Patent ID: 7959221

Claim:
A pinch-resistant four bar linkage system for a chair having a leg rest extension, the linkage system comprised of: a first set of two linkage members of irregular geometric shapes having non-parallel opposed edges, said first set connected at one end to a leg rest platform and at a second end to a seat member, each linkage member in said first set of linkage members is displaced from one another and pivotally connected to one another by a connecting bolt, while a spacing member maintains the displacement between each of the connected linkage members; and a second set of two linkage members of irregular geometric shapes having non-parallel opposed edges, where said second set is connected to the first set of linkage members and one end of the second set is connected to the leg rest platform and a second end to the seat member, each linkage member in said second set of linkage members is displaced from one another and pivotally connected to one another by a connecting bolt, while a spacing member maintains the displacement between each of the connected linkage members, wherein the linkage system is movable between a stowed position in which the leg rest platform is proximate to the seat member and an extended position in which the leg rest platform is distal to the seat member such that no lateral opening is formed between opposed edges of any of the irregularly shaped linkage members when the linkage system is in the extended position.