US3814838A - Insulator assembly having load distribution support - Google Patents
Insulator assembly having load distribution support Download PDFInfo
- Publication number
- US3814838A US3814838A US00365930A US36593073A US3814838A US 3814838 A US3814838 A US 3814838A US 00365930 A US00365930 A US 00365930A US 36593073 A US36593073 A US 36593073A US 3814838 A US3814838 A US 3814838A
- Authority
- US
- United States
- Prior art keywords
- insulators
- insulator assembly
- ring
- plate
- adapter plate
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/14—Supporting insulators
Definitions
- a ceramic insulator assembly includes a plurality of parallelvertical insulators arranged with equal spacings about the circumference of a circle.
- Vertical loadingforces are applied to the insulators by way of an adapter plate separated from a top plate on the insulat'ors by a load distribution ring.
- the ring is aligned with the axes of the insulators, so that bending forces are nottransferred to the insulators.
- a plurality of. vertical tiers of insulators separated by divider plates may be provided. One end of each insulator may be mounted in a molded joint to insure substantially equal load distribution.
- a ceramic insulator assembly that can withstand high loading forces without failure.
- the assembly is comprised of one or more tiers of parallel ceramic insulators positioned to. be equally spaced about the circumference of a circle, i.e. to be uniformly distributed about the circle.
- the axes of corresponding insulators in the tiers are aligned, and the tiers are separated by divider plates.
- a mounting plate is mounted to the tops of the insulators of the uppermost tiers, and a load distribution ring is mountedon top of the top mounting plate.
- the ring is aligned with the axes of the insulators, i.e., the center lines of the insulators extend through the load distribution r'ing between the inner and outer diameters thereof.
- An adapter plate is mounted on top of the distribution ring.
- the ring has a width, i.e. the dimensions between its inner and outer diameters, whereby bending due to loading of the assembly is taken up by the adapter plate, and 'is' not transferred to the top mounting plate and hence the ceramic insulators.
- a molded joint for example of an epoxy, is provided at one end of each insulator.
- FIG. I is a side view of a multi-tier insulator in accordance with the invention.
- FIG. 3 is a further enlarged, partially cross-sectional view of a portion of the insulator assembly of FIG. 2 taken along the lines 3--3;
- FIG. 1 is a side view of an insulator assembly in accordance with the invention.
- the assembly is comprised of one or more tiers of parallel, vertically extending, preferably cylindrical cetively shortened and shortens the effect of construction 2 ramic insulators 10, two such tiers being illustrated-in the arrangement of FIG. 1. It is to be understood, of course, that a greater or lesser number of tiers may be provided.
- the ends of each insulator are provided with mounting flanges 'l 1- according to conventional practice.
- the insulators 10 are equally spaced about the circumference of a circle, as is apparent in FIG. 2, and as shown in FIG. 1 the axes of corresponding insulators in the tiers are aligned. I
- tiers of insulators When two or more tiers of insulators are provided, they are separated by a center plate 12.
- the bottoms of the insulators of the lowermost tier are mounted on i a base plate 13, and a top plate 14 is mounted on the tops of the insulators of the uppermost tier.
- the insulator flanges 11 are affixed to the respective plates 12, 13
- the base plate 13 may be conventionally mounted on a spacer plate 15.
- FIG. 1 illustrates the application of a vertical load to the insulator assembly by the arrow P directed downwardly onto the adapter plate 20.
- the plates 12, 13 and 14 are preferably circular, as illustrated in FIG. 2. These plates may, if desired, be annular,.with the chain line 22 illustrating their inner edges, since the effective region of these plates from the standpoint of loading is annular.
- the insulators 10 shown in the drawing are depicted with smooth external surfaces, itwill be understood, of course, that these insulators may be provided with annular ridges according to the conventional practice. Further, as illustrated in FIG. I, the diameters of the ceramic insulators are greater at their ends than at their middle portions. While this feature is not essential, it is desirable since the highest. bending stresses on theassembly occur at the ends, not at the axial centers rangement have equal flexibility with respect to the top and base plates 14 and 13 respectively. In this arrangement the column length of the insulators is'thus effececcentricity.
- the load distribution ring 21 is provided in order that all bending from the vertical load'P within the circle of the ceramic insulators is taken in the adapter plate 20, and is thereby not transferred unevenly to the ceramic insulators.
- the width (i.e. the dimension between the inner and outer 1 diameters) of the ring 21 be as small as possible.
- minimum width is limited, according to conventional design practice, by the compressive strength of the material of the ring and the material in the top plate 14 and the adapter plate 20.
- the ring is aligned with the axes of the ceramic insulators, so that approximately equal areas of the tops of the ceramic insulators appear on the inside and Outside of the ring 21, as is apparent in FIG. 2.
- a molded joint 25 (see P16. 3) is provided at each insulator.'Themolded joints are provided at only one end of each insulator. The joint material must have high compressive strength, and as high as possible a modulus of elasticity, and it must also have low creep characteristics. Epoxy resin materials have been found to be suitable for this purpose.
- the maximum thicknessof the joint 25 is ascertained by adding together all of the construction tolerances in the fabrication of the insulators and insuring that the total vertical deflection of the molded joint is less than 10 percent of the total vertical deflection of the ceramic insulator under maximum load.
- the molded joint is employed so that all of the insulators acting in parallel, start their load cycles simultaneously upon the application of load to the assembly, whereby no stress concentrations are created.
- ceramic insulators were employed having lengths of 46.25
- the insulators were of normall station post design. The. heights of the flanges were 4 125 inches.
- the top plate 14, divider plate 12 and base plate 13 were 5 inches thick and had diameters of 55.25 inches.
- the effective inner edge 22 of these plates had a diameter of 19 inches.
- the diameter of the assembly between axes of opposite insulators was 37.2 inches.
- the load distributing ring 21 had an inner diameter'of 35.7 inches,'and outer diameter of 38.7, inches, and a'thickness of'0.25 inches.
- the adapter ring had a thickness of 12 inches.
- the molded joints 25 were of an epoxy material, and had maximumthieknesses of about 0.016 inches.
- the total deflection of the epoxy under the above load was thus less than 1 percent of the total vertical deflection.
- An insulator assembly comprising a plurality of parallel cylindrical insulators equally spaced about the circumference of a circle, mounting plate means mounted on one end of said insulators, an adapter plate means aligned with said mounting plate means for receiving a loading force, and a load distribution ring between said mounting plate and said adapter plate for transmitting said loading force to said insulators, said ring being aligned with the axes of said insulators, said ring having a width dimension between its inner and outer diameters that is less than the diameters of said insulators at said one end thereof whereby bending due to said loading force is not transferred to said insulators.
- An insulator assembly comprising a plurality of parallel vertical elongated ceramic insulators equally spaced about the circumference of a circle, a top plate means on the upper ends of said insulators, an adapter plate overlying said top plate means, and a load distribution ring between said adapter plate and said top plate and alignedwith the axes of said insulators, said ring having a width dimension between the inner and outer diameters thereof that is less than the diameters of the upper ends of said insulators whereby bending forces due to vertical loads applied tosaid adapter plate means are not transferred to said insulators.
- the insulator assembly of claim 2 further comprising a molded mounting joint on one end of each of said insulators whereby said vertical loads are substantially equally distributed between said insulators.
- An insulator assembly comprising a plurality of aligned tiers of parallel vertical cylindrical insulators equally spaced about the circumference of a circle with the axes of the insulators in separate tiers being aligned, divider plate means separating said tiers, a top plate mounted on the upper ends of the uppermost tier of insulators, an adapter plate above said top plate, and a load distribution ring between said adapter plate and said top plate and aligned with the axes of said insulators for transferring vertical loads on said adapter plate to said tiers of insulators, said ring having a width dimension between its inner and outer diameters that is less than the diameters of the upper ends of said insulators whereby bending due to said vertical load is not transferred from said adapter plate to said top plate.
- the insulator assembly of claim 8 further comprising a base plate mounted on the bottoms of the insulators of the lowermost tier of insulators, said top plate, divider plate means and base plate having substantially equal flexibility.
Landscapes
- Insulating Bodies (AREA)
- Insulators (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00365930A US3814838A (en) | 1973-06-01 | 1973-06-01 | Insulator assembly having load distribution support |
DE2406106A DE2406106C3 (de) | 1973-06-01 | 1974-02-05 | Stützisolatoranordnung |
FR7405584A FR2232047B1 (fr) | 1973-06-01 | 1974-02-19 | |
JP2409274A JPS5479B2 (fr) | 1973-06-01 | 1974-02-28 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00365930A US3814838A (en) | 1973-06-01 | 1973-06-01 | Insulator assembly having load distribution support |
Publications (1)
Publication Number | Publication Date |
---|---|
US3814838A true US3814838A (en) | 1974-06-04 |
Family
ID=23440979
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00365930A Expired - Lifetime US3814838A (en) | 1973-06-01 | 1973-06-01 | Insulator assembly having load distribution support |
Country Status (4)
Country | Link |
---|---|
US (1) | US3814838A (fr) |
JP (1) | JPS5479B2 (fr) |
DE (1) | DE2406106C3 (fr) |
FR (1) | FR2232047B1 (fr) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040135133A1 (en) * | 2002-12-27 | 2004-07-15 | Ngk Insulators, Ltd. | Polymer insulator apparatus and method of mounting same |
US20070273387A1 (en) * | 2001-08-31 | 2007-11-29 | Cascade Microtech, Inc. | Optical testing device |
US20070290700A1 (en) * | 1992-06-11 | 2007-12-20 | Cascade Microtech, Inc. | Wafer probe station having a skirting component |
US20080042374A1 (en) * | 2000-09-05 | 2008-02-21 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US20080042680A1 (en) * | 1999-06-30 | 2008-02-21 | Cascade Microtech Inc. | Probe station thermal chuck with shielding for capacitive current |
US7492172B2 (en) | 2003-05-23 | 2009-02-17 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US7498828B2 (en) | 2002-11-25 | 2009-03-03 | Cascade Microtech, Inc. | Probe station with low inductance path |
US7504823B2 (en) | 2004-06-07 | 2009-03-17 | Cascade Microtech, Inc. | Thermal optical chuck |
US7550984B2 (en) | 2002-11-08 | 2009-06-23 | Cascade Microtech, Inc. | Probe station with low noise characteristics |
US7595632B2 (en) | 1992-06-11 | 2009-09-29 | Cascade Microtech, Inc. | Wafer probe station having environment control enclosure |
US7626379B2 (en) | 1997-06-06 | 2009-12-01 | Cascade Microtech, Inc. | Probe station having multiple enclosures |
US7639003B2 (en) | 2002-12-13 | 2009-12-29 | Cascade Microtech, Inc. | Guarded tub enclosure |
US7688062B2 (en) | 2000-09-05 | 2010-03-30 | Cascade Microtech, Inc. | Probe station |
US7688091B2 (en) | 2003-12-24 | 2010-03-30 | Cascade Microtech, Inc. | Chuck with integrated wafer support |
US8069491B2 (en) | 2003-10-22 | 2011-11-29 | Cascade Microtech, Inc. | Probe testing structure |
US8319503B2 (en) | 2008-11-24 | 2012-11-27 | Cascade Microtech, Inc. | Test apparatus for measuring a characteristic of a device under test |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1998549A (en) * | 1934-02-15 | 1935-04-23 | Lapp Insulator Company Inc | Insulator construction |
US2264685A (en) * | 1940-06-28 | 1941-12-02 | Westinghouse Electric & Mfg Co | Insulating structure |
-
1973
- 1973-06-01 US US00365930A patent/US3814838A/en not_active Expired - Lifetime
-
1974
- 1974-02-05 DE DE2406106A patent/DE2406106C3/de not_active Expired
- 1974-02-19 FR FR7405584A patent/FR2232047B1/fr not_active Expired
- 1974-02-28 JP JP2409274A patent/JPS5479B2/ja not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1998549A (en) * | 1934-02-15 | 1935-04-23 | Lapp Insulator Company Inc | Insulator construction |
US2264685A (en) * | 1940-06-28 | 1941-12-02 | Westinghouse Electric & Mfg Co | Insulating structure |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7492147B2 (en) | 1992-06-11 | 2009-02-17 | Cascade Microtech, Inc. | Wafer probe station having a skirting component |
