EP0242222A2 - Verfahren zum Herstellen eines Schuhwerkleistens - Google Patents

Verfahren zum Herstellen eines Schuhwerkleistens Download PDF

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Publication number
EP0242222A2
EP0242222A2 EP87303404A EP87303404A EP0242222A2 EP 0242222 A2 EP0242222 A2 EP 0242222A2 EP 87303404 A EP87303404 A EP 87303404A EP 87303404 A EP87303404 A EP 87303404A EP 0242222 A2 EP0242222 A2 EP 0242222A2
Authority
EP
European Patent Office
Prior art keywords
last
portions
toe
heel
casting
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.)
Withdrawn
Application number
EP87303404A
Other languages
English (en)
French (fr)
Other versions
EP0242222A3 (de
Inventor
Douglas R. Strong
Frederick L. Ord
Serge Folschweiler
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.)
Bata Industries Ltd
Original Assignee
Bata Industries Ltd
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 Bata Industries Ltd filed Critical Bata Industries Ltd
Publication of EP0242222A2 publication Critical patent/EP0242222A2/de
Publication of EP0242222A3 publication Critical patent/EP0242222A3/de
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D3/00—Lasts
    • A43D3/02—Lasts for making or repairing shoes

Definitions

  • This invention relates to a method of manufacturing a footwear last.
  • footwear lasts are currently formed of hard plastic such as polyolefins.
  • the plastic is molded, i.e. rough cast to produce an article vaguely resembling a foot.
  • the rough cast last is machined on a lathe to more closely resemble the finished product, then cut from top to bottom when a multi-piece last is being produced so that a hinge can be added. If no hinge is required, i.e. for one-piece lasts, no cut is made.
  • the un- finshed last is left with projections at the toe and heel ends where the last was mounted in the lathe. The last is normally finished by removing the projections manually.
  • the conventional method tends to be inaccurate.
  • the quality of the manual finishing step depends upon the skill of the individual last maker, and it is readily apparent that differences will occur from one last maker to the next.
  • the object of the present invention is to solve the above identified problem by providing a relatively simple method of producing a footwear last which results in accurately sized lasts regardless of the skill of the last maker.
  • the present invention relates to a method of manufacturing a footwear last comprising the steps of:
  • the first step in the method of the present invention is to produce a roughly foot-shaped casting 1.
  • the casting 1 is formed from a polyolefin such as polyethylene. Since this step is conventional, no details of the casting procedure are given.
  • the usual next step is to machine the casting 1.
  • Machining is effected using an automatic, three-dimensional pantograph device and a manually produced, accurate last model.
  • the heel and toe ends cannot be machined in the areas surrounding the mandrels.
  • the second step is to cut the casting 1 vertically in the ankle area to form separate heel and toe portions 2 and 3, respectively.
  • vertical is meant approximately vertical.
  • toe and heel portions 2 and 3 can be cast separately, i.e. produced by casting separate portions or cut from a larger body.
  • the cut is inclined and not rectilinear.
  • the two portions 2 and 3 of the casting are mounted on a base plate (not shown), which is intended for mounting on a milling machine.
  • Mounting is effected by tapping oppositely threaded holes 5 and 6 in the cut faces 7 and 8, respectively of the heel and toe portions 2 and 3.
  • the faces 7 and 8 are cut accurately, and thus provide reference surfaces to enable accurate milling.
  • the holes 5 and 6 receive bolts (not shown) on the base plate.
  • the milling machine is an automatic, computer operated three-dimensional machine using patterns for the heel and toe portions 2 and 3 generated by digitizing. Digitizing is a procedure involving the making of a three-dimensional pattern of a last, and storing details of such pattern in a computer memory. Because the two portions 2 and 3 of the last are held by bolts in the faces 7 and 8 of the vertical cut, the entire remaining surfaces of such portions can be machined.
  • the two portions 2 and 3 are connected together using a bolt 9, the ends of which are oppositely threaded, and a pin 10.
  • the bolt 9 is inserted into one of the heel and toe portions 2 and 3, and the other portion is rotated onto the projecting end of the bolt.
  • the pin 10 is then inserted into the heel end of the last to prevent rotation of the two portions 2 and 3.
  • a socket for receiving an Allen key is provided in the heel end of the bolt 9.
  • the pin 10 can be replaced with a second bolt similar to the bolt 9. Following milling, the bolts are removed from both the toe and heel portions 2 and 3, and positioned between such portions. Allen keys are inserted through both holes 5 and 6 in the heel portion into sockets in the ends of the bolts, and the bolts are rotated to draw the two portions 2 and 3 together. In both cases the holes 5 and 6 are filled with plastic to complete the last.
  • the same procedure can be used for a multi-piece last, e.g. the conventional two-piece or split last.
  • the holes formed in the cut faces 7 and 8 of the portions 2 and 3 to mount the portions on the milling machine can also be used to receive the last hinge. Alternatively, the holes can be altered following machining to receive the hinge structure.

