AU2022201669A1 - A mobile guard rail assembly and method of use thereof - Google Patents

Abstract

(Figure 1) The present provides a mobile guard rail assembly for use relative to a fall hazard, such as, e.g., a chassis of a mining and/or excavation vehicle being serviced. In one form, the mobile guard rail assembly includes: a base frame configured to convey the assembly along a surface; an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between a retracted position and an extended position, said upper frame having a positioning frame portion for positioning adjacent the chassis; and at least one guard rail frame mounted to the positioning frame portion for positioning at least adjacent an edge of the chassis. 1/5 950 140B 140A 900 910 , 800 1 0 120 130 132 100 Figure 1

Description

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A MOBILE GUARD RAIL ASSEMBLY AND METHOD OF USE THEREOF TECHNICAL FIELD

[0001] The present invention relates to a mobile guard rail assembly for a fall hazard. In particular, the present invention concerns a mobile guard rail assembly for a chassis of a vehicle, such as, e.g., a mining or excavation vehicle, when undergoing maintenance.

BACKGROUND

[0002] Modern mining and excavation vehicles are engineered for use in high-production mining and heavy-duty construction environments. Such vehicles typically have large vehicle frames, or chassis, in order to support a large payload capacity.

[0003] The immense size of the vehicles means that the vehicle chassis pose a serious fall hazard for mechanics or technicians when servicing the vehicles. Consequently, modern occupational health and safety laws typically require that guard rails be temporarily fitted about an upper periphery of the chassis when routine maintenance and/or repair work is being undertaken.

[0004] A problem in general with such a requirement is that in order to fit the guard rails a mechanic or technician must first access the upper surface of the chassis and individually handle and fit the guard rails, all while risking his or her own safety. Further, and once the routine maintenance and/or repair work has been undertaken, the same, or another, mechanic or technician must then again access the chassis to remove the temporary guard rails, all while again risking his or her own safety.

[0005] Afurther problem with the requirement and current practice is the time and cost spent fitting the guard rails before any actual maintenance and repair work can even be undertaken and then removing the guard rails once the work has been completed. Indeed, it will be appreciated that such a practice significantly adds to the overall downtime of the vehicle, thereby severely disrupting mine and work site operations at substantial cost.

SUMMARY OF INVENTION

[0006] Embodiments of the present invention provide a mobile guard rail assembly and method of use thereof, which may at least partially address one or more of the problems or deficiencies mentioned above or which may provide the public with a useful or commercial choice.

[0007] According to a first aspect of the present invention, there is provided a mobile guard rail assembly for use relative to a fall hazard, said assembly including: a base frame configured to convey the assembly along a surface; an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between a retracted position and an extended position, said upper frame having a positioning frame portion for positioning adjacent the fall hazard; and at least one guard rail frame mounted to the positioning frame portion for positioning at least adjacent an edge of the fall hazard.

[0008] According to a second aspect of the present invention, there is provided a mobile guard rail assembly for use relative to a chassis of a vehicle, said assembly including: a base frame configured to convey the assembly along a surface; an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between a retracted position and an extended position, said upper frame having a positioning frame portion for positioning adjacent the chassis; and at least one guard rail frame mounted to the positioning frame portion for positioning at least adjacent an edge of the chassis.

[0009] According to a third aspect of the present invention, there is provided a mobile guard rail assembly for use relative to a fall hazard, said assembly including: a base frame configured to convey the assembly along a surface; an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between a retracted position and an extended position, said upper frame having a positioning frame portion for positioning adjacent the fall hazard; and at least one guard rail frame movably mounted to the positioning frame portion for movement relative thereto for positioning the guard rail frame at least adjacent an edge of the fall hazard.

[0010] According to a fourth aspect of the present invention, there is provided a mobile guard rail assembly for use relative to a chassis of a vehicle, said assembly including: a base frame configured to convey the assembly along a surface; an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between a retracted position and an extended position, said upper frame having a positioning frame portion for positioning adjacent the chassis; and at least one guard rail frame movably mounted to the positioning frame portion for movement relative thereto for positioning the guard rail frame along at least an edge of the chassis.

[0011] Advantageously, the present invention provides a mobile guard rail assembly that can be readily be positioned adjacent a chassis of a vehicle and operated to erect a temporary barrier along an edge of the chassis of a vehicle being serviced thereby complying with occupational health and safety laws without risking the safety of a mechanic or technician. Indeed, the present invention obviates the need to temporarily fit guard rails about a periphery of a vehicle being serviced thereby reducing overall down time.

[0012] As indicated above, the mobile guard rail assembly of the present invention is for use as a barrier relative to fall hazards, such as, e.g., the chassis of vehicles, preferably the chassis of mining and/or excavation vehicles, more preferably haul trucks or rigid dump trucks. It will therefore be convenient to hereinafter describe the mobile guard rail assembly with reference to this example application as the chassis of a haul truck. However, a person skilled in the art will appreciate that the mobile guard rail assembly is capable of broader applications with any suitable fall hazard, such as, e.g., the chassis of other mining and/or excavation vehicle types, equipment and/or building structures.

[0013] Typically, the chassis may be formed from metal and may include at least one longitudinally extending side frame member. One or more transversely extending cross frame members may extend form the at least one side frame member.

[0014] Each longitudinally extending side frame member may include an outer side edge. A fall hazard may generally lie immediately outwards from the outer side edge.

[0015] The frame members may be of tubular or solid construction with a substantially rectangular-shaped cross section. The various frame members may be joined together using conventional welding.

[0016] As indicated, the assembly includes a base frame to support and convey the upper frame and the at least one guard rail frame along a surface, typically a support surface, preferably a sealed surface.

[0017] The base frame may be of any suitable size, shape and construction and may be formed from any suitable material or materials.

[0018] Generally, the base frame may be formed from metal, preferably aluminium.

[0019] The base frame may include an upper surface, an opposed lower surface, a front end, an opposed rear end and opposed sides.

[0020] The base frame may be formed from two or more frame members joined together.

[0021] For example, the base frame may include at least a pair of longitudinally extending side frame members extending between the front and rear ends. The pair of side frame members may be joined together by one or more transversely extending cross frame members.

[0022] The various frame members may be joined together using conventional welding techniques and/or with one or more mechanical fasteners.

[0023] In some embodiments, the base frame may further include an inner pair of longitudinally extending frame members extending between the front and rear ends. The inner pair may extend substantially parallel with the side frame members between the opposed ends.

[0024] The frame members may each be of tubular construction, solid construction, plate construction or any combination thereof, preferably tubular with a substantially rectangular cross section.

