US20030172532A1 - Method for making hollow bicycle cranks - Google Patents

Method for making hollow bicycle cranks Download PDF

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Publication number
US20030172532A1
US20030172532A1 US10/097,578 US9757802A US2003172532A1 US 20030172532 A1 US20030172532 A1 US 20030172532A1 US 9757802 A US9757802 A US 9757802A US 2003172532 A1 US2003172532 A1 US 2003172532A1
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United States
Prior art keywords
prototype
mold
cone
shaped passage
forging
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Granted
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US10/097,578
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US6612033B1 (en
Inventor
Cheng-Xun Jiang
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Individual
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Priority to US10/097,578 priority Critical patent/US6612033B1/en
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Publication of US6612033B1 publication Critical patent/US6612033B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/14—Making other products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/063—Making machine elements axles or shafts hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/08—Making machine elements axles or shafts crankshafts
    • 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
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49622—Vehicular structural member making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material
    • Y10T29/49996—Successive distinct removal operations

Definitions

  • the present invention relates to a method for making a hollow bicycle crank and the method uses various of molds to quickly manufacture the bicycle crank.
  • a conventional bicycle crank includes two main types one of which is solid crank and the other is hollow crank.
  • the solid crank is too heavy and needs lots of material so that it is not satisfied by the manufacturers and the customers.
  • the hollow crank is welcomed by the market, however, it takes a long period of time to proceed and includes the steps of forging, rolling, welding and cold forging. The step of rolling especially takes a long time to finish the process. How to develop a proper method to make a hollow crank at a low cost is a concern for the manufacturers.
  • the present invention relates to a method for making a hollow bicycle crank and comprises a step of forging a piece by putting a piece between a first mold and a second mold. An opening is defined between the first mold and the second mold. A third mold is inserted in the opening by its prong to make a recess in a first end of the piece which becomes a prototype.
  • a step of forming a hollow first end of the crank by putting the first end of the forged prototype in step into a cone-shaped passage in a fourth mold.
  • a pushing member forces the first end of the prototype to go through the cone-shaped passage from a wide opening to a narrow opening of the cone-shaped passage so as to seal the recess.
  • thermo-forming by putting the first end of the prototype in a mold under heat and deforming the first end to have an angle relative to a second end of the prototype.
  • a step of setting the shape of the prototype by putting the first end of the prototype in a cold-forging mold.
  • FIG. 1 shows the step of three-direction forging of the method of the present invention
  • FIG. 2 shows a pushing member to push the first end of the prototype through a cone-shaped passage of a mold
  • FIG. 3 shows the pushing member and the mold with the cone-shaped passage
  • FIG. 4 shows that the first end of the prototype is sealed after being pushed through the cone-shaped passage of the mold
  • FIG. 5 shows the first end of the prototype is formed an angle by the thermo-forging mold
  • FIG. 6 shows a mold to set the shape of the first end of the piece
  • FIG. 7 is an exploded view to show the prototype and accessories to be connected to the prototype.
  • the method for making a hollow bicycle crank of the present invention comprises a step of three-direction forging: forging a piece 1 by putting a piece 1 between a first mold 2 and a second mold 20 .
  • An opening 22 is defined between the first mold 2 and the second mold 20 .
  • a third mold 21 has a prong 210 which is inserted in the opening 22 to make a recess 10 in a first end of the piece which becomes a prototype 3 .
  • a step of forming a hollow first end of the crank putting the first end of the prototype 3 into a cone-shaped passage 40 in a fourth mold 4 .
  • the cone-shaped passage 40 includes a wide opening and a narrow opening.
  • a pushing member 5 forces the first end of the prototype 3 to go through the cone-shaped passage 40 from the wide opening to the narrow opening of the cone-shaped passage 40 .
  • the material at the inner periphery of the recess 10 is forced to come to each other and the recess 10 is then sealed when the first end of the prototype 3 passes through the narrow opening of the cone-shaped passage 40 .
  • thermo-forming putting the first end of the prototype 3 in a mold 6 under heat and deforming the first end to have an angle relative to a second end of the prototype 3 .
  • a step of setting putting the first end of the prototype 3 in a cold-forging mold 7 to set the shape of the prototype 3 .
  • a hollow crank 8 is made within a short period of time and two ends of the crank 8 are drilled to have threaded holes to be connected with accessories.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Forging (AREA)

