AU713641B2 - Polymer insulator - Google Patents
Polymer insulator Download PDFInfo
- Publication number
- AU713641B2 AU713641B2 AU60557/96A AU6055796A AU713641B2 AU 713641 B2 AU713641 B2 AU 713641B2 AU 60557/96 A AU60557/96 A AU 60557/96A AU 6055796 A AU6055796 A AU 6055796A AU 713641 B2 AU713641 B2 AU 713641B2
- Authority
- AU
- Australia
- Prior art keywords
- resin
- polymer
- insulator
- strand
- bushings
- 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.)
- Ceased
Links
- 239000012212 insulator Substances 0.000 title claims description 156
- 229920000642 polymer Polymers 0.000 title claims description 95
- 229920005989 resin Polymers 0.000 claims description 73
- 239000011347 resin Substances 0.000 claims description 73
- 239000000835 fiber Substances 0.000 claims description 61
- 230000002787 reinforcement Effects 0.000 claims description 49
- 229920003051 synthetic elastomer Polymers 0.000 claims description 17
- 239000005061 synthetic rubber Substances 0.000 claims description 17
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 239000012774 insulation material Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000005452 bending Methods 0.000 description 12
- 230000004048 modification Effects 0.000 description 10
- 238000012986 modification Methods 0.000 description 10
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 6
- 239000011151 fibre-reinforced plastic Substances 0.000 description 6
- 239000003365 glass fiber Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 229920006305 unsaturated polyester Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Insulators (AREA)
Description
S F Ref: 345948
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATIO FOR A STANDARD
PATENT
ORIGINAL
S..
Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: NGK Insulators, Ltd.
2-56, Suda-cho, Mizuho-ku Nagoya-shi Aichi-ken 467
JAPAN
Junichi Matsumoto, Akishiro Tamai and Koichi Ishida Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Polymer Insulator The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 '4
S
The present invention relates to an insulator adapted for use in electric power distribution lines, and more particularly to a polymer insulator provided with a fiber reinforced plastic insulator body.
In general, an insulator provided with a fiber reinforced plastic insulator body is Swell known as a polymer insulator or plastic insulator. Disclosed in U.S. Patent No.
5,406,033 is a composite insulator of the type which includes a fiber reinforced plastic insulator body formed by winding a strand of resin-coated glass fibers in a prescribed manner longitudinally between and around a pair of spool-shaped bushings or fittings retained in relative positions spaced in a predetermined distance and a polymer such as I silicone rubber molded over the fiber reinforced plastic insulator body. A lightweight polymer insulator of this kind is advantageous in handling such as transportation, installation and the like since it has a high tensile strength and a high resistance to impact in comparison with a ceramic insulator. In use of the polymer insulator, it is, however, required to provide the polymer insulator in a predetermined length for resistance to a 15 rated voltage. The length of the polymer insulator is, therefore, increased in application of a high rated voltage. As a result, the buckling strength and bending strength of the polymer insulator are decreased in accordance with an increase of the length.
The polymer insulator is usually applied with a compression load caused by rolling of electric power distribution lines. If the compression load is applied in excess over the 20 buckling strength of the polymer insulator, there will occur buckling destruction in the polymer insulator and separation between the insulator body and the molded polymer, resulting in deterioration of the insulation property.
In the polymer insulator described above, a second layer of resin-coated glass fibers is wound transversely around the insulator body to enhance resistance against the compression load. The manufacturing process of the insulator body is, however, complicated.
It is, therefore, a primary object of the present invention to provide a polymer insulator capable of enhancing resistance against the compression load in a simple construction.
30 According to one aspect of the present invention, there is provided a polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield Slayer of synthetic rubber molded over the strand of resin-coated fiber, wherein a Cs [R:\I,IBFF]0844O.doc:SSD 2 longitudinal reinforcement member is attached to at least one face of the insulator body and embedded in the shield layer between the bushings.
Preferably, the reinforcement member is in the form of a longitudinal reinforcement plate member of hard synthetic resin attached along the insulator body and engaged at opposite ends thereof with the bushings. Alternatively, the reinforcement member may be in the form of a reinforcement rod disposed in a longitudinal internal cavity of the strand of resin-coated fibers and engaged at opposite ends thereof with each annular groove of the spool-shaped bushings.
According to another aspect of the present invention, there is provided a polymer t0 insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein a pair of reinforcement plate members are attached to opposite faces of the insulator body and embedded in the shield layer between the bushings. Preferably, the reinforcement plate S. members are connected to each other at an intermediate portion of the insulator body.
According to another aspect of the present invention, there is provided a polymer g p insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield p...pp o. layer of synthetic rubber molded over the strand of resin-coated fibers, wherein the strand of resin-coated fibers is crossed between the bushings. In the polymer insulator, the °strand of resin-coated fibers may be crossed multiple times between the bushings through a plurality of equally spaced spacers of insulation material.
p 2 According to yet another aspect of the present invention, there is provided a polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein said strand of resin-coated fibers is crossed multiple times between said bushings through a plurality of equally spaced spacers of insulation material.
rR:\l[IBFF]08440doc:SSD 2a According to a further aspect of the present invention, there is provided a polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein the strand of resin-coated fibers is twisted at least once between the bushings. In the polymer insulator, the strand of resin-coated fibers may be replaced with first and second strands of resin-coated fibers concentrically wound between and around the pair of spaced spoolshaped bushings and twisted relatively in an opposite direction at a portion between the 0 bushings. Alternatively, the strand of resin-coated fibers in the polymer insulator may be replaced with first and second strands of resin-coated fibers wound longitudinally in parallel between the pair of spaced bushings and twisted relatively in an opposite direction at a portion between the bushings respectively.
According to another aspect of the invention, there is provided a polymer insulator 5 including an insulator body comprised of first and second strands of resin-coated fibers concentrically wound between and around a pair of spool-shaped bushings spaced in a 9predetermined distance and twisted relatively in an opposite direction at a portion between said bushings, the strands of fibers being hardened by cure of the coated resin, and a polymer shield layer of synthetic rubber molded over the strands of resin-coated fibers.
99..
According to yet another aspect of the invention, there is provided a polymer •insulator including an insulator body comprised of first and second strands of resin-coated fibers wound longitudinally in parallel between a pair of spool-shaped bushings spaced in a predetermined distance and twisted relatively in an opposite direction at a portion S. 25 between said bushings respectively, the strands of fibers being hardened by cure of the coated resin, and a polymer shield layer of synthetic rubber molded over the strands of resin-coated fibers.
[R:\LIBFF]08440.doc:SSD For better understanding of the present invention, and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: Fig. 1 is an elevational view, partially in section, of a polymer insulator in accordance with the present invention; Fig. 2 is a cross-sectional view of the polymer insulator shown in Fig. 1; Fig. 3 is an elevational view, partially in section, of a modification of the polymer insulator shown in Fig. 1; Fig. 4 is a cross-sectional view of the modified polymer insulator shown in Fig.
3; Fig. 5 is an elevational view, partially in section, of another modification of the polymer insulator shown in Fig. 1 Fig. 6 is an elevational view, partially in section, of a further modification of the polymer insulator shown in Fig. 1; Fig. 7 is an elevational view of a modification of an insulator body shown in Fig.
1; Fig. 8 is an elevational view of another modification of the insulator body shown in Fig. 1; Fig. 9 is a partially broken elevational view of a further modification of the insulator body shown in Fig. 1; Fig. 10 is an elevational view of a still another modification of the insulator body shown in Fig. 1; Fig. 11 is a plan view of the insulator body shown in Fig. Fig. 12 is a graph showing the tensile strength of the polymer insulator in relation to the thickness and width of the insulator body; and Fig. 13 is a vertical sectional view of a bushing embedded in the insulator body.
