# US 12,758,013 B2 · Slide rail assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,758,013 B2 - Document ID: US12758013B2 - Status: Granted - Kind: B2 - Application number: 18/967,249 - Filed: 2024-12-03 - Published: 2025-12-25 - Granted: 2026-10-13 - Earliest claimed: 2024-06-19 - Assignees: King Slide Works Co., Ltd.; King Slide Technology Co., Ltd. - Applicants: King Slide Works Co., Ltd.; King Slide Technology Co., Ltd. - Inventors: Ken-Ching Chen; Shun-Ho Yang; Chun-Yi Ho; Chun-Chiang Wang - Web page: https://patentgrep.com/patent/US12758013B2 ## CPC - A47B 88/473: Braking devices, e.g. linear or rotational dampers or friction brakes; Buffers; End stops - A47B 88/443: Successive movement of rails within drawer slides, i.e. at least one rail element is not moving during the movement of other elements - A47B 88/49: with double extensible guides or parts - A47B 2210/007: Three slide synchronisation - A47B: TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE (furniture jointing F16B) ## Abstract A slide rail assembly includes two slide rails. During a process of a first one of the two slide rails being moved relative to a second one of the two slide rails along a predetermined direction, a first predetermined feature and a second predetermined feature are configured to contact each other to provide resistance in order to stop or slow down the relative movement between the two slide rails. ## Claims ### Claim 1 A slide rail assembly, comprising: a first rail arranged with a blocking feature; a second rail; a third rail movably mounted between the first rail and the second rail; and an auxiliary member movably mounted on the third rail, the auxiliary member being movable between a first state and a second state; wherein the second rail is arranged with a first predetermined feature, and the third rail is arranged with a second predetermined feature; wherein when the third rail is located at a predetermined position relative to the first rail and when the auxiliary member is in the first state, the blocking feature is configured to block the auxiliary member in order to prevent the third rail from being moved from the predetermined position along a predetermined direction; wherein during a process of the second rail being moved a predetermined distance along the predetermined direction relative to the third rail located at the predetermined position, the first predetermined feature and the second predetermined feature are configured to contact each other in order to slow down movement of the second rail along the predetermined direction relative to the third rail; wherein one of the first predetermined feature and the second predetermined feature has a first guiding surface; wherein during the process of the second rail being moved the predetermined distance along the predetermined direction relative to the third rail located at the predetermined position, the first predetermined feature and the second predetermined feature are configured to contact each other through the first guiding surface in order to slow down the movement of the second rail along the predetermined direction relative to the third rail; wherein during a process of the second rail being further moved along the predetermined direction relative to the third rail located at the predetermined position, the first predetermined feature and the second predetermined feature are configured to contact each other in order to provide resistance to the second rail due to friction until the first predetermined feature crosses over the second predetermined feature. ### Claim 2 (depends on 1) The slide rail assembly of claim 1, wherein the second rail comprises a working feature, and the auxiliary member comprises an auxiliary part; wherein during the process of the second rail being moved along the predetermined direction relative to the third rail located at the predetermined position, the auxiliary member is moved to switch from the first state to the second state such that the auxiliary part of the auxiliary member and the working feature are configured to be engaged with each other, in order to allow the second rail and the third rail to be synchronously moved relative to the first rail along the predetermined direction. ### Claim 3 (depends on 1) The slide rail assembly of claim 1, wherein the one of the first predetermined feature and the second predetermined feature, which has the first guiding surface, further has a second guiding surface opposite to the first guiding surface. ### Claim 4 (depends on 1) The slide rail assembly of claim 1, wherein the auxiliary member is pivotally connected to the third rail through a shaft. ### Claim 5 (depends on 4) The slide rail assembly of claim 4, further comprising an elastic member configured to provide an elastic force to the auxiliary member. ### Claim 6 (depends on 1) The slide rail assembly of claim 1, wherein at least one of the first predetermined feature and the second predetermined feature is a protrusion. ### Claim 7 (depends on 1) The slide rail assembly of claim 1, wherein each of the second rail and the third rail has a first end part and a second end part; wherein the first predetermined feature is located adjacent to the first end part of the second rail, and the second predetermined feature is located adjacent to the first end part of the third rail. ### Claim 8 (depends on 7) The slide rail assembly of claim 7, wherein the first rail has a first end part and a second end part; wherein the blocking feature is located adjacent to the second end part of the first rail, and the auxiliary member is located adjacent to the second