GB2180204A - Road vehicle earthing device - Google Patents
Road vehicle earthing device Download PDFInfo
- Publication number
- GB2180204A GB2180204A GB08522838A GB8522838A GB2180204A GB 2180204 A GB2180204 A GB 2180204A GB 08522838 A GB08522838 A GB 08522838A GB 8522838 A GB8522838 A GB 8522838A GB 2180204 A GB2180204 A GB 2180204A
- Authority
- GB
- United Kingdom
- Prior art keywords
- earthing
- earthing device
- strip
- vehicle
- end region
- 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- Withdrawn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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/06—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for removing electrostatic charges
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
An earthing device (1) for a motor vehicle is formed from a carbon black and ethylene copolymer compound having a low volume resistivity (typically 10 ohm cm) and a high tensile strength (typically 11 MPa). A plurality of apertures (5) are provided at one end to facilitate mounting of the device on the vehicle body, and the other end (4) is thickened to provide abrasion resistance. <IMAGE>
Description
SPECIFICATION
Road vehicle earthing device
This invention relates to a road vehicle earthing device, and more particularly to an earthing strip suit able for earthing static electricity from a private car or light van.
It has long been recognised as desirable to earth a
motor vehicle to prevent the build-up of static electric
charge on the vehicle. Early proposals, e.g. as descri
bed in patent specification GB 799408, made use of
metal leaf springs, but more recently it has been pro
posed to form the earthing device as a strip of an el ectrically conductive rubber material. However, tests
have shown that rubber compounds which were thought to have been satisfactory for the purpose do
not, as a practical matter, provide adequate earthing
of the vehicle body.Attempts have been made to im
prove the conductivity of rubber earthing strips by
incorporating in the strip metal wires, but this addsto manufacturing costs and, in any event, is of doubtful
use since the wire tendsto wear away more rapidly
than the rubber atthefree end of the strip, and ac
cordingly does not make reliable contact with the
road surface.
We have now discovered that a particular plastics
compound can be formed into an earthing strip of
suitable shape which is effective to earth a vehicle
body and prevent the build-up of the static electric
charge on the body.
The plastics compound which we have discovered issuitableforthe manufacture of earthing strips is
based on carbon black and an ethylene copolymer
and is formulated to give a very low volume re
sistivelywhich changes little during processing. Typ
ical volume resistivity is 10 ohmCm. Additionally, the
material has a high tensile strength (typically 11 M Pa
at break measured by ISO-R-527) and is thus satisfac
tory for use as an elongate strip. Earthing strips made ofthis material have been found to have adequate
abrasion resistance.
A particular example of a suitable compound is
sold by Cabot Plastics Ltd underthe designation
CABELEC 988. This material was designed for the
production of pipes, tubing and containers.
Accordingly, the present invention provides an
earthing device for a road vehicle, the device com
prising aflexiblememberformedofacompound comprising carbon black and an ethylene copolymer, theflexible member being connectabletothe road
vehicle and having a free end for engaging the road
surface and having an electrical resistance which
permits adequate earthing of static electric charge
from the vehicle body.
The invention will be better understood from the
following description of an embodiment thereof,
given by way of example only, reference being had to
the accompanying drawing wherein the single figure
shows an earthing device for a motor car.
Referring to the drawing, the earthing device 1
comprises a strip 2 moulded from CABELEC 988 hav
ing a normally upper end region 3forattachmenttoa vehicle body and a normally lower end region 4for ; engagement with the ground. The upper end region 3 is preferably provided with a series of apertures 5 whereby the effective length of the strip may be chosen to suit a particularvehiclebyboltingthestrip directly to the vehicle body, orto a clamp secured to the vehicle body, using a selected one of the apertu res 5 to receive the fixing bolt.
The lower end region 4 is preferably of longer cross-section than the central zone of the strip over at least part of its length to provide abrasion resistance.
In the embodiment shown the lower end region is in the form of an arrow head which is thicker than the adjacent portion of the strip.