Illustrated in Figs. 1 and 2 of the drawings is an embodiment of a polymer insulator according to the present invention. The polymer insulator includes a fiber reinforced plastic insulator body 10a comprised of a continuous strand 12 of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings 11, 11 spaced in a predetermined distance and a polymer shield layer 13 molded in one piece over the insulator body 10a through a pair of reinforcement members 14.
The bushings 11 of insulator body 10a each are in the form of a spool-shaped metallic member which has a cylindrical portion 1 la formed with a pair of spaced outward annular flanges lb and an annular groove l lc between the annular flanges l lb. During a manufacturing process of the fiber reinforced plastic insulator body 10a, the spool-shaped I [N:\LIBC]01338:MER bushings 11 are retained in the relative positions spaced in a predetermined distance. On the other hand, a continuous strand 12 of fibers such as mono-filaments or multi-filaments of glass fibers, synthetic fibers or spinning threads of various kinds of fibers is coated with liquid synthetic resin such as epoxy, unsaturated polyester or other material, and then wound longitudinally between and around the bushings 11 along their annular grooves 1ic. After the strand is wound around the bushings 11 to form the insulator body 10a, the liquid resin is allowed to hard cure. This secures the bushings 11 in the opposite ends of the insulator body 10a, respectively. The reinforcement members 14 are attached to opposite faces of the insulator body O10a and covered with the polymer shield layer 13.
The reinforcement members 14 each are in the form of a longitudinal plate member 14a which is made of hard synthetic resin and formed slightly smaller in width than the insulator body 10a. The reinforcement plate member 14a is formed at its opposite ends with a pair of circular mounting holes 14b for engagement with the cylindrical portion Ila of the respective bushings 11. The reinforcement plate members 14 are mounted to the bushings 11 in such a manner that the mounting holes 14b are coupled with opposite ends of the cylindrical portion 1 la. In such a condition, the reinforcement plate members 14 are connected to each other at their intermediate portions by means of a connecting pin 14c.
*o.
*The polymer shield layer 13 is made of an elastic polymer material such as silicone rubber or ethylene-propylene rubber. The shield layer 13 has a cylindrical portion 13a :formed in an oval cross-section to cover the entirety of the insulator body 10a and a plurality of weathersheds 13b radially outwardly protruded from the cylindrical portion 13a. During the manufacturing process of the polymer insulator, the shield layer 13 is molded in one piece over the insulator body 10a in a condition where the reinforcement plater members 14 attached to the insulator body 10a are placed in a molding die (not shown). During the molding process, the synthetic rubber forming the shield layer 13 30 impregnates into the strand 12 of insulator body 10a through the reinforcement plate members 14. Thus, a longitudinal internal cavity of the strand 12 is filled with an insert 13c of synthetic rubber.
In the polymer insulator described above, the insulator body 10a and reinforcement plate members 14 are useful to increase the tensile strength of the polymer insulator and to increase resistance of the polymer insulator against impact applied thereto. In particular, the reinforcement plate members 14 are useful to increase the buckling strength and bending strength of the insulator body 10a thereby to enhance the entire strength of the polymer insulator. As a result, in the case that the polymer insulator is provided in a long length, the insulator is able to sufficiently resist against a compression load and a bending [N:\LIBC]01338:MER load applied thereto in excess. In the case that a reinforcement member of different stiffness is used as the reinforcement member 14 in accordance with the length of the polymer insulator, the buckling strength and bending strength of the insulator can be obtained in desired values. In a practical embodiment of the polymer insulator, the reinforcement plate members 14 may be formed with through holes at appropriate positions to allow the synthetic rubber impregnated therethrough thereby to firmly secure the polymer shield layer 13 to the reinforcement plate members 14.
Illustrated in Figs. 3 and 4 is a modification of the polymer insulator, wherein the reinforcement plate members 14 are replaced with a solid reinforcement rod 15 of circular cross-section the length of which is approximately the same as the distance between the bushings 11. The reinforcement rod 15 is formed at its opposite ends with a pair of proJections 15b for engagement with the annular grooves l lc of the bushings 11. The reinforcement rod 15 is embedded in the strand 12 of insulator body 10a between the bushings 11 in a condition where the projections 15b of reinforcement rod 15 have been coupled with the annular grooves 1 Ic of bushings 11. In the modified polymer insulator, the reinforcement rod 15 embedded in the insulator body 10a is useful to increase the buckling strength and bending strength of the polymer insulator. Thus, the modified polymer insulator is able to resist against a compression load and a bending load applied 20 thereto in excess as in the polymer insulator shown in Figs. 1 and 2. °S.
oS Illustrated in Fig. 5 is a modification of the polymer insulator shown in Fig. 3 and 4, wherein the reinforcement rod 15 is replaced with a solid reinforcement rod 16 of square cross-section the length of which is the same as the distance between the bushings 11.
The reinforcement rod 16 is formed at its opposite ends with a pair of projections 16b for engagement with the annular grooves li c of bushings 11 and at its intermediate portion with a support projection 16c. The reinforcement rod 16 is embedded in a longitudinal internal cavity of the strand 12 between the bushings 11 in a condition where the proJections 16b have been engaged with the annular grooves l ic of bushings 11 and where the strand 12 of insulator body 10a has been coupled within a channel 16cl in the support proJection 16c. Thus, the reinforcement rod 16 embedded in the insulator body is useful to increase the buckling strength and bending strength of the polymer insulator. Since the strand 12 of insulator body 10a is supported by the intermediate support projection 16c of reinforcement rod 16, the polymer insulator is able to resist against a larger compression load than that in the polymer insulator shown in Figs. 3 and 4.
Illustrated in Fig. 6 is another modification of the polymer insulator shown in Figs. 3 and 4, wherein the reinforcement rod 15 is replaced with a solid reinforcement rod 17 of square cross-section the length of which is the same as the distance between the bushings [N:\LIBC]01338:MER 6 The reinforcement rod 17 is formed at its opposite ends with a pair of semi-circular recesses 17b for engagement with the annular grooves 1l c of bushings 11. The reinforcement rod 17 is embedded in a longitudinal internal cavity of the strand 12 of insulator body O10a between the bushings 11 in a condition where the semi-circular recesses 17b of rod 17 have been engaged with the annular grooves 1 c of bushings 11.
Thus, the reinforcement rod 17 embedded in the insulator body O10a is useful to increase the buckling strength and bending strength of the polymer insulator.- Since the reinforcement rod 17 is engaged with the annular grooves I c of bushings I 1 at its semicircular recesses 17b, the insulator body 10a is connected to the bushings 11 more firmly I than that in the polymer insulator shown in Figs. 3 and 4.
In a practical embodiment of the present invention, the strand 12 of resin-coated fibers may be replaced with a strand 12 of resin-coated fibers crossed between the bushings 11 as shown in Figs. 7 and 8 without the provision of the reinforcement member 14, 15, 16 or 17. Alternatively, the stand 12 of resin-coated fibers may be replaced with S I5 strands 12d and 12e of resin-coated fibers as shown in Figs. 9 to 11 without the provision of the reinforcement member 14, 15, 16 or 17. In an insulator body 10b shown in Fig. 7, :a athe strand 12 of resin-coated fibers is crossed at the central portion of the insulator body 10b when it is wound multiple times between and around the bushings 11. In a polymer insulator provided with the insulator body O10b, the crossed strand 12 of resin-coated fibers is useful to enhance the buckling strength and bending strength of the polymer insulator other than the tensile strength in a longitudinal direction. In an insulator body O10c shown So° in Fig. 8, the strand 12 of resin-coated fibers is crossed at four positions by means of aequally spaced rod-like spacers 12a, 12b, 12c when it is wound multiple times between and around the bushings 11. The spacers 12a, 12b and 12c each are made of an insulation material and formed at their opposite ends with a pair of spaced annular flanges which "retain the strand of resin-coated fibers in the crossed condition. In a polymer insulator provided with the insulator body O10c, the crossed strand 12 of resin-coated fibers is useful to enhance the buckling strength and bending strength of the polymer insulator.
