending perpendicularly in the mounted condition , and the displaceable drawer rail 8 is to be connected to the drawer 3 . the fixing portion 6 has a plurality of openings 34 for receiving fixing screws . the central rail 7 is mounted displaceably between the carcass rail 5 and the drawer rail 8 . it is possible to see a bearing 11 having a supporting roller 12 by way of which the drawer rail 8 is supported in the closed position on the carcass rail 5 . a snap - action connector 13 is provided for fixing the bearing 11 to the rails 7 , 8 . fig2 b shows a view on an enlarged scale of the front end region of the drawer extension guide 4 . the front end region of the drawer 3 can be raised and lowered by way of a height adjusting device 14 . the height adjusting device 14 includes a gripping portion 15 which is to be manually actuated , and has a mounting portion 16 which is connected thereto and on which a lateral edge region of the drawer 3 rests in the mounted condition . the gripping portion 15 can be positioned at any one of a plurality of predetermined latching positions 18 of the drawer rail 8 , wherein the mounting portion 16 ( and therewith the front end region of a drawer 3 ) assumes a different height position depending on the selection of a respective latching position 18 . fig3 a shows a perspective view of the front end region of the drawer extension guide 4 . the carcass rail 5 has the fixing portion 6 for mounting to the furniture carcass 2 , and a horizontal limb 19 on which the supporting roller 12 is supported in the closed position of the drawer rail 8 . in the illustrated embodiment , the bearing 11 with the supporting roller 12 is fixed to the central rail 7 . the supporting roller 12 cooperates on the one hand with the underside of a central limb 22 of the drawer rail 8 , and on the other hand with the horizontal limb 19 of the carcass rail 5 . the drawer rail 8 has a first side limb 20 facing towards the fixing portion 6 , and the first side limb 20 of the drawer rail 8 is arranged between the supporting roller 12 and the fixing portion 6 of the carcass rail 5 . the drawer rail 8 has two side limbs 20 , 21 and the , preferably flat , central limb 22 connecting the side limbs 20 , 21 , wherein the supporting roller 12 is arranged , preferably completely , between the two side limbs 20 , 21 of the drawer rail 8 . the mounting portion 16 , on which the front end region of the drawer 3 rests , is adapted to be adjustable in respect of height by way of the gripping portion 15 of the height adjusting device 14 . fig3 b shows a vertical section of the drawer extension guide 4 shown in fig3 a . the drawer rail 8 has a cavity delimited by the rail profile of the drawer rail 8 , wherein the supporting roller 12 is arranged preferably completely within that cavity . the drawer rail 8 is at least partially open downwardly . the central arrangement of the supporting roller 12 between relatively moveable rails 5 , 7 , 8 of the drawer extension guide 4 provides that the supporting roller 12 can be disposed in a compact arrangement in a comparatively narrow intermediate region , wherein the space 23 between the side limb 20 of the drawer rail 8 and the fixing portion 6 of the carcass rail 5 can be reduced in size and the drawer extension guide 4 overall can be made narrower and consequently more compact . fig4 a shows a slightly modified embodiment of the front end region of the drawer extension guide 4 . the bearing 11 with the supporting roller 12 is pivotably fixed to the central rail 7 by the snap - action connector 13 . in the illustrated embodiment , the central rail 7 has a horizontal limb 27 , at the front end of which is arranged a recess 25 which extends in the longitudinal direction of the horizontal limb 27 and is open forwardly . the recess 25 is adapted to receive the supporting roller 12 . in the front end region , the drawer rail 8 has a heightened portion 24 , preferably in the form of a stamped ( pressed ) portion , which cooperates with the supporting roller 12 in the closed condition of the drawer rail 8 . the heightened portion 24 provides that the drawer rail 8 can be raised to a defined degree in the closed condition , while unwanted downward movement of a heavily loaded drawer 3 can be substantially prevented . a further function of the heightened portion 24 is that the drawer rail 8 is admittedly supported on the supporting roller 12 by that heightened portion 24 in the closed condition , but upon opening of the drawer rail 8 ( which in the case of a differential extension arrangement moves at approximately twice the speed of the central rail 7 ), the supporting roller 12 is freed from the drawer rail 8 immediately . thus , the load of the drawer 3 is transmitted exclusively by carriages ( not shown ) with rolling bodies which are usually mounted displaceably between the rails 5 , 7 , 8 of the drawer extension guide 4 . in that way , the forces involved in the travel movement of the drawer extension guide 4 can be reduced . fig4 b shows a vertical section of the embodiment of the drawer extension guide 4 shown in fig4 a . it will be seen that , with the drawer rail 8 closed , the supporting roller 12 cooperates on the one hand with the heightened portion 24 of the drawer rail 8 and on the other hand with the horizontal limb 19 of the carcass rail 5 . the central rail 7 has a lateral profile portion 26 facing towards the first side limb 20 of the drawer rail 8 , wherein