WO2009091236A1 - An electrostatic discharge shoe cover - Google Patents

An electrostatic discharge shoe cover Download PDF

Info

Publication number
WO2009091236A1
WO2009091236A1 PCT/MY2009/000015 MY2009000015W WO2009091236A1 WO 2009091236 A1 WO2009091236 A1 WO 2009091236A1 MY 2009000015 W MY2009000015 W MY 2009000015W WO 2009091236 A1 WO2009091236 A1 WO 2009091236A1
Authority
WO
WIPO (PCT)
Prior art keywords
shoe
electrostatic discharge
envelope
shoe cover
conductive strip
Prior art date
Application number
PCT/MY2009/000015
Other languages
French (fr)
Inventor
Kek Hing Kow
Original Assignee
Kek Hing Kow
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 Kek Hing Kow filed Critical Kek Hing Kow
Publication of WO2009091236A1 publication Critical patent/WO2009091236A1/en

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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
    • A43B3/16—Overshoes
    • A43B3/163—Overshoes specially adapted for health or hygienic purposes, e.g. comprising electrically conductive material allowing the discharge of electrostatic charges

Definitions

  • the present invention relates generally to a shoe cover, and more particularly to an electrostatic discharge shoe cover with improved configuration so as to provide a more efficient and reliable electrostatic discharge function.
  • electrostatic discharge attire and cover The purpose of electrostatic discharge attire and cover is well-known. There should be an electrical path whereby electrostatic charges reside on a human body can be discharged. Where a wearer wears a pair of electrostatic discharge shoes, the electrostatic charges can be appropriately discharged to the ground. However, in certain situation, it is desirable to cover up the shoes with a shoe cover for contamination control as well as to provide electrostatic discharge means.
  • a traditional electrostatic discharge shoe cover (10) comprises a shoe envelope (11) made from plastic material, with a flexible opening (12).
  • the shoe envelope (11) engulfs the entire shoe (20) worn by a wearer.
  • This loose tail (14) is simply tucked in between the foot (30) of a wearer and the insole (15) of the shoe (20), to achieve some sort of contact with the human body. Sometimes, the tail (14) slips off. From experience, it was also found that the contact was not satisfactory because the strip placed is "shifted" to the side of the insole after some walking activities.
  • the conductive strip can be of polymer or metallic material or a combination of both materials. Its electrical resistance is preferably in the range of 10 3 to 10 9 ohms, specifically in the range of 10 4 to 10 7 ohms.
  • adhesive means to fix or attach the free end or lose tail of the strip to the insole of the shoe.
  • adhesive means may include double sided self adhesive tape or coated pressure sensitive adhesive on one side of the strip that would stick or fixed on the insole.
  • such adhesive means may be efficient in so far as to attach the lose tail to the insole and thus preventing said lose tail from shifting inside the shoe, such approach possess shortcomings. This is primarily due to the fact that the adhesiveness may reduce substantially or at least gradually over a period of time, especially in the repeated use of such electrostatic discharge shoe cover. Consequently, the strip may not be attached appropriately and therefore shifted during use. In addition to this, the adhesive may cause staining or soiling of insole. Such condition may not be favorable or comfortable for the wearer. Especially in an ultra clean room electrostatic discharge sensitive manufacturing environment, such staining or the outgasing contaminants of the adhesive is not acceptable.
  • the present invention has, therefore, as a primary object to improve an electrostatic discharge shoe cover, so that the electrostatic discharge is made more efficient and reliable.
  • an electrostatic discharge shoe cover (40) comprising a shoe envelope (41) having an opening (42) and a conductive strip (43); characterized in that the strip (43) is attached to the shoe envelope (41) in a manner such that it forms a loop (44) across the opening (42); and said loop (44) is pressed downwards in a consistent manner such that it is in contact with the insole of a shoe during use of the shoe cover (40).
  • the object is achieved essentially in that a length of a conductive strip is sewn on the underside along a substantial length of a shoe envelope. Around the heel section, the conductive strip continues to be sewn upwards towards and along one side of the flexible opening. The loose end of the conductive strip is finally sewn on the other side of the flexible opening forming a loop.
  • This arrangement will allow consistent and precise position of the conductive loop when placed on the surface of the insole inside a shoe. Such conductive loop is then pressed down by the heel of the foot of a wearer, achieving maximum contact between the human body and the shoe for efficient and effective drainage of static electricity from body to ground.
  • Figure 1 shows a partial cross-sectional view of a traditional electrostatic discharge shoe cover with a loose tail of extra length of a conductive strip tucked in between the foot of a wearer and the insole of a shoe.
  • Figure 2 shows a perspective view of an improved electrostatic discharge shoe cover according to the present invention with its flexible opening being stretched.
  • Figure 3 shows a partial cross-sectional view of the improved electrostatic discharge shoe cover as shown in Figure 2 and a conductive loop being pressed down by the heel of a foot of a wearer.
  • the shoe cover (40) in accordance with a preferred embodiment of the present invention comprises of a plastic shoe envelope (41) and a conductive strip (43).
  • the shoe envelope (41) is provided with a flexible opening (42) as suitably shown in FIG 2.
  • the shoe cover is formed or made from plastic material which may include but not limiting to polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), nylon, polyethylene terephthalate (PET) or any other polymeric materials of the likes.
  • PP polypropylene
  • PE polyethylene
  • PVC polyvinyl chloride
  • nylon polyethylene terephthalate
  • PET polyethylene terephthalate
  • the flexible opening (42) is made flexible with the assistance of an elastic band.
  • the conductive strip (43) which is formed from any suitable conductive material is disposed over the flexible opening (42) in a manner such that it forms a loop (44) across the opening (42).
  • a length of a conductive strip (43) is sewn on the underside along a substantial length of the shoe envelope (41).
  • the conductive strip (43) continues to be sewn upwards towards and along one side of the flexible opening (42).
  • the loose end of the conductive strip is finally sewn on the other side of the flexible opening (42) thereby forming a loop (44).
  • the strip may be disposed or attached by other various suitable means besides sewing, including but not limiting to suitable fastening means, adhesive means, or suitable forms of sealing.
  • FIG. 3 One way of using the improved electrostatic discharge shoe cover (40) is accordingly shown in Figure 3.
  • a shoe (20) is inserted into the flexible opening (42) and the shoe envelope (41) engulfs the entire shoe (20).
  • the presence of the elastic band along the opening (42) of the shoe envelope provides a gripping effect to the shoe of the wearer.
  • the conductive loop (44) is next disposed on top the insole (15) of the shoe (20).
  • the wearer places his or her foot (30) into the shoe (20).
  • the conductive loop (44) is thereby pressed down by the heel of the foot (30) thus allowing continuous contact of the conductive loop (44) to the ground during use, due to the pressure provided by the weight of the wearer.
  • the conductive strip (43) achieves the function of discharging the electrostatic charges from the human body to the ground, when the wearer steps on an anti-static or conductive floor.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

