WO2018051141A1

WO2018051141A1 - Window cleaning apparatus with a telescopic pole

Info

Publication number: WO2018051141A1
Application number: PCT/GB2017/052776
Authority: WO
Inventors: Craig MAWLAM
Original assignee: Ionic Systems Limited
Priority date: 2016-09-19
Filing date: 2017-09-19
Publication date: 2018-03-22
Also published as: GB2549812B; GB2549812A; GB201615924D0

Abstract

The present application provides window cleaning apparatus (100) comprising: an elongate pole (102) comprising a plurality of telescopic pole members (103, 103a, 103b); a fluid inlet (118) to connect to a source of window cleaning fluid; and a head (106) provided at a distal end of the elongate pole (102) and comprising a fluid outlet (148) in fluid communication with the fluid inlet (118). A sectional profile (116) of each of mutually engaging surfaces of the plurality of telescopic pole members (103, 103a, 103b) define one of a plurality of non-circular shapes, whereby to substantially prevent mutual rotation of the telescopic members (103, 103a, 103b) around a longitudinal axis of the elongate pole (102).

Description

WINDOW CLEANING APPARATUS WITH A TELESCOPIC POLE

[0001] This invention relates to window cleaning apparatus.

BACKGROUND

[0002] In tall buildings, it is often necessary to ensure the outside facade, including a region of windows, remains clean. This ensures both a good aesthetic standard of the building and in particular the windows, but also to ensure optimal thermal and optical performance of the windows. A dirty window may lead to reduced transmission of light therethrough, potentially increasing lighting costs. Furthermore, a dirty window may also lead to increased heat absorption by the dirty particles adhered to the glass, potentially leading to an increase in costs associated with air conditioning systems in countries having warm outside temperatures during the day.

[0003] Several solutions exist for cleaning the facade, including windows, of tall buildings, including manually lowering a cradle containing window cleaners from a roof of the building. Another solution is to lower a window cleaner in a harness, for example by abseiling, down the side of a building. For some buildings, it may be possible to use a window cleaning pole extending upwards from the ground and supplying window cleaning fluid to a brush on the upper end of the window cleaning pole. In examples, the window cleaning pole is used to clean all the windows of a building within the height range of the window cleaning pole. In other examples, the window cleaning pole is only be used to clean the windows within the height range of the window cleaning pole, even if the building is taller than the height range of the window cleaning pole. Window cleaning poles of the prior art comprise a telescopically extending window cleaning pole, and a head comprising a plurality of bristles at one end of the window cleaning pole. Window cleaning fluid is typically passed up a tube running within the telescopically extending window cleaning pole to the head.

[0004] In one example of a prior art window cleaning pole, the window cleaning pole comprises an elongate pole comprising a plurality of telescopic pole members. Each of the telescopic pole members is hollow, and has a substantially circular cross-section. The telescopic pole members are each provided with a clamp at an upper end thereof to clamp adjacent telescopic pole members in the plurality of telescopic pole members at a desired extension position and a desired rotational position. The elongate pole has a proximal end arranged to be held by an operator in use, and on the ground, and a distal end connected to a pivotable head. The head comprises a plurality of bristles extending from a base of the head and is connected to the elongate pole via a pivotable connection. The pivotable connection is configured to be pivotable about an axis transverse to a longitudinal direction of the window cleaning pole. The base of the head has defined therein an opening for discharge of window cleaning fluid from the head towards a surface to be cleaned. The opening is in fluid communication with a flexible tube running outside the pivotable connection and passing within a distal-most telescopic pole member at a distal end thereof. The flexible tube extends within the plurality of telescopic pole members to a proximal end of a proximal-most telescopic pole member and is connected to a source of window cleaning fluid. A tap may be provided in the flexible tube, outside the window cleaning pole to temporarily restrict or stop the flow of window cleaning fluid at the head.

[0005] The window cleaning pole of the prior art suffers from a number of problems. Firstly, when the clamps are worn, or if the clamps are inaccurately manufactured, adjacent telescopic pole members may not be fixedly clamped in a rotational position, even when the clamp is closed. Such a problem can result in an unstable and unsafe window cleaning pole, as well as lead to an unsatisfactory window cleaning performance if the head is not exactly facing the surface to be cleaned.

[0006] Secondly, window cleaning fluid often does not contact at least some of the bristles of the head, or even the surface to be cleaned at all because the window cleaning fluid cannot reach the surface from the opening. In a related way, when the bristles are arranged with the opening in a clear region in the middle of a bristled region, some of the bristles are not provided with any window cleaning fluid, especially the bristles above the opening when the window cleaning pole is pushed upwards on the surface to be cleaned. This often results in a sub-standard window cleaning performance.

