CA1162597A - Grounding strap - Google Patents
Grounding strapInfo
- Publication number
- CA1162597A CA1162597A CA000380825A CA380825A CA1162597A CA 1162597 A CA1162597 A CA 1162597A CA 000380825 A CA000380825 A CA 000380825A CA 380825 A CA380825 A CA 380825A CA 1162597 A CA1162597 A CA 1162597A
- Authority
- CA
- Canada
- Prior art keywords
- section
- bent
- bight portion
- leg portion
- bent section
- 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.)
- Expired
Links
- 239000002184 metal Substances 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 238000009434 installation Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
- H01R4/643—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for rigid cylindrical bodies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/60—Connections between or with tubular conductors
Landscapes
- Supports For Pipes And Cables (AREA)
- Clamps And Clips (AREA)
Abstract
ABSTRACT
A one-piece pliable metal grounding strap comprises a U-shaped section having a pair of leg portions inter-connected by a bight portion. One of the leg portions has an inwardly bent section extending adjacent thereof and across the bight portion, the bent section being adapted to contact on one side thereof a ground member; a hook member outwardly projects from this leg portion. A collar member is fixed to the bight portion, the collar member having a threaded bore adapted to threadably engage a screw member and being disposed to permit the screw member to frictionally engage the bent section on the other side thereof substantially perpendicularly thereto. The other leg portion is extended relative to the aforesaid one leg portion to define an elongated wrap section adapted to be bent about the ground member and over the one leg portion and the bight portion with the ground member disposed between the bent section and the wrap section; the wrap section is provided with a plurality of longitudinally spaced apart apertures adapted to receive the hook member and to register with the threaded bore for receiving the screw member. Tightening of the screw member causes same to frictionally engage with the bent section against the ground member and to move the bight portion in a direction away from the bent portion, thereby causing the hook member to pull the wrap section in the same direction and to tighten same against the ground member.
A one-piece pliable metal grounding strap comprises a U-shaped section having a pair of leg portions inter-connected by a bight portion. One of the leg portions has an inwardly bent section extending adjacent thereof and across the bight portion, the bent section being adapted to contact on one side thereof a ground member; a hook member outwardly projects from this leg portion. A collar member is fixed to the bight portion, the collar member having a threaded bore adapted to threadably engage a screw member and being disposed to permit the screw member to frictionally engage the bent section on the other side thereof substantially perpendicularly thereto. The other leg portion is extended relative to the aforesaid one leg portion to define an elongated wrap section adapted to be bent about the ground member and over the one leg portion and the bight portion with the ground member disposed between the bent section and the wrap section; the wrap section is provided with a plurality of longitudinally spaced apart apertures adapted to receive the hook member and to register with the threaded bore for receiving the screw member. Tightening of the screw member causes same to frictionally engage with the bent section against the ground member and to move the bight portion in a direction away from the bent portion, thereby causing the hook member to pull the wrap section in the same direction and to tighten same against the ground member.
Description
~162~97 The present invention relates to a grounding strap and, more particularly, to a pliable metal grounding strap of the type to be bent around a ground member, such as a grounded pipe or metal post, and thereafter secured thereto.
One type of pliable metal grounding strap which has been proposed before comprises an elongated strap member having a plurality of longitudinally spaced apart holes at one end portion and a nut welded thereon at the other end portion. A flap is detachably mounted to the strap member by means of a tab and slot arrangement adjacent the nut and is adapted to be positioned intermediate the ground member and a bolt extending through the nut for securing the strap member to the ground member, prior to bending the strap member around the ground member and over the nut with one strap hole registering with the nut hole and installing the bolt. This two-piece construction is rather disadvantageous since it is difficult and time consuming to install. Further, the flap serving to provide grounding contact between the bolt and the ground member and also to protect the latter from being damaged by the bolt can be easily lost. In addition, since the nut is welded to the strap member, the weld can readily break as a result of repeated use and bending of the strap member.
In order to overcome these disadvantages, Applicant has already proposed a pliable metal grounding strap of the type described above, but in which the welded nut is re-placed by a threaded collar riveted to the strap member and the detachable flap is replaced by an inwardly curved strap section integrally joined to one end of the strap .,~.
