Claims
- 1. A method of assembling a synthetic resin insulator, wherein a fiber reinforced plastic rod is inserted into a sleeve, which constitutes the whole or a part of a holding metal fitting, and the sleeve is compressed to secure frictionally the fiber reinforced plastic rod in the sleeve of the holding metal fitting, comprising inserting a fiber reinforced plastic rod having a substantially smooth cylindrical outer surface into a sleeve having a substantially smooth cylindrical inner surface, compressing the sleeve from at least five independent centripetal directions in substantially the same amount by means of a divided die, which has a pressing surface having a curvature extending substantially along the outer peripheral surface of the sleeve and moves in the centripetal direction, to reduce and deform uniformly and plastically the inner diameter of the sleeve only in the centripetal direction at the cross-section of the sleeve, which cross-section intersects perpendicularly the center axis of the sleeve and at the same time to reduce and deform uniformly the outer diameter of the fiber reinforced plastic rod within its elasticity only in the centripetal direction, resulting in a uniform frictional force between the inner circumference of the sleeve and the outer circumference of the fiber reinforced plastic rod and a substantially smooth cylindrical interface between the plastically deformed sleeve and the elastically deformed fiber reinforced plastic rod, wherein the difference between the maximum value and the minimum value of compressed amounts of the elastically deformed fiber reinforced plastic rod is less than 1.25%.
- 2. The method of claim 1, wherein the maximum value of the compressed amount of the elastically deformed fiber reinforced plastic rod corresponds to a face of the plastically deformed sleeve and the minimum value of the compressed amount of the elastically deformed fiber reinforced plastic rod corresponds to a corner of the plastically deformed sleeve.
- 3. The method of claim 2, wherein the difference between the maximum value and the minimum value of the compressed amounts of the elastically deformed fiber reinforced plastic rod is not greater than 0.5%.
- 4. The method of claim 1, wherein the difference between the maximum value and the minimum value of the compressed amounts of the elastically deformed fiber reinforced plastic rod is not greater than 0.5%.
- 5. A synthetic resin insulator comprising a fiber reinforced plastic rod and a holding metal fitting wholly or partly composed of a sleeve, said fiber reinforced plastic rod being firmly secured to the sleeve by the rod having been inserted into the sleeve with an inner surface of the sleeve contacted with an outer surface of the rod, and said sleeve having been compressed and deformed in its centripetal direction about said fiber reinforced plastic rod in substantially the same amount by a die means comprising at least five (5) pieces, said die means having a pressing surface extending along an outer periphery of the sleeve, so that the tensile and shear forces between individual fibers are substantially zero, and the frictional force is uniform between the outer circumference of the fiber reinforced plastic rod and the inner circumference of the sleeve.
- 6. A synthetic resin insulator comprising a fiber reinforced plastic rod and a holding metal fitting wholly or partly composed of a sleeve, said fiber reinforced plastic rod being firmly secured to the sleeve by the rod having been inserted into the sleeve with an inner surface of the sleeve contacted with an outer surface of the rod, and said sleeve having been compressed and deformed in its centripetal direction about said fiber reinforced plastic rod in substantially the same amount by a die means comprising at least five (5) pieces, said die means having a pressing surface extending along an outer periphery of the sleeve, the fiber reinforced plastic rod having been compressed in substantially the same amount in its centripetal direction by the inner surface of the sleeve such that the difference between the maximum compressed amount and the minimum compressed amount of the rod is less than 1.25% at a cross-section of the rod which intersects perpendicularly a center axis of the rod, resulting in tensile and shear forces between individual fibers being substantially zero, and the frictional force being uniform between the outer circumference of the fiber reinforced plastic rod and the inner circumference of the sleeve.
Priority Claims (1)
Number |
Date |
Country |
Kind |
53-22820 |
Mar 1978 |
JPX |
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CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 405,041 filed Aug. 4, 1982 (now abandoned), which in turn is a continuation of application Ser. No. 154,877 filed May 30, 1980 (now abandoned), which in turn is a continuation of application Ser. No. 014,162 filed Feb. 22, 1979 (now abandoned). In addition, this application is related to application Ser. No. 319,087 filed Nov. 6, 1981 (now abandoned), which is a division of application Ser. No. 154,877 filed May 30, 1980 (now abandoned), which in turn is a continuation of application Ser. No. 014,162 filed Feb. 22, 1979 (now abandoned).
US Referenced Citations (14)
Foreign Referenced Citations (4)
Number |
Date |
Country |
49-26479 |
Jul 1974 |
JPX |
808697 |
Feb 1959 |
GBX |
878073 |
Sep 1961 |
GBX |
910750 |
Nov 1962 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Re, Vittorio, "L'Isoflon, un isolatore in fibre di vetro-resina/PTFE per le reti di transmissione", Elettrificazione, No. 6 (Jun.), 1971, pp. 287-295. |
Continuations (2)
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Number |
Date |
Country |
Parent |
154877 |
May 1980 |
|
Parent |
14162 |
Feb 1979 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
405041 |
Aug 1982 |
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