CA2051515A1 - Transmission wire supporting crossarm - Google Patents
Transmission wire supporting crossarmInfo
- Publication number
- CA2051515A1 CA2051515A1 CA 2051515 CA2051515A CA2051515A1 CA 2051515 A1 CA2051515 A1 CA 2051515A1 CA 2051515 CA2051515 CA 2051515 CA 2051515 A CA2051515 A CA 2051515A CA 2051515 A1 CA2051515 A1 CA 2051515A1
- Authority
- CA
- Canada
- Prior art keywords
- crossarm
- support
- stem
- supporting
- electrical
- 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.)
- Abandoned
Links
Abstract
ABSTRACT
A subtransmission electrical insulator crossarm support is made of nonconductive, corrosion resistant material and has an arcuate indentation formed on the upright member to facilitate connection with the supporting pole. Triangular flanges that extend outwardly and upwardly from the sides of the intersection of the vertical stem and the horizontal crossarm strengthen the assembly.
The electrical conductors are supported in grooves provided on the surface of the crossarm assembly and are fastened by insulated J bolts.
A subtransmission electrical insulator crossarm support is made of nonconductive, corrosion resistant material and has an arcuate indentation formed on the upright member to facilitate connection with the supporting pole. Triangular flanges that extend outwardly and upwardly from the sides of the intersection of the vertical stem and the horizontal crossarm strengthen the assembly.
The electrical conductors are supported in grooves provided on the surface of the crossarm assembly and are fastened by insulated J bolts.
Description
2 ~
The present invention relates generally to supporting members and more particularly to electric utilities transmission poles such as telephone poles, electric power poles, and the like.
The prior art has taught the use of supporting crossarm members which are made of wood and are fastened by means of an anchoring system to a supporting pole. The wooden structure of such crossarms causes them to suffer the effects of degradation and accordingly they must be replaced with uneconomic regularity. Furthermore, since the poles normally have a circular cross section, a separate fastening means is used to fasten the crossarm to the pole, and generally ensures an interfitting relationship between the circular cross section of the pole and the shape of the crossarm. These attaching and adapting means are also subject to degradation and quite frequent replacement. Additionally, transmission conductors are generally supported on separate insulating means attached to the crossarms, such as porcelain insulators and metal pins, further increasing the weight and cost, and requiring increased labour when the insulator shatters or requires replacement. In the art attempting to overcome the corrosion factor by using fibreglass and associated materials, drawbacks are still encountered since separate conductor carrying insulators are often still employed.
United States Patent 2,437,375 (Buxton) discloses a crossarm composed of plastic impregnated wood veneer using separate conductor carrying insulators. United States Patent 3,499,973 (Barnes) shows a triangular crossarm having an arcuate back and separate conductor supporting insulators. Canadian Patent 664,189 (Ritchie) discloses a crossarm composed of dielectric material with separate conductor support means bonded to the crossarm, and wherein the crossarm is designed to slide over the top diameter of a mounting pole.
It is an object of the present invention to provide a light weight, strong crossarm support, fabricated of corrosive resistant insulating material, shaped and structured in relation to the cross section of the supporting pole, to facilitate snug connection thereto thereby providing increased stability to the crossarm, thus seeking to inhibit the need for further stabilizing means.
It is a further object of the present invention to provide a crossarm support that is economical to install, and reduces the cost of removing accessory parts when wires must be moved or otherwise relocated.
It is yet a further object of the present invention to provide means whereby the use of insulators for supporting the electrical conductors is no longer required. The transmission wires are attached to the crossarm, thus seeking to inhibit the need for separate carrying means for the conductors.
According to one aspect of the present invention a transmission electrical insulator crossarm support for mounting on an utility pole comprise: a crossarm structure, fabricated substantially of a nonconductive, corrosion resistant material and having a generally concave mounting surface which substantially adapts to said utility pole lateral surface; securing means for fixing said crossarm structure to said utility pole; and attaching means for fastening the electrical conductors to said crossarm structure; wherein said crossarm structure is provided with supporting grooves, each accommodating an electrical conductor and wherein said attaching means fix the electrical conductor into said supporting grooves.
The crossarm structure of the present invention is made of weather and corrosion resistant, electrically nonconductive material and is dimensioned as required by the weight of conductors supported thereon and by the required insulation parameters (which depend on the voltage, on the conductors and on crossarm structure 2~
material). A proposed material for the crossarm structure is fibreglass which has the requîred strength and good electrically insulating characteristics. Other materials having the required characteristics may be employed.
