EP3027074A1 - Metal toe cap for safety footwear - Google Patents
Metal toe cap for safety footwearInfo
- Publication number
- EP3027074A1 EP3027074A1 EP14757978.3A EP14757978A EP3027074A1 EP 3027074 A1 EP3027074 A1 EP 3027074A1 EP 14757978 A EP14757978 A EP 14757978A EP 3027074 A1 EP3027074 A1 EP 3027074A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- toe cap
- metal
- wall
- peripheral wall
- arcuate peripheral
- 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- Withdrawn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
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B23/00—Uppers; Boot legs; Stiffeners; Other single parts of footwear
- A43B23/08—Heel stiffeners; Toe stiffeners
- A43B23/081—Toe stiffeners
- A43B23/082—Toe stiffeners made of metal
Definitions
- the present disclosure relates to a protection toe cap.
- the disclosure relates to a metal toe cap model for safety footwear comprising transversal ribs, providing better mechanical resistance to impacts or forces with a substantial weight reduction.
- footwear safety toe cap is well known for being arranged on the front part of the footwear itself, so as to satisfy the requirement of protecting the phalanges of the foot of an operator wearing it, more exemplified in the case of an object accidentally falling onto the foot, or generally, in the case of any occurrence that can subject the tip of the foot to high compression.
- safety toe cap of the accident prevention footwear must meets specific mechanical strength requirements according to an extensive series of international standards, which order, amongst other things, the parameters of compression resistance and the impact energy that the aforementioned toe cap must withstands in order to be approved.
- toecaps for safety footwear must normally be able to withstand an energy impact of 200 joules and a compression force of 20 kN. These values are ensured by a structure in the shape of the tip of the footwear, ending in a lip or rim at the bottom of usually a maximum dimension of 10 mm, as shown in the prior art. Toecaps with this format are usually manufactured in the following materials: steel; nylon of the polymer family.
- the current level and complexity related to most recent safety solutions and respective developments put emphasis not only in normative commitments but furthermore on the capacity of reducing the weight contribution in the safety footwear class.
- the toe cap is the heaviest integrant component contributing to approximately 35% of the average weight of a standard safety footwear model, with the particularity to be located in the region farthest from the ankle, and consequently generates the uppermost moment of force helping to make up user comfort parameters.
- the disclosure comprises a metal toe cap for safety footwear, which includes an arcuate peripheral wall that tapers forward, a top wall, and a bottom wall, defining a rear opening for receiving toes of a user.
- the toe cap is preferably made of advanced high strength steel characterized by high strength and positive properties of strain hardening and strain rate sensitivity.
- top wall and strategic portion of the arcuate peripheral wa ll have ribs defined in the geometry in a manner that maximizes strain hardening properties of the material during metal forming thus achieving higher strength in localized critical areas of the toe cap.
- a forward extension of the stiffening elements is designed in a manner that increases impact resistance in a critical area through geometrical and material properties enhancement.
- the toe cap may be manufactured in cold working advanced high strength steel that does not require thermal treatment to obtain the part resistance to static and impact loading prescribed in standards, i.e. safety footwear standards.
- a metal toe cap for safety footwear comprising:
- the reinforcement ribs are parallel and transversal in respect of the front-rear direction of the toe cap.
- the number of reinforcement ribs is 2 to 4, in particular 2, 3 or 4.
- An embodiment further comprises a front reinforcement rib extending from the top wall to part of the arcuate peripheral wall in the front of the toe cap.
- the reinforcement rib closest to the front of the toe cap is
- T "T"-shaped, having two lateral ends extending transversally in respect of the front-rear direction of the toe cap and having a front end extending from the top wall to part of the arcuate peripheral wall in the front of the toe cap.
- the ribs taper to arcuate peripheral wall.
- the metal is Advanced High Strength Steel, AHSS, in particular having a yield strength in excess of 850MPa, further on particular having a yield strength in excess of lOOOMPa.
- the shaping of the metal toe cap is by cold forming process.
- the thickness of the metal toe cap is between 0.9mm and 1.5mm, in particular 1.0mm to 1.2mm.
