Frame for folding bicycle

Abstract

Abstract A frame for a holding bicycle comprising: a base frame having a triangular side elevation arranged such that a hanger pipe 2 and a hanger bracket 3 are provided at the lower end of a main pipe 1, while a front bracket 6 is provided at the upper end, and said hanger bracket 3 and a rear end member 8 as well as said front bracket 6 and said rear end member 8 are connected with a pair of back forks 9 and a pair of lower stays 10 respectively; a quadric limited link frame arranged such that the lower end of a seat pipe 11 is rotatably attached to a shaft 5 provided to said hanger bracket 3 provided at the upper end of said main pipe 1 defining one side of said base frame having a triangular side elevation, while an upper bracket 13 is provided near the upper end of said seat pipe 11, and the lower end of a front pipe 15 is rotatably attached to a shaft 7 provided to said front bracket 6 provided at the lower end of said main pipe 1, while a head bracket 17 is provided close to the upper end of said front pipe 15, and shafts 14, 18 provided to said upper bracket 13 and said head bracket 17 respectively are connected with an upper stay 20, thereby to foldably constitute said quadric limited link frame from said main pipe 1, said seat pipe 11, said upper stay 20 and said front pipe 15; and a link engaged between proper components of said quadric limited link frame and adapted to be bendable and stretchable in order to allow said quadric limited link frame to be unfolded or folded.

Inventors

• 👤 Kikuzo Takamiya
• 👤 Ishibashi Hideyuki

Bibliographic Details