Abstract

A method for making a hollow crank includes a three-direction forging step to forge a piece to have a recess in a first end of the prototype; a step of forming a hollow first end of the prototype by forcing the first end through a cone-shaped passage in a mold; a step of forming the first end of the prototype to have an angle relative to the second end of the prototype; a step of setting the first end of the prototype in a cold-forging mold to set the shape of the prototype.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a method for making a hollow bicycle crank and the method uses various of molds to quickly manufacture the bicycle crank. [0001]
    • BACKGROUND OF THE INVENTION
  • A conventional bicycle crank includes two main types one of which is solid crank and the other is hollow crank. The solid crank is too heavy and needs lots of material so that it is not satisfied by the manufacturers and the customers. The hollow crank is welcomed by the market, however, it takes a long period of time to proceed and includes the steps of forging, rolling, welding and cold forging. The step of rolling especially takes a long time to finish the process. How to develop a proper method to make a hollow crank at a low cost is a concern for the manufacturers. [0002]
    • SUMMARY OF THE INVENTION
  • The present invention relates to a method for making a hollow bicycle crank and comprises a step of forging a piece by putting a piece between a first mold and a second mold. An opening is defined between the first mold and the second mold. A third mold is inserted in the opening by its prong to make a recess in a first end of the piece which becomes a prototype. [0003]
  • A step of forming a hollow first end of the crank by putting the first end of the forged prototype in step into a cone-shaped passage in a fourth mold. A pushing member forces the first end of the prototype to go through the cone-shaped passage from a wide opening to a narrow opening of the cone-shaped passage so as to seal the recess. [0004]
  • A step of thermo-forming by putting the first end of the prototype in a mold under heat and deforming the first end to have an angle relative to a second end of the prototype. [0005]
  • A step of setting the shape of the prototype by putting the first end of the prototype in a cold-forging mold. [0006]
  • The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.[0007]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 shows the step of three-direction forging of the method of the present invention; [0008]
  • FIG. 2 shows a pushing member to push the first end of the prototype through a cone-shaped passage of a mold; [0009]
  • FIG. 3 shows the pushing member and the mold with the cone-shaped passage; [0010]
  • FIG. 4 shows that the first end of the prototype is sealed after being pushed through the cone-shaped passage of the mold; [0011]
  • FIG. 5 shows the first end of the prototype is formed an angle by the thermo-forging mold; [0012]
  • FIG. 6 shows a mold to set the shape of the first end of the piece, and [0013]
  • FIG. 7 is an exploded view to show the prototype and accessories to be connected to the prototype.[0014]
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • Referring to FIG. 1, the method for making a hollow bicycle crank of the present invention comprises a step of three-direction forging: forging a piece [0015] 1 by putting a piece 1 between a first mold 2 and a second mold 20. An opening 22 is defined between the first mold 2 and the second mold 20. A third mold 21 has a prong 210 which is inserted in the opening 22 to make a recess 10 in a first end of the piece which becomes a prototype 3.
  • Referring to FIGS. [0016] 2 to 4, a step of forming a hollow first end of the crank: putting the first end of the prototype 3 into a cone-shaped passage 40 in a fourth mold 4. The cone-shaped passage 40 includes a wide opening and a narrow opening. A pushing member 5 forces the first end of the prototype 3 to go through the cone-shaped passage 40 from the wide opening to the narrow opening of the cone-shaped passage 40. The material at the inner periphery of the recess 10 is forced to come to each other and the recess 10 is then sealed when the first end of the prototype 3 passes through the narrow opening of the cone-shaped passage 40.
  • Referring to FIG. 5, a step of thermo-forming: putting the first end of the [0017] prototype 3 in a mold 6 under heat and deforming the first end to have an angle relative to a second end of the prototype 3. Referring to FIG. 6, a step of setting: putting the first end of the prototype 3 in a cold-forging mold 7 to set the shape of the prototype 3.
  • By the method of the present invention, a [0018] hollow crank 8 is made within a short period of time and two ends of the crank 8 are drilled to have threaded holes to be connected with accessories.
  • While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. [0019]

