Abstract: An adjustment device of an adjustable canopy of a swing set includes a fixed part, an engaging part, and an adjustable part. The fixed part is joined to the frame of a swing set, and has locating hooks. The engaging part is securely connected to the fixed part, and has engaging protrusions on an outer side, which have convexly curved surfaces, and plasticity. The adjustable part, to which a covering part of the canopy is connected, has concavely curved sections spaced around an annular inner side. The locating hooks are connected to the adjustable part such that the adjustable part can turn relative to the fixed part. The concavely curved portions contact the convexly curved protrusions. The inner side of the adjustable part depresses the convexly curved protrusions when force is exerted on the adjustable part so that the canopy covering part can be adjusted.

Abstract: A foldable chair is equipped with a locking mechanism for preventing it from accidentally folding in use, which includes two locking devices each consisting of a co-moving element, and an engaging element. Each of the co-moving elements is pivoted to a corresponding joint, at which the seat of the chair is pivoted to the back, at an upper end, and is pivoted to a corresponding rear support leg of the chair at a lower end so that it is in a substantially vertical position when the chair is moved to stretched position. The engaging elements are secured to corresponding rear support legs, and located at such position that the co-moving elements will engage them respectively when the chair is in the stretched position for use.