US2065315A - Flexible guard for bushing terminals - Google Patents

Flexible guard for bushing terminals Download PDF

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Publication number
US2065315A
US2065315A US732769A US73276934A US2065315A US 2065315 A US2065315 A US 2065315A US 732769 A US732769 A US 732769A US 73276934 A US73276934 A US 73276934A US 2065315 A US2065315 A US 2065315A
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United States
Prior art keywords
boot
bushing
conductor
cylindrical portions
transformer
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Expired - Lifetime
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US732769A
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Howard B Keath
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Wagner Electric Corp
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Wagner Electric Corp
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Priority to US732769A priority Critical patent/US2065315A/en
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    • 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
    • H01B17/26—Lead-in insulators; Lead-through insulators

Definitions

  • My invention relates to guards and more particularly to guards for the exterior terminal end of a stud type bushing employed in insulating a transformer conductor from the transformer housing.
  • a stud type bushing employed in insulating a transformer conductor from the transformer housing.
  • the bare end of the conductor exterior of the transformer housing is connected directly to the bare terminal end of the bushing which is connected to V the transformer proper.
  • cover and insulate this connection by wrapping insulating tape around the bare parts but this procedure is slow and expensive and, furthermore, it makes repairing difficult due to the necessity of cutting and peeling off the tape.
  • Glass cups havealso been used as guards for the terminal end of the bushing but they have been found to be undesirable since the fragile glass will not withstand the rough handling received from construction and repair men.
  • One of the objects of my invention is to provide a guard or boot for the exterior terminal end of an insulating bushing which is made of flexible material and is adapted to completely cover the bare terminal and the bare end of the conductor connected thereto.
  • Another object of my invention is to provide a flexible boot for the terminal end of an .insulating bushing which is readily adaptable to different types of bushings and to different size conductors connected to the terminal of the bushings.
  • a more specific object of my invention is to provide a tubular corrugated boot of rubber for the terminal end of a bushing, which boot is provided with openings in its wall to permit drainage of water from the interior thereof.
  • Still another object of my invention is to provide a guard for the terminal of an insulating bushing and the conductor connected therewith which is unbreakable, economical to manufacture, and easily attached and detached.
  • Figure 1 is a side view of an insulating bushing provided with my improved guard
  • Figure 2 is a cross-sectional view of the structure shown in Figure 1
  • Figure 3 is a cross-sec- 50 tional view of a slightly modified construction.
  • the numeral I indicates the wall of a transformer housing which is provided with an opening 2 for receiving the corrugated porcelain member 3 of a stud type insulating bushing.
  • the member 3 is the bare en'd provided with a shoulder 4 and with suitable fastening means broadly indicated at 5 for detachably clamping the bushing to the wall I.
  • the conductor 6, which is attached to the transformer within the housing, extends into the bore 5 1 of the porcelain member and has its bare end secured by solder in one end of a stud 8, the other end of the stud extending to the exterior of the bore and being provided with a threaded portion 9.
  • the stud is prevented from rotation 10 in the member 3 by means of a key In fitting in a groove H.
  • the threaded end 9 of the stud has secured thereto a member l2 upon which lies a member I 3 adapted to be clamped thereto by means of U-bolts I4 in a well known man- 15 ner. Between these members l2 and 13 extends the bare end 15 of the insulated conductor l6 forming the outgoing lead of the transformer.
  • a gasket I1 is provided between the porcelain member and the member l2 to make the assemd bly oil-tight.
  • a flexible boot I8 as an insulating means and guard for therexposed members l2 and 13 forming the terminal end of the bushing and the bare end l5 of the conductor Hi, the boot It! being preferably made of rubber.
  • the boot is tubular in form and provided with a plurality of corrugations between its ends.
  • One end of the boot has an inwardly extending integral o flange l9 which is adapted to be stretched and slipped over the end corrugation 20 of the porcelain member 3 to detachably secure that end to the bushing proper.
  • the other end of the boot has a plurality of stepped integral cylindricaf'portions 2
  • the wall thereof is formed with a plurality 40 of openings 22, as shown, the openings being so placed as to insure drainage when the bushing is either horizontally or vertically positioned.
  • My novel guard is very readily installed and also readily detachedto permit of repair.
  • the conductor I6 is unclamped from the members l2 and I3, if not already so, and" the boot is slipped over the end of the wire to such an extent that the boot can be longitudinally compressed sufliciently that IS of the conductor can be clamped between the members I2 and I3.
  • the boot is then permitted to become extended so that the flange l9 may be stretched and slipped over the corrugations 20 on the porcelain member 3.
  • the stepped cylindrical portions are provided on the conductor end of the boot in order to adapt the boot to different size conductors. All that is necessary to secure a larger opening is to sever the desired number of cylindrical portions from the boot.
  • I have shown the boot fltted to a larger size conductor 16', the inner cylindrical portion 2
  • I have also shown the boot applied to a bushing wherein the porcelain member 3 is of smaller diameter.
  • a washer 23 is placed between the member l2 and the porcelain member 3, which washer has slipped over it the flanged portion l9 of the boot.
  • I have constructed a very efllcient boot for the terminal end of a standard type bushing which both insulates and guards the bare parts thereof.
  • the boot is unbreakable and is readily attached and detached.
  • the boot is also adaptable for use with different size bushings and conductors, thus making it possible to reduce the number of different size boots necessary to carry in stock to flt the varying sizes of bushings and conductors.
  • the boot because of its flexibility and corrugated form, also readily adapts itself to conditions where the conductor I6 is bent at an angle to the axis of the bushing adjacent the terminal thereof.
  • My novel boot also permits the drainage of water from the interior of the boot in all of its positions.
  • a flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exterior terminal end of a transformer bushing on a transformer housing, said boot having a cylindrical intermediate portion, one end of the boot having an inwardly extending annular attaching flange and the other end which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the main body of the boot whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, the largest of said stepped cylindrical portions being substantially of less diameter than the diameter of the boot and the over-all length of said stepped portions being a fraction of the length of the remainder of the boot.
  • a flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exte- 'rior terminal end on a transformer bushing on a transformer housing, said boot having a cylindrical intermediate portion, one end of the boot having an inwardly extending annular attaching flange and the other end which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the main body of the boot whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, the largest of said stepped cylindrical portions being substantially of less diameter than the diameter of the boot and the over-all length of said stepped portions being a fraction of the length of the remainder of the boot, said boot also being provided with an opening in its wall for permitting water to drain from the interior thereof.
  • a flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exterior terminal end of a transformer bushing on a transformer housing, said boot being corrugated over an intermediate portion to permit the boot to be longitudinally collapsed, one end of said boot having an inwardly extending annular attaching flange and the other end which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the body of the boot whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, said stepped cylindrical portions having an over-all length substantially less than the length of the remainder of the boot.
  • a flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exterior terminal end of a transformer bushing on a transformer housing, said boot being of cylin-.
  • the end adjacent the corrugated portion having an inwardly extending annular attaching flange and the other end adjacent the cylindrical portion which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the cylindrical portion whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, said stepped cylindrical portions having an over-all length substantially less than the length of the remainder of the boot.

