WO2003043875A1 - Rear triangle element for bicycle frames - Google Patents

Rear triangle element for bicycle frames Download PDF

Info

Publication number
WO2003043875A1
WO2003043875A1 PCT/IB2002/004899 IB0204899W WO03043875A1 WO 2003043875 A1 WO2003043875 A1 WO 2003043875A1 IB 0204899 W IB0204899 W IB 0204899W WO 03043875 A1 WO03043875 A1 WO 03043875A1
Authority
WO
WIPO (PCT)
Prior art keywords
element according
seat
fork
mean
chain stay
Prior art date
Application number
PCT/IB2002/004899
Other languages
French (fr)
Inventor
Maurizio Fondriest
Mario Calderoni
Original Assignee
Biciclette Fondriest S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Biciclette Fondriest S.R.L. filed Critical Biciclette Fondriest S.R.L.
Priority to AU2002351017A priority Critical patent/AU2002351017A1/en
Publication of WO2003043875A1 publication Critical patent/WO2003043875A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/04—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity
    • B62K19/06—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/16—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly of plastics

Definitions

  • the present invention relates to bicycle frame elements, and refers to a rear triangle element particularly for high performance bicycle frames.
  • the parts constituting the rear triangle element are made of composite material or material containing fibers of composite material, for instance carbon or glass or boron or Kevlar fibers, these parts are connected by sticking in oven or autoclave.
  • the main drawback of said known rear triangle elements consists in their inadequate capacity to be resistant to local and high strength mechanical stresses, particularly resistant to dynamic bending and torsion stresses of cyclical type.
  • the low resistance is because said elements do not have a uniform and monolithic structure, but they constitute a composed assembly, carried out by connecting three different elements, physically separated the one from the other.
  • the connection is realized through joints, which can be defective, because of the existing divisions among said elements and among the binding fabric layers, or because of material fractures or discontinuities in the weldings.
  • the joint areas usually coincide with the most mechanically stressed sections.
  • Main object of the present invention is to propose a rear triangle element particularly for bicycle frame, carried out by integrating in a monolithic, uniform and regular structure the chain stays, seat stays and the fork ends.
  • Another object is to propose a rear triangle element having high lightness and, at the same time, high structural resistance, fit to resist effectively to every static and dynamic mechanical stress, localized and high intensity, and particularly cyclical bending and torsion stresses.
  • object of the present invention is also to propose an element having a safe and reliable use and a quick and simple realization.
  • figure 1 is an axonometric view of a rear triangle element particularly for bicycles frames object of the present invention, in which some parts have been removed for better underlining others;
  • - figure 2 shows a side view of the figure 1 element;
  • figure 3 shows a plant view of the figure 2 element;
  • figures 4 and 5 show section views according to section planes rV-IV and V-V of figure
  • figure 6 shows a partial side view of the figure 1 element in association with fork insert
  • - figure 7 shows a partial side view of a first variant of figure 6 element
  • figure 8 shows a partial side view of a second variant of the figure 1 element.
  • the reference 1 indicates a rear triangle element particularly for bicycles frames essentially constituted by chain stay mean 2, a fork end 3 and a seat stay mean 4.
  • the element 1 is characterized by a portion of the seat stay mean 4 carried out as single body with the chain stay mean 2 and the fork end 3, by means of one or more fabric layers 20 in composite material soaked of binding material and without solution of continuity of the fibers of said fabric layers.
  • the latter includes carbon, boron, glass or Kevlar fibers, while the binding material consists of an epoxy or polyurethane resin.
  • the portion of the seat stay mean 4 has a length ranging between two centimeters and the total length of seat stay.
  • the chain stay 2 and seat stay 4 means are tubular, longitudinally extended with predefined inner shape and are tapered with solid flat section in correspondence of the fork end 3. Said means further have dimensions and shape of the transversal section which vary along the longitudinal extension.
  • the transversal sections can have circular, elliptical, rectangular or prismatic shape.
  • the chain stay mean 2 has longitudinal curvilinear extension having two flex points, which indicate bending changes, defining a flat S shaped profile of the mean.
  • the chain stay mean 2 has, in correspondence of an intermediary portion thereof, a side protrusion 6 having an approximately triangular shape with a convex side and two concave sides joined by curved portions. Said protrusion is fit for the bending and torsion transversal stiffening of the chain stay mean 2.
  • the fork end has solid and flat section and has a fork seat 10, namely a rear dropout, for a wheel hub and a shaped seat 5, carried out in correspondence of said fork seat 10.
  • a fork insert 1 made of metal, for instance aluminum alloy, is inserted in the fork seat 10 and fixed against the shaped seat 5. In alternative, the insert can also mate the side wall 14 of the attack 3, opposed to the shaped center 5.
  • the fixing of the fork insert 7 to the fork end 3 is realized by sticking.
  • the fork insert 7 has through holes 9 which mate the side walls of the fork end 3 and are fit for making easier the sticking.
  • the fork insert 7 includes an extension 8, having a through seat 11, for instance a hole, fit for accommodating transmission means of the bicycle, for instance derailleur gears.
  • a second variant of the rear triangle element shown in figure 8, has a wall 12 of mutual union between the portion of the seat stay mean 4 and the chain stay mean 2, for a further stiffening of said element and to provide aerodynamic improvement of the rear triangle element.
  • the main advantage of the present invention is to provide a rear triangle element particularly for bicycle frames, carried out integrating in a monolithic, uniform and regular structure the chain stays, seat stays and the fork ends.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Paper (AREA)