In another preferred embodiment, an ultraviolet inhibitor for protection of the crossarm to ultraviolet sun radiation may also be used for extending the life of the structure. Furthermore, the crossarm structure can be suitably treated with fireproof substances for obtaining a fire resistant support for electrical wires. By the addition of these protective coatings to the crossarm, better insulating properties may be obtained along with an enhanced resistance to factors as overheat, water or moisture infiltration, etc.
Preferably, the crossarm structure is produced of a one piece material and, having a substantially rectangular cross-section throughout.
The structure may also optionally he manufactured with curvers moulded on and around each of the supporting arms or stem, for increasing the lateral surface thereof.
In this way, the distance between the electrical conductors measured over the arms and stem surface may increase keeping same dimensions of the arms and stem. The leakage paths of the surface currents are thus beneficially increased.
In the case of a three phase current transportation, the present invention comprises an inverted T-shape structure having a vertical stem and crossarms extending in both directions from the bottom of the stem.
On one face of the vertical stem and extending its entire length, a semi-circular groove shaped and adapted for connection to the mounting pole is provided. Two or more bolt openings vertically disposed above each other, pass from the front of the stem to the curved back, and serve as a means for attaching the crossarm to the mounting pole.
The crossarm support is fixed in a vertical position with 2 ~
the aid of the semicircular groove and thus minimizes the possibility of pivoting of the crossarm relative to the pole, thereby substantially avoiding the need for additional f ixing means such as the supporting forestays.
When the crossarm support is fastened to the mounting pole, the top of the stem extends above the top of the pole and provides means for attaching conductors thereto.
Alternatively, either one or two opposite sides of the extending stem may be provided with semicircular grooves for additional conductors.
Conductors may be fastened to the crossarm structure by means of J-shaped bolts in a manner such that the long arm of the J bolts passes through the crossarm and is fastened with washers and securing nuts and the short arm is received into the crossarm.
For a dead-end three phase connection, the conductors are fastened to the crossarm structure by use of ball link eye bolts. The use of porcelain type insulators is avoided since the arms themselves are made of nonconductive materials.
Additionally, the present invention may be used in pairs to support an increased number of conductors.
In the case of a single phase current transportation, only a vertical stem is mounted on the pole. A semi-circular mounting groove extends along the surface facing the pole. The two grooves for supporting the electrical conductors are formed transversely at the upper area of the stem and J bolts are used for securing the conductors.
The invention will be described hereafter with reference to the accompanying drawings, in which:
Figure 1 shows a perspective view of an embodiment of the present invention for a three phase current transportation crossarm support, mounted on a utility pole;
Figure 2 shows a top view of the embodiment of Figure l;
2 ~
Figure 3 shows a perspective view of another embodiment of the present invention for a mono-phase current transportation crossarm support mounted on a utility pole;
Figure 4 illustrates a front view of an embodiment for a three phase current transportation crossarm support provided with curvers; and Figures 5a-5b show two preferred embodiments of the curvers, moulded on the crossarm.
Referring to Figures 1, 2 and 4 of the accompanying drawings, the T-shaped crossarm support designated generally as 1 is shown with the top of the stem 2 extending from the top of the mounting pole. The T-shaped assembly may be of substantially rectangular cross-section or may be substantially square throughout and may be composed of fibreglass or similar material.
A semicircular groove 5 extends vertically along the lateral surface of the stem of the support 1 which will interface with the utility pole 4 when mounted thereon.
The groove 5 is shaped and dimensioned to conform generally with the portion of the surface of the pole to be received by the groove. Passing from the front of the vertical stem 2 to the semicircular groove 5, are two or more horizontally disposed bolt passages 6, for fastening the crossarm assembly to the pole 4. The crossarms 3 are fabricated as an integral unit of the vertical stem 2.
The upper portion of the stem 2 has conductor supporting grooves 7. Conductor gripping ridges 8 may be formed into the conductor supporting grooves 7. The conductor (not shown) is held in place by means of a J bolt 9. The long arm of the J bolt 9 extends through bolt hole 16 into the body of the stem 2 and the threaded section of the bolt 9 is fastened by means of washer 10, nut 11 and locking nut 12. The hole 15 receiving the short stem of the J bolt 9 may optionally extend through the body of stem 2, but should be of sufficient depth so as to allow the 2 ~
curved portion of the bolt to grip a conductor passing between it and the conductor supporting grooves 7.
