System and method for facilitating use of a cleaning tool on an extension pole

Abstract

A system (10) and method for facilitating use of cleaning equipment (20) with a cleaning tool (21) attached to the distal end (22d) of an extension pole (22) for cleaning a surface (S) at elevated height (Z). A harness (11) worn on an operator's torso (T) includes a carrying arm (12), which is preferably attached on to the back side (B) of the harness (11), and extending around for providing at least one attachment position (A) in front of the operator's torso (T), preferably in front of the chest. An elastic tether (14) is connected between the attachment position (A) of the carrying arm (12) and a proximal end (22p) of the extension pole (22) for at least partially supporting a weight (W) of the cleaning tool (21) and extension pole (22) via elastic tether (14), the carrying arm (12), and the harness (11) on the operator's torso (T).

Description

TECHNICAL FIELD AND BACKGROUND

[0001] The present invention relates to systems and methods to facilitate the use of cleaning equipment for an operator, in particular for cleaning surfaces at elevated heights.

[0002] Cleaning surfaces at elevated heights, such as windows on tall buildings, poses significant challenges to operators of cleaning equipment. At low to medium heights, ladders may be used. However, these presents inherent safety risks due to potential falls and the difficulty of maintaining stability while working. For more extensive or higher elevation work, aerial work platforms may be employed. However, these may come with their own set of challenges including high rental costs, limited maneuverability in tight spaces, and the need for specialized training to operate safely. By attaching the cleaning tool at the end of an extension pole, operators can reach elevated surfaces while remaining at ground level or on a lower, more stable platform. This approach increases safety by reducing the need for ladders or aerial platforms in many situations, improves efficiency by allowing a larger area to be cleaned from a single position, and can be more cost-effective than renting specialized equipment. However, such cleaning equipment may be heavy and difficult to maneuver, leading to fatigue and potential safety risks.

[0003] To alleviate physical strain and improve control of the cleaning equipment, the present inventor has previously disclosed in NL2013748B1 a method and apparatus for handling a tool on an extension pole supported using a harness worn around the operator's torso. The harness includes a tube that starts by extending primarily vertically upward from the operator's back. This tube then curves sharply, forming an arch that extends above and beyond the operator's head. The tube terminates at an end point positioned above the operator's head. At this elevated end point, a suspension device is attached. This device incorporates a cord, cable, or rope that hangs down in front of the operator, with an attachment means for the tool at its lower end. The tool itself is attached to the far end of an elongated extendable pole, which is supported by the attachment means near its opposite end. This overhead configuration, with the support point located above the operator's head, aims to provide a mechanical advantage for lifting and maneuvering the cleaning tool.

[0004] While the known harness with overhead pole configuration provides notable advantages in operating a cleaning tool on an extension pole, there remains a need to further improve tool support and weight distribution, in particular to facilitate a more natural posture and motion of the operator.SUMMARY

[0005] Aspects of the present invention can be embodied as systems and methods for facilitating use of cleaning equipment by an operator. The cleaning equipment comprises a cleaning tool, such as a brush and / or squeegee, attached at the distal end of an extension pole. The cleaning tool, operated via the extension pole, may be used for cleaning a surface, such as a window or wall, at elevated heights. A harness is configured to be worn on the operator's torso. A carrying arm is configured to be attached to the harness for providing at least one attachment position on a portion of the carrying arm in front of the operator's torso. A tether is connectible between the at least one attachment position on the carrying arm and the proximal end of the extension pole. Accordingly, a substantial part of the weight of the cleaning tool and extension pole may be supported via the carrying arm and the harness on the operator's torso.

[0006] According to the invention, an elastic tether is attached to the carrying arm at an attachment position arranged in front of the operator's torso, preferably at a small distance in front of the chest. The inventor surprising finds that such relatively low, front-mounted attachment point allows for a more natural back-and-forth movement when operating the cleaning equipment, in particular when the cleaning equipment is supported via the elastic tether, e.g. comprising an elastic material and / or spring. Without being bound by theory, advantages of the invention may be attributed to an advantageous combination of factors. The position of the attachment point, close and in front of the operator's torso, in particular the chest, may create a favorable support position close to the center or core of the operator's body. Due to the relatively short length of the elastic cord (compared to an overhead configuration), a more responsive and controllable support mechanism may be provided. The elastic or spring constant of the cord, combined with the lower mounting point, may result in a balance of forces that feels more intuitive and less strenuous for the operator, in particular when operating the tool in an elastically supported back and forth cleaning motion. While performing this motion, the operator may take particular advantage of a natural frequency of the system. For example, the natural frequency, may be relatively high due to the shorter cord length and / or possibly increased elastic / spring constant, to align more closely with a natural rhythm of human arm movements during cleaning tasks. This may create an elastically supported resonance effect, making the cleaning motion feel more effortless and allowing for faster, more controlled movements. This synergy between the system's mechanics and human biomechanics may thus contribute to reduced fatigue and increased efficiency, especially during extended cleaning sessions at elevated heights.

[0007] Advantageously, the carrying arm may be attached to the harness on a back side of the operator's torso, extending from the back side around the operator's torso for providing the at least one attachment position in front of the operator's torso. The back-mounted design of the carrying arm may effectively distribute the load across the operator's back and shoulders, which can reduce strain and improve balance during cleaning operations. This ergonomic weight distribution may further alleviate fatigue during extended use. As described herein, the back mounting may allow the carrying arm to extend around the operator's torso, e.g. around one of the shoulders and preferably below eye height, without substantially restricting arm movement or vision, offering support while maintaining freedom of motion and overview of the environment. This configuration may thus enhance the stability and control of cleaning motions, particularly when combined with the front attachment point and elastic tether.

[0008] Advantageously, the elastic tether may resiliently support a reciprocating motion of the operator using the cleaning equipment. Typically, this reciprocating motion may be predominantly vertical, while also incorporating a horizontal component depending on the angle of the extension pole relative to the surface being cleaned. This resilient support can facilitate an efficient cleaning motion, potentially reducing operator fatigue and enhancing overall productivity. The tether's capacity for significant stretching during the reciprocating motion can provide an extensive range of movement, enabling the operator to employ large strokes to clean a substantial area without frequent positional adjustments.

[0009] By engineering the elastic properties to provide a natural frequency that aligns with typical cleaning motions, the system may synchronize with the operator's natural cleaning rhythm, further enhancing comfort and minimizing the perceived effort of the cleaning task. The adjustable stiffness of the elastic tether, achievable through methods such as selectively combining multiple elastic components, allows the operator to easily fine-tune the system's properties. This adjustability can accommodate variations in cleaning equipment weight and operator preferences, optimizing support and comfort across diverse cleaning scenarios.

[0010] Positioning the attachment point in front of the operator's torso at an ergonomically advantageous height can create an optimal working position, potentially reducing strain on the upper body during extended cleaning sessions. The ability to adjust the attachment position laterally along a substantially horizontal part of the carrying arm, situated in front of the user's torso, may accommodate operators with different dominant hands or preferred working styles. This feature enhances versatility and user comfort. The relatively horizontal arrangement of the laterally extending part of the carrying arm maintains a consistent working height across its length, facilitating smooth side-to-side movements during cleaning operations.

[0011] By equipping the harness with a rigid back support structure, weight can be evenly distributed across the operator's body, further enhancing comfort during prolonged use and mitigating the risk of strain injuries. An adjustable attachment mechanism for the carrying arm allows for precise tuning of the system's geometry, ensuring optimal positioning for operators of various body types and sizes.

[0012] A specifically adapted pole connector, e.g. formed by a cap connected to the end of the elastic tether, can be used securely attach the extension pole to the support system, potentially preventing accidental disconnection during use and enhancing overall safety. By incorporating an adaptive internal structure, particularly one comprising a stepped configuration, the connector can accommodate extension poles of various dimensions and / or different parts of a telescope pole. The system may also integrate features to support water-fed cleaning operations, such as a passage for a liquid supply hose that can be fed through a hole in the pole connector. This integration may expand the range of cleaning tasks that can be performed, enhancing the system's utility across various cleaning applications.BRIEF DESCRIPTION OF DRAWINGS

[0013] These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawing wherein: FIG 1 illustrates a system and method for facilitating use of cleaning equipment; FIGs 2A and 2B illustrates a back and forth swinging motion of the cleaning equipment being facilitated by the system; FIGs 3A and 3B illustrate the system with the cleaning equipment supported on a right-side attachment position; FIGs 3C and 3D illustrate the system with the cleaning equipment supported on a left-side attachment position; FIGs 4A - 4D illustrate various views and measurements of a preferred system. DESCRIPTION OF EMBODIMENTS

[0014] Terminology used for describing particular embodiments is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that the terms "comprises" and / or "comprising" specify the presence of stated features but do not preclude the presence or addition of one or more other features. It will be further understood that when a particular step of a method is referred to as subsequent to another step, it can directly follow said other step or one or more intermediate steps may be carried out before carrying out the particular step, unless specified otherwise. Likewise it will be understood that when a connection between structures or components is described, this connection may be established directly or through intermediate structures or components unless specified otherwise.

