Abstract: A handbrake operating device is provided. The handbrake operating device contains a positioning seat and an operating lever. The positioning seat has a tubular portion on one end for fitting a curved handlebar. The positioning seat has a connection slot on the other end allowing the brake wire to pass through. The handbrake operating device is designed such that the brake wire goes nearly straight between the handbrake operating device and the brake device of the vehicle. As the brake wire is not bended with any abrupt angle and remains in a tensed condition, the brake device of the vehicle would quickly and sensitively respond to the handbrake operating device.

Abstract: A U-type bicycle handbrake assembly structure is provided so that the brake arms could be quickly and easily positioned. The invention cuts a planar surface on the fitting tube welded to the bicycle frame. The planar surface is parallel to the brake pad's contact surface to the wheel rim. The invention then configures a protruding plate on the adjusting seat along the adjusting seat's axial direction. When a brake arm is pin-joined to the fitting tube of the bicycle frame, the brake arm could be positioned quickly and easily by arranging the axial protruding plate of the adjusting seat to match against the planar surface of the fitting tube.

Abstract: A bike cantilever brake arm having a sleeve fixed to the brake arm through an axle bore provided at the bottom of the brake arm; a scroll section of the rod spring being inserted to a ring provided on one side of the sleeve and covered with a cap; a locking ring is provided on one side of the sleeve to receive insertion of a rubber ring from the opposite side of the adjustment base; a slot and a hooking section being provided on one end of the rubber ring to merely engage the locking ring of the sleeve; another end of the rubber ring extending a retaining edge to retain the adjustment base; and the brake arm, the cap, the rod spring and the adjustment base all being ex-factory made in one piece to keep them integral during transition and the subsequent assembly.

Abstract: A brake lever device includes a handle having a lever pivotally coupled to the base. The lever includes a groove and two or more notches communicating with the groove. A cable coupler includes a rod slidably engaged in the groove and to be engaged with either of the notches. A post is rotatably engaged in the lever and has a notch for allowing the rod to be moved to engage with the other notch when the notch is faced toward the notches. The rod may be stably retained in the notches when the notch of the post is faced away from the notches.

Abstract: A brake lever includes a bracket having a shaft disposed in the middle portion. A brake handle has a grip and an arm joined at their proximal ends. The arm includes a lower portion engaged with the shaft and includes a groove and two orifices for engaging with a barrel of a brake cable. One of the orifices is located between the other orifice and the shaft, and moves for a shorter distance than the other orifice when the arm is rotated about the shaft, such that the leverage of the brake lever can be adjusted.

Abstract: A brake device for a bicycle includes a brake arm and a stud pivotally coupled to the brake arm. The stud includes a ring and a head formed in one end. A casing has an opening and a notch formed in each of the two ends. The ring is rotatably engaged in one of the opening for allowing the casing to be rotatably coupled to the stud. An elbow has an extension for rotatably engaging in the other opening and for allowing the elbow to be rotatable about the extension such that the brake device may be attached to different place of the bicycle.

Abstract: A brake lever mechanism including a bracket having a shaft disposed in the middle portion. A brake handle has a grip and an arm joined at their proximal ends. The arm includes a lower portion engaged with the shaft and includes a groove and two recesses. One of the recesses is located closer to the shaft than the other recess such that the recess may move for a farther distance than the other recess relative to the shaft when the arm is rotated about the shaft, and such that the leverage of the brake lever can be adjusted.

Abstract: A tension device is secured to a derailleur system of a bicycle having a frame pivotally coupled to the bicycle for supporting a sprocket and for engaging with a chain. The tension device includes an arm having one end secured to the bicycle and having the other end secured to an auxiliary spring. A block is secured to the frame and has an extension secured to the other end of the spring. The spring may bias the frame and may tension the frame and the chain for preventing the chain from disengaging from the derailleur system.