Assembly and method for preventing personnel from being exposed to an opening defined by a wind turbine surface

Abstract

A component and method for preventing a person from being exposed to an opening defined by the surface of a wind turbine are provided. Accordingly, a hatch assembly is arranged adjacent to the opening. The hatch assembly includes a frame structure and a support structure. The frame structure includes a plurality of frame members that are arranged together to at least partially surround the opening, and the plurality of frame members also define a channel for receiving a support surface. The support surface is capable of sliding between a first position and a second position. When the support surface is in the first position, the support surface seals the opening defined by the surface of the wind turbine, and when in the second position, the support surface blocks the channel defined by the plurality of frame members to prevent a person from being exposed to the opening.

Description

Technical Field

[0001] The present disclosure generally relates to wind turbines, and more particularly to components and methods for preventing personnel from being exposed to openings defined by the surfaces of wind turbines. Background Art

[0002] Wind power is considered one of the cleanest and most environmentally friendly energy sources currently available, and wind turbines have received increasing attention in this regard. Modern wind turbines typically include a tower, a generator, a gearbox, a nacelle, and one or more rotor blades. The nacelle includes a rotor assembly coupled to the gearbox and the generator. The rotor assembly and the gearbox are mounted on a baseplate support frame located within the nacelle. One or more rotor blades capture the kinetic energy of the wind using known airfoil principles. The rotor blades transfer the kinetic energy in the form of rotational energy to rotate a shaft that couples the rotor blades to the gearbox, or directly to the generator if a gearbox is not used. The generator then converts the mechanical energy into electrical energy, which can be transmitted to a converter and / or transformer housed within the tower and subsequently deployed to the utility grid.

[0003] To access various parts of a wind turbine, openings may be defined within the surface of the wind turbine. Typically, these openings may be positioned to allow personnel and / or cargo to pass therethrough. When not in use, the openings are typically covered with hatches, doorways, or other similar covers. Access to the openings is typically obtained by pivoting a lid about a hinge element or sliding the lid parallel to the surface defining the opening (if space permits). When uncovered, the openings can pose a fall hazard to personnel inside or on the wind turbine.

[0004] Due to space constraints, it is often not possible to lift cargo over a railing or the swing arc of a hinged lid. Therefore, the lid must be opened before suspending the cargo, or the cargo must be removed before closing the lid. In either case, when personnel approach the cargo, they must open the swing arm door and expose the opening. This in turn exposes the personnel to the fall hazard of the uncovered opening.

[0005] Accordingly, there is a continuing search in the art for new and improved systems and methods for solving the above problems. Accordingly, the present disclosure relates to an improved hatch assembly for a wind turbine and a method for operating the same. Summary of the Invention

[0006] Aspects and advantages of the invention will be set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.

[0007] In one aspect, the present disclosure relates to a wind turbine. The wind turbine may include a tower, a nacelle mounted on top of the tower, and a rotor mounted to the nacelle. The rotor may include a rotatable hub having one or more rotor blades fixed thereto. The wind turbine may further include an opening defined by a surface of the wind turbine. Additionally, the wind turbine may include a hatch assembly disposed adjacent to the opening. The hatch assembly may include a frame structure and a support surface. The frame structure may include a plurality of frame members arranged together to at least partially surround the opening. The plurality of frame members may further define a passage for receiving the support surface. The support surface may be capable of sliding between a first position and a second position. When the support surface is in the first position, the support surface may seal the opening defined by the surface of the wind turbine. When in the second position, the support surface may seal the passage defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the surface of the wind turbine.

[0008] In one embodiment, the frame structure may define at least one guide rail. The guide rail may define a guiding path for an end of the support surface.

[0009] In one embodiment, the guide rail may further include a first guiding path portion oriented parallel to the surface of the wind turbine. The guide rail may include a second guiding path portion oriented perpendicular to the surface of the wind turbine. The second guiding path portion may be located near the passage defined by the frame structure. Additionally, the guide rail may include a transition guiding path portion that operably couples the first guiding path portion to the second guiding path portion.

[0010] In one embodiment, the support surface may extend between a first end and a second end disposed opposite the first end. The support surface may have at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end. The (plural) sliding pins may be configured to be retained by at least one guide rail defined by the frame structure. The (plural) locking pins may be positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position.

[0011] In an additional embodiment, the (plural) pin receivers may be positioned on the plurality of frame members to prevent the first end of the support surface from entering the passage defined by the plurality of frame members of the frame structure.

[0012] In one embodiment, the first end of the support surface has a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

[0013] In one embodiment, the frame structure may further include at least one fixing element configured to receive the (plural) locking pins of the support surface and fix the support surface in the first position. Fixing of the support surface may prevent horizontal movement of the support surface.

[0014] In one embodiment, the opening can be a cargo passage opening. The wind turbine can further include a lifting device disposed above and in line with the cargo passage opening.

[0015] In one embodiment, the lifting device supports a load suspended above a support surface. The vertical gap between the support surface and the suspended load is greater than one (1) centimeter and less than 35 centimeters.

[0016] In another aspect, the present disclosure relates to a method for operating a hatch assembly to seal an opening of a wind turbine. The hatch assembly can have a frame structure and a support structure. The method can include arranging a plurality of frame members of the frame structure adjacent to the opening so as to at least partially surround the opening. The plurality of frame members can define a passage for receiving a support surface. The method can include securing the support surface to the frame structure. The method can further include transitioning the support surface between a first position and a second position by sliding at least along a guide rail of the frame structure. The first position can seal an opening defined by a surface of the wind turbine. The second position can seal the passage defined by the plurality of frame members to prevent personnel from being exposed to the opening.

[0017] In one embodiment, the support surface can extend between a first end and a second end disposed opposite the first end. The support surface can have at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end. The (plural) sliding pins can be configured to be held by at least one guide rail defined by the frame structure. Transitioning the support surface can further include raising or lowering the first end of the support surface so that the second end of the support surface rotates and slides along a guide rail portion of the frame structure.

[0018] In one embodiment, transitioning the support surface to the second position can further include transitioning the support structure to a vertical orientation by raising the first end of the support surface above at least one pin receiver coupled to the plurality of frame members. The method can further include moving the second end of the support surface toward the surface defining the opening so as to secure the (plural) locking pins in the (plural) pin receivers, thereby sealing the passage defined by the plurality of frame members of the frame structure and securing the support surface in the second position.

[0019] In one embodiment, the method can include moving the support surface perpendicular to the surface so as to disengage the (plural) locking pins from at least one pin receiver of the frame structure. The method can further include rotating and sliding the second end of the support surface between the opening and the suspended load so as to transition the support surface from the second position to the first position. The gap between the support surface and the suspended load can be greater than 2.5 centimeters and less than 30 centimeters.

[0020] In one embodiment, the method may further include lowering the load onto a support surface in a first position and separating the load from the lifting device.

[0021] In an additional embodiment, transitioning the support surface between the first position and the second position may occur in a space - restricted environment, where an obstacle may limit a first end of the support surface to a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

[0022] In another aspect, the present disclosure relates to a hatch assembly disposed near an opening defined by a surface. The hatch assembly may include a support surface extending between a first end and a second end disposed opposite the first end. The support surface may have at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end. The support surface may be at least capable of sliding between a first position and a second position. The hatch assembly may further include a frame structure. The frame structure may include a plurality of frame members arranged together to at least partially surround the opening. The plurality of frame members may further define a channel for receiving the support surface. The frame structure may define at least one guide rail that defines a guiding path for the sliding pin of the support surface to remain therein. The guide rail may include a first guiding path portion oriented parallel to the surface, a second guiding path portion oriented perpendicular to the surface, and a transition guiding path portion operably coupling the first guiding path portion to the second guiding path portion. The second guiding path portion may be positioned near the channel defined by the frame structure. When the support surface is in the first position, the support surface may include the opening defined by the surface. When in the second position, the support surface may block the channel defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the surface. The (one or more) locking pins may be positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position.

