Sign cleaning assembly

Abstract

Provided is a sign cleaning assembly 10 comprising a peripheral framework 18 defining a passage 30 therethrough and configured for operative mounting to a vehicle 12. Assembly 10 also includes two rotary brushes 22 mounted within the framework 18 and transversely across said passage 20, at least one rotary brush slidably mounted within the framework 18 so that a distance separation between said brushes 22 is adjustable by sliding the brush towards or away from the other brush. Also included is an actuator 24 for actuating said rotary brushes 22, the actuator 24 configured selectively to be energised by a power take-off (PTO) 16 of the vehicle 12. In this manner, a sign 8 is passable through the passage 20 and the brushes 22 actuatable and adjustable for cleaning opposite sides of the sign 8 simultaneously.

Description

SIGN CLEANING ASSEMBLYTECHNICAL FIELD

[0001] This invention broadly relates to industrial cleaning equipment, and more particularly to a sign cleaning assembly and an associated vehicle comprising a sign cleaning assembly.BACKGROUND ART

[0002] The following discussion of the background art is intended to facilitate an understanding of the present invention only. The discussion is not an acknowledgement or admission that any of the material referred to is or was part of the common general knowledge as at the priority date of the application.

[0003] On industrial sites, such as mining and construction sites, various road and infrastructure demarcation signs and posts are generally used. Such signs may take various forms, such as road traffic signs, safety signs, information signs, and / or the like. Such signs are often of high importance by indicating and providing information on safety practices, operational practices, and / or the like.

[0004] However, as a result of the inherent nature of such industrial sites, such as a mine site, it is not uncommon for dirt and dust to be generated that adhere to signage and impede visibility of information thereon. Accordingly, it is not uncommon for signage on an industrial site to require periodic cleaning.

[0005] Conventionally, cleaning of industrial signage is typically performed manually, where personnel clean or wash signs with buckets of water, cloths and brushes, or the like. On many industrial sites, such manual cleaning is arduous and timeconsuming, especially if there is a large amount of signage and / orthe industrial site spans a large geographical area. For example, mine sites may span several square kilometers and include hundreds or even thousands of signs, making conventional cleaning practices time-consuming and arduous.

[0006] In light hereof, Applicant has identified a need in the art for a sign cleaning assembly that is able to clean signage on industrial sites in an efficient and automated manner and the current invention was conceived with these goals in mind.SUMMARY OF THE INVENTION

[0007] The skilled addressee is to appreciate that reference herein to a 'sign' is made in a broad and non-exclusive manner and may include reference to any sign or related indicium having a purpose of imparting information, including safety signs, road traffic signs, commercial signs, demarcation posts, etc. Accordingly, reference herein to a sign comprises reference to any signage or related indicium that may be installed and / or used at an industrial or work site, such as freestanding signs, road cones, sign posts, demarcation signs, etc.

[0008] Additionally, reference herein to a 'power take-off' or 'PTO' comprises broad reference to various methods for taking power from a power source, such as a running engine, and transmitting it to an application, such as an attached implement or separate machine, including an electrical power take-off, a mechanical power take-off, a hydraulic power take-off, a pneumatic power takeoff, and the like.

[0009] According to a first aspect of the invention there is provided a sign cleaning assembly comprising: a peripheral framework defining a passage therethrough and configured for operative mounting to a vehicle;two rotary brushes mounted within the framework and transversely across said passage, at least one rotary brush slidably mounted within the framework so that a distance separation between said brushes is adjustable by sliding the brush towards or away from the other brush; and an actuator for actuating said rotary brushes, the actuator configured selectively to be energised by a power take-off (PTO) of the vehicle, wherein a sign is passable through the passage and the brushes actuatable and adjustable for cleaning opposite sides of the sign simultaneously .

[0010] In an embodiment, the peripheral framework comprises four beams arranged in a quadrangle, the rotary brushes mounted adjacent each other between opposed beams.

[0011] In an embodiment, the framework is configured for mounting to a manipulable arm or boom of the vehicle by means of suitable mechanical mountings.

[0012] In an embodiment, the rotary brushes are mounted within the framework by means of suitable bearings.