[0015] The invention is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. In the drawings, the absolute and relative sizes of systems, components, layers, and regions may be exaggerated for clarity. Embodiments may be described with reference to schematic and / or cross-section illustrations of possibly idealized embodiments and intermediate structures of the invention. In the description and drawings, like numbers refer to like elements throughout. Relative terms as well as derivatives thereof should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description and do not require that the system be constructed or operated in a particular orientation unless stated otherwise.

[0016] FIG 1 illustrates a system 10 for facilitating use of cleaning equipment 20. As described herein, the cleaning equipment 20 comprises at a cleaning tool 21 configured to be attached at a distal end 22d of an extension pole 22. This may be used for cleaning a surface S at an elevated height Z above a ground level G. Typically, the extension pole 22 has a length of at least two meters, and may be extendable up to fifteen, eighteen, or even twenty meters, or more, depending on the specific cleaning application. The extension pole 22 is preferably telescopic and / or modular, allowing for adjustable length to reach various heights while maintaining maneuverability. The proximal end 22p of the extension pole 22 is held by the operator and connected to the system 10 via at least one elastic tether 14, which helps support the weight "W" of the cleaning tool 21 and extension pole 22. It will be understood that the proximal end 22p is the region of the extension pole 22 facing the operator, which is on the other side of the pole opposite to the distal end 22d where the cleaning tool 21 is located. Connection of the elastic tether 14 with the proximal end 22p of the extension pole 22 may include a connections at the tip of the extension pole 22 and / or a connection formed at a small distance from the tip of the extension pole 22, preferably below a position where the operator is holding the extension pole 22.

[0017] The system 10 comprises a harness 11 configured to be worn on an operator's torso "T". A carrying arm 12 is (in use) attached to the harness 11, preferably attached or attachable to a (rigid or semi-rigid) support panel integrated in the harness. In some embodiments, the carrying arm 12 is configured to be attached to the harness and / or support panel, via an adjustable attachment mechanism. This may allow for rotation of the carrying arm around a vertical axis and / or adjustment of the carrying arm in height.

[0018] In a preferred embodiment, the carrying arm 12 is attached or attachable on a back side "B" of the operator's torso "T". As illustrated, e.g. in FIG 4D, the carrying arm 12 extends from the back side "B" and curves around and / or over the operator's shoulder "S". In this way, the carrying arm 12 may be supported from the backside and provide at least one attachment position "A" on the frontside. This back-mounted design may advantageously provide a stable anchor point for the system, distribute the load evenly across the operator's back and shoulders, and / or improve overall balance during cleaning operations. The back support of the harness 11 may also include a rigid or semi-rigid panel, which can further enhance comfort during extended use by providing additional support and helping to maintain proper posture.

[0019] While the carrying arm 12 is preferably attached to, and supported exclusively from, the back side "B" of the harness 11, it is to be understood that other or further support positions and / or mechanisms for the carrying arm 12 on the harness may be used for providing the at least one attachment position "A" in front of the operator's torso "T", in particular in front of the chest and / or below the shoulders. For example, the carrying arm 12 may have alternative or additional support points on the front side of the harness, or it may be at least partially supported on the side(s) of the harness, and / or supported via the shoulder straps. For example, a carrying arm and / or means for providing the attachment position "A" may be attached to a front side of the harness 11, preferably in combination with a rigid front support plate for distributing the weight. Such variations could potentially offer different weight distribution patterns or allow for more customization options to suit various body types or specific cleaning tasks. While these variations may not provide all the advantages of the preferred back-mounted design, the remaining feature of providing at least one attachment position "A" for the elastic tether 14 in front of the operator's torso, preferably in front of the chest and / or below the shoulders, may facilitate the natural and efficient cleaning motions described herein.

[0020] The system 10 further comprises or couples to at least one elastic tether 14 which may be (reversibly) connected and / or connectible between the at least one attachment position "A" of the carrying arm 12 and a proximal end 22p of the extension pole 22 for at least partially supporting the weight "W" of the cleaning tool 21 and extension pole 22 via the carrying arm 12 and the harness 11 on the operator's torso "T".

[0021] Preferably, the system 10 is configured to provide the at least one attachment position "A" arranged in front of the operator's chest, e.g. in front of or near the operator's sternum, when the harness 11 is worn on the operator's torso "T". It will be understood that the torso generally refers to the main part of the human body, excluding the head, neck, arms, and legs. For example, the torso may extend from the base of the neck to the hips, and include the chest, abdomen, and back. Furthermore, it will be understood that the chest refers to the upper front part of the torso. For example, the chest may be considered as the area enclosed by the ribs, breastbone (sternum), and spine. Furthermore, it will be understood that the breastbone or sternum is at the front center of the chest.

[0022] In a preferred embodiment, the system 10 comprises or couples (via the elastic tether 14) to a pole connector 15. The pole connector 15 may be used for connecting the elastic tether 14 to the proximal end 22p of the extension pole 22. Preferably, the pole connector 15 comprises a cap. For example, a receiving side of the cap is open for receiving the proximal end 22p of the extension pole 22, and a stop side of the cap, opposite the receiving side, is closed and / or comprises an abutment surfaces for stopping and / or supporting the proximal end 22p. The cap may have a tubular structure for fitting around the proximal end of the extension pole 22. Alternative to a cap also other or further coupling structures may be used to connect the end of the elastic tether 14 to the proximal end 22p of the extension pole 22, such as a hook, carabiner, et cetera.

[0023] In some embodiments, the pole connector 15, e.g. cap, has a fixation structure and / or mechanism for keeping the proximal end 22p inside the cap and / or prevent the proximal end 22p from inadvertently leaving the cap during operation. For example, the pole connector 15may comprise one or more of a resilient fitting structure, e.g. rubber fitting. Alternatively of in addition, a clamping, latching or locking mechanism may be provided to secure the proximal end 22p of the extension pole 22. In some embodiments, an inside of the pole connector 15 has a tubular structure with decreasing diameter from the receiving side of the cap to the stop side of the cap. For example, the pole connector 15 can be used to accommodate different pole diameters and / or a telescopic extension pole 22 may be used wherein the proximal end 22p a variable diameter depending on the number of extension pieces used. Advantageously, these different diameters may be accommodated at different depth inside the pole connector 15, preferably with a resilient material inside.

[0024] Preferably, an inside of the pole connector 15, e.g. cap, has a tubular staircase structure, i.e. step-wise decreasing diameter. Each step may be adapted to fit a specific diameter, e.g.one of the extension pieces of the telescopic extension pole 22. For example, the diameter of the next step down is sufficiently narrow to support the proximal end 22p of that piece, while allowing the next smaller diameter extension piece to pass through. Advantageously, the step-wise decreasing diameter may allow the cap to be on the one hand sufficiently secured on the proximal end 22p, e.g. with resilient material, while on the other hand not getting completely stuck (which would more likely happen when using a resilient material with continuously decreasing diameter, especially in combination with up and down movement).

[0025] In some embodiments, the cleaning equipment 20 comprises a liquid supply liquid supply hose (not shown). In this case, the stop side of the pole connector 15, e.g. cap, preferably has an opening to allow the liquid supply hose to pass there through. The opening may still be smaller than a (minimum) diameter of the proximal end 22p of the extension pole 22. For example, the extension pole 22 is hollow to accommodate the liquid supply hose inside.