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  • Housings And Mounting Of Transformers (AREA)

Description

Dec. 22, 1936. H. B. KEATH FLEXIBLE GUARD FOR BUSHING TERMINALS Filed June 28, 1954 Inventdr H.B. KEATH BY I Patented Dec. 22, 1936 PATENT OFFICE FLEXIBLE GUARD FOR BUSHING TERMINALS Howard B. Keath,
St. Louis, Mo., assignor to Wagner Electric Corporation, St. Louis, Mo., a corporation of Delaware Application June 28, 1934, Serial No. 732,769
4 Claims.
My invention relates to guards and more particularly to guards for the exterior terminal end of a stud type bushing employed in insulating a transformer conductor from the transformer housing. In bushings of this type the bare end of the conductor exterior of the transformer housing is connected directly to the bare terminal end of the bushing which is connected to V the transformer proper. It has been the practice in the past to cover and insulate this connection by wrapping insulating tape around the bare parts but this procedure is slow and expensive and, furthermore, it makes repairing difficult due to the necessity of cutting and peeling off the tape. Glass cups havealso been used as guards for the terminal end of the bushing but they have been found to be undesirable since the fragile glass will not withstand the rough handling received from construction and repair men.
One of the objects of my invention is to provide a guard or boot for the exterior terminal end of an insulating bushing which is made of flexible material and is adapted to completely cover the bare terminal and the bare end of the conductor connected thereto.
Another object of my invention is to provide a flexible boot for the terminal end of an .insulating bushing which is readily adaptable to different types of bushings and to different size conductors connected to the terminal of the bushings. I
A more specific object of my invention is to provide a tubular corrugated boot of rubber for the terminal end of a bushing, which boot is provided with openings in its wall to permit drainage of water from the interior thereof.
Still another object of my invention is to provide a guard for the terminal of an insulating bushing and the conductor connected therewith which is unbreakable, economical to manufacture, and easily attached and detached.
Other objects of my invention will become apparent from the following description taken in 45 connection with the accompanying drawing in which Figure 1 is a side view of an insulating bushing provided with my improved guard; Figure 2 is a cross-sectional view of the structure shown in Figure 1; and Figure 3 is a cross-sec- 50 tional view of a slightly modified construction.
Referring to the drawing in detail, the numeral I indicates the wall of a transformer housing which is provided with an opening 2 for receiving the corrugated porcelain member 3 of a stud type insulating bushing. The member 3 is the bare en'd provided with a shoulder 4 and with suitable fastening means broadly indicated at 5 for detachably clamping the bushing to the wall I. The conductor 6, which is attached to the transformer within the housing, extends into the bore 5 1 of the porcelain member and has its bare end secured by solder in one end of a stud 8, the other end of the stud extending to the exterior of the bore and being provided with a threaded portion 9. The stud is prevented from rotation 10 in the member 3 by means of a key In fitting in a groove H. The threaded end 9 of the stud has secured thereto a member l2 upon which lies a member I 3 adapted to be clamped thereto by means of U-bolts I4 in a well known man- 15 ner. Between these members l2 and 13 extends the bare end 15 of the insulated conductor l6 forming the outgoing lead of the transformer.
A gasket I1 is provided between the porcelain member and the member l2 to make the assemd bly oil-tight.
In accordance with my invention I provide a flexible boot I8 as an insulating means and guard for therexposed members l2 and 13 forming the terminal end of the bushing and the bare end l5 of the conductor Hi, the boot It! being preferably made of rubber. The boot is tubular in form and provided with a plurality of corrugations between its ends. One end of the boot has an inwardly extending integral o flange l9 which is adapted to be stretched and slipped over the end corrugation 20 of the porcelain member 3 to detachably secure that end to the bushing proper. The other end of the boot has a plurality of stepped integral cylindricaf'portions 2|, the smallest of which is adapted to snugly fit around the conductor I6. In order to provide for the drainage of any water that may collect in the interior of the boot, the wall thereof is formed with a plurality 40 of openings 22, as shown, the openings being so placed as to insure drainage when the bushing is either horizontally or vertically positioned.
