JPS57121835A - Manufacture of monolithic three-way tube head lag for bycycle of double top tube frame structure - Google Patents

Manufacture of monolithic three-way tube head lag for bycycle of double top tube frame structure

Info

Publication number
JPS57121835A
JPS57121835A JP56005087A JP508781A JPS57121835A JP S57121835 A JPS57121835 A JP S57121835A JP 56005087 A JP56005087 A JP 56005087A JP 508781 A JP508781 A JP 508781A JP S57121835 A JPS57121835 A JP S57121835A
Authority
JP
Japan
Prior art keywords
bycycle
monolithic
manufacture
frame structure
tube
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP56005087A
Other languages
Japanese (ja)
Inventor
Isao Kimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP56005087A priority Critical patent/JPS57121835A/en
Publication of JPS57121835A publication Critical patent/JPS57121835A/en
Pending legal-status Critical Current

Links

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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/29—Making branched pieces, e.g. T-pieces

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motorcycle And Bicycle Frame (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

PURPOSE:To form three branch tubes by bulging only on one side of a tube axis by forming one bulged part by the first split die and forming two bulged parts by the second split die in a tube using bulging process. CONSTITUTION:The tube 1 to be worked is put in the first split die and the first bulge forming process is performed to form a primary formed product P in which only one branch tube 2 is bulged. Then, the second bulge forming process is made by using the second split die. By this way, branch tubes 3, 4 are bulged, and a finished tube F having three branch tubes is formed.
JP56005087A 1981-01-19 1981-01-19 Manufacture of monolithic three-way tube head lag for bycycle of double top tube frame structure Pending JPS57121835A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56005087A JPS57121835A (en) 1981-01-19 1981-01-19 Manufacture of monolithic three-way tube head lag for bycycle of double top tube frame structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56005087A JPS57121835A (en) 1981-01-19 1981-01-19 Manufacture of monolithic three-way tube head lag for bycycle of double top tube frame structure

Publications (1)

Publication Number Publication Date
JPS57121835A true JPS57121835A (en) 1982-07-29

Family

ID=11601603

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56005087A Pending JPS57121835A (en) 1981-01-19 1981-01-19 Manufacture of monolithic three-way tube head lag for bycycle of double top tube frame structure

Country Status (1)

Country Link
JP (1) JPS57121835A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH058783A (en) * 1991-07-04 1993-01-19 Bridgestone Cycle Co Bicycle frame
JPH05213254A (en) * 1992-02-03 1993-08-24 Bridgestone Cycle Co Frame for bicycle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH058783A (en) * 1991-07-04 1993-01-19 Bridgestone Cycle Co Bicycle frame
JPH05213254A (en) * 1992-02-03 1993-08-24 Bridgestone Cycle Co Frame for bicycle

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