[0026] Preferably, the harness 11 comprises a back support panel (e.g. shown in FIG 4D), which may be rigid and / or contoured to fit against an operator's back. This may provide enhanced comfort during extended use and distribute weight evenly across the operator's back. The carrying arm 12 may be attached or attachable to the back support panel. The attachment of the carrying arm to the back support panel may include an adjustable mechanism. This mechanism may allow for rotation or pivoting of the carrying arm and / or adjustment in height, enabling the accommodate different operators, e.g. to adjust the position of the front attachment point to suit different tasks or personal preferences. The adjustability may also facilitate switching between left and right-sided operation. In some embodiments, the back support panel may include multiple attachment points or slots. These may allow for vertical adjustment of the carrying arm's position or for the attachment of additional accessories or support structures.

[0027] Typically, the harness 11 comprises a pair of shoulder straps extending from the top of the back support panel. These may be padded for comfort and / or adjustable to accommodate operators of different sizes and ensure a secure fit. Preferably, a waist belt is provided which may be attached to the lower portion of the back support panel. This can help transfer weight to the operator's hips, reducing strain on the shoulders and upper back. A chest strap may be provided connecting the two shoulder straps. This may increase stability and prevent the shoulder straps from slipping during use. Adjustment buckles on the shoulder straps and / or waist belt may allow for a customizable fit, enhancing comfort and ensuring the harness remains secure during movement.

[0028] In some embodiments (not shown), the harness 11 comprises pockets for carrying other equipment. In other or further embodiments, the harness comprises a power supply in pocket or otherwise. For example, the power supply may be used for actuating the tool and / or extension pole 22, operating a pump, or for operating any other actuator, e.g. aiding in the reciprocating motion. For example, a motor may be provided to automatically extend / retract the extension pole. Alternatively, or in addition, a motor for rotating or otherwise actuating the cleaning tool 21 may be provided.

[0029] FIGs 2A and 2B illustrates a back and forth swinging motion of the cleaning equipment 20 exerted by the operator, which is being facilitated by the system 10 and in particular at least one elastic tether 14 suspended between the attachment position on the carrying arm and the proximal end of the extension pole. Preferably, the at least one elastic tether 14 comprises a resilient material, structure and / or device configured to resiliently support a reciprocating motion of the cleaning tool 21 on the extension pole 22.

[0030] Preferably, the elastic tether 14 comprises at least one elastic rope. As will be understood, the elastic tether 14 is capable of significant stretching, e.g. stretching at least a factor two under the influence of a downward force exerted by the operator on the extension pole 22 and / or the weight of the cleaning equipment 20. Furthermore the elastic tether 14 is capable of resiliently recovering its shape by an elastic restoring force of the elastic tether 14, e.g. when the operator stops exerting downward force and / or exerts an upward force. Preferably, the elastic tether has a relaxed (unstretched) length in a range between twenty and forty centimeters, most preferably around twenty-eight centimeters. When supporting the weight of the pole with cleaning equipment at equilibrium, the tether preferably stretches to a length in a range between forty and one hundred forty centimeter, most preferably around sixty centimeters. During use, the maximum stretched length of the tether is preferably up to one hundred twenty centimeters not exceeding one hundred forty centimeters. These dimensions may allow for significant extension of the elastic tether during use, providing a wide range of motion for the cleaning equipment while maintaining elastic support. The ratio between the relaxed length and the equilibrium stretched length is preferably 1:2 (e.g. 28 cm to 60 cm), or more, which may provide substantial elastic potential energy storage capacity. The maximum stretch ratio during use is preferably about 1:4 (e.g. 28 cm to 120 cm), allowing for considerable flexibility in cleaning motions while still providing effective support and recoil. This range of possible lengths accommodates variations in operator preference, cleaning task requirements, and manufacturing tolerances. As will be appreciated the motion may be significantly supported by the elastic force in the upward direction and gravitational force in the downward direction. Also other or further resilient means may be provided such as a spring and / or (spring loaded), pulley device.

[0031] Preferably, elastic properties of the elastic tether 14 are configured (e.g. in combination with a predetermined mass of the cleaning equipment 20, length of the tether, et cetera) to provide a natural frequency to an up and down and / or back and forth motion of the cleaning equipment 20 supported by the elastic tether 14, wherein the natural frequency (e.g., resonant frequency) is preferably between 0.3 and 2 Hertz, more preferably between 0.4 and 1.5 Hertz, most preferably between 0.5 and 1 Hertz. The inventor finds that, by matching the natural frequency of the system with a natural or preferred frequency of the cleaning motion, a resonance effect may be achieved which can make the cleaning motion feel more effortless and natural. Natural frequencies which are tuned to be in the aforementioned preference ranges may advantageously support a cleaning motion that is both efficient in terms of the number of cleaning motions per unit of time, as well as sustainable in terms of bodily exertion and maximum duration. Without being bound by theory, it may be noted that the natural frequency of the system may be tuned, e.g., by adapting the length and / or stiffness of the elastic tether 14. For example, a higher stiffness and / or shorter length of the tether may correspond to a higher natural frequency, which in turn may support a faster cleaning motion and / or support a higher mass at the same frequency.

[0032] In some embodiments, a stiffness of the elastic tether 14 is adjustable by selectively combining two or more elastic ropes (preferably in parallel) to form the elastic tether 14, e.g. extending between the attachment position "A" on the carrying arm 12 and a pole connector 15 and / or position at which the elastic tether 14 is to be attached to the proximal end 22p of the extension pole 22. Preferably, the system 10 (or a kit of parts) includes two or more elastic ropes, which may have a different spring constant K1 ≠ K2. In this way more combinations of different (total) spring constants (K1, K2, K1+K2) may be achieved by selective combinations. For example, the second spring constant K2 may be higher than the first spring constant K1 by at least a factor two. By using the relatively high spring constant K2, and adding or removing the relatively small spring constant K1, the natural frequency of the system may be easily adjusted around an optimum, e.g. depending on the mass of the cleaning equipment 20. For example, the mass of the cleaning equipment 20 may vary depending on a length of the extension pole 22, and the elastic tether 14 may be adjusted accordingly.

[0033] FIGs 3A and 3B illustrate the system 10 with the cleaning equipment 20 supported on a right-side attachment position "Ar". FIGs 3C and 3D illustrate the system 10 with the cleaning equipment 20 supported on a left-side attachment position "Al". In some embodiments, the carrying arm 12 has a laterally extending part, configured to laterally extend in front of the operator's torso "T" along a left-right direction (L←→R, e.g. illustrated in FIG 4A). Preferably, the attachment position "A" of the elastic tether 14 is adjustable along the left-right direction of the laterally extending part. As illustrated. this may allow the operator switching between different positions. For example, the elastic tether 14 is attached to the carrying arm 12 via a loop which may be slid along the left-right direction of the laterally extending part. Preferably, the loop comprises a resilient material and clamping structure providing an attachment force to keep the loop in place during a reciprocating movement of the cleaning equipment 20. By allowing the operator to switch the attachment position "A", an optimal position may be selected depending on how the operator holds the cleaning equipment 20.

[0034] FIGs 4A - 4D illustrate various views and measurements of a preferred embodiment. As shown in FIG 4D, the carrying arm 12 is preferably attached and / or attachable on a back side "B" of the harness 11, in use behind the operator's torso "T", extending from the back side "B" curving around one side of the operator's torso "T", and extending towards the attachment position "A" in front of the operator's torso "T". In the embodiments shown, the carrying arm 12 extends around the left side "L" of the operator's torso "T". Of course it will be understood that the system, or at least the carrying arm 12, may also be mirrored.

[0035] In a preferred embodiment, e.g. as shown in FIG 4B, a maximum height "H" of the carrying arm 12 is at a distance "HH" below a top the operator's head. Most preferably, the carrying arm 12 is arrange at a height "EH" below the operator's eye height, at least at the position where the carrying arm passes on the left or right side of the operators head (or torso). In this way the operator's view may be essentially unrestricted by the carrying arm especially when the carrying arm also tilts downward in a forward direction "F", as also illustrated in FIG 4B.

[0036] In a preferred embodiment, e.g. as shown in FIG 4D, the carrying arm 12 is configured to curve in relatively close proximity around the operator's left or right shoulder, e.g. with a clearance distance "SW" between five and twenty five centimeters, preferably less than twenty, or even less than fifteen centimeters. This clearance may ensure sufficient freedom of movement for the operator's arms while maintaining the support arm in close proximity to the body for optimal weight distribution.