- the thickness of the metal toe cap is uniform throughout the metal toe cap.
- the bottom wall is a brim extending inwards from the bottom periphery of the arcuate peripheral wall.
- the present disclosure refers to a metal toe cap component for safety footwear which can complement together the main features of the current solution trends.
- AHSS are special alloys with ultimate tensile strength values normally above lOOOMPa, that show a superior mechanical strength comparing to conventional alloys, and potentiate the phenomenon of strain hardening of the material and the strain rate sensitivity in a controlled localized and specific geometry model, like that of the present disclosure, with a specific region coupled with a ribbed geometry model in order to better improve the structural deformation model.
- the metal toe cap for safety footwear in accordance with the present disclosure combines a convergent side wall structure, contributing to a lower volume concept, with an exclusive top surface comprising, preferably, two specific and structural ribs of local hardening effect.
- the metal toe cap solution does not require complementary processes of final heat treatments to achieve the respective impact and compression resistance performances. Instead, the advanced level of commitment to outperform previous strengthening states is here described and enhanced by an integrated approach of high strength steel alloys that gather specific properties with newness structural geometric re-design.
- the metal toe cap assumes an uniform thickness range throughout the entire body portion.
- the toe cap model envisaged in this disclosure has been developed to further reduce the component weight (by reducing its thickness), exceeding the reference values of the best polymeric solutions, with a weight reduction regarding the base steel model of around 40%.
- the metal toecap comprises an arcuate peripheral wall that tapers forward, a top wall, and a bottom wall, defining a rear opening for receiving toes of a user, being the top wall and strategic portions of the arcuate peripheral reinforced with ribs defined in a manner that maximizes strain hardening properties of the material during metal forming thus achieving higher strength in localized critical areas of the toe cap.
- the metal toecap has ribs in variable number (preferably 2 to 4) that are defined in a manner that reinforces both the top wall transversally and the arcuate peripheral wall in the critical lateral to top transition.
- the ribs are geometrically defined in a manner that maximizes strain hardening properties of the material during metal forming thus achieving higher strength in localized critical areas of the toe cap. These critical areas for static and dynamic loading are the top wall and the connection between the top wall and the peripheral wall. The extension of the ribs from the top wall to the peripheral wall is important for the geometric and material reinforcement of areas where high bending moments occur. [0038] In an embodiment, a forward extension of the stiffening elements is designed in a manner that increases impact resistance in a critical area through geometrical and material properties enhancement. Geometric improvement is obtained through local increase of moment of inertia while material enhancement is obtained by strain hardening properties of the material used for metal forming.
- the metal toecap for safety shoes is made of Advanced High Strength Steel alloys.
- This type of steels has in general specifications for yield strength in excess of 850MPa and within the different commercial grades have designations like: dual-phase (DP); TRIP (Transformation Induced Plasticity); Martensitic.
- DP1000 is a common reference.
- the metal toecap for safety shoes is made of Advanced High Strength Steel alloys that have yield strength in excess of 850MPa and thickness range defined between 0.9mm and 1.5mm.
- the metal toecap for safety shoes is made of Advanced High Strength Steel, alloys that do not require heat treatment for achieving component strength.
- Figure 1 represents a schematic model of an embodiment of the present disclosure.
- Figure 2 represents a computer modelling model of an embodiment of the metal toe cap.
- Figure 3 represents schematically a side view of a metal toe cap wherein (1) consists in top surface; (2) and (3) central ribs; (2a), (3a), and (3c) lateral and frontal extensions; (4) side wall and (5) tab region.
- Figure 4 represents schematically a rear view of a metal toe cap wherein (2) and (3) are central ribs; (2a), (2b), (3a), (3b) and (3c) corresponds to lateral and frontal extensions; (4) side wall and (5) tab region.
- Figure 5 represents schematically a top view of a metal toe cap wherein (1) consists in top surface; (2) and (3) central ribs; (2a), (2b), (3a), (3b) and (3c) lateral and frontal extensions; (4) side wall and (5) tab region.
