CA2228669A1 - Paint penetrating ground clamp for painted raised floor pedestals - Google Patents
Paint penetrating ground clamp for painted raised floor pedestals Download PDFInfo
- Publication number
- CA2228669A1 CA2228669A1 CA 2228669 CA2228669A CA2228669A1 CA 2228669 A1 CA2228669 A1 CA 2228669A1 CA 2228669 CA2228669 CA 2228669 CA 2228669 A CA2228669 A CA 2228669A CA 2228669 A1 CA2228669 A1 CA 2228669A1
- Authority
- CA
- Canada
- Prior art keywords
- conductor
- clamp part
- grounding connector
- electrical grounding
- floor pedestal
- 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.)
- Abandoned
Links
- 239000003973 paint Substances 0.000 title claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 title description 2
- 239000004020 conductor Substances 0.000 claims abstract description 84
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/38—Clamped connections, spring connections utilising a clamping member acted on by screw or nut
- H01R4/46—Clamping area between two screws placed side by side
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/304—Clamped connections, spring connections utilising a screw or nut clamping member having means for improving contact
Landscapes
- Connector Housings Or Holding Contact Members (AREA)
- Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
Abstract
An electrical grounding connector comprising a U-bolt, an upper clamp part and a lower clamp part. The upper clamp part is connected to the U-bolt to clamp a floor pedestal therebetween. The lower clamp part is connected to the U-bolt to clamp a conductor between the upper and lower clamp parts. The upper clamp part has a stepped surface therein to penetrate through paint on the floor pedestal.
Description
~.
PAINT ~N~lnATING GROUND CLAMP FOR
PAINTED RAISED FLOOR PEDESTALS
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Appli_ation No. 60/040,498 filed March 10, 1997.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to electrical connectors, and m~re specifically to grounding connectors.
PAINT ~N~lnATING GROUND CLAMP FOR
PAINTED RAISED FLOOR PEDESTALS
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the benefit of U.S. Provisional Appli_ation No. 60/040,498 filed March 10, 1997.
BACKGROUND OF THE INVENTION
1. Field of the Invention The present invention relates to electrical connectors, and m~re specifically to grounding connectors.
2. Prior Art US Patent No. 5,004,437 discloses an electrical connector comprising a base member and a clamp member for clamping a wire therebetween. A requirement has arisen to properly ground newly designed painted raised floor pedestals used in earthquake and other critical applications. These pedestals are used to raise flooring for computer rooms and telecommunications equipment areas, in addition to othe applications.
A set number of pedestals per square area is required to be bonded using copper conductor with a range of #6 awg to 2,'0 awg. A single conductor or two conductors are attached perpendicularly to the pedestal. Currently these pedestals are being bonded with the use of the Burncy GAR1726 ground clamp connector which is attached to the bare metal surface, thus enabling an effective electrical connectlon. The removal of the paint from the 2ci pedestals is time consuming and costly for the installers of these connectors. It was desired to develop a connector that would make such removal of paint unnecessary. This connector would have some means that would penetrate the paint when installed, maklng a proper connection. The connector must meet all requirements of UL st~ndard 467 Grounding and Bonding Equipment for the intencied conductor range. The connector is also required to st~nd up to the rigors of the extreme conditions of an earthquake and still maintain electrical contact.
There may also be a need to ground rectangular unpainted raise(~ floor pedestals. No paint penetrating device would be needed for this application, only a connector that would accommodate its rectangular configuration.
SUMMARY OF THE INVENTION
The present invention provides a solution to this problem by modifying a standard GE~ type connector such that the groove that accepts the pedestal is machined creating a series of steps. The sharp edge formed by these steps contact the surface of the pedestal. ~hen the U-bolt of the c~onnector is tightened to its proper torque, these edges penetrate through the paint enabling contact with the metallic pedestal and the connector. The profile of steps can be configured such that it would also acco~Lmodate a rectangular raised floor pedestal.
The present invention comprises a cast copper alloy ground clamp that attaches to painted metallic raised floor pedestals whlch permits durlng installation, connection to stranded or solid copper conductors. The surf~ce of the groove of t:he connector, which accepts the painced metallic raised floor pedestal, has a series of machined steps that run parallel to the length of the pedestal. These steps fc,rm sharp edges. The steps are dimensioned such that when the pedestal is placed in the groove, each edge is in contact with the surface of the pedestal. When the connector is assembled, and is tightened to the required torque, these edges penetrate through the painted surface of the pedestal thereby making contact with the metallic portion of the pedestal, thus ~nabling an electrical connection with relatively low resistance.
In accordance with one embodiment of the present invention, an electrical grounding connector is provided comprising a U-bolt, an upper clamp part and a lower clamp part. The upper clamp part is connected to the U-bolt l-o clamp a floor pedestal therebetween. The lower clamp part is connected to the U-bolt to clamp a conductor between the upper and lower clamp parts. The upper clamp part has a stepped surface therein to penetrate through paint on the floor pedestal.
In accordance with another embodiment of the present invent:ion, an electrical grounding connector is provided comprising a first clamp member, means for clamping the first clamp member to a floor pedestal and conductor retaining means. The conductor retaining means mechanically and electrically connect a conductor to the first clamp member. The first clamp member has a step thereon so that, when the first clamp is clamped against the floor pedestal, the step pierces an exterior surface of the floor pedestal making electrical contact with the floor pedestal.
In accordance with stilL another embodiment of the present invention, an electrical grounding connector is provi~ed comprising a first clamp member, a fastener connector thereto and conductor retaining means. The fastener is connected to the first clamp member to clamp a floor pedestal therebetween. The conductor retaining means connect a conductor to the first clamp member. The first clamp mernber has a pair of steps forming a recess -therebetween. The recess is adapted to receive a rectangular portion of a iirst type of floor pedestal.
