GB2061172A - Process for the production of high-heeled synthetic resin footwear - Google Patents
Process for the production of high-heeled synthetic resin footwear Download PDFInfo
- Publication number
- GB2061172A GB2061172A GB8018351A GB8018351A GB2061172A GB 2061172 A GB2061172 A GB 2061172A GB 8018351 A GB8018351 A GB 8018351A GB 8018351 A GB8018351 A GB 8018351A GB 2061172 A GB2061172 A GB 2061172A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reinforcement
- synthetic resin
- footwear
- production
- mould
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 28
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 230000002787 reinforcement Effects 0.000 claims abstract description 43
- 238000001746 injection moulding Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000004873 anchoring Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 3
- 239000007924 injection Substances 0.000 abstract description 3
- 238000007373 indentation Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/061—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising by injection moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D35/00—Producing footwear
- B29D35/06—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising
- B29D35/08—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts
- B29D35/081—Producing footwear having soles or heels formed and joined on to preformed uppers using a moulding technique, e.g. by injection moulding, pressing and vulcanising having multilayered parts by injection moulding
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
A process is described for the production of high-heeled synthetic resin footwear by injection moulding, the footwear having a heel cavity reinforcement (10) made of ferrous material. First the uppers and insole are produced in a first mould having a vamp portion (22) and a sole portion (26), the reinforcement (10) including a heel stem (18) being embedded in the insole by keeping the reinforcement in position in a recess (28) in the sole portion (26) of the mould by means of permanent magnets (36, 38) incorporated in the sole portion (26). The attractive force of the permanent magnets (36, 38) is such that the uppers with the reinforcement (10) attached to the insole can be withdrawn from the permanent magnets (36, 38) after injection of the synthetic resin. In a second step of the process the sole and heel are attached to the uppers by injection moulding synthetic resin in a second mould (not shown). <IMAGE>
Description
SPECIFICATION
Process for the production of high-heeled synthetic resin footwear, heel cavity reinforcement used in the process and the footwear obtained
This invention relates to a process for the production of high-heeled synthetic resin footwear, a heel cavity reinforcement used in the process and the footwear obtained by this process. More particularly, this invention relates to a process for the production of moulded synthetic resin footwear, particularly highheeled boots, by injection moulding in two steps, i.e.
a first step for producing the uppers and insole and a second step for attaching the sole and heel to the uppers.
Such processes for the production of footwear by injection moulding in two steps are known. In these processes there is a problem of incorporating a resilient reinforcement for stiffening the plantar arch of the footwear and providing support for the heel.
Hitherto this problem has been solved by temporarily anchoring the reinforcement to the sole plate of the mould used for injection moulding of the uppers, by means such as screws (usually only one screw) penetrating into a heel stem of the reinforcement for securing it to the plantar arch of the mould. However, this method can only be used for footwear having relatively thick heels to enable the insertion therein of a heel stem of relatively large diameter in which a tapped hole can be made for receiving the screw.
Also the operation of screwing this screw in and out requires a considerable amount of time.
It is an object of the present invention to simplify the operation of anchoring the reinforcement to the sole plate of the mould and also to provide a reinforcement permitting the production of footwear having a much thinner heel than could be made with the conventional processes.
This and other objects and advantages of the invention, which will become apparent from the following description, are achieved according to the invention by a process for the production of synthetic resin footwear by injection moulding wherein first the uppers and insole are produced in a first mould having a vamp portion and a sole portion and then the sole and heel are attached to the uppers by injection moulding in a second mould, this process being characterized in that for moulding the uppers a reinforcement made at least partially of ferrous material is placed on the sole portion of the first mould and the reinforcement is retained thereon by the attraction of at least one permanent magnet embedded in said sole portion, the degree of attraction of the permanent magnet being selcted to permit detachment of the reinforcement after the latter has been embedded in the synthetic resin which is subsequently injected.
The reinforcement according to the invention comprises an arcuate steel strip having one end embedded in a rigid synthetic resin body having a flat surface from which extends perpendicularly a thin rigid heel stem.
The invention also relates to the footwear produced by the process described above.
A preferred embodiment of the process, reinforcement and footwear according to the invention will now be described by way of example and with reference to the accompanying drawings, in which:
Figure 1 is a side view of the reinforcement used in the process according to the invention;
Figure2 is a plan view of the reinforcement;
Figure 3 is a longitudinal section through the major part of a mould used in the first step of injection moulding of footwear by the process according to the invention, and
Figure 4 is a longitudinal section through the major part of the lady's boot produced by the process according to the invention.
As shown in Figures 1 to 3, a reinforcement used in the process according to the invention comprises an arcuate strip 10 made preferably of steel or some otherferrous material, stiffened buy a longitudinal rib 12 and provided with some through holes or orifices 14 at one end for purposes which will become apparent from the following description.
The opposite end of the arcuate strip 10 is embedded in a heel support comprising a main body 16 of rigid moulded synthetic resin, preferably foamed ABS, having a flat surface 17 from which extends perpendicularly a heel stem 18 formed integrally with the main body 16. Preferably the heel stem 18 has a thin cylindrical shape terminating in a conical or tapering pointed end 20.
Figure 3 shows a mould as used in the first step of the process for producing footwear by injection moulding according to the invention. Indicated by 22 in Figure 3 is a vamp portion of the mould which is used for injection moulding the uppers of a highheeled lady's boot. 24 denotes the core of the mould and 26 the sole portion thereof. A gap 23 is left between the core 24 and the vamp portion 22. This gap is filled with synthetic resin to form the uppers.
Another gap 25 is formed between the core 24 and the sole portion 26 to form a light insole integrally with the uppers. The gap 25 has a wider portion 27 to produce a thickened portion in the insole which will later appear in a corresponding window in the sole of the finished footwear.
The sole portion 26 is provided with a seat for receiving the reinforcement shown in Figures 1 and 2. This seat comprises a recess 28 for receiving the steel strip of the reinforcement and a hole 30 for receiving the heel stem 18 of the reinforcement. The recess 28 has a plurality of indentations 29 to form corresponding bosses in the synthetic resin to be later injected, to improve the anchoring of the reinforcement to the insole. The hole 30 has an upwardly widening portion 32 with a flat lower connection surface 34 serving as abutment for the step formed between the body 16 and the heel stem 18 of the reinforcement.
A pair of permanent magnets 36,38 is embedded in the foot portion of the mould below the recess 28 for receiving the steel strip of the reinforcement. The taper of the portion 32 of the seat in the sole portion 26 of the mould is greater than the degree of tapering of the body 16 of the reinforcement so that the synthetic resin can flow around this body during the injection moulding process whereas the abut ment 34 prevents the synthetic resin from flowing further along the heel stem 18 as otherwise it would be difficult to detach the reinforcement from its seat after the first step of injection moulding.
The described apparatus is normally used on revolving injection moulding machines in which the sole portion of the mould is mounted for vertical pivotal movement. Therefore, in the first step of the moulding operation the reinforcement is placed on its seat on the sole portion 26 ofthe mould where it is retained by the permanent magnets 36,38. Then the sole portion of the mould is pivotally moved toward the vamp portion 22 to close the mould. The attractive force of the permanent magnets 36,38 is selected to ensure reliable retention of the reinforcement as the sole portion of the mould moves toward the remaining portion thereof and during the subsequent injection of the synthetic resin, but so as to be insufficient to retain the reinforcement after it is embedded in the insole formed integrally with the uppers. Thus, when the mould is opened again after injection of the synthetic resin, the reinforcement can be removed from the sole portion of the mould and remains attached to the moulded product.
Then the sole and heel are moulded and attached to the uppers in the conventional manner in a separate mould not shown as it does not form part of the present invention.
Figure 4 shows in longitudinal section a lady's boot 39 produced by the described process. In Figure 4the attached sole is indicated by 40 and the heel covering the heel stem 18 is denoted by 42. As will be evident from Figure 4, due to the particular shape of the reinforcmentthe heel may be made very thin.
Claims (10)
1. A process for the production of synthetic resin footwear by injection moulding wherein first the uppers and insole are produced in a first mould having a vamp portion and a sole portion and then the sole and heel are attached to the uppers by injection moulding in a second mould, characterized in that for moulding the uppers a reinforcement made at least partially of ferrous material is placed on the sole portion of the first mould and the reinforcement is retained thereon by the attraction of at least one permanent magnet in said sole portion, the degree of attraction of the permanent magnet being selected to permit detachment of the reinforcement after the latter has been embedded in the synthetic resin which is subsequently injected.