[0023] Technical solution 1. A wind turbine, comprising:

[0024] A tower;

[0025] A nacelle mounted on top of the tower;

[0026] A rotor mounted to the nacelle, the rotor including a rotatable hub having one or more rotor blades fixed thereto;

[0027] An opening defined by a surface of the wind turbine; and

[0028] A hatch assembly is disposed adjacent to the opening. The hatch assembly includes a frame structure and a support surface. The frame structure includes a plurality of frame members arranged together to at least partially surround the opening. The plurality of frame members further define a channel for receiving the support surface. The support surface is slidable between a first position and a second position.

[0029] Wherein, when the support surface is in the first position, the support surface seals the opening defined by the surface of the wind turbine. And wherein, when in the second position, the support surface seals the channel defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the surface of the wind turbine.

[0030] Technical solution 2. The wind turbine according to technical solution 1, wherein the frame structure defines at least one guide rail, and the guide rail defines a guiding path for an end portion of the support surface.

[0031] Technical solution 3. The wind turbine according to technical solution 2, wherein the guide rail further includes:

[0032] A first guiding path portion oriented parallel to the surface of the wind turbine;

[0033] A second guiding path portion oriented perpendicular to the surface of the wind turbine. The second guiding path portion is positioned near the channel defined by the frame structure; and

[0034] A transition guiding path portion that operably couples the first guiding path portion to the second guiding path portion.

[0035] Technical solution 4. The wind turbine according to technical solution 1, wherein the support surface extends between a first end and a second end opposite to the first end. The support surface has at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end. Wherein, the at least one sliding pin is configured to be held by at least one guide rail defined by the frame structure. And wherein, the at least one locking pin is positioned to be received by at least one pin receiver of the frame structure so as to fix the support surface in the second position.

[0036] Technical solution 5. The wind turbine according to technical solution 4, wherein the at least one pin receiver is positioned on the plurality of frame members to prevent the first end of the support surface from entering the channel defined by the plurality of frame members of the frame structure.

[0037] Aspect 6. The wind turbine according to Aspect 4, characterized in that the first end of the support surface has a maximum extension that exceeds the frame structure and is less than or equal to 30% of the length of the support surface.

[0038] Aspect 7. The wind turbine according to Aspect 4, characterized in that the frame structure further comprises at least one fixing element, the at least one fixing element being configured to receive at least one locking pin of the support surface and fix the support surface in the first position, wherein the fixing of the support surface prevents horizontal movement of the support surface.

[0039] Aspect 8. The wind turbine according to Aspect 1, characterized in that the opening is a cargo passage opening, and the wind turbine further comprises a lifting device arranged above the cargo passage opening and in a straight line with the cargo passage opening.

[0040] Aspect 9. The wind turbine according to Aspect 8, characterized in that the lifting device supports a load suspended above the support surface, wherein the vertical gap between the support surface and the load is greater than 2.5 cm and less than 30 cm.

[0041] Aspect 10. A method for operating a hatch assembly to seal an opening of a wind turbine, the hatch assembly having a frame structure and a support surface, the method comprising:

[0042] Arranging a plurality of frame members of the frame structure adjacent to the opening so as to at least partially surround the opening, the plurality of frame members defining a passage for receiving the support surface;

[0043] Fixing the support surface to the frame structure; and

[0044] Converting the support surface between a first position and a second position by sliding and rotating along a guide rail defined by the frame structure, the first position sealing the opening defined by the surface of the wind turbine, and the second position sealing the passage defined by the plurality of frame members to prevent personnel from being exposed to the opening.

[0045] Technical solution 11. The method according to technical solution 10, wherein the support surface extends between a first end and a second end disposed opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, wherein the at least one sliding pin is configured to be held by a guide rail defined by the frame structure, and wherein converting the support surface further includes raising or lowering the first end of the support surface relative to the surface of the wind turbine so that the second end of the support surface rotates and slides along the guide rail.

[0046] Technical solution 12. The method according to technical solution 11, wherein converting the support surface to the second position further includes:

[0047] Converting the support surface to a vertical orientation relative to the surface of the wind turbine by raising the first end of the support surface above at least one pin receiver coupled to the plurality of frame members; and

[0048] Moving the second end of the support surface toward the surface defining the opening so as to fix the at least one locking pin in the at least one pin receiver, thereby blocking the passage defined by the plurality of frame members of the frame structure and fixing the support surface in the second position.

[0049] Technical solution 13. The method according to technical solution 10, further comprising:

[0050] Actuating a lifting device disposed above and in line with the opening;

[0051] Lifting a load through the opening; and

[0052] Suspending the load above the opening.

[0053] Technical solution 14. The method according to technical solution 13, further comprising:

[0054] Moving the support surface perpendicular to the surface so as to disengage at least one locking pin from at least one pin receiver of the frame structure; and

[0055] Rotating and sliding the second end of the support surface between the opening and the suspended load so as to convert the support surface from the second position to the first position, wherein the gap between the support surface and the suspended load is greater than 2.5 cm and less than 30 cm.

[0056] Technical solution 15. The method according to technical solution 14, further comprising:

[0057] Lower the load onto the support surface in the first position; and

[0058] Separate the load from the lifting device.

[0059] Aspect 16. The method according to Aspect 10, wherein converting the support surface between the first position and the second position via the guide rail further comprises converting the support surface between the first position and the second position via a guiding path defined by the guide rail, the guiding path further comprising:

[0060] A first guiding path portion, which is oriented parallel to the surface;

[0061] A second guiding path portion, which is oriented perpendicular to the surface, the second guiding path portion being located near a passage defined by the frame structure; and

[0062] A transition guiding path portion, which operably couples the first guiding path portion to the second guiding path portion.

[0063] Aspect 17. The method according to Aspect 10, wherein converting the support surface between the first position and the second position occurs in a space - restricted environment, wherein an obstacle restricts a first end of the support surface to a maximum extension that exceeds the frame structure and is less than or equal to 30% of the length of the support surface.

[0064] Aspect 18. A hatch assembly disposed adjacent to an opening defined by a surface, the hatch assembly comprising:

[0065] A support surface, which extends between a first end and a second end disposed opposite to the first end, the support surface having at least one locking pin provided at the first end and at least one sliding pin provided at the second end, the support surface being capable of sliding at least between a first position and a second position; and

[0066] A frame structure includes a plurality of frame members arranged together to at least partially surround the opening. The plurality of frame members also define a channel for receiving the support surface. The frame structure defines at least one guide rail, and the at least one guide rail defines a guiding path for a slip pin of the support surface to be held therein. The at least one guide rail includes a first guiding path portion oriented parallel to the surface, a second guiding path portion oriented perpendicular to the surface, and a transition guiding path portion operatively coupling the first guiding path portion to the second guiding path portion. Wherein, the second guiding path portion is positioned near the channel defined by the frame structure.

[0067] Wherein, when the support surface is in the first position, the support surface seals the opening defined by the surface. Wherein, when in the second position, the support surface seals the channel defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the surface. And wherein, the at least one locking pin is positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position.