When t:he first clamp member is attached to a cylindrical portion of a second type oi- floor pedestal, edges of the pair of steps effectuate electrical contact with the cylincrical portion at an exterior surface of the cylincrical portion.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing aspects and other features of the present invention are explained in the following description, taken in connection with the accompanying drawings, wherein:
Fig. ] is a schematlc elevational vlew of a floor system and grounding system having a grounding connector incorporating features of the present invention;
Fig. 2 is an exploded perspective view of the ground connec:tion between the floor pedestal, the tap conductor and the grounding connector shown in Fig. 1;
Fig. :3 is a perspective view of the upper clamp part of the gr-ounding connector shown in Flg. 2;
Fig. 3A is an enlarged elevation view of area 3A of the steps formed in the upper clamp part shown in Fig. 3;
Fig. 4 is a cross-sectional view of the upper clamp part shown in Fig. 3 taken along line 4-4;
Fig. 5 is a perspective view of the lower clamp part of the g:-ounding connector shown in Fig. 2;
Fig. 6 is a cross-sectional view of the lower clamp part shown in Fig. 5 taken along line 6-6;
-Fig. 7 is a schematic elevational view of an alternate embodiment of a floor system and grounding system; and Fig. 8 is a top plan view of the grounding connector clamped to the alternate type of pedestal shown in Fig.
7.
DETAILED DESCRIPTION OE' THE PREFERRED EMBODIMENTS
Referring to Fig. 1, there is shown a schematic elevalional view of a floor system 10 and a grounding system 20 incorporating features of the present invenlion. Although the present inventlon will be described with reference to the embodiments shown in the drawings, it should be understood that the present invenlion can be embodied in various different types of grounding systems. In addition, any suitable size, shape or type of elements or materials could be used.
The floor system 10 generally comprises a foundation slab 12, a plurality of floor pedestals 14 and a plurality of struclural floor portions or tiles 16. The floor pedeslals 14 support the floor tiles 16 a spaced distance from the foundation slab 12. The grounding system 20 comprises a main grounding conductor 22, a tap conductor 24, a tap-main connector 26, and a grounding connector 28. The grounding system 20 is attached to the floor pedes-tals 14. The main conductor 22 spans between floor pedestals 14. The tap conductors 24 extends between the floor pedestals 14 and main conductor 22. The tap condu-tor 24 is mechanically and electrically connected to the main conductor 22 by the tap-main connector 26.
The lap conductor 24 is mechanically and electrically connected to the floor pedestal 14 by the grounding connector 28. Thus, the floor pedestals 14, and hence the floor system 10 is grounded by the grounding connector 28, the tap conductor 24 and the tap-main connector 26 to the main conductor 22 of the grounding system 20.
Referring also to Fig. 2, the grounding connector 28 comprises a U-bolt 30, an upper clamp part 32, a lower clamp part 34, two lockwashers 35 and two nuts 36. The upper clamp part 32 is removably connected to the U-bolt 30 to clamp a cylindrical section 214 of the floor pedest:al 14 therebetween. Clamping the upper clamp part 32 to the floor pedestal 14 electrically connects the grouncling connector 28 to the floor pedestal 14. The lower clamp part 34 is removably connected to the U-bolt 30 and the upper clamp part 32 to clamp the tap conductor 24 between the upper clamp part 32 and lower clamp part 34. Clamping the tap conductor 24 between the upper clamp part 32 and lower clamp part 34 creates an electrical connection between the conductor 24 and the grouncling connector 28. Thus, the floor pedestal 14 is electrically connected by the grounding connector 28 to the tap conductor 24.
Referring also to Figs. 3 and 3A, the upper clamp part 32 of the grounding connector 28 has an upper surface 37 with a recess 40 formed therein. The bottom surface 60 of the recess 40 is substantially flat. On each side of the recess 40, stepped surfaces 38 step upward and outward away from the recess 40 to the upper surface 37 of the upper clamp part 32. Each stepped surface 38 has a first step 41 adjoining the recess 40 and steps or teeth 42 rising between the first ,tep 41 and the upper surface 37. The steps 41, 42 of each stepped surface 38 have sharp interior edges 62, as shown in Fig. 3A. In the prefe-red embodiment, -he sharp edges 62 are subst~ntially straight ext:ending parallel to the floor pedesl-al 14 when the upper clamp part 32 is clamped thereon. In alternate embodiments, the steps may be aligned so that their sharp edges extend perpendicularly to the floor pedestal 14, when the upper clamp part 32 is clamped thereon. The sharp edges 62 of steps 41, 42 are located in a curved pattern conforming to the circumference of the cylindrical section 214 of the floor pedestal 14. In the preferred embodiment, each first step 41 has a rising portion 41A aligned generally perpendicular to the bottom surface 60 of the recess 40.
The risers 42A of the ac~joining steps 42 are aligned generally parallel to rising portion 41A and the transverse sectlons connecting the steps 42 are aligned generally perpendicular to the risers 42A so that the steps 41, 42 have a generaL right angle profile (See Fig.
3A). In alternate embodiments, the alignment of the risers and transverse sectlons of the steps may vary with respect to each other so that the steps have an obtuse angle or acute angle profile.
Referring also to Fig. 4, the upper clamp part 32 has a lower surface 100 with tw~ conductor receiving channels 102. In the preferred embodiment, the channels 102 are aligned generally perpendicular to the recess 40 in the upper surface 37. The channels 102 are located proximate the longitudinal sides 104 of the upper clamp part 32.
