Abstract: A foldable bicycle handlebar includes a fixing base having two holes on a hinge surface, two handlebar grips each having a joint with a hinge hole, an upper fastener fixed to the joints, two shafts passing through holes of the upper fastener, and a slider fixed to the hinge surface. At least one tenon is on a recess that is on a side of each handlebar grip. The hinge holes, and the two holes of the fixing base, and a gap is between the two joints. The slider has an inner surface, a protrusion is extended outwardly from the inner surface to the gap, and a mortise is formed on the inner surface, so that the tenon is inserted into or removed from the mortise. Whether the handlebar grips are unfolded for use or folded for storage, safety and reliability of the foldable bicycle handlebar are ensured.

Abstract: A foldable bicycle crank includes a crank having outer and inner ends, a central shaft passing through two axial holes of the inner end and an axial hole of the outer end, a crank head rotatable around the central shaft by a limited angle, and a slider. A piercing hole is on one side of a flank mortise between the two vertical axial holes. A tenon is formed on a recess at the inner end. A pedal hole and a vertical axial hole are on the crank head, and a tenon is on a recess on the crank head. At least one mortise and a protrusion are formed on the slider. An elastic member is placed into a room on a top portion of the protrusion which can be positioned into or can pass through the piercing hole. A press button in the room pushes against the elastic member.

Abstract: A foldable bicycle crank includes a crank having outer and inner ends, a central shaft passing through two axial holes of the inner end and an axial hole of the outer end, a crank head rotatable around the central shaft by a limited angle, and a slider. A piercing hole is on one side of a flank mortise between the two vertical axial holes. A tenon is formed on a recess at the inner end. A pedal hole and a vertical axial hole are on the crank head, and a tenon is on a recess on the crank head. At least one mortise and a protrusion are formed on the slider. An elastic member is placed into a room on a top portion of the protrusion which can be positioned into or can pass through the piercing hole. A press button in the room pushes against the elastic member.

Abstract: A foldable bicycle handlebar includes a fixing base having two holes on a hinge surface, two handlebar grips each having a joint with a hinge hole, an upper fastener fixed to the joints, two shafts passing through holes of the upper fastener, and a slider fixed to the hinge surface. At least one tenon is on a recess that is on a side of each handlebar grip. The hinge holes, and the two holes of the fixing base, and a gap is between the two joints. The slider has an inner surface, a protrusion is extended outwardly from the inner surface to the gap, and a mortise is formed on the inner surface, so that the tenon is inserted into or removed from the mortise. Whether the handlebar grips are unfolded for use or folded for storage, safety and reliability of the foldable bicycle handlebar are ensured.

Abstract: A speedy pivoting-and-fixing device for a foldable structure includes a structure assembly, a pivot assembly, a base assembly and a pin. The structure assembly has a first structure and a second structure. The pivot assembly has a first pivot and a second pivot formed with axial holes. The first and the second pivots are each formed with a cambered surface at a connected end thereof so that the first and the second structures can be pivoted by 90° and 180° relatively. The base assembly has through-holes corresponding to the axial holes so that, by using bolts, the base assembly can be effectively attached to the pivot assembly or the first and the second pivots can be pivoted into place in a speedy way. The pin is disposed at a side of the first and the second pivot and is adapted to compressively fix the pivot assembly to prevent rotation thereof.

Abstract: The invention is a kind of infrared ray activity pipe. It is made by materials which can radiate infrared ray. The infrared ray activity pipe can be a hollow pipe or can be a hollow pipe with an infrared ray radiative body set on an axis in the chamber of pipe. When fluids flow through the internal channel and contact with the external wall of the pipe, an activity effect will occur to the fluids.