[0068] Technical solution 19. The hatch assembly according to technical solution 18, characterized in that the vertical gap between the support surface and the load suspended above the support surface is greater than 2.5 cm and less than 30 cm.

[0069] Technical solution 20. The hatch assembly according to technical solution 18, characterized in that the first end of the support surface has a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

[0070] With reference to the following description and the appended claims, these and other features, aspects, and advantages of the present invention will become better understood. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention. Description of the Drawings

[0071] A complete and enabling disclosure of the present invention for those of ordinary skill in the art, including its best mode, is set forth in the specification with reference to the accompanying drawings, in which:

[0072] Figure 1 A perspective view of an embodiment of a wind turbine according to the present disclosure is shown;

[0073] Figure 2 An internal perspective view of a nacelle of a wind turbine according to an embodiment of the present disclosure is shown;

[0074] Figure 3Shows an internal perspective view of a nacelle and a part of a tower of a wind turbine according to an embodiment of the present disclosure;

[0075] Figure 4 Shows a perspective view of a hatch assembly for a wind turbine according to an embodiment of the present disclosure, particularly showing the hatch assembly in a first position;

[0076] Figure 5 Shows the hatch assembly according to an embodiment of the present disclosure in a second position Figure 4 in perspective view;

[0077] Figure 6 Shows a perspective view of a part of a hatch assembly according to an embodiment of the present disclosure Figure 4 ;

[0078] Figures 7A to 7D Shows a perspective view of the hatch assembly according to an embodiment of the present disclosure transitioning from a second position to a first position Figure 4 ;

[0079] Figure 8 Shows a perspective view of a hatch assembly according to an embodiment of the present disclosure Figure 4 ; particularly shows a load supported by the hatch assembly in a first position; and

[0080] Figure 9 Shows a flowchart of an embodiment of a method for operating a hatch assembly to seal an opening of a wind turbine according to the present disclosure.

[0081] Reusing reference numerals in this specification and the drawings is intended to represent the same or similar features or elements of the present invention. Detailed Description

[0082] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided by way of explanation of the present invention and not limitation of the present invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the scope or spirit of the present invention. For example, features shown or described as part of one embodiment can be used with another embodiment to yield yet another embodiment. Accordingly, the present invention is intended to cover such modifications and variations as fall within the scope of the appended claims and their equivalents.

[0083] As used herein, the terms "first", "second", and "third" may be used interchangeably to distinguish one component from another and are not intended to denote the position or importance of the individual components.

[0084] The terms "coupled", "secured", "attached", etc. refer to both direct coupling, securing or attachment and indirect coupling, securing or attachment through one or more intermediate components or features, unless otherwise specified herein.

[0085] As used throughout the specification and claims, approximate language is used to modify any quantitative representation that admits of change without resulting in a change in the basic function associated therewith. Thus, values modified by one or more terms such as "about", "approximately", "substantially", and "essentially" are not limited to the precise values specified. In at least some instances, the approximate language may correspond to the precision of the instrument used to measure the value, or the precision of the method or machine used to construct or manufacture the component and / or system. For example, the approximate language may refer to within a margin of 10%.

[0086] Herein, as well as throughout the specification and claims, range limitations are combined and interchanged, such ranges are identified and include all subranges contained therein, unless the context or language indicates otherwise. For example, all ranges disclosed herein include the endpoints, and the endpoints can be combined independently of each other.

[0087] Generally, the present disclosure relates to assemblies and methods for preventing personnel from being exposed to an opening defined by the surface of a wind turbine. In particular, the present disclosure may include a hatch assembly. The hatch assembly may have a support surface, such as a grille, that is movable between two positions. In a first position, the support surface may seal, cover, or otherwise block the opening defined by the surface of the wind turbine. The hatch assembly may also have a frame structure that at least partially surrounds the opening. The frame structure may function both as a railing and as a guide for the support surface. For example, the frame structure may surround the opening on three sides, while the fourth side remains open, providing access to the area above the opening as long as the support surface is in the first position. When the support surface is in a second position, the support surface may block the fourth side of the opening. In other words, the support surface in the second position may function in the form of a door to prevent entry into the opening when the opening is not covered. The ability of the support surface to function as a door may eliminate the need for the frame structure to be equipped with a separate door structure, such as a swing arm door. Additionally, because the support surface blocks the opening, blocks the fourth side of the opening, or transitions between two positions, personnel can be prevented from being exposed to the fall hazard presented by the opening when the opening is not covered.

[0088] In addition to the benefits of preventing personnel from being exposed to the opening defined by the surface of the wind turbine, other benefits can be achieved based on the movement path of the support surface when the support surface is switched between the first and second positions. Specifically, the movement paths disclosed herein allow the support surface to be switched between the first and second positions in space-constrained applications. This can include situations where obstacles prevent the free movement of the support surface. For example, when the support surface is in the second position, a load can be lifted through the opening. Then, the support surface can be switched to the first position while the load remains suspended within one inch of the support surface. This type of switching would not be possible with a typical hinged hatch because the load would interfere with the swing arc of the hatch. Additionally, since the opening can be covered by the support surface when the load is suspended above the opening, the load can be lowered onto the support surface to facilitate separation of the load from the lifting mechanism. Similarly, due to the unique nature of the hatch assembly disclosed herein, this can be achieved without exposing personnel to the risk of falling into the opening.

[0089] Now referring to the drawings, Figure 1 a perspective view of one embodiment of a wind turbine 100 according to the present disclosure is shown. As shown, the wind turbine 100 generally includes a tower 102 extending from a foundation 104, a nacelle 106 mounted on the tower 102 and including a housing 160, and a rotor 108 coupled to the nacelle 106. The rotor 108 includes a rotatable hub 110 and at least one rotor blade 112, the rotor blade 112 being coupled to the hub 110 and extending outwardly from the hub 110. For example, in the illustrated embodiment, the rotor 108 includes three rotor blades 112. However, in alternative embodiments, the rotor 108 may include more or fewer than three rotor blades 112. Each rotor blade 112 may be spaced about the hub 110 to facilitate rotation of the rotor 108 such that kinetic energy can be converted from wind energy into useful mechanical energy and subsequently into electrical energy. For example, the hub 110 may be rotatably coupled to a generator 118 ( Figure 2 ) positioned within the nacelle 106 to permit the generation of electrical energy.

[0090] Now referring to Figure 2 , there is shown Figure 1Simplified internal view of an embodiment of the nacelle 106 of the wind turbine 100 shown. As shown, the generator 118 may be coupled to the rotor 108 for generating electrical power with the rotational energy generated by the rotor 108. For example, as shown in the illustrated embodiment, the rotor 108 may include a rotor shaft 122 that is coupled to the hub 110 for rotation therewith. The rotor shaft 122 may be rotatably supported by a main bearing 144. The rotor shaft 122 may in turn be rotatably coupled to the generator shaft 124 of the generator 118 via a gearbox 126, and the gearbox 202 is connected to the base support frame 136 by one or more torque arms 142. As is commonly understood, in response to the rotation of the rotor blades 112 and the hub 110, the rotor shaft 122 may provide a low-speed, high-torque input to the gearbox 126. The gearbox 126 may then be configured to convert the low-speed, high-torque input into a high-speed, low-torque output to drive the generator shaft 124 and thus drive the generator 118.

