Abstract: A drive chain includes a plurality of outer plates, inner plates and pins. Each outer plate has two outer pivoting holes and two first protruding surfaces. A virtual line connecting the centers of the outer pivoting holes of each outer plate is defined as a first major axis. Each inner plate has two inner pivoting ends and a first protruding portion. A virtual line connecting the centers of the two inner pivoting holes of each inner plate is defined as a second major axis. The first protruding portion has a second protruding surface. Each pin is threaded through two inner plates and two outer plates. An included angle is formed between the first and second major axes. The first protruding surface contacts and overlaps the second protruding surface to form an overlapping region whose area decreases as the included angle decreases.

Abstract: A drive chain includes a plurality of outer plates, inner plates and pins. Each outer plate has two outer pivoting holes and two first protruding surfaces. A virtual line connecting the centers of the outer pivoting holes of each outer plate is defined as a first major axis. Each inner plate has two inner pivoting ends and a first protruding portion. A virtual line connecting the centers of the two inner pivoting holes of each inner plate is defined as a second major axis. The first protruding portion has a second protruding surface. Each pin is threaded through two inner plates and two outer plates. An included angle is formed between the first and second major axes. The first protruding surface contacts and overlaps the second protruding surface to form an overlapping region whose area decreases as the included angle decreases.

Abstract: A sprocket includes a sprocket body, first and second teeth alternatively arranged radially around an outer periphery of the sprocket body, a driving and a non-driving sides respectively defined on the first and second teeth in the driving direction and the non-driving direction, a recess defined between each first tooth and one adjacent second tooth, the first and second teeth each having a first or second tooth tip, a first groove and a second groove respectively extended from sprocket body to the first tooth tips of each two adjacent first teeth and form a thickness of said first teeth, that said first teeth is axially wider than said second teeth. Each first tooth includes two first front chamfers respectively disposed on the said first tooth flank of said two opposite radial surfaces and located on the intersection of said drive side of said each first tooth and said first and second grooves of said sprocket body.

Abstract: A sprocket includes a sprocket body, first and second teeth alternatively arranged radially around an outer periphery of the sprocket body, a driving and a non-driving sides respectively defined on the first and second teeth in the driving direction and the non-driving direction, a recess defined between each first tooth and one adjacent second tooth, the first and second teeth each having a first or second tooth tip, a first groove and a second groove respectively extended from sprocket body to the first tooth tips of each two adjacent first teeth and form a thickness of said first teeth, that said first teeth is axially wider than said second teeth. Each first tooth includes two first front chamfers respectively disposed on the said first tooth flank of said two opposite radial surfaces and located on the intersection of said drive side of said each first tooth and said first and second grooves of said sprocket body.

Abstract: A link plate for a bicycle chain includes an installation hole defined within a circumferential edge thereof The link plate further includes a ridge extending inwardly from a peripheral wall thereof and having a depth smaller than a depth thereof The installation hole defines first and second apertures. The second aperture extends immediately from the first aperture. Furthermore, the first aperture has a diameter “D1”, and the second aperture includes an upper portion having a diameter “D2” and a lower portion having a diameter “D3”. The diameter “D3” is smaller than the diameters “D1” and “D2”. Additionally, the ridge defines two peak portions disposed between the first and second apertures and spaced from each other by a first distance “d1”. The distance “d1” is smaller than the diameters “D1” and “D3”.

Abstract: A link plate for a bicycle chain comprises a plate having a first end and a second end. The first end includes an installation hole and an elongated opening. The installation hole includes a first aperture and a second aperture connected to the first aperture. A peak portion is defined between the first aperture and the second aperture to prevent movement of a pin from the second aperture to the first aperture easily. The elongated opening is connected to the first aperture to expand the installation hole slightly as the pin moves from the first aperture to the second aperture.

Abstract: A link plate assembly includes two first plate, two second plate, and two pins. The first plate includes a first aperture, a second aperture and a receiving aperture. Four convex portions facing the second plate are formed on the first plate. The second plate includes a first aperture and a second aperture. Two concave portions facing the first plate are formed on the second plate. One end of each pin is secured to the first aperture of the first plate. The other end of each pin includes a head portion and a groove portion. The head portion passes through the first aperture of the second plates and the receiving aperture of the other first plate. The groove portion passes through the second aperture of the first plate. The convex portions of the first plates contact with a non-concave part of the second plates when assembling. The convex portions coincide with the concave portions to disassemble the link plate assembly as the second plate is rotated relative to the first plate in a predetermined angle.