My novel guard is very readily installed and also readily detachedto permit of repair. In installing the boot the conductor I6 is unclamped from the members l2 and I3, if not already so, and" the boot is slipped over the end of the wire to such an extent that the boot can be longitudinally compressed sufliciently that IS of the conductor can be clamped between the members I2 and I3. The boot is then permitted to become extended so that the flange l9 may be stretched and slipped over the corrugations 20 on the porcelain member 3.
The stepped cylindrical portions are provided on the conductor end of the boot in order to adapt the boot to different size conductors. All that is necessary to secure a larger opening is to sever the desired number of cylindrical portions from the boot. In Figure 3, I have shown the boot fltted to a larger size conductor 16', the inner cylindrical portion 2| being clipped off. In Figure 3, I have also shown the boot applied to a bushing wherein the porcelain member 3 is of smaller diameter. In order to provide a proper attaching rib, a washer 23 is placed between the member l2 and the porcelain member 3, which washer has slipped over it the flanged portion l9 of the boot.
From the foregoing description of my invention it is readily seen that I have constructed a very efllcient boot for the terminal end of a standard type bushing which both insulates and guards the bare parts thereof. The boot is unbreakable and is readily attached and detached. The boot is also adaptable for use with different size bushings and conductors, thus making it possible to reduce the number of different size boots necessary to carry in stock to flt the varying sizes of bushings and conductors. The boot, because of its flexibility and corrugated form, also readily adapts itself to conditions where the conductor I6 is bent at an angle to the axis of the bushing adjacent the terminal thereof. My novel boot also permits the drainage of water from the interior of the boot in all of its positions.
Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:
l. A flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exterior terminal end of a transformer bushing on a transformer housing, said boot having a cylindrical intermediate portion, one end of the boot having an inwardly extending annular attaching flange and the other end which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the main body of the boot whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, the largest of said stepped cylindrical portions being substantially of less diameter than the diameter of the boot and the over-all length of said stepped portions being a fraction of the length of the remainder of the boot.
2. A flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exte- 'rior terminal end on a transformer bushing on a transformer housing, said boot having a cylindrical intermediate portion, one end of the boot having an inwardly extending annular attaching flange and the other end which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the main body of the boot whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, the largest of said stepped cylindrical portions being substantially of less diameter than the diameter of the boot and the over-all length of said stepped portions being a fraction of the length of the remainder of the boot, said boot also being provided with an opening in its wall for permitting water to drain from the interior thereof.
3. A flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exterior terminal end of a transformer bushing on a transformer housing, said boot being corrugated over an intermediate portion to permit the boot to be longitudinally collapsed, one end of said boot having an inwardly extending annular attaching flange and the other end which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the body of the boot whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, said stepped cylindrical portions having an over-all length substantially less than the length of the remainder of the boot.
4. A flexible tubular insulating boot for totally enclosing and protecting the connection between an electrical conductor and the exterior terminal end of a transformer bushing on a transformer housing, said boot being of cylin-.
drlcal formation over a portion of its length and corrugated over the remainder, the end adjacent the corrugated portion having an inwardly extending annular attaching flange and the other end adjacent the cylindrical portion which is adapted to surround and grip a conductor being formed with a plurality of stepped integral cylindrical portions the largest of which is adjacent the cylindrical portion whereby the internal diameter of the opening in said last named end may be increased by severing one or more of said cylindrical portions from the boot, said stepped cylindrical portions having an over-all length substantially less than the length of the remainder of the boot.
HOWARD B. KEATH.
US732769A 1934-06-28 1934-06-28 Flexible guard for bushing terminals Expired - Lifetime US2065315A (en)