[0091] Each rotor blade 112 may also include a pitch control mechanism 120 that is configured to rotate each rotor blade 112 about its pitch axis 116. The pitch control mechanism 120 may include a pitch controller 150 that is configured to receive at least one pitch setpoint command from a controller. Additionally, each pitch control mechanism 120 may include a pitch drive motor 128 (e.g., any suitable electric, hydraulic, or pneumatic motor), a pitch drive gearbox 130, and a pitch drive pinion 132. In such an embodiment, the pitch drive motor 128 may be coupled to the pitch drive gearbox 130 such that the pitch drive motor 128 applies a mechanical force to the pitch drive gearbox 130. Similarly, the pitch drive gearbox 130 may be coupled to the pitch drive pinion 132 for rotation therewith. The pitch drive pinion 132 may in turn be in rotational engagement with a pitch bearing 134 coupled between the hub 110 and the corresponding rotor blade 112 such that rotation of the pitch drive pinion 132 causes rotation of the pitch bearing 134. Thus, in such an embodiment, rotation of the pitch drive motor 128 drives the pitch drive gearbox 130 and the pitch drive pinion 132, thereby rotating the pitch bearing 134 and the (one or more) rotor blades 112 about the pitch axis 116. Similarly, the wind turbine 100 may include one or more yaw drive mechanisms 138 communicatively coupled to the controller, each yaw drive mechanism 138 being configured to change the angle of the nacelle 106 relative to the wind (e.g., by engaging the yaw bearing 140 of the wind turbine 100).

[0092] Reference Figure 3, the wind turbine 100 may include at least one surface 152. In one embodiment, the surface(s) 152 may be a support surface and may have a generally horizontal orientation. In at least one embodiment, the surface(s) 152 may be in or a part of the nacelle 106. For example, the surface(s) 152 may be a part of the housing 160. In such an embodiment, the surface(s) 152 may have a non-horizontal orientation. In an additional embodiment, the surface(s) 152 may be located within the tower 102. For example, as Figure 3 specifically depicted in, the surface(s) 152 may be a platform located within the tower 102, such as a yaw platform, to support equipment or facilitate maintenance of the wind turbine 100.

[0093] In one embodiment, the surface(s) 152 may define at least one opening 154. The opening(s) 154 may be sized and positioned to allow access to various parts of the wind turbine 100. For example, in at least one embodiment, the opening(s) 154 may be cargo access openings positioned to facilitate lifting a load 156 to an upper part of the tower. In an alternative embodiment, the opening(s) 154 may be personnel access openings positioned to allow personnel access to various parts of the wind turbine 100. In at least one embodiment, the opening(s) 154 may be defined by the housing 160 and may facilitate access to the outer surface of the wind turbine 100. For example, the opening(s) 154 may be positioned to allow personnel to pass between the interior of the nacelle 106 and the top of the nacelle 106.

[0094] In at least one embodiment, the opening(s) 154 may be provided in a space-constrained location. In such an embodiment, the available clearance around the opening(s) 154 may be limited by at least one obstacle 164 ( Figure 4 ). The obstacle(s) 164 may be, for example, a structure of the wind turbine 100, such as a wall of the tower 102, additional passages of the wind turbine 100, and / or components of the wind turbine 100 such as described herein. It should be understood that the reduction of the available clearance by the obstacle(s) 164 may in turn limit the space into which a cover of the opening may swing, slide, or otherwise move to provide access to the opening(s) 154.

[0095] In one embodiment, as Figure 3As shown, the wind turbine 100 may be equipped with a lifting device 158. The lifting device 158 may be disposed above and in line with the opening(s) 154. The lifting device may be, for example, a winch, a crane, a lift, and / or a pulley arrangement. The lifting device 158 may be operatively coupled to the load 156 via a coupling element 162. The load 156 may include parts, components, tools, and / or supplies that may be directly coupled to the coupling element 162. In at least one embodiment, the load 156 may include a cargo bag or a cargo net, and the parts, components, tools, and / or supplies are placed in the cargo bag or the cargo net, and the cargo bag or the cargo net is coupled to the coupling element 162.

[0096] Now referring Figures 4 to 8 , a hatch assembly 200 for closing the opening(s) 154 is presented in accordance with the present disclosure. In one embodiment, the hatch assembly 200 may be disposed adjacent to the opening(s) 154. The hatch assembly may include a support surface 202 and a frame structure 204. The frame structure 204 may include a plurality of frame members 206, and the frame members 206 are arranged together to at least partially surround the opening(s) 154. The plurality of frame members 206 may define a channel 208 for receiving the support surface 202. The support surface 202 may be capable of sliding between a first position as depicted in Figure 4 and a second position as depicted in Figure 5 . When the support surface 202 is in the first position, the support surface 202 may close the opening(s) 154 defined by the surface(s) 152 of the wind turbine 100. When in the second position, the support surface 202 may close the channel 208 defined by the plurality of frame members of the frame structure. It should be understood that closing the opening(s) 154 and the channel 208 may prevent personnel from being exposed to the opening(s) 154.

[0097] In one embodiment, the support surface 202 may be a grille, a thick plate, a lid, a thin plate, a composite structure, or other support structures suitable for covering the opening(s) 154 and supporting the weight of personnel and / or a cargo load. In one embodiment, the support surface 202 may be perforated to allow air flow through the support surface 202. The support surface 202 may extend between a first end 210 and a second end 212 disposed opposite the first end 210. In at least one embodiment, the support surface 202 may be generally rectangular. However, in additional embodiments, the support surface 202 may be any other shape suitable for covering the opening(s) 154 to prevent personnel from being exposed to the opening(s) 154. It should be understood that although depicted as a planar structure in Figures 4 to 8 , the support surface 202 may be contoured to conform to the surface(s) 152.

[0098] In one embodiment, the support surface 202 may have at least one locking pin 214 disposed at the first end 210. In at least one embodiment, a single locking pin 214 may span the support surface 202, while in an alternative embodiment, a pair of locking pins 214 may be included at the first end 210. In one embodiment, as Figure 5 depicted, the (multiple) locking pins 214 may be positioned to be received by at least one pin receiver 216 coupled to the frame structure 204. The support surface 202 may also include at least one sliding pin 218 disposed at the second end 212. In at least one embodiment, a single sliding pin 218 may span the support surface 202, while in an alternative embodiment, a pair of sliding pins 218 may be included at the second end 212. The (multiple) sliding pins 218 may be configured to be retained by at least one guide rail 220 defined by the frame structure 204. The (multiple) locking pins 214 and the (multiple) sliding pins 218 may be bolts, rods, shafts, or other similar structures. The (multiple) locking pins 214 and the (multiple) sliding pins 218 may have a circular cross-section or a polygonal cross-section (e.g., square, hexagon, octagon, etc.). The (multiple) locking pins 214 and the (multiple) sliding pins 218 may include at least one washer and may also include at least one bushing. It should be understood that at least one bushing may roll along the (multiple) guide rails 220.

[0099] It should be understood that in an additional embodiment, the hatch assembly 200 may include more than one support surface 202. For example, in one embodiment, the size of the (multiple) openings 154 may be such that covering the opening with a single support surface 202 would require the single support surface 202 to have a large or otherwise undesirable size. In such an embodiment, a pair of support surfaces 202 may be arranged such that the respective second ends 212 are arranged to contact each other.

[0100] Still referring to Figures 4 to 8, the hatch assembly 200 may include a frame structure 204, and the frame structure 204 may include a plurality of frame members 206. In at least one embodiment, the frame structure 204 may at least partially surround the opening(s) 154 to form a barrier (e.g., railing). The plurality of frame members 206 may define a working volume 228 that extends at least between the opening(s) 154 and the frame members of the plurality of frame members 206 that are oriented substantially parallel to the surface(s) 152. Thus, in one embodiment, the plurality of frame members 206 may include at least one track member 222, at least one track support member 224, and / or at least one base member 226. In at least one embodiment, the track member 222 may be coupled to the track support member(s) 224. The track support member(s) 224 may in turn be coupled to the base member(s) 226, and the base member(s) 226 are coupled to the surface(s) 152. In at least one embodiment, access to the opening(s) 154 may be provided through a passage 208 defined by the track member(s) 222, the track support member(s) 224, and / or the base member(s) 226. It should be understood that the plurality of frame members 206 may include tubular components (e.g., pipes, square stock, etc.) and planar components (e.g., sheet materials).

[0101] Similarly as Figures 4 to 8 depicted, the frame structure 204 may define one or more guide rails 220. As Figure 6 specifically depicted therein, in one embodiment, the guide rail(s) 220 may define a guiding path 230 for the first end 210 or the second end 212 of the support surface 202. In at least one embodiment, the guide rail(s) 220 may be defined by the base member(s) 226 and may hold the slip pin(s) 218. In an additional embodiment, the hatch assembly 200 may include a pair of base members 226 disposed parallel to the opening(s) 154, and each of the base members 226 defines a guide rail 220. It should be understood that the guiding path 230 may define a movement path of the support surface 202. For example, in an embodiment where the slip pin(s) 218 are held in the guide rail(s) 220, the vertical movement of the slip pin(s) 218 in response to the geometry of the guiding path 230 may cause a corresponding vertical movement of the first end 210.

[0102] Still referring to Figures 4 to 8 , particularly Figure 6, in one embodiment, the (multiple) guide rails 220 and, derivatively, the guide path 230 may further include a first guide path portion 232. The first guide path portion 232 may be oriented generally parallel to the (multiple) surfaces 152 of the wind turbine 100. The (multiple) guide rails 220 and the guide path 230 may further include a second guide path portion 234, which is oriented generally perpendicular to the (multiple) surfaces 152 of the wind turbine 100. The second guide path portion 234 may be positioned near the channel 208 defined by the frame structure 204. In at least one embodiment, the (multiple) guide rails 220 and the guide path 230 may further include a transition guide path portion 236. The transition guide path portion 236 may operably couple the first guide path portion 232 to the second guide path portion 234. In at least one embodiment, the transition guide path portion 236 may include an arch that is at a greater distance (D1) from the (multiple) surfaces 152 than from the surface of the first guide path portion 232. Additionally, the second guide path portion 234 may have a terminal 238 that is at a distance (D3) from the (multiple) surfaces 152 that is less than the distance (D2) of the first guide path portion 232.

[0103] As Figure 4 , Figure 7D and Figure 8 depicted, in one embodiment, the support surface 202 has a first position that seals the (multiple) openings 154 and prevents personnel from being exposed to the (multiple) openings 154. When in the first position, the support surface 202 may be oriented generally parallel to the (multiple) surfaces 152. In at least one embodiment, when the support surface 202 is in the first position, the (multiple) slip pins 218 may be located in the first guide path portion 232. In an additional embodiment, the first position may include a first end 210 located near the channel 208 and a second end 212 positioned distally relative to the channel 208. In other words, in one embodiment, the (multiple) guide rails 220 may include a first guide rail end 240 near the channel 208 and a second guide rail end 242 disposed opposite thereto. In such an embodiment, the first position may include the first end 210 positioned near the first guide rail end 240 and the second end 212 positioned near the second guide rail end 242.

[0104] As Figure 5 and Figure 7ASpecifically depicted therein, the support surface 202 has a second position that seals the passageway 208 defined by the plurality of frame members 206 of the frame structure 204 and prevents personnel from being exposed to the (multiple) openings 154 in an uncovered condition. When in the second position, the support surface 202 can be oriented generally perpendicular to the (multiple) surfaces 152. In at least one embodiment, when the support surface 202 is in the second position, the (multiple) slip pins 218 can be located in the second slip path portion 234 adjacent the terminal 238. The second position can also include the (multiple) locking pins 214 positioned within the pin receivers 216. The pin receivers 216 can be configured to fix the support surface 202 in the second position. In at least one embodiment, the second position can include the first end 210 and the second end 212 being located near the passageway 208. It should be understood that in the second position, the support surface 202 can be used to complete the enclosure of the (multiple) openings 154 by the frame structure 204. Additionally, it should be understood that using the support surface 202 to seal both the (multiple) openings 154 and the passageway 208 can reduce the need to provide a separate door element to restrict personnel exposure to the (multiple) uncovered openings 154. This in turn can reduce the cost of the hatch assembly 200 or other fall protection systems of the wind turbine 100.

[0105] Now referring sequentially to Figures 7A to 7D, in one embodiment, the support surface 202 of the hatch assembly 200 may be capable of sliding at least between a first position and a second position. Transitioning from the second position to the first position may remove an obstruction from the passageway 208 and result in the occlusion of the opening(s) 154. In one embodiment, transitioning from the second position to the first position may involve moving the support surface 202 perpendicular to the surface(s) 152 in order to disengage the pin receiver 216. In other words, in one embodiment, transitioning from the second position to the first position may be initiated by lifting the support surface 202. This may cause the locking pin(s) 214 to exit the pin receiver 216 and the sliding pin(s) 218 to move along the second sliding path portion 234 to the apex 246 of the transition guide path portion 236. As the locking pin(s) 214 disengage from the pin receiver 216, the first end 210 of the support surface 202 may move (e.g., lower) toward the surface(s) 152. This movement may initiate the sliding of the sliding pin(s) 218 along the guide path 230 in the direction of the second guide rail end 242. As used herein, various forms of "sliding" refer to any movement of the sliding pin(s) 218 along the sliding path (e.g., sliding, skidding, and / or rolling). The movement (e.g., lowering) of the first end 210 may also cause the support surface 202 to rotate about the sliding pin(s) 218. In an additional embodiment, the movement of the first end 210 toward the surface(s) 152 may cause the second end 212 to move away from the passageway 208. It should be understood that since the movement of the first end 210 occurs simultaneously with the movement of the second end 212, the amount of clearance required to transition the support surface 202 between the second position and the first position is reduced. It should also be understood that in at least one embodiment, the support surface 202 may be transitioned between the first and second positions within the coverage area of the frame structure 204.

[0106] Now referring sequentially to Figures 7D to 7A , in one embodiment, transitioning from the first position to the second position may expose the opening(s) 154 and occlude the passageway 208. In one embodiment, transitioning from the first position to the second position may include moving (e.g., lifting) the first end 210 of the support surface 202 away from the surface(s) 152. This movement may cause the support surface 202 to rotate about the sliding pin(s) 218. This movement may also cause the sliding pin(s) 218 to slide along the first guide path portion 232 from the second guide rail end 242 toward the transition guide path portion 236. Accordingly, as the distance between the first end 210 and the surface(s) 152 increases, the distance between the second end 212 and the passageway 208 may decrease.

[0107] In one embodiment, as the (multiple) sliding pins 218 slide toward the first guide rail end 240 in response to the movement of the first end 210, the (multiple) sliding pins 218 encounter the apex 246 of the transition guide path portion 236. In at least one embodiment, the apex 246 can be the point on the guide path 230 that has the greatest distance from the (multiple) surfaces 152. In an additional embodiment, transitioning the (multiple) sliding pins 218 from the first guide path portion 232 to the apex 246 can cause the distance between the second end 212 and the (multiple) surfaces 152 to increase. By extension, this increase in distance can also cause the (multiple) locking pins 214 to move further away from the (multiple) surfaces 152. The movement of the (multiple) locking pins 214 away from the (multiple) surfaces 152 can position the (multiple) locking pins 214 to be received by the pin receiver 216. For example, in an embodiment where the (multiple) surfaces 152 are generally horizontal, sliding the (multiple) sliding pins 218 until the apex 246 can cause the (multiple) locking pins 214 to be positioned above the opening 248 of the pin receiver 216. As the (multiple) locking pins 214 are positioned to be received by the pin receiver 216, by moving the support surface 202 to an orientation perpendicular to the (multiple) surfaces 152, the support surface 202 can be further transitioned to the second position. In one embodiment, the support surface 202 can be fixed in the second position by moving the support surface 202 toward the (multiple) surfaces 152. Thus, fixing the support surface 202 in the second position can include moving the (multiple) sliding pins 218 along the sliding path 230 toward the terminal 238. In an additional embodiment, fixing the support surface 202 in the second position can also include moving the (multiple) locking pins 214 past the opening 248 of the pin receiver 216 and into the pin receiver 216. For example, in an embodiment where the (multiple) surfaces 152 are generally horizontal, the support surface 202 can be fixed in the second position by lowering the (multiple) locking pins 214 and the (multiple) sliding pins 218 into the pin receiver 216 and the second sliding path portion 234, respectively.

[0108] Referring again to Figures 4 to 8 , in one embodiment, the frame structure 204 can include a pin receiver 216 positioned to receive the (multiple) locking pins 214. In an additional embodiment, the pin receiver 216 can be positioned on the multiple frame members 206 to prevent the first end 210 of the support surface 202 from entering the passage 208 defined by the multiple frame members 206 of the frame structure 204. For example, in one embodiment, the pin receiver 216 can prevent the (multiple) openings 154 from being exposed via hinge movement, where the second end 212 of the support surface 202 remains in place during an opening operation. It should be understood that excluding the use of hinge movement can also prevent personnel from being exposed to both the open passage 208 and the (multiple) openings 154.

[0109] In one embodiment, the pin receiver 216 may be integrally constructed and may not have any movable elements. As such, in at least one embodiment, the pin receiver 216 may be formed from sheet material. The pin receiver 216 may be formed with a "J" shaped profile. In at least one embodiment, the pin receiver 216 may include a receiving arc 250 disposed between the opening 248 of the pin receiver 216 and the surface(s) 152. When the support surface 202 is fixed in the second position, the receiving arc 250 may be configured to support the locking pin(s) 214.

[0110] Still referring to Figures 4 to 8 , in one embodiment, the frame structure 204 may further include at least one fixing element 244. When the support surface 202 is in the first position, the fixing element(s) 244 may hold the locking pin(s) 214, such as Figure 7D specifically depicted in. As such, the fixing element(s) 244 may be configured to fix the support surface 202 in the first position. It should be understood that fixing the support surface 202 in the first position may prevent the support surface 202 from moving parallel to the surface(s) 152. In at least one embodiment, such movement may be a horizontal movement of the support surface 202.

[0111] As Figure 4 depicted, the hatch assembly 200 may be employed in a space-constrained environment. In such an embodiment, when the support surface 202 is switched between the first and second positions, the obstacle(s) 164 may prevent the full extension and further swinging of the support surface 202. For example, in at least one embodiment, the first end 210 of the support surface 202 may have a maximum extension (E M ) that exceeds the frame structure 204 and is less than or equal to 30% of the length (L) of the support surface 202. For example, in at least one embodiment, the obstacle(s) 164 may be positioned no less than 30% of the length (L) of the support surface 202 away from the coverage area of the frame structure 204. In such a position, the presence of the obstacle(s) 164 may not interfere with the switching of the support surface 202 between the first and second positions. It should be understood that the limitation on the position of the obstacle(s) 164 may only apply when the obstacle is positioned near the passage 208 and the first end 210. It should also be understood that when located away from the passage 208, the obstacle(s) 164 may be positioned in contact with the frame structure 204.

[0112] Again referring to Figures 7A to 7D, in at least one embodiment, the working volume 228 defined by the frame structure 204 may be occupied by the load 156. However, as described herein, the conversion of the support surface 202 between the first position and the second position may be achieved by suspending the load 156 above the support surface 202. In one embodiment, the minimum clearance (C M ) between the suspended load 156 and the support surface 202 may be one inch. For example, in at least one embodiment, the load 156 may be suspended above the support surface 202, and the clearance (C M ) between the support surface 202 and the load 156 is greater than one (1) centimeter and less than 35 centimeters. For example, in one embodiment, the clearance (C M ) may be greater than 2.5 centimeters and less than 30 centimeters. It should be understood that when the load 156 occupies the working volume 228, the ability to convert the support surface 202 between the first position and the second position may facilitate the hatch assembly 200 to prevent personnel from being exposed to the uncovered opening(s) 154.

[0113] It should also be understood that when the load 156 is suspended above the opening(s) 154, the ability to convert the support surface 202 from the second position to the first position may allow the opening(s) 154 to be covered after the load 156 is lifted, and then the load 156 is separated from the lifting device 158. In at least one embodiment, the support surface 202 may be converted to the first position by sliding the second end 212 under the suspended load 156. In the case where the opening(s) 154 are blocked by the support surface 202 in the first position, the load 156 may be lowered onto the support surface 202. As Figure 8 depicted, in the case where the load 156 is supported by the support surface 202, the load may be separated from the lifting device 158. In an additional embodiment, the load 156 may be placed on the support surface 202 before connecting the load 156 to the lifting device 158. It should be understood that the ability to manipulate the load 156 when the opening(s) 154 are blocked may be used to prevent personnel from being exposed to the opening(s) 154.

[0114] Now referring to Figure 9 , a flowchart of an embodiment of a method 300 for operating a hatch assembly to block an opening of a wind turbine is shown. The method 300 may be implemented using, for example, the hatch assembly 200 discussed above with reference to Figures 4 to 8 . For purposes of illustration and discussion, Figure 9 the steps are depicted in a specific order. Using the disclosure provided herein, those of ordinary skill in the art will understand that the various steps of the method 300 or any method disclosed herein may be adjusted, modified, rearranged, executed simultaneously, or otherwise modified without departing from the scope of the present disclosure.

[0115] As shown at (302), method 300 may include arranging a plurality of frame members of a frame structure adjacent to an opening so as to at least partially surround the opening. The plurality of frame members may define a passage for receiving a support surface. As shown at (304), method 300 may include fixing the support surface to the frame structure. As shown at (306), method 300 may include transitioning the support surface between a first position and a second position by sliding along a guide rail of the frame structure at least. The first position may block an opening defined by a surface of a wind turbine. The second position may block the passage defined by the plurality of frame members to prevent a person from being exposed to the opening.

[0116] In one embodiment, the method may further include actuating a lifting device disposed above and in line with the opening. The method may further include lifting a load through the opening and suspending the load above the opening.

[0117] In an additional embodiment, the method may include moving the support surface perpendicular to the surface so as to disengage at least one locking pin from at least one pin receiver of the frame structure. The method may further include rotating and sliding a second end of the support surface between the opening and the suspended load so as to transition the support surface from the second position to the first position. The clearance between the support surface and the suspended load may be greater than 2.5 centimeters to less than 30 centimeters.

[0118] In yet another embodiment, the method may include lowering a load onto the support surface in the first position and detaching the load from the lifting device.

[0119] This written description uses examples to disclose the invention, including the best mode, and also enables any person skilled in the art to practice the invention, including making and using any device or system and performing any incorporated method. The patentable scope of the invention is defined by the claims and may include other examples that occur to those skilled in the art. If these other examples include structural elements that are not different from the literal language of the claims, or if they include equivalent structural elements that have insubstantial differences from the literal language of the claims, then these other examples are intended to be within the scope of the claims.

[0120] Additional aspects of the invention are provided by the subject matter of the following clauses:

[0121] Clause 1. A wind turbine, comprising: a tower; a nacelle mounted on top of the tower; a rotor mounted to the nacelle, the rotor including a rotatable hub having one or more rotor blades fixed thereto; an opening defined by a surface of the wind turbine; and a hatch assembly disposed adjacent to the opening, the hatch assembly including a frame structure and a support surface, the frame structure including a plurality of frame members arranged together to at least partially surround the opening, the plurality of frame members further defining a passage for receiving the support surface, the support surface being slidable between a first position and a second position, wherein when the support surface is in the first position, the support surface closes the opening defined by the surface of the wind turbine, and wherein when in the second position, the support surface closes the passage defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the surface of the wind turbine.

[0122] Clause 2. The wind turbine according to any one of the preceding clauses, wherein the frame structure defines at least one guide rail, the guide rail defining a guiding path for an end of the support surface.

[0123] Clause 3. The wind turbine according to any one of the preceding clauses, wherein the guide rail further includes: a first guiding path portion oriented parallel to the surface of the wind turbine; a second guiding path portion oriented perpendicular to the surface of the wind turbine, the second guiding path portion being located near the passage defined by the frame structure; and a transition guiding path portion operatively connecting the first guiding path portion to the second guiding path portion.

[0124] Clause 4. The wind turbine according to any one of the preceding clauses, wherein the support surface extends between a first end and a second end disposed opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, wherein the at least one sliding pin is configured to be held by at least one guide rail defined by the frame structure, and wherein the at least one locking pin is positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position.

[0125] Clause 5. The wind turbine according to any one of the preceding clauses, wherein the at least one pin receiver is positioned on the plurality of frame members to prevent the first end of the support surface from entering the passage defined by the plurality of frame members of the frame structure.

[0126] Clause 6. The wind turbine according to any one of the preceding clauses, wherein the first end of the support surface has a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

[0127] Clause 7. A wind turbine according to any of the preceding clauses, wherein the frame structure further comprises at least one fixing element configured to receive at least one locking pin of a support surface and fix the support surface in a first position, wherein fixing of the support surface prevents horizontal movement of the support surface.

[0128] Clause 8. A wind turbine according to any of the preceding clauses, wherein the opening is a cargo passage opening, and the wind turbine further comprises a lifting device disposed above and in line with the cargo passage opening.

[0129] Clause 9. A wind turbine according to any of the preceding clauses, wherein the lifting device supports a load suspended above the support surface, and the vertical gap between the support surface and the load is greater than 2.5 cm and less than 30 cm.

[0130] Clause 10. A method for operating a hatch assembly to seal an opening of a wind turbine, the hatch assembly having a frame structure and a support surface, the method comprising: arranging a plurality of frame members of the frame structure adjacent to the opening so as to at least partially surround the opening, the plurality of frame members defining a passage for receiving the support surface; fixing the support surface to the frame structure; and converting the support surface between a first position and a second position by sliding and rotating along a guide rail of the frame structure, the first position sealing the opening defined by the surface of the wind turbine, and the second position sealing the passage defined by the plurality of frame members to prevent personnel from being exposed to the opening.

[0131] Clause 11. A method according to any of the preceding clauses, wherein the support surface extends between a first end and a second end disposed opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, wherein the at least one sliding pin is configured to be held by at least one guide rail defined by the frame structure, and wherein converting the support surface further comprises raising or lowering the first end of the support surface relative to the surface of the wind turbine to cause the second end of the support surface to rotate and slide along the guide rail portion of the frame structure.

[0132] Clause 12. A method according to any of the preceding clauses, wherein converting the support surface to the second position further comprises converting the support structure to a vertical orientation relative to the surface of the wind turbine by raising the first end of the support surface above at least one pin receiver coupled to the plurality of frame members; and moving the second end of the support surface towards the surface defining the opening to fix at least one locking pin in at least one pin receiver, thereby sealing the passage defined by the plurality of frame members of the frame structure and fixing the support surface in the second position.

[0133] Clause 13. The method according to any one of the preceding clauses further comprises: actuating a lifting device disposed above and in line with the opening; lifting the load through the opening; and suspending the load above the opening.

[0134] Clause 14. The method according to Clause 13 further comprises: moving a support surface perpendicular to the surface so as to disengage at least one locking pin from at least one pin receiver of a frame structure; and rotating and sliding a second end portion of the support surface between the opening and the suspended load so as to transition the support surface from a second position to a first position, wherein a clearance between the support surface and the suspended load is greater than 2.5 cm and less than 30 cm.

[0135] Clause 15. The method according to any one of the preceding clauses further comprises: lowering the load onto the support surface in the first position; and detaching the load from the lifting device.

[0136] Clause 16. The method according to any one of the preceding clauses, wherein transitioning the support surface between the first position and the second position via a guide rail further comprises transitioning the support surface between the first position and the second position via a guiding path defined by the guide rail, the guiding path further comprising: a first guiding path portion oriented parallel to the surface; a second guiding path portion oriented perpendicular to the surface, the second guiding path portion being positioned near a channel defined by the frame structure; and a transition guiding path portion operably coupling the first guiding path portion to the second guiding path portion.

[0137] Clause 17. The method according to any one of the preceding clauses, wherein transitioning the support surface between the first position and the second position occurs in a space-constrained environment, wherein an obstacle restricts a first end portion of the support surface to a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

[0138] Clause 18. A hatch assembly disposed adjacent to an opening defined by a surface, the hatch assembly comprising: a support surface extending between a first end and a second end disposed opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, the support surface being capable of sliding at least between a first position and a second position; and a frame structure including a plurality of frame members arranged together to at least partially surround the opening, the plurality of frame members further defining a channel for receiving the support surface, the frame structure defining at least one guide rail, the at least one guide rail defining a guiding path for the sliding pin of the support surface to be held therein, the guide rail including a first guiding path portion oriented parallel to the surface, a second guiding path portion oriented perpendicular to the surface, and a transition guiding path portion operatively connecting the first guiding path portion to the second guiding path portion, wherein the second guiding path portion is positioned near the channel defined by the frame structure, wherein when the support surface is in the first position, the support surface closes the opening defined by the surface, wherein when in the second position, the support surface closes the channel defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the surface, and wherein at least one locking pin is positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position.

[0139] Clause 19. The hatch assembly according to any one of the preceding clauses, wherein the vertical gap between the support surface and a load suspended above the support surface is greater than 2.5 cm and less than 30 cm.

[0140] Clause 20. The hatch assembly according to any one of the preceding clauses, wherein the first end of the support surface has a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

Claims

1. A wind turbine, comprising: a tower; a nacelle mounted on top of the tower; a rotor mounted to the nacelle, the rotor including a rotatable hub having one or more rotor blades fixed thereto; an opening defined by a first surface of the wind turbine; and a hatch assembly disposed adjacent to the opening, the hatch assembly including a frame structure and a support surface, the frame structure including a plurality of frame members arranged together to at least partially surround the opening, the plurality of frame members further defining a passage for receiving the support surface, the support surface being slidable between a first position in which the support surface is oriented generally parallel to the first surface and a second position in which the support surface is oriented generally perpendicular to the first surface; wherein, when the support surface is in the first position, the support surface closes the opening defined by the first surface of the wind turbine, and wherein, when in the second position, the support surface closes the passage defined by the plurality of frame members of the frame structure to prevent personnel from being exposed to the opening defined by the first surface of the wind turbine; and wherein when the support surface slides between the first position and the second position, the plurality of frame members of the frame structure are fixed relative to the support surface, and wherein, when the support surface is in the first position and when the support surface is in the second position, the plurality of frame members define the passage.

2. The wind turbine according to claim 1, characterized in that The frame structure defines at least one guide rail that defines a guiding path for an end of the support surface.

3. The wind turbine according to claim 2, characterized in that, The guide rail further includes: a first guiding path portion oriented parallel to the first surface of the wind turbine; a second guiding path portion oriented perpendicular to the first surface of the wind turbine, the second guiding path portion being located near the passage defined by the frame structure; and a transition guiding path portion operatively coupling the first guiding path portion to the second guiding path portion.

4. The wind turbine according to claim 1, characterized in that, The support surface extends between a first end and a second end disposed opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, wherein the at least one sliding pin is configured to be retained by at least one guide rail defined by the frame structure, and wherein the at least one locking pin is positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position.

5. The wind turbine according to claim 4, characterized in that, The at least one pin receiver is positioned on the plurality of frame members to prevent the first end of the support surface from entering the passage defined by the plurality of frame members of the frame structure.

6. The wind turbine according to claim 4, characterized in that, The first end of the support surface has a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

7. The wind turbine according to claim 4, characterized in that, The frame structure further includes at least one fixing element configured to receive at least one locking pin of the support surface and fix the support surface in the first position, wherein fixing of the support surface prevents horizontal movement of the support surface.

8. The wind turbine according to claim 1, characterized in that, The opening is a cargo passage opening, and the wind turbine further includes a lifting device disposed above and in line with the cargo passage opening.

9. The wind turbine according to claim 8, characterized in that, The lifting device supports a load suspended above the support surface, wherein a vertical gap between the support surface and the load is greater than 2.5 cm and less than 30 cm.

10. A method for operating a hatch assembly to seal an opening of a wind turbine, the hatch assembly having a frame structure and a support surface, the opening being defined by a first surface of the wind turbine, the method comprising: Arranging a plurality of frame members of the frame structure adjacent to the opening so as to at least partially surround the opening, the plurality of frame members defining a passage for receiving the support surface; Fixing the support surface to the frame structure; and Converting the support surface between a first position in which the support surface is oriented generally parallel to the first surface and a second position in which the support surface is oriented generally perpendicular to the first surface by sliding and rotating along a guide rail defined by the frame structure, the first position sealing the opening defined by the first surface of the wind turbine and the second position sealing the passage defined by the plurality of frame members to prevent personnel from being exposed to the opening; wherein the plurality of frame members of the frame structure are fixed relative to the support surface when the support surface slides between the first position and the second position, and wherein the plurality of frame members define the passage when the support surface is in the first position and when the support surface is in the second position.

11. The method according to claim 10, wherein, The support surface extends between a first end and a second end disposed opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, wherein the at least one sliding pin is configured to be held by a guide rail defined by the frame structure, and wherein converting the support surface further includes raising or lowering the first end of the support surface relative to the first surface of the wind turbine to cause the second end of the support surface to rotate and slide along the guide rail.

12. The method according to claim 11, wherein Converting the support surface to the second position further includes: Converting the support surface to a vertical orientation relative to the first surface of the wind turbine by raising the first end of the support surface above at least one pin receiver coupled to the plurality of frame members; and Moving the second end of the support surface toward the first surface defining the opening so as to fix the at least one locking pin in the at least one pin receiver, thereby sealing the passage defined by the plurality of frame members of the frame structure and fixing the support surface in the second position.

13. The method according to claim 10, characterized in that, Further comprising: Actuate a lifting device disposed above and in line with the opening; Lift the load through the opening; and Suspend the load above the opening.

14. The method according to claim 13, wherein Further comprising: Move the support surface perpendicular to the first surface to disengage at least one locking pin from at least one pin receiver of the frame structure; and Rotate and slide a second end of the support surface between the opening and the suspended load to transition the support surface from the second position to the first position, wherein a gap between the support surface and the suspended load is greater than 2.5 cm and less than 30 cm.

15. The method according to claim 14, wherein Further comprising: Lower the load onto the support surface in the first position; and Separate the load from the lifting device.

16. The method according to claim 10, characterized in that, Transitioning the support surface between the first position and the second position via the guide rail further comprises transitioning the support surface between the first position and the second position via a guiding path defined by the guide rail, the guiding path further comprising: A first guiding path portion oriented parallel to the first surface; A second guiding path portion oriented perpendicular to the first surface, the second guiding path portion positioned near a channel defined by the frame structure; and A transition guiding path portion operably coupling the first guiding path portion to the second guiding path portion.

17. The method according to claim 10, wherein Transitioning the support surface between the first position and the second position occurs in a space-constrained environment where an obstacle limits a first end of the support surface to a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

18. A hatch assembly disposed adjacent to an opening defined by a first surface, the hatch assembly comprising: A support surface extending between a first end and a second end opposite the first end, the support surface having at least one locking pin disposed at the first end and at least one sliding pin disposed at the second end, the support surface being capable of sliding at least between a first position in which the support surface is generally oriented parallel to the first surface and a second position in which the support surface is generally oriented perpendicular to the first surface; and A frame structure including a plurality of frame members arranged together to at least partially surround the opening, the plurality of frame members further defining a channel for receiving the support surface, the frame structure defining at least one guide rail, the at least one guide rail defining a guiding path for the sliding pin of the support surface to remain therein, the at least one guide rail including a first guiding path portion oriented parallel to the first surface, a second guiding path portion oriented perpendicular to the first surface, and a transition guiding path portion operably coupling the first guiding path portion to the second guiding path portion, wherein the second guiding path portion is positioned near a channel defined by the frame structure, Wherein, when the support surface is in the first position, the support surface seals an opening defined by the first surface, and wherein, when in the second position, the support surface seals a passage defined by a plurality of frame members of the frame structure to prevent a person from being exposed to the opening defined by the first surface, and wherein the at least one locking pin is positioned to be received by at least one pin receiver of the frame structure to fix the support surface in the second position; and Wherein when the support surface slides between the first position and the second position, the plurality of frame members of the frame structure are fixed relative to the support surface, and wherein the plurality of frame members define the passage when the support surface is in the first position and when the support surface is in the second position.

19. The hatch assembly according to claim 18, wherein, The vertical gap between the support surface and a load suspended above the support surface is greater than 2.5 cm and less than 30 cm.

20. The hatch assembly according to claim 18, characterized in that, A first end of the support surface has a maximum extension beyond the frame structure that is less than or equal to 30% of the length of the support surface.

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