Alternatively, the hole 15 may be used for the long arm of the J bolt and hole 16 for the short arm. C o n d u c t o r supporting grooves 7 are also located near the outside ends of the crossarms 3. These grooves may have gripping ridges 8 to better fix the conductor. On either side of conductor supporting grooves 7 are provided holes 15, 16 to receive the J bolts. The conductor is held in place by J bolts in the same manner as described above. Fibreglass armours are placed into the supporting grooves in order to improve the electrical insulation where the J bolt contacts the conductor. A fibreglass armour includes three quarters of the lateral surface of the conductor and is formed so as to be slipped over the conductor and arranged in the desired place.
Strain support wings 17 may be formed as separate units and inserted into appropriate receiving grooves (not shown) or may be formed as an integral part of the crossarm 3 and stem 2. The support wings 17 are triangular and are sheet like in shape and structure. Alternatively, the support wings 17 may be of triangular shape and formed of strips wherein the central portion of each wing has an opening to reduce wind drag. The crossarm 3 need not have the strain wings in every operable embodiment, but it is desirable to include them in the structure when the conductors are of heavier gauge, or when the next conductor support means is at an extended distance from the present one.
Figure 3 shows a perspective view for an embodiment where a mono-phase current transportation crossarm support is mounted on a utility pole. The crossarm structure is made of vertical stem 2 only. The stem is provided with the semicircular groove 5 (as in the embodiment of Figures 1 - 3) which will interface with the utility pole 4 when mounted thereon. The electrical 2~
conductors are supported in grooves 7 and fixed with J
bolts 9 and washer 10, nut 11 and locking nut 12.
In the embodiment of Figures 4 and 5 curvers 18 are moulded into the structure on crossarm 3 and stem 2.
The curvers 18 have a discoidal or saucer-like shape (see Figures 5a and 5b) and extend peripherally around the arms and stem. They are formed adjacent the conductor supporting grooves 7, for increasing the length of the surface leakage current path.
The curvers also assist in the shedding of water during rainfall, thereby accelerating the drying of the crossarm and stem and, in any event, reducing the amount ; of surface water thereon.
In a further embodiment, the conductor supporting grooves 7 may increase in diameter at their ends so as to facilitate the passage of conductors in the event the conductors approach the crossarm 3 or stem 2 at an angle.
It will be readily apparent to those skilled in the art that modifications and improvements may be made to the invention without departing from the essential scope of the invention taught herein.
The present invention relates generally to supporting members and more particularly to electric utilities transmission poles such as telephone poles, electric power poles, and the like.
The prior art has taught the use of supporting crossarm members which are made of wood and are fastened by means of an anchoring system to a supporting pole. The wooden structure of such crossarms causes them to suffer the effects of degradation and accordingly they must be replaced with uneconomic regularity. Furthermore, since the poles normally have a circular cross section, a separate fastening means is used to fasten the crossarm to the pole, and generally ensures an interfitting relationship between the circular cross section of the pole and the shape of the crossarm. These attaching and adapting means are also subject to degradation and quite frequent replacement. Additionally, transmission conductors are generally supported on separate insulating means attached to the crossarms, such as porcelain insulators and metal pins, further increasing the weight and cost, and requiring increased labour when the insulator shatters or requires replacement. In the art attempting to overcome the corrosion factor by using fibreglass and associated materials, drawbacks are still encountered since separate conductor carrying insulators are often still employed.
United States Patent 2,437,375 (Buxton) discloses a crossarm composed of plastic impregnated wood veneer using separate conductor carrying insulators. United States Patent 3,499,973 (Barnes) shows a triangular crossarm having an arcuate back and separate conductor supporting insulators. Canadian Patent 664,189 (Ritchie) discloses a crossarm composed of dielectric material with separate conductor support means bonded to the crossarm, and wherein the crossarm is designed to slide over the top diameter of a mounting pole.
It is an object of the present invention to provide a light weight, strong crossarm support, fabricated of corrosive resistant insulating material, shaped and structured in relation to the cross section of the supporting pole, to facilitate snug connection thereto thereby providing increased stability to the crossarm, thus seeking to inhibit the need for further stabilizing means.
It is a further object of the present invention to provide a crossarm support that is economical to install, and reduces the cost of removing accessory parts when wires must be moved or otherwise relocated.
