DETACHABLE CHAIR BACK

摘要

An improved locking mechanism for detachably securing a seat back to a chair frame is disclosed. The improved locking mechanism includes a pair of side brackets secured to opposite sides of the seat back. Linkages supported from the chair frame are provided for receiving the slide brackets thereon for supporting the seat back on the chair frame in a predetermined orientation relative to the seat member. A moveable locking arm is supported from the slide brackets and includes an offsetarcuate cam surface which is adapted to engage an arcuate notch formed on the linkage when the locking arm is moved to a locked position. The mating engagement of the arcuate offset cam surface within the arcuate notch generates a line-of-contact therebetween which inhibits relative movement between the slide brackets and theupstanding links for rigidly securing seat member to the chair frame. An alternative embodiment discloses a modified link member which is adapted to create an interference engagement with the slide bracket to augment the locking action of the arcuate cam surface within the arcuate notch.