The conductor receiving channels 102 are separated sufficiently from each other so that when the tap conductor 24 is located in one channel 102A, and a second conductor (not shown) is located in the other channel 102B, the U-bolt 30 inserted through the bolt holes 33 in the upper clamp part 32 extends between the conductors in the channels 102A, 102B. In alternate embodiments, the number and alignment of conductor receiving channels in the upper clamp part may vary. For example, the upper clamp part may have one or more conductor receiving passageways aligned generally parallel to the recess 40 in the upper surface 37. Each longitudinal side 104A, 104B of the upper clamp part 32 has a recess 106A, 106B
exten(~ing thereinto from the lower surface 100 (see Fig.
A set number of pedestals per square area is required to be bonded using copper conductor with a range of #6 awg to 2,'0 awg. A single conductor or two conductors are attached perpendicularly to the pedestal. Currently these pedestals are being bonded with the use of the Burncy GAR1726 ground clamp connector which is attached to the bare metal surface, thus enabling an effective electrical connectlon. The removal of the paint from the 2ci pedestals is time consuming and costly for the installers of these connectors. It was desired to develop a connector that would make such removal of paint unnecessary. This connector would have some means that would penetrate the paint when installed, maklng a proper connection. The connector must meet all requirements of UL st~ndard 467 Grounding and Bonding Equipment for the intencied conductor range. The connector is also required to st~nd up to the rigors of the extreme conditions of an earthquake and still maintain electrical contact.
There may also be a need to ground rectangular unpainted raise(~ floor pedestals. No paint penetrating device would be needed for this application, only a connector that would accommodate its rectangular configuration.
SUMMARY OF THE INVENTION
The present invention provides a solution to this problem by modifying a standard GE~ type connector such that the groove that accepts the pedestal is machined creating a series of steps. The sharp edge formed by these steps contact the surface of the pedestal. ~hen the U-bolt of the c~onnector is tightened to its proper torque, these edges penetrate through the paint enabling contact with the metallic pedestal and the connector. The profile of steps can be configured such that it would also acco~Lmodate a rectangular raised floor pedestal.
The present invention comprises a cast copper alloy ground clamp that attaches to painted metallic raised floor pedestals whlch permits durlng installation, connection to stranded or solid copper conductors. The surf~ce of the groove of t:he connector, which accepts the painced metallic raised floor pedestal, has a series of machined steps that run parallel to the length of the pedestal. These steps fc,rm sharp edges. The steps are dimensioned such that when the pedestal is placed in the groove, each edge is in contact with the surface of the pedestal. When the connector is assembled, and is tightened to the required torque, these edges penetrate through the painted surface of the pedestal thereby making contact with the metallic portion of the pedestal, thus ~nabling an electrical connection with relatively low resistance.
In accordance with one embodiment of the present invention, an electrical grounding connector is provided comprising a U-bolt, an upper clamp part and a lower clamp part. The upper clamp part is connected to the U-bolt l-o clamp a floor pedestal therebetween. The lower clamp part is connected to the U-bolt to clamp a conductor between the upper and lower clamp parts. The upper clamp part has a stepped surface therein to penetrate through paint on the floor pedestal.
In accordance with another embodiment of the present invent:ion, an electrical grounding connector is provided comprising a first clamp member, means for clamping the first clamp member to a floor pedestal and conductor retaining means. The conductor retaining means mechanically and electrically connect a conductor to the first clamp member. The first clamp member has a step thereon so that, when the first clamp is clamped against the floor pedestal, the step pierces an exterior surface of the floor pedestal making electrical contact with the floor pedestal.
In accordance with stilL another embodiment of the present invention, an electrical grounding connector is provi~ed comprising a first clamp member, a fastener connector thereto and conductor retaining means. The fastener is connected to the first clamp member to clamp a floor pedestal therebetween. The conductor retaining means connect a conductor to the first clamp member. The first clamp mernber has a pair of steps forming a recess -therebetween. The recess is adapted to receive a rectangular portion of a iirst type of floor pedestal.
When t:he first clamp member is attached to a cylindrical portion of a second type oi- floor pedestal, edges of the pair of steps effectuate electrical contact with the cylincrical portion at an exterior surface of the cylincrical portion.
BRIEF DESCRIPTION OF THE DRAWINGS
The foregoing aspects and other features of the present invention are explained in the following description, taken in connection with the accompanying drawings, wherein:
Fig. ] is a schematlc elevational vlew of a floor system and grounding system having a grounding connector incorporating features of the present invention;
Fig. 2 is an exploded perspective view of the ground connec:tion between the floor pedestal, the tap conductor and the grounding connector shown in Fig. 1;
Fig. :3 is a perspective view of the upper clamp part of the gr-ounding connector shown in Flg. 2;
Fig. 3A is an enlarged elevation view of area 3A of the steps formed in the upper clamp part shown in Fig. 3;
Fig. 4 is a cross-sectional view of the upper clamp part shown in Fig. 3 taken along line 4-4;
Fig. 5 is a perspective view of the lower clamp part of the g:-ounding connector shown in Fig. 2;
Fig. 6 is a cross-sectional view of the lower clamp part shown in Fig. 5 taken along line 6-6;
-Fig. 7 is a schematic elevational view of an alternate embodiment of a floor system and grounding system; and Fig. 8 is a top plan view of the grounding connector clamped to the alternate type of pedestal shown in Fig.
7.
