US20180291566A1 - Electrically-grounded work platform - Google Patents
Electrically-grounded work platform Download PDFInfo
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- US20180291566A1 US20180291566A1 US16/001,610 US201816001610A US2018291566A1 US 20180291566 A1 US20180291566 A1 US 20180291566A1 US 201816001610 A US201816001610 A US 201816001610A US 2018291566 A1 US2018291566 A1 US 2018291566A1
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- 239000004020 conductor Substances 0.000 description 6
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- 230000000295 complement effect Effects 0.000 description 3
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- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009429 electrical wiring Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/08—Temporary pavings
- E01C9/083—Temporary pavings made of metal, e.g. plates, network
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/001—Pavings made of prefabricated single units on prefabricated supporting structures or prefabricated foundation elements except coverings made of layers of similar elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/003—Pavings made of prefabricated single units characterised by material or composition used for beds or joints; characterised by the way of laying
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/16—Pavings made of prefabricated single units made of metallic units
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/22—Pavings made of prefabricated single units made of units composed of a mixture of materials covered by two or more of groups E01C5/008, E01C5/02 - E01C5/20 except embedded reinforcing materials
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C5/00—Pavings made of prefabricated single units
- E01C5/22—Pavings made of prefabricated single units made of units composed of a mixture of materials covered by two or more of groups E01C5/008, E01C5/02 - E01C5/20 except embedded reinforcing materials
- E01C5/223—Pavings made of prefabricated single units made of units composed of a mixture of materials covered by two or more of groups E01C5/008, E01C5/02 - E01C5/20 except embedded reinforcing materials on prefabricated supporting or prefabricated foundation units, except coverings made of layers of similar elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/08—Temporary pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/08—Temporary pavings
- E01C9/086—Temporary pavings made of concrete, wood, bitumen, rubber or synthetic material or a combination thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/002—Auxiliary arrangements
-
- 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
-
- 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
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C2201/00—Paving elements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C2201/00—Paving elements
- E01C2201/16—Elements joined together
Definitions
- This disclosure generally relates to timber access mats and, more particularly, to timber access mats with integrated grounding features. Specifically, the disclosure relates to grounding devices that can be added to and then removed from traditional timber access mats to allow the mats to be used when electrical grounding is necessary.
- Timber access mats which are also known as rig mats, rig pads and road mats, are used to provide support for vehicles on soft ground where paved roads are not present.
- Timber access mats reduce damage to softer ground and prevent motor vehicles from becoming stuck in the softer ground.
- Conventional mats are constructed as generally rectangular wood platforms formed by overlapping wooden beams in alternating directions. Three layers of typical 2 ⁇ 6 or 2 ⁇ 8 lumber can be used to form the mats.
- the body members also may be formed from polymer body members or other non-conducting materials. These mats work well when simply used to provide vehicle access and to protect the softer ground. These mats are used for high voltage line maintenance where the high voltage lines cut across the countryside. However, vehicles providing access to high voltage electrical wiring must be grounded. Grounding vehicles supported by timber access mats has created problems. There is also a problem with providing proper grounding to workers standing on the mats.
- the disclosure provides timber access mats with electrical conductors disposed at the support surface to provide electrical grounding to the mat.
- the electrical conductors are provided in different forms.
- the conductors are parallel and disposed slightly above the upper surface of the body members of the mat. These parallel connectors are joined about the perimeter of the mat by a frame.
- Another configuration uses a mesh screen or web disposed over the top of the body members of the mat. The screen or web is connected to a frame or it can be wrapped around the edges of the mat. An optional filler such as a polymer or rubber may be disposed in the openings of the screen or web.
- the screen or web can be formed from flexible wires or a more rigid material such as sheets of expanded metal such as steel.
- Another configuration uses a thin sheet of conductive material disposed over the top of the body members of the mat. The thin sheet may be perforated or expanded to define openings. The sheet can be joined to the perimeter frame or its own perimeter frame.
- the perimeter frame and metal conductive layer can be added over the top of traditional wooden-body or polymer-body timber access mats when electrical grounding is required and then removed and stored when grounding is not required.
- the mats include electrical links that are used to electrically connect one mat to another such that each and every mat does not have to be individually pinned to the ground. This is beneficial when a platform is assembled from a plurality of mats.
- the electrical links can be wires such as steel cable leads.
- the steel cable leads can be located at each corner and across the width or length of the mat. A pair of leads can extend from each corner to connect other mats. Any of these cable leads can be pinned to the ground.
- Another configuration of the timber access mat includes a frame configuration with electrical connector tabs that are offset on opposite sides of the mat frame so that a plurality of mats can be arranged in an abutting array to form a multiple mat platform.
- the opposed edges of each mat complement each other to allow the edges to abut without connector tabs interfering with each other.
- the connector tabs allow electrical link cables to be attached from the top of the platform without requiring access to the bottom of the connector tab. This allows the mats to be connected and disconnected from above with a simple tool like a nut driver or a socket wrench.
- Another configuration of the timber access mat includes cable guides disposed in tandem with the connector tab to manage the location of the grounding cable and/or the electrical link cable leads.
- the cable guides protect the cable from damage by preventing pinching between mats and preventing the cable leads from dropping down and being trapped under the mats.
- FIG. 1 depicts a top view of one configuration of the grounded timber access mat.
- FIG. 2 is a perspective view of the FIG. 1 configuration.
- FIG. 3 is a top view of a second configuration the grounded timber access mat.
- FIG. 4 is a top plan view of a four timber access mats arranged in an array.
- FIG. 5 is a top plan view of a single grounded timber access mat according to the third configuration.
- FIG. 6 is a side view taken along line 6 - 6 of FIG. 5 .
- a timber access mat 2 includes a plurality of non-conductive mat body members 4 disposed within a metal perimeter frame 6 disposed around the outside of the combined body members 4 .
- Metal grounding slats 8 are disposed between or on top of body members 4 .
- the ends of each metal grounding slat 8 are connected to perimeter frame 6 .
- the ends can abut frame 6 , rest on top of frame 6 , or be disposed under frame 6 .
- Each metal grounding slat 8 extends at least slightly above the upper surface of body members 4 so that a vehicle, a person, or other equipment supported by mat 2 will be in contact with at least one metal grounding slat 8 .
- each metal grounding slat 8 can extend about a quarter inch above the upper surface of body members 4 .
- Slats 8 can be a quarter inch by a quarter inch metal strips disposed on top of body members 4 .
- body members 4 are traditional 2 ⁇ 4, 2 ⁇ 6, or 2 ⁇ 8 lumber, there can be multiple metal grounding slats 8 disposed on each body member 4 . Limiting the distance between metal grounding slats 8 provides that a person or a vehicle will be in contact with at least one of metal grounding slats 8 when the person or vehicle is supported by timber access mat 2 .
- a distance of four to six inches from edge to edge between adjacent metal grounding slats 8 is disclosed.
- Cross slats (not shown) can be used to increase the coverage of the conductive grounding members.
- the cross slats can be perpendicular to slats 8 .
- Each of metal grounding slats 8 can be disposed one quarter of an inch above the upper surface of body members 4 .
- Metal grounding slats 8 can be friction fit to frame 6 , bolted or riveted to frame 6 , or welded to frame 6 .
- An alternative configuration uses a filler material or a filler strip disposed between slats 8 to provide a flat surface to mat 2 .
- Cable leads 10 are connected to frame 6 .
- Cable leads 10 can be located near the corners of frame 6 .
- a pair or a plurality of cable leads 10 can extend from each location.
- Cable leads 10 are used to connect mats 2 or connect mat 2 to a grounding pin that is driven into the ground.
- Cable leads 10 can be bolted to frame 6 but also can be welded to frame 6 .
- Each cable lead 10 can carry a bolt receiver at its loose end for receiving a bolt that is used to secure cable lead 10 to another mat 2 or to the grounding pin.
- FIGS. 3-6 are similar to the above configuration and the same reference numerals are used to identify similar elements.
- these mat configurations use a conductive cover layer 12 that is in the form of a mesh or conductive screen made of electrically conductive material such as steel.
- Another configuration uses a thin perforated metal foil as the conductive cover layer 12 .
- One or a plurality of expanded metal sheets can be used over the body of the mat as conductive cover layer 12 .
- An advantage to using the mesh, screen, or expanded metal is that the size of the gaps between conductive elements is small and a person standing on mat 2 is guaranteed to be in contact with multiple locations of layer 12 .
- Conductive cover layer 12 can be bolted or welded to frame 6 .
- Conductive cover layer 12 also can be wrapped around the sides of frame 6 and bolted to the sides or bottom of frame 6 .
- each sheet of expanded metal can be lag bolted down into the body members of the mat with washers cooperating with the bolt heads to grip the expanded metal sheet.
- the lag bolts and washers allow the expanded metal layer 12 and frame 6 to be to and removed from the body members 4 . This allows existing non-grounding timber access mats to be converted to grounding mats as needed.
- the edges of adjacent expanded metal sheets 12 are overlapped and either secured with bolts or welds or left loose.
- the expanded metal sheets 12 are welded or bolted to frame 6 .
- An upper leg of frame 6 extends over an upper perimeter portion of the body with the edges of the expanded metal sheets disposed under the upper leg of frame 6 .
- Another leg of frame 6 extends down the side of the body of the mat.
- the two legs cooperate to define an L-shaped cross section such that frame 6 sits over and surrounds the upper corners of the mat body.
- the upper leg of frame 6 is secured with connectors such as lag bolts directly down into the body members of the mat.
- the grounding pin 18 is connected to frame 6 with a flexible cable 10 .
- the flexible cable is connected at a raised U or C-shaped cleat that allows a tight bolted connection to be made between the flexible cable 10 and the frame 6 .
- a plurality of flexible cables 10 can extend from a single cleat. The flexible cables 10 allow multiple mats to be electrically connected to a single grounding pin 18 .
- FIG. 3 also discloses the use of flexible connectors 14 disposed under cover 12 and between body members 4 to directly connect the different locations where cable leads 10 are secured to frame 6 in order to provide for direct cabled electrical contact between these locations.
- Connectors 14 may be disposed between body members 4 and lower than the upper surface of body members 4 .
- Connectors 14 can be directly connected to the inside of frame 6 or wrapped under the lower edge of frame 6 and connected to the cleats the receive cable leads 10 .
- a filler material can be used to fill the openings defined by the material of cover 12 .
- the filler can be a rubber or polymer material that is sprayed onto the top of mat 2 in an amount thin enough to leave the upper surfaces of cover 12 exposed.
- a timber access mat 20 includes a plurality of body members 4 disposed within a metal perimeter frame 6 .
- Frame 6 includes four upper, generally horizontal, frame members disposed over the outer upper perimeter portions of the timber access mat body.
- Frame 6 also includes vertical frame members extending down from the outer edges of the upper frame members such that they are disposed outwardly or against the outside edges of the timber access mat body.
- Conductive cover layer 12 such as a sheet or multiple sheets of expanded metal are disposed over the top of body members 4 with the perimeter edges of the expanded metal sheets disposed under the upper frame members of frame 6 as depicted in FIG. 4 .
- the conductive cover layer 12 can be welded to frame 6 .
- bolts 22 may be used to secure the perimeter edge of conductive cover layer 12 to frame 6 . In some configurations, bolts 22 do not extend into body members 4 . In other configurations, bolts 22 are lag bolts that extend through frame 6 , through conductive cover layer 12 , and into body members 4 to removably secure the assembly together.
- Bolt and washer combinations 24 can be used to connect the expanded metal sheets to body members 4 . The washers can be integrated with bolts or provided as separate articles. Bolts 22 and 24 can be removed to allow frame 6 and cover layer 12 to be removed from body members 4 .
- a plurality of connector tabs 30 extend from the vertical walls 32 of frame 6 .
- Connector tabs 30 extend generally horizontal from vertical walls 32 .
- Connector tabs 30 can be formed by welding or securing with mechanical connectors L-shaped lengths of metal to the outer side surfaces of frame 6 .
- Connector tabs 30 are arranged in complementary positions on opposite walls of frame 6 such that mats 20 can be arranged side-by-side without connector tabs 30 interfering with each other.
- FIG. 5 shows how connector tabs 30 are offset so they interlock and FIG. 4 depicts how these positions complement each other.
- Connector tabs 30 may directly abut the other frame 6 or cable guides 34 may directly abut the other frame or both can be the same width and function to space the adjacent frame members and prevent the crushing of cable leads 10 .
- Each cable guide 34 is a loop sized to receive cable leads 10 . Threading cable leads 10 through cable guide 34 helps prevent cable lead 10 from being pinched between adjacent mats 20 and prevents cable from falling down below the mats.
- each cable lead 10 is secured to connector tab 30 with a pair of bolts 36 that position the end of cable lead 10 parallel (and substantially horizontal) to the wall of frame 6 from which connector tab 30 extends. This keeps the ends of cable leads 10 out of the way when mats 20 are disposed edge-to-edge.
- Each connector tab can define space for multiple cable lead ends.
- Bolts 36 can be threaded into threaded openings 38 ( FIG. 6 ) or into threaded nuts (optional) 40 welded to the bottom of connector tab 30 . This configuration allows bolts 36 to be secured when mats 20 are disposed edge-to-edge as shown in FIG. 4 .
- Cable leads 10 are used to electrically connect mats 20 . Cable leads 10 also are used to connect a grounding pin to mat 20 .
- the metal frame 6 and conductive cover layer 12 can be galvanized.
Abstract
Description
- This application is a continuation application claiming priority to U.S. patent application Ser. No. 15/280,478 filed Sep. 29, 2016, which is a continuation application claiming priority to U.S. Pat. No. 9,458,578 issued on Oct. 4, 2016, which claims the benefit of U.S. Provisional Patent application Nos. 62/077,014 filed Nov. 7, 2014, 62/080,343 filed Nov. 16, 2014, and 62/092,088 filed Dec. 15, 2014; the disclosures of each are incorporated herein by reference.
- This disclosure generally relates to timber access mats and, more particularly, to timber access mats with integrated grounding features. Specifically, the disclosure relates to grounding devices that can be added to and then removed from traditional timber access mats to allow the mats to be used when electrical grounding is necessary.
- Timber access mats, which are also known as rig mats, rig pads and road mats, are used to provide support for vehicles on soft ground where paved roads are not present. Timber access mats reduce damage to softer ground and prevent motor vehicles from becoming stuck in the softer ground. Conventional mats are constructed as generally rectangular wood platforms formed by overlapping wooden beams in alternating directions. Three layers of typical 2×6 or 2×8 lumber can be used to form the mats. The body members also may be formed from polymer body members or other non-conducting materials. These mats work well when simply used to provide vehicle access and to protect the softer ground. These mats are used for high voltage line maintenance where the high voltage lines cut across the countryside. However, vehicles providing access to high voltage electrical wiring must be grounded. Grounding vehicles supported by timber access mats has created problems. There is also a problem with providing proper grounding to workers standing on the mats.
- The disclosure provides timber access mats with electrical conductors disposed at the support surface to provide electrical grounding to the mat.
- The electrical conductors are provided in different forms. In one configuration, the conductors are parallel and disposed slightly above the upper surface of the body members of the mat. These parallel connectors are joined about the perimeter of the mat by a frame. Another configuration uses a mesh screen or web disposed over the top of the body members of the mat. The screen or web is connected to a frame or it can be wrapped around the edges of the mat. An optional filler such as a polymer or rubber may be disposed in the openings of the screen or web. The screen or web can be formed from flexible wires or a more rigid material such as sheets of expanded metal such as steel. Another configuration uses a thin sheet of conductive material disposed over the top of the body members of the mat. The thin sheet may be perforated or expanded to define openings. The sheet can be joined to the perimeter frame or its own perimeter frame.
- The perimeter frame and metal conductive layer can be added over the top of traditional wooden-body or polymer-body timber access mats when electrical grounding is required and then removed and stored when grounding is not required.
- The mats include electrical links that are used to electrically connect one mat to another such that each and every mat does not have to be individually pinned to the ground. This is beneficial when a platform is assembled from a plurality of mats. The electrical links can be wires such as steel cable leads. The steel cable leads can be located at each corner and across the width or length of the mat. A pair of leads can extend from each corner to connect other mats. Any of these cable leads can be pinned to the ground.
- Another configuration of the timber access mat includes a frame configuration with electrical connector tabs that are offset on opposite sides of the mat frame so that a plurality of mats can be arranged in an abutting array to form a multiple mat platform. The opposed edges of each mat complement each other to allow the edges to abut without connector tabs interfering with each other.
- The connector tabs allow electrical link cables to be attached from the top of the platform without requiring access to the bottom of the connector tab. This allows the mats to be connected and disconnected from above with a simple tool like a nut driver or a socket wrench.
- Another configuration of the timber access mat includes cable guides disposed in tandem with the connector tab to manage the location of the grounding cable and/or the electrical link cable leads. The cable guides protect the cable from damage by preventing pinching between mats and preventing the cable leads from dropping down and being trapped under the mats.
- The preceding non-limiting aspects, as well as others, are more particularly described below. A more complete understanding of the processes and the structures of the timber access mats can be obtained by reference to the accompanying drawings, which are not intended to indicate relative size and dimensions of the assemblies or components thereof. In those drawings and the description below, like numeric designations refer to components of like function. Specific terms used in that description are intended to refer only to the particular structure of the embodiments selected for illustration in the drawings, and are not intended to define or limit the scope of the disclosure.
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FIG. 1 depicts a top view of one configuration of the grounded timber access mat. -
FIG. 2 is a perspective view of theFIG. 1 configuration. -
FIG. 3 is a top view of a second configuration the grounded timber access mat. -
FIG. 4 is a top plan view of a four timber access mats arranged in an array. -
FIG. 5 is a top plan view of a single grounded timber access mat according to the third configuration. -
FIG. 6 is a side view taken along line 6-6 ofFIG. 5 . - In the configuration of
FIGS. 1 and 2 , atimber access mat 2 includes a plurality of non-conductivemat body members 4 disposed within ametal perimeter frame 6 disposed around the outside of the combinedbody members 4.Metal grounding slats 8 are disposed between or on top ofbody members 4. The ends of eachmetal grounding slat 8 are connected toperimeter frame 6. The ends can abutframe 6, rest on top offrame 6, or be disposed underframe 6. Eachmetal grounding slat 8 extends at least slightly above the upper surface ofbody members 4 so that a vehicle, a person, or other equipment supported bymat 2 will be in contact with at least onemetal grounding slat 8.FIG. 2 depicts the raised nature ofmetal grounding slats 8 in an exaggerated manner. Eachmetal grounding slat 8 can extend about a quarter inch above the upper surface ofbody members 4. Slats 8 can be a quarter inch by a quarter inch metal strips disposed on top ofbody members 4. Whenbody members 4 are traditional 2×4, 2×6, or 2×8 lumber, there can be multiplemetal grounding slats 8 disposed on eachbody member 4. Limiting the distance betweenmetal grounding slats 8 provides that a person or a vehicle will be in contact with at least one ofmetal grounding slats 8 when the person or vehicle is supported bytimber access mat 2. A distance of four to six inches from edge to edge between adjacentmetal grounding slats 8 is disclosed. Cross slats (not shown) can be used to increase the coverage of the conductive grounding members. The cross slats can be perpendicular toslats 8. Each ofmetal grounding slats 8 can be disposed one quarter of an inch above the upper surface ofbody members 4.Metal grounding slats 8 can be friction fit toframe 6, bolted or riveted toframe 6, or welded toframe 6. - An alternative configuration uses a filler material or a filler strip disposed between
slats 8 to provide a flat surface tomat 2. - Flexible electrical cable leads 10 are connected to
frame 6. Cable leads 10 can be located near the corners offrame 6. A pair or a plurality of cable leads 10 can extend from each location. Cable leads 10 are used to connectmats 2 or connectmat 2 to a grounding pin that is driven into the ground. Cable leads 10 can be bolted toframe 6 but also can be welded toframe 6. Eachcable lead 10 can carry a bolt receiver at its loose end for receiving a bolt that is used to securecable lead 10 to anothermat 2 or to the grounding pin. - The mat configurations of
FIGS. 3-6 are similar to the above configuration and the same reference numerals are used to identify similar elements. In place ofslats 8, these mat configurations use aconductive cover layer 12 that is in the form of a mesh or conductive screen made of electrically conductive material such as steel. Another configuration uses a thin perforated metal foil as theconductive cover layer 12. One or a plurality of expanded metal sheets can be used over the body of the mat asconductive cover layer 12. An advantage to using the mesh, screen, or expanded metal is that the size of the gaps between conductive elements is small and a person standing onmat 2 is guaranteed to be in contact with multiple locations oflayer 12.Conductive cover layer 12 can be bolted or welded toframe 6.Conductive cover layer 12 also can be wrapped around the sides offrame 6 and bolted to the sides or bottom offrame 6. - In the configurations using expanded metal sheets as
conductive cover layer 12, each sheet of expanded metal can be lag bolted down into the body members of the mat with washers cooperating with the bolt heads to grip the expanded metal sheet. The lag bolts and washers allow the expandedmetal layer 12 andframe 6 to be to and removed from thebody members 4. This allows existing non-grounding timber access mats to be converted to grounding mats as needed. The edges of adjacent expandedmetal sheets 12 are overlapped and either secured with bolts or welds or left loose. The expandedmetal sheets 12 are welded or bolted toframe 6. An upper leg offrame 6 extends over an upper perimeter portion of the body with the edges of the expanded metal sheets disposed under the upper leg offrame 6. Another leg offrame 6 extends down the side of the body of the mat. The two legs cooperate to define an L-shaped cross section such thatframe 6 sits over and surrounds the upper corners of the mat body. The upper leg offrame 6 is secured with connectors such as lag bolts directly down into the body members of the mat. - The
grounding pin 18 is connected to frame 6 with aflexible cable 10. The flexible cable is connected at a raised U or C-shaped cleat that allows a tight bolted connection to be made between theflexible cable 10 and theframe 6. A plurality offlexible cables 10 can extend from a single cleat. Theflexible cables 10 allow multiple mats to be electrically connected to asingle grounding pin 18. - This configuration of
FIG. 3 also discloses the use offlexible connectors 14 disposed undercover 12 and betweenbody members 4 to directly connect the different locations where cable leads 10 are secured toframe 6 in order to provide for direct cabled electrical contact between these locations.Connectors 14 may be disposed betweenbody members 4 and lower than the upper surface ofbody members 4.Connectors 14 can be directly connected to the inside offrame 6 or wrapped under the lower edge offrame 6 and connected to the cleats the receive cable leads 10. - A filler material can be used to fill the openings defined by the material of
cover 12. The filler can be a rubber or polymer material that is sprayed onto the top ofmat 2 in an amount thin enough to leave the upper surfaces ofcover 12 exposed. - In the configuration of
FIGS. 4-6 , atimber access mat 20 includes a plurality ofbody members 4 disposed within ametal perimeter frame 6.Frame 6 includes four upper, generally horizontal, frame members disposed over the outer upper perimeter portions of the timber access mat body.Frame 6 also includes vertical frame members extending down from the outer edges of the upper frame members such that they are disposed outwardly or against the outside edges of the timber access mat body.Conductive cover layer 12 such as a sheet or multiple sheets of expanded metal are disposed over the top ofbody members 4 with the perimeter edges of the expanded metal sheets disposed under the upper frame members offrame 6 as depicted inFIG. 4 . Theconductive cover layer 12 can be welded toframe 6. Also,bolts 22 may be used to secure the perimeter edge ofconductive cover layer 12 toframe 6. In some configurations,bolts 22 do not extend intobody members 4. In other configurations,bolts 22 are lag bolts that extend throughframe 6, throughconductive cover layer 12, and intobody members 4 to removably secure the assembly together. Bolt andwasher combinations 24 can be used to connect the expanded metal sheets tobody members 4. The washers can be integrated with bolts or provided as separate articles.Bolts frame 6 andcover layer 12 to be removed frombody members 4. - A plurality of
connector tabs 30 extend from thevertical walls 32 offrame 6.Connector tabs 30 extend generally horizontal fromvertical walls 32.Connector tabs 30 can be formed by welding or securing with mechanical connectors L-shaped lengths of metal to the outer side surfaces offrame 6.Connector tabs 30 are arranged in complementary positions on opposite walls offrame 6 such thatmats 20 can be arranged side-by-side withoutconnector tabs 30 interfering with each other.FIG. 5 shows howconnector tabs 30 are offset so they interlock andFIG. 4 depicts how these positions complement each other.Connector tabs 30 may directly abut theother frame 6 or cable guides 34 may directly abut the other frame or both can be the same width and function to space the adjacent frame members and prevent the crushing of cable leads 10. Eachcable guide 34 is a loop sized to receive cable leads 10. Threading cable leads 10 throughcable guide 34 helps preventcable lead 10 from being pinched betweenadjacent mats 20 and prevents cable from falling down below the mats. In this configuration, eachcable lead 10 is secured toconnector tab 30 with a pair ofbolts 36 that position the end ofcable lead 10 parallel (and substantially horizontal) to the wall offrame 6 from whichconnector tab 30 extends. This keeps the ends of cable leads 10 out of the way whenmats 20 are disposed edge-to-edge. Each connector tab can define space for multiple cable lead ends.Bolts 36 can be threaded into threaded openings 38 (FIG. 6 ) or into threaded nuts (optional) 40 welded to the bottom ofconnector tab 30. This configuration allowsbolts 36 to be secured whenmats 20 are disposed edge-to-edge as shown inFIG. 4 . Cable leads 10 are used to electrically connectmats 20. Cable leads 10 also are used to connect a grounding pin tomat 20. - The
metal frame 6 andconductive cover layer 12 can be galvanized. In the foregoing description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed. Moreover, the descriptions and illustrations of the exemplary configurations are examples and the claimed invention is not limited to the exact details shown or described. Throughout the description and claims of this specification the words “comprise” and “include” as well as variations of those words, such as “comprises,” “includes,” “comprising,” and “including” are not intended to exclude additives, components, integers, or steps.
Claims (22)
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US16/001,610 US10106935B1 (en) | 2014-11-07 | 2018-06-06 | Electrically-grounded work platform |
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US201462077014P | 2014-11-07 | 2014-11-07 | |
US201462080343P | 2014-11-16 | 2014-11-16 | |
US201462092088P | 2014-12-15 | 2014-12-15 | |
US14/936,489 US9458578B2 (en) | 2014-11-07 | 2015-11-09 | Timber access mat with grounding |
US15/280,478 US10011959B2 (en) | 2014-11-07 | 2016-09-29 | Timber access mat with grounding |
US16/001,610 US10106935B1 (en) | 2014-11-07 | 2018-06-06 | Electrically-grounded work platform |
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US15/280,478 Continuation US10011959B2 (en) | 2014-11-07 | 2016-09-29 | Timber access mat with grounding |
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US15/280,478 Active 2036-02-15 US10011959B2 (en) | 2014-11-07 | 2016-09-29 | Timber access mat with grounding |
US16/001,610 Active US10106935B1 (en) | 2014-11-07 | 2018-06-06 | Electrically-grounded work platform |
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US15/280,478 Active 2036-02-15 US10011959B2 (en) | 2014-11-07 | 2016-09-29 | Timber access mat with grounding |
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-
2015
- 2015-11-09 US US14/936,489 patent/US9458578B2/en active Active
- 2015-11-09 CA CA2911751A patent/CA2911751C/en active Active
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CA2911751C (en) | 2018-09-11 |
US9458578B2 (en) | 2016-10-04 |
US20160134031A1 (en) | 2016-05-12 |
US20170114505A1 (en) | 2017-04-27 |
CA2911751A1 (en) | 2016-05-07 |
US10106935B1 (en) | 2018-10-23 |
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