1. An earthing device for a road vehicle,the de- vice comprising a flexible member formed of a compound comprising carbon black and an ethylene copolymer, the flexible member being connectable to the road vehicle and having a free end for engaging the road surface and having an electrical resistance which permits adequate earthing of static electric charge from the vehicle body.
2. An earthing device according to claim 1 wherein the compound from which the flexible member is formed has a volume resistivity of substantially 10 ohm cm, which volume resistivity does not substantially change during processing of the compound.
3. An earthing device according to claim 1 or claim 2 wherein the flexible member has a tensile strength ofsubstantially 11 M Pa at break measured by 1 50-R-527.
4. An earthing device according to any preceding claim wherein one end region oftheflexible member is providedwith a series of apertureswherebythe effective length oftheflexible member may be chosen to suit a particular vehicle by securing the flexible memberto the vehicle using a selected one ofthe apertures.
5. An earthing device according to claim 4 wherein the other end region oftheflexible member has a larger cross-sectional area than the central zone ofthe member.
6. An earthing device according to claim 5 wherein the said other end region is in the form of an arrow head.
7. An earthing device for a motor vehicle sub stantiallyas herein described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. An earthing device for a road vehicle,the de- vice comprising a flexible member formed of a compound comprising carbon black and an ethylene copolymer, the flexible member being connectable to the road vehicle and having a free end for engaging the road surface and having an electrical resistance which permits adequate earthing of static electric charge from the vehicle body.
2. An earthing device according to claim 1 wherein the compound from which the flexible member is formed has a volume resistivity of substantially 10 ohm cm, which volume resistivity does not substantially change during processing of the compound.
3. An earthing device according to claim 1 or claim 2 wherein the flexible member has a tensile strength ofsubstantially 11 M Pa at break measured by 1 50-R-527.
4. An earthing device according to any preceding claim wherein one end region oftheflexible member is providedwith a series of apertureswherebythe effective length oftheflexible member may be chosen to suit a particular vehicle by securing the flexible memberto the vehicle using a selected one ofthe apertures.
5. An earthing device according to claim 4 wherein the other end region oftheflexible member has a larger cross-sectional area than the central zone ofthe member.
6. An earthing device according to claim 5 wherein the said other end region is in the form of an arrow head.
7. An earthing device for a motor vehicle sub stantiallyas herein described with reference to the accompanying drawing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08522838A GB2180204A (en) | 1985-09-16 | 1985-09-16 | Road vehicle earthing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08522838A GB2180204A (en) | 1985-09-16 | 1985-09-16 | Road vehicle earthing device |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8522838D0 GB8522838D0 (en) | 1985-10-23 |
GB2180204A true GB2180204A (en) | 1987-03-25 |
Family
ID=10585226
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08522838A Withdrawn GB2180204A (en) | 1985-09-16 | 1985-09-16 | Road vehicle earthing device |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2180204A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017119927A1 (en) * | 2017-08-30 | 2019-02-28 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | motor vehicle |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114152351B (en) * | 2022-02-09 | 2022-05-24 | 深圳市海清视讯科技有限公司 | Electrostatic clamp installation detection method, device, equipment and storage medium |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1532350A (en) * | 1976-09-25 | 1978-11-15 | Stamicarbon | Electrically conducting thermoplastic elastomer mixtures |
GB2057372A (en) * | 1979-07-16 | 1981-04-01 | Takahashi S | Device for electrically grounding a vehicle |
-
1985
- 1985-09-16 GB GB08522838A patent/GB2180204A/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1532350A (en) * | 1976-09-25 | 1978-11-15 | Stamicarbon | Electrically conducting thermoplastic elastomer mixtures |
GB2057372A (en) * | 1979-07-16 | 1981-04-01 | Takahashi S | Device for electrically grounding a vehicle |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017119927A1 (en) * | 2017-08-30 | 2019-02-28 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | motor vehicle |
DE102017119927B4 (en) | 2017-08-30 | 2022-07-07 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Motor vehicle, method of operating a motor vehicle, grounding system and grounding stake |
Also Published As
Publication number | Publication date |
---|---|
GB8522838D0 (en) | 1985-10-23 |
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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) |