An electrostatic discharge shoe cover (40) comprises a shoe envelope (41) having a flexible opening (42) and a conductive strip (43), whereby during use the shoe envelope (41) is formed for engulfing a shoe (20). It is further provided that the conductive strip (43) sewn on the underside of the shoe envelope (41). According to the present invention, one length of the conductive strip (43) is sewn on the underside along a substantial length of the shoe envelope (41). Around the heel section, the conductive strip (43) continues to be sewn upwards towards and along one side of the flexible opening (42). The loose end of the conductive strip is finally sewn on the other side of the flexible opening (42) forming a loop (44). The loop (44) so formed is pressed down by the heel of the foot (30) of a wearer, when the shoe is worn.

Description

AN ELECTROSTATIC DISCHARGE SHOE COVER
FIELD OF THE INVENTION
The present invention relates generally to a shoe cover, and more particularly to an electrostatic discharge shoe cover with improved configuration so as to provide a more efficient and reliable electrostatic discharge function.
BACKGROUND OF INVENTION
The purpose of electrostatic discharge attire and cover is well-known. There should be an electrical path whereby electrostatic charges reside on a human body can be discharged. Where a wearer wears a pair of electrostatic discharge shoes, the electrostatic charges can be appropriately discharged to the ground. However, in certain situation, it is desirable to cover up the shoes with a shoe cover for contamination control as well as to provide electrostatic discharge means.
As seen in Figure 1, a traditional electrostatic discharge shoe cover (10) comprises a shoe envelope (11) made from plastic material, with a flexible opening (12). The shoe envelope (11) engulfs the entire shoe (20) worn by a wearer. Underneath the shoe envelope (11), a length of a conductive strip (13) is sewn along its length, with a loose tail (14) of extra length of the conductive strip. This loose tail (14) is simply tucked in between the foot (30) of a wearer and the insole (15) of the shoe (20), to achieve some sort of contact with the human body. Sometimes, the tail (14) slips off. From experience, it was also found that the contact was not satisfactory because the strip placed is "shifted" to the side of the insole after some walking activities. The conductive strip can be of polymer or metallic material or a combination of both materials. Its electrical resistance is preferably in the range of 103 to 109 ohms, specifically in the range of 104 to 107 ohms.
One of the prominent solutions with respect to the drawback of the existing electrostatic discharge shoe cover as elucidated in the preceding paragraph at present is the utilization of adhesive means to fix or attach the free end or lose tail of the strip to the insole of the shoe. It is noted that adhesive means may include double sided self adhesive tape or coated pressure sensitive adhesive on one side of the strip that would stick or fixed on the insole.
Whilst such adhesive means may be efficient in so far as to attach the lose tail to the insole and thus preventing said lose tail from shifting inside the shoe, such approach possess shortcomings. This is primarily due to the fact that the adhesiveness may reduce substantially or at least gradually over a period of time, especially in the repeated use of such electrostatic discharge shoe cover. Consequently, the strip may not be attached appropriately and therefore shifted during use. In addition to this, the adhesive may cause staining or soiling of insole. Such condition may not be favorable or comfortable for the wearer. Especially in an ultra clean room electrostatic discharge sensitive manufacturing environment, such staining or the outgasing contaminants of the adhesive is not acceptable.
Existing prior arts have yet to effectively solve the shortcomings in relation to the said criteria.
Accordingly, the aforementioned shortcomings have led to the development of the present invention, which is directed to resolve and thus eliminate the above shortcomings.
It is therefore a primary object of the present invention to provide an electrostatic disharge shoe cover with improved efficiency and cleanliness in relation to the electrostatic discharge capability.
It is yet another object of the present invention to provide an electrostatic discharge shoe cover which enables continuous contact of the conductive strip to the ground and thereby allowing effective electrostatic discharge. It is a further object of the present invention to provide an electrostatic discharge shoe cover having a conductive strip which is uniquely fixed and permanently prevented from shifting within the shoe during use.
It is yet a further object of the present invention to provide an electrostatic discharge shoe cover which provides a hygienic and enduring approach of preventing the conductive strip from shifting and to be in continous contact with the ground during use.
Further objects and advantages of the present invention may become apparent upon referring to the preferred embodiments of the present invention as shown in the accompanying drawings and the following description.
SUMMARY OF THE INVENTION
The present invention has, therefore, as a primary object to improve an electrostatic discharge shoe cover, so that the electrostatic discharge is made more efficient and reliable.
There is provided an electrostatic discharge shoe cover (40) comprising a shoe envelope (41) having an opening (42) and a conductive strip (43); characterized in that the strip (43) is attached to the shoe envelope (41) in a manner such that it forms a loop (44) across the opening (42); and said loop (44) is pressed downwards in a consistent manner such that it is in contact with the insole of a shoe during use of the shoe cover (40).
The object is achieved essentially in that a length of a conductive strip is sewn on the underside along a substantial length of a shoe envelope. Around the heel section, the conductive strip continues to be sewn upwards towards and along one side of the flexible opening. The loose end of the conductive strip is finally sewn on the other side of the flexible opening forming a loop. This arrangement will allow consistent and precise position of the conductive loop when placed on the surface of the insole inside a shoe. Such conductive loop is then pressed down by the heel of the foot of a wearer, achieving maximum contact between the human body and the shoe for efficient and effective drainage of static electricity from body to ground.
BRIEF DESCRIPTION OF THE DRAWINGS In order that the present invention may be more readily understood, the following description is given, by way of example, of one specific embodiment of an improved electrostatic discharge shoe cover. Reference will be made to the accompanying drawings, in which:
Figure 1 shows a partial cross-sectional view of a traditional electrostatic discharge shoe cover with a loose tail of extra length of a conductive strip tucked in between the foot of a wearer and the insole of a shoe.
Figure 2 shows a perspective view of an improved electrostatic discharge shoe cover according to the present invention with its flexible opening being stretched.
Figure 3 shows a partial cross-sectional view of the improved electrostatic discharge shoe cover as shown in Figure 2 and a conductive loop being pressed down by the heel of a foot of a wearer.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE PRESENT INVENTION
In line with the above summary, the following description of a number of specific and alternative embodiments is provided to understand the inventive features of the present invention. It shall be apparent to one skilled in the art, however that this invention may be practiced without such specific details. Some of the details may not be described at length so as not to obscure the invention. For ease of reference, common reference numerals will be used throughout the figures when referring to the same or similar features common to the figures. The shoe cover (40) in accordance with a preferred embodiment of the present invention comprises of a plastic shoe envelope (41) and a conductive strip (43). The shoe envelope (41) is provided with a flexible opening (42) as suitably shown in FIG 2. It is noted that the shoe cover is formed or made from plastic material which may include but not limiting to polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), nylon, polyethylene terephthalate (PET) or any other polymeric materials of the likes. The flexible opening (42) is made flexible with the assistance of an elastic band.
The conductive strip (43) which is formed from any suitable conductive material is disposed over the flexible opening (42) in a manner such that it forms a loop (44) across the opening (42).
Accordingly, a length of a conductive strip (43) is sewn on the underside along a substantial length of the shoe envelope (41). Around the heel section, the conductive strip (43) continues to be sewn upwards towards and along one side of the flexible opening (42). The loose end of the conductive strip is finally sewn on the other side of the flexible opening (42) thereby forming a loop (44). It is understood that the strip may be disposed or attached by other various suitable means besides sewing, including but not limiting to suitable fastening means, adhesive means, or suitable forms of sealing.
One way of using the improved electrostatic discharge shoe cover (40) is accordingly shown in Figure 3. A shoe (20) is inserted into the flexible opening (42) and the shoe envelope (41) engulfs the entire shoe (20). The presence of the elastic band along the opening (42) of the shoe envelope provides a gripping effect to the shoe of the wearer. The conductive loop (44) is next disposed on top the insole (15) of the shoe (20). The wearer then places his or her foot (30) into the shoe (20). The conductive loop (44) is thereby pressed down by the heel of the foot (30) thus allowing continuous contact of the conductive loop (44) to the ground during use, due to the pressure provided by the weight of the wearer.
It is important to note that the weight of the wearer would automatically press hard upon the loop (44). The conductive strip (43) achieves the function of discharging the electrostatic charges from the human body to the ground, when the wearer steps on an anti-static or conductive floor.
It is further noted that as opposed to using adhesive means for attaching to the insole of the wearer's shoe, the approach of sewing the conductive strip to form a conductive loop provides a more hygienic, consistent and enduring way to drain away static charge from human body to the underneath of the shoe envelope. Therefore, shifting of strip (43) within the shoe and soiling of shoe insole due to adhesive means will not be experienced by the wearer.
While specific embodiments have been described and illustrated, it is understood that many changes, modifications, variations and combinations thereof could be made to the present invention without departing from the scope of the invention

Claims

1. An electrostatic discharge shoe cover (40) comprising a shoe envelope (41) having an opening (42) and a conductive strip (43); characterized in that the strip (43) is attached to the shoe envelope (41) in a manner such that it forms a loop (44) across the opening (42); and said loop (44) is pressed downwards in a manner such that it is in contact with the insole of a shoe during use.
2.The electrostatic discharge shoe cover (40) as claimed in Claim 1 wherein the strip (43) is attached to the underside of the shoe envelope (41), along the substantial length of the shoe envelope (41) and towards the flexible opening (42).
3. The electrostatic discharge shoe cover (40) as claimed in anyone of Claims 1 to 2, wherein the strip (43) is attached around the heel section of the shoe envelope (41) of the shoe cover (40) and along one side of the opening (42).
4. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 3 wherein the loose end of the strip (43) is extended across the opening (42) and thus attached to other side of the opening (42) thereby forming a loop (44).
5. The electrostatic discharge shoe cover (40) as claimed in Claim 1 to 4 wherein the loop (44) is pressed downwards by the heel of the foot of a wearer.
6. The electrostatic shoe cover (40) as claimed in Claim 1 wherein the opening (42) is formed to be elastic or with flexibility.
7. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 6 wherein the conductive strip (43) is detachably attached to the shoe envelope (41) of the shoe cover (40).
8. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 7 wherein the conductive strip (43) is permanently attached to the shoe envelope (41) of the shoe cover (40).
9. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 8 wherein the conductive strip (43) is sewn to the shoe envelope (41) of the shoe cover (40).
10. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 9 wherein the conductive strip (43) is attached to the shoe envelope (41) with adhesive means.
11. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 10 wherein the conductive strip (43) is attached to the shoe envelope (41) with sealing means.
12. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 11 wherein the shoe envelope (41) is formed from plastic.
13. The electrostatic discharge shoe cover (40) as claimed in Claims 1 to 12 wherein the shoe envelope (41) is formed from polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), nylon, polyethylene terephthalate (PET) or any other polymeric materials of the likes
PCT/MY2009/000015 2008-01-18 2009-01-16 An electrostatic discharge shoe cover WO2009091236A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYUI20080101 2008-01-18
MYPI20080101 2008-01-18

Publications (1)

Publication Number Publication Date
WO2009091236A1 true WO2009091236A1 (en) 2009-07-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/MY2009/000015 WO2009091236A1 (en) 2008-01-18 2009-01-16 An electrostatic discharge shoe cover

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Country Link
WO (1) WO2009091236A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011088758A1 (en) * 2010-01-19 2011-07-28 大科防静电技术咨询（深圳）有限公司 Antistatic shoes
WO2013056440A1 (en) * 2011-10-20 2013-04-25 Esd Technology Consulting & Licensing Co., Ltd Electrostatic discharge shoe assembly and electrostatic discharge shoe grounding accessory thereof
CN103889260A (en) * 2011-10-20 2014-06-25 大科防静电技术咨询（深圳）有限公司 Electrostatic discharge shoe assembly and electrostatic discharge shoe grounding accessory thereof
US20160286893A1 (en) * 2015-04-02 2016-10-06 E I Du Pont De Nemours And Company Dissipative system for safety garments

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0133319Y1 (en) * 1996-05-03 1999-01-15 정형희 Shoes
US6003247A (en) * 1997-05-23 1999-12-21 Steffe; Daniel D. Anti-static boot having a conductive upper
US20040128864A1 (en) * 2002-11-15 2004-07-08 Hirokazu Kimura Static electricity removing tool for footwear bottom, static electricity removing footwear bottom and electricity removing method of footwear bottom
KR200426067Y1 (en) * 2006-06-09 2006-09-19 김두원 Disposable footwear cover

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0133319Y1 (en) * 1996-05-03 1999-01-15 정형희 Shoes
US6003247A (en) * 1997-05-23 1999-12-21 Steffe; Daniel D. Anti-static boot having a conductive upper
US20040128864A1 (en) * 2002-11-15 2004-07-08 Hirokazu Kimura Static electricity removing tool for footwear bottom, static electricity removing footwear bottom and electricity removing method of footwear bottom
KR200426067Y1 (en) * 2006-06-09 2006-09-19 김두원 Disposable footwear cover

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011088758A1 (en) * 2010-01-19 2011-07-28 大科防静电技术咨询（深圳）有限公司 Antistatic shoes
CN102740939A (en) * 2010-01-19 2012-10-17 大科防静电技术咨询（深圳）有限公司 Antistatic shoes
CN102740939B (en) * 2010-01-19 2014-12-31 大科防静电技术咨询（深圳）有限公司 Antistatic shoes
WO2013056440A1 (en) * 2011-10-20 2013-04-25 Esd Technology Consulting & Licensing Co., Ltd Electrostatic discharge shoe assembly and electrostatic discharge shoe grounding accessory thereof
WO2013056682A1 (en) * 2011-10-20 2013-04-25 Esd Technology Consulting & Licensing Co., Ltd Electrostatic discharge shoe assembly and electrostatic discharge shoe grounding accessory thereof
CN103889260A (en) * 2011-10-20 2014-06-25 大科防静电技术咨询（深圳）有限公司 Electrostatic discharge shoe assembly and electrostatic discharge shoe grounding accessory thereof
CN103889260B (en) * 2011-10-20 2015-11-25 大科防静电技术咨询（深圳）有限公司 The set of static discharge footwear and static discharge footwear ground connection accessory thereof
US20160286893A1 (en) * 2015-04-02 2016-10-06 E I Du Pont De Nemours And Company Dissipative system for safety garments
US9955747B2 (en) * 2015-04-02 2018-05-01 E I Du Pont De Nemours And Company Dissipative system for safety garments

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