[0037] In some embodiments, a preferred left or right position at which the carrying arm 12 curves around the operator's head, torso, or shoulders may depend on the right or left handedness of the operator. For example, a right handed person may benefit from keeping the right side more open by having the carrying arm 12 curving around the left side of the operator's torso "T". The left or right side positioning of the carrying arm 12 may also depend in the operator's preferred or predominant stance for cleaning, as will be further illustrated in FIGs 2 and 3. In some embodiments, both a left and right side carrying arm 12 is provided with one harness 11. For example, these may be exchangeably attached to the back side "B" of the harness 11 to suit operator preference. In other or further embodiments, a height and / or rotation of the carrying arm 12 may be adjustable, e.g. by providing one or more adjustable attachment devices 11b on the back side "B" of the harness 11 as illustrated in FIG 4D.

[0038] The inventor finds that by providing an attachment position "A" close to the operator's chest or sternum, a favorable support position for resiliently operating the cleaning equipment 20, and in particular the proximal end 22p or the extension pole 22, may be created. Having the attachment position "A" relatively close to the center or core of the operator's body, in combination with the elastic tether, may facilitate a well-controlled and natural back-and-forth movement during cleaning operations. Most preferably, the attachment position "A" is distanced at least a few centimeter in front of the torso and / or chest, but not too far. For example, as shown in FIGs 4A and 4B, the attachment position "A" may be arranged at a distance "FA" in front of a front side "F" of the operator's torso, wherein the distance "FA" is between five and thirty centimeters, preferably less than twenty centimeters. This preferred range may keep the support point relatively close to the operator's core, while providing sufficient distance to prevented the operator inadvertently coming in contact with the carrying arm 12.

[0039] In a preferred embodiment, e.g. as illustrated in FIG 4A, the at least one attachment position "A", is arranged in front of the operator's torso "T" at a distance "SA" below a (top) height "S" of the operator's shoulders when wearing the harness 11. Preferably, the attachment position "A" is at least some distance, but not too far, below the top height position S the operator's shoulders. For example, the distance "SA" is between zero and twenty centimeter below the top height "S" of the shoulders, preferably between five and ten centimeter. Without being bound by theory, the inventor finds that optimizing the attachments position "A at or around the height of the operator's sternum, may provide optimal support close to the operator's core or center of motion while allowing a most natural range of motion.

[0040] In the embodiment as shown in FIG 4A, the carrying arm 12 is dimensioned so that the attachment position "A" is arranged at a height "LA" above the lowest point "L" of the carrying arm 12 on the backside "B", and arranged at a forward distance "BA" from the vertical part on the backside "B". Preferably, the height "LA" is at least twenty thirty centimeter, more preferably at least thirty five centimeter; and preferably less than forty five centimeter, more preferably less than forty centimeter. Preferably, the distance "BA" is at least twenty five centimeter, more preferably at least thirty centimeter; and preferably less than fifty centimeter, more preferably less than forty centimeter. Of course these measurements may also depend on the size of the operator.

[0041] In some embodiments, the at least one attachment position "A", is arranged at an at an off-center position in front of the operator's torso "T". For example, a left-right off-center distance "CA" between a center plane "C" of the harness 11 and / or operator's torso "T" and an attachment position "A" (e.g. at an end of the carrying arm 12) is at least five centimeter, preferably at least ten centimeter. Most preferably, the position of the attachment position "A" can be variably set by an operator at different positions on both left and right sides of the center plane C, e.g. up to at least ten centimeter on each side of the center plane C.

[0042] In some embodiments, a laterally extending part of the carrying arm 12 extending in front of the operator's torso "T" is arranged relatively horizontally, e.g. extending at an angle θ of less than thirty degrees with respect to horizontal left-right direction L,R, preferably with an angle of less than twenty degrees. In this way, the attachment position "A" may be varied along the laterally extending part while maintaining approximately the same height. In other or further embodiments, the laterally extending part of the carrying arm 12 may be sloped downward starting from the portion curved around the operator's torso "T", e.g. with a downward angle θ of at least five degrees, or at least ten degrees. For example, the at least one attachment position "A" may be relatively lower than a maximum height H of the carrying arm 12.

[0043] For the purpose of clarity and a concise description, features are described herein as part of the same or separate embodiments, however, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described. For example, while embodiments were shown for a specific configuration of the carrying arm and attachment positions, also alternative ways may be envisaged by those skilled in the art having the benefit of the present disclosure for achieving a similar function and result. E.g. the carrying arm may be combined or split up into one or more alternative components, such as a modular design allowing for different configurations based on the specific cleaning task. While the back-mounted configuration of the carrying arm offers as described herein offers notable advantages, variants of the system may include front-mounted, side-mounted, or shoulder-supported configurations, or even designs where the attachment point for the elastic tether is directly integrated into the front of the harness, each potentially offering benefits for specific cleaning scenarios or operator preferences while maintaining the advantages of a front-positioned attachment point for an elastic tether facilitating natural and efficient cleaning motions.

[0044] The various elements of the embodiments as discussed and shown offer certain advantages, such as improved ergonomics, reduced operator fatigue, and increased cleaning efficiency at elevated heights. Of course, it is to be appreciated that any one of the above embodiments or processes may be combined with one or more other embodiments or processes to provide even further improvements in finding and matching designs and advantages. It is appreciated that this disclosure offers particular advantages to cleaning operations at elevated heights, especially in contexts where traditional scaffolding or aerial work platforms may be impractical or costly, and in general can be applied for any application wherein a user needs to manipulate a tool at the end of an extension pole in a reciprocating motion while maintaining stability and reducing physical strain.

[0045] In interpreting the appended claims, it should be understood that the word "comprising" does not exclude the presence of other elements or acts than those listed in a given claim; the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements; any reference signs in the claims do not limit their scope; several "means" may be represented by the same or different item(s) or implemented structure or function; any of the disclosed devices or portions thereof may be combined together or separated into further portions unless specifically stated otherwise.

Examples

Embodiment Construction

[0014]Terminology used for describing particular embodiments is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that the terms "comprises" and / or "comprising" specify the presence of stated features but do not preclude the presence or addition of one or more other features. It will be further understood that when a particular step of a method is referred to as subsequent to another step, it can directly follow said other step or one or more intermediate steps may be carried out before carrying out the particular step, unless specified otherwise. Likewise it will be understood that when a connection between structures or components is described, this connection may be established directly or through intermediate stru...

TECHNICAL FIELD AND BACKGROUND

[0001] The present invention relates to systems and methods to facilitate the use of cleaning equipment for an operator, in particular for cleaning surfaces at elevated heights.

[0002] Cleaning surfaces at elevated heights, such as windows on tall buildings, poses significant challenges to operators of cleaning equipment. At low to medium heights, ladders may be used. However, these presents inherent safety risks due to potential falls and the difficulty of maintaining stability while working. For more extensive or higher elevation work, aerial work platforms may be employed. However, these may come with their own set of challenges including high rental costs, limited maneuverability in tight spaces, and the need for specialized training to operate safely. By attaching the cleaning tool at the end of an extension pole, operators can reach elevated surfaces while remaining at ground level or on a lower, more stable platform. This approach increases safety by reducing the need for ladders or aerial platforms in many situations, improves efficiency by allowing a larger area to be cleaned from a single position, and can be more cost-effective than renting specialized equipment. However, such cleaning equipment may be heavy and difficult to maneuver, leading to fatigue and potential safety risks.

[0003] To alleviate physical strain and improve control of the cleaning equipment, the present inventor has previously disclosed in NL2013748B1 a method and apparatus for handling a tool on an extension pole supported using a harness worn around the operator's torso. The harness includes a tube that starts by extending primarily vertically upward from the operator's back. This tube then curves sharply, forming an arch that extends above and beyond the operator's head. The tube terminates at an end point positioned above the operator's head. At this elevated end point, a suspension device is attached. This device incorporates a cord, cable, or rope that hangs down in front of the operator, with an attachment means for the tool at its lower end. The tool itself is attached to the far end of an elongated extendable pole, which is supported by the attachment means near its opposite end. This overhead configuration, with the support point located above the operator's head, aims to provide a mechanical advantage for lifting and maneuvering the cleaning tool.

[0004] While the known harness with overhead pole configuration provides notable advantages in operating a cleaning tool on an extension pole, there remains a need to further improve tool support and weight distribution, in particular to facilitate a more natural posture and motion of the operator.SUMMARY

[0005] Aspects of the present invention can be embodied as systems and methods for facilitating use of cleaning equipment by an operator. The cleaning equipment comprises a cleaning tool, such as a brush and / or squeegee, attached at the distal end of an extension pole. The cleaning tool, operated via the extension pole, may be used for cleaning a surface, such as a window or wall, at elevated heights. A harness is configured to be worn on the operator's torso. A carrying arm is configured to be attached to the harness for providing at least one attachment position on a portion of the carrying arm in front of the operator's torso. A tether is connectible between the at least one attachment position on the carrying arm and the proximal end of the extension pole. Accordingly, a substantial part of the weight of the cleaning tool and extension pole may be supported via the carrying arm and the harness on the operator's torso.

[0006] According to the invention, an elastic tether is attached to the carrying arm at an attachment position arranged in front of the operator's torso, preferably at a small distance in front of the chest. The inventor surprising finds that such relatively low, front-mounted attachment point allows for a more natural back-and-forth movement when operating the cleaning equipment, in particular when the cleaning equipment is supported via the elastic tether, e.g. comprising an elastic material and / or spring. Without being bound by theory, advantages of the invention may be attributed to an advantageous combination of factors. The position of the attachment point, close and in front of the operator's torso, in particular the chest, may create a favorable support position close to the center or core of the operator's body. Due to the relatively short length of the elastic cord (compared to an overhead configuration), a more responsive and controllable support mechanism may be provided. The elastic or spring constant of the cord, combined with the lower mounting point, may result in a balance of forces that feels more intuitive and less strenuous for the operator, in particular when operating the tool in an elastically supported back and forth cleaning motion. While performing this motion, the operator may take particular advantage of a natural frequency of the system. For example, the natural frequency, may be relatively high due to the shorter cord length and / or possibly increased elastic / spring constant, to align more closely with a natural rhythm of human arm movements during cleaning tasks. This may create an elastically supported resonance effect, making the cleaning motion feel more effortless and allowing for faster, more controlled movements. This synergy between the system's mechanics and human biomechanics may thus contribute to reduced fatigue and increased efficiency, especially during extended cleaning sessions at elevated heights.

[0007] Advantageously, the carrying arm may be attached to the harness on a back side of the operator's torso, extending from the back side around the operator's torso for providing the at least one attachment position in front of the operator's torso. The back-mounted design of the carrying arm may effectively distribute the load across the operator's back and shoulders, which can reduce strain and improve balance during cleaning operations. This ergonomic weight distribution may further alleviate fatigue during extended use. As described herein, the back mounting may allow the carrying arm to extend around the operator's torso, e.g. around one of the shoulders and preferably below eye height, without substantially restricting arm movement or vision, offering support while maintaining freedom of motion and overview of the environment. This configuration may thus enhance the stability and control of cleaning motions, particularly when combined with the front attachment point and elastic tether.

[0008] Advantageously, the elastic tether may resiliently support a reciprocating motion of the operator using the cleaning equipment. Typically, this reciprocating motion may be predominantly vertical, while also incorporating a horizontal component depending on the angle of the extension pole relative to the surface being cleaned. This resilient support can facilitate an efficient cleaning motion, potentially reducing operator fatigue and enhancing overall productivity. The tether's capacity for significant stretching during the reciprocating motion can provide an extensive range of movement, enabling the operator to employ large strokes to clean a substantial area without frequent positional adjustments.

[0009] By engineering the elastic properties to provide a natural frequency that aligns with typical cleaning motions, the system may synchronize with the operator's natural cleaning rhythm, further enhancing comfort and minimizing the perceived effort of the cleaning task. The adjustable stiffness of the elastic tether, achievable through methods such as selectively combining multiple elastic components, allows the operator to easily fine-tune the system's properties. This adjustability can accommodate variations in cleaning equipment weight and operator preferences, optimizing support and comfort across diverse cleaning scenarios.

[0010] Positioning the attachment point in front of the operator's torso at an ergonomically advantageous height can create an optimal working position, potentially reducing strain on the upper body during extended cleaning sessions. The ability to adjust the attachment position laterally along a substantially horizontal part of the carrying arm, situated in front of the user's torso, may accommodate operators with different dominant hands or preferred working styles. This feature enhances versatility and user comfort. The relatively horizontal arrangement of the laterally extending part of the carrying arm maintains a consistent working height across its length, facilitating smooth side-to-side movements during cleaning operations.

[0011] By equipping the harness with a rigid back support structure, weight can be evenly distributed across the operator's body, further enhancing comfort during prolonged use and mitigating the risk of strain injuries. An adjustable attachment mechanism for the carrying arm allows for precise tuning of the system's geometry, ensuring optimal positioning for operators of various body types and sizes.

[0012] A specifically adapted pole connector, e.g. formed by a cap connected to the end of the elastic tether, can be used securely attach the extension pole to the support system, potentially preventing accidental disconnection during use and enhancing overall safety. By incorporating an adaptive internal structure, particularly one comprising a stepped configuration, the connector can accommodate extension poles of various dimensions and / or different parts of a telescope pole. The system may also integrate features to support water-fed cleaning operations, such as a passage for a liquid supply hose that can be fed through a hole in the pole connector. This integration may expand the range of cleaning tasks that can be performed, enhancing the system's utility across various cleaning applications.BRIEF DESCRIPTION OF DRAWINGS

[0013] These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawing wherein: FIG 1 illustrates a system and method for facilitating use of cleaning equipment; FIGs 2A and 2B illustrates a back and forth swinging motion of the cleaning equipment being facilitated by the system; FIGs 3A and 3B illustrate the system with the cleaning equipment supported on a right-side attachment position; FIGs 3C and 3D illustrate the system with the cleaning equipment supported on a left-side attachment position; FIGs 4A - 4D illustrate various views and measurements of a preferred system. DESCRIPTION OF EMBODIMENTS

[0014] Terminology used for describing particular embodiments is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that the terms "comprises" and / or "comprising" specify the presence of stated features but do not preclude the presence or addition of one or more other features. It will be further understood that when a particular step of a method is referred to as subsequent to another step, it can directly follow said other step or one or more intermediate steps may be carried out before carrying out the particular step, unless specified otherwise. Likewise it will be understood that when a connection between structures or components is described, this connection may be established directly or through intermediate structures or components unless specified otherwise.

[0015] The invention is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. In the drawings, the absolute and relative sizes of systems, components, layers, and regions may be exaggerated for clarity. Embodiments may be described with reference to schematic and / or cross-section illustrations of possibly idealized embodiments and intermediate structures of the invention. In the description and drawings, like numbers refer to like elements throughout. Relative terms as well as derivatives thereof should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description and do not require that the system be constructed or operated in a particular orientation unless stated otherwise.

[0016] FIG 1 illustrates a system 10 for facilitating use of cleaning equipment 20. As described herein, the cleaning equipment 20 comprises at a cleaning tool 21 configured to be attached at a distal end 22d of an extension pole 22. This may be used for cleaning a surface S at an elevated height Z above a ground level G. Typically, the extension pole 22 has a length of at least two meters, and may be extendable up to fifteen, eighteen, or even twenty meters, or more, depending on the specific cleaning application. The extension pole 22 is preferably telescopic and / or modular, allowing for adjustable length to reach various heights while maintaining maneuverability. The proximal end 22p of the extension pole 22 is held by the operator and connected to the system 10 via at least one elastic tether 14, which helps support the weight "W" of the cleaning tool 21 and extension pole 22. It will be understood that the proximal end 22p is the region of the extension pole 22 facing the operator, which is on the other side of the pole opposite to the distal end 22d where the cleaning tool 21 is located. Connection of the elastic tether 14 with the proximal end 22p of the extension pole 22 may include a connections at the tip of the extension pole 22 and / or a connection formed at a small distance from the tip of the extension pole 22, preferably below a position where the operator is holding the extension pole 22.

[0017] The system 10 comprises a harness 11 configured to be worn on an operator's torso "T". A carrying arm 12 is (in use) attached to the harness 11, preferably attached or attachable to a (rigid or semi-rigid) support panel integrated in the harness. In some embodiments, the carrying arm 12 is configured to be attached to the harness and / or support panel, via an adjustable attachment mechanism. This may allow for rotation of the carrying arm around a vertical axis and / or adjustment of the carrying arm in height.

[0018] In a preferred embodiment, the carrying arm 12 is attached or attachable on a back side "B" of the operator's torso "T". As illustrated, e.g. in FIG 4D, the carrying arm 12 extends from the back side "B" and curves around and / or over the operator's shoulder "S". In this way, the carrying arm 12 may be supported from the backside and provide at least one attachment position "A" on the frontside. This back-mounted design may advantageously provide a stable anchor point for the system, distribute the load evenly across the operator's back and shoulders, and / or improve overall balance during cleaning operations. The back support of the harness 11 may also include a rigid or semi-rigid panel, which can further enhance comfort during extended use by providing additional support and helping to maintain proper posture.

[0019] While the carrying arm 12 is preferably attached to, and supported exclusively from, the back side "B" of the harness 11, it is to be understood that other or further support positions and / or mechanisms for the carrying arm 12 on the harness may be used for providing the at least one attachment position "A" in front of the operator's torso "T", in particular in front of the chest and / or below the shoulders. For example, the carrying arm 12 may have alternative or additional support points on the front side of the harness, or it may be at least partially supported on the side(s) of the harness, and / or supported via the shoulder straps. For example, a carrying arm and / or means for providing the attachment position "A" may be attached to a front side of the harness 11, preferably in combination with a rigid front support plate for distributing the weight. Such variations could potentially offer different weight distribution patterns or allow for more customization options to suit various body types or specific cleaning tasks. While these variations may not provide all the advantages of the preferred back-mounted design, the remaining feature of providing at least one attachment position "A" for the elastic tether 14 in front of the operator's torso, preferably in front of the chest and / or below the shoulders, may facilitate the natural and efficient cleaning motions described herein.

[0020] The system 10 further comprises or couples to at least one elastic tether 14 which may be (reversibly) connected and / or connectible between the at least one attachment position "A" of the carrying arm 12 and a proximal end 22p of the extension pole 22 for at least partially supporting the weight "W" of the cleaning tool 21 and extension pole 22 via the carrying arm 12 and the harness 11 on the operator's torso "T".

[0021] Preferably, the system 10 is configured to provide the at least one attachment position "A" arranged in front of the operator's chest, e.g. in front of or near the operator's sternum, when the harness 11 is worn on the operator's torso "T". It will be understood that the torso generally refers to the main part of the human body, excluding the head, neck, arms, and legs. For example, the torso may extend from the base of the neck to the hips, and include the chest, abdomen, and back. Furthermore, it will be understood that the chest refers to the upper front part of the torso. For example, the chest may be considered as the area enclosed by the ribs, breastbone (sternum), and spine. Furthermore, it will be understood that the breastbone or sternum is at the front center of the chest.

[0022] In a preferred embodiment, the system 10 comprises or couples (via the elastic tether 14) to a pole connector 15. The pole connector 15 may be used for connecting the elastic tether 14 to the proximal end 22p of the extension pole 22. Preferably, the pole connector 15 comprises a cap. For example, a receiving side of the cap is open for receiving the proximal end 22p of the extension pole 22, and a stop side of the cap, opposite the receiving side, is closed and / or comprises an abutment surfaces for stopping and / or supporting the proximal end 22p. The cap may have a tubular structure for fitting around the proximal end of the extension pole 22. Alternative to a cap also other or further coupling structures may be used to connect the end of the elastic tether 14 to the proximal end 22p of the extension pole 22, such as a hook, carabiner, et cetera.

[0023] In some embodiments, the pole connector 15, e.g. cap, has a fixation structure and / or mechanism for keeping the proximal end 22p inside the cap and / or prevent the proximal end 22p from inadvertently leaving the cap during operation. For example, the pole connector 15may comprise one or more of a resilient fitting structure, e.g. rubber fitting. Alternatively of in addition, a clamping, latching or locking mechanism may be provided to secure the proximal end 22p of the extension pole 22. In some embodiments, an inside of the pole connector 15 has a tubular structure with decreasing diameter from the receiving side of the cap to the stop side of the cap. For example, the pole connector 15 can be used to accommodate different pole diameters and / or a telescopic extension pole 22 may be used wherein the proximal end 22p a variable diameter depending on the number of extension pieces used. Advantageously, these different diameters may be accommodated at different depth inside the pole connector 15, preferably with a resilient material inside.

[0024] Preferably, an inside of the pole connector 15, e.g. cap, has a tubular staircase structure, i.e. step-wise decreasing diameter. Each step may be adapted to fit a specific diameter, e.g.one of the extension pieces of the telescopic extension pole 22. For example, the diameter of the next step down is sufficiently narrow to support the proximal end 22p of that piece, while allowing the next smaller diameter extension piece to pass through. Advantageously, the step-wise decreasing diameter may allow the cap to be on the one hand sufficiently secured on the proximal end 22p, e.g. with resilient material, while on the other hand not getting completely stuck (which would more likely happen when using a resilient material with continuously decreasing diameter, especially in combination with up and down movement).

[0025] In some embodiments, the cleaning equipment 20 comprises a liquid supply liquid supply hose (not shown). In this case, the stop side of the pole connector 15, e.g. cap, preferably has an opening to allow the liquid supply hose to pass there through. The opening may still be smaller than a (minimum) diameter of the proximal end 22p of the extension pole 22. For example, the extension pole 22 is hollow to accommodate the liquid supply hose inside.

[0026] Preferably, the harness 11 comprises a back support panel (e.g. shown in FIG 4D), which may be rigid and / or contoured to fit against an operator's back. This may provide enhanced comfort during extended use and distribute weight evenly across the operator's back. The carrying arm 12 may be attached or attachable to the back support panel. The attachment of the carrying arm to the back support panel may include an adjustable mechanism. This mechanism may allow for rotation or pivoting of the carrying arm and / or adjustment in height, enabling the accommodate different operators, e.g. to adjust the position of the front attachment point to suit different tasks or personal preferences. The adjustability may also facilitate switching between left and right-sided operation. In some embodiments, the back support panel may include multiple attachment points or slots. These may allow for vertical adjustment of the carrying arm's position or for the attachment of additional accessories or support structures.

[0027] Typically, the harness 11 comprises a pair of shoulder straps extending from the top of the back support panel. These may be padded for comfort and / or adjustable to accommodate operators of different sizes and ensure a secure fit. Preferably, a waist belt is provided which may be attached to the lower portion of the back support panel. This can help transfer weight to the operator's hips, reducing strain on the shoulders and upper back. A chest strap may be provided connecting the two shoulder straps. This may increase stability and prevent the shoulder straps from slipping during use. Adjustment buckles on the shoulder straps and / or waist belt may allow for a customizable fit, enhancing comfort and ensuring the harness remains secure during movement.

[0028] In some embodiments (not shown), the harness 11 comprises pockets for carrying other equipment. In other or further embodiments, the harness comprises a power supply in pocket or otherwise. For example, the power supply may be used for actuating the tool and / or extension pole 22, operating a pump, or for operating any other actuator, e.g. aiding in the reciprocating motion. For example, a motor may be provided to automatically extend / retract the extension pole. Alternatively, or in addition, a motor for rotating or otherwise actuating the cleaning tool 21 may be provided.

[0029] FIGs 2A and 2B illustrates a back and forth swinging motion of the cleaning equipment 20 exerted by the operator, which is being facilitated by the system 10 and in particular at least one elastic tether 14 suspended between the attachment position on the carrying arm and the proximal end of the extension pole. Preferably, the at least one elastic tether 14 comprises a resilient material, structure and / or device configured to resiliently support a reciprocating motion of the cleaning tool 21 on the extension pole 22.

[0030] Preferably, the elastic tether 14 comprises at least one elastic rope. As will be understood, the elastic tether 14 is capable of significant stretching, e.g. stretching at least a factor two under the influence of a downward force exerted by the operator on the extension pole 22 and / or the weight of the cleaning equipment 20. Furthermore the elastic tether 14 is capable of resiliently recovering its shape by an elastic restoring force of the elastic tether 14, e.g. when the operator stops exerting downward force and / or exerts an upward force. Preferably, the elastic tether has a relaxed (unstretched) length in a range between twenty and forty centimeters, most preferably around twenty-eight centimeters. When supporting the weight of the pole with cleaning equipment at equilibrium, the tether preferably stretches to a length in a range between forty and one hundred forty centimeter, most preferably around sixty centimeters. During use, the maximum stretched length of the tether is preferably up to one hundred twenty centimeters not exceeding one hundred forty centimeters. These dimensions may allow for significant extension of the elastic tether during use, providing a wide range of motion for the cleaning equipment while maintaining elastic support. The ratio between the relaxed length and the equilibrium stretched length is preferably 1:2 (e.g. 28 cm to 60 cm), or more, which may provide substantial elastic potential energy storage capacity. The maximum stretch ratio during use is preferably about 1:4 (e.g. 28 cm to 120 cm), allowing for considerable flexibility in cleaning motions while still providing effective support and recoil. This range of possible lengths accommodates variations in operator preference, cleaning task requirements, and manufacturing tolerances. As will be appreciated the motion may be significantly supported by the elastic force in the upward direction and gravitational force in the downward direction. Also other or further resilient means may be provided such as a spring and / or (spring loaded), pulley device.

[0031] Preferably, elastic properties of the elastic tether 14 are configured (e.g. in combination with a predetermined mass of the cleaning equipment 20, length of the tether, et cetera) to provide a natural frequency to an up and down and / or back and forth motion of the cleaning equipment 20 supported by the elastic tether 14, wherein the natural frequency (e.g., resonant frequency) is preferably between 0.3 and 2 Hertz, more preferably between 0.4 and 1.5 Hertz, most preferably between 0.5 and 1 Hertz. The inventor finds that, by matching the natural frequency of the system with a natural or preferred frequency of the cleaning motion, a resonance effect may be achieved which can make the cleaning motion feel more effortless and natural. Natural frequencies which are tuned to be in the aforementioned preference ranges may advantageously support a cleaning motion that is both efficient in terms of the number of cleaning motions per unit of time, as well as sustainable in terms of bodily exertion and maximum duration. Without being bound by theory, it may be noted that the natural frequency of the system may be tuned, e.g., by adapting the length and / or stiffness of the elastic tether 14. For example, a higher stiffness and / or shorter length of the tether may correspond to a higher natural frequency, which in turn may support a faster cleaning motion and / or support a higher mass at the same frequency.

[0032] In some embodiments, a stiffness of the elastic tether 14 is adjustable by selectively combining two or more elastic ropes (preferably in parallel) to form the elastic tether 14, e.g. extending between the attachment position "A" on the carrying arm 12 and a pole connector 15 and / or position at which the elastic tether 14 is to be attached to the proximal end 22p of the extension pole 22. Preferably, the system 10 (or a kit of parts) includes two or more elastic ropes, which may have a different spring constant K1 ≠ K2. In this way more combinations of different (total) spring constants (K1, K2, K1+K2) may be achieved by selective combinations. For example, the second spring constant K2 may be higher than the first spring constant K1 by at least a factor two. By using the relatively high spring constant K2, and adding or removing the relatively small spring constant K1, the natural frequency of the system may be easily adjusted around an optimum, e.g. depending on the mass of the cleaning equipment 20. For example, the mass of the cleaning equipment 20 may vary depending on a length of the extension pole 22, and the elastic tether 14 may be adjusted accordingly.

[0033] FIGs 3A and 3B illustrate the system 10 with the cleaning equipment 20 supported on a right-side attachment position "Ar". FIGs 3C and 3D illustrate the system 10 with the cleaning equipment 20 supported on a left-side attachment position "Al". In some embodiments, the carrying arm 12 has a laterally extending part, configured to laterally extend in front of the operator's torso "T" along a left-right direction (L←→R, e.g. illustrated in FIG 4A). Preferably, the attachment position "A" of the elastic tether 14 is adjustable along the left-right direction of the laterally extending part. As illustrated. this may allow the operator switching between different positions. For example, the elastic tether 14 is attached to the carrying arm 12 via a loop which may be slid along the left-right direction of the laterally extending part. Preferably, the loop comprises a resilient material and clamping structure providing an attachment force to keep the loop in place during a reciprocating movement of the cleaning equipment 20. By allowing the operator to switch the attachment position "A", an optimal position may be selected depending on how the operator holds the cleaning equipment 20.

[0034] FIGs 4A - 4D illustrate various views and measurements of a preferred embodiment. As shown in FIG 4D, the carrying arm 12 is preferably attached and / or attachable on a back side "B" of the harness 11, in use behind the operator's torso "T", extending from the back side "B" curving around one side of the operator's torso "T", and extending towards the attachment position "A" in front of the operator's torso "T". In the embodiments shown, the carrying arm 12 extends around the left side "L" of the operator's torso "T". Of course it will be understood that the system, or at least the carrying arm 12, may also be mirrored.

[0035] In a preferred embodiment, e.g. as shown in FIG 4B, a maximum height "H" of the carrying arm 12 is at a distance "HH" below a top the operator's head. Most preferably, the carrying arm 12 is arrange at a height "EH" below the operator's eye height, at least at the position where the carrying arm passes on the left or right side of the operators head (or torso). In this way the operator's view may be essentially unrestricted by the carrying arm especially when the carrying arm also tilts downward in a forward direction "F", as also illustrated in FIG 4B.

[0036] In a preferred embodiment, e.g. as shown in FIG 4D, the carrying arm 12 is configured to curve in relatively close proximity around the operator's left or right shoulder, e.g. with a clearance distance "SW" between five and twenty five centimeters, preferably less than twenty, or even less than fifteen centimeters. This clearance may ensure sufficient freedom of movement for the operator's arms while maintaining the support arm in close proximity to the body for optimal weight distribution.

[0037] In some embodiments, a preferred left or right position at which the carrying arm 12 curves around the operator's head, torso, or shoulders may depend on the right or left handedness of the operator. For example, a right handed person may benefit from keeping the right side more open by having the carrying arm 12 curving around the left side of the operator's torso "T". The left or right side positioning of the carrying arm 12 may also depend in the operator's preferred or predominant stance for cleaning, as will be further illustrated in FIGs 2 and 3. In some embodiments, both a left and right side carrying arm 12 is provided with one harness 11. For example, these may be exchangeably attached to the back side "B" of the harness 11 to suit operator preference. In other or further embodiments, a height and / or rotation of the carrying arm 12 may be adjustable, e.g. by providing one or more adjustable attachment devices 11b on the back side "B" of the harness 11 as illustrated in FIG 4D.

[0038] The inventor finds that by providing an attachment position "A" close to the operator's chest or sternum, a favorable support position for resiliently operating the cleaning equipment 20, and in particular the proximal end 22p or the extension pole 22, may be created. Having the attachment position "A" relatively close to the center or core of the operator's body, in combination with the elastic tether, may facilitate a well-controlled and natural back-and-forth movement during cleaning operations. Most preferably, the attachment position "A" is distanced at least a few centimeter in front of the torso and / or chest, but not too far. For example, as shown in FIGs 4A and 4B, the attachment position "A" may be arranged at a distance "FA" in front of a front side "F" of the operator's torso, wherein the distance "FA" is between five and thirty centimeters, preferably less than twenty centimeters. This preferred range may keep the support point relatively close to the operator's core, while providing sufficient distance to prevented the operator inadvertently coming in contact with the carrying arm 12.

[0039] In a preferred embodiment, e.g. as illustrated in FIG 4A, the at least one attachment position "A", is arranged in front of the operator's torso "T" at a distance "SA" below a (top) height "S" of the operator's shoulders when wearing the harness 11. Preferably, the attachment position "A" is at least some distance, but not too far, below the top height position S the operator's shoulders. For example, the distance "SA" is between zero and twenty centimeter below the top height "S" of the shoulders, preferably between five and ten centimeter. Without being bound by theory, the inventor finds that optimizing the attachments position "A at or around the height of the operator's sternum, may provide optimal support close to the operator's core or center of motion while allowing a most natural range of motion.

[0040] In the embodiment as shown in FIG 4A, the carrying arm 12 is dimensioned so that the attachment position "A" is arranged at a height "LA" above the lowest point "L" of the carrying arm 12 on the backside "B", and arranged at a forward distance "BA" from the vertical part on the backside "B". Preferably, the height "LA" is at least twenty thirty centimeter, more preferably at least thirty five centimeter; and preferably less than forty five centimeter, more preferably less than forty centimeter. Preferably, the distance "BA" is at least twenty five centimeter, more preferably at least thirty centimeter; and preferably less than fifty centimeter, more preferably less than forty centimeter. Of course these measurements may also depend on the size of the operator.

[0041] In some embodiments, the at least one attachment position "A", is arranged at an at an off-center position in front of the operator's torso "T". For example, a left-right off-center distance "CA" between a center plane "C" of the harness 11 and / or operator's torso "T" and an attachment position "A" (e.g. at an end of the carrying arm 12) is at least five centimeter, preferably at least ten centimeter. Most preferably, the position of the attachment position "A" can be variably set by an operator at different positions on both left and right sides of the center plane C, e.g. up to at least ten centimeter on each side of the center plane C.