end part of the third rail; wherein when the slide rail assembly is in a retracted state, the first end parts of the second rail and the third rail are adjacent to the first end part of the first rail. ### Claim 9 A slide rail assembly, comprising: a first rail arranged with a blocking feature; a second rail; a third rail movably mounted between the first rail and the second rail; and an auxiliary member movably mounted on the third rail; wherein the second rail is arranged with a first predetermined feature, and the third rail is arranged with a second predetermined feature; wherein when the third rail is located at a retracted position relative to the first rail and when the auxiliary member is in a first state, the blocking feature is configured to block the auxiliary member; wherein during a process of the second rail being moved a predetermined distance along an opening direction relative to the third rail located at the retracted position, the first predetermined feature and the second predetermined feature are configured to contact each other in order to provide resistance to the second rail; wherein one of the first predetermined feature and the second predetermined feature has a first guiding surface; wherein during the process of the second rail being moved the predetermined distance along the opening direction relative to the third rail located at the retracted position, the first predetermined feature and the second predetermined feature are configured to contact each other through the first guiding surface in order to stop the second rail at a temporary position; wherein during a process of the second rail being further moved from the temporary position along the opening direction relative to the third rail located at the retracted position, the first predetermined feature and the second predetermined feature are configured to contact each other in order to provide resistance to the second rail due to friction until the first predetermined feature crosses over the second predetermined feature. ### Claim 10 (depends on 9) The slide rail assembly of claim 9, wherein the second rail comprises a working feature, and the auxiliary member comprises an auxiliary part; wherein during the process of the second rail being moved along the opening direction relative to the third rail located at the retracted position, the auxiliary member is moved to switch from the first state to a second state, and the blocking feature no longer blocks the auxiliary member, and the auxiliary part of the auxiliary member and the working feature are configured to be engaged with each other, such that the second rail and the third rail are synchronously movable relative to the first rail along the opening direction. ### Claim 11 (depends on 9) The slide rail assembly of claim 9, wherein the auxiliary member is pivotally connected to the third rail through a shaft. ### Claim 12 A slide rail assembly, comprising: a first rail arranged with a blocking feature; a second rail; a third rail movably mounted between the first rail and the second rail; and an auxiliary member movably mounted on the third rail, the auxiliary member being movable between a first state and a second state; wherein the second rail is arranged with a first predetermined feature, and the third rail is arranged with a second predetermined feature; wherein when the third rail is located at a predetermined position relative to the first rail and when the auxiliary member is in the first state, the blocking feature is configured to block the auxiliary member in order to prevent the third rail from being moved from the predetermined position along a predetermined direction; wherein during a process of the second rail being moved a predetermined distance along the predetermined direction relative to the third rail located at the predetermined position, the first predetermined feature and the second predetermined feature are configured to contact each other in order to slow down movement of the second rail along the predetermined direction relative to the third rail; wherein the auxiliary member is pivotally connected to the third rail through a shaft. ### Claim 13 A slide rail assembly, comprising: a first rail arranged with a blocking feature; a second rail; a third rail movably mounted between the first rail and the second rail; and an auxiliary member movably mounted on the third rail, the auxiliary member being movable between a first state and a second state; wherein the second rail is arranged with a first predetermined feature, and the third rail is arranged with a second predetermined feature; wherein when the third rail is located at a predetermined position relative to the first rail and when the auxiliary member is in the first state, the blocking feature is configured to block the auxiliary member in order to prevent the third rail from being moved from the predetermined position along a predetermined direction; wherein during a process of the second rail being moved a predetermined distance along the predetermined direction relative to the third rail located at the predetermined position, the first predetermined feature and the second predetermined feature are configured to contact each other in order to slow down movement of the second rail along the predetermined direction relative to the third rail; wherein each of the second rail and the third rail has a first end part and a second end part; wherein the first predetermined feature is located adjacent to the first end part of the second rail, and the second predetermined feature is located adjacent to the first end part of the third rail.