# US 11,304,521 B2 · Arrangement of a pull-out guide, a rail synchronization device, and a driver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,304,521 B2 - Document ID: US11304521B2 - Status: Granted - Kind: B2 - Application number: 16/945,005 - Filed: 2020-07-31 - Published: 2020-11-19 - Granted: 2022-04-19 - Earliest claimed: 2018-02-01 - Assignees: Julius Blum GmbH - Applicants: Julius Blum GmbH - Inventors: Tobias Hornikel - Web page: https://patentgrep.com/patent/US11304521B2 ## CPC - A47B 88/453: Actuated drawers - A47B 88/45: Synchronisation of cooperating drawer slides, i.e. with a coordination of the rail movement of different drawer slides - A47B 88/463: self-opening - A47B 88/497: with other guiding mechanisms, e.g. scissor mechanisms - A47B 2210/0078: Drawers with parallel guidance or synchronization by pinion-shaft linkages - A47B: TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE (furniture jointing F16B) ## Abstract An arrangement of a pull-out guide can be fastened to a piece of furniture, and the pull-out guide has a first rail, a second rail that is movably mounted on the first rail, and a rail synchronization device. The rail synchronization device includes a toothed rack connected to the first rail, a toothed wheel meshing with the toothed rack, and a bearing block connected to the second rail. The toothed wheel is rotatably mounted in the bearing block, and a driver for a drawer drive device is connected to the toothed rack of the rail synchronization device. ## Claims ### Claim 1 An arrangement comprising: an extension guide to be fastened to an item of furniture, the extension guide including a first rail and a second rail movably mounted on the first rail; a rail synchronization device including a toothed rack connected to the first rail, a toothed wheel meshing with the toothed rack, and a bearing block connected to the second rail, the toothed wheel being rotatably mounted in the bearing block; and an entrainment member fixed to the toothed rack so as to be immovable relative to the toothed rack, the entrainment member comprising an entrainment plate and an entrainment pin on the entrainment plate so as to be immovable relative to the entrainment plate, the entrainment pin being configured to engage a drawer drive device, wherein the toothed rack rests on the entrainment member such that the entrainment member supports the toothed rack, and wherein the bearing block receives the toothed rack so as to support a portion of the toothed rack such that the toothed rack is free of any direct support between the entrainment plate and the bearing block. ### Claim 2 (depends on 1) The arrangement according to claim 1, wherein the first rail is a carcass rail to be fastened to a furniture carcass, and the second rail is a drawer rail to be fastened to a drawer. ### Claim 3 (depends on 1) The arrangement according to claim 1, wherein the rail synchronization device includes a synchronization rod connected to the toothed wheel so as to be rotatable together with the toothed wheel. ### Claim 4 (depends on 1) The arrangement according to claim 1, wherein the toothed rack includes an elongated toothed bar and a first holding element, the toothed bar being arranged to rest on the entrainment member by the first holding element. ### Claim 5 (depends on 4) The arrangement according to claim 4, wherein the first holding element is made of plastic. ### Claim 6 (depends on 4) The arrangement according to claim 4, wherein the first holding element has a guiding groove for receiving and guiding the toothed bar. ### Claim 7 (depends on 4) The arrangement according to claim 4, wherein the toothed bar is fixed to the first holding element in a longitudinal direction. ### Claim 8 (depends on 4) The arrangement according to claim 4, wherein the toothed rack further includes a second holding element connecting the toothed bar to the first rail. ### Claim 9 (depends on 8) The arrangement according to claim 8, wherein the second holding element is made of plastic. ### Claim 10 (depends on 1) The arrangement according to claim 1, wherein the bearing block is detachably mounted to the second rail by a locking element. ### Claim 11 (depends on 1) The arrangement according to claim 1, wherein the entrainment plate is connected to the first rail. ### Claim 12 (depends on 1) The arrangement according to claim 1, further comprising a drawer drive device for engaging the entrainment member. ### Claim 13 (depends on 12) The arrangement according to claim 12, wherein the drawer drive device is connected to the second rail. ### Claim 14 (depends on 13) The arrangement according to claim 13, wherein the drawer drive device is detachably connected to the second rail. ### Claim 15 (depends on 12) The arrangement according to claim 12, wherein the drawer drive device is an ejection device configured to eject the drawer from a closed position into an open position. ### Claim 16 (depends on 15) The arrangement according to claim 15, wherein the ejection device includes a locking device configured to be unlocked by over-pressing the drawer in a closing direction. ### Claim 17 (depends on 15) The arrangement according to claim 15, wherein the ejection device includes a carrier, an ejection element movable relative to the carrier, and an ejection force storage member attached to both the carrier and the ejection element. ### Claim 18 (depends on 17) The arrangement according to claim 17, wherein the carrier is fastened to the second rail. ### Claim 19 (depends on 1) An item of furniture comprising a furniture carcass, a drawer, and the arrangement according to claim 1. ### Claim 20 An arrangement comprising: an extension guide to be fastened to an item of furniture, the extension guide including a first rail and a second rail movably mounted on the first rail; a rail synchronization device including a toothed rack connected to the first rail, a toothed wheel meshing with the toothed rack, and a bearing block connected to the second rail, the toothed wheel being rotatably mounted in the bearing block; and an entrainment member fixed to the toothed rack so as to be immovable relative to the toothed rack, wherein the entrainment member comprises an entrainment plate connectable to the first rail so as to support a portion of the toothed rack, and an entrainment pin on the entrainment plate so as to be immovable relative to the entrainment plate, the entrainment pin being configured to engage a drawer drive device, and wherein the bearing block receives the toothed rack so as to support a portion of the toothed rack such that the toothed rack is free of any direct support between the entrainment plate and the bearing block. ### Claim 21 An arrangement comprising: an extension guide to be fastened to an item of furniture, the extension guide including a first rail and a second rail movably mounted on the first rail; a rail synchronization device including a toothed rack connected to the first rail, a toothed wheel meshing with the toothed rack, and a bearing block connected to the second rail, the toothed wheel being rotatably mounted in the bearing block; a pair of drawer drive devices to be arranged on opposite sides of a movable furniture part, the pair of drawer drive devices including a synchronization rod for synchronizing an operation of the drawer drive devices; and an entrainment member fixed to the toothed rack so as to be immovable relative to the toothed rack, the entrainment member comprising an entrainment plate and an entrainment pin on the entrainment plate so as to be immovable relative to the entrainment plate, the entrainment pin being configured to engage a respective one of the drawer drive devices. ### Claim 22 (depends on 21) The arrangement according to claim 21, wherein the toothed rack rests on the entrainment member such that the entrainment member supports the toothed rack.