Patent Publication Number: US-11661715-B2

Title: Manhole guard and attachable winch mount

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to U.S. Provisional Application No. 62/880,802 filed under 35 U.S.C. § 111(b) on Jul. 31, 2019, the entire disclosure of which is incorporated herein by reference for all purposes. 
    
    
     BACKGROUND 
     Manholes form an interface between the surface and subsurface. Manholes provide access to underground networks that contain vital infrastructure such as utility and sewage systems. To service this underground infrastructure, manholes must be temporarily uncovered to permit the transport of materials and personnel between the surface and subsurface. 
     Servicing this underground infrastructure poses a variety of safety concerns for workers and members of the general public. Materials need to be safely transported between the surface and subsurface without damage to supplies or injury to unsuspecting workers below. Workers need to be transported between the surface and subsurface without injury to the worker or, in the case of a worker injured below, to assist the injured worker. In addition, both workers and members of the general public run the risk of injury from falling into, or tripping over, uncovered manholes. 
     To address these and other safety concerns, portable manhole guards were created to safely identify and limit access to manholes that are temporarily uncovered. In addition, hoist devices were developed to be attached to manhole guards to safely transport materials and personnel between the surface and underground. However, conventional manhole guards and hoist devices suffer durability, accessibility, assembly, and portability problems. Thus, there is a need in the art for new and improved manhole guards. 
     SUMMARY 
     Provided herein is a manhole guard comprising a plurality of sections connected for movement, the sections comprising a center section, a first wing, and a second wing, wherein the center section comprises a first post and a second post connected by at least one center section rail, the first wing comprises a first wing post connected to the first post by at least one of an upper first wing rail and a lower first wing rail, and the second wing comprises a second wing post connected to the second post by at least one of an upper second wing rail and a lower second wing rail; a first mounting bracket connected to the first wing, and a second mounting bracket connected to the second wing; and a primary mounting member connected to the first wing and to the first mounting bracket, and a secondary mounting member connected to the second wing and to the second mounting bracket. 
     In certain embodiments, the primary mounting member comprises a primary body, a first primary arm connected to the primary body, and a second primary arm connected to the primary body; and wherein the secondary mounting member comprises a secondary body, a first secondary arm connected to the secondary body, and a second secondary arm connected to the secondary body. 
     In particular embodiments, the primary body further includes a primary body lower recess and a primary body upper recess; and wherein the secondary body includes a secondary body lower recess and a secondary body upper recess. 
     In particular embodiments, the primary body lower recess is configured to accept the upper first wing rail in an interference fit and the secondary body lower recess is configured to accept the upper second wing rail in an interference fit 
     In particular embodiments, the first primary arm includes a first primary arm body and a first primary arm extension extending from the first primary arm body; and wherein the second primary arm includes a second primary arm body and a second primary arm extension extending from the second primary arm body. 
     In particular embodiments, the first primary arm extension includes a first primary arm extension opening; and wherein the second primary arm extension includes a second primary arm extension opening. 
     In particular embodiments, the primary mounting member further includes a primary bridging member extending between the first primary arm and the second primary arm and connected to the first primary arm and the second primary arm; and wherein the secondary mounting member further includes a secondary bridging member extending between the first secondary arm and the second secondary arm and connected to the first secondary arm and the second secondary arm. 
     In particular embodiments, the primary mounting member further includes a winch platform. 
     In particular embodiments, the winch platform is attached to the primary body, to the first primary arm, or to both the primary body and the first primary arm. 
     In particular embodiments, the first primary arm includes at least one first primary arm body opening. 
     In particular embodiments, a winch is attached to the winch platform. 
     In particular embodiments, one or more fasteners extend through the at least one first primary arm body opening to secure the winch to the winch platform. 
     In particular embodiments, the first primary arm includes a first primary arm recess. 
     In particular embodiments, the manhole guard further includes a first arm connected to the center section and capable of locking the first wing into a fixed position relative to the center section. 
     In particular embodiments, the manhole guard further includes a second arm connected to the center section and capable of locking the second wing into a fixed position relative to the center section. 
     In particular embodiments, the first arm and the second arm operate independently of each other. 
     In particular embodiments, at least one of the first arm or the second arm comprises a spring-loaded latch mechanism configured to accept either the first wing or the second wing. 
     In particular embodiments, the first mounting bracket has a first top recess, a first middle recess, and a first lower recess. 
     In particular embodiments, the first lower recess is configured to accept the first lower wing rail in an interference fit, and the first middle recess is configured to accept the first upper wing rail in an interference fit. 
     In particular embodiments, the second mounting bracket has a second top recess, a second middle recess, and a second lower recess. 
     In particular embodiments, the second lower recess is configured to accept the second lower wing rail in an interference fit, and the second middle recess is configured to accept the second upper wing rail in an interference fit. 
     In particular embodiments, the manhole guard further comprises a safety net attached to one or more of the first wing, the second wing, and the center section, the safety net being configured to block debris. In particular embodiments, the safety net includes a reflective material. In particular embodiments, the safety net includes a toe board. 
     In particular embodiments, the primary mounting member is fixed to the first mounting bracket by positioning the first mounting bracket between the first primary arm and the second primary arm, by positioning the first mounting bracket between the primary bridging member and the first primary arm extension opening and the second primary arm extension opening, and by inserting a primary fastener through the first primary arm extension opening and the second primary arm extension opening; and wherein the secondary mounting member is fixed to the second mounting bracket by positioning the second mounting bracket between the first secondary arm and the second secondary arm, by positioning the second mounting bracket between the secondary bridging member and the first secondary arm extension opening and the second secondary arm extension opening, and by inserting a secondary fastener through the first secondary arm extension opening and the second secondary arm extension opening. 
     Further provided is a manhole guard comprising a plurality of sections connected for movement, the sections including a center section, a first wing, and a second wing, wherein the center section comprises a first post and a second post connected by at least one center section rail, the first wing comprises a first wing post connected to the first post by at least one of an upper first wing rail and a lower first wing rail, and the second wing comprises a second wing post connected to the second post by at least one of an upper second wing rail and a lower second wing rail; a first hoist assembly comprising a first mounting bracket connected to the first wing, and a second mounting bracket connected to the second wing; and a second hoist assembly comprising a primary mounting member connected to the first wing and to the first mounting bracket, and a secondary mounting member connected to the second wing and to the second mounting bracket. 
     In certain embodiments, the manhole guard further comprises a safety net attached to one or more of the first wing, the second wing, and the center section. In particular embodiments, the safety net includes a reflective material. In particular embodiments, the safety net includes a toe board. In particular embodiments, the toe board is made from rubber. 
     Further provided is a manhole guard comprising a plurality of sections connected for movement, the sections including a center section, a first wing, and a second wing, wherein the center section comprises a first post and a second post connected by at least one center section rail, the first wing comprises a first wing post connected to the first post by at least one of an upper first wing rail and a lower first wing rail, and the second wing comprises a second wing post connected to the second post by at least one of an upper second wing rail and a lower second wing rail; and a safety net attached to one or more of the first wing, the second wing, and the center section. 
     In certain embodiments, the safety net includes one or more rail attachment features. In particular embodiments, the safety net includes one or more post attachment features. In particular embodiments, the safety net includes reflective tape. In particular embodiments, the safety net is made from a reflective material. In particular embodiments, the safety net includes a toe board. 
     Further provided is a hoist assembly for a manhole guard comprising a primary mounting member having a primary body, a first primary arm connected to the primary body, and a second primary arm connected to the primary body; a secondary mounting member having a secondary body, a first secondary arm connected to the secondary body, and a second secondary arm connected to the secondary body; a crossbar extending between the primary mounting member and the secondary mounting member and engaging the primary mounting member and the secondary mounting member; and a hoist device attached to the crossbar. 
     In certain embodiments, the primary body further includes a primary body lower recess and a primary body upper recess. In particular embodiments, the secondary body further includes a secondary body lower recess and a secondary body upper recess. In particular embodiments, the first primary arm includes a first primary arm body and a first primary arm extension extending from the first primary arm body. In particular embodiments, the second primary arm includes a second primary arm body and a second primary arm extension extending from the second primary arm body. In particular embodiments, the first primary arm extension includes a first primary arm extension opening, and wherein the second primary arm extension includes a second primary arm extension opening. In particular embodiments, the primary mounting member further includes a primary bridging member extending between the first primary arm and the second primary arm and connected to the first primary arm and the second primary arm; and the secondary mounting member further includes a secondary bridging member extending between the first secondary arm and the second secondary arm and connected to the first secondary arm and the second secondary arm. 
     In particular embodiments, the primary mounting member further includes a winch platform. 
     In particular embodiments, the winch platform is attached to the primary body or to the first primary arm or to both the primary body and the first primary arm. 
     In particular embodiments, a winch is attached to the winch platform. 
     In particular embodiments, the first primary arm includes at least one first primary arm body opening. 
     In particular embodiments, fasteners secure the winch to the winch platform using the at least one first primary arm body opening. 
     In particular embodiments, the first primary arm includes a first primary arm recess. 
     In particular embodiments, at least one of the primary arm extensions and secondary arm extensions is tapered. 
     Further provided is a primary mounting member for a manhole guard comprising a primary body having a primary body lower recess and a primary body upper recess, a first primary arm connected to the primary body, and a second primary arm connected to the primary body. In certain embodiments, the primary body lower recess is positioned on the primary body at an angle relative to the position of the primary body upper recess. In certain embodiments, the primary body upper recess is oriented in a direction that is transverse to the orientation of the primary body lower recess. In certain embodiments, the primary body is a hollow rectangular structure. In certain embodiments, the first primary arm includes a first primary arm body and a first primary arm extension extending from the first primary arm body. In particular embodiments, the second primary arm includes a second primary arm body and a second primary arm extension extending from the second primary arm body. In particular embodiments, the first primary arm body has at least one first primary arm body opening. In particular embodiments, the second primary arm body has at least one second primary arm body opening. In particular embodiments, at least one of the first primary arm extension and the second primary arm extension has a tapered end. In particular embodiments, the first primary arm extension includes a first primary arm extension opening. In particular embodiments, the second primary arm extension includes a second primary arm extension opening. In particular embodiments, the first primary arm extension and the second primary arm extension extend in the same direction such that the first primary arm extension opening and the second primary arm extension opening are aligned. 
     In certain embodiments, the first primary arm includes a first primary arm recess. In certain embodiments, a winch platform is attached to at least one of the primary body and the first primary arm. In particular embodiments, the winch platform is “L”-shaped. 
     Further provided is a safety barricade comprising a barricade structure; and a safety net attached to the barricade structure, wherein the safety net comprises one or more rail attachment features or post attachment features. In certain embodiments, the safety net includes reflective tape. In certain embodiments, the safety net is made from a reflective material. In certain embodiments, the safety net includes a toe board. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1   : Perspective view of the portable manhole guard with attachable mounting brackets for a hoist device and telescopically-fitted adjustable feet in accordance with the present disclosure. 
         FIG.  2   : View of a first arm in an unlocked position. When in use, the first arm may lock the first wing of the manhole guard into a fixed position. The second arm may lock the second wing of the manhole guard into a fixed position. 
         FIGS.  3 A- 3 B : Lateral views of a latch mechanism on the first arm ( FIG.  3 A ), which is used to secure the first wing into a fixed position, and a latch mechanism on the second arm ( FIG.  3 B ), which may be used to secure the second wing into a fixed position. 
         FIG.  4   : View of a telescopically-fitted adjustable foot. The telescopically-fitted adjustable feet may be used to balance the manhole guard on the ground and adjust the height or level of the manhole guard. 
         FIGS.  5 A- 5 C : Views of non-limiting example configurations of mounting brackets.  FIG.  5 A  shows an elevated angled view of the second mounting bracket with a winch platform and mounting plate attached.  FIG.  5 B  shows an exploded view of the second mounting bracket with a winch platform.  FIG.  5 C  shows a lateral view of the first top recess of the first mounting bracket. 
         FIG.  6   : Perspective view of a manhole guard with a hoist assembly and a winch attached to a winch platform in accordance with the present disclosure. 
         FIGS.  7 A- 7 B : Views of a manhole guard with mounting brackets and mounting members.  FIG.  7 A  is a perspective view of the manhole guard with mounting brackets and mounting members attached, and first and second arms securing the first and second wings into position.  FIG.  7 B  is a first wing side view of the manhole guard with mounting brackets and mounting members attached. 
         FIG.  8   : Photograph showing a view of a manhole guard with attached mounting brackets and mounting members and a first arm securing the first wing into a fixed position. 
         FIG.  9   : Photograph showing a side view of the manhole guard in a folded position with attached mounting brackets and mounting members. 
         FIGS.  10 A- 10 D : Views of the primary body of the primary mounting member.  FIG.  10 A  is a perspective view of the primary body.  FIG.  10 B  is a side view of the primary body showing the primary body upper recess.  FIG.  10 C  is a side view of the primary body showing the primary body lower recess.  FIG.  10 D  is top view of the primary body showing the primary body upper recess. 
         FIGS.  11 A- 11 D : Views of the primary mounting member.  FIG.  11 A  is a perspective view of the primary mounting member.  FIG.  11 B  is a side view of the primary mounting member showing the first primary arm recess, primary body upper recess, primary bridging member, and winch platform.  FIG.  11 C  is a top view of the primary mounting member.  FIG.  11 D  is a side view of the primary mounting member showing the primary body, first and second primary arms, winch platform, and primary body lower recess. 
         FIG.  12   : Photograph showing a side view of a primary mounting member that includes a first primary arm recess, a primary body upper recess, a primary bridging member, and a winch platform. 
         FIGS.  13 A- 13 D : Views of the secondary body of the secondary mounting member.  FIG.  13 A  is a perspective view of the secondary body.  FIG.  13 B  is a side view of the secondary body showing the secondary body upper recess.  FIG.  13 C  is a side view of the secondary body showing the secondary body lower recess.  FIG.  13 D  is top view of the secondary body showing the secondary body upper recess. 
         FIGS.  14 A- 14 D : Views of the secondary mounting member.  FIG.  14 A  is a perspective view of the secondary mounting member.  FIG.  14 B  is a side view of the secondary mounting member showing a second secondary arm, a secondary body upper recess, and a secondary bridging member.  FIG.  14 C  is a top view of the secondary mounting member.  FIG.  14 D  is a side view of the secondary mounting member showing a secondary body, first and second secondary arms, and a secondary body lower recess. 
