Collapsible arm chair

Claim 1

A collapsible chair comprising a pair of horizontally spaced side members, means mounting said side members on a platform for pivotal movement about a first generally horizontal axis between an erect position in which said side members are upstanding and a collapsed position in which said side members are generally horizontally disposed, a backrest disposed intermediate said spaced side members and connected thereto, a seat disposed intermediate said spaced side members and mounted on each of said side members for free pivotal movement when said side members are stationary and erect about a second generally horizontal axis between a folded upwardly extending position and an unfolded seat-defining position, a latch movable between a locking position in which said side members are maintained in said erect position and a released position in which said side members are free to pivot about said first generally horizontal axis, locking means movable into engagement with said latch when said seat is pivoted to said unfolded seat-defining position and said latch is in said locking position effective to maintain said latch in said locking position and prevent pivotal movement of said side members from said erect position, said means for mounting each of said side members on a platform including an upstanding bracket defining an upwardly open downwardly extending slot, each of said side members defining a slot for registery with the slot of its respective bracket when said side member is erect, said latch comprising a locking pin slideably carried in said slots of each of said side members for movement into and out of said slots of said bracket, said latch further comprises a link connected to each of said locking pins and being effective when moved longitudinally to effect sliding movement of said locking pins in said slots, said latch being in a fully locked position when each locking pin is disposed in both a slot of said bracket and a slot of said adjacent side member, said locking means being effective to prevent longitudinal movement of said link when said seat is in said unfolded seat-defining position, a pair of armrests, each of said armrests being pivotally mounted on one of said side members, each of said armrests being connected to one of said links so that pivotal movement of said armrests effects longitudinal movement of said links, each of said links being generally vertically disposed and provided with an upwardly facing surface, said locking means including a locking bar pivotally mounted on each of said side members, each locking bar being provided with a surface engageable with said upwardly facing surface of its adjacent link and being swingable to a locking position in which said surface of said locking locking bar engages and bears downwardly upon said upwardly facing surface of said link when said locking pins movable by said links are fully inserted in said slots, and means on said seat engage and swing said locking bar into said locking position as said seat is pivoted to its unfolded position.