116Z~g7 member so as to provide a one-piece construction. ~owever, as the curved strap section must first be placed on the ground member and the strap member thereafter bent over such curved section and around the ground member, the bolt or screw is often mispositioned relative to the underlying curved strap section and contacts same at an oblique angle, resulting in a poor grounding contact.
Accordingly, it is an object of this invention to overcome the aforementioned drawback and to provide a one-piece pliable metal grounding strap which avoids misp~sitioningof the screw and therefore ensures a good grounding.
In accordance with the present invention, there is thus provided a one-piece pliable metal grounding strap comprising a U-Shaped section having a pair of leg portions interconnected by a bight portion. One of the leg portions has an inwardly bent section extending adjacent thereof and across the bight portion, the bent section being adapted to contact on one side thereof a ground member, a hook member outwardly projects from this leg portion. A collar member is fixed to the bight portion, the collar member having a threaded bore adapted to threadably engage a screw member and being disposed to permit the screw member to frictionally engage the bent section on the other side thereof substantially perpendicularly thereto. The other leg portion is extended relative to the aforesaid one leg portion to define an elongated wrap section adapted to be bent about the ground member and over the one leg portion and the bight portion with the ground member disposed between the bent section and the wrap section' the wrap section is provided with a plurality of longitudinally spaced apart apertures adapted to receive the hook member and to register with the treaded bore for receiving the screw member. Tight-ening of the screw member causes same to frictionally engage ~l~Z5~
with the bent section against the ground member and to move the bight portion in a direction away from the bent portion, thereby causiny the hook member to pull the wrap section in the same direction and to tighten same against the ground member.
By disposing the collar member on the bight portion of a preformed U-shaped strap section directly over-lying the inwardly bent strap section, such that the screw member frictionally engages the bent section substantially perpendicularly thereto, there is no longer any possibility of the screw member being mispositioned and thus proper grounding is ensured whenever the grounding strap of the invention is installed.
The invention is illustrated by way of example in the accompanying drawings, in which:
Fig. 1 is a perspective view of a grounding strap according to the invention as seen positioned on a ground member for installation thereon, Fig. 2 is a view similar to that of Fig. 1, showing the grounding strap in a first stage of its installation, Fig. 3 is a part sectional view showing the grounding strap in a second stage of its installation, Fig. 4 is a part sectional side elevation view showing the grounding strap in a third stage of its installation, and Fig. 5 is another part sectional side elevation view showing the grounding strap as finally installed on the ground member.
Referring first to Fig. 1, the grounding strap illustrated and generally designated by reference numeral ~6;~
10 is seen positioned for installation a ground member such as a grounded metal pipe 12 represented in broken lines. The grounding strap 10 is a one-piece copper pre~ormed construction comprising a U-shaped section having a pair of curved leg portions 14 and 16 interconnected by a planar bight portion 18. The leg portion 14 is provided with an inwardly curved section 20 also of U-shape extend-ing across the bight portion 18 and having one end integrally joined to leg portion 14 and the other end extending adjacent leg portion 16~ As shown, the curved section is adapted to contact on its innerside the grounded pipe 12.
A hook 22 outwardly projects from leg portion 14. A collar 24 is riveted to the bight portion 18 on the side thereof facing the curved section 20. The collar 24 has a threaded bore 26 adapted to threadably engage the threaded shank of screw member such as a bolt 28 and is disposed to permit the bolt 28 to frictionally engage the curved section 20 on its outerside perpendicularly thereto, as best shown in Figs. 3 and 5.
The leg portion 16 is extended relative to leg portion 14 so as to define an elongated wrap section 30 adapted to bent about the ground member 12 and over the leg portion 14 and the bight portion 18 with the ground member 12 disposed between the curved section 20 and the wrap section 30. The wrap section 30 is provided with a plurali-ity of longitudinally spaced apart holes 32 adapted to receive the hook 22 and also to register with the threaded bore 26 of collar 24 for receiving the bolt 28. A lock nut 34 and washer 36 complete the assembly.