         FIG.  15   : Photograph showing a side view of a secondary mounting member that includes a secondary body upper recess and a secondary bridging member. 
         FIG.  16   : Photograph of a manhole guard containing a fully assembled first hoist assembly and second hoist assembly. 
         FIG.  17   : Side view of the manhole guard from  FIG.  16    from the first wing where a second winch is attached to the primary mounting member. 
         FIGS.  18 A- 18 B : Views of a manhole guard containing a safety net.  FIG.  18 A  is a photograph of a manhole guard containing a safety net from the open front of the manhole guard. 
         FIG.  18 B  is a photograph of a manhole guard containing a safety net from the rear of the manhole guard. 
         FIG.  19   : Photograph showing a safety net attached to the center section by rail attachment features and post attachment features. 
         FIG.  20   : Side view of a manhole guard with attached mounting brackets, mounting members, and safety net. 
         FIG.  21   : View of a safety net with rail attachment features and post attachment features. 
     
    
    
     DETAILED DESCRIPTION 
     Various embodiments are described in the present disclosure in the context of a manhole guard. Those of ordinary skill in the art will realize that the following detailed description of the embodiments is illustrative only and not intended to be in any way limiting. Other embodiments will readily suggest themselves to such skilled persons having the benefit of the disclosure. References to an “embodiment,” “aspect,” or “example” in this disclosure indicate that the embodiments of the invention so described may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Further, repeated use of the phrase “in one embodiment” does not necessarily refer to the same embodiment, although it may. 
     Described herein is a manhole guard that addresses various problems in the art. The present disclosure provides a portable manhole guard that, in some embodiments, is easy to assemble, is durable, will not collapse while transporting weighted materials, is stable, is adjustable, is capable of folding flat on itself, and does not hinder access to a manhole during use. Furthermore, any suitable hoist device is capable of being easily attached to the manhole guard and supported by the frame and structure of the manhole guard. The manhole guard described herein thus has many advantages that provide improved durability, stability, and safety, and solve various problems related to manhole access and transport of weight between the surface and subsurface. 
     As seen in  FIG.  1   , an embodiment of the manhole guard with two wings, when assembled, permits restricted access to an uncovered manhole. Restricted access, like that shown in  FIG.  1   , is important for the safe transportation of materials and personnel between the surface and subsurface through a manhole. 
     Referring now to  FIGS.  1 - 4   , an example embodiment of a manhole guard  2  generally has a plurality of sections connected for movement, the sections including a center section  10 , a first wing  100 , and a second wing  200 . The connection for movement allows, for example, the first wing  100  and the second wing  200  to rotate around an axis defined by a first post  12  and a second post  14 , respectively. This allows the manhole guard  2  to fold flat upon itself for easy transport, assembly, and storage. 
     The center section  10  has a first post  12  and a second post  14  that are connected by at least one center rail  16 . In some embodiments, the first post  12  and the second post  14  are connected by multiple center rails  16 ,  18 ,  20 . In one non-limiting example, the manhole guard  2  has three center rails (an upper center rail  18 , a middle center rail  16 , and a lower center rail  20 ) extending between, and connecting, the first post  12  and the second post  14 . In use, the first post  12  and the second post  14  rest on the ground or other surface in proximity to a manhole. 
     A first wing  100  is pivotably or hingedly connected to the first post  12  such that the first wing  100  can rotate around the axis defined by the first post  12 . The first wing  100  has a first wing post  112  that connects to the first post  12  of the center section  10  by at least one first wing rail  116 . In some embodiments, the first wing post  112  is connected to the first post  12  by multiple first wing rails  116 ,  118 ,  120 . By way of a non-limiting example, the first wing  100  may include an upper first wing rail  118 , a middle first wing rail  116 , and a lower first wing rail  120 , all of which extend between, and connect, the first wing post  112  and the first post  12 . 
     A second wing  200  is pivotably or hingedly connected to the second post  14  such that the second wing  200  can rotate around the axis defined by the second post  14 . The second wing  200  has a second wing post  214  that connects to the second post  14  of the center section  10  by at least one second wing rail  216 . In some embodiments, the second wing post  214  is connected to the second post  14  by multiple second wing rails  216 ,  218 ,  220 . By way of a non-limiting example, the second wing  200  may include an upper second wing rail  218 , a middle second wing rail  216 , and a lower second wing rail  220 , all of which extend between, and connect, the second wing post  214  and the second post  14 . 
     The first post  12  has at least one first post hinge  22  comprising an internal pivot and external pivot which permit radial rotation of the first wing  100  around the axis defined by the first post  12 . Alternatively, the first post hinge  22  can be a hollow circular end of the center rail  16  that the first post  12  runs through in a manner so as to allow the rotation of the first post  12  in the hollow circular end. Similarly, the second post  14  has at least one second post hinge  24  comprising an internal pivot and external pivot which permit radial rotation of the second wing  200  around the axis defined by the second post  14 . Alternatively, the second post hinge  24  can be a hollow circular end of the center rail  16  that the second post  14  runs through in a manner so as to allow the rotation of the second post  14  in the hollow circular end. The first post  12  may further include an upper first post hinge  26  and a lower first post hinge  28 , and the second post  14  may further include an upper second post hinge  30  and a lower second post hinge  32 . Any hinge may further include a welded gusset for added strength and rigidity. 
     In some embodiments, the height of each wing&#39;s lower rail  120 ,  220 , middle rail  116 ,  216 , and upper rail  118 ,  218 , relative to the height of the lower center rail  20 , middle center rail  16 , and upper center rail  18 , is independently customizable. By way of a non-limiting example, in one embodiment, such as depicted in  FIG.  1   , the first upper wing rail  118  is at a height relative to the ground or other surface equal to that of the upper second wing rail  218 , which is different from that of the upper center rail  18 . 
     In some embodiments, in order to prevent access to an open manhole, one or more (preferably two) chains can be run from the first wing  100  to the second wing  200 . The chains are attached at one end to the first wing post  112 , and at the other end to the second wing post  214 . The chains can be made of stainless steel or any other suitable material. At one of the wing posts  112 ,  214 , each chain can be connected to a clip hanging off a ring welded to the wing post  112 ,  214 . At the other wing post  112 ,  214 , each chain can removably clip to a ring affixed to the wing post  112 ,  214 . In use, the chains are simply clipped onto the wing post  112 ,  214  to which they are not already affixed, thereby creating a barrier that hinders access to the manhole which the manhole guard  2  surrounds. 
     In another embodiment, the manhole guard  2  has a third wing in addition to the center section  10 , first wing  100 , and second wing  200 . The third wing can be attached to the first wing post  112  and second wing post  214  to entirely surround an uncovered manhole and obstruct any access to the manhole. Embodiments containing a third wing thus provide for enhanced safety surrounding an open manhole. 
     In some embodiments, the manhole guard  2  has one or more support rails  34  that reinforce the manhole guard structure. Generally, a support rail  34  can be utilized to connect any wing rail to an adjacent post or wing post. Furthermore, a support rail  34  can be utilized to connect any wing rail  116 ,  118 ,  120 ,  216 ,  218 ,  220  to any rail or wing post in the same wing. By way of one non-limiting example, and as depicted in  FIG.  1   , a support rail  34  can connect any of: the upper first wing rail  118  to the first wing post  112 , the upper second wing rail  218  to the second wing post  214 , the upper second wing rail  218  to the second post  14 , and the upper first wing rail  118  to the first post  12 . Support rails  34  can also be utilized to connect the lower first wing rail  120  to the first post  12 , the lower first wing rail  120  to the first wing post  112 , the lower second wing rail  220  to the second post  14 , or the lower second wing rail  220  to the second wing post  214 . By utilizing one or more support rails  34  to connect a wing rail to an adjacent wing post, the entire manhole guard structure can be reinforced. 
     In an alternative embodiment, instead of using support rails  34 , the upper first wing rail  118 , the first post  12 , and the first wing post  112  can be manufactured as one solid piece with a slight curve where the first post  12  meets the upper first wing rail  118 , and where the first wing post  112  meets the upper first wing rail  118 . Similarly, the upper second wing rail  218 , the second post  14 , and the second wing post  214  can be manufactured as one solid piece with a slight curve where the second post  14  meets the upper second wing rail  218 , and where the second wing post  214  meets the upper second wing rail  218 . This method of manufacturing the manhole guard reduces the costs production, and can result in increased stability of the manhole guard. 
     As depicted in  FIGS.  1 - 2   , the manhole guard  2  may include a first arm  122  and a second arm  222  that operate independently of each other. The first arm  122  is connected to the center section  10  on the center rail  16 , and is capable of locking the first wing  100  into a fixed position relative to the center section  10 . The second arm  222  is connected to the center section  10  on the center rail  16 , and is capable of locking the second wing  200  into a fixed position relative to the center section  10 . The independent operation of each arm allows for a variety of possible configurations of the manhole guard  2 , thereby permitting the user to alter the access to the uncovered manhole for transport purposes or to account for any obstruction where the manhole is located. For example, the first arm  122  can be utilized to lock the first wing  100  in a fixed position relative to the center section  10  while the second wing  200  is not locked in a fixed position relative to the center section  10 , and vice versa. 
     As seen in the embodiment of  FIG.  2   , the first arm  122  and second arm  222  are pivotably or hingedly connected to a center rail  16  of the center section. In embodiments where the center section  10  has multiple center rails, the first arm  122  and the second arm  222  are generally connected to the middle center rail  16  for optimal stability of the manhole guard  2 . By way of a non-limiting example, in one embodiment, the first arm  122  and the second arm  222  each has a plurality of hinged attachments  124   a ,  124   b ,  224   a ,  224   b  to the center rail  16  of the center section  10 . Multiple points of connection between the first arm  122  and center rail  16 , and the second arm  222  and the center rail  16 , lead to a stronger, longer-lasting attachment of each arm  122 ,  222  to the center rail  16  and ensure better distribution of force throughout an arm  122 ,  222  when the arm  122 ,  222  is in use. In other embodiments, due to the fact that the first arm  122  and the second arm  222  operate independently, the first arm  122  and the second arm  222  can be connected to different rails in the center section  10 . As a non-limiting example of such an embodiment, the first arm  122  can be connected to the center section  10  at the center rail  16  while the second arm  222  is connected to the center section  10  at the upper center rail  18 . As another non-limiting example, the second arm  222  can be connected to the center section  10  at the upper center rail  18  while the first arm  122  is connected to the center section  10  at the lower center rail  20 . 
     The hinged attachment of the first and second arms  122 ,  222  to a rail in the center section  10  permits the first and second arms  122 ,  222  to each independently move between an unlocked position and a locked position. In the unlocked position, each arm  122 ,  222  can be co-planar with the center section  10  (i.e., the arm can be parallel to the first and second posts  12 ,  14 ), but even if the arm is not fully co-planar with the center section  10 , the respective wing can be unlocked. That is, so long as the arm  122 ,  222  is not in a locked position, the corresponding wing  100 ,  200  is free to rotate about the axis of the respective post  12 ,  14 . In the locked position, as depicted in  FIG.  1    and  FIG.  7   , the arm  122 ,  222  is attached to the corresponding wing  100 ,  200 , thereby preventing the wing  100 ,  200  from rotating about the axis of the respective post  12 ,  14 . In the locked position, the first or second arm  122 ,  222  locks the respective wing  100 ,  200  in place with respect to the center section  10 . In certain embodiments, the locked position preferably results in the first wing  100  extending at an angle α of about 90 degrees from the center section  10 , and the second wing  200  extending at an angle β of about 90 degrees from the center section  10 , such that the three sections  10 ,  100 ,  200  form three sides of a square. It is understood, however, that the lengths of the center section  10 , first wing  100 , and second wing  200  (L, L 1 , and L 2 , respectively) need not be equal, in which case the preferable locked position forms a rectangle instead of a square. In certain embodiments, the first and second arms  122 ,  222  are configured such that the manhole guard  2  can fold flat on itself when the arms  122 ,  222  are in a specific unlocked position, as depicted in part in  FIG.  2   . 
     In some embodiments, each arm  122 ,  222  is separable from the manhole guard  2 . However, several benefits are recognized by a pivotable or hinged attachment of each arm  122 ,  222  to the manhole guard  2  in general. A pivotable or hinged attachment prevents an arm or arms from being misplaced or lost. Furthermore, a pivotable or hinged attachment of the arms  122 ,  222  facilitates easier transport and assembly of the manhole guard  2  because there are fewer parts to carry and connect when the arms  122 ,  222  are attached. 
     In some embodiments, the first arm  122  and the second arm  222  have telescopically fitted extensions. The extensions permit the arms to be expanded and contracted as necessary. As a result, the manhole guard  2  is capable of assuming a variety of configurations while maintaining stability due to the first and second arms  122 ,  222  reinforcing the manhole guard structure. 
     As depicted in  FIGS.  3 A- 3 B , the first and second arms  122 ,  222  each have a hinged end  128 ,  228  that attaches to the center section  10  (preferably, though not necessarily, at the center rail  16 ), and a wing end  130 ,  230  that attaches to the respective wing  100 ,  200 . The hinged end  128 ,  228  is typically a metal railing that can be attached to the center section  10  through the use of multiple hinges  124   a ,  124   b ,  224   a ,  224   b  which assist in more evenly displacing force throughout the manhole guard  2 . The wing end  128 ,  228  defines a latch mechanism  132 ,  232  coupled with a curved capping  134 ,  234  portion designed to fit securely over at least half the circumference of the wing rail  116 ,  216  being locked into place, as illustrated in  FIGS.  3 A- 3 B . In some embodiments, the first arm  122  and second arm  222  each has at least one support arm  136 ,  236  that connects the arm&#39;s hinged end  128 ,  228  to the arm&#39;s wing end  130 ,  230 . In one non-limiting example, the support arm  136 ,  236  creates a triangular reinforcement between the respective arm&#39;s hinged end  128 ,  228  and wing end  130 ,  230 . 
     The first and second arms  122 ,  222  can each include a latch mechanism (a first latch mechanism  132  and a second latch mechanism  232 , respectively) located at the wing end  130 ,  230 . In an alternative embodiment, only one of the arms  122 ,  222  includes a latch mechanism  132 ,  232 . Each latch mechanism  132 ,  232  permits the respective wing  100 ,  200  to be securely fastened to the center section  10 . This ensures the manhole guard  2  remains in a fixed and stable position, which is important for weighted transportation by a hoist device. In certain embodiments, the latch mechanism  132 ,  232  is attached to the respective arm  122 ,  222  by a ball joint. 
     Each latch mechanism  132 ,  232  may have a hood  138 ,  238  housing the curved capping portion  134 ,  234 , a spring  140 ,  240 , a bolt  142 ,  242 , a latch  144 ,  244 , and a trigger  146 ,  246 . The spring  140 ,  240  spans the bolt  142 ,  242 . The spring-bolt combination can be in an unloaded or loaded state. To transition from an unloaded state to a loaded state, the trigger  146 ,  246  is depressed, which increases tension on the spring  140 ,  240  and thereby loads the latch mechanism  132 ,  232 . The tension engages the latch  144 ,  244  which locks the latch  144 ,  244  onto a welded ridge on the wing rail  116 ,  216  and secures the curved capping portion  134 ,  234  to the wing rail  116 ,  216 . In the alternative, the spring  140 ,  240  begins in the loaded position, in which case releasing the trigger  146 ,  246  releases tension on the spring  140 ,  240  and thus disengages the latch  144 ,  244 , thereby unlocking the latch  144 ,  244 . Regardless of whether the spring latch mechanism  132 ,  232  begins in a loaded or unloaded position, a hood  138 ,  238  covers the latch  144 ,  244  and trigger  146 ,  246  so as to protect the latch  144 ,  244  and trigger  146 ,  246  from damage. The hood  138 ,  238  is generally curved, but other shapes are possible. The first and second latch mechanisms  132 ,  232  connected to each respective arm  122 ,  222 , and the multiple-hinged connection of each arm  122 ,  222  to the center section  10 , together enable each arm  122 ,  222  to secure a wing section  100 ,  200  in a variety of configurations while still stabilizing the manhole guard  2 . 
     As seen in  FIG.  4   , any of the first post  12 , second post  14 , first wing post  112 , and/or second wing post  214  can include a telescopically fitted adjustable foot  36 . The first post  12 , second post  14 , first wing post  112 , and second wing post  214  are generally configured to rest on the ground or other surface surrounding a manhole. The telescopically fitted adjustable feet  36  can be adjusted up or down relative to the ground or other surface, such that the manhole guard  2  rests firmly and relatively flat on the ground or other surface regardless of whether the ground or other surface is uniformly level. Each adjustable foot  36  can include a ball joint that permits the adjustable foot  36  to have complete contact with an uneven surface. 
     Referring now to  FIGS.  5 - 6   , some embodiments of the manhole guard  2  may include a first hoist assembly. The first hoist assembly comprises mounting brackets  150 ,  250  designed to facilitate the use of a first hoist device  40 . For reference, these embodiments are referred to as first hoist assembly configurations of the manhole guard  2 . The mounting brackets  150 ,  250  are typically hollow to reduce weight. This ensures the mounting brackets  150 ,  250  are easily portable, durable, and simple to assemble with tools commonly held on-site. However, non-hollow mounting brackets  150 ,  250  are encompassed within the present disclosure. 
     The first hoist assembly generally includes a first mounting bracket  150  and a second mounting bracket  250 . The first mounting bracket  150  is connected to the first wing  100 , and the second mounting bracket  250  is connected to the second wing  200 . The first mounting bracket  150  has a first top recess  152 , a first middle recess  154 , and a first lower recess  156 . The first lower recess  156  is of a size, shape, and location so as to be capable of accepting one of the first wing rails  116 ,  118 ,  120  in an interference fit. In particular embodiments, the first lower recess  156  accepts the first middle wing rail  116  in an interference fit. The first middle recess  154  is of a size, shape, and location so as to be capable of accepting the first upper wing rail  118 . The first middle recess  154  can be secured to the first upper wing rail  118  by at least one first mounting plate  158  which connects to the first mounting bracket  150  with one or more bolts  38 . The first top recess  152  is of a size, shape, and location so as to be capable of accepting a first crossbar  42  of any desired diameter. 
     As seen in  FIGS.  5 - 6   , the second mounting bracket  250  has a second top recess  252 , a second middle recess  254 , and a second lower recess  256 . The second lower recess  256  is of a size, shape, and location so as to be capable of accepting one of the second wing rails  216 ,  218 ,  220  in an interference fit. In particular embodiments, the second lower recess  256  accepts the second middle wing rail  216  in an interference fit. The second middle recess  254  is of a shape, size, and location so as to be capable of accepting the second upper wing rail  218 . The second middle recess  254  can be secured to the second upper wing rail  218  by at least one second mounting plate  258  which connects to the second mounting bracket  250  with one or more bolts  38 . The second top recess  252  is of a size, shape, and location so as to be capable of accepting a first crossbar  42  of any desired diameter. 
     In one particular embodiment, the first mounting bracket  150  and the second mounting bracket  250  each have an “L” shaped middle recess  154 ,  254 . This “L” configuration allows the middle recess  154 ,  254  to horizontally accept an upper wing rail  118 ,  218  such that the mounting bracket  150 ,  250  can be lowered onto the upper wing rail  118 ,  218 , causing the upper wing rail  118 ,  218  to be vertically displaced in the middle recess  154 ,  254  of the mounting bracket  150 ,  250 . Once lowered, the mounting bracket  150 ,  250  sits directly on the upper wing rail  118 ,  218  in an interference fit, and the mounting bracket  150 ,  250  sits directly on the lower wing rail  116 ,  216  in an interference fit. This beneficial method of attaching the mounting brackets  150 ,  250  ensures that each mounting bracket  150 ,  250  can only be freed from the wing rails  116 ,  118 ,  216 ,  218  by applying upward force to the mounting bracket  150 ,  250 . Any downward force applied to the mounting bracket  150 ,  250 , such as during weighted operation of a hoist  40 , solidifies the attachment of the mounting bracket  150 ,  250  to the wing rails  116 ,  118 ,  216 ,  218 . 
     As seen in  FIGS.  1 ,  5 A, and  6   , first slits  160  are present at the top of the middle recess  154  of the first mounting bracket  150 , on opposing sides thereof. Similarly, second slits  260  are present at the top of the middle recess  254  of the second mounting bracket  250 , on opposing sides thereof. The presence of the slits  160 ,  260  allows for the tightening of the middle recess  154 ,  254  around the circumference of the upper wing rail  118 ,  218  so as to create a secure interference fit. The slits  160 ,  260  are elongated and extend from the top of the middle recess  154 ,  254 . When the bolts  38  securing the mounting plates  158 ,  258  to the mounting brackets  150 ,  250  are tightened, the slits  160 ,  260  permit the middle recesses  154 ,  254  to deform and pinch inward so as to form-fit the upper wing rails  118 ,  218 . 
     The first crossbar  42 , when present, extends from the first top recess  152  of the first mounting bracket  150  to the second top recess  252  of the second mounting bracket  250 . In some embodiments, as depicted in  FIG.  5 A , the top recesses  152 ,  252  are uncovered and designed to accept half of the circumference of the first crossbar  42 , with the other half of the circumference of the first crossbar  42  protruding atop the top recesses  152 ,  252 . This permits quick assembly and removal of the first crossbar  42 . In other embodiments, as depicted in  FIG.  5 B , at least one top recess  152 ,  252  is partly covered and designed to accept the entire circumference of the first crossbar  42 . In this configuration, the first crossbar  42  extends through the recess  152 ,  252  which, as a whole, reduces wiggle and provides greater stability of the first crossbar  42 . In the embodiments depicted in  FIG.  1    and  FIG.  6   , the first mounting bracket  150  has a partly covered top recess  152 , and the second mounting bracket  250  has an uncovered top recess  252 . In yet other configurations, both top recesses  152 ,  252  are partly or fully covered and designed to accept the full circumference of the first crossbar  42 . When in use with a manhole guard  2  arranged around a manhole, the first crossbar  42  extends over the open manhole. The first crossbar  42  can suspend a first hoist device  40  over the manhole, the first hoist device  40  being capable of transporting materials or people through the manhole between the surface and subsurface. 
     As depicted in  FIG.  6   , the first crossbar  42  penetrates the first top recess  152  and the second top recess  252 . This configuration helps keep the first crossbar  42  in position in the top recesses  152 ,  252  of the mounting brackets  150 ,  250 . In addition, the first top recess  152  and the second top recess  252  serve to distribute the force of the first crossbar  42  throughout the manhole guard  2  during weighted operation of the first hoist device  40 . 
     As seen in  FIGS.  5 A- 5 B , the first and second mounting plates  158 ,  258  ensure that the first mounting bracket  150  and the second mounting bracket  250  stay fastened to the first wing rails  116 ,  118  and the second wing rails  216 ,  218 , respectively, with little wiggle or movement. Furthermore, attachment of the mounting brackets  150 ,  250  to multiple wing rails provides the benefit of evenly distributing force during weighted operation of the first hoist device  40 . 
     As shown in  FIG.  5 A , certain embodiments of the manhole guard  2  further include a first winch platform  46 . The first winch platform  46  can be connected to either or both mounting brackets  150 ,  250 , on either the inner side of the mounting bracket (i.e., the side facing the manhole when the first arm  122  and second arm  222  are locking the first wing  100  and second wing  200  in a fixed position relative to the center section  10 ) or the outer side of the mounting bracket. A first winch  44  can be attached to the first winch platform  46  and can be used to operate the first hoist device  40 . Any suitable winch can be utilized with the manhole guard  2  of the present disclosure. 
     Referring now to  FIGS.  7 - 17   , some embodiments of the manhole guard  2  may include a second hoist assembly  78 . The second hoist assembly  78  may include mounting members  310 ,  410  configured to facilitate the use of a second hoist device  70 . The second hoist assembly  78  can be used independent of the first hoist assembly  48  or it can be used simultaneously with the first hoist assembly  48 . For reference, these embodiments are referred to as second hoist assembly  78  configurations of the manhole guard  2 . 
     The second hoist assembly  78  may generally include a primary mounting member  310  and a secondary mounting member  410 . The primary mounting member  310  is connected to the first wing  100  and to the first mounting bracket  150 , and the secondary mounting member  410  is connected to the second wing  200  and to the second mounting bracket  250 , in a manner that will be described in more detail below. The manhole guard  2  is still capable of folding relatively flat when the primary mounting member  310  is connected to the first wing  100  and to the first mounting bracket  150 , and the secondary mounting member  410  is connected to the second wing  200  and to the second mounting bracket  250 , as shown in  FIG.  9   . 
     Referring now to  FIGS.  10 - 12   , the primary mounting member  310  may include a primary body  312  having a primary body lower recess  314  and a primary body upper recess  316 . The primary body lower recess  314  is of a size, shape, and location so as to be capable of accepting one of the first wing rails  116 ,  118  in an interference fit. In particular embodiments, the primary body lower recess  314  accepts the first upper wing rail  118  in an interference fit. The primary body upper recess  316  is of a size, shape, and location so as to be capable of accepting a second crossbar  72  of any desired diameter. 
     The primary body lower recess  314  may be positioned on the primary body  312  at an angle relative to the position of the primary body upper recess  316  on the primary body  312 . In some embodiments, the primary body lower recess  314  extends through the primary body  312  in a direction that is transverse to the direction the primary body upper recess  316  extends through the primary body  312 . 
     The primary body  312  can be a variety of shapes and sizes. The primary body  312  typically has a hollow structure to reduce weight. This ensures the mounting members  310 ,  410  are easily portable, durable, and simple to assemble with tools commonly held on-site. However, a non-hollow primary body is encompassed within the scope of the present disclosure. In the embodiment illustrated in  FIGS.  10 - 12   , the primary body  312  has a hollow rectangular structure with the primary body lower recess  314  and the primary body upper recess  316  located at opposing ends of the primary body  312 . In these embodiments, the primary body lower recess  314  extends through the primary body  312  in a direction that is transverse to the direction the primary body upper recess  316  extends through the primary body  312 . 
     Referring now to  FIGS.  11 - 12   , the primary mounting member  310  may also include one or more arms  318 ,  330  connected to the primary body  312  for the purpose of securing the primary mounting member  310  to the first mounting bracket  150 . In the embodiments shown in  FIGS.  11 - 12   , the primary mounting member  310  includes a first primary arm  318  and a second primary arm  330  connected to opposing sides of the primary body  312  in a manner so as not to obstruct access to the primary body lower recess  314  and the primary body upper recess  316 . 
     The first primary arm  318  can be a variety of shapes and sizes. In the embodiments depicted in  FIGS.  11 - 12   , the first primary arm  318  has a general shape that may resemble a meat cleaver, and includes a first primary arm recess  328 . The first primary arm  318  may include a first primary arm body  320  and a first primary arm extension  324  extending from the first primary arm body  320 . The first primary arm body  320  may include at least one first primary arm body opening  322  for a purpose that will be described below. The first primary arm extension  324  may include a first primary arm extension opening  326  for a purpose that will be described below. The first primary arm extension  324  may have a tapered end. However, a non-tapered first primary arm extension  324  is encompassed within the scope of the present disclosure. 
     The second primary arm  330  can be a variety of shapes and sizes. Generally, the second primary arm  330  has a size and shape similar to the first primary arm  318  to facilitate cooperation between the first primary arm  318  and the second primary arm  330  in order to secure the primary mounting member  310  to the first mounting bracket  150 . In the embodiments depicted in  FIGS.  11 - 12   , the second primary arm  330  has a general shape that resembles a meat cleaver, similar to the first primary arm  318 . The second primary arm  330  may include a second primary arm body  332  and a second primary arm extension  336  extending from the second primary arm body  332 . The second primary arm body  332  may include at least one second primary arm body opening for a purpose that will be described below. The second primary arm extension  336  may include a second primary arm extension opening  338  for a purpose that will be described below. The second primary arm extension  336  may have a tapered end. However, a non-tapered second primary arm extension  336  is encompassed within the scope of the present disclosure. When the first primary arm  318  and second primary arm  330  are connected to the primary body  312 , the first primary arm extension  324  and the second primary arm extension  336  extend in the same direction such that the first primary arm extension opening  326  is aligned with the second primary arm extension opening  338  to receive a fastener. 
     As depicted in  FIGS.  11 - 12   , the primary mounting member  310  may also include a primary bridging member  340 . The primary bridging member  340  may be a piece of metal extending between the first primary arm  318  and the second primary arm  330 , connected to the first primary arm  318  at one end of the primary bridging member  340  and connected to the second primary arm  330  at a second end of the primary bridging member  340 . As best shown in  FIGS.  11 - 12   , the primary bridging member  340  is connected between the first primary arm  318  and second primary arm  330  of the primary mounting member  310  at a location on the primary mounting member  310  that positions the first primary arm recess  328  between the primary bridging member  340  and the primary body  312 . 
     As shown in  FIGS.  11 - 12   , the primary mounting member  310  also includes a second winch platform  342  for the manhole guard  2 . The second winch platform  342  may be attached to the first primary arm  318 , the primary body  312 , or both the first primary arm  318  and the primary body  312 . In the embodiments shown in  FIGS.  11 A- 11 D , the second winch platform  342  has a structure comprising an “L” shape and is attached to both the first primary arm  318  and the primary body  312 . 
     As best shown in  FIGS.  7 - 9  and  16   , the primary mounting member  310  may be connected to the first upper wing rail  118  of the first wing  100  and to the first mounting bracket  150 . The primary mounting member  310  may be fixed to the first mounting bracket  150  through the use of proper positioning and a fastener. Specifically, the first mounting bracket  150  may be positioned between the primary bridging member  340  and the first and second primary arm extension openings  326 ,  338 . Then, a fastener, such as a bolt or a pin-clip assembly, may be extended through the first and second primary arm extension openings  326 ,  328  to secure the primary mounting member  310  to the first mounting bracket  150 . 
     Referring now to  FIGS.  13 - 15   , the secondary mounting member  410  may include a secondary body  412  having a secondary body lower recess  414  and a secondary body upper recess  416 . The secondary body lower recess  414  is of a size, shape, and location so as to be capable of accepting one of the second wing rails  216 ,  218  in an interference fit. In particular embodiments, the secondary body lower recess  414  accepts the second upper wing rail  218  in an interference fit. The secondary body upper recess  416  is of a size, shape, and location so as to be capable of accepting a second crossbar  72  of any desired diameter. 
     The secondary body lower recess  414  may be positioned on the secondary body  412  at an angle relative to the position of the secondary body upper recess  416  on the secondary body  412 . In some embodiments, the secondary body lower recess  414  extends through the secondary body  412  in a direction that is transverse to the direction the secondary body upper recess  416  extends through the secondary body  412 . 
     The secondary body  412  can be a variety of shapes and sizes. The secondary body  412  typically has a hollow structure to reduce weight. This ensures the mounting members  310 ,  410  are easily portable, durable, and simple to assemble with tools commonly held on-site. However, a non-hollow secondary body  412  is encompassed within the scope of the present disclosure. In the embodiments illustrated in  FIGS.  13 - 15   , the secondary body  412  has a hollow rectangular structure with the secondary body lower recess  414  and the secondary body upper recess  416  located at opposing ends of the secondary body  412 . In these embodiments, the secondary body lower recess  414  extends through the secondary body  412  in a direction that is transverse to the direction the secondary body upper recess  416  extends through the secondary body  412 . 
     Referring now to  FIGS.  14 - 15   , the secondary mounting member  410  also includes one or more secondary arms  418 ,  430  connected to the secondary body  412  for the purpose of securing the secondary mounting member  410  to the second mounting bracket  250 . In the embodiments shown in  FIGS.  14 - 15   , the secondary mounting member  410  includes a first secondary arm  418  and a second secondary arm  430  connected to opposing sides of the secondary body  412  in a manner so as to not obstruct access to the secondary body lower recess  414  and the secondary body upper recess  416 . 
     The first secondary arm  418  can have a variety of shapes and sizes. In the embodiments depicted in  FIGS.  14 - 15   , the first secondary arm  418  has a general shape that resembles a meat cleaver. The first secondary arm  418  comprises a first secondary arm body  420  and a first secondary arm extension  424  extending from the first secondary arm body  420 . The first secondary arm extension  424  includes a first secondary arm extension opening  426  for a purpose that will be described below. The first secondary arm extension  424  may have a tapered end. However, a non-tapered first secondary arm extension  424  is encompassed within the scope of the present disclosure. 
     The second secondary arm  430  can be a variety of shapes and sizes. Generally, the second secondary arm  430  has a size and shape similar to the first secondary arm  418  to facilitate cooperation between the first secondary arm  418  and the second secondary arm  430  to secure the secondary mounting member  410  to the second mounting bracket  250 . In the embodiments depicted in  FIGS.  14 - 15   , the second secondary arm  430  has a general shape that resembles a meat cleaver, similar to the first secondary arm  418 . The second secondary arm  430  may include a second secondary arm body  432  and a second secondary arm extension  436  extending from the second secondary arm body  432 . The second secondary arm extension  436  may include a second secondary arm extension opening  438  for a purpose that will be described below. The second secondary arm extension  436  may have a tapered end. However, a non-tapered second secondary arm extension  436  is encompassed within the scope of the present disclosure. When the first secondary arm  418  and second secondary arm  430  are connected to the secondary body  412 , the first secondary arm extension  424  and the second secondary arm extension  436  extend in the same direction so that the first secondary arm extension opening  426  is aligned with the second secondary arm extension opening  438  to receive a fastener. 
     As depicted in  FIGS.  14 - 15   , the secondary mounting member  410  includes a secondary bridging member  440 . The secondary bridging member  440  may be a piece of metal extending between the first secondary arm  418  and the second secondary arm  430 , connected to the first secondary arm  418  at one end of the secondary bridging member  440  and connected to the second secondary arm  430  at a second end of the secondary bridging member  440 . 
     As best illustrated in  FIGS.  7 - 9  and  16   , the secondary mounting member  410  may be connected to the second upper wing rail  218  of the second wing  200  and to the second mounting bracket  250 . The secondary mounting member  410  may be fixed to the second mounting bracket  250  through the use of proper positioning and a fastener. Specifically, the second mounting bracket  250  may be positioned between the secondary bridging member  440  and the first and second secondary arm extension openings  426 ,  438 . Then, a fastener, such as a bolt or a pin-clip assembly, may be extended through the first and second secondary arm extension openings  426 ,  438  to secure the secondary mounting member  410  to the second mounting bracket  250 . 
     The second crossbar  72 , when present, extends from the primary body upper recess  316  of the primary mounting member  310  to the secondary body upper recess  416  of the secondary mounting member  410 . In some embodiments, the primary body upper recess  316  and the secondary body upper recess  416  are uncovered and designed to accept half of the circumference of the second crossbar  72 , with the other half of the circumference of the second crossbar  72  protruding atop the primary body upper recess  316  and the secondary body upper recess  416 . This permits quick assembly and removal of the second crossbar  72 . In other embodiments, as depicted in  FIGS.  7 A and  7 B , at least one of the primary body upper recess  316  and the secondary body upper recess  416  is partly covered and designed to accept the entire circumference of the second crossbar  72 . In this configuration, the second crossbar  72  extends through the secondary body upper recess  416  which, as a whole, reduces wiggle and provides greater stability of the second crossbar  72 . In the embodiments depicted in  FIGS.  7 A and  7 B , the secondary mounting member  410  has a partly covered secondary body upper recess  416  and the primary mounting member  310  has an uncovered primary body upper recess  316 . In yet other configurations, both the primary body upper recess  316  and the secondary body upper recess  416  are partly or fully covered and designed to accept the full circumference of the second crossbar  72 . When in use with a manhole guard  2  arranged around a manhole, the second crossbar  72  extends over the open manhole. The second crossbar  72  can suspend a second hoist device  70  over the manhole, the second hoist device  70  being capable of transporting materials or people through the manhole between the surface and subsurface. 
     As depicted in  FIGS.  16 - 17   , the second crossbar  72  penetrates the primary body upper recess  316  and the secondary body upper recess  416 . This configuration helps keep the second crossbar  72  in position in the primary body upper recess  316  and secondary body upper recess  416  of the mounting members  310 ,  410 . 
     As shown in  FIG.  17   , a second winch  74  can be attached to the second winch platform  342  of the primary mounting member  310 . One or more fasteners can be used to secure the second winch  74  to the primary mounting member  310  by inserting fasteners into the at least one first primary arm body opening  322 . A protruding portion of the second winch  74 , such as a second winch axis, can be positioned in the first primary arm recess  328  which supports the protruding portion of the second winch  74 . The second winch  74  can be used to operate the second hoist device  70 . Any suitable winch can be utilized with the manhole guard  2  of the present disclosure. 
     Referring now to  FIG.  16   , there is illustrated an embodiment of a fully assembled manhole guard  2  including a first hoist assembly  48  and a second hoist assembly  78 . The first mounting bracket  150  is aligned with the second mounting bracket  250 . A first crossbar  42  extends between the first mounting bracket  150  and the second mounting bracket  250 . A first hoist device  40  is suspended from the first crossbar  42 . In addition, the first mounting member  310  is aligned with the second mounting member  410 . A second crossbar  72  extends between the first mounting member  310  and the second mounting member  410 . A second hoist device  70  is suspended from the second crossbar  72 . 
     The first winch platform  46  and the second winch platform  342  may be on opposing sides of the manhole guard  2 . Although the first winch platform  46  and second winch platform  342  can be on the same side of the manhole guard  2 , such a configuration can be crowded and movement of each winch  44 ,  74  may be obstructed by the presence of the other winch  44 ,  74 . Therefore, it is preferable that the first winch platform  46  containing the first winch  44  is located on the second wing section  200  of the manhole guard  2  and the second winch platform  342  containing the second winch  74  is located on the first wing section  100  of the manhole guard  2 . Moreover, it is preferable that the second winch platform  342  is located on the outer side of the primary mounting member  310  so as to not interfere with operation of the second hoist device  70  and to facilitate use of the second winch  74  exterior to the manhole guard  2 . However, other configurations are encompassed within the scope of the present disclosure. 
     Referring now to  FIGS.  18 - 21   , further provided herein is a safety net  500  usable in connection with any safety barricade. As seen in  FIGS.  18 - 21   , some embodiments of a manhole guard  2  may include a safety net  500 . The safety net  500  can be configured to be removably attached to the manhole guard  2 . When attached to the manhole guard  2 , the safety net  500  is configured to block debris from entering an open manhole while workers are present. 
     The safety net  500  may be composed of a single continuous piece having a size and shape capable of covering some sections or all sections of the manhole guard  2 . In the alternative, the safety net  500  may be composed of several pieces with each individual piece having a size and shape configured to cover a specific section of the manhole guard  2 . In the embodiments shown in  FIGS.  18 - 19   , the manhole guard  2  has three sections  10 ,  100 ,  200  and each section has its own corresponding safety net  500 A,  500 B,  500 C. This beneficial configuration offers flexibility by providing a user with the option to cover any number of sections of the manhole guard  2  with a safety net  500  based on preference or need. 
     The safety net  500  may be any size and shape suitable to attach to the manhole guard  2  and block debris. In the embodiments shown in  FIGS.  18 - 19   , the manhole guard  2  has three rectangular sections and three corresponding rectangular safety nets  500 A,  500 B,  500 C. Each rectangular safety net  500 A,  500 B,  500 C has a top  502 , sides  504  and  506 , and a bottom  508 . The top  502  of the safety net  500  may include one or more rail attachment features  510  to attach the safety net  502  to a rail of the manhole guard  2 . The sides  504 ,  506  of the safety net  500  may include one or more post attachment features  512  to attach the safety net  500  to a post of the manhole guard  2 . The bottom  508  of the safety net  500  may include a high visibility toe board  514 . The rail attachment features  510  and post attachment features  512  may be any suitable fastening mechanism such as, but not limited to, Velcro, buttons, ties, harness, magnets, etc. 
     Referring to  FIGS.  18 A- 18 B , a first safety net  500 A may be attached to a first wing  100 , a second safety net  500 B may be attached to a second wing  200 , and a third safety net  500 C may be attached to a center section  10  of the manhole guard  2 . The first safety net  500 A is attached to the first wing  100  by attaching the rail attachment features  510  to one of the first wing rails  116 ,  118 ,  120  and by attaching the post attachment features  512  on one side  504  of the first safety net  500 A to the adjacent first post  12  and on the other side  506  of the first safety net  500 A to the adjacent first wing post  112 . The second safety net  500 B is attached to the second wing  200  by attaching the rail attachment features  510  to one of the second wing rails  216 ,  218 ,  220  and by attaching the post attachment features  512  on one side  504  of the second safety net  500 B to the adjacent second post  14  and on the other side  506  of the second safety net  500 B to the adjacent second wing post  214 . The third safety net  500 C is attached to the center section  10  by attaching the rail attachment features  510  to one of the center rails  16 ,  18 ,  20  and by attaching the post attachment features  512  on one side  504  of the third safety net  500 C to the adjacent first post  12  and on the other side  506  of the third safety net  500 C to the adjacent second post  14 . It is preferable to attach the safety net  500  to a rail  16 ,  18 ,  20 ,  116 ,  118 ,  120 ,  216 ,  218 ,  220  at a height no greater than the height of the safety net  500  such that the bottom  508  of the safety net  500  reaches the ground and blocks debris from entering the manhole. However, this is not strictly necessary. 
     The safety net  500  can be made of a variety of materials such as a woven material, fabric, plastic, metal, or the like. In some embodiments, the safety net  500  includes openings  516  which allow a person to see through the safety net  500 . For example, the safety net  500  shown in  FIGS.  20 - 21    is made from a woven material and contains openings  516 . In other embodiments, the safety net  500  may be made of a translucent material such as a plastic. For example, the safety net  500  depicted in  FIGS.  18 - 19    is made from a translucent plastic. The safety net  500  may also include one or more reflective materials to increase the visibility of the manhole guard  2  in order to improve safety. In the embodiments shown in  FIGS.  18 - 19   , the safety net  500  includes a reflective tape  518 . 
     While the invention has been described with reference to multiple embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the essential scope and spirit of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its essential scope. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed in the present specification, but that the invention will include all embodiments falling within the scope of the claims.