DETAILED DESCRIPTION OE' THE PREFERRED EMBODIMENTS
Referring to Fig. 1, there is shown a schematic elevalional view of a floor system 10 and a grounding system 20 incorporating features of the present invenlion. Although the present inventlon will be described with reference to the embodiments shown in the drawings, it should be understood that the present invenlion can be embodied in various different types of grounding systems. In addition, any suitable size, shape or type of elements or materials could be used.
The floor system 10 generally comprises a foundation slab 12, a plurality of floor pedestals 14 and a plurality of struclural floor portions or tiles 16. The floor pedeslals 14 support the floor tiles 16 a spaced distance from the foundation slab 12. The grounding system 20 comprises a main grounding conductor 22, a tap conductor 24, a tap-main connector 26, and a grounding connector 28. The grounding system 20 is attached to the floor pedes-tals 14. The main conductor 22 spans between floor pedestals 14. The tap conductors 24 extends between the floor pedestals 14 and main conductor 22. The tap condu-tor 24 is mechanically and electrically connected to the main conductor 22 by the tap-main connector 26.
The lap conductor 24 is mechanically and electrically connected to the floor pedestal 14 by the grounding connector 28. Thus, the floor pedestals 14, and hence the floor system 10 is grounded by the grounding connector 28, the tap conductor 24 and the tap-main connector 26 to the main conductor 22 of the grounding system 20.
Referring also to Fig. 2, the grounding connector 28 comprises a U-bolt 30, an upper clamp part 32, a lower clamp part 34, two lockwashers 35 and two nuts 36. The upper clamp part 32 is removably connected to the U-bolt 30 to clamp a cylindrical section 214 of the floor pedest:al 14 therebetween. Clamping the upper clamp part 32 to the floor pedestal 14 electrically connects the grouncling connector 28 to the floor pedestal 14. The lower clamp part 34 is removably connected to the U-bolt 30 and the upper clamp part 32 to clamp the tap conductor 24 between the upper clamp part 32 and lower clamp part 34. Clamping the tap conductor 24 between the upper clamp part 32 and lower clamp part 34 creates an electrical connection between the conductor 24 and the grouncling connector 28. Thus, the floor pedestal 14 is electrically connected by the grounding connector 28 to the tap conductor 24.
Referring also to Figs. 3 and 3A, the upper clamp part 32 of the grounding connector 28 has an upper surface 37 with a recess 40 formed therein. The bottom surface 60 of the recess 40 is substantially flat. On each side of the recess 40, stepped surfaces 38 step upward and outward away from the recess 40 to the upper surface 37 of the upper clamp part 32. Each stepped surface 38 has a first step 41 adjoining the recess 40 and steps or teeth 42 rising between the first ,tep 41 and the upper surface 37. The steps 41, 42 of each stepped surface 38 have sharp interior edges 62, as shown in Fig. 3A. In the prefe-red embodiment, -he sharp edges 62 are subst~ntially straight ext:ending parallel to the floor pedesl-al 14 when the upper clamp part 32 is clamped thereon. In alternate embodiments, the steps may be aligned so that their sharp edges extend perpendicularly to the floor pedestal 14, when the upper clamp part 32 is clamped thereon. The sharp edges 62 of steps 41, 42 are located in a curved pattern conforming to the circumference of the cylindrical section 214 of the floor pedestal 14. In the preferred embodiment, each first step 41 has a rising portion 41A aligned generally perpendicular to the bottom surface 60 of the recess 40.
The risers 42A of the ac~joining steps 42 are aligned generally parallel to rising portion 41A and the transverse sectlons connecting the steps 42 are aligned generally perpendicular to the risers 42A so that the steps 41, 42 have a generaL right angle profile (See Fig.
3A). In alternate embodiments, the alignment of the risers and transverse sectlons of the steps may vary with respect to each other so that the steps have an obtuse angle or acute angle profile.
Referring also to Fig. 4, the upper clamp part 32 has a lower surface 100 with tw~ conductor receiving channels 102. In the preferred embodiment, the channels 102 are aligned generally perpendicular to the recess 40 in the upper surface 37. The channels 102 are located proximate the longitudinal sides 104 of the upper clamp part 32.
The conductor receiving channels 102 are separated sufficiently from each other so that when the tap conductor 24 is located in one channel 102A, and a second conductor (not shown) is located in the other channel 102B, the U-bolt 30 inserted through the bolt holes 33 in the upper clamp part 32 extends between the conductors in the channels 102A, 102B. In alternate embodiments, the number and alignment of conductor receiving channels in the upper clamp part may vary. For example, the upper clamp part may have one or more conductor receiving passageways aligned generally parallel to the recess 40 in the upper surface 37. Each longitudinal side 104A, 104B of the upper clamp part 32 has a recess 106A, 106B
exten(~ing thereinto from the lower surface 100 (see Fig.
3). Each recess 106A, 106B communicates with the conductor receiving channel 102A, 102B proximate the corresponding sides 104A, 104B of the upper clamp part 32. The lower surface 100 has a key section 110 projecting therefrom between the conductor receiving channels 102A, 102B.
Referring now to Figs. 5 and 6, the lower clamp part 34 has an upper surface 70 with a keyway 72 formed therein.
The keyway 72 is adapted to receive the keyed section 110 of the upper clamp part 32 when it is mated to the lower clamp part 34. The lower clamp part 34 has two conductor recei~Jing channels 74A, 74B longitudinally astride the keyway 72. The conductor r-eceiving channels 74A, 74B are located in the lower clamp part 34 to generally align with the corresponding concluctor receiving channels 102A, 102B in the upper clamp par-t 32, when the key section 110 of the upper clamp part 32 is located in the keyway 72.
Outer side supports 76A, 76B extend upward from each longitudinal side 78A, 78B of the lower clamp part 34.
The outer supports 76A, 76E3 are adapted to be admitted in the corresponding slde recesses 106A, 106B of the upper clamp part 32, when the upper clamp part 32 and the lower clamp part 34 are joined.
Referring now to Fig. 2, the ground connection between the ~-loor pedestal 14 and the ground conductor 24 is established by clamping the grounding connector 28 on the floor pedestal 14 and connecting the conductor 24 to the connector 28. The grounding connector 28 lS clamped on the cylindrical section 214 of the floor pedestal 14.
The upper clamp part 32 of the connector 28 is placed against the cylindrical section 214, so that the sharp edges 62, of the steps 41, 42 of each stepped surface 38 contact the floor pedestal 14. The U-bolt 30 is posit:ioned around the cylindrical section 214 and inserted into the bolt holes 33 of the upper clamp part 32 to capture the floor pedestal 14 between the U-bolt 30 and t:he upper clamp part :32. The connection between the tap conductor 24 and the connector 28 is formed by clamping the conductor 24 between the upper clamp part 32 and t:he lower clamp part :34. The conductor 24 is placed in one of the conductor receiving channels 102A, 102B in the lpper clamp part 32. The lower clamp part 34 is matec~ to the upper clamp part 32 capturing the conductor 24 therebetween. When th.e upper clamp part 32 and the lower clamp part 34 are mated, the key section 110 of the upper part 32 is located in the keyway 72 in the lower part 34. Thus, the respective conductor receiving chanr.els 74A, 74B ln the lower clamp part 34 are generally aligned with the conductor receiving channels 102A, 102B in the upper clamp part 32, so that the corresponding conductor receiving channel 74A, 74B in the lower clamp part 34 cooperates with the conductor recei.ving channel 102A, 102B in the upper clamp part 32 wherein the conductor 24 is located to hold the conductor 24. The U-bolt 30 is inserted through holes 160 in the lower clamp part 34. The lock washers 35 are placed on the U-bolt 30 and the nuts 36 are threaded on. Threading the nuts 36 on the U-bolt 30 urges the lower clamp part 34 a(~ainst the upper clamp part 32, and thus clamps the tap conductor 24 between l-he two clamp parts. The upper surface 70 of the lower c:lamp part 34 seats against the lower surface 100 of the upper clamp part 32 so that the lower. clamp part 34 may directly press upon the upper clamp part 32 while maintaining sufficient but limited clamping pressure on the tap conductor 24, in the conductor receiving channels 102A, 102B, to prevent excessive damage to the conductor 24. As the upper clamp part 32 and the lower clamp part 34 are drawn together, the side supports 76A, 76B on the lower clamp part 34 enter the recesses 106A, 106B in the upper clamp part 32, one of the side supports 76A, 76B contacting the conductor 24 in the conductor receiving channel 102A, 102B. The contacting support 76A, 76B laterally guides the conductor 24 as it is clamped between the upper clamp part 32 and lower clamp part 34. This ensures that the conductor 24 does not deform and exit the conductor recei~ing channels. Clamping the conductor 24 between the upper clamp part 32 and lower clamp part 34 creates the electrical and mechanical connection between the connector 28 and conductor 24.
The pressure transmitted by the lower clamp part 34 on the upper clamp part 32 as the nuts 36 are threaded on the U-bolt 30 presses the upper clamp part 32 into the cylindrical portion 214 of the floor pedestal 14 and correspondingly draws the IJ-bolt 30 into the upper clamp part 32 generating clamping forces on the cylindrical portion 214. Under these clamping forces, the sharp edges 62 of the steps 41, 42 are driven through the exterior surface and into the metal substrate of the floor pedestal 14 electrically and mechanically connecting the grounding connector 28 to the pedestal 14.
Referring now to Fig. 7, an alternate embodiment of the floor system 50 is shown. The floor system 50 is subst ntially the same as the floor system 10 shown in Fig. 1. However, floor pedestals 14 have been replaced with floor pedestal 54. Referring also to Fig. 8, the floor pedestals 54 have a main shaft 56 with a rectangular cross-section. The floor system 50 is grounded to grounding system 20 in substantially the same manner as floor system 10 is grounded to grounding system (see Fig. 1). The difference is that the main conductor 22 in this embodiment is located proximate to or in the foundation slab 12. The floor pedestals are electrically connected to t:he tap conductor 24, and hence to the grounding system 20, by the grounding connector 28. The rectangular main shaft 56 is received in the reces, 40 of the upper clamp part 32. The U-bolt 30 is connected to the upper clamp part 32 to clamp the grounding connector 28 to the floor pedestal 54. The exterior of the rectangular main shaft 56 is not painted so that clamping the grounding connector 28 thereon electrically connects the pedestal 54 to the connector 28.
The present invention provides a grounding connector 28 that, when installed on the cylindrical section 214 of floor pedestal 14, effects an electrical connection between the floor pedestal 14 and connector 28 without prior preparation of the surface of the pedestal 14.