In order to install the grounding strap 10 on the grounded pipe 12, the curved section 20 of the strap is ~6~S~7 first placed on the pipe 12, as shown in Fig. 1. Next, the wrap section 30 is bent around the pipe 12 and over the leg portion 14 while pressing it against the pipe in order to ensure a snug fit, as shown in Fig. 2; the strap hole 32 in closest alignment with the hook 22 is placed over the hook so as to connect the wrap section 30 to the leg portion 14. The bolt 28, lock nut 34 and washer3~ are removed and the wrap section 30 is further bent over the bight portion 18 so that another strap hole 32 registers with the treaded bore 26 of collar 24, as best shown in Fig. 3. The bolt, nut and washer assembly is reinstalled and any extra length of the wrap section 30 is bent over the leg portion 16. ~ereafter, as shown in Fig. 4, the bolt 28 is tightened so as to frictionally engage with the curved section 20 against the pipe 12, as a result, the bight portion 18 is moved in a direction away from the curved section 20, which causes the hook 22 carried by the leg portion 14 to pull the wrap section 30 in the same direction and to thereby snugly tighten same against the pipe 12. The final shape of the strap thus installed is represented in Fig. 5 and it is seen that the curved section 20 and wrap section 30 of the strap snugly conform to the pipe 12 and thus provide good grounding, the shank of the bolt 28 extend-ing perpendicularly to the curved section 20. A ground wire 38 is placed between the lock nut 34 and washer 36 and the nut is finally tightly secured.
As an example of dimensions of a suitable grounding strap 10, the overall length may be about 5 inches and the width about 1/2 inch. Such a grounding strap accomodates pipe diameters of 1/2 through 1 1/4 inch. As it is apparent, it provides a versatile mechanical and electrical connection for grounding to metal pipes or posts, in addition to being fast and easy to install.
One type of pliable metal grounding strap which has been proposed before comprises an elongated strap member having a plurality of longitudinally spaced apart holes at one end portion and a nut welded thereon at the other end portion. A flap is detachably mounted to the strap member by means of a tab and slot arrangement adjacent the nut and is adapted to be positioned intermediate the ground member and a bolt extending through the nut for securing the strap member to the ground member, prior to bending the strap member around the ground member and over the nut with one strap hole registering with the nut hole and installing the bolt. This two-piece construction is rather disadvantageous since it is difficult and time consuming to install. Further, the flap serving to provide grounding contact between the bolt and the ground member and also to protect the latter from being damaged by the bolt can be easily lost. In addition, since the nut is welded to the strap member, the weld can readily break as a result of repeated use and bending of the strap member.
In order to overcome these disadvantages, Applicant has already proposed a pliable metal grounding strap of the type described above, but in which the welded nut is re-placed by a threaded collar riveted to the strap member and the detachable flap is replaced by an inwardly curved strap section integrally joined to one end of the strap .,~.
116Z~g7 member so as to provide a one-piece construction. ~owever, as the curved strap section must first be placed on the ground member and the strap member thereafter bent over such curved section and around the ground member, the bolt or screw is often mispositioned relative to the underlying curved strap section and contacts same at an oblique angle, resulting in a poor grounding contact.
Accordingly, it is an object of this invention to overcome the aforementioned drawback and to provide a one-piece pliable metal grounding strap which avoids misp~sitioningof the screw and therefore ensures a good grounding.
In accordance with the present invention, there is thus provided a one-piece pliable metal grounding strap comprising a U-Shaped section having a pair of leg portions interconnected by a bight portion. One of the leg portions has an inwardly bent section extending adjacent thereof and across the bight portion, the bent section being adapted to contact on one side thereof a ground member, a hook member outwardly projects from this leg portion. A collar member is fixed to the bight portion, the collar member having a threaded bore adapted to threadably engage a screw member and being disposed to permit the screw member to frictionally engage the bent section on the other side thereof substantially perpendicularly thereto. The other leg portion is extended relative to the aforesaid one leg portion to define an elongated wrap section adapted to be bent about the ground member and over the one leg portion and the bight portion with the ground member disposed between the bent section and the wrap section' the wrap section is provided with a plurality of longitudinally spaced apart apertures adapted to receive the hook member and to register with the treaded bore for receiving the screw member. Tight-ening of the screw member causes same to frictionally engage ~l~Z5~
with the bent section against the ground member and to move the bight portion in a direction away from the bent portion, thereby causiny the hook member to pull the wrap section in the same direction and to tighten same against the ground member.
