Patent ID: 9044088
Filing Date: 2015-06-02
Classification: A47B

Abstract:
1. An extension guide for a drawer, comprising: a set of rails including a carcass rail to be fixed to a furniture carcass, a drawer rail to be fixed to the drawer, and a central rail mounted movably between said carcass rail and said drawer rail; a carriage mounted displaceably between two rails of said set of rails; a positive control mechanism for synchronizing a relative movement sequence of said set of rails, said positive control mechanism including a first synchronization wheel in the form of a pinion gear cooperating with a first running surface on a first one of said set of rails or said carriage, and a second synchronization wheel in the form of a pinion gear cooperating with a second running surface on a second one of said set of rails or said carriage, said first synchronization wheel and said second synchronization wheel being motionally coupled together, said first synchronization wheel being located at a first side of a limb portion of said central rail and said second synchronization wheel being located at a second side of said limb portion of said central rail opposite said first side such that said first synchronization wheel and said second synchronization wheel are separated from each other by said limb portion of said central rail, said first synchronization wheel and said second synchronization wheel being connected by a shaft extending through said limb portion of said central rail; and an overload protection device configured to operate between said first synchronization wheel and said second synchronization wheel so as to uncouple and desynchronize the relative movement sequence of said set of rails when a predetermined torque acting on said first synchronization wheel and said second synchronization wheel is exceeded wherein said overload protection device comprises a coupling including a first latching wheel and a second latching wheel configured to remain in position relative to each other below the predetermined torque, said first latching wheel and said second latching wheel being made of plastic having different hardnesses so that said first latching wheel is more flexible than said second latching wheel to allow uncoupling of said first latching wheel from said second latching wheel above the predetermined torque.