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468225A (en) * 1944-07-17 1949-04-26 Louis N Murphy Spark plug shield
US2468226A (en) * 1945-07-27 1949-04-26 Louis N Murphy Spark plug shield
US2506979A (en) * 1947-02-20 1950-05-09 Albert & J M Anderson Mfg Co Electrical connector
US2862042A (en) * 1955-08-22 1958-11-25 Minnesota Mining & Mfg Cable splice protector
US2866845A (en) * 1955-06-06 1958-12-30 Ivan K Finney High voltage insulation mounting
US2875267A (en) * 1956-10-03 1959-02-24 Gen Electric Bushing terminal and line lead guard
US2883448A (en) * 1957-08-28 1959-04-21 Gen Electric Insulated clamping means
US2923762A (en) * 1955-12-27 1960-02-02 Cons Edison Co New York Inc Cable joint construction
US2943139A (en) * 1956-12-12 1960-06-28 Gen Motors Corp Cable connector
US2946839A (en) * 1959-02-24 1960-07-26 William A Horning Sleeve type joint protector
US2978533A (en) * 1957-12-26 1961-04-04 Robertson Electric Co Inc Cable splice enclosure
US3007995A (en) * 1959-10-01 1961-11-07 Schneiderman Joseph Device for shielding electrical terminals
US3147338A (en) * 1961-08-15 1964-09-01 Harold N Ekvall Longitudinally divided hinged insulating connector covers
US3238291A (en) * 1965-04-05 1966-03-01 Wagner Electric Corp Terminal cover
US3249679A (en) * 1964-10-02 1966-05-03 Virginia Plastics Protective cover for electrical connections and the like
US3510568A (en) * 1968-03-06 1970-05-05 Donald J Cochran Bushing terminal guard
US4201883A (en) * 1977-11-03 1980-05-06 Shepherd William E Guard for a high voltage electrical terminal bushing
US6303870B1 (en) * 1999-02-03 2001-10-16 Turbine Controls, Inc. Insulator cover
US20050073779A1 (en) * 2003-07-15 2005-04-07 Central Moloney, Inc. Wildlife guard for arrester brackets
US6963025B1 (en) * 2004-05-13 2005-11-08 Wisconsin Electric Power Company Wildlife protector guard for high voltage electrical termination
US6995313B1 (en) * 2005-04-07 2006-02-07 Central Moloney, Inc. Insulator bushing wildlife guard
EP1860672A1 (en) * 2006-05-23 2007-11-28 Pioch Bushing assembly designed to be mounted through an orifice in the wall of an electricity transformer
US9787071B1 (en) * 2015-09-08 2017-10-10 Gato Assets Llc Cover for electrical power distribution equipment

