WO2002026071A1 - Safety footwear - Google Patents
Safety footwear Download PDFInfo
- Publication number
- WO2002026071A1 WO2002026071A1 PCT/CA2001/001299 CA0101299W WO0226071A1 WO 2002026071 A1 WO2002026071 A1 WO 2002026071A1 CA 0101299 W CA0101299 W CA 0101299W WO 0226071 A1 WO0226071 A1 WO 0226071A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outsole
- insole
- electronic device
- sole
- conductive
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B7/00—Footwear with health or hygienic arrangements
- A43B7/36—Footwear with health or hygienic arrangements with earthing or grounding means
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B3/00—Footwear characterised by the shape or the use
- A43B3/34—Footwear characterised by the shape or the use with electrical or electronic arrangements
Definitions
- the present invention relates to footwear and, more particularly, to a safety footwear which is adapted to dissipate electrostatic charges while at the same time protecting the wearer against electric shocks .
- United States Patent No. 4,785,371 also teaches that the overall resistance across the composite sole should be in a range of about 10 6 to 10 8 ohms to not expose the wearer to the undue risk of injury from electrical contact, as would conventional conductive footwear exhibiting' an overall resistance from zero to about 10 4 ohms. While plastic soles doped with electrically conductive substances are generally effective, they are generally not suitable for use in cold weather applications.
- United States Patent No. 2,712,099 issued on February 23, 1952 to Legge discloses a footwear having metallic grounding members for conducting electrostatic charges from the body of the wearer to the ground. Resistors are provided in a free space defined in the sole to act as a safety device to prevent the passage of a current of high amperage from the grounding members to the wearer's body. This arrangement is particularly adapted for use in dry weather or when wearer is not engaged in a wet or soggy ground condition which might render the shoe conductive.
- a composite sole for use in an electrostatic dissipative footwear comprising an insole and an outsole spaced by a mid sole, said insole and said outsole being at least partly made of electrically-conducting material, whereas said mid sole is made of a substantially non-conductive material, and an electronic device electrically connected to said insole and said outsole for controlling current flow therebetween, said electronic device being embedded in said mid sole which acts therefor as an insulator.
- a method of manufacturing an electrostatically dissipating sole for a safety footwear comprising the steps of: providing a conductive insole and a conductive outsole, providing an electronic device in a free space between said insole and said outsole for controlling current flow therebetween, connecting said insole and said outsole in electrically conductive relationship with said electronic device, and structurally joining said insole to said outsole by injecting a substantially non-conductive material in said free space to form a mid sole between said insole and said outsole with said electronic device at least partly embedded in said mid sole.
- Fig. 1 is a longitudinal cross-sectional view of a safety footwear in accordance with a first embodiment of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS Now referring to Fig. 1, a safety footwear embodying the elements of the present invention and generally designated by numeral 10 will be described.
- the safety footwear 10 includes an upper 12 secured to a composite sole 1 .
- the composite sole 14 includes an electrically conductive insole 16, an electrically insulating mid sole 18, an electrically conductive outsole 20, and an electronic device 22 embedded in the mid sole 18 for dynamically controlling the electric flow between the insole sole 16 and the outsole 20.
- a removable foot bead 24 made of a conductive material, such as a woven material with conductive fibers .
- the removable foot bead 24 has a resistance of about 10 5 ohms or less.
- the inner sole 16 forms the bottom portion of the upper 12 and is typically made of a conducting fiberboard material having a resistance of about 10 s ohms or less.
- the electronic device 22 defines with the insole 16 and the outsole 20 a pair of electrically conductive paths 26 for dissipating electrostatic charges from the feet of the wearer to the ground.
- the resistance of each path 26 is precisely set by a resistor 28 forming part of the device 22.
- Each resistor 28 has a precise resistance selected in a range of about 0 to 10 s ohms.
- the resistance of the removable foot bead 24, the insole 16 and the outsole 20 must be less than that of the resistors 28 to ensure that the overall resistance of the electrically conductive paths 26 be limited by the resistors 28 and, thus, set thereby.
