Composite Carbon Fiber Bicycle Crank and Its Method of manufacture

Abstract

A method of manufacture of forming a composite carbon fiber bicycle crank includes providing a hollow carbon fiber body, with the body including a first opening at one end and the second opening at the other end, mounting a first connecting member and a second connecting member in the first opening and the second opening of the body respectively, wrapping carbon fiber yarn made up of carbon yarn around the assembly of the body and the first and second connecting members, wrapping carbon fiber polymer, and performing hot embossing.

1 . A method of manufacture of forming a composite carbon fiber bicycle crank comprising:
 providing a hollow carbon fiber body, with the body including a first opening at one end and the second opening at the other end, mounting a first connecting member and a second connecting member in the first opening and the second opening of the body respectively, wrapping carbon fiber yarn around the assembly of the body and the first and second connecting members, wrapping carbon fiber polymer, and conducting hot embossing.   
   
   
       2 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 1  includes mounting a five fastening fingers to the assembly of the body and the connecting members. 
   
   
       3 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 1  wherein the body includes a first groove and a second groove recessed into the outer wall thereof, with the first groove and the second groove being intercrossed, and with the first groove and the second groove extending from the first opening to the second opening. 
   
   
       4 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 2  wherein the body includes a first groove and a second groove recessed into the outer wall thereof, with the first groove and the second groove being intercrossed, and with the first groove and the second groove extending from the first opening to the second opening. 
   
   
       5 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 1  wherein the first connecting member includes a locking rib extending radially from the periphery thereof the second connecting member includes a locking rib extending radially from the periphery thereof, wherein the locking rib of the first connecting member prevents the first connecting member from moving with respect to the body, the locking rib of the second connecting member prevents the second connecting member from moving with respect to the body. 
   
   
       6 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 2  wherein the first connecting member includes a locking rib extending radially from the periphery thereof the second connecting member includes a locking rib extending radially from the periphery thereof, wherein the locking rib of the first connecting member prevents the first connecting member from moving with respect to the body, the locking rib of the second connecting member prevents the second connecting member from moving with respect to the body. 
   
   
       7 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 1  wherein the first connecting member includes a plurality of protrusions extending radially from the periphery thereof, the second connecting member includes a plurality protrusions extending radially from the periphery thereof, the protrusions of the first connecting member are arranged circumferentially and symmetrically, with a passage being defined between the protrusions, the carbon fiber yarn being arranged at 0 degree, with the carbon fiber yarn being wrapped around the first and second grooves, the protrusions and the passage of the first connecting member and the protrusions of the second connecting member. 
   
   
       8 . The method of manufacture of forming a composite carbon fiber bicycle crank as claimed in  claim 2  wherein the first connecting member includes a plurality of protrusions extending radially from the periphery thereof the second connecting member includes a plurality protrusions extending radially from the periphery thereof the protrusions of the first connecting member are arranged circumferentially and symmetrically, with a passage being defined between the protrusions, the carbon fiber yarn is arranged at  0  degree, with the carbon fiber yarn being wrapped around the first and second grooves, the protrusions and the passage of the first connecting member and the protrusions of the second connecting member. 
   
   
       9 . A composite carbon fiber bicycle crank comprising:
 a hollow carbon fiber body, with the body including a first opening at one end and the second opening at the other end;   a first connecting member disposed in the first opening and a second connecting member disposed in the second opening;   carbon fiber yarn is disposed on the outer wall of the body and the first and second connecting members around the periphery thereof, carbon fiber polymer is disposed over the said carbon fiber yarn.   
   
   
       10 . A composite carbon fiber bicycle crank as claimed in  claim 9  includes a five fastening fingers connected to the body at one end; 
   
   
       11 . A composite carbon fiber bicycle crank as claimed in  claim 9  wherein the body includes a first groove and a second groove recessed into the outer surface thereof, with the first and second grooves being intercrossed, and with the groove extending from the first opening to the second opening. 
   
   
       12 . A composite carbon fiber bicycle crank as claimed in  claim 10  wherein the body includes a first groove and a second groove recessed into the outer surface thereof, with the first and second grooves being intercrossed, and with the groove extending from the first opening to the second opening. 
   
   
       13 . A composite carbon fiber bicycle crank as claimed in  claim 9  wherein the first connecting member includes a locking rib extending radially from the periphery thereof, the second connecting member includes a locking rib extending radially from the periphery thereof, wherein the locking rib of the first connecting member prevents the first connecting member from moving with respect to the body, the locking rib of the second connecting member prevents the second connecting member from moving with respect to the body. 
   
   
       14 . A composite carbon fiber bicycle crank as claimed in  claim 10  wherein the first connecting member includes a locking rib extending radially from the periphery thereof, the second connecting member includes a locking rib extending radially from the periphery thereof, wherein the locking rib of the first connecting member prevents the first connecting member from moving with respect to the body, the locking rib of the second connecting member prevents the second connecting member from moving with respect to the body. 
   
   
       15 . A composite carbon fiber bicycle crank as claimed in  claim 9  wherein the first connecting member includes a plurality of protrusions extending radially from the periphery thereof; the second connecting member includes a plurality protrusions extending radially from the periphery thereof, the protrusions of the first connecting member are arranged circumferentially and symmetrically, with a passage being defined between the protrusions, the carbon fiber yarn is arranged at 0 degree, with the carbon fiber yarn being wrapped around the first and second grooves, the protrusions and the passage of the first connecting member and the protrusions of the second connecting member. 
   
   
       16 . A composite carbon fiber bicycle crank as claimed in  claim 10  wherein the first connecting member includes a plurality of protrusions extending radially from the periphery thereof, the second connecting member includes a plurality protrusions extending radially from the periphery thereof, the protrusions of the first connecting member are arranged circumferentially and symmetrically, with a passage being defined between the protrusions, the carbon fiber yarn is arranged at 0 degree, with the carbon fiber yarn being wrapped around the first and second grooves, the protrusions and the passage of the first connecting member and the protrusions of the second connecting member.