[0007] Another problem with the window cleaning pole of the prior art is that the flexible tube can catch or snag on features on or adjacent to the surface to be cleaned in the region where the flexible tube passes outside the pivotable connection. This can lead to inconvenience and damage of the window cleaning pole, or the building.

[0008] The tap can be difficult to operate by an operator of the window cleaning pole, because at least one hand must be kept on the pole at all times for safety. This can result in wastage of window cleaning fluid as the operator does not stop the flow of window cleaning fluid each time they move between different surfaces to be cleaned on a building, for example a window. Furthermore, the operator may let go of the window cleaning pole with both hands in order to operate the tap, which may be dangerous.

[0009] The present disclosure provides at least an alternative to window cleaning poles of the prior art.

BRIEF SUMMARY OF THE DISCLOSURE [0010] In accordance with an aspect of the present invention there is provided a window cleaning apparatus comprising an elongate pole, the elongate pole comprising a plurality of telescopic pole members. The apparatus further comprises a fluid inlet to connect to a source of window cleaning fluid and a head provided at a distal end of the elongate pole. The head comprises a fluid outlet in fluid communication with the fluid inlet. A sectional profile of each of mutually engaging surfaces of the plurality of telescopic pole members define one of a plurality of non-circular shapes, whereby to substantially prevent mutual rotation of the telescopic members around a longitudinal axis of the elongate pole.

[0011] Thus, even when the telescopic pole members of the elongate pole are only loosely clamped together, an operator away from a distal end of the elongate pole can manipulate the direction of the fluid outlet in the head by twisting a proximal-most pole member of the elongate pole. Conversely, in prior art telescopic pole members having a substantially circular cross-section, the telescopic pole members would be able to mutually rotate if not clamped together sufficiently tightly. Furthermore, an operator of the window cleaning apparatus may know a direction of the fluid outlet without looking because the head is not rotationally movable relative to any of the telescopic pole members about the longitudinal axis of the elongate pole.

[0012] In examples, each telescopic pole member is provided with a clamp operable to clamp the telescopic pole member in an extended position relative to an adjacent telescopic pole member. The clamp may comprise a lever portion operable, by rotation, to cam the clamp against the telescopic pole member whereby to clamp the telescopic pole member in the extended position relative to the adjacent telescopic pole member. The lever portion may be operable by rotation about an axis of rotation substantially parallel with the longitudinal axis of the elongate pole.

[0013] The sectional profile of each of the mutually engaging surfaces may comprise a first portion having a first curvature and a second portion having a second curvature different from the first curvature. The first portion may be at least half the circumference of the sectional profile.

[0014] The second portion may extend from each end of the first portion. The sectional profile may further comprise a third portion having a third curvature, the third portion being within the second portion. The first curvature may be greater than the second curvature. The first curvature may be less than the third curvature. Thus, the first portion may be more sharply curved than the second portion, but less sharply curved than the third portion. Even where the elongate pole is formed to have a non-smooth surface, it will be understood that the curvature of the elongate pole will be the curvature of the underlying surface and not the curvature of any small-scale features on the surface. [0015] The sectional profile may have a substantially teardrop shape. The sectional profile may comprise one or more substantially straight sections. In examples, the substantially straight section may be provided by the third portion within the second portion. Thus, the sectional profile may be ergonomic.

[0016] The elongate pole may comprise the fluid inlet and the apparatus may further comprise a head connection member pivotably connecting the elongate pole to the head about a pivot axis transverse to a longitudinal direction of the elongate pole. At least a portion of a fluid passageway between the fluid inlet and the fluid outlet may pass within a boundary of the head connection member in a plane transverse to the pivot axis.

[0017] This in itself is believed to be novel and so, in accordance with another aspect of the present invention, there is provided a window cleaning apparatus comprising an elongate pole, the elongate pole comprising a fluid inlet to connect to a source of window cleaning fluid. The apparatus further comprises a head provided at a distal end of the elongate pole and comprising a fluid outlet in fluid communication with the fluid inlet. The apparatus further comprises a head connection member pivotably connecting the elongate pole to the head about a pivot axis transverse to a longitudinal direction of the elongate pole. At least a portion of a fluid passageway between the fluid inlet and the fluid outlet passes within a boundary of the head connection member in a plane transverse to the pivot axis.

[0018] Thus, the fluid passageway may be at least partially protected by the head connection member. The at least a portion of the fluid passageway may pass within the boundary of the head connection member at all pivotable positions of the head relative to the elongate pole.