In an insulator body 10d shown in Fig. 9, first and second strands 12d and 12e of resin-coated fibers are concentrically wound between and around the bushings 11 and twisted relatively in an opposite direction at a portion between the bushings 11. In a [R:\LIBFFJ08440.doc:SSD 1 7 polymer insulator provided with the insulator body Od, the iulor body d, the insulator body 10d is useful to enhance the buckling strength and bending strength of the polymer insulator. In an insulator body 10e shown in Figs. 10 and 11, first and second strands 12f and 12g of resincoated fibers are wound longitudinally in parallel between and around the corresponding bushings 11 and twisted once between the bushings 11 relatively in an opposite direction.
In a polymer insulator provided with the insulator body 10e, the crossed strands 12f and 1 2 g of resin-coated fibers are useful to enhance the buckling strength and bending strength of the polymer insulator.
In Fig. 12, there is illustrated the tensile strength of the polymer insulator in relation I0 to the thickness t and width w of the insulator body shown in Fig. 13. With reference to the graph of Fig. 12, it has been found that the tensile strength (kg/mm2) of the insulator body against destruction stress decreases in accordance with an increase of the thickness t. It is, therefore, preferable that the insulator body is formed in a trapezoid cross-section as shown in Fig. 13 to effectively utilize the strand of resin-coated fibers. With such a construction of the insulator body, the impregnation density of liquid resin is stabilized to enhance the mechanical strength of the polymer insulator.
o *4*9 9 9*• 9 9* 9 S* 9* [R:\IIBFF]08440.doc:SSD
Claims (9)
1. A polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein a longitudinal reinforcement member is attached to at least one face of said insulator body and embedded inside the shield layer between said bushings.
2. A polymer insulator as claimed in Claim 1, wherein said reinforcement member is in the form of a longitudinal reinforcement plate member of hard synthetic lI resin attached along said insulator body and engaged at opposite ends thereof with said bushings.
3. A polymer insulator as claimed in Claim 2, wherein said reinforcement plate member is coupled at opposite ends thereof with each cylindrical portion of said spool- shaped bushings. o o s15
4. A polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein a pair of reinforcement plate members are attached to opposite faces of said 20 insulator body and embedded inside said shield layer between said bushings. A polymer insulator as claimed in Claim 4, wherein said reinforcement plate members are connected to each other at an intermediate portion of said insulator body. S6. A polymer insulator as claimed in Claim 1, wherein said reinforcement nmember is in the form of a solid reinforcement rod disposed in a longitudinal internal V. "cavity of said strand of resin-coated fibers and engaged at opposite ends thereof with each oei annular groove of said spool-shaped bushings.
7. A polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein said strand of resin-coated fibers is crossed between said bushings. 7/ [R:\LIBFF]08440.doc:SSD 9
8. A polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein said strand of resin-coated fibers is crossed multiple times between said bushings through a plurality of equally spaced spacers of insulation material.