By disposing the collar member on the bight portion of a preformed U-shaped strap section directly over-lying the inwardly bent strap section, such that the screw member frictionally engages the bent section substantially perpendicularly thereto, there is no longer any possibility of the screw member being mispositioned and thus proper grounding is ensured whenever the grounding strap of the invention is installed.
The invention is illustrated by way of example in the accompanying drawings, in which:
Fig. 1 is a perspective view of a grounding strap according to the invention as seen positioned on a ground member for installation thereon, Fig. 2 is a view similar to that of Fig. 1, showing the grounding strap in a first stage of its installation, Fig. 3 is a part sectional view showing the grounding strap in a second stage of its installation, Fig. 4 is a part sectional side elevation view showing the grounding strap in a third stage of its installation, and Fig. 5 is another part sectional side elevation view showing the grounding strap as finally installed on the ground member.
Referring first to Fig. 1, the grounding strap illustrated and generally designated by reference numeral ~6;~
10 is seen positioned for installation a ground member such as a grounded metal pipe 12 represented in broken lines. The grounding strap 10 is a one-piece copper pre~ormed construction comprising a U-shaped section having a pair of curved leg portions 14 and 16 interconnected by a planar bight portion 18. The leg portion 14 is provided with an inwardly curved section 20 also of U-shape extend-ing across the bight portion 18 and having one end integrally joined to leg portion 14 and the other end extending adjacent leg portion 16~ As shown, the curved section is adapted to contact on its innerside the grounded pipe 12.
A hook 22 outwardly projects from leg portion 14. A collar 24 is riveted to the bight portion 18 on the side thereof facing the curved section 20. The collar 24 has a threaded bore 26 adapted to threadably engage the threaded shank of screw member such as a bolt 28 and is disposed to permit the bolt 28 to frictionally engage the curved section 20 on its outerside perpendicularly thereto, as best shown in Figs. 3 and 5.
The leg portion 16 is extended relative to leg portion 14 so as to define an elongated wrap section 30 adapted to bent about the ground member 12 and over the leg portion 14 and the bight portion 18 with the ground member 12 disposed between the curved section 20 and the wrap section 30. The wrap section 30 is provided with a plurali-ity of longitudinally spaced apart holes 32 adapted to receive the hook 22 and also to register with the threaded bore 26 of collar 24 for receiving the bolt 28. A lock nut 34 and washer 36 complete the assembly.
In order to install the grounding strap 10 on the grounded pipe 12, the curved section 20 of the strap is ~6~S~7 first placed on the pipe 12, as shown in Fig. 1. Next, the wrap section 30 is bent around the pipe 12 and over the leg portion 14 while pressing it against the pipe in order to ensure a snug fit, as shown in Fig. 2; the strap hole 32 in closest alignment with the hook 22 is placed over the hook so as to connect the wrap section 30 to the leg portion 14. The bolt 28, lock nut 34 and washer3~ are removed and the wrap section 30 is further bent over the bight portion 18 so that another strap hole 32 registers with the treaded bore 26 of collar 24, as best shown in Fig. 3. The bolt, nut and washer assembly is reinstalled and any extra length of the wrap section 30 is bent over the leg portion 16. ~ereafter, as shown in Fig. 4, the bolt 28 is tightened so as to frictionally engage with the curved section 20 against the pipe 12, as a result, the bight portion 18 is moved in a direction away from the curved section 20, which causes the hook 22 carried by the leg portion 14 to pull the wrap section 30 in the same direction and to thereby snugly tighten same against the pipe 12. The final shape of the strap thus installed is represented in Fig. 5 and it is seen that the curved section 20 and wrap section 30 of the strap snugly conform to the pipe 12 and thus provide good grounding, the shank of the bolt 28 extend-ing perpendicularly to the curved section 20. A ground wire 38 is placed between the lock nut 34 and washer 36 and the nut is finally tightly secured.