[0025] The base frame may preferably have an elongate shape of suitable length to support the upper frame and at least one guard rail frame. The base frame may have a length defined between the front and rear ends of about 1,250mm, about 1,500mm, about 1,750mm, about 2,000mm, about 2,250mm, about 2,500mm, about 2,750mm, or about 3,000mm.

[0026] The base frame may include wheels or tracks for moving the base frame (and conveying the upper frame and the at least one guard rail frame) along the surface. The wheels or tracks may be located on, or mounted to, an underside or lower surface of the base frame. The wheels or tracks may be mounted directly or indirectly to the base frame.

[0027] The wheels or tracks may or may not be driven by an electric motor or internal combustion engine for propelling the base frame and thereby the assembly along the surface.

[0028] In preferred embodiments, the base frame may include wheels for moving the frame along the surface. The base frame may include any suitable number of wheels. For example, the base frame may include two wheels, three wheels, four wheels, five wheels, six wheels, eight wheels or even 10 wheels.

[0029] Each wheel may include a brake so that the base frame and the assembly may be parked in a desired location.

[0030] In some such embodiments, the base frame may include at least two pairs of wheels, preferably located at or near a corner of the base frame at or near each end. Each wheel may be mounted to the base frame such that each wheel may be able to swivel about a vertical axis.

[0031] Preferably, each wheel may include a swivel caster.

[0032] The base frame preferably further includes at least one pair of guide frame members extending upwardly from the base frame for guiding movement of the upper frame between the retracted and extended positions relative to the base frame.

[0033] The guide frame members may extend upwardly from the base frame in an opposed arrangement, preferably each from a respective side of the base frame. The guide frame members may extend upwardly in a substantially vertical orientation.

[0034] The guide frame members may extend upwardly from the base frame at any suitable location along the side frame members, preferably at or near the rear end.

[0035] In preferred embodiments, the base frame may include two pairs of opposed guide frame members extending upwardly from the side frame members of the base frame at or near the rear end.

[0036] For example, a first pair of guide frame members may extend upwardly from the base frame in an opposed arrangement at the rear end, and a second pair of guide frame members may extend upwardly from the base frame in an opposed arrangement at a spaced distance from the rear end. The spaced distance may range from about 500mm to about 1,500mm from the rear end, preferably from about 500mm to about 750mm from the rear end, more preferably about 660mm from the rear end.

[0037] Each guide frame member may include a lower end, an opposed upper end and may extend longitudinally therebetween, typically in a linear direction. The lower end may be mounted, or coupled to, an upper surface of a side frame member, preferably mounted, more preferably via mounting bracket.

[0038] Each guide frame member may be of any suitable length.

[0039] Each guide frame member may have a channel for guiding movement of the upper frame, typically via one or more guide assemblies mounted to the upper frame.

[0040] The channel may be of any suitable cross sectional shape to facilitate movement of the guide assemblies along the channel.

[0041] For example, each channel may have a C- or U-shaped cross section.

[0042] Generally, each guide frame member may include three portions when viewed in cross section: a first portion, a second portion and a third portion that together form the channel.

Typically, the second portion may bridge the first and third portions. In some embodiments, an outer longitudinal edge of each of the first and third portions may partially fold or bend towards one another.

[0043] The at least one pair of guide frame members may include one or more reinforcement members for providing support along height of the guide frame members, when extending upwardly from the base frame.

[0044] The one or more reinforcement members may be of any suitable size, shape and construction and may be mounted in any suitable arrangement along the height of the guide frame members.

[0045] Each reinforcement member may include a pair of opposed ends and an elongate body extending therebetween. Each reinforcement member may have any suitable profile shape for providing support along the height of the guide frame members.

[0046] In some embodiments, the reinforcement members may transversely extend between the guide frame members.

[0047] In other embodiments, the reinforcement members may extend diagonally between the guide frame members, preferably as diagonal bracing members.

[0048] As indicated, the assembly includes an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between the retracted and extended positions.

[0049] The upper frame may be of any suitable size, shape and construction and may be formed from any suitable material or materials.

[0050] Like the base frame, the upper frame may generally be formed from metal, preferably aluminium.

[0051] Also like the base frame, the upper frame may include a front end, an opposed rear end and opposed sides.

[0052] The upper frame may be formed from two or more frame members joined together.

[0053] For example, the upper frame may include at least two pairs of vertically extending side frame members. Each pair and/or the pairs of side frame members may be joined together by one or more transversely extending cross frame members extending between the sides and/or between the front and rear ends of the upper frame.

[0054] Each vertically extending side frame member may include a pair of opposed ends and an elongate body extending therebetween, typically in a linear direction. The opposed ends may include a lower end and an opposed upper end.

[0055] In some embodiments, the side frame members may be of the same height. In other embodiments, the side frame members may be of differing heights.

[0056] In preferred embodiments, the upper frame may include a rear pair of vertically extending side frame members located at or near the rear end of the upper frame and a forward pair of vertically extending side frame members located forward of the rear pair at or near the front end of the upper frame. In such embodiments, the rear pair may have a greater height, extending between the opposed ends, than the forward pair.

[0057] The frame members may each be of tubular construction, solid construction, plate construction or any combination thereof, preferably tubular with a substantially rectangular cross section.

[0058] Likewise, the various frame members may be joined together using conventional welding techniques and/or with one or more mechanical fasteners.

[0059] As previously indicated, the upper frame may further include one or more guide assemblies mounted, or fastened, to each of the side frame members for mounting the upper frame to the guide frame members of the base frame for movement between the retracted and extended positions.

[0060] Each guide assembly may be of any suitable size, shape and construction for slidably mounting the upper frame to a channel defined by each guide frame member.

[0061] The guide assembly may typically include a guide frame member mounting portion and an upper frame mounting portion. The guide frame member mounting portion may be configured to slide along the channel defined by each guide frame member. The upper frame mounting portion may be configured to be mountable to a side of the upper frame, preferably an outer surface of a side frame member of the upper frame.

[0062] The guide frame member mounting portion may include one or more wheels, rollers, plain bearing pads or the like configured to be received within the channel defined by each guide frame member and be moveable along the channel.

[0063] In some embodiments, the upper frame mounting portion may include a clip or clamp having a pair of opposed clamping members configured to receive at least a portion of a side frame member of the upper frame therebetween to mount to the upper frame.

[0064] In other embodiments, the upper frame mounting portion may include one or more mechanical fasteners each configured to be at least partially received through one or more openings defined on the side frame members of the upper frame for mounting the guide assembly to the upper frame.

[0065] In preferred embodiments, the guide frame mounting portion of each guide assembly may include a plain bearing pad configured to be received within the channel defined by each guide frame member and be movable along the channel.

[0066] The one or more guide assemblies may be arranged in any suitable arrangement along the side frame members of the upper frame.

[0067] Generally, each side of the upper frame may include at least a pair of guide assemblies, preferably at least two pairs.

[0068] The assembly may include an actuator or actuating mechanism for slidably moving the upper frame relative to the base frame between the retracted and extended positions.

[0069] Any suitable type of actuator or actuating mechanism may be used. The actuator or actuating mechanism may be manually actuated or by using a drive, preferably the latter.

[0070] For example, if manually actuated, the actuator or actuating mechanism may include one or more of a lever, a ram, a manual winch, an operable handle or a sliding arrangement for moving the upper frame relative to the base frame.

[0071] In some embodiments, the actuator or actuating mechanism may include one or more biasing mechanisms or members so that movement to the retracted or extended positions works against the force of the biasing mechanism or member. The biasing mechanism or member may include one or more springs, such as, e.g., coil springs. Of course, a person skilled in the art will appreciate that other types of biasing mechanisms or members may be used, such as, e.g., magnets or magnetized elements and the like.

[0072] In some embodiments, the actuator or actuating mechanism may include one or more linear actuators each capable of moving between an extended position and a retracted position. The extended and retracted positions may correspond with the extended and retracted positions of the upper frame relative to the base frame.

[0073] The linear actuators may include a pneumatic ram, a hydraulic ram or a rigid chain actuator (also known as a linear chain actuator, a push-pull actuator, an electric chain actuator, a zip chain actuator or a column forming chain actuator).

[0074] In other embodiments, the actuator or actuating mechanism may include a drive motor, such as, e.g., an electric motor or combustion engine, operatively associated with a winch, a cable and at least one pulley.

[0075] Typically, in such embodiments, the winch and drive motor may be mounted to a lower portion of the base frame, the at least one pulley may be mounted to an upper portion of the base frame and the cable may extend from the winch, over the at least one pulley and be fastened or coupled to a lower portion of the upper frame.

[0076] To drive the upper frame to the extended position, the winch may wind in the cable to thereby drive the upper frame in an upward direction.

[0077] To drive the upper frame to the retracted position, the winch may let out the cable to thereby lower the upper frame.

[0078] The mobile guard rail assembly may have any suitable resting height, as defined by a height of the upper frame above the support surface when the upper frame is in the retracted position. For example, the assembly may have a resting height of about 1,500mm, about 1,600mm, about 1,700mm, about 1,800mm, about 1,900mm, about 2,000mm, about 2,100mm, about 2,200mm, about 2,300mm, about 2,400mm, about 2,500mm, about 2,600mm, about 2,700mm, about 2,800mm, about 2,900mm or even about 3,000mm.

[0079] Likewise, the mobile guard rail assembly may have any suitable extended height when the upper frame is in the extended position. For example, the assembly may have an extended height of about 2,500mm, about 2,600mm, about 2,700mm, about 2,800mm, about 2,900mm, about 3,000mm, about 3,100mm, about 3,200mm, about 3,300mm, about 3,400mm, about 3,500mm, about 3,600mm, about 3,700mm, about 3,800mm, about 3,900mm, about 4,000mm, about 4,100mm, about 4,200mm, about 4,300mm, about 4,400mm, or even about 4,500mm.

[0080] Generally, the upper frame may be at least partially received in the base frame when in the retracted position.

[0081] As indicated, the upper frame further includes a positioning frame portion for positioning the at least one guard rail frame mounted thereto adjacent the fall hazard or chassis, preferably adjacent an edge of the fall hazard or chassis.

[0082] The positioning frame portion may be of any suitable size, shape and construction, and may be formed from any suitable material or materials.

[0083] The positioning frame portion may be integrally formed with the upper frame or may be a separate sub frame joined or connected to the upper frame, typically the former.

[0084] Like a remainder of the upper frame, the positioning frame portion may generally be formed from metal, preferably aluminium.

[0085] The positioning frame portion may be formed from two or more frame members joined together.

[0086] For example, the positioning frame portion may include at least a pair of generally horizontally extending frame members extending forward from the front end of the upper frame, typically at or near the upper end of each side frame member of the upper frame.

[0087] The pair of horizontally extending frame members may extend in a substantially parallel arrangement relative to one another. Each frame member may include a proximal end mounted to the upper frame and an opposed distal end extending distally forward of the front end of the upper frame. Typically, the proximal ends of the frame member may be mounted, or connected, to the rear pair of side frame members, preferably to a side of the rear pair of side frame members.

[0088] The horizontally extending frame members may be joined together by one or more transversely extending cross frame members extending between the sides and/or between the proximal and distal ends of the positioning frame portion, preferably at least the distal ends.

[0089] The cross frame member extending between the distal ends may preferably define an alignment frame member for being at least partially aligned relative to, along, or against an edge of the fall hazard or chassis.

[0090] The frame members may be of tubular construction, solid construction, plate construction or any combination thereof, preferably tubular with a substantially rectangular cross section.

[0091] Likewise, the various frame members may be joined together using conventional welding techniques and/or with one or more mechanical fasteners.

[0092] Generally, the positioning frame portion may extend or protrude forward of the upper frame for location adjacent an edge of the fall hazard or chassis.

[0093] In some embodiments, the positioning frame portion may extend or protrude forward of the upper frame in a fixed cantilever arrangement.

[0094] In other embodiments, the positioning frame may be slidably mountable to the upper frame and moveable relative thereto in a substantially horizontal sliding arrangement between a retracted position and a protruding position.

[0095] The positioning frame portion may extend or protrude forward any suitable distance from a front end of the upper frame. For example, the positioning frame portion may extend forward or protrude from a front end of the upper frame a distance of about 750mm, about 800mm, about 850mm, about 900mm, about 950mm, about 1,000mm, about 1,050mm, about 1,100mm, about 1,150mm, about 1,200mm, about 1,250mm, about 1,300mm, about 1,350mm, about 1,400mm, about 1,450mm, about 1,500mm, about 1,550mm, about 1,600mm, about 1,650mm, about 1,700mm, about 1,750mm, about 1,800mm, about 1,850mm, about 1,900mm, about 1,950mm, or even about 2,000mm. Typically, the positioning frame portion may extend forward of the front end of the upper a distance ranging from about 1,000mm to about 2,000mm, preferably from about 1,250mm to about 1,750mm, more preferably about 1,550mm.

[0096] Like with a remainder of the upper frame, the positioning frame portion may include one or more reinforcement members for supporting the positioning frame portion at it extends forward from the upper frame.

[0097] The one or more reinforcement members may be of any suitable size, shape and construction and may be mounted in any suitable arrangement along a length of the horizontally extending frame members forming the positioning frame portion.

[0098] Each reinforcement member may include a pair of opposed ends and an elongate body extending therebetween. Each reinforcement member may have any suitable profile shape for providing support along the height of the guide frame members.

[0099] In some embodiments, the reinforcement members may extend between the horizontally extending frame members forming the positioning frame portion and the side frame members forming a remainder of the upper frame.

[00100] In other embodiments, the reinforcement members may extend between the horizontally extending frame members and an upper end of the rear pair of side frame members of the upper frame, preferably as bracing members.

[00101] As mentioned, the assembly includes at least one guard rail frame mounted to the positioning frame portion for positioning at least adjacent an edge of a fall hazard or chassis, preferably as a temporary barrier.

[00102] The at least one guard rail frame may be of any suitable size, shape and construction and may be formed from any suitable material or materials to, in use, function as a barrier.

[00103] Like the base frame and the upper frame, the guard rail frame may generally be formed from metal, preferably aluminium.

[00104] The guard rail frame may be of unitary construction or may be formed from two or more frame members joined together, preferably the latter.

[00105] For example, in some embodiments, the at least one guard rail frame may include at least one guard rail extending above the distal end of the positioning frame portion, preferably in a substantially parallel arrangement with the alignment frame member. The at least one guard rail may be supported above the distal end by two or more support frame members extending in a generally vertical orientation between the at least one guard rail and the distal end, preferably the alignment frame member.

[00106] In some such embodiments, the at least one guard rail frame may include two or more guard rails extending above the distal end of the positioning frame portion, preferably in a substantially parallel arrangement relative to one another and the distal end. The two or more guard rails may extend substantially parallel to one another in a spaced arrangement. Again, the rails may be supported above the distal end by two or more support frame members extending in a generally vertical orientation between the rails and the distal end, preferably the alignment frame member.

[00107] In other embodiments, the at least one guard rail frame may include at least two guard rails extending parallel to one another in a generally horizonal orientation and joined together by two or more support frame members extending therebetween, preferably in a generally vertical orientation. A lowermost guard rail of the guard rail frame may be mounted to the distal end of the positioning frame portion, preferably the alignment frame member.

[00108] The at least one guard rail frame may be mounted in any suitable way relative to the distal end of the positioning frame portion, preferably the alignment frame member.

[00109] For example, in some embodiments the at least one guard rail frame may be fixedly mounted to the distal end of the positioning frame portion, preferably such that the at least one guard rail frame extends at least partially across the distal end, preferably entirely across. The at least one guard rail frame maybe fixedly mounted using any suitable means known in the art, such as, e.g., using conventional welding techniques and/or with one or more mechanical fasteners.

[00110] In other embodiments, the at least one guard rail frame may be movably mounted to the distal end of the positioning frame portion and moveable relative thereto, typically via translation and/or rotation, or pivotable.

[00111] For example, in some such embodiments, the at least one guard rail frame may be slidably movable between a resting, or retracted position, and an extended position to one or either side of the positioning frame portion.

[00112] Likewise, in other or the same such embodiments, the at least one guard rail frame may be pivotable relative to the positioning frame portion.

[00113] The at least one guard rail frame and the positioning frame portion may be movably mounted to one another using any suitable means known in the art.

[00114] The at least one guard rail frame may be directly or indirectly movably mounted to a distal end of the positioning frame portion, preferably the alignment frame member.

[00115] For example, in some such embodiments, the alignment frame member may include a channel defined thereon and the at least one guard rail frame may be slidably mounted to the channel, typically via one or more rollers or guide assemblies as previously described.

[00116] The channel may provide guided or directional conveyance of the guard rail frame in linear direction relative to the positioning frame portion, preferably to one or either side. The channel may be as previously described.

[00117] In other such embodiments, the assembly may have at least two guard rails frames, including a first guard rail frame fixedly mounted to a distal end of the positioning frame portion and a second guard rail frame movably mounted to the first guard rail frame and moveable relative thereto, again typically via translation and/or rotation, or pivotable.

[00118] For example, in one such embodiment the first guard rail frame may have a channel defined thereon and the second guard rail frame may be slidably mounted to the channel, typically via one or more rollers or guide assemblies. The channel and the one or more roller or guide assemblies may be as previously described.

[00119] Conversely in another such embodiment, the second guard rail frame may have a channel defined thereon and the first guard rail frame may include, or be mounted to, a mounting bracket having one or more one or more rollers or guide assemblies for slidably mounting the second guard rail frame relative to the first guard rail frame via the channel. Again, the channel and the one or more roller or guide assemblies may be as previously described.

[00120] In use, the first and second guard rail frames may be slidably mounted together such that the second guard rail may be slidably moveable relative to the first guard rail frame between a retracted position in which the guard rail frames at least partially overlap one another and an extended position in which the second guard rail frame at least partially slides outwards, or laterally, relative to the first guard rail frame, typically to one or both sides of the positioning frame portion.

[00121] In further such embodiments, the mounting bracket may be pivotally mounted to the first guard rail frame, preferably such that the outer side of the second guard frame may pivotable between raised and lowered positions relative to the first guard rail frame and the positioning frame portion.

[00122] The mounting bracket may be pivotally mounted to the first guard rail frame in any suitable way that allows the bracket and the second guard rail frame slidably mounted thereto to pivot about a pivot point between the raised and lowered positions.

[00123] Likewise, the mounting bracket may be pivotally mountable to any suitable location on the first guard rail frame, preferably to a side of the first guard rail frame, more preferably about mid-way along a height of an outermost support frame member.

[00124] In one such embodiments, the side of the first guard rail frame may have a mounting point and the mounting bracket may have a bearing connectable to the mounting point for pivotally coupling the mounting bracket to the first guard rail frame. The mounting point may include a flange portion with an opening defined therein and the bearing may be pinned to the mounting point with a pivot pin configured to be at least partially received through the opening in the flange portion. The bearing may include a polymer bushing, preferably a high-density polyethylene (HDPE) bushing.

[00125] The second guard rail frame may be pivotable to any suitable angle relative to the first guard frame. For example, the first guard rail frame may be pivotable to an angle of about ±5°, about ±6, about ±7, about ±8, about ±9, about±100 , about±11,about±12°,about±13, about ±14,about ±15,about ±16,about±17,about ±18,about ±19,about±20°,about±21°, about ±22°,about ±23°,about ±24°,about±250,about ±26,about ±27,about±28,about±29, about ±300,about ±310,about±32,about ±33, about ±340, about ±35, about ±360,about ±37, about ±380, about ±39, about ±40, about ±410, about ±42, about ±43, about ±44 or about ±450 relative the first guard frame.

[00126] The assembly may further include one or more actuators or actuating mechanisms for slidably moving the guard rail frame relative to the distal end of the positioning frame portion and/or the second guard rail frame relative to the first guard rail frame.

[00127] Likewise, the assembly may further include one or more actuators or actuating mechanisms for pivoting the second guard rail frame relative to the first guard rail frame (and the assembly).

[00128] Any suitable type of actuator or actuating mechanism may be used. The actuator or actuating mechanism may be manually actuated or by using a drive, preferably the latter.

[00129] For example, if manually actuated, the actuator or actuating mechanism may include one or more of a lever, a ram, a manual winch, an operable handle or a sliding arrangement for moving the guard rail frame relative to the distal end of the positioning frame portion and/or the second guard rail frame relative to the first guard rail frame.

[00130] In some embodiments, the actuator or actuating mechanism may include one or more biasing mechanisms or members so that movement may work against the force of the biasing mechanism or member. The biasing mechanism or member may include one or more springs, such as, e.g., coil springs. Of course, a person skilled in the art will appreciate that other types of biasing mechanisms or members may be used, such as, e.g., magnets or magnetized elements and the like.

[00131] In some embodiments, the actuator or actuating mechanism may include one or more linear actuators each capable of moving between an extended position and a retracted position.

[00132] In some such embodiments, the extended and retracted positions of the actuators may respectively correspond to the extended and retracted slidable positions of the guard rail frame relative to the distal end of the positioning frame portion and/or the second guard rail frame relative to the first guard rail frame.

[00133] In other such embodiments, the extension and retraction of the actuators may respectively correspond to pivoting of the second guard rail frame relative to the first guard rail frame between the raised and lowered positions.

[00134] For example, in such embodiments the at least one linear actuator may extend between the mounting bracket and a distal end of the protruding frame portion. When the linear actuator extends, the outer side of the second guard rail frame may pivot to a raised position relative to the first guard rail frame. Conversely, when the linear actuator retracts, the outer side of the second guard rail frame may pivot to a lowered position, preferably level with the first guard rail frame.

[00135] The linear actuators may include a pneumatic ram, a hydraulic ram or a rigid chain actuator (also known as a linear chain actuator, a push-pull actuator, an electric chain actuator, a zip chain actuator or a column forming chain actuator).

[00136] In other embodiments, the actuator or actuating mechanism may include a drive motor, such as, e.g., an electric motor or combustion engine, operatively associated with a winch, a cable and at least one pulley.

[00137] In some embodiments, the at least one guard frame may include a clamp or clip having a pairof opposed clamping members forclamping to an edge of the chassis orfall hazard, preferably when the at least one guard frame is slidably extended or pivoted relative to the positioning frame portion.

[00138] In related embodiments, the second guard frame may include a clamp or clip having a pair of opposed clamping members for clamping to an edge of an adjacent chassis or fall hazard, again preferably when the second guard frame is slidably extended and/or pivoted relative to the first guard frame member.

[00139] The clamp or clip may preferably be provided on a lowermost guard rail frame or the lower end of an outermost support frame member.

[00140] Advantageously, the clamp or clip may at least partially further stabilise the at least one guard rail frame relative to the edge of the chassis or fall hazard.

[00141] In some embodiments, the assembly may include one or more stabilisers for stabilising the assembly in place, particularly when the upper frame and/or at least one of the guard rail frames are in extended positions.

[00142] The stabilisers may be of any suitable size, shape and constructions and may be located in any suitable location on the base frame to engage with an underlying support surface.

[00143] For example, the one or more stabilisers may be located at or near the front end and/or the rear end of the base frame, preferably both.

[00144] Generally, each stabiliser may include a leg and a foot. The leg may be mounted to the base frame and the foot may be slidably moveable relative to the leg between an extended position in which the foot engages the support surface and a retracted position in which the foot is held clear of the support surface. Typically, each stabiliser may include screwjack for moving the foot between the extended and retracted positions.

[00145] In some embodiments, the assembly may include one or more counterweights for stabilising the upper frame and/or at least one of the guard rail frames when in extended positions.

[00146] The counterweights may be of any suitable size, shape and construction and may be located in any suitable location.

[00147] Generally, the counterweights may be adjustable, preferably mounted to the rear end of the base frame.

[00148] In some embodiments, the counterweights may be in the form of one or more plates mountable to the rear end of the base frame, preferably in a stacked arrangement.

[00149] In some embodiments, the assembly may include one or more retaining members for retaining the access frame relative to the base frame in the retracted position, the extended position or any position therebetween.

[00150] The retaining members may be of any suitable size, shape and construction.

[00151] Generally, the retaining members may include one or more pins or bolts configured to be received in one or more corresponding openings for retaining the upper frame in a desired position relative to the base frame.

[00152] In some such embodiments, one or both of the first pair of guide frame members of the base frame and the corresponding rear pair of side frame members of the upper frame may each include a plurality of spaced openings extending at least partially along their respective heights. Suitably, each guide frame member and side frame member may be retained in a desired position relative to one another by inserting one or more pins or bolts through co-aligned openings. The one or more pins or bolts may preferably be spring-loaded pins or bolts.

[00153] In other such embodiments, one or both of the first pair of guide frame members may include one or more pins or bolts mounted thereto and one or both of the corresponding side frame members slidably mounted to the guide frame members may include a plurality of spaced openings extending at least along their respective heights. In use, the upper frame may be retained in a desired position relative to the base frame by inserting one or more of the pins or bolts through a selected said opening. Again, the one or more pins or bolts may preferably be spring-loaded.

[00154] In some embodiments, the assembly may further include one or more sensors for detecting when the upper frame and/or the at least one guard rail frame are overextended and/or when there is resistance to movement of one part of the assembly relative to another, such as, e.g., the upper frame relative to the base frame.

[00155] In some embodiments, the assembly may further include a microcomputer, including one or more processors and a memory, for receiving and processing signals from the one or more sensors and optionally generating a signal to alert a user and/or disabling operation of the assembly (e.g., isolating one or more of the actuators or actuating mechanisms).

[00156] In some embodiments, the assembly may further include a power source. The power source may include an on-board power source, such as, e.g., one or more batteries, and/or may receive power from an external source.

[00157] In some embodiments, the assembly may include a communications module for connecting the assembly with an external device, such as, e.g., an external processing device (e.g., a computer, tablet, smart phone, smart watch and/or PDA), an external display or a storage device (e.g., a hard drive). The assembly may be connectable to an external device in any suitable way.

[00158] For example, the communications module may be in the form of a port or access portion (e.g., a USB or a mini-USB port) such that the assembly may be connectable to an external device using a suitable cable.

[00159] For example, the communications module may be in the form of a wireless communications module, such as, e.g., a wireless network interface controller, such that the assembly may wirelessly connect to an external device through a wireless network (e.g., Wi-Fi (WLAN) communication, RF communication, infrared communication or Bluetooth T M).

[00160] In some embodiments, the assembly may further include a controller for controlling operation of the various actuators or actuating mechanisms and thus movement of any one of the upper frame relative to the base frame, the guard rail frame relative to the distal end of the positioning frame portion, and the second guard rail frame relative to the first guard rail frame.

[00161] The controller may be of any suitable size, shape and configuration.

[00162] The controller may be a remote controller or may be associated with the assembly.

[00163] For example, in some embodiments, the controller may be in the form of one or more switches, dials or levers located on the assembly. The one or more switches, dials or levers may be electrically connected to the one or more actuators or actuating mechanisms.

[00164] In other embodiments, the controller may be a remote controller configured to be held by a user, for example. The remote controller may be wired remote or a wireless remote. The remote controller may include one or more keys, buttons or dials for controlling various aspects of functionality of the assembly, including the one or more actuators or actuating mechanisms. In some embodiments, the remote controller may include a display for displaying operating information of the assembly, such as, e.g., speed of movement.

[00165] According to a fifth aspect of the present invention, there is provided a method of erecting a barrier relative to a fall hazard with the mobile guard rail assembly of the first aspect, said method including: positioning the assembly relative to the fall hazard; and aligning the protruding frame portion relative to an edge of the fall hazard such that the guard rail frame is positioned at least adjacent the edge of the fall hazard as the barrier.

[00166] According to a sixth aspect of the present invention, there is provided a method of erecting barrier relative to a chassis of a vehicle with the mobile guard rail assembly of the second aspect, said method including: positioning the assembly relative to the chassis of the vehicle; aligning the protruding frame portion relative to the chassis such that the guard rail frame is positioned at least adjacent an edge of the chassis as the barrier.

[00167] According to a seventh aspect of the present invention, there is provided a method of erecting a barrier relative to a fall hazard with the mobile guard rail assembly of the third aspect, said method including: positioning the assembly relative to the fall hazard; aligning the protruding frame portion relative to an edge of the fall hazard; and moving the at least one guard rail frame relative to the protruding portion such that the guard rail frame is positioned at least adjacent the edge of the fall hazard as the barrier.

[00168] According to an eighth aspect of the present invention, there is provided a method of erecting barrier relative to a chassis of a vehicle with the mobile guard rail assembly of the fourth aspect, said method including: positioning the assembly relative to the chassis of the vehicle; aligning the protruding frame portion relative to the chassis; and moving the at least one guard rail frame relative to the protruding portion such that it is positioned along at least an edge of the chassis as the barrier.

[00169] The methods of the fifth to eighth aspects may include one or more characteristics or features of the assembly as hereinbefore described.

[00170] Any of the features described herein can be combined in any combination with any one or more of the other features described herein within the scope of the invention.

[00171] The reference to any prior art in this specification is not and should not be taken as an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge.

BRIEF DESCRIPTION OF DRAWINGS

[00172] Preferred features, embodiments and variations of the invention may be discerned from the following Detailed Description which provides sufficient information for those skilled in the art to perform the invention. The Detailed Description is not to be regarded as limiting the scope of the preceding Summary of Invention in any way. The Detailed Description will make reference to a number of drawings as follows:

[00173] Figure 1 is a schematic drawing showing a mobile guard rail assembly according to an embodiment of the present invention being operated to erect a temporary barrier along an edge of a chassis of a vehicle;

[00174] Figure 2 is an upper perspective view of the mobile guard rail assembly as shown in Figure 1;

[00175] Figures 3A and 3B are side views respectively showing the mobile guard rail assembly as shown in Figures 1 and 2 in the extended and retracted positions;

[00176] Figure 4 is a photograph showing a rear view of the mobile guard rail assembly as shown in Figures 1, 2, 3A and 3B with a guard rail frame in an extended position;

[00177] Figure 5 is a photograph showing a front view of the mobile guard rail assembly as shown in Figure 4 with an upper frame in an extended position; and

[00178] Figure 6 is a photograph showing a rear view of the mobile guard rail assembly as shown in Figure 5 with the guard rail frame pivoted in a raised position.

DETAILED DESCRIPTION

[00179] Figures 1 to 6 show a mobile guard rail assembly (100) according to an embodiment of the present invention.

[00180] Referring to Figure 1, the mobile guard rail assembly (100) is configured to be positioned adjacent a chassis (900) of a vehicle (950) and operated to erect a temporary barrier along an edge (910) of the chassis (900) of the vehicle (950).

[00181] As shown, the chassis (900) is typically of a haul truck or rigid dump truck and the guard rail assembly (100), in use, provides a temporary barrier against a fall hazard off the edge (910) of the chassis (900).

[00182] The guard rail assembly (100) includes a base frame (110) configured to convey the assembly along surface (800); and an upper frame (120) slidably mountable to the base frame (110) and moveable relative thereto in a substantially vertical orientation between a retracted or lowered position and an extended or raised position as shown.

[00183] The upper frame (120) further includes a positioning frame portion (130) for positioning adjacent the chassis (900) two guard rail frames (140) mounted thereto.

[00184] The two guard rail frames (140) include a first guard rail frame (140A) fixedly mounted to a distal end (132) of the positioning frame portion (130) and a second guard rail frame (140B) movably mounted to the first guard rail frame (140A) and both slidably and pivotably moveable relative thereto for positioning the second guard rail frame (140B) along the edge (910) of the chassis (900).

[00185] Referring to Figure 2, the base frame (110) is formed from metal and includes a front end (112), an opposed rear end (114) and opposed sides (116).

[00186] The base frame (110) is assembled from a pair of longitudinally extending side frame members (212) extending between the front and rear ends (112, 114) and defining the sides (116). The pair of side frame members (212) are joined together by a pair of cross frame members (214) extending between the respective ends of the side frame members (212) and defining the front and rear ends (112, 114).

[00187] The frame members (212, 214) are of tubular construction with a substantially rectangular cross section and are joined together using conventional welding techniques.

[00188] As shown, the base frame (110) has an elongate shape with a length as defined between the front and rear ends (112, 114) of about 2,000mm.

[00189] The base frame (110) includes wheels (220) for moving the frame (110) along the surface (not shown). Each wheel (220) includes a brake so that the base frame (110) and the assembly (100) can be parked in a desired location.

[00190] The base frame (110) further includes four guide frame members (230) extending upwardly in a substantially vertical orientation from the base frame (110) for guiding movement of the upper frame (120) between the retracted and extended positions relative to the base frame (110).

[00191] The guide frame members (230) extend upwardly from the base frame (110) in opposed pairs from the respective sides (116) of the base frame (110) at a rear end portion of the base frame (110).

[00192] Each guide frame member (230) provides a channel (232) for guiding movement of the upper frame (120) via one or more guide assemblies (240) mounted to the upper frame (120).

[00193] As indicated, the upper frame (120) is slidably mounted to the base frame (110) and moveable relative thereto in a substantially vertical orientation between the retracted (lowered) and extended (raised) positions.

[00194] Like the base frame (110), the upper frame (120) is formed from metal and includes a front end (122), an opposed rear end (124) and opposed sides (126).

[00195] The upper frame (120) is assembled from two pairs of vertically extending side frame members (250) joined together by one or more transversely extending cross frame members.

[00196] Each vertically extending side frame member (250) includes a pair of opposed ends and an elongate body extending therebetween in a linear direction. The opposed ends include alowerend and an opposed upperend.

[00197] Specifically, the upper frame (120) includes a rear pair of vertically extending side frame members (250A) located at the rear end (124) of the upperframe (120) and a forward pair of vertically extending side frame members (250B) located forward of the rear pair at the front end (122) of the upper frame (120). The rear pair has a greater height than the forward pair.

[00198] Like the base frame (110), the frame members (250) are of a tubular construction with a substantially rectangular cross section and joined together using conventional welding techniques.

[00199] The upperframe (120) further includes one or more guide assemblies (240) mounted to each of the side frame members (250) for mounting the upper frame (120) to the guide frame members (230) of the base frame (110) for movement between the retracted and extended positions.

[00200] Each guide assembly (240) is configured to be slidingly received in the channel (232) defined by each guide frame member (230).

[00201] Each guide assembly (240) includes a guide frame member mounting portion and an upper frame mounting portion. The guide frame member mounting portion is configured to slide along the channel (232) defined by each guide frame member (230). The upper frame mounting portion is configured to be mountable to an outer surface of a side frame member (250) of the upper frame (110).

[00202] The guide frame member mounting portion includes one or more nylon bearing pads configured to be received within the channel (232) defined by each guide frame member (230) and be moveable along the channel (232).

[00203] The upper frame mounting portion includes one or more mechanical fasteners for fastening the guide frame member mounting portion to a side frame member (250) of the upper frame (120).

[00204] Referring to Figures 3A and 3B, the assembly (100) further includes a hydraulic ram (310) for slidably moving the upper frame (120) relative to the base frame (110) between the retracted and extended positions.

[00205] As shown in Figure 3B, the mobile guard rail assembly (100) has a lowered height, as defined by a height of an upper end of the forward pair of side frame members (250B) of the upper frame (120) above the support surface when the upper frame (120) is in the retracted position of about 2,300mm.

[00206] Likewise, and referring to Figure 3A, the mobile guard rail assembly (100) has a raised height when the upper end of the side frame members (250B) of the upper frame (120) is in the extended position of about 3,200mm above the support surface.

[00207] Referring back to Figure 2, the upper frame (120) further includes a positioning frame portion (130) for positioning the guard rail frames (140) mounted thereto adjacent an edge of the chassis (not shown).

[00208] The positioning frame portion (130) is integrally formed with the upper frame (120).

[00209] The positioning frame portion (130) is formed from metal and is assembled from a pair of generally horizontally extending frame members (134) extending forward from the front end (122) of the upper frame (120).

[00210] The pair of horizontally extending frame members (134) extend in a substantially parallel arrangement relative to one another and are joined together at the distal end (132) and proximal end by one or more transversely extending cross frame members (136). The distal cross frame member defines an alignment frame member (260) for being at least partially aligned relative to an edge of the chassis (not shown).

[00211] Again, the frame members (134, 136, 260) are of tubular construction with a substantially rectangular cross section and are joined together using conventional welding techniques.

[00212] Generally, the positioning frame portion (130) extends or protrudes forward of the upper frame (120) for location adjacent an edge of the chassis (not shown).

[00213] The positioning frame portion (130) extends forward a distance of about 1,524mm from the front end (122) of the upper frame (120).

[00214] As mentioned, the assembly (100) includes two guard rail frames (140) mounted to the distal end (132) of the positioning frame portion (130) for in use providing a temporary barrier along an edge of the chassis (not shown).

[00215] Each guard rail frame (140) is formed from metal and is assembled from at least a pair of guard rail frames (142) extending substantially parallel with and above the alignment frame member (266) of the positioning frame portion (260) and joined together by at least two generally vertical support frame members (144).

[00216] Again, the frame members (142, 144) are of tubular construction with a substantially rectangular cross section and are joined together using conventional welding techniques.

[00217] As indicated, the first guard rail frame (140A) is fixedly mounted to the alignment frame member (266) of the positioning frame portion (130) and the second guard rail frame (140B) is movably mounted to the first guard rail frame (140A) and both slidably and pivotably moveable relative thereto for positioning the second guard rail frame (140B) along an edge of a chassis (not shown).

[00218] Specifically, and with reference to Figures 4 and 5, the second guard rail frame (140B) has a channel (145) defined thereon and the first guard rail frame (140B) is mounted to a mounting bracket (270) having one or more one or more rollers or guide assemblies for slidably mounting the second guard rail frame (140B) relative to the first guard rail frame (140B) via the channel (145).

[00219] Further and with reference to Figure 6, the mounting bracket (270) is pivotally mounted to the first guard rail frame (140A) such that an outer side of the second guard frame (140B) is pivotable between raised and powered positions relative to the first guard rail frame (140A).

[00220] Referring back to Figure 4, the assembly (100) includes a hydraulic ram (410) for slidably moving the second guard rail frame (140B) relative to the first guard rail frame (140A).

[00221] Likewise and referring again to Figure 6, the assembly (100) further includes a hydraulic ram (610) extending between the mounting bracket (270) and the distal end (132) of the protruding frame portion (130) for pivoting the outer side of the second guard rail frame (140B) between the raised position as shown and a lowered position, as shown in Figures 4 and , relative to the first guard rail frame (140A) in which the second guard rail frame (140B) is level with the first guard rail frame (140A).

[00222] As shown, the assembly further includes a clamp (620) extending from an outer lower edge of the second guard rail frame (140B) for clamping to an edge of the chassis (not shown), when the second guard rail frame (140B) is slidably extended and/or pivoted relative to the first guard rail frame (140A).

[00223] Advantageously, the clamp (620) at least partially stabilises the second guard rail frame (140B) relative to an edge of the chassis (not shown).

[00224] In the present specification and claims (if any), the word 'comprising' and its derivatives including 'comprises'and 'comprise'include each of the stated integers but does not exclude the inclusion of one or more further integers.

[00225] Reference throughout this specification to 'one embodiment' or 'an embodiment' means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearance of the phrases 'in one embodiment' or 'in an embodiment' in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more combinations.

[00226] In compliance with the statute, the invention has been described in language more or less specific to structural or methodical features. It is to be understood that the invention is not limited to specific features shown or described since the means herein described comprises preferred forms of putting the invention into effect. The invention is, therefore, claimed in any of its forms or modifications within the proper scope of the appended claims (if any) appropriately interpreted by those skilled in the art.

Claims (21)

1. A mobile guard rail assembly for use relative to a chassis of a vehicle or a fall hazard, said assembly including: a base frame configured to convey the assembly along a support surface; an upper frame slidably mountable to the base frame and moveable relative thereto in a substantially vertical orientation between a retracted position and an extended position, said upper frame having a positioning frame portion for positioning adjacent the chassis; and at least one guard rail frame movably mounted to the positioning frame portion for movement relative thereto for positioning the guard rail frame along at least an edge of the chassis or the fall hazard.

2. The assembly of claim 1, wherein the at least one guard rail frame is slidably mounted to the positioning frame portion and configured to be slidably moveable relative thereto between a retracted position in which the at least one guard rail frame rests above a distal end of the positioning frame portion and an extended position in which the guard rail frame extends at least partially to a side of the distal end of the positioning frame portion.

3. The assembly of claim 1 or claim 2, wherein the at least one guard rail frame is pivotally mountable to the distal end of the positioning frame portion such that an outer end of the at least one guard rail frame is pivotable between raised and lowered positions.

4. The assembly of any one of claims 1 to 3, wherein the bases frame includes wheels or tracks for moving the base frame along the surface.

5. The assembly of any one of claims 1 to 4, wherein the base frame includes at least one pair of guide frame members extending upwardly from the base frame for guiding movement of the upper frame between the retracted position and the extended position relative to the base frame.

6. The assembly of claim 5, wherein the at least one pair of guide frame members includes a first pair of guide frame members extending upwardly from the base frame in an opposed arrangement at a rear end of the base frame and a second pair of guide frame members extending upwardly from the base frame in an opposed arrangement at a spaced distance from the rear end.

7. The assembly of claim 5 or claim 6, wherein each guide frame member includes a channel or guiding movement of the upper frame via one or more guide assemblies mounted to the upper frame.

8. The assembly of claim 7, wherein the one or more guide assemblies mounted to the upper frame each include a guide frame member mounting portion configured to slide along the channel defined by each guide frame member and an upper frame mounting portion.

9. The assembly of claim 8, wherein the guide frame member mounting portion includes any one of wheels, rollers and plain bearing pads.

10. The assembly of any one of claims 1 to 9, further including an actuatorfor slidably moving the upper frame relative to the base frame between the retracted position and the extended position.

11. The assembly of claim 10, wherein the actuator includes any one of pneumatic ram, a hydraulic ram and a rigid chain actuator.

12. The assembly of claim 10, wherein the actuator includes drive motor, a winch operatively associated with the drive motor, a cable and at least one pulley and wherein the drive motor and winch are mounted to a lower portion of the base frame, the at least one pulley is mounted to an upper portion of the base frame and the cable extends from the winch over the at least one pulley to a lower portion of the upper frame and is fastened or coupled thereto.

13. The assembly of any one of claims 1 to 12, wherein the upper frame is at least partially received in the base frame when in the retracted position.

14. The assembly of any one of claims 1 to 13, wherein the positioning frame portion includes at least a pair of generally horizontally extending frame members extending forward from the front end of the upper frame in a substantially parallel arrangement relative to each other and one or more transversely extending cross frame members extending between the sides and/or between proximal and/or distal ends of the positioning frame portion.

15. The assembly of any one of claims 1 to 14, wherein the positioning frame portion extends or protrudes forward of the upper frame in a fixed cantilever arrangement.

16. The assembly of any one of claims 1 to 15, wherein the at least one guard rail frame is moveable between a retracted position and an extended position relative to the positioning frame portion for positioning the at least one guard rail frame along the at least an edge of the chassis or the fall hazard.

17. The assembly of claim 16, wherein the at least one guard rail frame is any one of slidable and pivotal relative to the positioning frame portion.

18. The assembly of claim 16 or claim 17, wherein the at least one guard rail frame includes a first guard rail frame fixedly mounted to the positioning frame portion and a second guard rail frame movably mounted to the first guard rail frame and moveable relative thereto.

19. The assembly of claim 18, wherein the first guard rail frame includes a mounting bracket and the second guard rail frame is slidably mounted to the mounting bracket so as to be slidably moveable relative to the first guard rail frame between a retracted position in which the first and second guard rail frames at least partially overlap each other and an extended position in which the second guard rail frame at least partially slides outwards relative to the first guard rail frame.

20. The assembly of claim 19, wherein the mounting bracket is pivotally mounted to the first guard rail frame such that an outer side of the second guard rail frame is pivotable between raised and lowered positions relative to the first guard rail frame and the positioning frame portion.

21. A method of erecting a barrier relative to a chassis of a vehicle or a fall hazard with the mobile guard rail assembly of any one of claims 1 to 20, said method including: positioning the assembly relative to the chassis or the fall hazard; aligning the protruding frame portion relative to an edge of the chassis or the fall hazard; and moving the at least one guard rail frame relative to the protruding portion such that the at least one guard rail frame is positioned along at least the edge of the chassis or the fall hazard as the barrier.

Date: 10 March 2022