Abstract: A flexible stick of a bow exercise device includes a base and a top cap, and a first and second flexible plates are connected between the base and the top cap. Two ends of the first flexible plate are respectively connected to the base and the top cap. A first end of the second flexible plate is connected to the base and a second end of the second flexible plate is movably inserted in a slot defined in the top cap. A gap is defined between the first and second flexible plates when the stick is not bent. The top cap can be removed from the two flexible plates and the second flexible plate can be replaced with another one with different flexibility.

Abstract: A flexible stick of a bow exercise device includes a base and a top cap, and a first and second flexible plates are connected between the base and the top cap. Two ends of the first flexible plate are respectively connected to the base and the top cap. A first end of the second flexible plate is connected to the base and a second end of the second flexible plate is movably inserted in a slot defined in the top cap. A gap is defined between the first and second flexible plates when the stick is not bent. The top cap can be removed from the two flexible plates and the second flexible plate can be replaced with another one with different flexibility.

Abstract: An umbrella includes a shaft with a runner movably mounted thereto and a first cap and a second cap are respectively connected to a top end of the shaft. The first cap is located closer than the second cap to the second end of the shaft. A plurality of first ribs pivotably connected to the second end cap and a main panel is mounted to the first ribs. The main panel has a hole with a center at the shaft. Each first rib has a join connected thereto and each joint having a first passage through which the first rib extends and a second passage through which one of second ribs extends. Each second rib has a first end thereof pivotably connected to the first cap and a section of the second end of each of the second ribs is overlapped on the main panel. A sub-panel is attached to the second ribs and covers the hole in the main panel. A plurality of stretchers are pivotably connected between the runner and the joints.

Abstract: A method for making a squeeze loop includes step of preparing pre-preg yarns and wrapping the yarns to a mandrel; step of solidifying the yarns and removing the mandrel from the yarns which forms a tube; step of cutting the tube into loops, and step of wrapping the loops with an outer layer made of flexible material.

Abstract: A method for making a squeeze loop includes step of preparing pre-preg yarns and wrapping the yarns to a mandrel; step of solidifying the yarns and removing the mandrel from the yarns which forms a tube; step of cutting the tube into loops, and step of wrapping the loops with an outer layer made of flexible material.

Abstract: A stretcher or rib of an umbrella is made of compound material and a cap has a tube in which an end of the stretcher or rib is inserted. A metal collar is mounted to the tube and rolled to deform inward to clamp the tube and the stretcher or rib together. A joint has a tube and the stretcher or rib extends through the joint and the tube. A metal collar is mounted to the tube and rolled to deform inward to clamp the tube of the joint and the stretcher or rib together.