- the resistors 28 advantageously allows to precisely set the effective resistance of the footwear between the wearer's feet and the ground.
- a microfuse 30 is preferably inserted in each electrically conductive path 26 to prevent the passage of a current of high amperage from the outsole 20 to the insole 16 in order to protect the wearer against electrical shocks.
- the provision of such microfuse 30 advantageously allows reducing the effective resistance of the safety footwear 10 between the wearer feet and the ground, thereby increasing the overall dissipating capacity of the safety footwear 10 and that without exposing the wearer to the undue risk of electrical shocks.
- each microfuse 30 could consist of aluminum or lead wire having a maximum cross-sectional area of about 1 x 10 " 11 m 2 .
- Each microfuse 30 is connected to a ground engaging plug 32 forming part of the outsole 20.
- One plug 32 could be provided at the heel region of the outsole 20 and the other one at the forepart region thereof.
- the ground engaging plugs 32 are made of a conductive material having a resistance of 10 4 to 10 6 ohms.
- the plugs 32 could be made of a rubber material containing an electrically conductive substance.
- the outsole 20 is preferably molded from high-density polyurethane having a resistance in a range of about 10 7 to 10 11 ohms.
- Conductive washers 34 having sharp teeth 36 protruding at right angles from one side thereof can be used to anchor the resistors 28 and the microfuses 30 into the insole 16 and the ground engaging plugs 32.
- a conductive adhesive could be used.
- the insole 16 and the outsole 20 are structurally joined by the mid sole 18 which is formed by injecting low density polyurethane in the free space between the prefabricated insole 16 and outsole 20 after the electronic device 22 has been operatively connected therebetween.
- a conductive adhesive is used to secure the insole 16 to the mid sole 18.
- the mid sole has a resistance in a range of about 10 8 to 10 11 ohms and, thus, acts as an insulating cartridge for the electronic device 22 which is completely embedded therein.
- the mid sole 18 is impermeable and, thus, protects the electronic device 22 from the elements.
- the use of a two density injection molding process to form the mid sole 18 and the outsole 20 allows to obtain a composite sole which is flexible and of a relatively lightweight construction.
- the outsole 20 is first molded and the insole 16 fabricated with the upper 12 using known techniques. Then, the electric circuits formed by the resistors 28 and the microfuses 30 are inserted between the insole 16 and the outsole 20 and connected thereto in electrically conductive relationship.
- the insole 16 and the outsole 20 are maintained in relatively close proximity in a mold and low density polyurethane is then injected in the free space between the insole 16 and the outsole 20 for forming the mid sole 18 in which the resistors 28 and the microfuses 30 are embedded and, thus, sealed from the atmosphere .
- the outsole could be solely molded from a rubber material containing electrically conductive substance. This would provide a continuous grounding surface of conductive material but would increase the weight of the safety shoe 10.
- the fuse could consist of a reversed biased diode or, alternatively, of an assembly of transistors.
- the plugs 32 could be electrically connected together with a single resistor and a single fuse completing the electric circuit between the insole and the outsole.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002367542A CA2367542C (en) | 2000-09-28 | 2001-09-13 | Safety footwear |
AU2001291554A AU2001291554A1 (en) | 2000-09-28 | 2001-09-13 | Safety footwear |
EP01971558A EP1320305A1 (en) | 2000-09-28 | 2001-09-13 | Safety footwear |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/671,138 | 2000-09-28 | ||
US09/671,138 US6549391B1 (en) | 2000-09-28 | 2000-09-28 | Safety footwear |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002026071A1 true WO2002026071A1 (en) | 2002-04-04 |
Family
ID=24693274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2001/001299 WO2002026071A1 (en) | 2000-09-28 | 2001-09-13 | Safety footwear |
Country Status (5)
Country | Link |
---|---|
US (1) | US6549391B1 (en) |
EP (1) | EP1320305A1 (en) |
AU (1) | AU2001291554A1 (en) |
CA (1) | CA2367542C (en) |
WO (1) | WO2002026071A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017199020A1 (en) * | 2016-05-19 | 2017-11-23 | N-Ion Sports Technology Limited | Grounding footwear |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6721161B2 (en) * | 2001-03-21 | 2004-04-13 | Iron Age Corporation | Sole structure for electrostatic dissipative footwear and method of making same |
US7259954B2 (en) * | 2003-06-18 | 2007-08-21 | Edstrom Steven D | Electrical static discharge method and apparatus |
WO2008017166A1 (en) * | 2006-08-11 | 2008-02-14 | Simon La Rochelle | Electric-charge protective equipment |
US7471497B1 (en) * | 2007-04-16 | 2008-12-30 | Knight Sr William C | Electrostatic discharge prevention device |
US7913428B2 (en) * | 2007-07-20 | 2011-03-29 | Ching-Hung Wang | Electromagnetic fitness shoes with a conductor structure |
US9003567B2 (en) * | 2007-12-09 | 2015-04-14 | 180S, Inc. | Hand covering with tactility features |
US8336119B2 (en) * | 2007-12-09 | 2012-12-25 | 180's. Inc. | Hand covering with conductive portion |
US9655405B2 (en) | 2010-04-22 | 2017-05-23 | Kristan Lisa Hamill | Insoles for tracking, data transfer systems and methods involving the insoles, and methods of manufacture |
CN104349692B (en) * | 2013-03-21 | 2016-01-20 | 大科防静电技术咨询(深圳)有限公司 | Footwear conducting ring and footwear |
DE202018103291U1 (en) * | 2018-04-09 | 2018-06-18 | Haka Co., Ltd. | Shoe with electrostatic discharge over several electrical contact points |
US20220151335A1 (en) * | 2018-11-15 | 2022-05-19 | N-Ion Sports Technology Limited | Grounding footwear with a blade portion |
US11517072B2 (en) | 2019-09-09 | 2022-12-06 | International Business Machines Corporation | Adaptive electrostatic discharge and electric hazard footwear |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2712099A (en) | 1955-06-28 | G legge | ||
GB1319294A (en) * | 1969-07-24 | 1973-06-06 | Dalton J A | Footwear soles |
DE3036263A1 (en) * | 1979-10-25 | 1981-04-30 | Jowa Holzschuhe GmbH & Co KG, Fieberbrunn, Tirol | Antistatic sole for wooden shoe - has holes in heel and instep through which electricity conductors pass, to be covered by layers |
US4366630A (en) | 1979-12-07 | 1983-01-04 | Aeci Limited | Foot wear |
FR2596257A1 (en) * | 1986-03-25 | 1987-10-02 | Lalet Sa Raoul | Article of footwear for eliminating static electricity |
US4785371A (en) | 1986-11-28 | 1988-11-15 | Interco Incorporated | Electrostatic dissipating footwear |
US5426870A (en) * | 1991-05-17 | 1995-06-27 | Phurness Pty. Ltd. | Antistatic shoe sole |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2712098A (en) * | 1955-06-28 | legge | ||
US4674204A (en) * | 1983-02-28 | 1987-06-23 | Sullivan James B | Shock absorbing innersole and method for preparing same |
US4551930A (en) * | 1983-09-23 | 1985-11-12 | New Balance Athletic Shoe, Inc. | Sole construction for footwear |
US4654983A (en) * | 1984-06-05 | 1987-04-07 | New Balance Athletic Shoe, Inc. | Sole construction for footwear |
US4735195A (en) * | 1986-04-01 | 1988-04-05 | Blum Alvin S | Device encouraging periodic joint motion and muscle activity |
US6421222B1 (en) * | 2000-01-11 | 2002-07-16 | Warson Group, Inc. | Precision fail-safe electrostatic dissipating device |
-
2000
- 2000-09-28 US US09/671,138 patent/US6549391B1/en not_active Expired - Lifetime
-
2001
- 2001-09-13 AU AU2001291554A patent/AU2001291554A1/en not_active Abandoned
- 2001-09-13 CA CA002367542A patent/CA2367542C/en not_active Expired - Fee Related
- 2001-09-13 EP EP01971558A patent/EP1320305A1/en not_active Ceased
- 2001-09-13 WO PCT/CA2001/001299 patent/WO2002026071A1/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2712099A (en) | 1955-06-28 | G legge | ||
GB1319294A (en) * | 1969-07-24 | 1973-06-06 | Dalton J A | Footwear soles |
DE3036263A1 (en) * | 1979-10-25 | 1981-04-30 | Jowa Holzschuhe GmbH & Co KG, Fieberbrunn, Tirol | Antistatic sole for wooden shoe - has holes in heel and instep through which electricity conductors pass, to be covered by layers |
US4366630A (en) | 1979-12-07 | 1983-01-04 | Aeci Limited | Foot wear |
FR2596257A1 (en) * | 1986-03-25 | 1987-10-02 | Lalet Sa Raoul | Article of footwear for eliminating static electricity |
US4785371A (en) | 1986-11-28 | 1988-11-15 | Interco Incorporated | Electrostatic dissipating footwear |
US5426870A (en) * | 1991-05-17 | 1995-06-27 | Phurness Pty. Ltd. | Antistatic shoe sole |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017199020A1 (en) * | 2016-05-19 | 2017-11-23 | N-Ion Sports Technology Limited | Grounding footwear |
US11246372B2 (en) | 2016-05-19 | 2022-02-15 | N-Ion Sports Technology Limited | Grounding footwear |
Also Published As
Publication number | Publication date |
---|---|
CA2367542A1 (en) | 2002-04-11 |
EP1320305A1 (en) | 2003-06-25 |
CA2367542C (en) | 2003-04-22 |
AU2001291554A1 (en) | 2002-04-08 |
US6549391B1 (en) | 2003-04-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2367542C (en) | Safety footwear | |
JP3270689B2 (en) | Footwear for electrostatic discharge | |
US2712099A (en) | G legge | |
EP1758477B1 (en) | Antistatic footwear | |
US7471497B1 (en) | Electrostatic discharge prevention device | |
JPH0516847B2 (en) | ||
US6421222B1 (en) | Precision fail-safe electrostatic dissipating device | |
US4785371A (en) | Electrostatic dissipating footwear | |
US3898538A (en) | Anti-static footwear | |
US7872847B2 (en) | Electric-charge protective equipment | |
US20100031537A1 (en) | Outsoles for esd type protective footwear and methods of manufacturing the same | |
US11517072B2 (en) | Adaptive electrostatic discharge and electric hazard footwear | |
KR200274092Y1 (en) | Shoes for static electricity prevention | |
CA1180891A (en) | Insulative mid-sole assembly | |
US20110072689A1 (en) | Electronic device for safety footwear | |
JP3527643B2 (en) | How to set antistatic shoes and insulation resistance | |
US20230413942A1 (en) | Electrically dissipative removable insole, particularly for professional work shoes | |
JP3088517U (en) | Footwear with multiple functions | |
WO2000004801A9 (en) | Electrostatically dissipative athletic shoe | |
JPS6116803Y2 (en) | ||
KR200370629Y1 (en) | Shoes protecting static electricity and electromagnetic waves | |
KR19980019929A (en) | Antistatic shoes | |
JPS6158601A (en) | Antistatic shoes and its production | |
JPS60158802A (en) | Electrostatic shoes | |
ITTV970014A1 (en) | TECHNICAL WORK SHOE, PARTICULARLY OF THE TYPE WITH ANTI-STATIC FUNCTION. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2367542 Country of ref document: CA Kind code of ref document: A Ref document number: 2367542 Country of ref document: CA |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ PH PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2001971558 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2001971558 Country of ref document: EP |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWR | Wipo information: refused in national office |
Ref document number: 2001971558 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2001971558 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP |