US3161721A - Clamps of spacing devices for overhead electrical conductors - Google Patents
Clamps of spacing devices for overhead electrical conductors Download PDFInfo
- Publication number
- US3161721A US3161721A US240119A US24011962A US3161721A US 3161721 A US3161721 A US 3161721A US 240119 A US240119 A US 240119A US 24011962 A US24011962 A US 24011962A US 3161721 A US3161721 A US 3161721A
- Authority
- US
- United States
- Prior art keywords
- bush
- jaws
- clamp
- cross
- axis
- 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
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/12—Devices for maintaining distance between parallel conductors, e.g. spacer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T24/00—Buckles, buttons, clasps, etc.
- Y10T24/44—Clasp, clip, support-clamp, or required component thereof
- Y10T24/44291—Clasp, clip, support-clamp, or required component thereof including pivoted gripping member
- Y10T24/4453—Clasp, clip, support-clamp, or required component thereof including pivoted gripping member with position locking-means for gripping members
Definitions
- This invention relates to spacing devices for spacing the individualconductors of an electrical transmission line, usually those of one phase or pole of an electrical transmission line having a plurality of conductors per phase or pole, and has for its object to provide an improved form of clamp of the kind that is lined with a bush consisting of resilient or elastomeric material, through which bush one conductor is passed to secure the conductor to the spacing device.
- One of the objects of the present invention is to provide a construction of clamp and bush of a spacing device that permits divergence of the associated conductor from coaxiality with the clamp and bush in any direction within a substantial cone coaxial with the bush.
- a further object of the invention is to utilize the resilience of the resilient bush itself for positively locking the securing means of the clamp.
- the interior surface of the clamp, when closed, and the exterior surface of the bush are flared outwardly from the median plane transverse to the axis of the clamp and bush towards the ends of the area over which the bush seats in the clamp, the cross-sections of the clamp in planes containing the axis being internally convex and the similar cross-sections of the bush being externally concave.
- the cross-sections in planes containing the axis of the end portions of the walls of the bush are preferably convex and merge into flared end-portions of the bore of the bush.
- the end-portions of the in terior surface of the clamp may be concave in the crosssections containing the axis and are normally spaced from the convex ends of the wall of the bush, when the clamp is closed, but, when the bush is strained by deflection of a conductor gripped thereby fromcoaxiality with the bush and clamp, contact locally at one side with the convex end-portions of the Wall of the bush which yield resiliently under this contact.
- the concave and convex endportions of the clamp and the bush respectively may be circular arcs in cross-section.
- the radius of curvature of the concave end-portion of the clamp is preferably greater than that of the convex end-portion of the bush.
- the bore of the bush is preferably generally cylindrical at least at its mid-portion.
- the bore of the bush may be provided with helical lands and grooves to mate with the external surface of a conductor comprising a plurality of strands laid together.
- the bore of the bush may be serrated or knurled.
- the internal diameter of the 3,161,721 Patented Dec. 15, 1964 mid-portion of the clamp, when closed, in any plane transverse to its axis is smaller than the corresponding external diameter of the bush, when uncompressed, so that closure of the clamp on the bush causes deformation of the bush.
- the invention thus includes the combination of a conductor with a clamp as set forth wherein the cross-sectional area of the bore of the bush is not less than the cross-sectional area of the conductor, so that, when the clamp is closed, the bush is pre-stressed or subjected to substantial resilient deformation.
- the internal diameter of the mid-portion of the clamp, when closed, in any plane transverse to its axis may be substantially equal to the corresponding external diameter of the bush.
- the cross-sectional area of the bore of the bush is less than the cross-sectional area of the conductor, so that, when the clamp is closed, the bush is pre-stressed or subject to substantial resilient deformation.
- the clamp preferably comprises two jaws hinged to one another, each jaw having a hollow or channel that is, in any cross-section perpendicular to the hinge axis, of substantially arcuate or semi-circular shape, the areas of the cross-sections of the bore embraced or formed by the hollows or channels, when closed, being less than the sum of the corresponding cross-sectional areas of an uncompressed bush, when the latter embraces a conductor, and of the conductor, so that, when the hinged jaws are closed, the bush is subjected to resilient deformation or pie-loading.
- the areas of the cross-sections of the bore may be less than the areas embraced by the external periphery of the uncompressed bush in corresponding cross-sections.
- a locking device may be combined with the clamp, this locking device being such that it is positively retained in a locked attitude, securing the two jaws in a closed position about the bush, by force due to pre-loading of the bush.
- the locking device may comprise a headed shank extending through a slot or hole in one jaw, with its head abutting against that jaw, extending through a slot in the other jaw and provided with a transverse cotter adapted to overlie that other jaw and to seat in a groove formed in the outer surface of that other jaw.
- the length between the head and the cotter may be such that, in order that the cotter may pass over the other jaw into the groove, the bush must be substantially compressed or strained beyond the state of compression in which it remains after engagement of the cotter in the slot.
- FIG. 1 is an elevation of a clamp showing in cross-section a conductor to which the clamp is secured;
- FIG. 2 is a section in the plane II-II of FIG. 1;
- FIG. 3 is a section in the plane III-1H of FIG. 1;
- FIG. 4 is a plan view of one of the components of a split bush such as is shown in FIGS. 1 to 3;
- FIG. 5 is a section on the line V-V or FIG. 4.
- the clamp there shown by way of example comprises two jaws 1 and 2 that are hinged together by means of a hinge pin 3.
- the jaw 1 is mounted upon an arm 4 or other part of a spacing device for individual conductors of an electrical transmission line, which spacing device will usually hear one or more additional clamps for other conductors of the transmission line.
- the clamp houses between the jaws 1 and 2 a bush 5 of elastomeric material, as shown in FIG. 3.
- the interior surface of each jaw 1 and 2 of the clamp is flared outwardly at 6 and 7 from the median plane transverse to the axis of the clamp.
- the exterior surface of the bush 5 is flared outwardly from the median plane transverse to its axis at 8 and 9 as shown most clearly in FIG. 4.
- the cross-sections of the clamp in planes containing the axis are internally convex at 6 and 7, while the similar cross-sections of the bush 5 are externally concave at 8 and 9.
- the end-portions 11 and 12 of the walls of the bush 5 are convex and merge into slightly flared end-portions of the bore of the bush 5.
- the endportions of the interior surfaces of the jaws 1 and 2 are concave at 10 and are normally spaced from the convex end-portions 11 and 12 of the wall of the bush 5, when the clamp is closed, but, when the bush 5 is strained by deflection of a conductor 13 gripped thereby from coaxiality with the bush and clamp, contact locally at one side with the convex end-portions 11 and 12 of the bush which yield resiliently under this contact.
- the concave portions 10 of the clamp jaws and the convex portions 11 and 12 of the bush 5 are preferably circular arcs in cross-section.
- the mid-portion of the bore of the bush 5 is generally cylindrical, but may be provided with helical lands and grooves to mate with the external surface of a conductor comprising a plurality of strands or wires laid together.
- the surface of the bore of the bush 5 is preferably serrated or knurled.
- the bush 5 consists of two substantially semi-circular halves, so that it may be easily applied to a conductor without the need for passing it over an end of the conductor. It may have incorporated in it one or more layers 14 of square-mesh textile or wire or other reinforcement. Each half of the bush is preferably provided with a lug 15 projecting radially from its external periphery for engagement with a hole 16 in the jaw 1 or 2 of the clamp so as to hold the bush in the jaw and thus facilitate application of the clamp to a conductor.
- a locking device In order to secure the clamp in a closed and locked attitude, a locking device is provided that is positively retained in a locked attitude, securing the jaws 1 and 2 in a closed position about the bush 5, by the force due to pre-loading of the bush in a manner that will be later described.
- This locking device comprises, in the example illustrated in the drawings, a shank 17 having a head 13 and extending through a slot or hole 19 in the jaw 1 with its head abutting against that jaw.
- the shank 17 extends through a slot 20 in the other jaw 2 and is provided with a transverse cotter 21 that is adapted to overlie the jaw 2 and to seat in a groove 22 formed in the outer surface of that jaw.
- the length between the head 18 and cotter 21 is such that, in order that the cotter 21 may pass over the jaw 2 into the groove 22, the bush 5 must be substantially compressed or strained beyond the state of compression in which it remains after engagement of the cotter 21 in the groove 22.
- the bore of the bush 5 may conveniently have a crosssectional area substantially equal to that of the conductor 13 that it is to embrace.
- the internal diameter of the mid-portion 9 of the clamp, when closed, in any plane transverse to its axis is substantially smaller than the corresponding external diameter of the bush 5.
- the cross-sectional area of the bore of the bush 5 may be substantially less than that of the conductor 13, in which case the internal diameter of the said portion 9 of the clamp, when closed, in any plane transverse to its axis is substantially equal to the corresponding external diameter of the bush. In either case, when the bush is assembled on a conductor and the clamp is closed about it, the bush is subject to substantial precompression and resilient deformation.
- a manually operable screw clamp may be provided as an accessory, by means of which the jaws 1 and 2 may be easily forced together sufficiently for engagement of the cotter.
- the bush 5 When the jaws 1 and 2 are closed and secured by the cotter 21, the bush 5 is subjected to substantial compression and deformation so that the bush is securely attached to the conductor. However, if the conductor is deflected from coaxiality with the bush, the latter is capable of further deformation, thus to accommodate such deflection without local injury to the conductor.
- a clamp for a spacing device for spacing the individual conductors of an electrical transmission line comprising at least two rigid jaws, a bush consisting of elastomeric material embraced and compressed by said jaws and adapted to embrace an electrical conductor, the interior surfaces of said jaws and the exterior surface of said bush being of circular symmetary about an axis and being flared outwardly from the median plane transverse to the axis of said clamp and bush towards the ends of the area over which said bush seats in said clamp, the cross-section of the interior surfaces of said jaws in planes containing the axis being the arc of a circle and convex, the similar cross-sections of the exterior surface of said bush being the arc of a circle and concave, and the radius of curvature of the said cross sections of said interior surfaces of said jaws being greater than the radius of curvature of said cross-sections of said exterior surface of the uncompressed bush.
- a clamp for a spacing device for spacing the individual conductors of an electrical transmission line comprising at least two rigid jaws, a bush consisting of elastomeric material embraced and compressed by said jaws and adapted to embrace an electrical conductor, the interior surfaces of said jaws being in cross-section containing the axis of said jaws and said bush, of a convex and circular arc configuration along the axial length of said jaws upon which said bush seats on said jaws, the exterior surface of said bush being in cross-section containing the axis thereof, of a concave and circular are configuration, the radius of curvature of said interior surface of said jaws being greater than the radius of curvature of said exterior surface of the uncompressed bush, and said interior and exterior surfaces merging into terminal portions of said jaws and said bush that are spaced from one another and are respectively concave and convex in crosssection, the radius of curvature of said cross-section of said terminal portions of said jaws exceeding that of said cross-sections of said terminal portion of said bush.
- a clamp for a spacing device for spacing the individual conductors of an electrical transmission line comprising a bush consisting of elastomeric material, a pair of jaw hinged to one another at one end and embracing and compressing the bush, said jaws having aligned elongate slots formed in their other ends and one of said jaws having a transverse groove formed in the external surface thereof and intersecting the slot therein, fastening means comprising a shank extending through said slots having near one end thereof a transverse cotter detachably engaging said groove and having at its other end a head engaging the exterior of the other of said jaws, said shank being retained under tension and said cotter being retained in said groove by the compression of said bush between said jaws, the interior surface of said jaws and the exterior surface of said bush being of a circular symmetry about an axis and being flared outwardly from the median plane transverse to the axis of said clamp and said bush towards the ends of the area over which said bush seats in said clamp, the cross sections of the interior surfaces of
- a clamp for a spacing device for spacing the individual conductors of an electrical transmission line compressing a bush consisting of elastomeric material, a pair of jaws hinged to one another at one end and embracing and compressing the bush, said jaws having aligned elongate slots formed in their other ends and one of said jaws having a transverse groove formed in the external surface thereof and intersecting the slot therein, fastening means comprising a shank extending through said slots having near one end thereof a traverse cotter detachably engaging said groove and having at its other end a head engaging the exterior of the other of said jaws, said shank being retained under tension and said cotter being retained in said groove by the compression of said bush between said jaws, the interior surfaces of said jaws being, in cross-section containing the axis of said jaws and said bush, each of a convex and circular arc configuration over the axial length of said jaws over which said bush seats on said jaws, the exterior surface of said bush being, in cross-section
Landscapes
- Suspension Of Electric Lines Or Cables (AREA)
- Insulating Bodies (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB24473/61A GB929693A (en) | 1961-07-06 | 1961-07-06 | Improvements in or relating to clamps for spacing devices for overhead electrical conductors |
Publications (1)
Publication Number | Publication Date |
---|---|
US3161721A true US3161721A (en) | 1964-12-15 |
Family
ID=10212249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US240119A Expired - Lifetime US3161721A (en) | 1961-07-06 | 1962-11-26 | Clamps of spacing devices for overhead electrical conductors |
Country Status (5)
Country | Link |
---|---|
US (1) | US3161721A (nl) |
BE (1) | BE625725A (nl) |
FR (1) | FR1339921A (nl) |
GB (1) | GB929693A (nl) |
NL (1) | NL286504A (nl) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3308228A (en) * | 1965-08-19 | 1967-03-07 | Fanner Mfg Co | Line spacer, damper and corona eliminating means |
US3383739A (en) * | 1966-04-14 | 1968-05-21 | Pitzel Bernard Henry | Self-locking clamp |
US3397431A (en) * | 1967-05-12 | 1968-08-20 | Hydro Craft Inc | Tube clamp assembly |
US3463870A (en) * | 1968-02-14 | 1969-08-26 | Preformed Line Products Co | Spacer/damper |
US3924055A (en) * | 1973-10-27 | 1975-12-02 | Dunlop Ltd | Cable spacer for overhead power transmission lines |
US3963855A (en) * | 1975-09-05 | 1976-06-15 | Aluminum Company Of America | Boltless spacer clamp |
US3971881A (en) * | 1975-10-29 | 1976-07-27 | Aluminum Company Of America | Damping spacer for three conductor bundle |
US4178467A (en) * | 1978-07-07 | 1979-12-11 | Aluminum Company Of America | Boltless spacer device |
US4262869A (en) * | 1978-10-23 | 1981-04-21 | Walter Stauffenberg Kg | Clamp for elongated cylindrical workpiece |
US5784764A (en) * | 1996-11-04 | 1998-07-28 | Djordjevic; Alexander S. | Coupling device for quick engagement and release |
US5936197A (en) * | 1995-09-05 | 1999-08-10 | The Furukawa Electric Co., Ltd. | Clamp for overhead line and method of attachment thereof |
US6170783B1 (en) | 1998-07-29 | 2001-01-09 | Hendrix Wire & Cable, Inc. | Aerial cable retainer with resilient pad |
US6198042B1 (en) * | 1996-03-19 | 2001-03-06 | Tyco Electronics Logistics Ag | Suspension clamps |
US20110215123A1 (en) * | 2010-03-08 | 2011-09-08 | Garcia Jr Robert James | Nitrous Oxide Bottle Carrier |
US20110243737A1 (en) * | 2011-03-03 | 2011-10-06 | General Electric Company | Method and system for securing lighting protection cables in a wind turbine rotor blade |
GB2492558A (en) * | 2011-07-04 | 2013-01-09 | Preformed Line Products Gb Ltd | Spacer damper clamp arm with semi-conductive elastomer liners |
US20130206455A1 (en) * | 2011-06-08 | 2013-08-15 | Hubbell Incorporated | Elastomeric Gripping Member For Spacer Assembly |
US9570897B2 (en) | 2014-02-11 | 2017-02-14 | Hubbell Incorporated | Hinged clamp for spacer-damper |
WO2017116433A1 (en) * | 2015-12-30 | 2017-07-06 | Preformed Line Products | Cable spacer clamp arm liner |
US9948080B2 (en) | 2015-12-30 | 2018-04-17 | Preformed Line Products Co. | Cable spacer clamp arm liner |
US10367343B2 (en) * | 2015-10-16 | 2019-07-30 | State Grid Henan Electric Power Research Institute | Rigid-collision-free transmission line spacer clamp connection structure |
US11652344B2 (en) | 2020-02-28 | 2023-05-16 | Preformed Line Products Co. | Cable spacer comprising a ratchet spacer clamp |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US92299A (en) * | 1869-07-06 | Improvement in telegraph-insulators | ||
US888154A (en) * | 1907-10-07 | 1908-05-19 | Walter J Stevens | Insulator. |
US918905A (en) * | 1908-09-05 | 1909-04-20 | Benjamin A Pond | Insulator. |
US1527346A (en) * | 1922-05-29 | 1925-02-24 | Brady Electric & Mfg Company | Flexible insulator |
US2024831A (en) * | 1933-06-02 | 1935-12-17 | Porcelain Products Inc | Insulator |
GB722083A (en) * | 1952-11-29 | 1955-01-19 | Taylor And Osborne Ltd | Improvements relating to a tubular cleat or clamp for use in supporting a cable, conduit or the like |
US2915580A (en) * | 1956-08-02 | 1959-12-01 | Balfour Beatty & Co Ltd | Spacing devices for overhead wires |
-
0
- NL NL286504D patent/NL286504A/xx unknown
- BE BE625725D patent/BE625725A/xx unknown
-
1961
- 1961-07-06 GB GB24473/61A patent/GB929693A/en not_active Expired
-
1962
- 1962-11-23 FR FR916380A patent/FR1339921A/fr not_active Expired
- 1962-11-26 US US240119A patent/US3161721A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US92299A (en) * | 1869-07-06 | Improvement in telegraph-insulators | ||
US888154A (en) * | 1907-10-07 | 1908-05-19 | Walter J Stevens | Insulator. |
US918905A (en) * | 1908-09-05 | 1909-04-20 | Benjamin A Pond | Insulator. |
US1527346A (en) * | 1922-05-29 | 1925-02-24 | Brady Electric & Mfg Company | Flexible insulator |
US2024831A (en) * | 1933-06-02 | 1935-12-17 | Porcelain Products Inc | Insulator |
GB722083A (en) * | 1952-11-29 | 1955-01-19 | Taylor And Osborne Ltd | Improvements relating to a tubular cleat or clamp for use in supporting a cable, conduit or the like |
US2915580A (en) * | 1956-08-02 | 1959-12-01 | Balfour Beatty & Co Ltd | Spacing devices for overhead wires |