[0042] In some embodiments, a laterally extending part of the carrying arm 12 extending in front of the operator's torso "T" is arranged relatively horizontally, e.g. extending at an angle θ of less than thirty degrees with respect to horizontal left-right direction L,R, preferably with an angle of less than twenty degrees. In this way, the attachment position "A" may be varied along the laterally extending part while maintaining approximately the same height. In other or further embodiments, the laterally extending part of the carrying arm 12 may be sloped downward starting from the portion curved around the operator's torso "T", e.g. with a downward angle θ of at least five degrees, or at least ten degrees. For example, the at least one attachment position "A" may be relatively lower than a maximum height H of the carrying arm 12.

[0043] For the purpose of clarity and a concise description, features are described herein as part of the same or separate embodiments, however, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described. For example, while embodiments were shown for a specific configuration of the carrying arm and attachment positions, also alternative ways may be envisaged by those skilled in the art having the benefit of the present disclosure for achieving a similar function and result. E.g. the carrying arm may be combined or split up into one or more alternative components, such as a modular design allowing for different configurations based on the specific cleaning task. While the back-mounted configuration of the carrying arm offers as described herein offers notable advantages, variants of the system may include front-mounted, side-mounted, or shoulder-supported configurations, or even designs where the attachment point for the elastic tether is directly integrated into the front of the harness, each potentially offering benefits for specific cleaning scenarios or operator preferences while maintaining the advantages of a front-positioned attachment point for an elastic tether facilitating natural and efficient cleaning motions.

[0044] The various elements of the embodiments as discussed and shown offer certain advantages, such as improved ergonomics, reduced operator fatigue, and increased cleaning efficiency at elevated heights. Of course, it is to be appreciated that any one of the above embodiments or processes may be combined with one or more other embodiments or processes to provide even further improvements in finding and matching designs and advantages. It is appreciated that this disclosure offers particular advantages to cleaning operations at elevated heights, especially in contexts where traditional scaffolding or aerial work platforms may be impractical or costly, and in general can be applied for any application wherein a user needs to manipulate a tool at the end of an extension pole in a reciprocating motion while maintaining stability and reducing physical strain.

[0045] In interpreting the appended claims, it should be understood that the word "comprising" does not exclude the presence of other elements or acts than those listed in a given claim; the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements; any reference signs in the claims do not limit their scope; several "means" may be represented by the same or different item(s) or implemented structure or function; any of the disclosed devices or portions thereof may be combined together or separated into further portions unless specifically stated otherwise.

Examples

Embodiment Construction

[0014]Terminology used for describing particular embodiments is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "and / or" includes any and all combinations of one or more of the associated listed items. It will be understood that the terms "comprises" and / or "comprising" specify the presence of stated features but do not preclude the presence or addition of one or more other features. It will be further understood that when a particular step of a method is referred to as subsequent to another step, it can directly follow said other step or one or more intermediate steps may be carried out before carrying out the particular step, unless specified otherwise. Likewise it will be understood that when a connection between structures or components is described, this connection may be established directly or through intermediate stru...

Claims

1. A system (10) for facilitating use of cleaning equipment (20) comprising a cleaning tool (21) attached at a distal end (22d) of an extension pole (22) for cleaning a surface (S) at an elevated height (Z) above a ground level (G), the system (10) comprising a harness (11) configured to be worn on an operator's torso (T); a carrying arm (12), in use, attached to the harness (11) for providing at least one attachment position (A) on a portion of the carrying arm located in front of the operator's torso (T); and at least one elastic tether (14) configured to connect between the at least one attachment position (A) of the carrying arm (12) and a proximal end (22p) of the extension pole (22) for at least partially supporting a weight (W) of the cleaning tool (21) and extension pole (22) via the elastic tether (14), the carrying arm (12), and the harness (11) on the operator's torso (T).

2. The system according to the preceding claim, wherein the carrying arm (12) is, in use, attached to the harness (11) on a back side (B) of the operator's torso (T), extending from the back side (B) around the operator's torso (T) for providing the at least one attachment position (A) on the portion of the carrying arm located in front of the operator's torso (T).

3. The system according to the preceding claim, wherein the carrying arm (12) extends from its attachment on the back side (B) of the harness (11), in use curving around either the side (L) or the right side (R) of the operator's torso (T) and / or head, preferably below eye height of the operator, and extending towards the attachment position (A) on the portion of the carrying arm located in front of the operator's torso (T).

4. The system (10) according to any of the preceding claims, configured to provide the at least one attachment position (A) on the portion of the carrying arm arranged at a distance (FA) in front of a front side (F) of the operator's chest, below a top height (S) of the operator's shoulders, when the harness (11) is worn on the operator's torso (T).

5. The system according to any of the preceding claims, wherein the at least one attachment position (A), is arranged on the portion of the carrying arm at an off-center position located in front of the operator's torso (T).

6. The system according to any of the preceding claims, wherein the carrying arm (12) has a laterally extending part, configured to laterally extend in front of the operator's torso (T) along a left-right direction (L,R) through a vertical center plane (C), wherein the attachment position (A) of the elastic tether (14) is adjustable to either one of a left-side attachment position (Al) on the carrying arm which is on the left side (L) of the vertical center plane (C) and a right-side attachment position (Ar) on the carrying arm which is on the right side (R) of the vertical center plane (C).

7. The system according to any of the preceding claims, wherein the harness (11) comprises a back support panel which is rigid and contoured to fit against the operator's back, wherein the carrying arm (12) is configured to be attached to the back support panel, wherein the harness (11) comprises a pair of shoulder straps extending from the top of the back support panel, and wherein the harness (11) preferably comprises a waist belt attached to the lower portion of the back support panel.

8. The system according to any of the preceding claims, wherein the at least one elastic tether (14) is configured to resiliently support a reciprocating motion of the cleaning equipment (20).

9. The system according to the preceding claim, wherein the at least one elastic tether (14) is capable of stretching by at least a factor two during the reciprocating motion, and resiliently recovering its shape by an elastic restoring force of the elastic tether (14).

10. The system according to any of the two preceding claims, wherein elastic properties of the elastic tether (14) are configured to provide a natural frequency to the reciprocating motion of the cleaning equipment (20) supported by the elastic tether (14), wherein the natural frequency is between 0.3 and 2 Hertz.

11. The system according to any of the preceding claims, wherein a stiffness of the elastic tether (14) is adjustable by selectively combining two or more elastic ropes to form the elastic tether (14).

12. The system according to any of the preceding claims, comprising a pole connector (15) for connecting the elastic tether (14) to the proximal end (22p) of the extension pole (22); wherein the pole connector (15) comprises a cap, wherein a receiving side of the cap is open for receiving the proximal end (22p) of the extension pole (22), and a stop side of the cap, opposite the receiving side, is closed and / or comprises an abutment surfaces for stopping and / or supporting the proximal end (22p). wherein the cap has a tubular structure for fitting around the proximal end of the extension pole (22). wherein the cap has a fixation structure and / or mechanism for keeping the proximal end (22p) inside the cap and / or prevent the proximal end (22p) from inadvertently leaving the cap during operation.

13. The system according to the preceding claim, wherein an inside of the cap has a tubular structure formed of a resilient material with step-wise decreasing diameter from the receiving side of the cap to the stop side of the cap.

14. A kit of parts for constructing the system (1) according to any of the preceding claims, the kit of parts comprising the harness (11), the carrying arm (12), the elastic tether (14), and a pole connector (15) for connecting the elastic tether (14) to an extension pole (22).

15. A method of cleaning a surface (S) at an elevated height (Z) above a ground level (G) by using cleaning equipment (20) comprising a cleaning tool (21) attached at a distal end (22d) of an extension pole (22), wherein the method is facilitated by a harness (11) worn on an operator's torso (T), wherein a carrying arm (12) is attached to the harness (11) to provide an attachment position (A) located in front of the operator's torso (T), wherein at least one elastic tether (14) is connected between the attachment position (A) of the carrying arm (12) and a proximal end (22p) of the extension pole (22) for at least partially supporting a weight (W) of the cleaning tool (21) and extension pole (22) via the elastic tether (14), the carrying arm (12), and the harness (11) on the operator's torso (T).

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