US20070290700A1 (en) * | 1992-06-11 | 2007-12-20 | Cascade Microtech, Inc. | Wafer probe station having a skirting component |
US7595632B2 (en) | 1992-06-11 | 2009-09-29 | Cascade Microtech, Inc. | Wafer probe station having environment control enclosure |
US7589518B2 (en) | 1992-06-11 | 2009-09-15 | Cascade Microtech, Inc. | Wafer probe station having a skirting component |
US7626379B2 (en) | 1997-06-06 | 2009-12-01 | Cascade Microtech, Inc. | Probe station having multiple enclosures |
US7616017B2 (en) | 1999-06-30 | 2009-11-10 | Cascade Microtech, Inc. | Probe station thermal chuck with shielding for capacitive current |
US20080042680A1 (en) * | 1999-06-30 | 2008-02-21 | Cascade Microtech Inc. | Probe station thermal chuck with shielding for capacitive current |
US7514915B2 (en) * | 2000-09-05 | 2009-04-07 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US20080048648A1 (en) * | 2000-09-05 | 2008-02-28 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US20080054885A1 (en) * | 2000-09-05 | 2008-03-06 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US20080048647A1 (en) * | 2000-09-05 | 2008-02-28 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US7688062B2 (en) | 2000-09-05 | 2010-03-30 | Cascade Microtech, Inc. | Probe station |
US7501810B2 (en) | 2000-09-05 | 2009-03-10 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US20080042374A1 (en) * | 2000-09-05 | 2008-02-21 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US7518358B2 (en) | 2000-09-05 | 2009-04-14 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US7969173B2 (en) | 2000-09-05 | 2011-06-28 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US20070273387A1 (en) * | 2001-08-31 | 2007-11-29 | Cascade Microtech, Inc. | Optical testing device |
US7550984B2 (en) | 2002-11-08 | 2009-06-23 | Cascade Microtech, Inc. | Probe station with low noise characteristics |
US7498828B2 (en) | 2002-11-25 | 2009-03-03 | Cascade Microtech, Inc. | Probe station with low inductance path |
US7639003B2 (en) | 2002-12-13 | 2009-12-29 | Cascade Microtech, Inc. | Guarded tub enclosure |
US20040135133A1 (en) * | 2002-12-27 | 2004-07-15 | Ngk Insulators, Ltd. | Polymer insulator apparatus and method of mounting same |
US6897384B2 (en) * | 2002-12-27 | 2005-05-24 | Ngk Insulators, Ltd. | Polymer insulator apparatus and method of mounting same |
US7492172B2 (en) | 2003-05-23 | 2009-02-17 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US7876115B2 (en) | 2003-05-23 | 2011-01-25 | Cascade Microtech, Inc. | Chuck for holding a device under test |
US8069491B2 (en) | 2003-10-22 | 2011-11-29 | Cascade Microtech, Inc. | Probe testing structure |
US7688091B2 (en) | 2003-12-24 | 2010-03-30 | Cascade Microtech, Inc. | Chuck with integrated wafer support |
US7504823B2 (en) | 2004-06-07 | 2009-03-17 | Cascade Microtech, Inc. | Thermal optical chuck |
US8319503B2 (en) | 2008-11-24 | 2012-11-27 | Cascade Microtech, Inc. | Test apparatus for measuring a characteristic of a device under test |
Also Published As
Publication number | Publication date |
---|---|
FR2232047B1 (fr) | 1978-01-06 |
JPS5031392A (fr) | 1975-03-27 |
DE2406106B2 (de) | 1980-04-24 |
DE2406106C3 (de) | 1981-01-08 |
FR2232047A1 (fr) | 1974-12-27 |
JPS5479B2 (fr) | 1979-01-05 |
DE2406106A1 (de) | 1974-12-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: VARIAN ASSOCIATES, INCORPORATED, 611 HANSEN WAY, P Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CONTINENTAL ELECTRONICS MFG. CO., A CORP OF TX.;REEL/FRAME:004522/0534 Effective date: 19860206 |
|
AS | Assignment |
Owner name: CONTINENTAL ELECTRONICS CORPORATION, 4212 SOUTH BU Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:VARIAN ASSOCIATES, INC.;REEL/FRAME:005662/0912 Effective date: 19910928 |