- Figure 6 represents schematically a sectional view of a metal toe cap wherein (1) consists in top surface; (2) and (3) central ribs; (2b), (3b), and (3c) lateral and frontal extensions; (4) side wall; (5) tab region and (6) profile.
- Figure 7 represents schematically a perspective view, in section, of the metal toe cap in accordance with an embodiment of the present disclosure, with the highlighted thickness profile wherein (6) corresponds to the profile.
- Figure 8 represents multiple views of an embodiment of the metal toe cap - top (A), front (B), right side (C), bottom (D), perspective (E).
- the metal toe cap in accordance with the present disclosure illustrated in Figures 1 and 2 and further detailed in Figures 3 through 8 assumes a full set of technical features, which intends to outperform in an innovative combined manner, the key advantages of the role and current solutions.
- the substantial reduction of weight by increasing mechanical strength rates, withal reducing the thickness of the toe cap wall portions and controlling the optimization of the structural volume saving are major identifiable characteristics of the present disclosure.
- the full reinforcement potential is exploited by a cold forming process, particularly implemented to reproduce the toe cap model and to maximize all material properties as well, covering a proper application of AHSS grades, such as: Dual-Phase (DP), Transformation Induced Plasticity (TRIP) and Martensitic steel alloys.
- DP Dual-Phase
- TRIP Transformation Induced Plasticity
- Martensitic steel alloys The particular ribbed model assumes even greater relevance for a thickness reduction end.
- the new upgrade for a lightweight body design included some complex phenomena ' s such as structural stiffness compensation in order to improve the structural deformation mode. A set of ranges for final thickness values from 1.0mm to 1.2mm is described.
- the metal toe cap of the present disclosure is formed by a top surface (1) that differs from the conventional steel toe cap by a new mild lowering effect and mainly by forming the local stiffeners defined as structural ribs (2) and (3).
- the top surface connects with a convergent side wall portion (4) which closes on the tab region (5).
- the structural ribs are composed by two transversal, parallel, and independent elements. Both present respectively small lateral extensions, (2a), (2b), (3a) and (3b), and the forward region is composed by a specific frontal extension.
- the exclusive geometry was calculated to enable an optimized control and to reduce the opening effects of the toe cap body, specifically, the side wall (4) and contributing to restrain slipping effects in tab region (5), during the evolution of the toe cap test deformation.
- the specific forward extension of the stiffening elements (3c) was designed in a manner that increases the overall impact performance, strategically reinforced and elevated in a critical area through geometrical and material properties enhancement. Geometric improvements are obtained through local increase of moment of inertia while material enhancement is obtained by strain hardening properties of the material used for metal forming, as mentioned before.
- the local stiffening concept in accordance with the present disclosure is obtained in this model solution by a particular manufacturing process and thus not increases the thickness, or the inclusion of greater thickness portions, but rather the opposite. It ' s relevant to reassure again this perspective.
- the present disclosure promotes a mechanism of high structural strengthening that plays with the convergence of thickness reductions.
- a final stiffening shell of special steels is gained and formed with optimized material properties.
- the main ribbed metal toe cap is based on a particular metal forming process that do not requires subsequent and complementary heat treatments to achieve the reference component strength as commonly applied on conventional metallic solutions.
- the performance is led through the combination of material properties relating to the phenomenon of cold elongation properties (high strength and strain hardening); and geometric design (geometry improvement combined with local strain hardening).
- material properties relating to the phenomenon of cold elongation properties high strength and strain hardening
- geometric design geometric improvement combined with local strain hardening
- the representative profile for the toe cap thickness distribution (6) shall be uniform, and therefore in this case, all toe cap portions including (1), (2) with (2a) and (2b), (3) including (3a), (3b) and (3c), (4) and (5) have the same thickness value for a range of models between 1mm and 1.2mm.
- the weight saving of the metal toe cap in accordance with the present disclosure and the EN framework and compared with conventional steel toe caps is around 40%.
