EP0242222A2 - Method of manufacturing footwear last - Google Patents
Method of manufacturing footwear last Download PDFInfo
- 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- Withdrawn
Links
Images
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)
Abstract
Description
- This invention relates to a method of manufacturing a footwear last.
- In general, 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. In either event, 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.
- Accordingly, the present invention relates to a method of manufacturing a footwear last comprising the steps of:
- (a) forming rough castings of portions of a last;
- (b) separately machining said last portions in accordance with a predetermined pattern to yield last portions having the final desired configuration; and (c) connecting the last portions to each other to produce a finished last.
- The invention will now be described in greater detail with reference to the accompanying drawing, which illustrates a preferred embodiment of the invention, and wherein:
- Figure 1 is a schematic perspective view of a casting used to produce a last;
- Figure 2 is a schematic perspective view of the casting of Fig. 1 following cutting;
- Figure 3 is a schematic perspective view of the casting of Fig. 1 following machining; and
- Figure 4 is a schematic perspective view of a finished last.
- With reference to the drawing, 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.
- As mentioned above, the usual next step is to machine the casting 1. In order to mount the casting in a lathe or the like it is necessary to engage the heel and toe ends with mandrels. Machining is effected using an automatic, three-dimensional pantograph device and a manually produced, accurate last model. Obviously, the heel and toe ends cannot be machined in the areas surrounding the mandrels. At the completion of machining, it is necessary to manually finish the heel and toe portion of the last to remove such areas.
- In the method of the present invention, the second step is to cut the casting 1 vertically in the ankle area to form separate heel and
toe portions heel portions - The two
portions holes cut faces toe portions faces holes toe portions portions faces - Upon completion of the machining operations, the two
portions pin 10. The bolt 9 is inserted into one of the heel andtoe portions pin 10 is then inserted into the heel end of the last to prevent rotation of the twoportions portions - It will be appreciated that 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 andheel portions holes portions holes - 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 portions - Thus, there has been described a method for accurately producing footwear lasts which ensures that each last is virtually identical to the other lasts of the same size. Human error is no longer a factor to be considered in the last production.
Claims (8)
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 (en) | 1987-10-21 |
EP0242222A3 EP0242222A3 (en) | 1988-05-11 |
Family
ID=4132905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87303404A Withdrawn EP0242222A3 (en) | 1986-04-16 | 1987-04-16 | Method of manufacturing footwear last |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0242222A3 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2225210A (en) * | 1988-10-18 | 1990-05-30 | Clark Ltd C & J | Last for footwear |
DE4125786A1 (en) * | 1991-08-03 | 1993-02-04 | Schaaf & Legleitner Gmbh | Prodn. machine for shoe last toe and heel parts - makes curved-out parts, holes, links, expander piece, pull strap, and wedge and levers, with stops |
AT397904B (en) * | 1992-04-24 | 1994-08-25 | Schinner Herbert Dipl Ing | Method of producing an anatomical shoe tree |
DE4310877A1 (en) * | 1993-04-02 | 1994-10-06 | Schaaf & Legleitner Gmbh | Numerically controlled machine for producing shoe lasts |
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 (en) * | 2012-03-23 | 2013-09-24 | Machinale S R L Fab | METHOD AND EQUIPMENT FOR THE IMPLEMENTATION OF SHAPES AND PLANTARS FOR FOOTWEAR |
WO2015058440A1 (en) * | 2013-10-24 | 2015-04-30 | 乔丹体育股份有限公司 | Digital and mechanical measurement shoe last, and signal acquisition and analysis method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR499396A (en) * | 1919-04-23 | 1920-02-10 | Andre Carriere | Shoe form |
FR718748A (en) * | 1931-06-16 | 1932-01-28 | Leon Ple | Manufacturing process of shoe lasts and machines allowing the realization |
GB948704A (en) * | 1961-04-28 | 1964-02-05 | Armin Winkle | Two-part shoe last for shoe production |
FR1474670A (en) * | 1966-04-06 | 1967-03-24 | Articles intended to be engaged inside shoes, including a shape, shoe tree or the like, method of making that article or similar article | |
US3886846A (en) * | 1971-03-08 | 1975-06-03 | Roger E Bodine | Method for testing accuracy of machine tool control programs |
-
1987
- 1987-04-16 EP EP87303404A patent/EP0242222A3/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR499396A (en) * | 1919-04-23 | 1920-02-10 | Andre Carriere | Shoe form |
FR718748A (en) * | 1931-06-16 | 1932-01-28 | Leon Ple | Manufacturing process of shoe lasts and machines allowing the realization |
GB948704A (en) * | 1961-04-28 | 1964-02-05 | Armin Winkle | Two-part shoe last for shoe production |
FR1474670A (en) * | 1966-04-06 | 1967-03-24 | Articles intended to be engaged inside shoes, including a shape, shoe tree or the like, method of making that article or similar article | |
US3886846A (en) * | 1971-03-08 | 1975-06-03 | Roger E Bodine | Method for testing accuracy of machine tool control programs |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2225210A (en) * | 1988-10-18 | 1990-05-30 | Clark Ltd C & J | Last for footwear |
DE4125786A1 (en) * | 1991-08-03 | 1993-02-04 | Schaaf & Legleitner Gmbh | Prodn. machine for shoe last toe and heel parts - makes curved-out parts, holes, links, expander piece, pull strap, and wedge and levers, with stops |
AT397904B (en) * | 1992-04-24 | 1994-08-25 | Schinner Herbert Dipl Ing | Method of producing an anatomical shoe tree |
DE4310877A1 (en) * | 1993-04-02 | 1994-10-06 | Schaaf & Legleitner Gmbh | Numerically controlled machine for producing shoe lasts |
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 (en) * | 2012-03-23 | 2013-09-24 | Machinale S R L Fab | METHOD AND EQUIPMENT FOR THE IMPLEMENTATION OF SHAPES AND PLANTARS FOR FOOTWEAR |
WO2015058440A1 (en) * | 2013-10-24 | 2015-04-30 | 乔丹体育股份有限公司 | Digital and mechanical measurement shoe last, and signal acquisition and analysis method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP0242222A3 (en) | 1988-05-11 |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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STAA | Information on the status of an ep patent application or granted ep patent |
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18D | Application deemed to be withdrawn |
Effective date: 19890411 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ORD, FREDERICK L. Inventor name: STRONG, DOUGLAS R. Inventor name: FOLSCHWEILER, SERGE |