Abstract

A rear triangle element particularly for bicycle frames, including a chain stay mean (2) and a fork end (3), has at least a portion of a seat stay mean (4), carried out as a single body with the chain stay mean (2) and the fork end (3). The portion of the seat stay mean (4), the chain stay mean (2) and the fork end (3) are constituted by at least a fabric layer (20) in composite material, soaked with binding material and without solution of continuity of the fibers of the at least fabric layer (20).

Description

REAR TRIANGLE ELEMENT FOR BICYCLE FRAMES
TECHNICAL FIELD
The present invention relates to bicycle frame elements, and refers to a rear triangle element particularly for high performance bicycle frames.
BACKGROUND ART
There are known rear triangle elements for bicycle frames essentially carried out by joining three individual and separate parts: a hub connection or fork end, fit for receiving the wheel axis and two extended connection parts with the bicycle frame, respectively called seat stays and chain stays. Said stays usually are of tubular type, with circular or elliptical section.
If the parts constituting the rear triangle element are made of composite material or material containing fibers of composite material, for instance carbon or glass or boron or Kevlar fibers, these parts are connected by sticking in oven or autoclave.
If said parts are made of metal, for instance steel or aluminum alloy, welding carries out the connections.
The main drawback of said known rear triangle elements consists in their inadequate capacity to be resistant to local and high strength mechanical stresses, particularly resistant to dynamic bending and torsion stresses of cyclical type. The low resistance is because said elements do not have a uniform and monolithic structure, but they constitute a composed assembly, carried out by connecting three different elements, physically separated the one from the other. The connection is realized through joints, which can be defective, because of the existing divisions among said elements and among the binding fabric layers, or because of material fractures or discontinuities in the weldings. The joint areas usually coincide with the most mechanically stressed sections.
Other drawback of said known elements consists in the limited stiffness of the seat and chain stays. Particularly, the chain stays being subject to high bending and torsion forces, caused by the chain traction during the pedal stroke, are cyclically bent, determining a noticeable transversal oscillation of the rear wheel supported by the fork and, thus, an irregular behavior of the frame. Said cyclical bending stresses further cause frequent break and structural fatigue collapses of the elements.
DISCLOSURE OF THE INVENTION
Main object of the present invention is to propose a rear triangle element particularly for bicycle frame, carried out by integrating in a monolithic, uniform and regular structure the chain stays, seat stays and the fork ends.
Other object is to propose a rear triangle element having high lightness and, at the same time, high structural resistance, fit to resist effectively to every static and dynamic mechanical stress, localized and high intensity, and particularly cyclical bending and torsion stresses.
Further object is to propose a rear triangle element having high bending and torsion stiffness, particularly of the chain stays.
Other object of the present invention is also to propose an element having a safe and reliable use and a quick and simple realization.
The above-mentioned objects are achieved according to the content of the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The characteristics of the invention are underlined in the following, with particular reference to the attached drawings, in which:
figure 1 is an axonometric view of a rear triangle element particularly for bicycles frames object of the present invention, in which some parts have been removed for better underlining others; - figure 2 shows a side view of the figure 1 element; figure 3 shows a plant view of the figure 2 element; figures 4 and 5 show section views according to section planes rV-IV and V-V of figure