Claims (1)

What is claimed is:
1. A method for making a hollow bicycle crank, comprising:
step of forging a prototype: forging a piece by putting a piece between a first mold and a second mold, an opening defined between the first mold and the second mold, a third mold having a prong which is inserted in the opening to make a recess in a first end of the piece which becomes a prototype;
step of forming a hollow first end of the crank: putting the first end of the forged prototype in step 1 into a cone-shaped passage in a fourth mold, a pushing member forcing the first end of the prototype to go through the cone-shaped passage from a wide opening to a narrow opening of the cone-shaped passage, the recess being sealed when the first end of the prototype passes through the narrow opening of the cone-shaped passage;
step of thermo-forming: putting the first end of the prototype in a mold under heat and deforming the first end to have an angle relative to a second end of the prototype;
step of setting: putting the first end of the prototype in a cold-forging mold to set the shape of the prototype.
US10/097,578 2002-03-15 2002-03-15 Method for making hollow bicycle cranks Expired - Lifetime US6612033B1 (en)

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Application Number Priority Date Filing Date Title
US10/097,578 US6612033B1 (en) 2002-03-15 2002-03-15 Method for making hollow bicycle cranks

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Application Number Priority Date Filing Date Title
US10/097,578 US6612033B1 (en) 2002-03-15 2002-03-15 Method for making hollow bicycle cranks

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US6612033B1 US6612033B1 (en) 2003-09-02
US20030172532A1 true US20030172532A1 (en) 2003-09-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1582448A2 (en) * 2004-03-31 2005-10-05 Shimano Inc. Bicycle crank arm

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7181823B2 (en) * 2003-09-09 2007-02-27 Jie Dong Zeng Method for manufacturing integrated bicycle crank arm and spider assembly and the crank arm and spider assembly made thereby
US20060260117A1 (en) * 2005-05-19 2006-11-23 Ourway Engineering Co., Ltd. Method for manufacturing an open hollow bicycle crank
EP2230165B1 (en) 2009-03-16 2015-09-30 Cycling Sports Group, Inc. Unitary crown fork assembly and method of fabrication
EP2230167A3 (en) * 2009-03-19 2013-10-02 Cycling Sports Group, Inc. Bicycle crank shaft assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940969A (en) * 1974-10-18 1976-03-02 The Harris-Thomas Drop Forge Company Apparatus and method for forging a bicycle crank
US4061013A (en) * 1976-09-29 1977-12-06 John Kuc Method of forming socket wrenches
US4602524A (en) * 1984-11-19 1986-07-29 General Signal Corporation Method of manufacturing bicycle chain drives
US5623856A (en) * 1995-05-31 1997-04-29 Durham; Roger O. Bicycle crank arm with internal flange
JP3248676B2 (en) * 1996-12-27 2002-01-21 株式会社シマノ Bicycle crank and manufacturing method thereof
JP3149374B2 (en) * 1996-12-27 2001-03-26 株式会社シマノ Bicycle hollow crank and manufacturing method thereof
JP3248675B2 (en) * 1996-12-27 2002-01-21 株式会社シマノ Manufacturing method of bicycle crank
US6085405A (en) * 1998-09-15 2000-07-11 Kao; Cheng-Hsien Method of fabricating a handlebar stem for a bicycle
US6314834B1 (en) * 1999-01-25 2001-11-13 Truvativ International Co., Ltd. Hollow crank arm
US6401511B1 (en) * 2000-10-10 2002-06-11 Tony Leng Method for manufacturing metal material with an intermediate hollow and two solid end portions
US6508002B1 (en) * 2000-11-22 2003-01-21 Douglas Chiang Bicycle crank arm and method of making same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1582448A2 (en) * 2004-03-31 2005-10-05 Shimano Inc. Bicycle crank arm
US20050217417A1 (en) * 2004-03-31 2005-10-06 Shimano Inc. Bicycle crank arm
EP1582448A3 (en) * 2004-03-31 2007-05-30 Shimano Inc. Bicycle crank arm

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