It is yet a further object of the present invention to provide means whereby the use of insulators for supporting the electrical conductors is no longer required. The transmission wires are attached to the crossarm, thus seeking to inhibit the need for separate carrying means for the conductors.
According to one aspect of the present invention a transmission electrical insulator crossarm support for mounting on an utility pole comprise: a crossarm structure, fabricated substantially of a nonconductive, corrosion resistant material and having a generally concave mounting surface which substantially adapts to said utility pole lateral surface; securing means for fixing said crossarm structure to said utility pole; and attaching means for fastening the electrical conductors to said crossarm structure; wherein said crossarm structure is provided with supporting grooves, each accommodating an electrical conductor and wherein said attaching means fix the electrical conductor into said supporting grooves.
The crossarm structure of the present invention is made of weather and corrosion resistant, electrically nonconductive material and is dimensioned as required by the weight of conductors supported thereon and by the required insulation parameters (which depend on the voltage, on the conductors and on crossarm structure 2~
material). A proposed material for the crossarm structure is fibreglass which has the requîred strength and good electrically insulating characteristics. Other materials having the required characteristics may be employed.
In another preferred embodiment, an ultraviolet inhibitor for protection of the crossarm to ultraviolet sun radiation may also be used for extending the life of the structure. Furthermore, the crossarm structure can be suitably treated with fireproof substances for obtaining a fire resistant support for electrical wires. By the addition of these protective coatings to the crossarm, better insulating properties may be obtained along with an enhanced resistance to factors as overheat, water or moisture infiltration, etc.
Preferably, the crossarm structure is produced of a one piece material and, having a substantially rectangular cross-section throughout.
The structure may also optionally he manufactured with curvers moulded on and around each of the supporting arms or stem, for increasing the lateral surface thereof.
In this way, the distance between the electrical conductors measured over the arms and stem surface may increase keeping same dimensions of the arms and stem. The leakage paths of the surface currents are thus beneficially increased.
In the case of a three phase current transportation, the present invention comprises an inverted T-shape structure having a vertical stem and crossarms extending in both directions from the bottom of the stem.
On one face of the vertical stem and extending its entire length, a semi-circular groove shaped and adapted for connection to the mounting pole is provided. Two or more bolt openings vertically disposed above each other, pass from the front of the stem to the curved back, and serve as a means for attaching the crossarm to the mounting pole.
The crossarm support is fixed in a vertical position with 2 ~
the aid of the semicircular groove and thus minimizes the possibility of pivoting of the crossarm relative to the pole, thereby substantially avoiding the need for additional f ixing means such as the supporting forestays.
When the crossarm support is fastened to the mounting pole, the top of the stem extends above the top of the pole and provides means for attaching conductors thereto.
Alternatively, either one or two opposite sides of the extending stem may be provided with semicircular grooves for additional conductors.
Conductors may be fastened to the crossarm structure by means of J-shaped bolts in a manner such that the long arm of the J bolts passes through the crossarm and is fastened with washers and securing nuts and the short arm is received into the crossarm.
For a dead-end three phase connection, the conductors are fastened to the crossarm structure by use of ball link eye bolts. The use of porcelain type insulators is avoided since the arms themselves are made of nonconductive materials.
Additionally, the present invention may be used in pairs to support an increased number of conductors.
In the case of a single phase current transportation, only a vertical stem is mounted on the pole. A semi-circular mounting groove extends along the surface facing the pole. The two grooves for supporting the electrical conductors are formed transversely at the upper area of the stem and J bolts are used for securing the conductors.
The invention will be described hereafter with reference to the accompanying drawings, in which:
Figure 1 shows a perspective view of an embodiment of the present invention for a three phase current transportation crossarm support, mounted on a utility pole;
Figure 2 shows a top view of the embodiment of Figure l;
2 ~
Figure 3 shows a perspective view of another embodiment of the present invention for a mono-phase current transportation crossarm support mounted on a utility pole;
Figure 4 illustrates a front view of an embodiment for a three phase current transportation crossarm support provided with curvers; and Figures 5a-5b show two preferred embodiments of the curvers, moulded on the crossarm.
Referring to Figures 1, 2 and 4 of the accompanying drawings, the T-shaped crossarm support designated generally as 1 is shown with the top of the stem 2 extending from the top of the mounting pole. The T-shaped assembly may be of substantially rectangular cross-section or may be substantially square throughout and may be composed of fibreglass or similar material.
A semicircular groove 5 extends vertically along the lateral surface of the stem of the support 1 which will interface with the utility pole 4 when mounted thereon.