- An embodiment comprises a safety metal toe cap component for safety footwear comprising an exclusive geometric upper surface, a convergent U shaped side wall surface, and a bottom wall for the tab region, defining a proper rear opening.
- the present toe cap enables a reduction in weight by 40% compared to conventional steel toe cap models and a volume reduction (space saving) of 30% concerning the most referenced polymeric models.
- An embodiment comprises a toe cap wherein the top surface includes an exclusive local stiffening concept using, at least, two independent, parallel and crosswise ribs relating to the ultimate strength properties enhancement.
- the combined hardness surface also comprises lateral extensions of the ribs and a forward extension to improve impact resistance properties.
- the toe cap presents the highest rate of mechanical strength.
- An embodiment comprises a toe cap which presents an uniform thickness distribution for models with a range of values between 1mm to 1.2mm.
- An embodiment comprises a metal toe cap model with a similar base surface development of the toe cap model as previously reported, not including the local stiffening concept and the hardness ribs formation.
- An embodiment comprises a toe cap which presents an uniform thickness distribution for models with a range of values between 1.4mm to 1.5mm.
- An embodiment comprises a toe cap which is exclusively made from grades of Advanced High Strength Steels - AHSS. Therefore, the applications in the present disclosure of Dual Phase (DP), Transformation Induced Plasticity (TRIP), and Martensitic special alloys with yield strength specifications in excess of 850MPa are part of the disclosure.
- DP Dual Phase
- TRIP Transformation Induced Plasticity
- Martensitic special alloys with yield strength specifications in excess of 850MPa are part of the disclosure.
- An embodiment comprises a metal toe cap manufactured by a specific and particular metal forming process that allows withholding of the typical set of subsequent heat treatments, commonly used in the application of conventional steel alloys for metallic toe caps.
- the higher mechanical strength and normative performance are thus guaranteed earlier by an innovative approach in this sector of technical features aforementioned.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PT10711413 | 2013-08-02 | ||
PCT/IB2014/063687 WO2015015477A1 (en) | 2013-08-02 | 2014-08-04 | Metal toe cap for safety footwear |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3027074A1 true EP3027074A1 (en) | 2016-06-08 |
Family
ID=51429332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14757978.3A Withdrawn EP3027074A1 (en) | 2013-08-02 | 2014-08-04 | Metal toe cap for safety footwear |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3027074A1 (en) |
WO (1) | WO2015015477A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10743622B2 (en) * | 2015-06-08 | 2020-08-18 | Tbl Licensing Llc | Footwear ventilation structures and methods |
IT201900020742A1 (en) * | 2019-11-11 | 2021-05-11 | Alustrategy S R L | Toe cap for footwear and related footwear |
US11684114B2 (en) * | 2020-10-23 | 2023-06-27 | Tbl Licensing Llc | Strain-hardened safety toe for footwear |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB511324A (en) * | 1938-07-09 | 1939-08-16 | John Broughton | An improved protector for the toes of boots and shoes |
EP1029463A1 (en) | 1999-02-19 | 2000-08-23 | Uk Safety Group Limited | Asymmetric cap |
US6367170B1 (en) | 2000-12-18 | 2002-04-09 | Darco Industries Llc | Plastic toe cap and method of making |
DE10341706B3 (en) * | 2003-09-10 | 2004-11-25 | Otter Schutz Gesellschaft für Entwicklung und Vertrieb persönlicher Schutzausrüstungen mbH | Toe protection cap for safety shoe has shaped metal piece provided on inside with reinforcement with thickness which reduces continuously on either side of centre |
US20060213086A1 (en) | 2005-03-24 | 2006-09-28 | Chen-Jen Ching | Metal toecap for safety shoes |
EP2286686A1 (en) | 2009-08-21 | 2011-02-23 | Mascot International A/S | Toe protection cap and footgear comprising toe protection cap |
-
2014
- 2014-08-04 WO PCT/IB2014/063687 patent/WO2015015477A1/en active Application Filing
- 2014-08-04 EP EP14757978.3A patent/EP3027074A1/en not_active Withdrawn
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2015015477A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2015015477A1 (en) | 2015-02-05 |
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