As an example of dimensions of a suitable grounding strap 10, the overall length may be about 5 inches and the width about 1/2 inch. Such a grounding strap accomodates pipe diameters of 1/2 through 1 1/4 inch. As it is apparent, it provides a versatile mechanical and electrical connection for grounding to metal pipes or posts, in addition to being fast and easy to install.
Claims (5)
1. A one-piece pliable metal grounding strap comprising:
- a U-shaped section having a pair of leg portions interconnected by a bight portion;
- one of said leg portions having an inwardly bent section extending adjacent thereof and across said bight portion, said bent section being adapted to contact on one side thereof a ground member;
- a hook member outwardly projecting from said one leg portion;
- a collar member fixed to said bight portion, said collar member having a threaded bore adapted to threadably engage a screw member and being disposed to permit said screw member to frictionally engage said bent section on the other side thereof substantially perpendicularly there-to;
- the other leg portion being extended relative to said one leg portion to define an elongated wrap section adapted to be bent about said ground member and over said one leg portion and said bight portion with said ground member disposed between said bent section and said wrap section, said wrap section being provided with a plurality of longitudinally spaced apart apertures adapted to receive said hook member and to register with said threaded bore for receiving said screw member, whereby tightening of said screw member causes same to frictionally engage with said bent section against said ground member and to move said bight portion in a direction away from said bent portion and thereby cause said hook member to pull said wrap section in the same direction and to tighten same against said ground member.
- a U-shaped section having a pair of leg portions interconnected by a bight portion;
- one of said leg portions having an inwardly bent section extending adjacent thereof and across said bight portion, said bent section being adapted to contact on one side thereof a ground member;
- a hook member outwardly projecting from said one leg portion;
- a collar member fixed to said bight portion, said collar member having a threaded bore adapted to threadably engage a screw member and being disposed to permit said screw member to frictionally engage said bent section on the other side thereof substantially perpendicularly there-to;
- the other leg portion being extended relative to said one leg portion to define an elongated wrap section adapted to be bent about said ground member and over said one leg portion and said bight portion with said ground member disposed between said bent section and said wrap section, said wrap section being provided with a plurality of longitudinally spaced apart apertures adapted to receive said hook member and to register with said threaded bore for receiving said screw member, whereby tightening of said screw member causes same to frictionally engage with said bent section against said ground member and to move said bight portion in a direction away from said bent portion and thereby cause said hook member to pull said wrap section in the same direction and to tighten same against said ground member.
2. A grounding strap according to claim 1, wherein said bent section is U-shaped and has one end integrally joined to said one leg portion and the other end extending adjacent said other leg portion.
3. A grounding strap according to claim 2, wherein said U-shaped bent section is an inwardly curved section.
4. A grounding strap according to claim 1, wherein said collar member is fixed to said bight portion on the side thereof facing said bent section.
5. A grounding strap according to claims 1 or 4, wherein said collar member is riveted to said bight portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000380825A CA1162597A (en) | 1981-06-29 | 1981-06-29 | Grounding strap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000380825A CA1162597A (en) | 1981-06-29 | 1981-06-29 | Grounding strap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1162597A true CA1162597A (en) | 1984-02-21 |
Family
ID=4120335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000380825A Expired CA1162597A (en) | 1981-06-29 | 1981-06-29 | Grounding strap |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1162597A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270316A (en) * | 2018-12-11 | 2019-09-24 | 齐齐哈尔大学 | Decolorising agent and preparation method thereof |
| CN111541056A (en) * | 2020-04-29 | 2020-08-14 | 广东电网有限责任公司东莞供电局 | Grounding wire connecting device |
-
1981
- 1981-06-29 CA CA000380825A patent/CA1162597A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110270316A (en) * | 2018-12-11 | 2019-09-24 | 齐齐哈尔大学 | Decolorising agent and preparation method thereof |
| CN110270316B (en) * | 2018-12-11 | 2022-06-24 | 齐齐哈尔大学 | Decoloring agent and preparation method thereof |
| CN111541056A (en) * | 2020-04-29 | 2020-08-14 | 广东电网有限责任公司东莞供电局 | Grounding wire connecting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |