AUTONOMOUS CLEANING SYSTEMS AND METHODS FOR PHOTOVOLTAIC MODULES

A docking station for use with a solar tracking system includes a frame configured to selectively support solar cleaning equipment thereon and a mounting bracket operably coupled to a portion of the frame. The mounting bracket maintains a gap between adjacent edges of the frame and an adjacent solar module, and the frame includes a width that approximates a width of the solar module.

BACKGROUND

Technical Field

The present disclosure relates to solar power generation systems, and more particularly, to autonomous cleaning systems for photovoltaic modules.

Background of Related Art

Solar cells and solar panels are most efficient in sunny conditions when oriented towards the sun at a certain angle. Many solar panel systems are designed in combination with solar trackers, which follow the sun's trajectory across the sky from east to west in order to maximize the electrical generation capabilities of the systems. The relatively low energy produced by a single solar cell requires the use of thousands of solar cells, arranged in an array, to generate energy in sufficient magnitude to be usable, for example as part of an energy grid. As a result, solar trackers have been developed that are quite large, spanning hundreds of feet in length.

As can be appreciated, the ability of the solar cells to generate electrical energy is diminished as the surface of the solar cells becomes dirty, through dust, soil, pollen, etc. As the layer of dust becomes thicker, or the layer covers more surface area of the solar cells, the amount of energy generated is diminished and the solar panel system will not perform at peak efficiency. Further, dust partially or fully covering the surface of the solar cells can cause hot spots to form on the uncovered portions of the solar cell, causing accelerated degradation of the solar cell.

In view of the numerous issues caused by dirty solar cells, it is important to regularly clean the surface of the cells to ensure the solar panel system operates as close to peak efficiency as possible. Typically, the numerous solar panels are cleaned using a specialized vehicle or manually using water. As can be appreciated, such cleaning requires enormous manpower, as the size of the solar system may cover several acres. The present disclosure seeks to address the shortcomings of prior solar tracker cleaning systems.

SUMMARY

In accordance with an aspect of the present disclosure, a docking station for use with a solar tracking system includes a frame configured to selectively support a solar cleaning equipment thereon and a mounting bracket operably coupled to a portion of the frame. The mounting bracket maintains a gap between adjacent edges of the frame and an adjacent solar module and the frame includes a width that approximates a width of the solar module.

In aspects, the mounting bracket may maintain the frame in a fixed position.

In other aspects, the mounting bracket may permit the frame to move simultaneously with movement of an adjacent solar module.

In certain aspects, the width of the frame may be fixed.

In other aspects, the width of the frame may be adjustable.

In aspects, the width of the frame may be adjustable from about 2000 mm to about 2400 mm.

In certain aspects, the frame may include telescoping members to permit adjustment of a width of the frame.

In aspects, the mounting bracket may be coupled to a portion of a torque tube of the adjacent solar module such that rotation of the torque tube effectuates a corresponding rotation of the mounting bracket and thereby the frame.

In accordance with another embodiment of the present disclosure, a row-to-row bridge for use with a solar tracking system includes a frame configured to selectively support cleaning equipment and accommodate twisting of one end portion thereof relative to a second end portion thereof, a first mounting bracket interconnecting a first portion of the frame and a portion of a first adjacent solar module, and a second mounting bracket interconnecting a second portion of the frame and a portion of a second adjacent solar module.

In aspects, the frame may include a pair of transverse beams disposed in spaced relation to one another and each extending between opposed first and second end portions, each of the pair of transverse beams coupled to a respective one of the first and second adjacent solar modules such that rotation of the adjacent first and second solar modules effectuates a corresponding rotation of the frame.

In other aspects, the frame may include a pair of parallel beams interposed between the pair of transverse beams and operably coupled thereto, wherein the pair of parallel beams cooperate to permit differing degrees of rotation of a first transverse beam relative to a second transverse beam about an axis defined perpendicular to the pair of transverse beams.

In certain aspects, each of the parallel beams may include an inner tube and an outer tube configured to rotatably and translatably receive a portion of the inner tube therein.

In other aspects, each of the parallel beams may include an insert disposed within a portion of the outer tube, the insert defining a bore therethrough configured to rotatably and translatably support a portion of the inner tube therein.

In aspects, each of the parallel beams may include a corresponding pair of couplings operably coupled to respective first and second end portions thereof, each of the pair of couplings configured to rotatably couple the pair of parallel beams to each respective transverse beam of the pair of transverse beams.

In accordance with another aspects of the present disclosure, a row-to-row bridge for use with a solar tracking system includes a frame configured to selectively support cleaning equipment thereon, wherein the frame is configured to accommodate twisting of one end portion thereof relative to a second end portion thereof, and a pair of mounting brackets configured to couple the frame to a pair of adjacent solar modules, wherein the frame is configured to selectively permit adjustment of a width of the frame.

In aspects, the frame may include telescoping members to permit adjustment of the width of the frame.

In certain aspects, the telescoping members may include a detent mechanism configured to selectively lock the telescoping members to one another and maintain a desired width of the frame.

In other aspects, the detent mechanism may be a button pin.

In aspects, each of the telescoping members may include a corresponding plurality of holes defined therethrough, wherein the plurality of holes of each of the telescoping members and the detent mechanism cooperate to selectively define a width of the frame.

In other aspects, the frame may include a pair of parallel beams, each beam of the parallel beams including an inner tube and an outer tube configured to rotatably and translatably receive a portion of the inner tube therein.

In accordance with another aspect of the present disclosure, a bridge for use with a solar tracking system includes a frame configured to selectively support cleaning equipment thereon, where the frame is configured to bridge a gap between adjacent solar modules, the gap configured to accommodate a slew drive, and a pair of mounting brackets configured to couple the frame to a pair of adjacent torque tubes, each torque tube coupled to a respective output of the slew drive, wherein the frame is configured to selectively permit adjustment of a width of the frame.

In aspects, wherein the frame may be collapsible from an open, expanded position to a closed, folded position.

In certain aspects, the frame may include hinges operably coupled thereto to permit the transition from the open, expanded position, to the closed, folded position.

In other aspects, the hinges may be disposed adjacent an end portion of respective beams forming the frame.

In certain aspects, the frame may include a pair of parallel beams, at least one of the parallel beams defining an arcuate profile.

In other aspects, the frame may include a pair of transverse beams, at least one of the pair of transverse beams defining a flange, the flange couplable to a portion of an adjacent solar module.

DETAILED DESCRIPTION

The present disclosure is directed to mechanisms for storage and transport of cleaning equipment over a length of solar panels. As can be appreciated, in an effort to extract as much solar energy as possible, solar trackers have been developed that are quite large, spanning hundreds of feet in length. Further, to extract energy more efficiently, solar tracking systems rotate solar modules to maintain a desired orientation towards the sun as the sun traverses the sky from east to west. To accommodate this movement, the solar tracking systems are broken up into numerous sections along their length to minimize tortional loads and deflection, and to accommodate various mechanical systems, such as gear drives, communication antennae, amongst others. As such, gaps are formed between adjacent solar modules that inhibit the free movement of the cleaning equipment across an entire length of a tracking system.

The present disclosure includes docking stations, bridges, and other devices configured to permit the free movement of the solar modules while permitting movement of cleaning equipment across and entire row of solar modules and parking of solar modules while not in use. In particular, the docking stations described herein may be stationary such that the solar modules may rotate relative thereto or may be coupled to a torque tube of adjacent solar modules to enable the docking station to rotate in unison with the solar modules. In this manner, the docking station is separated from the adjacent solar module to provide a gap to permit free movement of the solar module relative to the docking station and vice versa. The docking station provides a location for the cleaning equipment to park or otherwise be placed when not in use, to avoid parking on a solar module and reducing the overall capacity of the solar module to absorb energy.

Similarly, slew drive bridges and row-to-row bridges are provided in accordance with the present disclosure to bridge a gap formed between adjacent solar modules where slew drives or other electromechanical systems are located and between adjacent rows of solar modules. In this manner, the bridges enable the cleaning equipment to traverse an entire row of solar modules or multiple rows of solar modules to reduce the amount of cleaning equipment required.

Further, as can be appreciated, once the cleaning equipment reaches a final solar module in a row of solar modules, it is difficult to clean the entirety of the solar module since the cleaning equipment is unable to extend therepast. To alleviate this issued, a return station is provided in accordance with the present disclosure which provides a location at which the cleaning equipment may traverse past the last solar module and to enable the cleaning equipment to fully clean the last solar module of the solar tracking system and to provide a means to alert the cleaning equipment that the end of the row of solar modules and to inhibit the cleaning equipment from falling off or otherwise becoming disengaged from the solar tracking system.

With reference to the drawings, a solar tracking system is illustrated inFIGS.1and1Aand generally identified by reference numeral1000. The solar tracking system1000includes one or more solar modules1002disposed adjacent to one another to form a continuous row. As can be appreciated, the solar tracking system1000includes a first end portion1006and an opposite, second end portion1008. The first end portion1006includes a docking station10disposed adjacent thereto to provide a space for cleaning equipment2000to dock or otherwise be retained when the cleaning equipment2000is not in use. The second end portion1008includes a return station800disposed adjacent thereto to provide a location at which the cleaning equipment2000may traverse to enable the cleaning equipment2000to fully clean the last solar module1002of the solar tracking system1000and to provide a means to alert the cleaning equipment2000that the end of the row of solar modules1002and to inhibit the cleaning equipment2000from falling off or otherwise becoming disengaged from the solar tracking system1000.

The solar tracking system1000includes numerous slew drives (not shown) for effectuating rotation of the solar modules1002during tracking of the sun. As can be appreciated, a gap or other interruption is formed between adjacent solar modules which may interfere with and inhibit movement of the cleaning equipment2000thereacross. A slew drive bridge300is provided at these locations to enable the cleaning equipment2000to traverse the gap formed between adjacent solar modules1002adjacent the slew drive.

Due to the large size of the row of solar modules1002, it is necessary to limit the overall length of a row of interconnected solar modules1002. Accordingly, a gap is formed between adjacent rows of interconnected solar modules1002which may interfere with and inhibit movement of the cleaning equipment2000thereacross. To enable the transition of the cleaning equipment2000from one row to the next, a row-to-row bridge600is provided.

With reference toFIGS.2and2A, the docking station10includes a frame20and a base40that is configured to support the frame. The frame20includes a pair of longitudinal beams22, a transverse beam24, a mid-beam26, first struts28, second struts30, and a pair of brush supports32.

The pair of longitudinal beams22is disposed in spaced relation to one another and extend along a length of the solar tracking system1000(FIG.1) between opposed first and second end portions22aand22b, respectively. The pair of longitudinal beams22is arranged in a parallel configuration and is spaced apart from the other a distance such that each beam of the pair of longitudinal beams22is substantially aligned with an outer edge1002aof the solar modules1002of the solar tracking system1000to enable a smooth transition of the cleaning equipment2000from the solar modules1002to the frame20, as will be described in further detail hereinbelow. In embodiments, the pair of longitudinal beams22may be arranged in any suitable configuration capable of receiving the cleaning equipment2000, such as non-parallel or the like.

Although generally illustrated as being a box tube, it is contemplated that the pair of longitudinal beams22may be any suitable beam capable of supporting a weight of the cleaning equipment2000, such as C-channel, I-beams, H-beams, circular or round beams, etc. In embodiments, each beam of the pair of longitudinal beams22may include the same profile or may include different profiles, depending upon the installation needs of the docking station10.

The transverse beam24is coupled to the first end portion22aof each of the pair of longitudinal beams22and extends between opposed first and second end portions24aand24b, respectively, along a width of the solar tracking system1000. It is contemplated that the transverse beam24may be coupled to the first end portion22aof each of the pair of longitudinal beams22using any suitable means, such as fasteners, welding, adhesives, amongst others. In one non-limiting embodiments, the transverse beam24is welded to the first end portion22aof each of the pair of longitudinal beams22.

The transverse beam24includes a length such that the opposed first and second end portions24a,24bextend past each of the pair of longitudinal beams22, although it is envisioned that the transverse beam24may include any suitable length, such that the opposed end portions24a,24bextend any suitable distance from each of the pair of longitudinal beams22or terminate at each of the pair of longitudinal beams22(e.g., the opposed first and second end portions24a,24bare flush with the pair of longitudinal beams22).

Although generally illustrated as being a box tube, it is contemplated that the transverse beam24may be any suitable beam capable of supporting a weight of the cleaning equipment2000, such as C-channel, I-beams, H-beams, circular or round beams, etc., and may be the same or different than the profile of the pair of longitudinal beams22.

The mid-beam26extends between opposed first and second end portions26aand26b, respectively, along a width of the solar tracking system1000. The mid-beam26is interposed between the pair of longitudinal beams22such that the first and second end portions26a,26bof the mid-beam abut a corresponding portion of each of the pair of longitudinal beams22. The mid-beam26is disposed at a location that is between the first and second end portions22a,22bof the pair of longitudinal beams22to provide additional support to the frame20. Although generally illustrated as being closer to the second end portion22bof the pair of longitudinal beams22, it is contemplated that the mid-beam26may be disposed at any suitable location therebetween.

It is contemplated that the transverse beam24may be coupled to the first end portion22aof each of the pair of longitudinal beams22using any suitable means, such as fasteners, welding, adhesives, amongst others. In one non-limiting embodiments, the transverse beam24is welded to the first end portion22aof each of the pair of longitudinal beams22. Although generally illustrated as being a box tube, it is contemplated that the mid-beam26may be any suitable beam capable of supporting a weight of the cleaning equipment2000, such as C-channel, I-beams, H-beams, circular or round beams, etc., and may be the same or different than the profile of the pair of longitudinal beams22and the transverse beam24.

The first strut28defines an elongate body extending between opposed first and second end portions28aand28b, respectively. The first end portion28aof the first strut28is coupled to a portion of the transverse beam24adjacent the first end portion24aand the second end portion28bof the first strut28is coupled to a portion of the base40. The first strut28is oriented relative to each of the transverse beam24and the base40at an angle (e.g., diagonal) to triangulate or otherwise form a triangle shape between each of the transverse beam24, the first strut28, and the base40to inhibit rotation of the frame20about the base40and to increase the stiffness of the transverse beam24.

The second strut30is substantially similar to the first strut28except that the second strut includes a length that is greater than the first strut. In this manner, the second strut30is coupled to the base at a first end portion30aand is coupled to the transverse beam24adjacent the second end portion24bto triangulate or otherwise form a triangle (e.g., disposed diagonal) shape between each of the transverse beam24, the second strut30, and the base40to inhibit rotation of the frame20about the base40and to increase the stiffness of the transverse beam24. The second strut30includes a length that is greater than a length of the first strut such that the frame20is oriented at an angle relative to a vertical axis “Y” and is substantially similar to an angle of the solar modules1002when the solar modules1002are placed in a stow position. In embodiments, the angle of the frame20relative to the vertical axis “Y” is 30 degrees. It is contemplated that an angle at which the frame20is oriented relative to the solar modules1002may differ by ±2 degrees to ensure that the cleaning equipment2000may transition from the solar modules1002to the frame20without being dislodged or be jammed, rendering the cleaning equipment2000inoperable.

The first and second struts28,30are arranged in pairs such that each of the transverse beam24and the mid-beam26include a corresponding pair of first and second struts28,30to increase the stiffness of the frame from bending and/or rotation relative to the base40. Although generally illustrated as being a box tube, it is contemplated that each of the first and second struts28,30may be any suitable beam capable of supporting a weight of the cleaning equipment2000, such as C-channel, I-beams, H-beams, circular or round beams, etc., and may be the same or different than one another or the same of different than the profile of the pair of longitudinal beams22, the transverse beam24, or the mid-beam26.

The pair of brush supports32are substantially similar and therefore only one brush support32will be described in detail hereinbelow in the interest of brevity. The brush support32includes an L-shaped profile disposed in an inverted orientation. In this manner, the brush support32includes a first leg34terminating at an end portion34aand a second leg36coupled to the first leg24and terminating at an end portion36a. The end portion34aof the first leg34is coupled to the transverse beam24adjacent the first end portion24athereof such that the second leg36extends along the length of the solar tracking system1000. Although illustrated as being disposed adjacent a location where the first end portion28aof the first strut28is coupled to the transverse beam24, it is contemplated that the brush support32may be coupled to the transverse beam24at any suitable location. It is envisioned that the brush support32may be coupled to the transverse beam24using any suitable means, such as such as fasteners, welding, adhesives, amongst others. In one non-limiting embodiments, the end portion32aof the brush support32is welded to the transverse beam24. The pair of brush supports32cooperate to provide support to one or more brushes (not shown) of the cleaning equipment2000when the cleaning equipment2000is supported on the frame20.

Continuing withFIGS.2and2A, the base40defines a generally C-shaped profile, although it is contemplated that the base may be any suitable beam capable of supporting the frame20, such as box beams, I-beams, H-beams, etc. The base40extends between a first end portion40athat is configured to be anchored in the ground and an opposite, second end portion40bthat is configured to support the frame20. In this manner, a pair of flanges42aand42bis coupled to opposed sides of the base40such that each of the pair of flanges42a,42bis disposed in juxtaposed relation to one another. Although generally illustrated as being disposed at a midpoint between the first and second opposed end portions40a,40bof the base40, it is contemplated that the pair of flanges42a,42bmay be disposed at any location along the length of the base40, and each of the pair of flanges42a,42bmay be disposed at similar or different locations along the length thereof (e.g., mirrored or staggered, etc.). Each of the pair of flanges42a,42bis configured to be coupled to a respective second end portion28b,30bof the first and second struts28,30, respectively. Although generally illustrated as being coupled to the first and second struts28,30using fasteners, it is contemplated that the pair of flanges42a,42bmay be coupled to each of the first and second struts28,30using any suitable means, such as welding, adhesives, amongst others. In embodiments, the base40may not include flanges, or may include only one flange of the pair of flanges42a,42b.

The base40includes an upper bracket44coupled to the second end portion40band extending therefrom. The upper bracket44is configured to be operably coupled to a portion of the transverse beam24and thereby support the frame20on the base40. As can be appreciated, the pair of lower flanges42a,42bcooperate with the first and second struts28,30to maintain the frame20at an angle relative to a vertical axis “Y” that is substantially similar to an angle of the solar modules1002when the solar modules1002are placed in a stow position. In embodiments, the base40maintains the frame20a distance from the adjacent solar modules1002such that the solar modules1002may articulate relative to the docking station10. In this manner, as the solar modules1002are caused to articulate during the course of a day, the solar modules1002are permitted to articulate relative to the docking station10, which remains stationary and enables the solar modules1002to be unencumbered while articulating. In embodiments, the distance between the respective end portions22bof the pair of longitudinal beams22and the solar module is between 0 mm and 100 mm to ensure that the cleaning equipment2000may transition from the solar modules1002to the frame20without being dislodged or be jammed, rendering the cleaning equipment2000inoperable.

With additional reference toFIG.2B, it is envisioned that the docking station10may include a photovoltaic module50(e.g., solar cell) disposed thereon to generate additional energy during times when the cleaning equipment2000is not stowed on docking station10. In embodiments, the photovoltaic module50may be utilized to generate energy to charge batteries (not shown) or other energy storage devices associated with the cleaning equipment2000. It is contemplated that the photovoltaic module50is interposed between each of the pair of longitudinal beams22, the transverse beam24, and mid-beam26(e.g., in the open spaced defined within the frame20). As can be appreciated, the photovoltaic module50may be disposed at any location within the open space within the frame20, and may include any suitable length and width, depending upon the design needs of the docking station10. In one non-limiting embodiment, the photovoltaic module50includes a length and width that is less than a length and width of the frame20and is disposed adjacent the mid-beam26. The frame20includes an additional beam52that extends between and is coupled to each of the pair of longitudinal beams22. In this manner, the photovoltaic module50is coupled to each of the mid-beam26and the beam52using any suitable means, such as fasteners, welding, adhesives, amongst others.

With reference toFIG.2C, it is contemplated that an additional photovoltaic module60may be disposed on the pair of brush supports32to generate additional energy during time the cleaning equipment2000is stowed on the docking station10. It is envisioned that the photovoltaic module60may include any suitable dimension and may be coupled to the pair of brush supports32using any suitable means, such as fasteners, welding, adhesives, amongst others.

Turning toFIG.2D, it is contemplated that docking station10may include one or more wind protection plates70and72. The wind protection plates70,72shelter or otherwise inhibit wind loads from acting on the cleaning equipment2000when the cleaning equipment2000is stowed on the docking station10. In this manner, the wind protection plate70is disposed on a portion of the pair of brush supports32using any suitable means, such as fasteners, welding, adhesives, amongst others and the wind protection plate72is disposed within the open spaced formed within the frame20. It is envisioned that the wind protection plate72may be coupled to the frame20using any suitable means, such as fasteners, welding, adhesives, amongst others. It is contemplated that the wind protection plates may be formed from any suitable material, such as metallic (e.g., steel, aluminum, etc.) and non-metallic (e.g., polymers, ceramics, etc.) materials depending upon the design needs of the docking station10.

With additional reference toFIGS.2E and2F, it is envisioned that the frame20may be disposed on a single base40. In this manner, the frame20is coupled to the base40using a plurality of struts80extending from the base to a respective portion of the frame20. In one non-limiting embodiment, the frame20is supported on the base40using four struts80, each coupled to a respective corner of the frame20. In embodiments, the struts80may be coupled to a coupling82having an interior profile that is complementary to that of the base40(e.g., a square or rectangular profile). It is envisioned that the coupling82may be coupled to the base40using any suitable means, such as fasteners, welding, adhesives, amongst others. It is contemplated that the angle formed between the struts80and the base40may be altered depending upon the overall size of the frame20and the height at which the frame20is disposed above the base40.

With reference toFIGS.2G and2H, another embodiment of the docking station10having the frame20supported by a single base40is illustrated. The frame20is supported on the base40using a support frame90having a generally triangular profile such that the frame20is supported on the base at an angle relative thereto (e.g., not perpendicular to the base40). It is contemplated that the support frame90may include any number of beams92and may be coupled to the base40using any suitable means, such as fasteners, welding, adhesives, amongst others. In one non-limiting embodiment, the support frame90is coupled to the base40using one or more brackets94, such as angle brackets, U-brackets, amongst others.

With additional reference toFIGS.3-4A, another embodiment of a docking station is illustrated and generally identified by reference numeral110. The docking station110is substantially similar to the docking station10described hereinabove, and therefore, only the differences therebetween will be described in detail in the interest of brevity.

The pair of longitudinal beams122include a generally C-shaped profile and each is disposed in a juxtaposed relation to one another such that the open side portion122cof the C-shaped profile is facing one another (e.g., towards an interior portion of the frame120). A gusset122d(FIG.4A) or bracket is disposed within the open side portion122cand adjacent the first end portion122aof each of the pair of longitudinal beams122. The gusset122dincludes a generally right triangular profile, although other suitable profiles are contemplated. A first side122eof each of the gussets122dis coupled to each respective longitudinal beam122and a second side122fof each of the gussets122dis coupled to a respective portion of the transverse beam124, as will be described in further detail hereinbelow. It is contemplated that each gusset122dmay be coupled to each respective longitudinal beam122and transverse beam124using any suitable means, such as such as fasteners, welding, adhesives, amongst others.

Continuing withFIGS.3-4A, the transverse beam124is substantially similar to the transverse beam24of the docking station10except that the transverse beam124includes a first plurality of holes124cdefined therethrough adjacent the first end portion124aand a second plurality of holes124ddefined therethrough adjacent the second end portion124b. Each of the first and second plurality of holes124c,124ddefines a plurality of columns of holes having a pair of holes in each column, although it is contemplated that each column may include any suitable number of holes, such as one, three, four, etc. Each of the first and second plurality of holes124c,124dextend longitudinally along the transverse beam124defining a plurality of locations at which the pair of longitudinal beams122may be selectively coupled, thereby altering a distance from one another the pair of longitudinal beams122may be spaced (e.g., further or closer to one another). In this manner, each respective gusset122dis coupled to a respective column of holes of the first and second plurality of holes124c,124d, to place the pair of longitudinal beams122at the desired location depending upon the type of cleaning equipment2000being used or the installation requirements of the solar modules1002.

The mid-beam126of the docking station110is substantially similar to the mid-beam26of the docking station10except that the mid-beam126includes a generally C-shaped profile and a pair of telescoping brackets126c. Each of the pair of telescoping brackets126cincludes a generally C-shaped profile and is disposed adjacent a respective first and second end portion126a,126bof the mid-beam126and is slidably received within an interior portion126dof the C-shaped profile of the mid-beam126. In this manner, the pair of telescoping brackets126cis permitted to selectively slide relative to the mid-beam126to alter an overall length of the mid-beam126such that each of the pair of telescoping brackets126c, and thereby the mid-beam126, may be coupled to the pair of longitudinal beams122regardless of the distance at which each beam of the pair of longitudinal beams122is spaced from one another. In embodiments, the pair of telescoping brackets126cenable the overall length of the mid-beam126to vary between about 2000 mm and about 2400 mm, although any suitable length is contemplated depending upon the design needs of the docking station110.

To accommodate the varying positions at which each of the pair of telescoping brackets126cmay be disposed relative to the mid-beam126, the mid-beam126includes a plurality of holes126edefined therethrough adjacent each respective end portion126a,126b. Similarly, each of the pair of telescoping brackets126cincludes a corresponding plurality of boreholes (not shown) defined therethrough such that the pair of telescoping brackets126cmay be selectively coupled to the mid-beam126at a desired location to define a desired overall length of the mid-beam126including the pair of telescoping brackets126cusing any suitable means, such as fasteners, rivets, etc. Although generally described has having a plurality of holes126eand a plurality of boreholes, it is envisioned that the mid-beam126may include a single hole adjacent each end portion126a,126band the pair of telescoping brackets126cmay include a plurality of boreholes or vice versa depending upon the design needs of the docking station110. Although generally illustrated as having a C-shaped profile (e.g., a C-channel), it is contemplated that the mid-beam126and the pair of telescoping brackets126cmay include any suitable profile, such as a box tube, an I-beam, an H-beam, etc. and may include the same or different profiles. In embodiments, the mid beam126may define a box shaped profile (e.g., box tube) defining a hollow interior portion extending therethrough that is configured to receive a detent mechanism or other similar device, such as the detent mechanism736illustrated inFIGS.18,19, and19Aherein.

Turning toFIGS.5and5A, another embodiment of a docking station is illustrated and generally identified by reference numeral210. The docking station210is substantially similar to the docking station10except the docking station210is coupled to a torque tube extension1004of a torque tube (not shown) of the solar tracking system1000. Accordingly, only the differences between the docking station210and the docking station10will be described in further detail herein in the interest of brevity.

The docking station210includes a pair of brackets250aand250b, respectively. The first bracket250aof the pair of brackets is coupled to a portion of the transverse beam224and a second bracket250bof the pair of brackets is coupled to a portion of the mid-beam226. Each of the pair of brackets250a,250bis substantially similar to one another and therefore only one bracket of the pair of brackets250a,250bwill be described herein in the interest of brevity.

The first bracket250aincludes a pair of gussets252disposed on a portion of the transverse beam224using any suitable means, such as welding, adhesives, fasteners, etc. Although generally illustrated as being disposed at a mid-portion of the transverse beam224, it is contemplated that the pair of gussets252may be disposed at any location along the length of the transverse beam224, and in embodiments, is disposed at a similar location to a center of rotation of the adjacent solar modules1002of the solar tracking system1000. It is envisioned that the first bracket250amay be formed monolithically and the pair of gussets252may be formed by bending or otherwise plastically deforming the first bracket250a. Each of the pair of gussets252includes a notch254formed therein that is configured to receive a portion of the torque tube extension1006therein. In this manner the notch254defines a width that is substantially similar to a width of the torque tube extension1004such that the first bracket250ais permitted to translate (e.g., slide) along a length of the torque tube extension1004but is inhibited from translating transverse to the torque tube extension1004.

Continuing withFIG.5A, the first bracket250aincludes a fastener254that is configured to fixedly couple the frame220of the docking station210to the torque tube extension1004. It is contemplated that the fastener256is a U-bolt or other similar fastener having a pair of legs256aand256bextending from a backspan256c. In this manner, the torque tube extension1004is received within a gap256dformed between the pair of legs256a,256band the pair of legs256a,256bis received within a respective pair of holes224eand224fformed through the transverse beam224. A portion of each of the pair of legs256a,256bof the fastener256extend past an upper surface224gof the transverse beam224and is configured to threadably engage a respective pair of nuts (not shown), respectively. As can be appreciated, the torque tube extension1004is interposed (e.g., sandwiched) between the pair of gussets252and the backspan256cof the fastener256. In this manner, as the pair of nuts is tightened and draws the fastener256towards the pair of gussets252, the torque tube extension1004is squeezed or otherwise clamped therebetween and inhibited from translating relative to the first bracket250a.

In operation, the torque tube extension1004is fixedly coupled to torque tube (not shown) of the solar tracking system1000using any suitable means (e.g., fasteners, welding, adhesives, amongst others) such that as the torque tube of the solar tracking system1000is caused to rotate and otherwise track a location of the sun, rotation of the torque tube effectuates a corresponding rotation of the torque tube extension1004, and thereby the docking station210, such that the solar modules1002and the docking station rotate in unison. As can be appreciated, by being aligned with, and rotating in unison with, the adjacent solar module1002, the docking station210enables the cleaning equipment2000to transition from the adjacent solar module1002to the docking station210at any time, regardless of the position of the solar module1002. As such, there is no need to wait until the solar module1002is placed in a stow position before the cleaning equipment2000can transition from the solar module1002to the docking station210.

Although generally described as having only one docking station210, it is contemplated that each row of solar modules1002of the solar tracking system1000may include a pair of docking stations210, with each docking station210of the pair of docking stations disposed on opposed end portions of the row of solar modules1002. In this manner, the cleaning equipment2000has more flexibility when being parked on a docking station210, such that the cleaning equipment2000may only have to traverse the row of solar modules1002once in order to reach a docking station210, rather than having to traverse the row of solar modules1002a second time to return to a single docking station210.

Turning toFIGS.6-7A, a slew drive bridge is illustrated and generally identified by reference numeral300. As can be appreciated, rotation of the solar modules1002of the solar tracking system1000requires a significant amount of torque, necessitating many individual slew gears or slew drives1010. The slew drives1010are interposed between adjacent solar modules1002and the torque tube of each respective solar module1002is coupled to the slew drive1010such that the slew drive1010effectuates rotation of each of the torque tubes, and therefore, each respective solar module1002. As the slew drive1010is interposed between adjacent solar modules1002, a gap exists between each adjacent solar module1002, inhibiting the cleaning equipment2000from freely and safely transitioning from one solar module1002to the other at each slew drive1010location.

The slew drive bridge300is configured to form a bridge between each adjacent solar module1002to enable the cleaning equipment2000to transition from one solar module1002, over the slew drive1010, and onto an adjacent solar module1002. The slew drive bridge300includes a pair of parallel beams302and304, respectively, a pair of transverse beams306and308, respectively, and a plurality of gussets310.

Each beam of the pair of parallel beams302,304is substantially similar, and therefore, only one parallel beam302of the pair of parallel beams302,304will be described in detail herein in the interest of brevity. The parallel beam302defines an elongate body302aextending between opposed first and second end portions302band302c, respectively. The elongate body302aincludes an upper surface302dand an opposite lower surface302e, each extending between opposed first and second side surfaces302fand302g, respectively, and the first and second end portions302b,302c. The upper and lower surfaces302d,302edefine a generally arcuate shape (e.g., an arch or the like) extending between the first and second end portions302b,302c, where a center portion of the elongate body302ais higher than each of the first and second end portions302b,302c. As can be appreciated, the arcuate profile of the elongate body302aprovides clearance for the slew drive1010as the cleaning equipment2000passes thereover on the slew drive bridge300. In embodiments, it is contemplated that the elongate body302amay define any suitable shape, such as a trapezoid, planar, amongst others, depending upon the design needs of the slew drive bridge300. Although generally illustrated as defining a rectangular tube profile, it is envisioned that the elongate body302amay define any suitable profile, such as a box tube, round tube, a solid structure, C-channel, H-channel, amongst others.

A pair of through-holes302his formed through the opposed first and second side surfaces302f,302gadjacent each of the respective first and second end portions302b,302c. Each respective pair of through-holes302his configured to receive a fastener therethrough, such as a bolt, rivet, etc., to couple the parallel beam302to a respective gusset310, as will be described in further detail hereinbelow.

With continued reference toFIGS.6-7A, each of the pair of transverse beams306,308is substantially similar and therefore only one transverse beam306will be described in detail hereinbelow in the interest of brevity. The transverse beam306includes an elongate body306adefining a generally C-shaped profile having a channel306bdefined therein and extending through opposed first and second end portions306cand306d, respectively. The channel306bis configured to receive a gusset310therein, as will be described in further detail hereinbelow. A side surface306eopposite the channel306bincludes a fin306fdisposed therein and extending therefrom. The fin306fdefines a generally planar profile defining opposed upper and lower surfaces306gand306h, respectively, and extending between each of the first and second end portions306c,306d. Although generally described as extending between the first and second end portions306c,306d, it is contemplated that the fin may extend any length along the elongate body306abetween first and second end portions306c,306d, depending upon the design needs of the slew drive bridge300.

A pair of bores306iis defined through the upper and lower surfaces306g,306hat a center portion of the fin306f. The pair of bores306iis configured to receive a corresponding pair of fasteners, rivets, etc. to selectively couple the transverse beam306to an adjacent solar module1002of the solar tracking system1000. It is envisioned that the transverse beam306may be coupled to the solar module1002using any suitable means, such as fasteners, rivets, adhesives, welding, etc., and it is contemplated that any number of fasteners or the like may be utilized to couple the transverse beam306to the solar module1002. A pair of through-bores306jis formed through the side surface306eand into the channel306badjacent each of the respective first and second end portions306cand306d. Each respective pair of through-bores306jis configured to receive a fastener therethrough, such as a bolt, rivet, etc., to couple the transverse beam306to a respective gusset310, as will be described in further detail hereinbelow.

The gusset310defines a generally triangular profile that is configured to be received within a respective channel306bof a transverse beam306and abut a second side surfaces302fof an adjacent parallel beam302. In this manner, the gusset310defines adjacent first and second side walls310aand310b, respectively, that intersect at a generally perpendicular or right angle relative to one another, although it is contemplated that the first and second side walls310a,310bmay intersect at any suitable angle depending upon the design needs of the slew drive bridge300. Each of the first and second side walls310a,310bextend between opposed upper and lower walls310cand310d, respectively, and cooperate to define a cavity310e(FIG.7) interposed between each of the first and second sidewalls310a,310b, and upper and lower walls310c,310d, respectively.

Each of the first and second sidewalls310a,310cinclude a corresponding pair of bores310fand310gdefined therethrough and extending into the cavity310e. As can be appreciated each of the pair of bores310fand310gis configured to align with a corresponding pair of through-holes302hof a parallel beam302and a corresponding pair of through-bores306jof an adjacent transverse beam306. In this manner, a corresponding fastener (not shown) may be received through each respective pair of bores310fand through holes302hand pair of bores310gand through-bores306jto couple the gusset310to the parallel beam302and the transverse beam306. Although generally described as being coupled to the parallel beam302and the transverse beam306via fasteners, it is contemplated that the gusset310may be coupled to the parallel beam302and the transverse beam306using any suitable means, such as adhesives, welding, and combinations thereof, amongst others. As can be appreciated, the pair of bores310fand310gmay be coupled to any of the parallel beams302and transverse beams306depending upon the orientation thereof during assembly.

The configuration of the slew drive bridge300provides torsional stability and reduces the load on each of the solar modules1002as the cleaning equipment2000traverses the slew drive bridge300and to an adjacent solar module1002. As can be appreciated, the fins306fof the pair of transverse beams306positively couples the slew drive bridge300to each adjacent solar module1002and ensures that during a high wind event, the slew drive bridge300remains firmly intact with the solar tracking system1000. In this manner, the slew drive bridge300may serve as a parking spot or docking station for the cleaning equipment2000during a high wind event if the cleaning equipment2000is unable to safely reach a docking station10.

Turning now toFIGS.8and9, a slew gear bridge is illustrated and generally identified by reference numeral400. The slew gear bridge400includes a pair of transverse beams402, a pair of parallel beams404, and a pair of torque tube brackets406. Each transverse beam of the pair of transverse beams402is substantially similar and therefore only one transverse beam402will be described in detail herein in the interest of brevity. The transverse beam402includes an elongate body402aextending between opposed first and second end portions402band402c, respectively. Although generally illustrated as having an arcuate profile extending between the first and second end portions402b,402c, it is contemplated that the elongate body402amay include any suitable profile such as planar, trapezoidal, amongst others. The elongate body402aincludes a generally square cross-sectional profile, although it is envisioned that any suitable profile may be utilized, such as circular, triangular, oval, amongst others.

A pair of couplings408is coupled to each of the first and second end portions402b,402cusing any suitable means, such as fasteners, adhesives, welding, amongst others. The pair of couplings408include a generally C-shaped profile defining a channel408asuch that a portion of the elongate body402aof the parallel beam402may be received therein adjacent a first end portion and a portion of an adjacent solar module1002may receive adjacent a second end portion thereof to couple the slew gear bridge400to adjacent solar modules1002.

Continuing withFIGS.8and9, each of the pair of parallel beams is substantially similar and therefore only one parallel beam404will be described herein in the interest of brevity. The parallel beam404defines an elongate body404aextending between opposed first and second end portions404band404c, respectively. Although generally illustrated as having a square profile, it is contemplated that the parallel beam404may include any suitable profile, such as circular, triangular, octagonal, etc. A pair of vertical beams404dand404eis disposed on an upper surface404fof the parallel beam404adjacent each of the first and second end portions404b,404c. Each of the pair of vertical beams404d,404eextends vertically from the upper surface404fof the parallel beam404and terminates at a respective upper surface404gand404h. In this manner, the parallel beam404defines a generally U-shaped profile. It is contemplated that the pair of vertical beams404d,404emay be coupled to the upper surface404fparallel beam404or any suitable portion of the parallel beam using any suitable method, such as fasteners, adhesives, welding, amongst others. In embodiments, the parallel beam404and each of the pair of vertical beams404d,404emay be a unitary component, where each of the pair of vertical beams404d,404eare formed by bending the parallel beam404.

Each of the pair of vertical beams404d,404eis coupled to the transverse beams402at a center portion thereof using a bracket410, although it is contemplated that the pair of vertical beams404d,404emay be coupled to the transverse beams402without using a bracket, such as directly connecting a portion of each of the vertical beams404d,404eto a portion of the transverse beams402by welding, adhesives, fasteners, or combinations thereof, amongst others.

Each of the pair of torque tube brackets406is substantially similar and therefore only one torque tube bracket406will be described herein in the interest of brevity. The torque tube bracket406includes a base406a, an upper clamp406b, and a fastener406c. The base406adefines a generally rectangular profile, although it is contemplated that any suitable profile may be utilized, such as square, oval, circular, amongst others. The base406ais coupled to the upper surface404fof the parallel beam404at a lower portion thereof406dusing any suitable means, such as welding, adhesives, fasteners, rivets, amongst others. The base406adefines an upper surface406eincluding a cavity406fdefined therein having a concave profile. It is envisioned that the cavity406fmay include any suitable profile, such as triangular, pentagonal, octagonal, amongst others, and in embodiments, may have the same or different profile than that of a torque tube (not shown) of the solar modules1002. In embodiments, the base406ais formed from a rectangular tube having a channel (not shown) defined therethrough. As can be appreciated, a nut or other suitable device may be disposed within the channel and threadably engage a portion of the fastener406ctherein that has been received within a corresponding bore (not shown) defined through the upper surface406eof the base406ato draw or otherwise cause the upper clamp406btowards the base406aand secure a portion of the torque tube of the solar modules1002therebetween.

The upper clamp406bdefines a generally rectangular profile having a planar upper surface406iand an opposite, lower surface406j. A groove406kis formed within the lower surface406jof the upper clamp406band defines a generally concave profile, although it is envisioned that the groove406kmay include any suitable profile, such as triangular, pentagonal, octagonal, amongst others, and in embodiments, may have the same or different profile than that of a torque tube (not shown) of the solar modules1002or the cavity406fof the base406a. The upper clamp406bincludes a pair of throughbores406L defined through the upper and lower surfaces406i,406jthat is configured to receive a portion of the fastener406ctherein. In this manner, the fastener406cis received within the throughbore406L of the upper clamp406band into the channel406gof the base406asuch that a portion of the fastener406cmay threadably engage the nut. Although generally illustrated as being a pair of bolts, it is contemplated that the fastener406cmay be a U-bolt or any other suitable fastener capable of causing the upper clamp406bto be drawn towards the base406aand clamp or otherwise secure the torque tube (not shown) of the solar modules1002therein to ensure that the slew gear bridge400maintains its position relative to the adjacent solar modules1002while stationary as well as when the solar modules1002are caused to be rotated to track the location of the sun.

With reference toFIGS.10-11A, another embodiment of a slew gear bridge is illustrated and generally identified by reference numeral500. The slew gear bridge500includes a pair of parallel beams502, a pair of transverse beams504, and a pair of torque tube clamps506.

Each of the pair of parallel beams502are substantially similar and therefore only one parallel beam502will be described in detail herein in the interest of brevity. The parallel beam502includes an elongate body502aextending between opposed first and second end portions502band502c, respectively. A center portion of the elongate body502adefines an arcuate profile502dto provide clearance for the slew gear (not shown) and/or the antenna (not shown) as the cleaning equipment2000passes over the slew gear bridge500. In embodiments, the elongate body502amay include an arcuate center portion and the first and second end portions502b,502cmay include an arcuate profile enabling a smooth transition of the cleaning equipment2000thereon (FIG.10A). With reference toFIG.10B, it is envisioned that the elongate body502amay have a center portion defining a generally trapezoidal profile. With reference toFIG.10C, it is contemplated that the elongate body502amay be formed from a plurality of beams coupled to one another using any suitable means, such as fasteners, welding, adhesives, amongst others. With reference toFIG.10D, it is envisioned that the elongate beam502amay include a pair of arcuate profiles.

Although generally illustrated as having a rectangular profile, it is contemplated that the parallel beam502may include any suitable profile, such as square, circular, oval, amongst others. In one non-limiting embodiment, the parallel beam502is formed from a rectangular tube (e.g., box tubing or the like) having a hollow interior portion.

Each of the pair of transverse beams504includes an elongate body504aextending between opposed first and second end portions504band504c, respectively. Although generally illustrated as having a planar profile, it is contemplated that the elongate body504aof each of the pair of transverse beams504may include any suitable profile, such as arcuate, triangular, amongst others, and may be the same or different than one another. Although generally illustrated as having a rectangular profile, it is contemplated that the transverse beams504may include any suitable profile, such as square, circular, oval, amongst others. In one non-limiting embodiment, the transverse beams504are formed from a rectangular tube (e.g., box tubing or the like) having a hollow interior portion.

The pair of parallel beams502and the pair of transverse beams504cooperate to form a rectangular space frame to bridge the gap formed between adjacent solar modules1002. In this manner, a first transverse beam504is interposed between the pair of parallel beams502such that the first end portion504bof the first transverse beam504is coupled to a portion of a first parallel beam502adjacent the first end portion502bthereof and the second end portion504cof the first transverse beam504is coupled to a portion of a second parallel beam502adjacent the first end portion502bthereof. The second transverse beam504is coupled to the pair of parallel beams502in a similar manner, although it is contemplated that the pair of parallel beams502and the pair of transverse beams504may be coupled to one another to form any suitable profile. In embodiments, the pair of parallel beams502and the pair of transverse beams504may be coupled to each other by welding, although any suitable method is contemplated, such as adhesives, fasteners, rivets, amongst others.

Continuing withFIGS.10-11B, each of the pair of torque tube clamps506is substantially similar and therefore one only torque tube clamp506will be described in detail herein in the interest of brevity. The torque tube clamp includes a base508and a fastener510operably coupled to the base508. The base508defines a generally inverted U-shaped profile having a base portion508aand a pair of opposed side portions508bdisposed in spaced relation to one another thereon and extending therefrom. Each of the pair of opposed side portions508bdefine a channel508ctherethrough configured to receive a portion of a torque tube (not shown) therein. In this manner, the channel508cdefines a generally U-shaped profile, although it is contemplated that the channel508cmay define any suitable profile, such as circular, oval, elliptical, amongst others, depending upon the profile of the torque tube (not shown) of the solar module1004and the design needs of the slew gear bridge500. In embodiments, the base508may be formed from a pair of brackets508dand508ehaving a generally triangular profile (FIG.11B.

In embodiments, the base508may be fixedly secured to the elongate body504aof the transverse beam504by welding, adhesives, rivets, amongst others. In one non-limiting embodiment, the base508is selectively secured to the elongate body504aof the transverse beam504by the fastener510. The fastener510defines a generally U-shaped configuration that is configured to receive a portion of the torque tube (not shown) therein. In this manner, the torque tube is received within the channel508cof the base508and the fastener510is disposed over the torque tube. A pair of legs510aand510bof the fastener510is received through respective bores of the transverse beam504such that a corresponding pair of nuts510cmay threadably engage a portion of each of the pair of legs510a,510b. As the pair of nuts510care threaded onto the respective pair of legs510a,510bthe fastener510is caused to be drawn towards the base508and clamp or otherwise secure the torque tube (not shown) to the torque tube clamp506to inhibit movement of the slew gear bridge500relative to the torque tube. Although generally described as a U-bolt, it is contemplated that the fastener510may be any suitable fastener, plurality of fasteners, etc. capable of securing the torque tube (not shown) to the base508.

Turning toFIGS.12-15, a row-to-row bridge is illustrated and generally identified by reference numeral600. The row-to-row bridge600includes a pair of parallel beam assemblies610, a pair of transverse beams630, and a pair of torque tube clamps650.

Each of the pair of parallel beam assemblies610is substantially similar and therefore only one parallel beam assembly610will be described in detail in the interest of brevity. The parallel beam assembly610includes an outer tube612, an inner tube614, an insert616, and a pair of coupling assemblies620. The outer tube612includes an elongate body612aextending between opposed first and second end portions612band612c, respectively. The elongate body612adefines a generally square tube profile having an interior channel612ddefined therethrough. The outer tube612includes an end cap612ethat is operably coupled to the first end portion612bof the outer tube612. It is envisioned that the end cap612emay be coupled to the outer tube612using any suitable means, such as friction fit, welding, adhesives, fasteners, amongst others. In one non-limiting embodiment, the end cap612edefines a tongue (not shown) that is configured to be received within a portion of the interior channel612d. A side face612fof the end cap612edefined a cavity612gtherein that is configured to receive a portion of a coupling assembly of the pair of coupling assemblies620, as will be described in further detail hereinbelow.

The inner tube614includes an elongate body614aextending between opposed first and second end portions614band614c, respectively. The elongate body614adefines a generally circular tube profile having an interior channel614ddefined therethrough, although it is contemplated that the elongate body614amay be a solid tubular bar. The inner tube614includes an end cap614ethat is operably coupled to the second end portion614cthereof. The end cap614eis substantially similar to the end cap612e, and therefore the end cap614ewill not be described in detail herein in the interest of brevity.

Continuing withFIGS.14and15, the insert616defines an outer surface616aextending between opposed first and second end surfaces616band616c, respectively. The outer surface616adefines a generally square profile and is configured to be received within the interior channel612dof the outer tube612. As can be appreciated, the outer surface616amay define any suitable profile that is capable of being received within the interior channel612dof the outer tube612and may be the same or different than the interior channel612d. The outer surface616aincludes an annular ridge616ddisposed thereon. The annular ridge616dis configured to abut a portion of the second end portion612cof the outer tube612and inhibit the insert616from being further received within the interior channel612d. In this manner, the location of the annular ridge616don the outer surface616aof the insert612may be varied depending upon the design needs of the row-to-row bridge600. In embodiments, the outer surface616aof the insert616may include a plurality of ridges, fins, or crenellations disposed thereon along the transition from the square profile adjacent the annular ridge616dto the circular profile adjacent the second end surface616c.

The outer surface616aof the insert616transitions from a square profile adjacent the annular ridge616dto a circular profile adjacent the second end surface616c. As can be appreciated, the transition from a circular profile adjacent the second end surface616cto the square profile adjacent the annular ridge616daids in the transition of the cleaning equipment2000from the square sections of the outer tube612to the circular sections of the inner tube614. It is envisioned that the profile of the outer surface616abetween the annular ridge616dand the second end surface616cmay be linear (e.g., horizontal), may be a conical frustum linearly transitioning from a larger outer dimension to a smaller outer dimension (FIG.15A), may define a convex profile (FIG.15B), may define a concave profile (FIG.15C), may define a curvilinear profile (FIG.15D), combinations thereof, amongst others.

In embodiments, the outer surface616aof the insert may include one or more through holes616edefined therethrough that are configured to receive corresponding pins or fasteners618therein. In one non-limiting embodiments, the one or more through holes616eare threaded to threadably engage the corresponding fasteners618and secure the insert616to the outer tube612.

Continuing withFIGS.14and15, the insert616defines a bore616fextending through the first and second end surfaces616b,616c. The bore616fis configured to slidably receive the inner tube614therein. In this manner, the bore616fserves as a linear bushing or bearing to slidably support the inner tube614within the outer tube612. As can be appreciated, the insert616reduces the amount of friction caused by the inner tube614sliding into and out of the outer tube612during operation and acts as a seal to inhibit dirt, dust, and other contaminants from entering the interior channel612dof the outer tube612. In embodiments, the insert616may include one or more a dust seals, gaskets, o-rings, shaft seals, or the like and combinations thereof to inhibit dust, fluid, or other contaminant intrusion into the interior channel612dof the outer tube612.

Returning toFIGS.13and13A, each of the pair of parallel beams includes a corresponding pair of couplings620. Each of the pair of couplings620is substantially similar and therefore only one coupling620will be described in detail herein in the interest of brevity. The coupling620includes a coupler622and a yoke624releasably connected thereto. The coupler622includes an elongate body defining an outer surface622aextending between opposed first and second end portions622band622c, respectively. Although generally illustrated as having a circular profile, it is contemplated that the coupler622may include any suitable profile, such as square, rectangular, oval, hexagonal, amongst others. The coupler622includes an outer dimension that is configured to be received within the cavity612gof the end cap612e. The outer surface622aincludes a first bore622ddefined therethrough adjacent the first end portion622bthat is configured to receive a portion of a pin626therein to couple the coupler622to the end cap612e. Although generally illustrated as being a pin, it is contemplated that the pin626may be any suitable device capable of being received within the first bore622dand coupling the coupler622to the end cap612e, such as a cotter pin, rivet, fastener, amongst others.

Continuing withFIGS.13and13A, the second portion622cdefines a counterbore622etherein that is configured to slidably and rotatably receive a portion of the yoke624therein, as will be described in further detail hereinbelow. The outer surface622aof the coupler622defines an annular slot622ftherethrough adjacent the second end portion622cand into the counterbore622e. The annular slot622fincludes a dimension that is configured to slidably receive a fastener628therein that is selectively coupled to the inner tube614using any suitable means, such as threadable engagement, welding, adhesives, press fit, amongst others. The annular slot622fincludes a length such that in cooperation with the yoke624and a fastener628, the inner tube614is permitted to rotate within the outer tube612up to an angle of approximately 30 degrees. In this manner, the length of the annular slot622fcontrols the amount of rotation of the inner tube614within the outer tube612before the fastener628abuts end portions thereof, and therefore the relative angles at which adjacent tracker modules1002may be placed (e.g., a first tracker module1002may be at a 10-degree angle whereas an adjacent, second tracker module1002may be at a 30-degree angle, etc.). As can be appreciated, limiting the amount of rotation of the inner tube614within the outer tube612inhibits the parallel beam assemblies610from contacting the ground when the solar modules1002are placed at a ±60 degree angle.

The yoke624includes an elongate body624aextending between a first end surface624band an opposite second end portion624c. The first end surface624bincludes a boss624ddisposed thereon and extending therefrom. The boss624ddefines an outer surface624eand includes an outer dimension that is configured to be slidably and rotatably received within the counterbore622eof the coupler622. The outer surface624eof the boss defines a threaded bore624ftherein that is generally aligned with the annular slot622fof the coupler622when the boss624dis received within the counterbore622eof the coupler622. In this manner, the fastener628may be received within the annular slot622fof the coupler622and threadably engage the threaded bore624fof the yoke624to couple the yoke624to the coupler622and inhibit axial movement of the yoke624relative to the coupler622. As can be appreciated, the annular slot622fand the fastener628cooperate to limit rotational movement of the yoke624relative to the coupler622to approximately 30 degrees. Although generally described as being a threaded bore624fand a corresponding threaded fastener628, it is envisioned that the bore624fmay not include threads and rather, may include a smooth interior surface, an annular groove to accommodate a detent on the fastener628(e.g., ball, circlip, etc.), amongst others.

The elongate body624aof the yoke624includes an outer surface624gextending between the first end surface624band the second end portion624c. The elongate body624adefines a generally inverted U-shaped profile defining a cavity624htherein to accommodate a portion of a corresponding transverse beam630therein, as will be described in further detail hereinbelow. Although generally illustrated as having a pair of holes defined therethrough to accommodate a respective pair of fasteners therein to couple the yoke624to the transverse beam630, it is contemplated that the yoke624may be coupled to the transverse beam630using any suitable means, such as welding, adhesives, rivets, fasteners, amongst others.

Returning toFIG.12, the pair of transverse beams630is substantially similar and therefore only one transverse beam630will be described in detail herein in the interest of brevity. The transverse beam630includes an elongate body630adefining a generally U-shaped center profile having a pair of wings630band630cextending therefrom, respectively. In this manner, in a longitudinal direction, the first wing630bincludes a first end portion630dand transitions to a first transverse leg630edisposed generally perpendicularly to the first wing630b. The first transverse leg630etransitions to a center span630fdisposed parallel to the first wing630b. The center span630ftransitions to a second transverse leg630gthat is disposed parallel to the first transverse leg630eand extending in the same direction. The second transverse leg630gtransitions to the second wing630cthat is disposed substantially coaxial with the first wing630band terminates at a second end portion630h. The first end portion630dof the first wing630bis received within the cavity624hof the yoke624of a first parallel beam assembly610using any suitable means, such as fasteners, welding, adhesives, rivets, amongst others. Similarly, the second end portion630hof the second wing630cis received within the cavity624hof the yoke624of a second parallel beam assembly610using any suitable means, such as fasteners, welding, adhesives, rivets, amongst others. As can be appreciated, the second transverse beam630is coupled to the pair of yokes624of respective parallel beam assemblies610in a substantially similar manner to the first transverse beam630. In embodiments, the center span630fof each of the transverse beams630is disposed towards an interior portion of the row-to-row bridge600to provide clearance for the mechanical and electrical components of each adjacent solar module1002.

The row-to-row bridge600is coupled to each of the adjacent solar modules1002using the clamp or other suitable bracket650. In this manner, the brackets650are coupled to a portion of each respective center span630fof the pair of transverse beams630such that rotation of each adjacent solar module1002effectuates a corresponding rotation of the respective transverse beam of the pair of transverse beams630. As can be appreciated, the relationship between the inner tube614and the outer tube612of the pair of longitudinal beam assemblies610permits each adjacent solar module1002to rotate at different angles relative to one another without deforming or otherwise introducing stress into the row-to-row bridge600.

Although generally illustrated as having a generally U-shaped center profile, it is contemplated that each of the transverse beams630may include a linear profile (FIG.12A), an arcuate profile (FIG.12B), a trapezoidal profile having a long center portion (FIG.12C), a trapezoidal profile having a short center portion (FIG.12D), amongst others and any combination thereof.

With reference toFIGS.16-19, a flexible length row-to-row bridge is illustrated and generally identified by reference numeral700. The flexible length row-to-row bridge700includes a pair of parallel beam assemblies710and a pair of transverse beam assemblies730.

Each of the pair of parallel beam assemblies710is substantially similar and therefore only one parallel beam assembly710will be described in detail herein in the interest of brevity. The parallel beam assembly710includes an outer tube712, an inner tube714, an insert716, and a pair of coupling assemblies720. The outer tube712, the inner tube714, and the insert716are substantially similar to the outer tube612, the inner tube614, and the insert616, and therefore only the differences therebetween will be described in detail herein in the interest of brevity.

The first end portion712aof the outer tube712includes a pair of tabs712hand712i, respectively, extending longitudinally therefrom and disposed in spaced relation to one another such that a channel712jis formed therebetween. The second end portion714bof the inner tube714includes a yoke614edisposed thereon and extending longitudinally therefrom. The yoke714edefines a pair of tabs714fand714g, respectively, extending longitudinally therefrom and disposed in spaced relation to one another such that a channel714his formed therebetween. As will be appreciated, the pair of tabs712h,712iand714f,714gcooperate with a respective portion of a respective coupling assembly of the pair of coupling assemblies720, as will be described in further detail hereinbelow.

With reference toFIGS.17,17A, and17B, each of the pair of coupling assemblies720is substantially similar and therefore only one coupling assembly720will be described herein in the interest of brevity. The coupling assembly720includes a universal joint722and a coupler724operably coupled thereto. The universal joint722includes a vertical wall722aextending between upper and lower portions722band722c, respectively and opposed first and second side portions722dand722e, respectively. A first pair of tabs722fis disposed in spaced relation to one another on the vertical wall722aadjacent each respective upper and lower portion722b,722cand extending therefrom. A second pair of tabs722gis disposed in spaced relation to one another on the vertical wall722aadjacent each respective first and second side portions722d,722eand extending therefrom in an opposite direction to that of the first pair of tabs722f. In this manner, a transverse channel722his formed between the first pair of tabs722fand a vertical channel722iis formed between the second pair of tabs722fThe universal joint722includes an outer width that is configured to be slidably received within the channel712jof the outer tube712such that the pair of tabs712hand712iare rotatably coupled to the second pair of tabs722fusing any suitable means, such as fasteners, rivets, cotter pins, amongst others. Although generally described as having the first pair of tabs722fbeing received within the channel712jof the outer tube712, it is contemplated that the pair of tabs712hand712iof the outer tube712may be slidably received within the vertical channel722iof the universal joint722. As can be appreciated, the second pair of tabs722fof the universal joint cooperate with the pair of tabs712h,712iof the outer tube to permit vertical rotation of the universal joint722relative to the outer tube712.

Continuing withFIG.17B, the coupler724includes an elongate body724aextending between opposed first and second end portions724band724c, respectively. A pair of tabs724dis disposed in spaced relation to one another adjacent the second end portion724cof the coupler724and extends therefrom. In this manner, the pair of tabs724ddefine a transverse channel724etherebetween that is configured to slidably receive the first pair of tabs722fof the universal joint722. The first pair of tabs722fand the pair of tabs724dof the coupler724are rotatably coupled to one another using any suitable means, such as fasteners, rivets, cotter pins, amongst others. In one non limiting embodiment, the first pair of tabs722fand the pair of tabs724dof the coupler724are rotatably coupled to one another using a pin. Although generally described as having the first pair of tabs722fof the universal joint being slidably received within the transverse channel724eof the coupler724, it is contemplated that the transverse channel722hof the universal joint722may slidably receive the pair of tabs724fof the coupler724. The elongate body724aof the coupler724includes an outer dimension that is configured to be slidably received within a portion of an end cap734of the transverse beam assembly such that the coupler724is coupled to the end cap734, as will be described in further detail herein below.

With reference toFIGS.16,18, and19, each of the transverse beam assemblies730is substantially similar and therefore only one transverse beam assembly730will be described in detail herein in the interest of brevity. The transverse beam assembly730includes a center beam732, a pair of detent mechanisms736, and a pair of end caps734.

The center beam732includes an elongate body732aextending between opposed first and second end portions732band732c, respectively. Although generally illustrated as being a linear box beam (e.g., a hollow, square profile), it is contemplated that the elongate body732amay include any suitable profile, such as rectangular, circular, oval, amongst others, and may be hollow or solid, depending upon the design needs of the row-to-row bridge700. In one non-limiting embodiment, the elongate body732aincludes a cavity732ddefined through each of the first and second end portions732b,732cand extending therethrough. An upper surface732eof the elongate body732aincludes a pair of bores732fdefined therethrough adjacent each respective first and second end portions732b,732cthat is configured to selectively engage a portion of a respective detent mechanism736, as will be described in further detail hereinbelow.

With continued reference toFIGS.18and19, and with additional reference toFIG.19A, each of the pair of detent mechanisms736is substantially similar and therefore only one detent mechanism736will be described in detail herein in the interest of brevity. The detent mechanism736includes a resilient member736ahaving a generally V-shaped profile defining first and second legs736band736c, respectively, joint at a crown736d. Each of the first and second legs736b,736cextends from the crown736din a splayed manner (e.g., outward or away from one another in a non-parallel fashion). The resilient member736ais formed from a resilient material capable of being deformed as a force is applied to one or both of the first and second legs736b,736c(e.g., compressed towards one another) and returning to its original shape (e.g., elastically deformed). An upper surface736eof the first leg736bincludes a button or ball736fdisposed thereon using any suitable means, such as welding, adhesives, fasteners, amongst others. The button736fis configured to selectively engage a bore of the pair of bores732fof the center beam732to selectively couple the detent mechanism736to the center beam732, as will be described in further detail hereinbelow. It is envisioned that the detent mechanism may be any suitable button pin, snap button, tubing button, etc. that is capable of selectively retaining the center beam732to the pair of end caps734.

In operation, as the detent mechanism736is advanced within the cavity732dadjacent a respective first or second end portion732b,732cof the center beam732, the button736fand a portion of the second leg736cabuts or otherwise contacts a portion of the center beam732. As the detent mechanism736is caused to be further advanced within the cavity732d, the first and second legs736b,736cof the detent mechanism736are caused to be compressed towards one another. Further advancement of the detent mechanism736within the cavity732dcauses the button736fto be received within the bore732fof the center beam732and protrude past the upper surface732e. As can be appreciated, the button736fof the detent mechanism and the bore732fof the center beam cooperate to selectively couple the detent mechanism736to the center beam732. In this manner, compression of the button736ftowards the second leg736cof the detent mechanism736causes the button736fto be depressed below the upper surface732eof the center beam732into the cavity732d, thereby releasing the button736ffrom the bore732fand permitting the detent mechanism736to slide relative to the center beam732and be removed therefrom. Although generally described as having a detent mechanism736, it is envisioned that the length of the transverse beam assembly730may be selectively fixed using fasteners736g(FIG.19B).

Continuing withFIGS.18and19, each of the pair of end caps734is substantially similar and therefore only one end cap734will be described in detail herein in the interest of brevity. The end cap734includes a generally T-shaped profile having a stem734aand a cross-beam734bcoupled to the stem734aat a generally perpendicular angle thereto. It is contemplated that the stem734aand the cross-beam734bmay be coupled to one another using any suitable means, such as welding, adhesives, fasteners, amongst others. Each of the stem734aand the cross-beam734bdefine a generally square profile having a hollow interior portion734cdefined therein. As can be appreciated, the hollow interior portion734cincludes a profile that is similar to the profiles of the center beam732and the coupler724. In this manner, the hollow interior portion734cincludes an inner dimension that is configured to slidably receive a portion of each of the center beam732and the coupler724. It is envisioned that the stem734aand the cross-beam734bmany include any suitable outer profile, such as square, rectangular, circular, oval, amongst others and may include the same or different outer profile, as long as the profile of the hollow interior portion734cis capable of slidably receiving a portion of each of the center beam732and the coupler724therein.

An upper surface734dof the stem734aincludes a plurality of holes734edefined therethrough that is configured to releasably engage the button736fof the detent mechanism736. In this manner, as the center beam732is slidably advanced within the hollow interior portion734cof the stem734a, the button736eis caused to compress or otherwise urged towards the second leg736cto permit further advancement of the center beam732therein. Further advancement of the center beam732within the hollow interior portion734cof the stem734acauses the button736fto be received in a first hole of the plurality of holes734eand be releasably retained therein and selectively couple the center beam732to the end cap734. With the button736freceived within the first hole of the plurality of holes734e, the center beam732is inhibited from translating relative to the end cap734, thereby maintaining an overall length of the transverse beam assembly730. The button736fof the detent mechanism736and the plurality of holes734ecooperate to permit adjustment of the length of the transverse beam assembly730. In this manner, the button736fmay be depressed to release the button736ffrom a hole of the plurality of holes734eof the stem and the end cap734may be translated relative to the center beam736to increase or decrease the length of the transverse beam assembly714until the button736fis received within another hole of the plurality of holes734d. As can be appreciated, this process may be repeated as many times as necessary to achieve the desired length of the transverse beam assembly730. In this manner, the flexible length row-to-row bridge700may be utilized with solar modules1002of various sizes by adjusting the length of the transverse beam assembly730to substantially match the size of the adjacent solar module1002.

Turning now toFIGS.20and21, a fixed length return station is illustrated and generally identified by reference numeral800. The fixed length return station800includes a pair of parallel beams802, a pair of transverse beams804, a vertical beam806, and a pair of mounting brackets808. The pair of parallel beams802are substantially similar to one another and define an elongate body extending between opposed first and second end portions802aand802b, respectively. Although generally illustrated as having a square profile, it is contemplated that the pair of parallel beams802may include any suitable profile, such as circular, oval, octagonal, amongst others, any may be solid or have a hollow interior portion.

The pair of transverse beams804includes a first transverse beam804aand a second transverse beam804b. Each of the first and second transverse beams804a,804binclude a generally square profile, although it is contemplated that the first and second transverse beams804a,804bmay include any suitable profile, such as circular, oval, octagonal, amongst others, may be the same or different to one another, and may be solid or have a hollow interior portion. The first transverse beam804ais interposed between the pair of parallel beams802such that the pair of parallel beams802is disposed in spaced relation to one another and at a generally perpendicular angle to the first transverse beam804a. It is contemplated that the first transverse beam804amay be coupled to each of the pair of parallel beams802by any suitable mans, such as welding, adhesives, fasteners, amongst others. The second transverse beam804bincludes an elongate body extending between opposed first and second end portions804cand804d, respectively. The second transverse beam804bincludes an overall length such that each of the first and second end portions804cand804dextend past the pair of parallel beams802. In this manner, the second end portion802bof each of the pair of parallel beams802intersects a portion of the elongate body of the second transverse beam804band is coupled thereto using any suitable means, such as welding, adhesives, fasteners, amongst others.

The vertical beam806is disposed on an upper portion of the elongate body of the second transverse beam804band extends therefrom. Although generally illustrated as having a square profile, it is contemplated that the vertical beam806may include any suitable profile, such as circular, oval, octagonal, amongst others, and may include the same or different profile to that of the pair of parallel beams802and the pair of transverse beams804. It is envisioned that the vertical beam806may be coupled to the second transverse beam804busing any suitable means, such as welding, adhesives, fasteners, amongst others. The vertical beam806is disposed on the second transverse beam804bat a location that is in between each of the pair of parallel beams802such that the vertical beam806is permitted to inhibit movement of the cleaning equipment2000therepast (e.g., act as a positive stop for the cleaning equipment2000).

The pair of brackets808includes as first bracket808acoupled to a portion of the first transverse beam804aand a second bracket808bcoupled to a portion of the second transverse beam804b. The pair of brackets808is configured to couple the fixed length return station800to a torque tube extension1004that is operably coupled to a torque tube of the adjacent solar module1002. It is envisioned that the pair of brackets808may be any of the brackets described herein capable of coupling the fixed length return station800to the torque tube extension1004and inhibiting translation and rotation of the fixed length return station800relative thereto. As can be appreciated, the fixed length return station800enables the cleaning equipment2000to fully clean the adjacent solar module1002and enable the cleaning equipment2000to sense that it has reached an end of the solar module1002and must travel in the opposite direction to reach its docking station.

With reference toFIGS.22-23B, a flexible length return station is illustrated and generally identified by reference numeral900. The flexible length return station900includes a pair of parallel beams902, a pair of transverse beams910, and a pair of vertical beams920.

Each of the pair of parallel beams902is substantially similar and therefore one parallel beam902will be described in detail herein in the interest of brevity. The parallel beam902includes an elongate body extending between opposed first and second end portions902aand902b, respectively. A side surface902cof the elongate body includes a channel904defined therethrough and extending within a hollow cavity906defined therewithin. The channel904includes a width that is less than a width of the side surface902cof the elongate body end extends longitudinally through each of the first and second end portions902a,902b. In embodiments, the parallel beam902may be formed from Unistrut® or any other suitable structural framing material having similar construction. Although generally illustrated as having a square profile, it is contemplated that the parallel beam902may include any suitable profile, such as rectangular, oval, circular, amongst others.

The parallel beam902includes an end bracket908(FIG.23A) releasably coupled thereto adjacent the second end portion902b. The end bracket908includes an elongate body extending between opposed first and second end portions908aand908b, respectively. In embodiments, the elongate body of the end bracket908may define the same or similar profile as the parallel beam902. The elongate body includes a cavity (not shown) defined through the first end portion908aand extending through the second end portion908b. The cavity is configured to receive the second end portion902bof the parallel beam902therein such that the end bracket908is coupled thereto using any suitable means, such as welding, adhesives, fasteners, amongst others.

It is envisioned that the end bracket908may include a channel defined through a side surface thereof, and in embodiments, no channel may be defined therethrough. The second end portion908bof the end bracket908includes a plate908ccoupled thereto and having a generally planar profile, although it is contemplated that any suitable profile may be utilized. The plate908cis coupled to the second end portion908bat a generally perpendicular angle and includes a width that is greater than that of the elongate body of the end bracket908. It is envisioned that the plate908cmay be coupled to the end bracket908using any suitable means, such as welding, adhesives, fasteners, amongst others. It is envisioned that the end bracket908may be coupled to the parallel beam902using any suitable means, such as welding, adhesives, fasteners, amongst others. In one non-limiting embodiment, the end bracket908is coupled to the parallel beam902using channel nuts compatible with Unistrut® framing.

With continued reference toFIGS.22-23B, the pair of transverse beams910includes a first transverse beam912and a second transverse beam914. Although generally illustrated as having a shorter length than the second transverse beam914, it is contemplated that the first transverse beam912may include a length that is the same or greater than the second transverse beam914. The first and second transverse beams912,914includes a similar profile to one another and to that of the parallel beam902, although it is contemplated that the first and second transverse beams912,914may include any suitable profile and may have the same or different profile than one another or the parallel beam902. In one non-limiting embodiment, the first and second transverse beams912,914may be formed from Unistrut® or any other suitable structural framing material having similar construction. The second transverse beam914is releasably coupled to an end bracket908of a respective parallel beam902using any suitable means, such as fasteners, adhesives, welding, amongst others, and in one non-limiting embodiment, is coupled to the end bracket908using channel nuts compatible with Unistrut® framing.

The first transverse beam912includes a pair of end brackets916releasably coupled thereto using any suitable means, such as welding, adhesives, fasteners, amongst others. In one non-limiting embodiment, the pair of end brackets916is releasably coupled to the first transverse beam using channel nuts compatible with Unistrut® framing. Each of the pair of end brackets916is substantially similar and therefore only one end bracket916will be described in detail herein in the interest of brevity.

The end bracket916includes an elongate body916aextending between opposed first and second end portions916band916c, respectively. It is envisioned that the end bracket916may include a channel defined through a side surface thereof, and in embodiments, no channel may be defined therethrough. The first end portion916bof the end bracket916includes a plate916dcoupled thereto and having a generally planar profile, although it is contemplated that any suitable profile may be utilized. The plate916dis coupled to the first end portion916bat a generally perpendicular angle and includes a width that is greater than that of the elongate body of the end bracket916. It is envisioned that the plate916dmay be coupled to the end bracket916using any suitable means, such as welding, adhesives, fasteners, amongst others. It is envisioned that the end bracket916may be coupled to the first transverse beam912using any suitable means, such as welding, adhesives, fasteners, amongst others. In one non-limiting embodiment, the end bracket916is coupled to the first transverse beam912using channel nuts compatible with Unistrut® framing. The plate916dis configured to be releasably coupled to a respective parallel beam of the pair of parallel beams adjacent the first end portion902athereof. In embodiments, the end bracket916is coupled to the first transverse beam912using channel nuts compatible with Unistrut® framing. In this manner, the end bracket916releasably couples the first transverse beam912to the respective parallel beam902at a substantially perpendicular angle, although it is contemplated that the first transverse beam and the parallel beam902may be joined at any suitable angle.

As can be appreciated, by permitting the first transverse beam912to be slidably received within a portion of the end bracket916before selectively securing the end bracket916thereto, the overall length of the first transverse beam912, and thereby the overall length of the flexible length return station900may be varied to accommodate differing sizes of solar modules1002. In one non-limiting embodiment, the overall length of the flexible length return station900may be varied between 2000 mm and 2400 mm.

Continuing withFIGS.22-23B, each of the pair of vertical beams920is substantially similar and therefore only one vertical beam920will be described in detail herein in the interest of brevity. The vertical beam920includes an elongate body920aextending between opposed first and second end portions920band920c, respectively. It is envisioned that in embodiments, a channel may be defined through a side surface of the elongate body920a. In embodiments, the parallel beam vertical beam920may be formed from Unistrut® or any other suitable structural framing material having similar construction. Although generally illustrated as having a square profile, it is contemplated that the vertical beam920may include any suitable profile, such as rectangular, oval, circular, amongst others. The vertical beam920includes a bracket922disposed thereon adjacent the second end portion920b. It is contemplated that the bracket922may be coupled to the vertical beam920using any suitable means, such as welding, adhesives, fasteners, amongst others. The bracket922is coupled to the vertical beam920such that the bracket922forms a generally perpendicular angle thereto.

The bracket922defines a generally inverted U-shaped profile that is configured to receive a portion of the second transverse beam914therein. In embodiments, the bracket922may include a planar profile, C-shaped profile, amongst others. The bracket922is coupled to the second transverse beam914using any suitable means, such as welding, adhesives, fasteners, amongst others. In one non-limiting embodiment, the bracket922is coupled to the second transverse beam914using channel nuts compatible with Unistrut® framing. In this manner, the location at which the vertical beam920is located on the length of the transverse beam914may be varied before tightening or otherwise fastening the vertical beam920thereto.

As can be appreciated, the pair of vertical beams920act as a stop or other mechanical feature to inhibit the cleaning equipment2000from traversing past the end of the flexible length return station900. Although generally described as being a pair of vertical beams920, it is contemplated that only one vertical beam920may be utilized or more than two vertical beams920may be utilized depending upon the design needs of the flexible length return station900.

Turning toFIGS.24-25, a collapsible bridge is illustrated and generally identified by reference numeral1100. The collapsible bridge1100includes first and second parallel beams1102and1104disposed in spaced relation to one another and extending between respective first and second end portions1102a,1102band1104a,1104b, respectively. The collapsible bridge1100includes first and second transverse beams1106and1108extending between respective first and second end portions1106a,1106band1108a,1108b, respectively. The first transverse beam1106is interposed between the first and second parallel beams1102,1104such that the first end portion1106ais disposed adjacent to the first end portion1102aof the first parallel beam and the second end portion1106bis disposed adjacent to the first end portion1104aof the second parallel beam1104. Similarly, the second transverse beam1108is interposed between the first and second parallel beams1102,1104such that the first end portion1108ais disposed adjacent to the second end portion1102bof the first parallel beam1102and the second end portion1108bis disposed adjacent to the second end portion1104bof the second parallel beam1104. Although generally illustrated as defining a square profile, it is contemplated that each of the first and second parallel beams1102,1104and the first and second transverse beams1106,1108may include any suitable length, and may define any suitable profile, such as rectangular, trapezoidal, oval, amongst others.

Each of the first and second transverse beams1106and1108include a respective mounting bracket1110coupled thereto using any suitable means, such as welding, fasteners, adhesives, amongst others. The mounting brackets1110are substantially similar to first bracket250a(FIG.5A), and therefore, the mounting bracket1110will not be described in detail herein in the interest of brevity. Although generally described as being coupled to the first and second transverse beams1106,1108, it is envisioned that the mounting brackets1110may be coupled to each of the first and second parallel beams1102,1104. As can be appreciated, the mounting brackets1110are configured to selectively couple the collapsible bridge1100to a torque tube of a solar modules1002or the like.

The collapsible bridge1100includes a plurality of hinges1112(FIG.24A) disposed adjacent each of the intersection of the first end portion1102aand first end portion1106a, the second end portion1102band the first end portion1108a, the second end portion1106band the first end portion1104a, and the second end portion1104band the second end portion1108b, respectively. The plurality of hinges1112may be coupled to each of the first and second parallel beams1102,1104and the first and second transverse beams1106,1108using any suitable means, such as fasteners, welding, adhesives, amongst others. As can be appreciated, the plurality of hinges1112enable each of the first and second parallel beams1102,1104and the first and second transverse beams1106,1108to rotate with respect to one another from a first, expanded position (FIG.24), to a second, collapsed position, in which each of the first and second parallel beams1102,1104and first and second transverse beams1106,1108are parallel to one another (FIG.24B). It is envisioned that the plurality of hinges1112may be any suitable type of hinge capable of permitting the collapsible bridge to transition from the first, expanded position to the second, collapsed position.

Turning toFIGS.26-38, another embodiment of a flexible length row-to-row bridge is illustrated and generally identified by reference numeral1200. The flexible length row-to-row bridge1200includes a pair of transverse beam assemblies1210and a pair of parallel beam assemblies1240.

Each of the pair of transverse beam assemblies1210is substantially similar to one another and therefore, only one transverse beam assembly of the pair of transverse beam assemblies1210will be described herein in the interest of brevity. The transverse beam assembly1210includes an elongate body1212and a coupling assembly1220operably coupled to a portion of the elongate body1212, as will be described in further detail hereinbelow. The elongate body1212includes an outer surface1212aextending between opposed first and second end portions1212band1212c, respectively. Although generally described has having a rectangular profile, it is envisioned that the elongate body1212may include any suitable profile, such as circular, oval, rectangular, hexagonal, amongst others. The elongate body includes an inner surface1214defining a throughbore1214aextending through each of the first and second end portions1212b,1212c, respectively, although it is contemplated that the throughbore1212amay only extend partially within the elongate body1212through one or both of the first and second end portions1212b,1212c. The elongate body1212includes a pair of bores1216defined through the outer surface1212athat is configured to selectively receive a portion of a fastener of the coupling assembly1220therethrough. Each of the pair of bores1216is disposed adjacent a respective one of the first and second end portions1212b,1212cand extending through the entirety of the elongate body1212, although it is contemplated that one or both of the pair of bores1216may extend partially through the elongate body depending upon the design needs of the flexible length row-to-row bridge1200.

With reference toFIG.29, the coupling assembly1220includes a coupling block1222, a swivel joint1228and a fastener1230. The coupling block1222includes opposed top and bottom surfaces1222aand1222b, respectively, each extending between opposed first and second end surfaces1222cand1222d, respectively and opposed first and second side surfaces1222eand1222f, respectively, each extending between each of the top and bottom surfaces1222a,1222band the first and second end surfaces1222c,1222d. The coupling block1222includes a profile that generally corresponds to the profile of the throughbore1214aof the elongate body such that the coupling block1222can be slidably received therein, although it is contemplated that the coupling block1222may include any suitable profile depending upon the design needs of the flexible length row-to-row bridge1200. The coupling block1222includes an aperture1224defined through each of the top and bottom surfaces1222a,1222bthat is configured to selectively receive a portion of the fastener1230to selectively couple the coupling block1222to the elongate body1212. A threaded shaft1226is operably coupled to a portion of the first end surface1222cof the coupling block1222at a center portion thereof, although it is contemplated that the threaded shaft1226may be disposed at any suitable location on the first end surface1222c. It is envisioned that the threaded shaft1226may be coupled to the first end surface1222cof the coupling block1222using any suitable means, such as being threadably engaged, fasteners, welding, adhesives, formed as a unitary component via machining, additive manufacturing, etc.

The coupling block1222is selectively coupled to the elongate body1212by the fastener1230. In this manner, the coupling block1222is received within the throughbore1214aof the elongate body1212such that the aperture1224is generally aligned with a respective bore of the pair of bores1216. With the aperture1224and the bore1216in general alignment, the fastener1230is advanced within the throughbore1214aand the aperture1224to selectively retain the coupling block1222to the elongate body1212. It is envisioned that the fastener1230may be a bolt and nut assembly, a bolt threadably engaging a portion of the coupling block and/or the elongate body1212. In embodiments, the coupling block1222may be coupled to the elongate body1212by rivets, adhesives, welding, amongst others.

The swivel joint1228is a female heim joint or spherical rod end that is configured to threadably engage a portion of the threaded shaft1226to couple the swivel joint1228to the coupling block1222. The swivel joint1228includes a hole1228adefined through a portion of the bearing portion thereof to selectively retain a portion of parallel beam of the pair of parallel beam assemblies1240thereto to permit radial misalignment of the parallel beam assembly1240relative to the transverse beam assembly1210, as will be described in further detail hereinbelow. Although generally described as being a female heim joint, it is envisioned that the swivel joint1228may be a male heim joint that is configured to threadably engage a portion of the coupling block1222in lieu of the threaded shaft1226. In embodiments, the swivel joint1228may be coupled to the coupling block1222by welding, adhesives, fasteners, amongst others. As can be appreciated, a coupling assembly1220is coupled to each respective first and second end portion1212band1212cof the elongate body1212.

With reference toFIGS.30-35, each of the pair of parallel beam assemblies1240is substantially similar to one another and therefore, only one parallel beam assembly of the pair of parallel beam assemblies1240will be described herein in the interest of brevity. The parallel beam assembly1240includes an extension assembly1242and an end-cap assembly1270coupled to respective portions of the extension assembly1242, as will be described in further detail hereinbelow.

The extension assembly1242includes a plurality of nested beams configured to be nested within one another in a first, collapsed condition, and extend from one another in a second, expanded condition, along a longitudinal axis A-A to accommodate adjacent solar modules1002that are placed at angles that are different from one another (e.g., a first solar module1002is caused to be placed in a first angle and a second, adjacent solar module1002is caused to be placed in a second angle that is different than the first angle due to a location of the sun relative to the first and second solar modules). In this manner, the extension assembly1242includes a center beam1244, a pair of intermediate beams1246, and a pair of outer beams1260. The center beam1244includes an outer surface1244aextending between opposed first and second end portions1244band1244c, respectively. Although generally illustrated as having a circular cross-sectional profile, it is envisioned that the center beam1244may include any suitable cross-sectional profile, such as square, oval, rectangular, hexagonal, amongst others. Each of the first and second end portions1244b,1244cof the center beam1244is swaged or otherwise includes an upturned flange1244d(FIG.32) extending radially outward from the outer surface1244athat is configured to operably engage a corresponding feature formed in each of the pair of intermediate beams1246to limit or otherwise control a distance the intermediate beams1246may be extended from the center beam1244, as will be described in further detail herein below.

Each of the pair of intermediate beams1246is substantially similar to each other and therefore, only one intermediate beam of the pair of intermediate beams1246will be described in detail herein in the interest of brevity. The intermediate beam1246includes generally circular cross-sectional profile having an outer surface1246aextending between opposed first and second end portions1246band1246c, respectively. Although generally described as having a circular cross-sectional profile, it is envisioned that the intermediate beam1246may include a cross-sectional profile that is generally the same or different than the cross-sectional profile of the center beam1244.

The intermediate beam1246includes an inner surface1248defining a throughbore1248aextending through each of the first and second end portions1246b,1246c, respectively. The throughbore1248aincludes an inner dimension that is substantially equal to or greater than an outer dimension of the upturned flange1244dof the center beam1244such that the intermediate beam1246is permitted to slidably receive the center beam1244within the throughbore1248a. The first end portion1246bof the intermediate beam1246includes an upturned flange1246ddisposed on the outer surface1246athat is substantially similar to the upturned flange1244dof the center beam1244described hereinabove. The upturned flange1246dis configured to engage or otherwise abut a corresponding feature formed in the outer beam1260to limit or otherwise control a distance the outer beam1260may be extended from the intermediate beam1246, as will be described in further detail hereinbelow.

The intermediate beam1246includes a bushing or bearing1250(FIGS.32and33) operably coupled to the second end portion1246cthereof. The bushing1250includes a generally top-hat configuration having a tubular portion1252including an outer surface1252aextending between opposed first and second end portions1252band1252c, respectively. The outer surface1252aincludes a flange1254disposed therein and extending radially therefrom and is disposed adjacent the second end portion1252c. The bushing1250includes an inner surface1256defining a bore1256aextending through each of the first and second end portions1252b,1252c, respectively. The outer surface1252aof the tubular portion1252of the bushing1250is approximately the same or less than the inner dimension of the throughbore1248aof the intermediate beam1246such that the tubular portion1252of the bushing1250is permitted to be slidably received within the throughbore1248auntil a portion of the flange1254abuts the second end portion1246cof the intermediate beam1246an inhibits further advancement of the bushing within the throughbore1248a.

An outer dimension of the flange1254is substantially the same or less than an outer dimension of the intermediate beam1246. An inner dimension of the bore1256aof the bushing1250is substantially similar to or greater than the outer dimension of the center beam1244such that a portion of the center beam1244is permitted to be slidably received therein. It is envisioned that the bushing1250may be selectively or permanently coupled to the intermediate beam1246using any suitable means, and in one non-limiting embodiment, is selectively coupled to the intermediate beam1246via one or more fasteners, such as a screw, amongst others. The bushing may be formed from any suitable material, such as a polymer, a ceramic, a metallic material, amongst others. As can be appreciated, the bushing1250minimized friction caused be the center beam1244sliding relative to the intermediate beam1246, and vice versa, and minimizes radial misalignment of the center beam1244relative to the intermediate beam1246. In operation, the first end portion1252bis configured to abut or otherwise engage a portion of the upturned flange1244dof the center beam to inhibit further movement of the inner beam1244relative to the outer beam1246, and vice versa.

With reference toFIGS.36-38, it is envisioned that the parallel beam assembly1240may not include a bushing1250, and rather, the outer surface1246aof the intermediate beam1246may be crimped or otherwise deformed to create one or more protuberances1302extending into the throughbore1248aof the intermediate beam to engage or otherwise abut a portion of the upturned flange1244dof the center beam1244. Although generally described as being one or more protuberances, it is envisioned that the one or more protuberances1302may be a continuous annular boss, amongst others. In embodiments, in addition to the one or more protuberances1302, the intermediate beam may include a downturned U-shaped profile1304(FIG.37) adjacent the second end portion1246cthat is configured to capture a plurality of balls or spherical rollers1306therein (FIG.38). In this manner, with the center beam1244received within the throughbore1248aof the intermediate beam1246, the plurality of spherical rollers1306abut or otherwise contact a portion of the outer surface1244aof the center beam1244to reduce or otherwise minimize friction between the center beam1244and the intermediate beam1246.

Returning toFIGS.30-33and with additional reference toFIGS.34and35, each of the pair of outer beams1260is substantially similar to one another and therefore only one outer beam of the pair of outer beams1260will be described herein in the interest of brevity. The outer beam1260includes a generally circular cross-sectional profile having an outer surface1260aextending between opposed first and second end portions1260band1260c, respectively. Although generally described as having a circular cross-sectional profile, it is envisioned that the outer beam1260may include a cross-sectional profile that is generally the same or different than the cross-sectional profile of the center beam1244and/or the intermediate beam1246. The outer beam1260includes an inner surface1262defining an aperture1262aextending through each of the first and second end portions1260b,1260c, respectively. The aperture1262aincludes an inner dimension that is substantially equal to or greater than the outer dimension of the upturned flange1246dof the intermediate beam1246such that the outer beam1260is permitted to slidably receive a portion of the intermediate beam1246within the aperture1262a.

The outer beam1260includes a bushing1250disposed within the aperture1262aadjacent the second end portion1260cthat serves substantially the same purpose of the bushing1250disposed within the intermediate beam1246. The outer beam1260includes a hole1264defined through the outer surface1260aadjacent the first end portion1260bthat is configured to receive a portion of the second fastener1300of the end-cap assembly1270, as will be described in further detail hereinbelow.

With reference toFIGS.34and35, the end-cap assembly1270includes a coupling block1272, a first fastener1290, and a second fastener1300. The coupling block1272defines a generally circular cross-sectional profile having an outer surface1272aextending between opposed first and second end portions1272band1272c, respectively. The outer surface1272aof the coupling block1272includes an outer dimension that is substantially equal to or less than the inner dimension of the aperture1262asuch that the first end portion1272bof the coupling block1272is permitted to be slidably received within the aperture1262aadjacent the first end portion1260bof the outer beam1260. The outer surface1272aof the coupling block1272includes an annular flange1274disposed thereon and extending radially therefrom. Although generally illustrated as having an outer dimension that is substantially equal to the outer dimension of the outer beam1260, it is envisioned that the annular flange1274may include any suitable outer dimension that inhibits further advancement of the coupling block1272within the aperture1262aof the outer beam1260. The coupling block1272includes a generally frusto-conical profile1276extending from the annular flange1274towards the second end portion1272c. In this manner, the outer dimension of the coupling block1272decreases from the outer dimension of the annular flange1274towards the second end portion1272c, although it is contemplated that coupling block1272may include any suitable profile between the annular flange1274and the second end portion1272c.

The coupling block1272includes a first inner surface1278defining a bore1278aextending through each of the first and second end portions1272b,1272c, respectively, that is configured to receive a portion of the first fastener1290therethrough, as will be described in further detail hereinbelow. The coupling block1272includes a second inner surface1280defining a transverse bore1280athat extends through the outer surface1272asuch that a portion of the second fastener1300is permitted to be received therein, as will be described in further detail hereinbelow.

It is envisioned that the first fastener1290may be any suitable fastener, such as a carriage bolt, a hex bolt, a button head, a cap screw, amongst others. The first fastener1290includes a head1292and a shank1294disposed thereon and extending longitudinally therefrom. The shank1294includes an outer dimension that is configured to be slidably received within the bore1278aof the coupling block1272such that a portion of the head1292abuts or otherwise contacts a portion of the first end portion1272bof the coupling block to inhibit further advancement of the first fastener1290therethrough. The shank1294includes a transverse hole1294adefined therethrough that is configured to receive a portion of the second fastener1300therethrough.

In this manner, with the first fastener1290received within the bore1278of the coupling block1272and the head1292abutting the first end portion1272b, the transverse bore1280aof the coupling block1272and the transverse hole1294aof the first fastener1290are substantially aligned with one another. At this point, the coupling block1272is advanced within the aperture1262aadjacent the first end portion1260bof the outer beam1260until the annular flange1274abuts or otherwise contacts the first end portion1260bof the outer beam1260to inhibit further advancement of the coupling block1272within the aperture1262a. In this position, the hole1264of the outer beam1260, the transverse bore1280aof the coupling block1272, and the transverse hole1294aof the first fastener1290are substantially aligned with one another such that second fastener1300may be advanced within each of the hole1264, the transverse bore1280a, and the transverse hole1294ato secure or otherwise couple the coupling block1272and the first fastener1290to the outer beam1260and inhibit rotation and translation of the coupling block1272and the first fastener1290relative to the outer beam1260. The shank1294of the first fastener1290is configured to be received within the bore1228aof the swivel joint1228and coupled thereto using a nut1296or other suitable fastening device (FIG.35).

Returning toFIGS.26and27, in operation, each respective transverse beam assembly1210is coupled to a respective solar module1002. When the adjacent solar modules1002are oriented at the same or substantially the same angle relative to one another, the flexible length row-to-row bridge1200is placed in the first collapsed condition (FIG.30) such that each of the center beam1244, the pair of intermediate beams1246, and the pair of outer beams1260are in a nested configuration. In the collapsed condition, the length of the pair of parallel beams1240(e.g., extending in a longitudinal direction across the solar modules1002), can be approximately 700 mm. As one solar module1002is caused to be rotated relative to an adjacent solar module1002, the pair of outer beams1260is caused to be drawn away from one another causing one or both of the outer beams1260to translate relative to one or both of the intermediate beams1246and the center beam1244to expand one or both of the pair of parallel beam assemblies1240(FIG.31). As can be appreciated, one parallel beam assembly of the pair of parallel beam assemblies1240may expand at a faster rate than the other. In this manner, the swivel bearing1228accommodates an angular misalignment of the adjacent solar modules1002of up to approximately +/−60 degrees. Continued misalignment of the adjacent solar modules1002causes one or both of the pair of parallel beam assemblies1240to continue to expand. It is envisioned that the pair of parallel beam assemblies1240can accommodate extension up to approximately 1625 mm.