2. A process for the production of synthetic resin footwear as claimed in claim 1, characterized in that the reinforcement is provided with holes to improve its anchoring to the injected synthetic resin.
3. A process for the production of synthetic resin footwear as claimed in claim 1 or 2, characterized in that the reinforcement includes a heel supporting portion provided with a thin cylindrical heel stem extending in the direction of the heel of the footwear to be produced.
4. A process for the production of synthetic resin footwear as claimed in any of the preceding claims, characterized in that the sole portion of the first
mould has a seat for receiving the reinforcement,
said seat being of a shape complementary to that of
the reinforcement and having additional recesses for
improving the anchoring of the reinforcement in the I subsequently injected synthetic resin.
5. A reinforcement for use in the process for the
production of synthetic resin footwear as claimed in
claims 1 to 4, characterized by an arcuate steel strip
having one end embedded in a rigid synthetic resin
body having a flat surface from which extends
perpendicularly a thin rigid heel stem.
6. A reinforcement as claimed in claim 5, char
acterized in that the arcuate steel strip has a
longitudinal stiffening rib.
7. A reinforcement as claimed in claim 5 or 6,
characterized in that the arcuate steel strip has a
plurality of holes in its free end.
8. Footwear produced by the process as claimed
in claims 1 to 4.
9. A process for the production of synthetic resin
footwear substantially as hereinbefore described
with reference to and as illustrated by the accom
panying drawings.
10. A reinforcement for use in the process for the production of synthetic resin footwear substantially
as hereinbefore described with reference to and as
illustrated by the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT69089/79A IT1119476B (en) | 1979-10-26 | 1979-10-26 | PROCEDURE FOR THE MANUFACTURE OF FOOTWEAR OF SYNTHETIC RESIN WITH HIGH SHEET HEEL USED IN THE PROCEDURE AND FOOTWEAR OBTAINED WITH THE PROCEDURE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2061172A true GB2061172A (en) | 1981-05-13 |
Family
ID=11311325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8018351A Withdrawn GB2061172A (en) | 1979-10-26 | 1980-06-04 | Process for the production of high-heeled synthetic resin footwear |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3021543A1 (en) |
| GB (1) | GB2061172A (en) |
| IT (1) | IT1119476B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0311915A2 (en) * | 1987-10-13 | 1989-04-19 | Dunlop Limited | Footwear reinforcement |
| WO2000044251A1 (en) * | 1999-01-27 | 2000-08-03 | Spenco Medical Corporation | Therapeutic magnetic insoles |
| US7107705B2 (en) | 2002-12-23 | 2006-09-19 | Spenco Medical Corporation | Insole with improved cushioning and anatomical centering device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1233761B (en) * | 1989-03-13 | 1992-04-14 | Sportime Spa | PROCESS AND MOLD FOR THE PRODUCTION OF FOOTWEAR WITH SOLES AND MIDSOLE IN MORE COLORS AND / OR MATERIALS. |
-
1979
- 1979-10-26 IT IT69089/79A patent/IT1119476B/en active
-
1980
- 1980-06-04 GB GB8018351A patent/GB2061172A/en not_active Withdrawn
- 1980-06-07 DE DE19803021543 patent/DE3021543A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0311915A2 (en) * | 1987-10-13 | 1989-04-19 | Dunlop Limited | Footwear reinforcement |
| EP0311915A3 (en) * | 1987-10-13 | 1989-11-23 | Dunlop Limited | Footwear reinforcement |
| WO2000044251A1 (en) * | 1999-01-27 | 2000-08-03 | Spenco Medical Corporation | Therapeutic magnetic insoles |
| US7107705B2 (en) | 2002-12-23 | 2006-09-19 | Spenco Medical Corporation | Insole with improved cushioning and anatomical centering device |
Also Published As
| Publication number | Publication date |
|---|---|
| IT7969089A0 (en) | 1979-10-26 |
| IT1119476B (en) | 1986-03-10 |
| DE3021543A1 (en) | 1981-05-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |