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AbstractA generally hollow bicycle frame of resin impregnated fibrous material having a main tubular beam and cross tubular portions as required by single seat and dual seat bicycle frames. At the rearmost end of the main tubular beam is a cross tubular portion providing an upstanding seat support post and a downstanding pedal support post, and having a rearwardly and downwardly extending V-shaped rear wheel support member affixed to the seat support upwardly of the main tubular beam. For the dual seat frame, an additional cross tubular portion is provided intermediate the ends of the main beam, providing an upstanding front seat support and a downstanding front pedal support post. The frame is constructed of an innermost shell of fibrous material impregnated in synthetic resin and an outer layer of similar material. The junctions of the seat and pedal support post with the main tubular beam portion are strengthened by the main beam innermost shell extending continously, unbrokenly, through the junction. The innermost shells are constructed using male mandrels removed after vacuum bag cure of the shells. Subsequently, the innermost shell components are bonded together and overwrapped and overlaid with the outermost layer, serving thereafter as a mandrel for vacuum bag cure of the outermost layer, bonding it integrally to the innermost shells. | InventorApplicationNo. 804445 filed on 12/10/1991US Classes:280/231, Plural occupant propelled74/502.6, Specific cable connector or guide264/512, Producing hollow work or a tubular article280/273, Plural occupant280/274, Frames and running gear280/281.1, Frames and running gear280/288.1Low profileField of Search280/231, Plural occupant propelled280/273, Plural occupant280/274, Frames and running gear280/281.1, Frames and running gear280/288.3, Hollow shell frames264/512, Producing hollow work or a tubular article264/511Including application of vacuum to hold, support, or sustain a preform against which material is moldedExaminersPrimary: Focarino, Margaret A.Assistant: Hurley, Kevin Attorney, Agent or FirmUS Patent References4657795, Tubular material based on a fabric-reinforced resin, and a bicycle or similar vehicle frame constructed with such a materialIssued on: 04/14/1987 Inventor: Foret4889355, Composite bicycle frames and methods of making same Issued on: 12/26/1989 Inventor: Trimble4900048, Integral seamless composite bicycle frame Issued on: 02/13/1990 Inventor: Derujinsky4902458, Method of molding composite bicycle frames Issued on: 02/20/1990 Inventor: Trimble4923203, Composite bicycle frame with crossed tubular portions Issued on: 05/08/1990 Inventor: Trimble, et al.5011172, Lightweight bicycle with improved front and rear wheel fork and method of constructing same Issued on: 04/30/1991 Inventor: Bellanca, et al.5013514, Process for the construction of hollow monolithic elements of composite material, particularly carbon fibres Issued on: 05/07/1991 Inventor: Azzani, et al.5054802Bicycle frame Issued on: 10/08/1991 Inventor: Smith Foreign Patent References
International ClassB62M 001/00 |