Dissipative system for safety garments

Patent metadata

Field	Value
Publication number	US-9955747-B2
Application number	US-201615082422-A
Country	US
Kind code	B2
Filing date	Mar 28, 2016
Priority date	Apr 2, 2015
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A system and overshoe for dissipating charge from a human body standing on a surface and wearing the system. The overshoe further contains a sole and an overshoe body that is attached to the edge of the sole such that the sole has an inner surface that faces the overshoe side and an outer surface that is exterior to the overshoe. A conductive strip is folded around at least a portion of the edge of the sole and bonded to the sole by a first adhesive such that at least a portion of the conductive strip is exposed to the inner surface of the sole. A tape covers the seam between the conductive strip and the sole on an exterior portion of the overshoe and that is adhesively bonded to the seam by a second adhesive such that at least a portion of the conductive strip is exposed to the surface that the human body is standing on.
The portion that is exposed to the surface that the human body is standing on is sufficient in area to yield a resistance of in the range of >10 4 to <10 8 Ohm when measured between the hands of the human body and the surface.

First claim

We claim:

1. A system for dissipating charge from a human body standing on a surface and wearing the system, said system comprising a dissipative overshoe, said overshoe further comprising;
I. a sole,
II. an overshoe body that is attached to the edge of the sole such that the sole has an inner surface that faces the overshoe side and an outer surface that is exterior to the overshoe,
III. a conductive strip folded around at least a portion of the edge of the sole and bonded to the sole by a first adhesive such that at least a portion of the conductive strip is exposed to the inner surface of the sole,
IV. a tape that covers the seam between the conductive strip and the sole on an exterior portion of the overshoe and that is adhesively bonded to the seam by a second adhesive such that at least a portion of the conductive strip is exposed to the surface that the human body is standing on;
wherein the portion that is exposed to the surface that the human body is standing on is sufficient in area to yield a resistance of in the range of >10 4 to <10 8 Ohm when measured between the hands of the human body and the surface.

2. The system of claim 1 in which the human body has a conductivity of between 10 6 and 10 8 (units).

3. The system of claim 1 in which at least a portion of the overshoe comprises a nonwoven web.

4. The system of claim 3 in which the nonwoven web is a plexifilamentary web.

5. The system of claim 1 in which the conductive strip comprises a contiguous layer of metalized plexifilamentary web.

6. The system of claim 1 in which the second adhesive is a hot melt adhesive.

7. The system of claim 1 in which the conductive strip comprises carbon particles.

8. An overshoe comprising;
I. a sole,
II. an overshoe body that is attached to the edge of the sole such that the sole has an inner surface that faces the overshoe side and an outer surface that is exterior to the overshoe,
III. a conductive strip folded around at least a portion of the edge of the sole and bonded to the sole by a first adhesive such that at least a portion of the conductive strip is exposed to the inner surface of the sole,
IV. a tape that covers the seam between the conductive strip and the sole on an exterior portion of the overshoe and that is adhesively bonded to the seam by a second adhesive such that at least a portion of the conductive strip is exposed to the surface that the human body is standing on.

Assignees

• Du Pont

Inventors

• Huebsch Eric
• Samaniego Muriel

Classifications

• A43B7/32 Primary

  with shock-absorbing means (resilient soles A43B13/18) · CPC title

• A43B7/36

  with earthing or grounding means · CPC title

• A43B3/163 Primary

  specially adapted for health or hygienic purposes, e.g. comprising electrically conductive material allowing the discharge of electrostatic charges · CPC title

• H05F3/02

  by means of earthing connections · CPC title