9. A polymer insulator including an insulator body comprised of a strand of resin-coated fibers wound longitudinally between and around a pair of spool-shaped bushings spaced in a predetermined distance and hardened by cure of the coated resin 0 and a polymer shield layer of synthetic rubber molded over the strand of resin-coated fibers, wherein said strand of resin-coated fibers is twisted at least once between said bushings. A polymer insulator including an insulator body comprised of first and second strands of resin-coated fibers concentrically wound between and around a pair of a. I5 spool-shaped bushings spaced in a predetermined distance and twisted relatively in an opposite direction at a portion between said bushings, the strands of fibers being hardened by cure of the coated resin, and a polymer shield layer of synthetic rubber molded over the strands of resin-coated fibers. O•Q°
11. A polymer insulator including an insulator body comprised of first and 2o second strands of resin-coated fibers wound longitudinally in parallel between a pair of spool-shaped bushings spaced in a predetermined distance and twisted relatively in an opposite direction at a portion between said bushings respectively, the strands of fibers being hardened by cure of the coated resin, and a polymer shield layer of synthetic rubber molded over the strands of resin-coated fibers. S° 25
12. A polymer insulator, substantially as hereinbefore described with reference to the accompanying drawings. Dated 24 September, 1999 NGK Insulators Ltd. Patent Attorneys for the Applicant/Nominated Person SPRUSON FERGUSON [R:\LIBFFIO8440.doc:SSD i
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18193095A JP3400895B2 (en) | 1995-07-18 | 1995-07-18 | Insulator with reinforced plastic core |
| JP7-181930 | 1995-07-18 | ||
| JP8-66466 | 1996-03-22 | ||
| JP06646696A JP3557305B2 (en) | 1996-03-22 | 1996-03-22 | Insulator with reinforced plastic core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6055796A AU6055796A (en) | 1997-01-23 |
| AU713641B2 true AU713641B2 (en) | 1999-12-09 |
Family
ID=26407657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU60557/96A Ceased AU713641B2 (en) | 1995-07-18 | 1996-07-17 | Polymer insulator |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU713641B2 (en) |
| ID (1) | ID16309A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373113A (en) * | 1979-09-15 | 1983-02-08 | Instytut Elektrotechniki Oddzial Technologii I Materialoznawstwa Elektrotechnicznego | High-voltage polymeric insulator with sheath of elastic and rigid segments and method of making same |
| US4427843A (en) * | 1980-11-20 | 1984-01-24 | Ngk Insulators Ltd. | Rod insulator with elastic overcoats and conducting paths straddling joint portions of adjacent overcoats |
-
1996
- 1996-07-17 AU AU60557/96A patent/AU713641B2/en not_active Ceased
- 1996-07-18 ID IDP962050A patent/ID16309A/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4373113A (en) * | 1979-09-15 | 1983-02-08 | Instytut Elektrotechniki Oddzial Technologii I Materialoznawstwa Elektrotechnicznego | High-voltage polymeric insulator with sheath of elastic and rigid segments and method of making same |
| US4427843A (en) * | 1980-11-20 | 1984-01-24 | Ngk Insulators Ltd. | Rod insulator with elastic overcoats and conducting paths straddling joint portions of adjacent overcoats |
Also Published As
| Publication number | Publication date |
|---|---|
| ID16309A (en) | 1997-09-18 |
| AU6055796A (en) | 1997-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5727357A (en) | Composite reinforcement | |
| US4312162A (en) | Reinforced pole | |
| CA1238205A (en) | Structural rod for reinforcing concrete material | |
| RU2119689C1 (en) | Insulator and method for its manufacturing | |
| US3574104A (en) | Glass fiber constructional member | |
| US5692351A (en) | Column support system with neck piece for supporting overhead loads | |
| US4422286A (en) | Fiber reinforced plastic impregnated wire rope | |
| US5555696A (en) | Filament wound architectural column | |
| RU2151226C1 (en) | Wire cable for reinforcing rubber articles | |
| US3709754A (en) | Method of forming a construction member of glass fiber elements | |
| JPH0314623B2 (en) | ||
| US6048598A (en) | Composite reinforcing member | |
| KR900010144A (en) | FRP smelting structure and its manufacturing method | |
| US11555310B2 (en) | Composite rebar | |
| EP0149336A2 (en) | Flexible tension members | |
| AU713641B2 (en) | Polymer insulator | |
| EP1801819B1 (en) | A method for manufacturing a post insulator and a post insulator | |
| GB2189002A (en) | Stiffening of hollow structures | |
| KR102554723B1 (en) | CFRP bar to prevent deterioration of rib attachment ability and method thereof | |
| RU2118005C1 (en) | Electric insulator and its manufacturing process | |
| KR101095001B1 (en) | Concrete reinforcing bars made of fiber-reinforced composite | |
| KR860002121A (en) | How to manufacture coils embedded in casting resin | |
| IT8367885A1 (en) | SAFETY FENCING WEAPON | |
| JP3400895B2 (en) | Insulator with reinforced plastic core | |
| JP3462923B2 (en) | Terminal fixing method of multilayer fiber composite cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGA | Letters patent sealed or granted (standard patent) |