Abstract: A belt tensioner for use with a bike is provided. The bike includes a frame and a belt. The frame includes a chain stay and a seat stay having a top surface and bottom surface. The belt tensioner includes a tensioner skeleton, a roller and a tension regulator. The tensioner skeleton is pivotally connected to the chain stay or the seat stay. An included angle is formed between the tensioner skeleton and chain stay or the seat stay. The roller is pivotally connected to the tensioner skeleton and in contact with the belt. The tension regulator presses against the belt to adjust tension of the belt. The tension regulator is disposed at an end of the tensioner skeleton, and the end of the tensioner skeleton is positioned distal to the bottom surface.

Abstract: A latch mechanism includes a first and second latch body. The first and second latch body respectively includes a first and second base, a first and second latch portion and a first and second acting portion. The first latch body disposes through the second base. The second acting portion is pivoted to the second base. The second latch portion is disposed on the rotational path and limited to the first latch portion. The second acting portion includes a first and a second pushing structure. When the second acting portion is rotated along the rotational path, the second latch portion is pushed by the first pushing structure such that the second latch portion is disengaged from the first latch portion, and then the first acting portion is pushed by the second pushing structure such that the first latch body is disengaged from the second latch body in a releasing direction.

Abstract: The bicycle which includes a rear wheel and a frame is disclosed. The frame includes a frame main body and two first supporting platforms. The frame main body includes two supporting parts, a bottom frame and a surrounding part. The two supporting parts are respectively located on the two sides of the rear wheel. The bottom frame is located in front of the rear wheel. The surrounding part is located in back of the rear wheel. The two first supporting platforms are respectively located on the two sides of the rear wheel. Each of the two first supporting platforms includes a side plate and a top plate. The side plate includes a front connecting end and a back connecting end.

Abstract: A belt tensioner for use with a bike is provided. The bike includes a frame and a belt. The frame includes a chain stay and a seat stay having a top surface and bottom surface. The belt tensioner includes a tensioner skeleton, a roller and a tension regulator. The tensioner skeleton is pivotally connected to the chain stay or the seat stay. An included angle is formed between the tensioner skeleton and chain stay or the seat stay. The roller is pivotally connected to the tensioner skeleton and in contact with the belt. The tension regulator presses against the belt to adjust tension of the belt. The tension regulator is disposed at an end of the tensioner skeleton, and the end of the tensioner skeleton is positioned distal to the bottom surface.

Abstract: The bicycle which includes a rear wheel and a frame is disclosed. The frame includes a frame main body and two first supporting platforms. The frame main body includes two supporting parts, a bottom frame and a surrounding part. The two supporting parts are respectively located on the two sides of the rear wheel. The bottom frame is located in front of the rear wheel. The surrounding part is located in back of the rear wheel. The two first supporting platforms are respectively located on the two sides of the rear wheel. Each of the two first supporting platforms includes a side plate and a top plate. The side plate includes a front connecting end and a back connecting end.

Abstract: A latch mechanism includes a first and second latch body. The first and second latch body respectively includes a first and second base, a first and second latch portion and a first and second acting portion. The first latch body disposes through the second base. The second acting portion is pivoted to the second base. The second latch portion is disposed on the rotational path and limited to the first latch portion. The second acting portion includes a first and a second pushing structure. When the second acting portion is rotated along the rotational path, the second latch portion is pushed by the first pushing structure such that the second latch portion is disengaged from the first latch portion, and then the first acting portion is pushed by the second pushing structure such that the first latch body is disengaged from the second latch body in a releasing direction.

Abstract: A clamp device with resilience can be coupled to a slender bar. The slender bar includes a connection rod and a bar shaft which are connected to each other. The clamp device with resilience includes a clamping portion and a fixing portion. The clamping portion includes two clamping plates for containing the connection rod. The fixing portion is connected to the clamping portion and adapted to fix the bar shaft in place. Rotation of the connection rod causes the two clamping plates to abut against polygonal vertices of the connection rod and therefore move away from each other. Therefore, the connection rod rotates by a fixed angle on each instance.

Abstract: A locking structure is applied to a folding frame. The folding frame includes a first frame and a second frame. The first frame includes a first hole. The second frame includes a second hole. The second frame can rotate relative to the first frame to fasten to the first frame. The locking structure includes a case, a first pivoting axis, a second pivoting axis, a fastening column, a connecting column and a third pivoting axis. The case includes a top, a bottom and a container. The first pivoting axis is pivotally connected to the bottom and the first hole. The second pivoting axis is pivotally connected to the second hole. The second pivoting axis includes a fastening groove. The fastening column is located in the container. The connecting column includes a connecting column first end and a connecting column second end.

Abstract: A locking structure is applied to a folding frame. The folding frame includes a first frame and a second frame. The first frame includes a first hole. The second frame includes a second hole. The second frame can rotate relative to the first frame to fasten to the first frame. The locking structure includes a case, a first pivoting axis, a second pivoting axis, a fastening column, a connecting column and a third pivoting axis. The case includes a top, a bottom and a container. The first pivoting axis is pivotally connected to the bottom and the first hole. The second pivoting axis is pivotally connected to the second hole. The second pivoting axis includes a fastening groove. The fastening column is located in the container. The connecting column includes a connecting column first end and a connecting column second end.

Abstract: A clamp device with resilience can be coupled to a slender bar. The slender bar includes a connection rod and a bar shaft which are connected to each other. The clamp device with resilience includes a clamping portion and a fixing portion. The clamping portion includes two clamping plates for containing the connection rod. The fixing portion is connected to the clamping portion and adapted to fix the bar shaft in place. Rotation of the connection rod causes the two clamping plates to abut against polygonal vertices of the connection rod and therefore move away from each other. Therefore, the connection rod rotates by a fixed angle on each instance.