[0013] In an embodiment, the framework defines opposed slots for receiving ends of the at least one rotary brush therein so that said rotary brush is selectively slidable towards or away from the other brush.

[0014] In an embodiment, the actuator comprises an electromechanical, hydraulic or pneumatic actuator configured to rotate or slidably adjust the at least one rotary brush, the actuator energised by an electrical, hydraulic or pneumatic power take-off, respectively, of the vehicle.

[0015] In an embodiment, the actuator comprises a clutch to allow decoupling of the brushes from the actuator.

[0016] In an embodiment, the actuator is configured to actuate the rotary brushes to turn in opposite directions to facilitate cleaning the sign within the passage.

[0017] In an embodiment, the actuator comprises a linear displacer, such as a hydraulic or pneumatic piston and cylinder arrangement, to adjust the distance separation between the rotary brushes .

[0018] In an embodiment, the sign cleaning assembly comprises a force sensor configured to sense a force applied from a rotary brush onto the sign, the cleaning assembly configured to regulate the linear displacer and / or rotary brushes to prevent damage to the sign and ensure the brushes contact the sign.

[0019] In an embodiment, the sign cleaning assembly comprises a cleaning fluid applicator arrangement comprising a cleaning fluid reservoir and pump arranged in fluid communication with at least one fluid nozzle arranged proximate the rotary brushes.

[0020] In an embodiment, the cleaning fluid applicator arrangement is selectively energised from the power take-off (PTO) of the vehicle.

[0021] According to a second aspect of the invention there is provided a vehicle having a power take-off (PTO) and comprising a sign cleaning assembly mounted to a manipulable arm or boom of said vehicle, the sign cleaning assembly comprising: a peripheral framework defining a passage therethrough; two rotary brushes mounted within the framework and transversely across said passage, at least one rotary brushslidably mounted within the framework so that a distance separation between said brushes is adjustable by sliding the brush towards or away from the other brush; and an actuator for actuating said rotary brushes, the actuator configured selectively to be energised by the power take-off (PTO) , wherein the manipulable arm or boom is useable to pass the peripheral framework over a sign to pass through the passage and the brushes actuatable and adjustable for cleaning opposite sides of the sign simultaneously.

[0022] In an embodiment, the peripheral framework comprises four beams arranged in a quadrangle, the rotary brushes mounted adjacent each other between opposed beams.

[0023] In an embodiment, the rotary brushes are mounted within the framework by means of suitable bearings.

[0024] In an embodiment, the framework defines opposed slots for receiving ends of the at least one rotary brush therein so that said rotary brush is selectively slidable towards or away from the other brush.

[0025] In an embodiment, the actuator comprises an electromechanical, hydraulic or pneumatic actuator configured to rotate or slidably adjust the at least one rotary brush, the actuator energised by an electrical, hydraulic or pneumatic power take-off, respectively, of the vehicle.

[0026] In an embodiment, the actuator is configured to be controlled from a cabin of the vehicle.

[0027] In an embodiment, the actuator comprises a clutch to allow decoupling of the brushes from the actuator.

[0028] In an embodiment, the actuator is configured to actuate the rotary brushes to turn in opposite directions to facilitate cleaning the sign within the passage.

[0029] In an embodiment, the actuator comprises a linear displacer, such as a hydraulic or pneumatic piston and cylinder arrangement, to adjust the distance separation between the rotary brushes .

[0030] In an embodiment, the sign cleaning assembly comprises a force sensor configured to sense a force applied from a rotary brush onto the sign, the cleaning assembly configured to regulate the linear displacer and / or rotary brushes to prevent damage to the sign and ensure the brushes contact the sign.

[0031] In an embodiment, the sign cleaning assembly comprises a cleaning fluid applicator arrangement comprising a cleaning fluid reservoir and pump arranged in fluid communication with at least one fluid nozzle arranged proximate the rotary brushes.

[0032] In an embodiment, the cleaning fluid applicator arrangement is selectively energised from the power take-off (PTO) of the vehicle.

[0033] In an embodiment, the cleaning fluid applicator arrangement is mounted to the vehicle.

[0034] According to a third aspect of the invention there is provided a method for cleaning a sign by means of the sign cleaning assembly in accordance with the first aspect of the invention above, said method comprising using a manipulable arm or boom to pass the peripheral framework over a sign to pass through the passage and actuating and / or adjusting the brushes to clean opposite sides of the sign simultaneously.

[0035] According to a further aspect of the invention there is provided a sign cleaning assembly and an associated vehicle comprising a sign cleaning assembly, substantially as herein described and / or illustrated .BRIEF DESCRIPTION OF THE DRAWINGSThe description will be made with reference to the accompanying drawings in which :Figure 1 is a diagrammatic perspective-view representation of one embodiment of a sign cleaning assembly mounted to a manipulable arm or boom of a vehicle , in accordance with aspects of the invention;Figure 2 is a diagrammatic front perspective-view representation of the sign cleaning assembly of Figure 1 ;Figure 3 is diagrammatic rear perspective-view representation of the sign cleaning assembly of Figure 1 ;Figure 4 is a diagrammatic side-sectional representation of the sign cleaning assembly of Figure 1 , showing the peripheral framework being passed over a sign;Figure 5 is a diagrammatic side-sectional representation of the sign cleaning assembly of Figure 4 , showing a sign passed via the passage of the peripheral framework and cleaning by the rotary brushes and cleaning fluid applicator arrangement ;Figure 6 is a diagrammatic side-sectional representation of the sign cleaning assembly of Figure 1 , showing the two rotary brushes slidably adj usted to accommodate a thicker sign ; andFigure 7 is a diagrammatic side-sectional representation of the sign cleaning assembly of Figure 6, showing the two rotary brushes slidably adj usted to accommodate a thinner sign .DETAILED DESCRIPTION OF EMBODIMENTS

[0036] Further features of the present invention are more fully described in the following description of several non-limiting embodiments thereof . This description is included solely for the purposes of exempli fying the present invention to the skilled addressee . It should not be understood as a restriction on the broad summary, disclosure or description of the invention as set out above .

[0037] In the figures , incorporated to illustrate features of the example embodiment or embodiments , like reference numerals are used to identi fy like parts throughout . Additionally, features , mechanisms and aspects well-known and understood in the art will not be described in detail , as such features , mechanisms and aspects will be within the understanding of the skilled addressee .

[0038] Additionally, the accompanying figures do not represent engineering or design drawings , but provide a functional overview of the invention only . As a result , features and practical construction details required for various embodiments may not be indicated in each figure , but such construction requirements will be within the understanding of the skilled addressee .

[0039] With reference now to the accompanying figures , there is exempli fied on possible embodiment of a vehicle 12 having a power take-of f ( PTO) 16 and which and comprising a sign cleaning assembly 10 typically mounted to a manipulable arm or boom 14 of the vehicle 14 , as shown . In the exempli fied embodiment , the vehicle 12 comprises a skid-steer loader, but the skilled addressee is toappreciate that other embodiments may comprise other types and styles of vehicles , such as a telehandler, an excavator, a frontend loader, a backhoe , a forkli ft , a compact track loader, and / or any other utility vehicle or industrial machines that may include or be fitted with a manipulable arm or boom 14 , or the like . Such variations are expected and anticipated .

[0040] Accordingly, depending on the type or style of vehicle 12 , a suitable power take-of f 16 may also take a variety of forms , including an electrical connection for supplying electrical power to an electromechanical actuator, a hydraulic power take-of f for supplying a hydraulic actuator, a pneumatic power take-of f for supplying a pneumatic power take-of f , a mechanical power take-of f for supplying a mechanical actuator, or the like .

[0041] The sign cleaning assembly 10 broadly comprises a peripheral framework 18 which defines a passage 20 for a sign therethrough, as well as two rotary brushes 22 mounted within the framework 18 and transversely across said passage 20 , as shown . In the exempli fied embodiment , the peripheral framework 18 comprises four beams 26 arranged in a quadrangle , with the rotary brushes 22 mounted adj acent each other between opposed beams . Typically, the rotary brushes 22 are mounted within the framework 18 by means of suitable bearings 28 .

[0042] Of course , variations on the structure and layout of the peripheral framework 18 are possible . For example , one embodiment may have the framework 18 comprised of three beams 26 arranged in a U-shaped manner with the rotary brushes 22 mounted between legs of the resulting U-shaped framework, i . e . a quadrangle with one open side . Other variations are also possible and expected, and may provide substantial mechanical equivalence without departing from the scope of the present invention .