The groove 5 is shaped and dimensioned to conform generally with the portion of the surface of the pole to be received by the groove. Passing from the front of the vertical stem 2 to the semicircular groove 5, are two or more horizontally disposed bolt passages 6, for fastening the crossarm assembly to the pole 4. The crossarms 3 are fabricated as an integral unit of the vertical stem 2.
The upper portion of the stem 2 has conductor supporting grooves 7. Conductor gripping ridges 8 may be formed into the conductor supporting grooves 7. The conductor (not shown) is held in place by means of a J bolt 9. The long arm of the J bolt 9 extends through bolt hole 16 into the body of the stem 2 and the threaded section of the bolt 9 is fastened by means of washer 10, nut 11 and locking nut 12. The hole 15 receiving the short stem of the J bolt 9 may optionally extend through the body of stem 2, but should be of sufficient depth so as to allow the 2 ~
curved portion of the bolt to grip a conductor passing between it and the conductor supporting grooves 7.
Alternatively, the hole 15 may be used for the long arm of the J bolt and hole 16 for the short arm. C o n d u c t o r supporting grooves 7 are also located near the outside ends of the crossarms 3. These grooves may have gripping ridges 8 to better fix the conductor. On either side of conductor supporting grooves 7 are provided holes 15, 16 to receive the J bolts. The conductor is held in place by J bolts in the same manner as described above. Fibreglass armours are placed into the supporting grooves in order to improve the electrical insulation where the J bolt contacts the conductor. A fibreglass armour includes three quarters of the lateral surface of the conductor and is formed so as to be slipped over the conductor and arranged in the desired place.
Strain support wings 17 may be formed as separate units and inserted into appropriate receiving grooves (not shown) or may be formed as an integral part of the crossarm 3 and stem 2. The support wings 17 are triangular and are sheet like in shape and structure. Alternatively, the support wings 17 may be of triangular shape and formed of strips wherein the central portion of each wing has an opening to reduce wind drag. The crossarm 3 need not have the strain wings in every operable embodiment, but it is desirable to include them in the structure when the conductors are of heavier gauge, or when the next conductor support means is at an extended distance from the present one.
Figure 3 shows a perspective view for an embodiment where a mono-phase current transportation crossarm support is mounted on a utility pole. The crossarm structure is made of vertical stem 2 only. The stem is provided with the semicircular groove 5 (as in the embodiment of Figures 1 - 3) which will interface with the utility pole 4 when mounted thereon. The electrical 2~
conductors are supported in grooves 7 and fixed with J
bolts 9 and washer 10, nut 11 and locking nut 12.
In the embodiment of Figures 4 and 5 curvers 18 are moulded into the structure on crossarm 3 and stem 2.
The curvers 18 have a discoidal or saucer-like shape (see Figures 5a and 5b) and extend peripherally around the arms and stem. They are formed adjacent the conductor supporting grooves 7, for increasing the length of the surface leakage current path.
The curvers also assist in the shedding of water during rainfall, thereby accelerating the drying of the crossarm and stem and, in any event, reducing the amount ; of surface water thereon.
In a further embodiment, the conductor supporting grooves 7 may increase in diameter at their ends so as to facilitate the passage of conductors in the event the conductors approach the crossarm 3 or stem 2 at an angle.
It will be readily apparent to those skilled in the art that modifications and improvements may be made to the invention without departing from the essential scope of the invention taught herein.
Claims (13)
1. A transmission electrical insulator crossarm support for mounting on a utility pole comprising:
a crossarm structure, fabricated substantially of a nonconductive, corrosion resistant material and having a generally concave mounting surface which substantially adapts to at least a portion of the lateral surface of said utility pole;
securing means for mounting said crossarm structure on said utility pole; and attaching means for fastening electrical conductors to said crossarm structure;
wherein said crossarm structure is provided with supporting grooves, each accommodating an electrical conductor and wherein said attaching means are effective in securing the electrical conductor into said supporting grooves.
a crossarm structure, fabricated substantially of a nonconductive, corrosion resistant material and having a generally concave mounting surface which substantially adapts to at least a portion of the lateral surface of said utility pole;
securing means for mounting said crossarm structure on said utility pole; and attaching means for fastening electrical conductors to said crossarm structure;
wherein said crossarm structure is provided with supporting grooves, each accommodating an electrical conductor and wherein said attaching means are effective in securing the electrical conductor into said supporting grooves.