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468225A (en) * 1944-07-17 1949-04-26 Louis N Murphy Spark plug shield
US2468226A (en) * 1945-07-27 1949-04-26 Louis N Murphy Spark plug shield
US2506979A (en) * 1947-02-20 1950-05-09 Albert & J M Anderson Mfg Co Electrical connector
US2866845A (en) * 1955-06-06 1958-12-30 Ivan K Finney High voltage insulation mounting
US2862042A (en) * 1955-08-22 1958-11-25 Minnesota Mining & Mfg Cable splice protector
US2923762A (en) * 1955-12-27 1960-02-02 Cons Edison Co New York Inc Cable joint construction
US2875267A (en) * 1956-10-03 1959-02-24 Gen Electric Bushing terminal and line lead guard
US2943139A (en) * 1956-12-12 1960-06-28 Gen Motors Corp Cable connector
US2883448A (en) * 1957-08-28 1959-04-21 Gen Electric Insulated clamping means
US2978533A (en) * 1957-12-26 1961-04-04 Robertson Electric Co Inc Cable splice enclosure
US2946839A (en) * 1959-02-24 1960-07-26 William A Horning Sleeve type joint protector
US3007995A (en) * 1959-10-01 1961-11-07 Schneiderman Joseph Device for shielding electrical terminals
US3147338A (en) * 1961-08-15 1964-09-01 Harold N Ekvall Longitudinally divided hinged insulating connector covers
US3249679A (en) * 1964-10-02 1966-05-03 Virginia Plastics Protective cover for electrical connections and the like
US3238291A (en) * 1965-04-05 1966-03-01 Wagner Electric Corp Terminal cover
US3510568A (en) * 1968-03-06 1970-05-05 Donald J Cochran Bushing terminal guard
US4201883A (en) * 1977-11-03 1980-05-06 Shepherd William E Guard for a high voltage electrical terminal bushing
US6303870B1 (en) * 1999-02-03 2001-10-16 Turbine Controls, Inc. Insulator cover
US20050073779A1 (en) * 2003-07-15 2005-04-07 Central Moloney, Inc. Wildlife guard for arrester brackets
US7009102B2 (en) 2003-07-15 2006-03-07 Central Moloney, Inc. Wildlife guard for arrester brackets
US6963025B1 (en) * 2004-05-13 2005-11-08 Wisconsin Electric Power Company Wildlife protector guard for high voltage electrical termination
US6995313B1 (en) * 2005-04-07 2006-02-07 Central Moloney, Inc. Insulator bushing wildlife guard
EP1860672A1 (en) * 2006-05-23 2007-11-28 Pioch Bushing assembly designed to be mounted through an orifice in the wall of an electricity transformer
FR2901631A1 (en) * 2006-05-23 2007-11-30 Pioch Soc Par Actions Simplifi ROD-PITCH ASSEMBLY TO BE MOUNTED ACROSS AN ORIFICE OF A WALL OF AN ELECTRIC TRANSFORMER
US9787071B1 (en) * 2015-09-08 2017-10-10 Gato Assets Llc Cover for electrical power distribution equipment

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