Cited By (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3308228A (en) * | 1965-08-19 | 1967-03-07 | Fanner Mfg Co | Line spacer, damper and corona eliminating means |
US3383739A (en) * | 1966-04-14 | 1968-05-21 | Pitzel Bernard Henry | Self-locking clamp |
US3397431A (en) * | 1967-05-12 | 1968-08-20 | Hydro Craft Inc | Tube clamp assembly |
US3463870A (en) * | 1968-02-14 | 1969-08-26 | Preformed Line Products Co | Spacer/damper |
US3924055A (en) * | 1973-10-27 | 1975-12-02 | Dunlop Ltd | Cable spacer for overhead power transmission lines |
US3963855A (en) * | 1975-09-05 | 1976-06-15 | Aluminum Company Of America | Boltless spacer clamp |
US3971881A (en) * | 1975-10-29 | 1976-07-27 | Aluminum Company Of America | Damping spacer for three conductor bundle |
US4178467A (en) * | 1978-07-07 | 1979-12-11 | Aluminum Company Of America | Boltless spacer device |
US4262869A (en) * | 1978-10-23 | 1981-04-21 | Walter Stauffenberg Kg | Clamp for elongated cylindrical workpiece |
US5936197A (en) * | 1995-09-05 | 1999-08-10 | The Furukawa Electric Co., Ltd. | Clamp for overhead line and method of attachment thereof |
US6096970A (en) * | 1995-09-05 | 2000-08-01 | The Furukawa Electric Co., Ltd. | Clamp for overhead line having expansion means and cam means |
US6198042B1 (en) * | 1996-03-19 | 2001-03-06 | Tyco Electronics Logistics Ag | Suspension clamps |
US5784764A (en) * | 1996-11-04 | 1998-07-28 | Djordjevic; Alexander S. | Coupling device for quick engagement and release |
US6170783B1 (en) | 1998-07-29 | 2001-01-09 | Hendrix Wire & Cable, Inc. | Aerial cable retainer with resilient pad |
US20110215123A1 (en) * | 2010-03-08 | 2011-09-08 | Garcia Jr Robert James | Nitrous Oxide Bottle Carrier |
US20110243737A1 (en) * | 2011-03-03 | 2011-10-06 | General Electric Company | Method and system for securing lighting protection cables in a wind turbine rotor blade |
US9570216B2 (en) | 2011-06-08 | 2017-02-14 | Hubbell Incorporated | Elastomeric gripping member for spacer assembly |
US20130206455A1 (en) * | 2011-06-08 | 2013-08-15 | Hubbell Incorporated | Elastomeric Gripping Member For Spacer Assembly |
US9093202B2 (en) * | 2011-06-08 | 2015-07-28 | Hubbell Incorporated | Elastomeric gripping member for spacer assembly |
EP2544321A1 (en) * | 2011-07-04 | 2013-01-09 | Preformed Line Products (GB) Limited | Spacer damper clamp arm |
GB2492558B (en) * | 2011-07-04 | 2014-04-16 | Preformed Line Products Gb Ltd | Spacer damper clamp arm |
GB2492558A (en) * | 2011-07-04 | 2013-01-09 | Preformed Line Products Gb Ltd | Spacer damper clamp arm with semi-conductive elastomer liners |
US9570897B2 (en) | 2014-02-11 | 2017-02-14 | Hubbell Incorporated | Hinged clamp for spacer-damper |
US10396538B2 (en) | 2014-02-11 | 2019-08-27 | Hubbell Incorporated | Hinged clamp for spacer-damper |
US10367343B2 (en) * | 2015-10-16 | 2019-07-30 | State Grid Henan Electric Power Research Institute | Rigid-collision-free transmission line spacer clamp connection structure |
WO2017116433A1 (en) * | 2015-12-30 | 2017-07-06 | Preformed Line Products | Cable spacer clamp arm liner |
US9948080B2 (en) | 2015-12-30 | 2018-04-17 | Preformed Line Products Co. | Cable spacer clamp arm liner |
EP3381098A1 (en) * | 2015-12-30 | 2018-10-03 | Preformed Line Products Company | Cable spacer clamp arm liner |
US11652344B2 (en) | 2020-02-28 | 2023-05-16 | Preformed Line Products Co. | Cable spacer comprising a ratchet spacer clamp |
Also Published As
Publication number | Publication date |
---|---|
GB929693A (en) | 1963-06-26 |
FR1339921A (fr) | 1963-10-11 |
NL286504A (nl) | |
BE625725A (nl) |
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