[0043] At least one of the rotary brushes 22 is typically slidably mounted within the framework 18 so that a distance separation between the two roller brushes 22 is adjustable by sliding the one brush towards or away from the other brush. In one embodiment, the framework 18 defines opposed slots 30 for receiving ends of the at least one rotary brush 22 therein so that said rotary brush is selectively slidable towards or away from the other brush. Again, variations hereon are possible and expected.

[0044] The sign cleaning assembly 10 further includes an actuator 24 for actuating the rotary brushes 22, by rotating or turning as well as sliding the at least one slidable brush, the actuator 24 generally configured selectively to be energised by the power take-off (PTO) 16. In one embodiment, the actuator 24 comprises a linear displacer, such as a hydraulic or pneumatic piston and cylinder arrangement, or the like, to adjust the distance separation between the rotary brushes 22.

[0045] In one embodiment, typically dependent on the style or type of vehicle and available power take-off 16, the actuator 24 may comprise an electromechanical, hydraulic or pneumatic actuator configured to rotate both brushes 22 and / or slidably adjust the at least one slidable rotary brush, the actuator 24 in turn energised by an electrical, hydraulic or pneumatic power take-off, respectively, of the vehicle 12. In the exemplified embodiment, the actuator 24 comprises a hydraulic actuator that is arrangeable in hydraulic fluid communication with a hydraulic power take-off of the vehicle 12. In a typical embodiment, the actuator 24 is configured to be controlled from a cabin of the vehicle 12.

[0046] In one embodiment, the actuator 24 may comprise a clutch (not shown) to allow decoupling of the brushes 22 from the actuator 24. In one embodiment, the actuator 24 is configured to actuatethe rotary brushes 22 to turn or rotate in opposite directions to facilitate cleaning the sign 8 within the passage 20 .

[0047] In this manner, as shown in figures 4 to 7 , the manipulable arm or boom 14 of the vehicle 12 is useable to pass the peripheral framework 18 over a sign 8 to pass through the passage 20 and the brushes 22 actuatable and adj ustable , a required, for cleaning opposite sides of the sign 8 simultaneously . The peripheral framework 18 is lowered or raised over the sign 8 , with the at least one slidable brush adj usted so that the rotary brushes 22 are in contact with either side of the sign 8 , respectively .

[0048] In one embodiment , the sign cleaning assembly 10 may comprise a force sensor 32 , such as a pressure transducer, a strain gauge , or the li ke , which is configured to sense a force applied from a rotary brush 22 onto the sign 8 . The cleaning assembly 10 may further be configured to regulate the linear displacer responsible for adj usting a distance separation between the two roller brushes 22 and / or the rotary brushes 22 in order to prevent damage to the sign whilst ensuring that the brushes contact the sign to facilitate cleaning .

[0049] In one embodiment , the sign cleaning assembly 10 further comprises a cleaning fluid applicator arrangement 34 which generally compri ses a cleaning fluid reservoir 36 and pump 38 arranged in fluid communication with at least one fluid noz zle 40 that is arranged proximate the rotary brushes 22 , as shown . In one embodiment , the cleaning fluid applicator arrangement 34 is selectively energised from the power take-of f ( PTO) 16 of the vehicle 12 , typically also controlled from a cabin of the vehicle 12 . In a typical embodiment , the cleaning fluid applicator arrangement 34 i s mounted to the vehicle 12 . In this manner, the cleaning fluid applicator arrangement 34 can discharge a cleaningfluid, such as a water and soap solution, onto the rotary brushes and / or sign 8 in order to facilitate cleaning . The exempli fied embodiment shows the cleaning fluid reservoir 36 mounted to a roof of the vehicle 12 , but our course variations hereon are possible and expected .

[0050] The skilled addressee is further to appreciate that the present invention includes and associated method for cleaning a sign 8 by means of the sign cleaning assembly 10 . Such a method broadly comprises the steps of using a manipulable arm or boom 14 of a vehicle 12 to which the cleaning assembly 10 is mounted to pass the peripheral framework 18 over a sign 8 to pass through the passage 20 and actuating and / or adj usting the brushes 22 to clean opposite sides of the sign simultaneously .

[0051] Applicant believes it particularly advantageous that the present invention provides for a sign cleaning assembly 10 and an associated vehicle 12 including such a sign cleaning assembly 10 whereby signage on industrial sites can be cleaned in an ef ficient and automated manner .

[0052] In the example embodiments , well-known processes , well- known device structures , and well-known technologies are not described in detail , as such will be readily understood by the skilled addressee . Optional embodiments of the present invention may also be said to broadly consist in the parts , elements and features referred to or indicated herein, individually or collectively, in any or all combinations of two or more of the parts , elements or features . Where speci fic integers are mentioned herein which have known equivalents in the art to which the invention relates , such known equivalents are deemed to be incorporated herein as i f individually set forth .

[0053] It is to be appreciated that reference to "one example" or "an example" of the invention, or similar exemplary language (e.g., "such as") herein, is not made in an exclusive sense. Various substantially and specifically practical and useful exemplary embodiments of the claimed subject matter are described herein, textually and / or graphically, for carrying out the claimed subject matter. Accordingly, one example may exemplify certain aspects of the invention, whilst other aspects are exemplified in a different example. These examples are intended to assist the skilled person in performing the invention and are not intended to limit the overall scope of the invention in any way unless the context clearly indicates otherwise.

[0054] Variations (e.g. modifications and / or enhancements) of one or more embodiments described herein might become apparent to those of ordinary skill in the art upon reading this application. The inventor (s) expects skilled artisans to employ such variations as appropriate, and the inventor (s) intends for the claimed subject matter to be practiced other than as specifically described herein.

[0055] The use of the terms "a", "an", "said", "the", and / or similar referents in the context of describing various embodiments (especially in the context of the claimed subject matter) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The terms "comprising, " "having, " "including, " and "containing" are to be construed as open-ended terms (i.e., meaning "including, but not limited to,") unless otherwise noted. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. No language in the specification should be construed as indicating any non-claimed subject matter as essential to the practice of the claimed subject matter.

[0056] Spatially relative terms, such as "inner, " "outer, " "beneath, " "below, " "lower, " "above, " "upper, " and the like, may be used herein for ease of description to describe one element or feature's relationship to another element (s) or feature (s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the contrivance in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The contrivance may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly .

[0057] Any method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed .

Claims

CLAIMS1 . A sign cleaning assembly comprising : a peripheral framework defining a passage therethrough and configured for operative mounting to a vehicle ; two rotary brushes mounted within the framework and transversely across said passage , at least one rotary brush slidably mounted within the framework so that a distance separation between said brushes is adj ustable by sliding the brush towards or away from the other brush; and an actuator for actuating said rotary brushes , the actuator configured selectively to be energised by a power take-of f ( PTO) of the vehicle , wherein a sign is passable through the passage and the brushes actuatable and adj ustable for cleaning opposite sides of the sign simultaneously .2 . The sign cleaning assembly of claim 1 , wherein the peripheral framework comprises four beams arranged in a quadrangle , the rotary brushes mounted adj acent each other between opposed beams .3 . The sign cleaning assembly of either of claims 1 or 2 , wherein the framework is configured for mounting to a manipulable arm or boom of the vehicle by means of suitable mechanical mountings .4 . The sign cleaning assembly of any of claims 1 to 3 , wherein the rotary brushes are mounted within the framework by means of suitable bearings .5 . The sign cleaning assembly of any of claims 1 to 4 , wherein the framework defines opposed slots for receiving ends of the at least one rotary brush therein so that said rotary brush is selectively slidable towards or away from the other brush .6 . The sign cleaning assembly of any of claims 1 to 5 , wherein the actuator comprises an electromechanical , hydraulic or pneumatic actuator configured to rotate and / or slidably adj ust the at least one rotary brush, the actuator energised by an electrical , hydraulic or pneumatic power take-of f , respectively, of the vehicle .7 . The sign cleaning assembly of any of claims 1 to 6 , wherein the actuator comprises a clutch to allow decoupling of the brushes from the actuator .8 . The sign cleaning assembly of any of claims 1 to 7 , wherein the actuator is configured to actuate the rotary brushes to turn in opposite directions to facilitate cleaning the sign within the passage .9 . The sign cleaning assembly of any of claims 1 to 8 , wherein the actuator comprises a linear displacer, such as a hydraulic or pneumatic piston and cylinder arrangement , to adj ust the distance separation between the rotary brushes .10 . The sign cleaning assembly of any of claims 1 to 9 , which comprises a force sensor configured to sense a force applied from a rotary brush onto the sign, the cleaning assembly configured to regulate the linear displacer and / or rotary brushes to prevent damage to the sign and ensure the brushes contact the sign .11 . The sign cleaning assembly of any of claims 1 to 10 , which comprises a cleaning fluid applicator arrangement comprising a cleaning fluid reservoir and pump arranged in fluid communication with at least one fluid noz zle arranged proximate the rotary brushes .12 . The sign cleaning assembly of any of claims 1 to 11 , wherein the cleaning fluid applicator arrangement is selectively energised from the power take-of f ( PTO) of the vehicle .13 . A vehicle having a power take-of f ( PTO) and comprising a sign cleaning assembly mounted to a manipulable arm or boom of said vehicle , the sign cleaning assembly comprising : a peripheral framework defining a passage therethrough ; two rotary brushes mounted within the framework and transversely across said passage , at least one rotary brush slidably mounted within the framework so that a distance separation between said brushes is adj ustable by sliding the brush towards or away from the other brush; and an actuator for actuating said rotary brushes , the actuator configured selectively to be energised by the power take-of f ( PTO) , wherein the manipulable arm or boom is useable to pass the peripheral framework over a sign to pass through the passage and the brushes actuatable and adj ustable for cleaning opposite sides of the sign simultaneously .14 . The vehicle of claim 13 , wherein the peripheral framework comprises four beams arranged in a quadrangle , the rotary brushes mounted adj acent each other between opposed beams .15 . The vehicle of either of claims 13 or 14 , wherein the rotary brushes are mounted within the framework by means of suitable bearings .16 . The vehicle of any of claims 13 to 15 , wherein the framework defines opposed slots for receiving ends of the at least one rotary brush therein so that said rotary brush is selectively slidable towards or away from the other brush .17 . The vehicle of any of claims 13 to 16 , wherein the actuator comprises an electromechanical , hydraulic or pneumatic actuator configured to rotate and / or slidably adj ust the at least one rotary brush, the actuator energised by an electrical , hydraulic or pneumatic power take-of f , respectively, of the vehicle .18 . The vehicle of any of claims 13 to 17 , wherein the actuator is configured to be controlled from a cabin of the vehicle .19 . The vehicle of any of claims 13 to 18 , wherein the actuator comprises a clutch to allow decoupling of the brushes from the actuator .20 . The vehicle of any of claims 13 to 19 , wherein the actuator is configured to actuate the rotary brushes to turn in opposite directions to facilitate cleaning the sign within the passage .21 . The vehicle of any of claims 13 to 20 , wherein the actuator comprises a linear displacer, such as a hydraulic or pneumatic piston and cylinder arrangement , to adj ust the distance separation between the rotary brushes .22 . The vehicle of any of claims 13 to 21 , wherein the sign cleaning assembly comprises a force sensor configured to sense a force applied from a rotary brush onto the sign, the cleaning assembly configured to regulate the linear displacer and / or rotary brushes to prevent damage to the sign and ensure the brushes contact the sign .23 . The vehicle of any of claims 13 to 22 , wherein the sign cleaning assembly comprises a cleaning fluid applicator arrangement comprising a cleaning fluid reservoir and pump arranged in fluid communication with at least one fluid noz zle arranged proximate the rotary brushes .24 . The vehicle of any of claims 13 to 23 , wherein the cleaning fluid applicator arrangement is selectively energised from the power take-of f ( PTO) of the vehicle .25 . The vehicle of any of claims 13 to 24 , wherein the cleaning fluid applicator arrangement is mounted to the vehicle .26 . A method for cleaning a sign by means of the sign cleaning assembly in accordance with any of claims 1 to 12 , said method comprising using a manipulable arm or boom to pass the peripheral framework over a sign to pass through the passage and actuating and / or adj usting the brushes to clean opposite sides of the sign simultaneously .

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