2. A crossarm support as claimed in claim 1 wherein the material from which said crossarm structure is fabricated is fibreglass.
3. The crossarm support as claimed in claim 1, wherein the crossarm structure comprises an elongated vertical stem having a modified rectangular cross-section at least a portion of one side of which is generally concave in shape, wherein supporting grooves for accommodating current conductors are provided on two opposed lateral sides of an upper end of said stem.
4. A crossarm support as claimed in claim 1, wherein the crossarm structure comprises:
an elongated vertical stem with a modified rectangular cross section at least a portion of one side of which is generally concave in shape, and supporting arms having a generally rectangular cross section extending horizontally and outwardly in opposite directions from said stem at the normally lower area thereof;
wherein supporting grooves are provided on opposite lateral sides of an upper end of said stem and a supporting groove is formed on the upper surface and in the proximity of the outside end of each of said horizontal supporting arms, for accommodating current conductors.
an elongated vertical stem with a modified rectangular cross section at least a portion of one side of which is generally concave in shape, and supporting arms having a generally rectangular cross section extending horizontally and outwardly in opposite directions from said stem at the normally lower area thereof;
wherein supporting grooves are provided on opposite lateral sides of an upper end of said stem and a supporting groove is formed on the upper surface and in the proximity of the outside end of each of said horizontal supporting arms, for accommodating current conductors.
5. A crossarm support as claimed in claim 3 or 4 wherein the radius of each of said conductor supporting grooves increases at both ends thereof.
6. A crossarm support as claimed in claim 1, 2, 3, or 4 wherein said securing means for mounting said crossarm structure comprises at least two bolts passing through said stem and threaded in said utility pole.
7. A crossarm support as claimed in claim 1, wherein said attaching means for fastening the electrical conductor comprises at least one J bolt having a threaded long arm, said long arm passing through the crossarm structure and fastened to said crossarm structure by means of a washer and securing nuts, and a J bolt short arm extending into the crossarm structure after passing over an electrical conductor arranged in the supporting groove.
8. A crossarm support as claimed in claim 1, wherein said attaching means further comprise gripping ridges formed in said supporting grooves to facilitate attachment between the electrical conductor and the supporting groove surface.
9. A crossarm support as claimed in claims 7 or 8 wherein a fibreglass armour includes three quarters of the lateral surface of the electrical conductor located into said supporting groove, wherein said fibreglass armour may be slipped on the electrical conductor and ensures a further electrical insulation between said J bolt and the electrical cable.
10. The crossarm support as claimed in claim 4, wherein at the intersection of the stem and supporting arms right-triangular strain reliefs of general sheet cross section are provided, said reliefs being fixed with the perpendicular sides to the stem and supporting arm.
11. The crossarm support as claimed in claim 10, wherein the triangular strain reliefs are manufactured of strips, providing a low wind drag profile.
12. A crossarm support as claimed in claim 1 or 2, said support being treated in a manner as to provide effective protection against fire and u.v. radiations.
13. A crossarm support as claimed in claim 3 or 4 wherein substantially saucer shaped curvers are moulded into said crossarm structure between and in the vicinity of said attaching means for fastening electrical conductors thereto and wherein said curvers extend transversally around said supporting arms and said vertical stem.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2051515 CA2051515A1 (en) | 1991-07-24 | 1991-07-24 | Transmission wire supporting crossarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2051515 CA2051515A1 (en) | 1991-07-24 | 1991-07-24 | Transmission wire supporting crossarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2051515A1 true CA2051515A1 (en) | 1993-01-25 |
Family
ID=4148378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2051515 Abandoned CA2051515A1 (en) | 1991-07-24 | 1991-07-24 | Transmission wire supporting crossarm |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2051515A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001023691A1 (en) * | 1999-09-28 | 2001-04-05 | Electrical Moulded Components Pacific Pty. Ltd. | Cross arm formed of insulator |
| AU771648B2 (en) * | 1999-09-28 | 2004-04-01 | Wamco Pacific Pty. Ltd. | Cross arm formed of insulator |
-
1991
- 1991-07-24 CA CA 2051515 patent/CA2051515A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001023691A1 (en) * | 1999-09-28 | 2001-04-05 | Electrical Moulded Components Pacific Pty. Ltd. | Cross arm formed of insulator |
| AU771648B2 (en) * | 1999-09-28 | 2004-04-01 | Wamco Pacific Pty. Ltd. | Cross arm formed of insulator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |