Cleaning Equipment and Systems

Abstract

The present invention relates to an unmanned cleaning device for cleaning structures such as buildings, more particularly windows of buildings. The unmanned cleaning device comprises a carriage, a cleaning element rotatably mounted on the carriage, at least one pair of support arms, at least one pair of powered ducted fans, a motor remotely operable to rotate the cleaning element about its horizontal axis across the surface to be cleaned in use, and a spray boom mounted on the carriage. The present invention further provides a cleaning system comprising the unmanned cleaning device described above and a portable winch member.

Description

[Technical field]

[0001] The present invention relates to a cleaning device for cleaning structures such as buildings, and more particularly windows of buildings, the cleaning device being configured to be stable relative to the structure during operation, and the present invention also relates to a cleaning system incorporating the cleaning device described herein. [Background technology]

[0002] Buildings, especially high rise buildings in urban areas, are generally tedious and time consuming to clean, and in particular their windows. Often, a window cleaner will tie a climbing rope to a roof anchor on the building and sling the rope over the side of the building. The cleaner then equips himself with a climber's harness and effectively rappels down the building's surface, cleaning the windows with a water / soap bucket as he descends the building structure.

[0003] Cleaning buildings can prove to be extremely dangerous, especially tall buildings in windy environments.

[0004] It is therefore an object to provide a portable architectural cleaning device that allows for cleaning of relatively flat surfaces, particularly elevated and / or inclined and / or vertical surfaces, without the use of lifted / suspended personnel at a particular cleaning location, or at least to provide the public with a useful option. Summary of the Invention

[0005] In a first aspect, there is provided an unmanned cleaning apparatus suitable for cleaning a surface of a structure, the unmanned cleaning apparatus comprising: a carriage configured to be moved vertically relative to a surface of the structure; a cleaning element rotatably mounted to the carriage and configured to rotate, in use, about a substantially horizontal axis, the cleaning element being configured to contact the surface; at least one pair of support members attached to the carriage for supporting the unmanned cleaning device relative to the surface; at least one pair of powered ducted fans, one of each pair located at each end of the carriage, and together the pair of powered ducted fans, in use, providing a pushing force on the carriage in a direction towards the surface to be cleaned to stabilize the unmanned cleaning device relative to the surface to be cleaned; a motor remotely operable to rotate, in use, the cleaning element about its horizontal axis across the surface to be cleaned; a spray boom mounted to said carriage and provided with a plurality of spaced apart spray nozzles for spraying water, in use, towards said cleaning elements and towards the surface of the structure being cleaned.

[0006] In one aspect, the unmanned cleaning device comprises at least one hanging member located adjacent to an upper surface of the carriage, the hanging member being connected, in use, to a winch rope which, in use, connects the unmanned cleaning device to a winch which moves the carriage upwards or downwards as required.

[0007] In one embodiment, the support members are a pair of wheels mounted on the carriage. In a preferred embodiment, two pairs of wheels are the support members, each of the wheels mounted adjacent a respective corner of the carriage.

[0008] In one embodiment, each of the pair of wheels or pairs of wheels is mounted on an adjustable depth track configured to allow fore-and-aft movement of each wheel relative to the cleaning element.

[0009] In one aspect, two pairs of powered ducted fans are provided, one of the powered ducted fans of each pair located at each end of the carriage, and each of the powered ducted fans at each end of the carriage are spaced apart about the horizontal axis of the cleaning element.

[0010] In one aspect, the electric ducted fan is battery powered and can operate independently of any external power source.

[0011] In one aspect, the cleaning element is a rotatable brush.

[0012] In one aspect, the pair of powered ducted fans together provide a total pushing force of at least 5% of the weight of the unmanned cleaning device, more preferably at least 10% of the weight of the unmanned cleaning device.

[0013] In one aspect, the unmanned cleaning device includes a battery-powered motor that drives the cleaning elements independent of any external power source.

[0014] In another aspect, there is provided a cleaning system comprising an unmanned cleaning apparatus as defined above and a portable winch member configured, in use, to raise and lower said unmanned cleaning apparatus up and down over a surface to be cleaned and which, in use, is positioned on a surface above a surface to be cleaned by said unmanned cleaning apparatus.

[0015] In one aspect, the portable winch member is connected to roof rigging or a roof mounted lifting device above the surface to be cleaned by the unmanned cleaning device.

[0016] In an alternative embodiment, the portable winch member is provided on the unmanned cleaning apparatus.

[0017] In one aspect, the unmanned cleaning apparatus further comprises a portable winch member configured, in use, to raise and lower the unmanned cleaning apparatus up and down over a surface to be cleaned and which, in use, is positioned on a surface above the surface to be cleaned by the unmanned cleaning apparatus.

[0018] In another aspect, there is provided an unmanned cleaning apparatus suitable for cleaning a surface of a structure, the unmanned cleaning apparatus comprising: a carriage configured to be moved vertically relative to a surface of the structure; a cleaning element rotatably mounted to the carriage and configured to rotate, in use, about a substantially horizontal axis, the cleaning element being configured to contact the surface; at least one pair of support members attached to the carriage for supporting the unmanned cleaning device relative to the surface; at least one pair of side members configured and adapted to support lateral movement of the carriage across a surface of the structure, in use; a motor remotely operable to rotate, in use, the cleaning element about its horizontal axis across the surface to be cleaned; a spray boom mounted to said carriage and provided with a plurality of spaced apart spray nozzles for spraying water, in use, towards said cleaning elements and towards the surface of the structure being cleaned.

[0019] In one aspect, the at least one pair of side members comprises swing arms extending outwardly from the carriage, preferably each swing arm comprising a secondary movement member at a distal end thereof.

[0020] In one embodiment, the unmanned cleaning device comprises at least two pairs of side members.

[0021] In one aspect, the unmanned cleaning device further comprises at least one pair of powered ducted fans, one of each pair located at each end of the carriage, and the pair of powered ducted fans together, in use, provide a pushing force on the carriage in a direction towards the surface to be cleaned to stabilize the unmanned cleaning device against the surface to be cleaned. Preferably, two pairs of powered ducted fans are provided, one of each pair located at each end of the carriage, and each of the powered ducted fans at each end of the carriage are spaced apart about the horizontal axis of the cleaning element.

[0022] In one aspect, the electric ducted fan is battery powered and can operate independently of any external power source.

[0023] In one aspect, the pair of powered ducted fans together provide a total pushing force of at least 5% of the weight of the unmanned cleaning device, more preferably at least 10% of the weight of the unmanned cleaning device.

[0024] In one aspect, the unmanned cleaning device includes a battery-powered motor that drives the cleaning elements independent of any external power source.

[0025] In one aspect, the unmanned cleaning device includes a battery-powered motor that drives the cleaning elements independent of any external power source.

[0026] In one aspect, the cleaning element is a rotatable brush.

[0027] In one aspect, the unmanned cleaning device further comprises a winch member attached to the carriage for facilitating up and down movement of the carriage relative to the surface of the structure, in use.

[0028] Further aspects and embodiments will become apparent by reference to the following drawings and description. The embodiments shown herein are provided for the purpose of illustrating certain embodiments and aspects of the invention and are not intended to limit the invention in any way. Those skilled in the art will be able to utilize the disclosure and teachings herein to generate other embodiments, aspects, and variations without undue experimentation. Any such embodiments, aspects, and variations are considered to be part of the present invention. [Brief description of the drawings]

[0029] A cleaning device will now be described, by way of non-limiting example, with reference to the accompanying drawings, in which: [Figure 1] FIG. 2 is a schematic front perspective view of the cleaning device. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 2 is a schematic front perspective view of the carriage removed from the cleaning device. [Figure 7] FIG. 4 is a left side view of the carriage removed from the cleaning device. [Figure 8] FIG. 4 is a right side view of the carriage removed from the cleaning device. [Figure 9] FIG. 4 is a rear view of the carriage removed from the cleaning device. [Figure 10] 1 is a rear perspective view of the cleaning device connected to a water supply source. [Figure 11] 1 is a front perspective view of the cleaning device in operation while connected to a water supply; [Figure 12] 1 is a side view of the cleaning device suspended from a winch system on the ground against an upright surface. [Figure 13] FIG. 2 is a top perspective view of a portable rigging system for use with the cleaning machine of the present invention; [Figure 14] FIG. 14 is a side view of the portable rigging system shown in FIG. 13. [Figure 15] FIG. 13 is a left side view of another embodiment of the cleaning device, with the side members extending outwardly. [Figure 16] FIG. 16 is a schematic front view of the embodiment of FIG. 15. [Figure 17] FIG. 16 is a left side view of the embodiment of FIG. 15 with the side members retracted inwardly. [Figure 18] FIG. 16 is a top view of the embodiment of FIG. 15 with the side members partially extended outwardly. [Figure 19] FIG. 16 is a left side view of the embodiment of FIG. 15 with the access port open. [Figure 20] FIG. 16 is a front view of the embodiment of FIG. [Figure 21] FIG. 16 is a rear view of the embodiment of FIG.

[0030] When considering the drawings, particularly the schematic diagrams, the proportions shown and the specific locations of elements are not intended to be limitations on the disclosed structures or the scope of the claims appended hereto, but are intended to illustrate the general concept. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The present invention provides a mobile and portable cleaning device that allows cleaning of relatively flat surfaces, particularly high and / or inclined and / or vertical surfaces, without the use of personnel lifted or suspended at a specific cleaning position. With reference to Figures 1 and 2, the cleaning device 1 typically comprises a frame or carriage 2 that holds at least a cleaning element 3, which may be comprised of a number of members, i.e. "bristle" members or flexible brushing members, having outer ends that contact the surface area to be cleaned, and in use the cleaning element rotates about an axis 4 driven by a motor and gearbox unit 5. The bristle members may be formed from foam, like an automatic car wash brush. The motor and gearbox 5 is appropriately sized to drive the cleaning element in one or more directions as required by the operator, and to rotate the cleaning element at a speed suitable for the surface to be cleaned. One or more pairs of support members, i.e. wheels 6, 7, are provided to support the cleaning device against the surface to be cleaned. One pair of wheels 6 is located adjacent a lower corner of the carriage and the other pair of wheels 7 is located adjacent an upper corner of the carriage. The wheels 6 and 7 are preferably located on the carriage outside the width of the cleaning element / brush 3. The wheels are preferably mounted on tracks 6a and 7a. The tracks allow the position of each wheel to be adjusted in forward and rearward positions relative to the cleaning element and the surface to be cleaned. Such wheel adjustability allows the contact pressure of the bristle members of the cleaning element 3 against the surface to be varied. The adjustment of the position of each wheel may be automated if there is a surface obstacle that needs to be overcome. This automated adjustment may be achieved using sensors similar to those used in car wash systems. Alternatively, the adjustment may be made by an operator using a remote control. The upper side of the carriage is provided with one or more suspension members or lifting tabs 8. The underside of the carriage is provided with two or more caster wheels 9 that allow the cleaning device 1 to move across the ground.As best seen in FIG. 2, two pairs of motorized ducted fan units 10, 11 are positioned adjacent each end of the shaft 4. Together, each pair of fans provides a forward thrust on the carriage towards the rotating brushes in use of at least 5 kg, preferably 8 kg, more preferably 10 kg. The overall weight of the cleaning device is preferably about 100 kg. The motorized ducted fan units are EDF JETFAN-120 eco Ejets + HET 800-68-830 fans, available from https: / / www.turbines-rc.com. These motorized ducted fans provide significant stability to the cleaning device, allowing it to be operated and moved over structures or surfaces at relatively high speeds. In a preferred embodiment, the fans use low voltage (approximately 24-48V) brushless DC motors. A corresponding rechargeable battery power supply 12, 13 is also provided at the rear of the carriage 2 to power these fans, any winch that may be provided on the cleaning device, and any electronics that may also be provided, such as warning lights or sound devices. Figures 3, 4 and 6 show a further suspension member 14 located at the rear of the cleaning device, which, together with the lifting tabs 8, may provide a three-way suspension arrangement by connecting strops or the like. With reference to Figures 10 and 12, it can be seen that the cleaning device may be lifted using a three-way strop system. Figures 10 and 11 also show that a lightweight shroud 15 covers the carriage 2 to prevent residual water from spraying from the rear of the cleaning device, away from the surface to be cleaned. The shroud is preferably formed from a strong, lightweight material such as carbon fiber. As shown in Figures 6, 7, 8 and 9, the shroud 15 is removed to expose the carriage framework 2 which supports the shroud and the cleaning device components. Additionally, framework 2 is adapted and configured to provide strength and shape to the cleaning apparatus, it being understood that framework 2 can be configured in a variety of ways to support the shroud and components of the cleaning apparatus, and the illustrated embodiment is just one way in which framework 2 may be configured.The cleaning apparatus 1 is moved up and down relative to the surface of the building (not shown) by a portable winch that is mounted on the top of the building and connected to the cleaning apparatus via a rope or cable (not shown) connected to a lifting tab 8. The winch is preferably portable, self-retracting, has a long cable and is equipped with variable speed control. The winch may be located on a roof system, such as a roof rigging system, that provides additional control of movement along a horizontal direction relative to the surface to be cleaned. Alternatively, the winch may be supported on the cleaning apparatus, allowing the cleaning apparatus itself to be raised and lowered up or down any surface.

[0032] Furthermore, electronic installations can be made to allow remote adjustments and computer-automated operation. One such installation is a location monitoring system that provides a remote operator or building owner with statistics on the current location of the cleaning element across a designated surface and on progress as a percentage. It is understood that the rooftop system may be integrated into the building infrastructure or may be a portable lifting or rigging frame installed for the cleaning operation, and the winch is attached on-site to an available rooftop system. In this way, the rooftop system and winch can be used to control the up and down movement of the cleaning device 1, while the rooftop system supports and controls the horizontal movement of the cleaning device across the building surface.

[0033] A portable rigging system 30 suitable for use with the cleaning apparatus of the present invention is shown in Figures 13 and 14. A boom 31 is supported on a pair of wheeled frame members 32, 33 adjacent each end of the boom. The boom 31 includes a mounting plate 34 to which a winch (not shown) can be attached so that, in use, the cleaning apparatus can be winched up and down a structure by means of a winch cable. The frame member 32, which is furthest from the surface of the structure to be cleaned in use, includes a series of counterweight members 35, such as counterweights, to provide some counterbalance to the weight of the cleaning apparatus. The frame member 32 also includes a power box 36 for providing power to the winch. The frame member 33, which supports the end of the boom that is arranged to extend along the side of the structure, also supports a pulley 37 through which the winch cable passes. The furthest end of the boom includes a further pulley 38 at which the winch cable bends as it descends to the cleaning apparatus. Preferably, the portable rigging system is modular and easy to assemble and disassemble, and more preferably, the portable rigging system should have no components longer than 2 metres in length, allowing the components to be transported to their rooftop installation location using the building's existing lifting system.

[0034] Whether the cleaning element rotates clockwise or counterclockwise in use is entirely optional. For example, when viewed from the left side of the cleaning element, it may be preferred that the cleaning element rotates in a clockwise direction when the cleaning device is being raised on the surface to be cleaned, and in a counterclockwise direction when the cleaning device is lowered on the surface to be cleaned. One advantage of the cleaning device of the present invention is that initial testing has shown that it can clean architectural surfaces 50% faster than other cleaning methods. This advantage is due to the cleaning device being relatively light (approximately 100 kg) and being able to move quickly and efficiently throughout a building system due to the pushing force provided by the powered ducted fans. These fans provide significant stability to the cleaning device, allowing it to operate and move across a structure or surface at relatively high speeds. In a preferred embodiment, the fan uses a low voltage (approximately 24-48 V) brushless DC motor. The fan acts vertically towards the surface to be cleaned, providing sufficient pushing force to improve stability. A significant advantage of this system is that the force required to keep the cleaning brush in contact with the surface being cleaned is self-generated by the cleaning apparatus, eliminating the need for ropes or wires running to the ground to control and maintain contact of the cleaning brush with the surface being cleaned.

[0035] The components of the cleaning device are constructed from materials based on structural needs, taking into consideration aspects such as strength, weight reduction, durability, etc. Common structural materials that can be selected include metals, especially aluminum, stainless steel, polymeric materials, composite materials, ceramics, etc.

[0036] Typically, most window cleaning is done with or in conjunction with the application of fluids, especially water, and therefore the above mentioned cleaning devices require a fluid delivery system. Spray cleaning systems, brush cleaning systems, roller applicators / scrubbing systems, fabric applicators, rag applicators, and combinations thereof all use water to facilitate removal of surface soils and to minimize friction between any physical element and the surface being cleaned, reducing abrasion and scratching. The fluid can be water, treated water (e.g., demineralized water, deionized water, chemically treated water), or otherwise aqueous based (surfactants, amphiphilic substances that remain with the water but dissolve or soften hydrophobic and oleophilic substances), and other common cleaning fluids (ammonia, vinegar, etc.). In a preferred embodiment, a hose 16 (shown in Figures 10, 11 and 12) is connected to the carriage and supplies water through a series of spaced spray heads or nozzles 40 arranged along the upper frame of the carriage above the cleaning elements as best seen in Figures 1, 2 and 11, which spray water onto the rotating brush and the surface to be cleaned. The hose is connected to the cleaning device by a quick release (push on and lock) connection, although other connections are contemplated, such as a threaded hose connection. The hose can be connected at the ground to a pump (electric or fuel-powered) used to pump the water, or it can be connected from the top of the structure to be cleaned. Alternatively, a water pump or water blaster can be used to push the water through the nozzle or spray head of the cleaning device. It should be understood that there are many ways to apply the liquid to the surface to be cleaned. The applicator can be a spray device, a jet spray, a squirt spray, a roller brush, a reciprocating fabric sheet, water and air jets, a squeegee system, and the like, as will be well understood by those skilled in the art. It is preferable to be able to adequately apply the liquid without the need for extensive pressure systems.

[0037] During experimental trials of the cleaning device, users have confirmed that the cleaning device is easy to install, easy to deploy to clean upright surfaces, and can clean exterior building surfaces relatively quickly and easily, saving many man-hours in installing the system and cleaning the building. The reduction in man-hours means that buildings can be cleaned more cost-effectively than with conventional systems. Furthermore, users have confirmed that the cleaning device is particularly stable in high winds (15-25 knots), where window cleaning is not typically performed. An advantage of this motorized ducted fan stabilization system is that it does not require a heavy counterweight system or ropes extending from the ground to the carriage to hold the cleaning device against the surface to be cleaned. The light weight of the cleaning device also means that it is easy to install from a balcony or canopy roof without the need for expensive scaffolding or extra manpower.

[0038] By using the cleaning system described herein, a cleaning system can be provided for cleaning relatively flat surfaces, such as the exterior vertical surfaces of office buildings, hotels, hospitals, etc., without requiring personnel to be suspended from the structure.

[0039] The surface to be cleaned is typically configured as glass or coated glass (e.g., surfaces having an abrasion resistant coating, a light filtering coating, an enhanced cleanable surface, etc.), but any structure having a relatively flat surface can be suitably cleaned. The actual cleaning is performed by applying the cleaning fluid to the surface with sufficient force from the cleaning element or bristle member to assist in the removal of dirt, film, particles, debris, deposits, etc. from the surface. Glass will be the primary surface to be cleaned, but any surface material such as concrete, mortar, brick, stone, metal, wood, composites, etc. may also be cleaned. In the case of porous or highly absorbent surfaces, a jet spray may be particularly desirable. Preferred application systems include brush application, sponge application, strip application, foam finger application, sheet application, etc., where a physical element exerts a physical force, such as a rubbing action, on the surface to be cleaned in the presence of the cleaning fluid (which may be water only).

[0040] It can be seen that the cleaning system, including the above-described cleaning equipment, winch, and optional power cables and hoses, can be easily transported to and from multiple buildings. This provides a portable building cleaning system that can be easily used on many buildings without the need for workers to be suspended from the building structure. Thus, the disclosed cleaning system provides significant health and safety advantages over any cleaning system that requires workers to be suspended from the building. In another aspect, the present invention provides a free-standing, mobile, portable cleaning apparatus that allows for cleaning of relatively flat surfaces, particularly elevated and / or inclined and / or vertical surfaces, without the use of lifted or suspended personnel at a particular cleaning location.

[0041] With reference to Figures 15 to 21, a second embodiment of a cleaning device 101 is shown. The cleaning device comprises a carriage or framework 102 (preferably a skeletal framework to minimize the weight of the cleaning device) that holds at least one cleaning element 103, which may be comprised of a number of members or "bristle" members or flexible brushing members 125 having outer ends that contact the surface area to be cleaned, and which rotate in use about a shaft 104 driven by at least one motor or gearbox unit 105. In the embodiment shown in Figure 20, the cleaning device comprises two motor or gearbox units 105, 105a. In the embodiment shown, the motor gearbox units 105, 105a are located adjacent to each end of the shaft 104. The motor or gearbox units may be protected by a cover (not shown). The bristle members 125 may be made of foam, like automatic car wash brushes. The motor gearbox is appropriately sized to drive the cleaning element in one or more directions as required by the operator and rotate the cleaning element at a speed appropriate for the surface to be cleaned. It should be understood that the shaft 104 may be driven by one or more motor or gearbox units and the illustrated embodiment is only one way of driving the shaft 104. One or more pairs of support members or wheels 106, 107 are provided to support the cleaning device against the surface to be cleaned. One pair of wheels 106 is located adjacent a lower corner of the carriage and the other pair of wheels 107 is located adjacent an upper corner of the carriage. The wheels 106, 107 are preferably located on the carriage outside the width of the cleaning element / brush. Each wheel 106, 107 is preferably mounted on a track 106a, 107a. Each track allows the position of the wheels to be adjusted in forward and rearward positions relative to the cleaning element and the surface to be cleaned. Such adjustment of the wheels allows for varying the contact pressure of the cleaning element's bristle members 125 against the surface. Adjustment of the position of each wheel may be automated if there are surface obstacles that need to be overcome.This automated adjustment may be achieved using sensors similar to those used in car wash systems. Alternatively, an operator may use a remote control to make the adjustments. Each of the wheels 106, 107 is preferably mounted in a partial cavity 112 (as shown in FIG. 19) that is complementary in shape to the wheel. The underside of the carriage is provided with two or more caster wheels 110a, 122 that allow the cleaner 101 to move across the ground. The caster wheels 110a may be attached directly to the cleaner 101 or may be attached to the cleaner via the legs 110. The caster wheels may include a manually actuated braking mechanism 110b. One or more pairs of side members 108, 109 are provided. The side members are attached to both ends of the carriage. The side members may be attached to the carriage in complementary cavities 108b, 109b. Each side member preferably includes a swing arm extending outwardly from the carriage. In the embodiment shown, each swing arm includes a secondary transfer member 108a, 109a at its distal end. Each secondary transfer member may be a roller member, such as a wheel, as shown in FIG. 19.

[0042] The cleaning device may further include actuators (such as rotary actuators) (not shown) for selectively adjusting the position of the side members relative to the cleaning element and the surface to be cleaned. The actuators may be automated to adjust the position of each side member when there is a surface obstacle to be overcome, such as a window frame or window ledge. For example, the side members may extend over an obstacle such as a window frame, and as the side members extend over the obstacle, they push the cleaning device away from the surface to be cleaned. The arms may remain extended outward to allow the equipment to move across the surface or until the device is guided around the obstacle. The actuators may be automated using sensors similar to those used in car wash systems. Alternatively, the actuators may be controlled by an operator using a remote control or push buttons. In one embodiment, the actuators may control the position of the left side member independently of the right side member, or vice versa. It should be appreciated that the side members have a number of intermediate positions between being fully extended outwardly from the carriage and being retracted inwardly towards a complementary cavity in which the side members can be received.

[0043] This embodiment may further comprise two pairs of motorized ducted fan units 113, 114 arranged around each end of the shaft 104. Each pair of fans together provide a forward thrust on the carriage towards the rotating brushes of at least 5kg, preferably 8kg, more preferably 10kg in use. The overall weight of the cleaning device is preferably around 100kg. The ducted fan units are EDF JETFAN-120 eco Ejets + HET 800-68-830 fans, available from https: / / www.turbines-rc.com. These motorized ducted fans provide significant stability to the cleaning device, allowing it to be operated and moved over structures or surfaces at relatively high speeds. In a preferred embodiment, the fans use low voltage (approximately 24-48V) brushless DC motors.

[0044] In use, a winch 111 attached to the cleaning apparatus may move the apparatus up and down relative to a building surface (not shown). The winch 111 in this embodiment is supported or attached to the cleaning apparatus, allowing the cleaning apparatus to raise and lower itself up and down any surface. In this embodiment, the cleaning apparatus also includes a power box 115 (shown in FIG. 21) that provides independent power to the winch.

[0045] The winch is preferably self-winding, has a long rope or cable, and has variable speed control. The winch may be connected to a support system, preferably a rooftop support system (not shown). It is understood that the rooftop system may be integrated into the building infrastructure or may be a portable lifting or rigging frame installed for the cleaning operation. In this manner, the winch system may be used to control and support the vertical and lateral movement of the cleaning apparatus 101 across the surface to be cleaned.

[0046] In this embodiment, the winch 111 is mounted to a carriage or framework 102 adjacent the rear of the cleaning apparatus. It is understood that the winch may be mounted elsewhere on the cleaning apparatus. A pulley 120 is attached to the framework 102. In use, a hanging member (not shown), such as a rope, may be extended from the winch 111 through the pulley 120 to the rooftop. The winch 111 is operable through an access port 116. The access port 116 is hinged by a number of hinges 118 to allow it to be opened and closed. The access port 116 opens upward toward the pulley and closes downward away from the pulley. The access port 116 includes an opening 119 that allows the pulley 120 to extend from the access port when the access port is in an open position. The cleaning apparatus 101 may include a lifting tab 121 to which a support member (not shown), such as a cable or rope from a portable rigging system, may be attached.

[0047] Typically, most window cleaning is performed with or in conjunction with the application of fluids, particularly water, and therefore the cleaning devices described above require a fluid delivery system. Spray cleaning systems, brush cleaning systems, roller applicators / scrubbing systems, fabric applicators, rag applicators, and combinations thereof all use water to facilitate removal of surface dirt and to minimize friction between any physical element and the surface being cleaned, reducing wear and scratching. The fluid can be water, treated water (e.g., demineralized water, deionized water, chemically treated water), or otherwise water-based (surfactants, amphiphilic substances that remain with the water but dissolve or soften hydrophobic and oleophilic substances), and other common cleaning fluids (ammonia, vinegar, etc.). In a preferred embodiment, a hose (not shown) connects to the carriage and delivers water through a series of spaced spray heads or nozzles 126 positioned along the top frame of the carriage above the cleaning elements as best shown in FIG. 20, which spray water onto the rotating brush and the surface being cleaned. The hose is connected to the cleaning device by a quick release (push on and lock) connection, although other connections are contemplated, such as a threaded hose connection. The hose can be connected at the ground to a pump (electric or fuel-powered) used to pump the water, or the hose can be connected from the top of the structure to be cleaned. Alternatively, a water pump or water blaster can be used to push the water through the nozzle or spray head of the cleaning device. It should be appreciated that there are many ways to apply the liquid to the surface to be cleaned. The applicator can be a spray device, a jet spray, a squirt spray, a roller brush, a reciprocating fabric sheet, water and air jets, a squeegee system, and the like, as will be well understood by those skilled in the art. It is preferable to be able to adequately apply the liquid without the need for a large pressure system.

[0048] Additionally, the carriage or framework 102 is adapted and configured to provide strength and shape to the cleaning apparatus. The framework is preferably configured in a honeycomb lattice pattern to minimize weight. It should be understood that the carriage 102 can be configured in a variety of ways to support the framework and components of the cleaning apparatus, and the illustrated embodiment is only one way the framework 102 may be configured.

[0049] The present invention and its embodiments have been described in detail above. However, the scope of the present invention is not limited to the specific embodiments of the present invention described herein. Various modifications, substitutions, and variations can be made to the disclosed components without departing from the intent and / or essential features of the present invention. Therefore, those skilled in the art should easily understand from this disclosure that subsequent modifications, substitutions, and / or variations that perform substantially the same function or achieve substantially the same results as the embodiments described herein can be applied according to the related embodiments of the present invention. Therefore, the appended claims are intended to include within their scope the modifications, substitutions, and variations to the embodiments of the present invention disclosed herein.

Claims

1. A unmanned cleaning device suitable for cleaning the surface of a structure, a carriage configured to move vertically with respect to the surface of the structure, a cleaning element attached to the carriage and configured to rotate substantially around a horizontal axis during use, the cleaning element being configured to contact the surface, at least one pair of support members attached to the carriage and supporting the unmanned cleaning device with respect to the surface, at least one pair of electric ducted fans, each pair of the electric ducted fans being arranged at each end of the carriage, respectively, and the pair of electric ducted fans together providing a pressing force to the carriage in a direction towards the surface to be cleaned during use, and stabilizing the unmanned cleaning device with respect to the surface to be cleaned, a remotely operable motor configured to rotate the cleaning element around its horizontal axis crossing the surface to be cleaned during use, a spray boom attached to the carriage and provided with a plurality of spaced nozzles configured to spray water towards the cleaning element and the surface of the structure to be cleaned during use A unmanned cleaning device comprising.

2. Further comprising at least one suspension member disposed adjacent to the upper surface of the carriage, the suspension member being configured to be connected to a winch rope during use, the winch rope connecting the unmanned cleaning device to a winch configured to move the carriage upward or downward as needed during use. The unmanned cleaning device according to claim 1.

3. Each pair of the support members comprises a pair of wheels attached to the carriage. The unmanned cleaning device according to claim 1 or claim 2.

4. The unmanned cleaning device according to claim 3, comprising two pairs of wheels attached to the carriage. **Claim 5**: The unmanned cleaning device according to claim 4, wherein the wheels are attached near each corner of the carriage. **Claim 6** The unmanned cleaning device according to any one of claims 1 to 5, comprising two pairs of electric ducted fans, with one electric ducted fan of each pair being arranged at each end of the carriage. **Claim 7**: The unmanned cleaning device according to claim 6, wherein each of the electric ducted fans at each end of the carriage is arranged spaced apart from the adjacent fan at the same end around the horizontal axis of the cleaning element. **Claim 8** The unmanned cleaning device according to any one of claims 1 to 7, wherein the electric ducted fan is battery-driven and operable independently of any external power source. **Claim 9**: The unmanned cleaning device according to any one of claims 1 to 8, wherein each pair of electric ducted fans together provides a combined pressing force of at least 5% of the weight of the unmanned cleaning device. **Claim 10**: The unmanned cleaning device according to claim 9, wherein each pair of electric ducted fans provides a combined pressing force of at least 10% of the weight of the unmanned cleaning device. **Claim 11** The unmanned cleaning device according to any one of claims 1 to 10, wherein the cleaning element is a rotatable brush. **Claim 12** The unmanned cleaning device according to any one of claims 1 to 11, comprising a battery-driven motor for driving the cleaning element independently of any external power source. **Claim 13**: The unmanned cleaning device according to any one of claims 1 to 12, wherein each electric ducted fan is driven by a direct current (DC) motor. **Claim 14**: The unmanned cleaning device according to any one of claims 1 to 13, wherein the position of each support member is adjustable in the front-rear direction with respect to the cleaning element and the surface to be cleaned.

15. The unmanned cleaning device according to claim 14, wherein each of the support members is attached to an adjustable depth track and configured to enable the front-to-back movement of each wheel with respect to the cleaning element.

16. The unmanned cleaning device according to any one of claims 1 to 15, further comprising at least one pair of lateral members configured and adapted to support the movement of the carriage across the surface of the structure during use.

17. The unmanned cleaning device according to claim 16, wherein each of the lateral members comprises a swing arm extending outward from the carriage.

18. The unmanned cleaning device according to claim 16 or claim 17, wherein each of the swing arms comprises an auxiliary movement member at its distal end.

19. The unmanned cleaning device according to any one of claims 16 to 18, wherein the unmanned cleaning device comprises at least two pairs of lateral members.

20. A cleaning system comprising the unmanned cleaning device according to any one of claims 1 to 19, and a portable winch member configured to raise and lower the unmanned cleaning device vertically on the surface to be cleaned during use and disposed on a surface above the surface to be cleaned by the unmanned cleaning device during use.

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