the lateral profile portion 26 of the central rail 7 is disposed between the supporting roller 12 and the first side limb 20 of the drawer rail 8 . in this embodiment , both the lateral profile portion 26 of the central rail 7 and also the first side limb 20 of the drawer rail 8 are disposed between the supporting roller 12 and the fixing portion 6 of the carcass rail 5 . the supporting roller 12 projects upwardly and downwardly beyond the horizontal limb 27 of the central rail 7 . fig5 a shows the front end region of the drawer extension guide 4 , in which the bearing 11 with the supporting roller 12 — unlike the preceding embodiment — is arranged on the drawer rail 8 . the bearing 11 is connected , preferably welded or riveted , to the underside of the central limb 22 of the drawer rail 8 . the bearing 11 with the supporting roller 12 is arranged at the front end region of the drawer rail 8 , and the supporting roller 12 , towards the end of the closing movement of the drawer rail , can pass into a forwardly open recess 25 in the central rail 7 , the supporting roller 12 being accommodated in the recess 25 in the central rail 7 when the drawer rail 8 is closed . fig5 b shows a vertical section of the fig5 a embodiment . in this case , the bearing 11 has a stationary , horizontally extending trunnion 28 , the supporting roller 12 being mounted rotatably at the trunnion 28 . in the closed position of the drawer extension guide 4 , the supporting roller 12 cooperates on the one hand with the underside of the central limb 22 of the drawer rail 8 and on the other hand with the horizontal limb 19 of the carcass rail 5 . the lateral profile portion 26 of the central rail 7 facing towards the side limb 20 of the drawer rail 8 is arranged between the supporting roller 12 and the side limb 20 of the drawer rail 8 . fig6 a shows a perspective view of a possible embodiment of the bearing 11 . the bearing 11 is to be fixed , preferably pivotably , to the central rail 7 or to the drawer rail 8 of the drawer extension guide 4 , by way of a snap - action connector 13 . the snap - action connector 13 has two resilient arresting elements 30 which , in the mounted position , embrace the projections 31 on the bearing 11 in positively locking relationship . the bearing 11 also has a resilient arm 32 , wherein the free end of the arm 32 in the mounted position is supported at that rail 7 and 8 on which the bearing 11 is arranged . tolerances in the drawer extension guide , which occur in the heightwise direction , can be substantially compensated for by the resilient arm 32 . the bearing 11 includes a guide 29 which surrounds the supporting roller 12 on all sides and in which the supporting roller 12 is loosely accommodated . the supporting roller 12 is mounted limitedly moveably in respect of height by the guide 29 . that mounting for the supporting roller 12 in a vertical direction can be achieved by at least one trunnion 28 of the bearing 11 projecting into an , preferably non - through going , opening 33 in the supporting roller 12 , the diameter of the opening 33 being larger than the diameter of the trunnion 28 . the supporting roller 12 thus does not have a stationary axis of rotation , but an axis of rotation which is moveable in respect of height . in that way , it is possible to accommodate additional tolerances in the guide system . fig6 b shows the bearing 11 with the supporting roller 12 fitted in the guide 29 and the fitted snap - action connector 13 , wherein the arresting elements 30 of the snap - action connector 13 embrace the projections 31 in positively locking relationship . fig6 c shows a perspective view in section of the bearing 11 . the supporting roller 12 is held moveably in respect of height by trunnions 28 which are arranged at both sides on the guide 29 and which respectively extend into an opening 33 , in the form of a blind hole , in the supporting roller 12 . the bearing 11 is made in one piece and can be easily produced from a plastic material by an injection molding process . the supporting roller 12 can also comprise plastic or metal . when the supporting roller 12 is made of metal , a plastic coating therearound may be desirable . in all embodiments , the supporting roller 12 can be of a spherical , cylindrical , disk - shaped or frustoconical configuration . it will be appreciated that it is also possible to provide two or more supporting rollers 12 which are arranged laterally one beside the other , preferably on a common axis , or also in such a way that the supporting rollers 12 are arranged one behind the other in the direction of displacement of the drawer rail 8 .
a drawer pull - out guide includes a body rail which can be mounted on a furniture body via a fastening section , and a drawer rail which can be fastened on a drawer and is mounted movably relative to the body rail . the drawer rail has a side web facing the fastening section . a central rail is mounted movably between the body rail and the drawer rail , and a bearing with at least one supporting roller via which the drawer rail is supported in the closed state is on the body rail . the bearing is arranged at a front end region of the central rail or of the drawer rail so as to be non - displaceable during operation in the longitudinal direction of the rail on which the bearing is arranged . the side web of the drawer rail is arranged between the supporting roller and the fastening section of the body rail .