The exterior surface of peciestal 14 may be painted. When grounding the floor pedestal 14 with connectors known in the art, the paint had to be removed in order to provide clean contact surfaces. In contrast, the present inven-ion allows the user to ground the floor pedestal 14 by merely clamping the grounding connector 28 to the floor pedestal 14. Prior removal of the paint from the pedestal 14 lS no longer required. This is because, when the connector 28 is clamped on, the sharp edges 62 of the steps 41, 42 on the upper clamp part 32 penetrate through the painted surface into the metal of the pedestal 14 effecting the electrical connection. The present invention also provides a grounding connector 28 that forms a positive mechanical connection when clamped to the cylindrical section 214 of floor pedestal 14 to withstand the rigors of the extreme vibrations of an earthquake and still maintain electrical contact. The steps 41, 42 of the connector 28 penetrate into and engage the metal of the iloor pedestal 14 to form the positive mechanical connection which overcomes the limitation of present grounding connectors that rely on friction to maintain the electrical connection. The vibral-ions generated during a seismic event adversely impact frictional connections, thus severely degrading the electrical connection of these connectors. However, seismic vibrations have negligible effect on a positive mechanical connection, and hence the electrical connection between the floor pedestal 14 and the connectors 28 of the present invention is maintained under such vibrations. Finally, the present invention provi(~es a single grounding connector 28 capable of being mechanically and electrically connected to either a floor pedestal 14 with a cylindrical sectlon 214, or to a floor pedestal 54 with a rectangular main shaft 56.
Consequently, the user no longer need carry with him two types of grounding connectors, one for grounding structure with a rectangular cross-section and another for grounding structure with a cylindrical cross-section.
It should be understood thc~t the foregoing description is only illustrative of the invention. Various alternative and m~difications can be devised by those skilled in the art without departing from the scope of the invention.
Accordingly, the present invention is intended to embrace all such alternative, mod'fications and variances which fall within the scope of the appended claims.
Referring now to Figs. 5 and 6, the lower clamp part 34 has an upper surface 70 with a keyway 72 formed therein.
The keyway 72 is adapted to receive the keyed section 110 of the upper clamp part 32 when it is mated to the lower clamp part 34. The lower clamp part 34 has two conductor recei~Jing channels 74A, 74B longitudinally astride the keyway 72. The conductor r-eceiving channels 74A, 74B are located in the lower clamp part 34 to generally align with the corresponding concluctor receiving channels 102A, 102B in the upper clamp par-t 32, when the key section 110 of the upper clamp part 32 is located in the keyway 72.
Outer side supports 76A, 76B extend upward from each longitudinal side 78A, 78B of the lower clamp part 34.
The outer supports 76A, 76E3 are adapted to be admitted in the corresponding slde recesses 106A, 106B of the upper clamp part 32, when the upper clamp part 32 and the lower clamp part 34 are joined.
Referring now to Fig. 2, the ground connection between the ~-loor pedestal 14 and the ground conductor 24 is established by clamping the grounding connector 28 on the floor pedestal 14 and connecting the conductor 24 to the connector 28. The grounding connector 28 lS clamped on the cylindrical section 214 of the floor pedestal 14.
The upper clamp part 32 of the connector 28 is placed against the cylindrical section 214, so that the sharp edges 62, of the steps 41, 42 of each stepped surface 38 contact the floor pedestal 14. The U-bolt 30 is posit:ioned around the cylindrical section 214 and inserted into the bolt holes 33 of the upper clamp part 32 to capture the floor pedestal 14 between the U-bolt 30 and t:he upper clamp part :32. The connection between the tap conductor 24 and the connector 28 is formed by clamping the conductor 24 between the upper clamp part 32 and t:he lower clamp part :34. The conductor 24 is placed in one of the conductor receiving channels 102A, 102B in the lpper clamp part 32. The lower clamp part 34 is matec~ to the upper clamp part 32 capturing the conductor 24 therebetween. When th.e upper clamp part 32 and the lower clamp part 34 are mated, the key section 110 of the upper part 32 is located in the keyway 72 in the lower part 34. Thus, the respective conductor receiving chanr.els 74A, 74B ln the lower clamp part 34 are generally aligned with the conductor receiving channels 102A, 102B in the upper clamp part 32, so that the corresponding conductor receiving channel 74A, 74B in the lower clamp part 34 cooperates with the conductor recei.ving channel 102A, 102B in the upper clamp part 32 wherein the conductor 24 is located to hold the conductor 24. The U-bolt 30 is inserted through holes 160 in the lower clamp part 34. The lock washers 35 are placed on the U-bolt 30 and the nuts 36 are threaded on. Threading the nuts 36 on the U-bolt 30 urges the lower clamp part 34 a(~ainst the upper clamp part 32, and thus clamps the tap conductor 24 between l-he two clamp parts. The upper surface 70 of the lower c:lamp part 34 seats against the lower surface 100 of the upper clamp part 32 so that the lower. clamp part 34 may directly press upon the upper clamp part 32 while maintaining sufficient but limited clamping pressure on the tap conductor 24, in the conductor receiving channels 102A, 102B, to prevent excessive damage to the conductor 24. As the upper clamp part 32 and the lower clamp part 34 are drawn together, the side supports 76A, 76B on the lower clamp part 34 enter the recesses 106A, 106B in the upper clamp part 32, one of the side supports 76A, 76B contacting the conductor 24 in the conductor receiving channel 102A, 102B. The contacting support 76A, 76B laterally guides the conductor 24 as it is clamped between the upper clamp part 32 and lower clamp part 34. This ensures that the conductor 24 does not deform and exit the conductor recei~ing channels. Clamping the conductor 24 between the upper clamp part 32 and lower clamp part 34 creates the electrical and mechanical connection between the connector 28 and conductor 24.
The pressure transmitted by the lower clamp part 34 on the upper clamp part 32 as the nuts 36 are threaded on the U-bolt 30 presses the upper clamp part 32 into the cylindrical portion 214 of the floor pedestal 14 and correspondingly draws the IJ-bolt 30 into the upper clamp part 32 generating clamping forces on the cylindrical portion 214. Under these clamping forces, the sharp edges 62 of the steps 41, 42 are driven through the exterior surface and into the metal substrate of the floor pedestal 14 electrically and mechanically connecting the grounding connector 28 to the pedestal 14.
Referring now to Fig. 7, an alternate embodiment of the floor system 50 is shown. The floor system 50 is subst ntially the same as the floor system 10 shown in Fig. 1. However, floor pedestals 14 have been replaced with floor pedestal 54. Referring also to Fig. 8, the floor pedestals 54 have a main shaft 56 with a rectangular cross-section. The floor system 50 is grounded to grounding system 20 in substantially the same manner as floor system 10 is grounded to grounding system (see Fig. 1). The difference is that the main conductor 22 in this embodiment is located proximate to or in the foundation slab 12. The floor pedestals are electrically connected to t:he tap conductor 24, and hence to the grounding system 20, by the grounding connector 28. The rectangular main shaft 56 is received in the reces, 40 of the upper clamp part 32. The U-bolt 30 is connected to the upper clamp part 32 to clamp the grounding connector 28 to the floor pedestal 54. The exterior of the rectangular main shaft 56 is not painted so that clamping the grounding connector 28 thereon electrically connects the pedestal 54 to the connector 28.
The present invention provides a grounding connector 28 that, when installed on the cylindrical section 214 of floor pedestal 14, effects an electrical connection between the floor pedestal 14 and connector 28 without prior preparation of the surface of the pedestal 14.
The exterior surface of peciestal 14 may be painted. When grounding the floor pedestal 14 with connectors known in the art, the paint had to be removed in order to provide clean contact surfaces. In contrast, the present inven-ion allows the user to ground the floor pedestal 14 by merely clamping the grounding connector 28 to the floor pedestal 14. Prior removal of the paint from the pedestal 14 lS no longer required. This is because, when the connector 28 is clamped on, the sharp edges 62 of the steps 41, 42 on the upper clamp part 32 penetrate through the painted surface into the metal of the pedestal 14 effecting the electrical connection. The present invention also provides a grounding connector 28 that forms a positive mechanical connection when clamped to the cylindrical section 214 of floor pedestal 14 to withstand the rigors of the extreme vibrations of an earthquake and still maintain electrical contact. The steps 41, 42 of the connector 28 penetrate into and engage the metal of the iloor pedestal 14 to form the positive mechanical connection which overcomes the limitation of present grounding connectors that rely on friction to maintain the electrical connection. The vibral-ions generated during a seismic event adversely impact frictional connections, thus severely degrading the electrical connection of these connectors. However, seismic vibrations have negligible effect on a positive mechanical connection, and hence the electrical connection between the floor pedestal 14 and the connectors 28 of the present invention is maintained under such vibrations. Finally, the present invention provi(~es a single grounding connector 28 capable of being mechanically and electrically connected to either a floor pedestal 14 with a cylindrical sectlon 214, or to a floor pedestal 54 with a rectangular main shaft 56.
Consequently, the user no longer need carry with him two types of grounding connectors, one for grounding structure with a rectangular cross-section and another for grounding structure with a cylindrical cross-section.
It should be understood thc~t the foregoing description is only illustrative of the invention. Various alternative and m~difications can be devised by those skilled in the art without departing from the scope of the invention.
Accordingly, the present invention is intended to embrace all such alternative, mod'fications and variances which fall within the scope of the appended claims.
Claims (18)
1. An electrical grounding connector comprising:
a U-bolt;
an upper clamp part connected to the U-bolt to clamp a floor pedestal therebetween; and a lower clamp part connected to the U-bolt to clamp a conductor between the upper and lower clamp parts, wherein the upper clamp part has a stepped surface therein to penetrate through paint on the floor pedestal.
a U-bolt;
an upper clamp part connected to the U-bolt to clamp a floor pedestal therebetween; and a lower clamp part connected to the U-bolt to clamp a conductor between the upper and lower clamp parts, wherein the upper clamp part has a stepped surface therein to penetrate through paint on the floor pedestal.
2. An electrical grounding connector as in claim 1, wherein the upper clamp part has two of the stepped surfaces to penetrate through paint on the floor pedestal.
3. An electrical grounding connector as in claim 1, wherein edges on the stepped surface are aligned generally parallel to a longitudinal axis of the floor pedestal, when the floor pedestal is clamped between the U-bolt and upper clamp part.
4. An electrical grounding connector as in claim 2, wherein a first one of the two stepped surfaces is separated from a second one of the two stepped surfaces to form a recess therebetween.
5. An electrical grounding connector as in claim 4, wherein when the upper clamp part is clamped to the pedestal, a portion of a cylindrical section of the floor pedestal is located between the two stepped surfaces, so that edges on the first stepped surface contact the portion of the cylindrical section and edges on the second stepped surface contact the portion of the cylindrical section generally opposite the edges on the first stepped surface.
6. An electrical grounding connector as in claim 1, wherein the upper clamp part has a lower surface with a conductor receiving channel formed therein for locating a portion of the conductor therein when the conductor is clamped between the upper clamp part and the lower clamp part.
7. An electrical grounding connector as in claim 6, wherein the upper clamp part has two of the conductor receiving channels aligned generally parallel to a longitudinal axis of the upper clamp part and located, so that, when a conductor is received in each one of the conductor receiving channels, the U-bolt passes between the conductors.
8. An electrical grounding connector as in Claim 7, wherein the upper clamp part has two longitudinal sides exterior to the two conductor receiving channels, each one of the longitudinal sides having a recess extending thereinto from the lower surface of the upper clamp part, and wherein the recess in each one of the longitudinal sides communicates with the corresponding conductor receiving channel.
9. An electrical grounding connector as in claim 8, wherein the lower clamp part has an upper surface with conductor lateral supports extending upward therefrom, so that, when the two conductors are clamped between the upper clamp part and lower clamp part, the conductor lateral supports laterally support a portion of each of the two conductors outside the conductor receiving channels.
10. An electrical grounding connector as in claim 9, wherein the conductor lateral supports on the lower clamp part are adapted to be admitted within the corresponding recesses in the longitudinal sides of the upper clamp part.
11. An electrical grounding connector comprising:
a first clamp member;
means for clamping the first clamp member to a floor pedestal; and conductor retaining means for mechanically and electrically connecting a conductor to the first clamp member;
wherein the first clamp member has a step thereon so that, when the first clamp member is clamped against the floor pedestal, the step pierces an exterior surface of the floor pedestal making electrical contact with the floor pedestal.
a first clamp member;
means for clamping the first clamp member to a floor pedestal; and conductor retaining means for mechanically and electrically connecting a conductor to the first clamp member;
wherein the first clamp member has a step thereon so that, when the first clamp member is clamped against the floor pedestal, the step pierces an exterior surface of the floor pedestal making electrical contact with the floor pedestal.
12. An electrical grounding connector as in claim 11, wherein the first clamp member has a plurality of the steps forming a first stepped surface and a second stepped surface with a recess therebetween.
13. An electrical grounding connector as in claim 12, wherein the first stepped surface and the second stepped surface have edges contacting the floor pedestal when the first clamp member is clamped to the floor pedestal, the edges being aligned generally parallel to a longitudinal axis of the floor pedestal.
14. An electrical grounding connector comprising:
a first clamp member;
a fastener connected to the first clamp member to clamp a floor pedestal therebetween; and conductor retaining means for connecting a conductor to the first clamp member;
wherein the first clamp member has a pair of steps forming a recess therebetween, the recess being adapted to receive a rectangular portion of a first type of floor pedestal, wherein, when the first clamp member is attached to a cylindrical portion of a second type of floor pedestal, edges of the pair of steps effectuate electrical contact with the cylindrical portion at an exterior surface of the cylindrical portion.
a first clamp member;
a fastener connected to the first clamp member to clamp a floor pedestal therebetween; and conductor retaining means for connecting a conductor to the first clamp member;
wherein the first clamp member has a pair of steps forming a recess therebetween, the recess being adapted to receive a rectangular portion of a first type of floor pedestal, wherein, when the first clamp member is attached to a cylindrical portion of a second type of floor pedestal, edges of the pair of steps effectuate electrical contact with the cylindrical portion at an exterior surface of the cylindrical portion.
15. An electrical grounding connector as in claim 14, wherein the first clamp member has a pair of stepped surfaces on opposite sides of the recess, each stepped surface comprising one of the pair of steps forming the recess.
16. An electrical grounding connector as in claim 15, wherein the pair of stepped surfaces have outer edges contacting the cylindrical portion of the second type of floor pedestal, when the second type of floor pedestal is clamped between the first clamp member and the fastener.
17. An electrical grounding connector as in claim 15, wherein each stepped surface from the pair of stepped surfaces is stepped upward and outward from the recess.
18. An electrical grounding connector as in claim 14, wherein the recess is generally centered on the first clamp member.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4049897P | 1997-03-10 | 1997-03-10 | |
| US60/040,498 | 1997-03-10 | ||
| US92120697A | 1997-08-27 | 1997-08-27 | |
| US08/921,206 | 1997-08-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2228669A1 true CA2228669A1 (en) | 1998-09-10 |
Family
ID=26717112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2228669 Abandoned CA2228669A1 (en) | 1997-03-10 | 1998-02-03 | Paint penetrating ground clamp for painted raised floor pedestals |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0871244A3 (en) |
| CA (1) | CA2228669A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7703722B2 (en) | 2007-03-08 | 2010-04-27 | Panduit Corp. | Common bonding network clamp |
| US7708234B2 (en) | 2007-03-08 | 2010-05-04 | Panduit Corp. | Common bonding network clamp |
| CN104362445A (en) * | 2014-11-26 | 2015-02-18 | 永固集团股份有限公司 | Vertical splicing and splitting wire clamp |
| US11205864B2 (en) | 2019-08-15 | 2021-12-21 | Panduit Corp. | Grounding pipe clamp |
| WO2022066520A1 (en) * | 2020-09-25 | 2022-03-31 | Hubbell Incorporated | Grate grounding device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1981343A (en) * | 1933-07-08 | 1934-11-20 | Stephen W Borden | Ground fittings |
| US2156965A (en) * | 1937-09-13 | 1939-05-02 | Stephen W Borden | Ground fitting |
| US2533897A (en) * | 1946-05-10 | 1950-12-12 | Morris D Reddock | Ground clamp |
| US3901577A (en) * | 1974-01-25 | 1975-08-26 | Gen Signal Corp | Grounding clamps and connectors therefor |
| US4405828A (en) * | 1982-03-31 | 1983-09-20 | Insulating Breaking Clamp, Inc. | Breaking and insulating clamp for electrical conductors |
| GB2120310B (en) * | 1982-05-18 | 1985-11-06 | Stromberg Greest Ltd | Aerial clamp |
-
1998
- 1998-02-03 CA CA 2228669 patent/CA2228669A1/en not_active Abandoned
- 1998-03-04 EP EP98870044A patent/EP0871244A3/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0871244A3 (en) | 1999-12-08 |
| EP0871244A2 (en) | 1998-10-14 |
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Legal Events
| Date | Code | Title | Description |
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| FZDE | Dead |