Landscapes

  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP87303404A 1986-04-16 1987-04-16 Verfahren zum Herstellen eines Schuhwerkleistens Withdrawn EP0242222A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA506819 1986-04-16
CA506819 1986-04-16

Publications (2)

Publication Number Publication Date
EP0242222A2 true EP0242222A2 (de) 1987-10-21
EP0242222A3 EP0242222A3 (de) 1988-05-11

Family

ID=4132905

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87303404A Withdrawn EP0242222A3 (de) 1986-04-16 1987-04-16 Verfahren zum Herstellen eines Schuhwerkleistens

Country Status (1)

Country Link
EP (1) EP0242222A3 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225210A (en) * 1988-10-18 1990-05-30 Clark Ltd C & J Last for footwear
DE4125786A1 (de) * 1991-08-03 1993-02-04 Schaaf & Legleitner Gmbh Vorrichtung zur herstellung von leistenteilen fuer schuhleisten
AT397904B (de) * 1992-04-24 1994-08-25 Schinner Herbert Dipl Ing Verfahren zur herstellung eines anatomischen schuhstreckers
DE4310877A1 (de) * 1993-04-02 1994-10-06 Schaaf & Legleitner Gmbh Numerisch gesteuerte Maschine zur Herstellung von Schuhleisten
WO1995017110A1 (en) * 1993-12-23 1995-06-29 Palser Officina Meccanica S.N.C. Automatic machine for fabricating articulated forms for shoe manufacturing, starting from rough-shaped molded pieces
US7745582B2 (en) 1996-08-30 2010-06-29 Upfront Chromatography Isolation of immunoglobulins
ITPI20120030A1 (it) * 2012-03-23 2013-09-24 Machinale S R L Fab Metodo e apparecchiatura per la realizzazione di forme e plantari per calzature
WO2015058440A1 (zh) * 2013-10-24 2015-04-30 乔丹体育股份有限公司 数字化力学测量楦头及其信号获取和分析方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR499396A (fr) * 1919-04-23 1920-02-10 Andre Carriere Forme pour chaussures
FR718748A (fr) * 1931-06-16 1932-01-28 Leon Ple Procédé de fabrication de formes à chaussures et machines en permettant la réalisation
AT246607B (de) * 1961-04-28 1966-04-25 Brueder Winkle Rohteile zum Herstellen eines zweiteiligen Schuhleistens
FR1474670A (fr) * 1966-04-06 1967-03-24 Articles destinés à être engagés à l'intérieur de chaussures, notamment une forme, un embauchoir ou similaire, procédé de fabrication de cet article ou article similaire
US3886846A (en) * 1971-03-08 1975-06-03 Roger E Bodine Method for testing accuracy of machine tool control programs

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225210A (en) * 1988-10-18 1990-05-30 Clark Ltd C & J Last for footwear
DE4125786A1 (de) * 1991-08-03 1993-02-04 Schaaf & Legleitner Gmbh Vorrichtung zur herstellung von leistenteilen fuer schuhleisten
AT397904B (de) * 1992-04-24 1994-08-25 Schinner Herbert Dipl Ing Verfahren zur herstellung eines anatomischen schuhstreckers
DE4310877A1 (de) * 1993-04-02 1994-10-06 Schaaf & Legleitner Gmbh Numerisch gesteuerte Maschine zur Herstellung von Schuhleisten
WO1995017110A1 (en) * 1993-12-23 1995-06-29 Palser Officina Meccanica S.N.C. Automatic machine for fabricating articulated forms for shoe manufacturing, starting from rough-shaped molded pieces
US7745582B2 (en) 1996-08-30 2010-06-29 Upfront Chromatography Isolation of immunoglobulins
ITPI20120030A1 (it) * 2012-03-23 2013-09-24 Machinale S R L Fab Metodo e apparecchiatura per la realizzazione di forme e plantari per calzature
WO2015058440A1 (zh) * 2013-10-24 2015-04-30 乔丹体育股份有限公司 数字化力学测量楦头及其信号获取和分析方法

Also Published As

Publication number Publication date
EP0242222A3 (de) 1988-05-11

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Inventor name: ORD, FREDERICK L.

Inventor name: STRONG, DOUGLAS R.

Inventor name: FOLSCHWEILER, SERGE