3, respectively; - figure 6 shows a partial side view of the figure 1 element in association with fork insert; - figure 7 shows a partial side view of a first variant of figure 6 element; figure 8 shows a partial side view of a second variant of the figure 1 element.
BEST MODE OF CARRYING OUT THE INVENTION
With reference to figures from 1 to 5, the reference 1 indicates a rear triangle element particularly for bicycles frames essentially constituted by chain stay mean 2, a fork end 3 and a seat stay mean 4.
The element 1 is characterized by a portion of the seat stay mean 4 carried out as single body with the chain stay mean 2 and the fork end 3, by means of one or more fabric layers 20 in composite material soaked of binding material and without solution of continuity of the fibers of said fabric layers. The latter includes carbon, boron, glass or Kevlar fibers, while the binding material consists of an epoxy or polyurethane resin.
The portion of the seat stay mean 4 has a length ranging between two centimeters and the total length of seat stay.
The chain stay 2 and seat stay 4 means are tubular, longitudinally extended with predefined inner shape and are tapered with solid flat section in correspondence of the fork end 3. Said means further have dimensions and shape of the transversal section which vary along the longitudinal extension. The transversal sections can have circular, elliptical, rectangular or prismatic shape.
Particularly, the chain stay mean 2 has longitudinal curvilinear extension having two flex points, which indicate bending changes, defining a flat S shaped profile of the mean.
The chain stay mean 2 has, in correspondence of an intermediary portion thereof, a side protrusion 6 having an approximately triangular shape with a convex side and two concave sides joined by curved portions. Said protrusion is fit for the bending and torsion transversal stiffening of the chain stay mean 2.
The fork end has solid and flat section and has a fork seat 10, namely a rear dropout, for a wheel hub and a shaped seat 5, carried out in correspondence of said fork seat 10. A fork insert 1, made of metal, for instance aluminum alloy, is inserted in the fork seat 10 and fixed against the shaped seat 5. In alternative, the insert can also mate the side wall 14 of the attack 3, opposed to the shaped center 5.
The fixing of the fork insert 7 to the fork end 3 is realized by sticking.
It is provided that the fork insert 7 has through holes 9 which mate the side walls of the fork end 3 and are fit for making easier the sticking.
In figure 7 it is shown a first variant of the element object of the present invention, in which the fork insert 7 includes an extension 8, having a through seat 11, for instance a hole, fit for accommodating transmission means of the bicycle, for instance derailleur gears.
A second variant of the rear triangle element, shown in figure 8, has a wall 12 of mutual union between the portion of the seat stay mean 4 and the chain stay mean 2, for a further stiffening of said element and to provide aerodynamic improvement of the rear triangle element.
It is provided a third variant of the rear triangle element, in which a pin 13 is inserted in the seat stay mean 4 portion in order to engage a corresponding upper portion of the seat stay mean 4, not shown in the figures.
The main advantage of the present invention is to provide a rear triangle element particularly for bicycle frames, carried out integrating in a monolithic, uniform and regular structure the chain stays, seat stays and the fork ends.
Other advantage is to provide a rear triangle element having high lightness and, at the same time, high structural resistance, fit to resist effectively to every static and dynamic mechanical stress, localized and high intensity, and particularly cyclical bending and torsion stresses.
Further advantage is to provide a rear triangle element having high bending and torsion stiffness, particularly of the chain stays.
Other advantage of the present invention is also to provide an element having a safe and reliable use and a quick and simple realization.

Claims

1) Rear triangle element particularly for bicycles frames including a chain stay mean (2) and a fork end (3), said element (1) being characterized in that has at least a portion of a seat stay mean (4) carried out as single body with the chain stay mean (2) and the fork end (3).
2) Element according to claim 1 characterized in that at least a portion of the seat stay mean (4), the chain stay mean (2) and the fork end (3) are constituted by at least a fabric layer (20) in composite material soaked with binding material and without solution of continuity of the fibers of the at least fabric layer (20).
3) Element according to claim 1 characterized in that the fork end (3) is provided with a fork seat (10) for a wheel hub.
4) Element according to claim 1 characterized in that at least the portion of a seat stay mean (4) has a length ranging between two centimeters and the total length of the seat stay.
5) Element according to claim 1 characterized in that that the chain stay (2) and seat stay (4) means are tubular, longitudinally extended, with predefined inner shape and they are tapered with solid and flat section in correspondence of the fork end (3).
6) Element according to claim 1 characterized in that the chain stay mean (2) has S shaped longitudinal curvilinear extension.
7) Element according to claim 2 characterized in that the chain stay mean (2) has dimensions and shape of the transversal section varying along the longitudinal extension.
8) Element according to claim 2 characterized in that the seat stay mean (4) has dimensions and shape of the transversal section varying along the longitudinal extension.
9) Element according to claim 2 characterized in that the chain stay mean (2) has a side protrusion (6) in correspondence of an intermediary portion thereof for the bending and torsion transversal stiffening of said chain stay mean (2).
10) Element according to claim 9 characterized in that the transversal section of the side protrusion (6) has an approximately triangular shape with a convex side and two concave sides joined by curved portions.
11) Element according to claim 2 characterized in that the seat stay (2) and the chain stay (4) means have transversal section of circular, elliptical, rectangular or prismatic shape.
12) Element according to claim 1 characterized in that the fork end (3) has solid and flat section.
13) Element according to claim 1 characterized in that the fork end (3) includes a shaped seat (5), carried out in correspondence of the fork seat (10).
14) Element according to claim 1 characterized in that includes a fork insert (7) inserted in the fork seat (10) and fixed against at least the shaped seat (5).
15) Element according to claim 1 characterized in that the fork insert (7) is fixed by sticking.
16) Element according to claim 13 characterized in that the fork insert (7) has at least a through hole (9) mating the fork end (3), fit for making easier the sticking.
17) Element according to claim 13 characterized in that the fork insert (7) has at least an extension (8), having at least a through seat (11) fit for transmission means of the bicycle.
18) Element according to any of the claims from 11 to 14 characterized in that the fork insert (7) is made of metal.
19) Element according to claim 1 characterized in that the fabric (20) includes carbon, boron, glass or Kevlar fibers and the binding material consists of epoxy or polyurethane resin. 20) Element according to claim 1 characterized in that at least a portion of the seat stay mean (4) and the chain stay mean (2) have a wall (12) of mutual union.
21) Element according to claim 1 characterized in that includes a pin (13) inserted into at least a portion of the seat stay mean (4).
PCT/IB2002/004899 2001-11-23 2002-11-22 Rear triangle element for bicycle frames WO2003043875A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002351017A AU2002351017A1 (en) 2001-11-23 2002-11-22 Rear triangle element for bicycle frames

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001BO000719A ITBO20010719A1 (en) 2001-11-23 2001-11-23 REAR CARRIAGE ELEMENT PARTICULARLY FOR CYCLES
ITBO2001A000719 2001-11-23

Publications (1)

Publication Number Publication Date
WO2003043875A1 true WO2003043875A1 (en) 2003-05-30

Family

ID=11439702

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2002/004899 WO2003043875A1 (en) 2001-11-23 2002-11-22 Rear triangle element for bicycle frames

Country Status (3)

Country Link
AU (1) AU2002351017A1 (en)
IT (1) ITBO20010719A1 (en)
WO (1) WO2003043875A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833242A (en) * 1972-12-29 1974-09-03 Original Plastic Bike Bicycle frame
US4900048A (en) * 1987-10-02 1990-02-13 Gleb Derujinsky Integral seamless composite bicycle frame
US5269551A (en) * 1991-02-07 1993-12-14 Martin Pierre A Cycle frame
EP0685386A1 (en) * 1994-06-02 1995-12-06 Pai, Chin-dong Adapter fitting for the selective connection of a radiator to a one- or a two pipe system
US6267399B1 (en) * 1994-08-22 2001-07-31 Advanced Composites, Inc. Net shape filament winding manufacturing process, articles made therefrom and composite bicycle fork and other components

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833242A (en) * 1972-12-29 1974-09-03 Original Plastic Bike Bicycle frame
US4900048A (en) * 1987-10-02 1990-02-13 Gleb Derujinsky Integral seamless composite bicycle frame
US5269551A (en) * 1991-02-07 1993-12-14 Martin Pierre A Cycle frame
EP0685386A1 (en) * 1994-06-02 1995-12-06 Pai, Chin-dong Adapter fitting for the selective connection of a radiator to a one- or a two pipe system
US6267399B1 (en) * 1994-08-22 2001-07-31 Advanced Composites, Inc. Net shape filament winding manufacturing process, articles made therefrom and composite bicycle fork and other components

Also Published As

Publication number Publication date
ITBO20010719A0 (en) 2001-11-23
AU2002351017A1 (en) 2003-06-10
ITBO20010719A1 (en) 2003-05-23

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