[0019] The fluid passageway between the fluid inlet and the fluid outlet may be contained within the head connection member. The fluid passageway between the fluid inlet and the fluid outlet may be defined by the head connection member.

[0020] The head connection member may comprise a first member connected to the elongate pole and defining a first portion of the fluid passageway and a second member connected to the head and defining a second portion of the fluid passageway. The first member may be pivotably connected to the second member.

[0021] The head connection member may comprise an adjustable fastener to releasably clamp the first member to the second member. The adjustable fastener may be configured to provide the pivotable connection between the first member and the second member. The adjustable fastener may be a screw fastener, for example a nut and bolt. The adjustable fastener may be a quick release fastener. [0022] At least one of the first member and the second member may comprise a sealing member therebetween, whereby to seal the fluid passageway. The sealing member may be formed from a resilient material, for example neoprene. The sealing member may be formed in a ring.

[0023] The sealing member may be configured to seal the fluid passageway when the adjustable fastener clamps the first member to the second member.

[0024] The first portion of the fluid passageway may comprise a first annular channel around the pivot axis. The second portion of the fluid passageway may comprise a second annular channel around the pivot axis. The first annular channel may be facing and open to the second annular channel.

[0025] Thus, the fluid passageway is integrally formed in the first and second members of the head connection member.

[0026] The apparatus may further comprise a flexible hose providing a fluid passageway between the fluid inlet and the fluid outlet and arranged to extend outwardly past a proximal end of the elongate pole. A proximal end of the elongate pole may be provided with a deforming member comprising a first jaw member and a second jaw member substantially opposing the first jaw member and defining a deforming recess

therebetween. The first jaw member and the second jaw member are shaped to retain a portion of the flexible hose in the deforming recess in a deformed configuration, whereby to substantially prevent fluid flow through the flexible hose.

[0027] This in itself is believed to be novel and so, in accordance with another aspect of the present invention, there is provided a window cleaning apparatus comprising an elongate pole, a fluid inlet connectable to a source of window cleaning fluid, and a head provided at a distal end of the elongate pole, the head comprising a fluid outlet in fluid communication with the fluid inlet. The window cleaning apparatus further comprises a flexible hose providing a fluid passageway between the fluid inlet and the fluid outlet and arranged to extend outwardly past a proximal end of the elongate pole. A proximal end of the elongate pole is provided with a deforming member comprising a first jaw member and a second jaw member substantially opposing the first jaw member and defining a deforming recess therebetween. The first jaw member and the second jaw member are shaped to retain a portion of the flexible hose in the deforming recess in a deformed configuration, whereby to substantially prevent fluid flow through the flexible hose.

[0028] Thus, a fluid flow through the flexible hose can be substantially prevented by crimping the flexible hose within the deforming member. [0029] The deforming member may be a portion of the elongate pole. The first jaw member may be provided by a first side of an open cut-out defined in a proximal end of the elongate pole, and the second jaw member may be provided by a second side of the open cut-out. A separation distance between the first jaw member and second jaw member may be less than half the diameter of the flexible hose, whereby to squash the flexible hose between in the deforming member. The first jaw member and the second jaw member may define a narrowing region therebetween, outwardly of a narrowed region, whereby the flexible hose is deformed from a non-deformed configuration into a deformed configuration on insertion into the narrowed region of the deforming member.

[0030] The head may further comprise a base portion having a base surface from which extend a plurality of bristles each having a tip and at least one tube in fluid communication with the fluid inlet and arranged to extend outwardly from the base surface to a position not extending beyond the tip of the bristles, whereby to provide a fluid outlet away from the base surface of the base portion of the head.

[0031] This in itself is believed to be novel and so, in accordance with another aspect of the present invention, there is provided a window cleaning apparatus comprising an elongate pole, a fluid inlet connectable to a source of window cleaning fluid, and a head provided at a distal end of the elongate pole. The head comprises a base portion having a base surface from which extend a plurality of bristles each having a tip, and at least one tube in fluid communication with the fluid inlet and arranged to extend outwardly from the base surface to a position not extending beyond the tip of the bristles, whereby to provide a fluid outlet away from the base surface of the base portion of the head.

[0032] Thus, window cleaning fluid can be applied to a window to be cleaned away from the base surface of the head, whereby to ensure efficient fluid application onto the surface to be cleaned.

[0033] The tube(s) may be provided within at least some of the plurality of bristles. At least one of the bristles may be hollow. At least one of the bristles may define a

passageway forming the tube therein. Thus, the bristles may provide both a cleaning function and a window cleaning fluid outlet function.

[0034] The at least one tube may be at least two tubes. Each tube may be arranged to extend outwardly to a point at least a third of the way from the base surface to the tip of the bristles. In some embodiments, each tube may be arranged to extend outwardly to a point greater than half way from the base surface to the tip of the bristles. The at least one tube may be flexible. [0035] The position not extending beyond the tip of the bristles may be inwardly of the tip of the bristles.

[0036] A first elongate portion of the elongate pole may be formed from a first material having a first thickness, and a second elongate portion of the elongate pole may be formed from a second material having a second thickness. At least one of the first material and the first thickness may be different from the respective second material and second thickness. The first elongate portion and the second elongate portion may each run from a proximal end of the elongate pole to the distal end of the elongate pole. In some embodiments, the first material may be the same as the second material. In other embodiments, the first thickness may be substantially the same as the second thickness. Thus, the elongate pole can be formed to be stronger along the first or second elongate portions. In some embodiments, the elongate pole can be formed to be stronger in at least one of

compression and tension. The elongate pole can be formed to be stronger in tension on a frontward portion of the elongate member. It will be understood that the frontward portion is the elongate portion of the elongate member arranged to face away from an operator in use. The distal end and the proximal end of the elongate pole may be extensibly connected.

[0037] The head may be rotationally mounted at the distal end of the elongate pole. The head may be rotationally mounted to the head connection member. The head may be configured to be selectively movable between a plurality of rotational positions. The plurality of rotational positions may be a plurality of mutually orthogonal positions. The apparatus may further comprise a head fastener to clamp the head in one rotational position.

[0038] The invention extends to a kit of parts for assembling the window cleaning apparatus as described herein.

[0039] The invention also extends to an adjustable fluid joint connecting a fluid inlet to supply fluid in a first direction to a fluid outlet to output fluid in one amongst a plurality of second directions. The adjustable fluid joint comprises a connection member pivotably connecting the fluid inlet to the fluid outlet about a pivot axis transverse to the first direction. At least a portion of a fluid passageway between the fluid inlet and the fluid outlet passes within a boundary of the connection member in a plane transverse to the pivot axis.

[0040] The fluid passageway between the fluid inlet and the fluid outlet may be contained within the connection member.

[0041] The connection member may comprise a first member connected to the fluid inlet and defining a first portion of the fluid passageway and a second member connected to the fluid outlet and defining a second portion of the fluid passageway. The first member may be pivotably connected to the second member.

[0042] The connection member may comprise an adjustable fastener to releasably clamp the first member to the second member. The adjustable fastener may be a screw fastener, for example a nut and bolt. The adjustable fastener may be a quick release fastener.

[0043] At least one of the first member and the second member may comprise a sealing member therebetween, whereby to seal the fluid passageway. The sealing member may be formed from a resilient material, for example neoprene. The sealing member may be formed in a ring.

[0044] The sealing member may be configured to seal the fluid passageway when the adjustable fastener clamps the first member to the second member.

[0045] The first portion of the fluid passageway may comprise a first annular channel around the pivot axis. The second portion of the fluid passageway may comprise a second annular channel around the pivot axis. The first annular channel may be facing and open to the second annular channel.

[0046] Thus, the fluid passageway is integrally formed in the first and second members of the connection member.

BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Embodiments of the invention are further described hereinafter with reference to the accompanying drawings, in which:

Figure 1 is an illustration of an example of window cleaning apparatus according to the present disclosure;

Figure 2 is an illustration of an elongate pole of the window cleaning apparatus shown in Figure 1 ;

Figure 3 is a diagram showing an example of a fluid joint according to the present disclosure;

Figure 4 is an exploded view of an example of a fluid joint according to the present disclosure;

Figures 5 to 7 are illustrations of the fluid joint shown in Figure 4, assembled and seen from different viewpoints;

Figure 8 is an illustration of an example of a proximal end of the elongate pole of the window cleaning apparatus shown in Figure 1 ; and Figure 9 is a diagram of an example of a head for the window cleaning apparatus according to the present disclosure.

DETAILED DESCRIPTION

[0048] Figure 1 is an illustration of an example of window cleaning apparatus according to the present disclosure. The window cleaning apparatus 100, also called a window cleaning pole is used for cleaning windows or other surfaces of tall buildings. The window cleaning apparatus 100 comprises an elongate pole 102 and is connected to a source of window cleaning fluid through a fluid supply 104. In this example, the elongate pole 102 is formed from a plurality of telescopic pole members 103. The plurality of telescopic pole members 103 is arranged to be telescopically extendable to increase the effective length of the elongate pole 102. The elongate pole 102 is connected at a distal end to a head 106. The head 106 comprises a fluid outlet (not shown) in fluid communication with the fluid supply 104 to supply window cleaning fluid to the head 106 via the elongate pole 102. Thus, the head 106 can be provided at a telescopically extendable distance from a proximal end of the elongate pole 102 by extension of the plurality of telescopic pole members 103. The head 106 also comprises a plurality of bristles 107 facing outwards towards a window to be cleaned in use, and will be described more fully in relation to Figure 9 below. The head 106 is connected to the distal end of the elongate pole 102 via an adjustable fluid joint in the form of a head connection member 108 and a neck member 1 10 connecting the head connection member 108 to the head 106. The head connection member 108 is rotatably adjustable, having an axis of rotation transverse to a longitudinal direction of the elongate pole 102 and parallel to a first side of the window cleaning apparatus, the first side being the side arranged to face the windows to be cleaned in use. The rotational adjustability of the head connection member 108 allows the head 106 to be set at a variable angle relative to the longitudinal direction of the elongate pole 102. This allows the window cleaning apparatus 100 to be used to clean a first window angled at a first angle relative to a ground surface and for the head 106 to be rotationally adjusted for the window cleaning apparatus 100 to be used to clean a second window angled at a second angle relative to the ground surface. For both the first window and the second window, the head 106 is adjustable to always face towards the window, such that the bristles 107 are substantially perpendicular to a surface of the window to be cleaned. In this example, the head connection member 108 is rotationally adjustable to a plurality of predefined rotation amounts. In this example, the head connection member 108 is arranged to be rotatably fixed about an axis of rotation parallel to the longitudinal direction of the elongate pole 102. The head connection member 108 will be described more fully in relation to Figures 3 to 7 below. A deforming member 112 is provided at a proximal end of the elongate pole 102. The deforming member 1 12 will be described more fully with reference to Figure 8 below.

[0049] In this example, the window cleaning apparatus 100 is connected to the fluid supply 104 at the proximal end of the elongate pole 102. Also in this example, an internal fluid tube connecting the fluid supply 104 to the head connection member 108 has a length just over a distance from the head connection member 108 to the proximal end of the elongate pole 102 when the plurality of telescopic pole members 103 is provided in an unextended configuration. In this way, the fluid supply 104 can be easily attached to the internal fluid tube when the window cleaning apparatus 100 is provided in an unextended configuration. As the plurality of telescopic pole members 103 are extended whereby to further space the head 106 from the proximal end of the elongate pole 102, a connection between the fluid supply 104 and the internal fluid tube moves up an internal space of the elongate pole 102. In this way, a substantially constant distance is maintained between the head connection member 108 and the connection between the fluid supply 104 and the internal fluid tube. Thus, the connection may be protected within the elongate pole 102 during deployment and use of the window cleaning apparatus.

[0050] A fluid pathway for fluid from the fluid supply 104 to the head 106 remains entirely within the window cleaning apparatus. In particular, the fluid pathway is within the elongate pole 102, within the head connection member 108 and within the neck member 110. Thus, there is no fluid tubing outside the elongate pole 102, the head connection member 108 or the neck member 110. This avoids any snagging of fluid tubing on external features of a building, which may be possible with some window cleaning apparatus of the prior art.

[0051] In this example, the plurality of telescopic pole members 103 are each formed to have a non-circular cross section, as will be described more fully in relation to Figure 2 below. Thus, the plurality of telescopic pole members 103 are arranged to be rotatably fixed about the longitudinal direction of the elongate pole 102. Thus, the first side of the window cleaning apparatus 100 cannot be changed by mutual rotation of any of the plurality of telescopic pole members 103. As above, the first side is the side of the window cleaning apparatus 100 arranged, in use, to face the window to be cleaned.

[0052] During use, the window cleaning apparatus 100 is arranged to be supported at or near the proximal end of the elongate pole 102 whilst the head connection member 108 is spaced therefrom by extension of the plurality of telescopic pole members 103. Thus, the window cleaning apparatus can be manipulated to clean a window with the head 106, the window located far above an operator. In examples, the window cleaning apparatus may be suitable for cleaning windows on a first, second, third, fourth, fifth, sixth, seventh, eighth or above storey of a building. In this example, the window cleaning apparatus 100 is extendable to reach windows positioned up to 25 metres from the ground.

[0053] The window cleaning fluid is typically water-based, and may include a detergent for enhancing an efficacy of the window cleaning apparatus. It will be understood that in some examples, the fluid supply 104 may comprise a fluid pump (not shown). The fluid pump can apply a sufficient pressure to the window cleaning fluid to urge the window cleaning fluid from a proximal end of the window cleaning apparatus 100 to the head 106 when the plurality of telescopic pole members 103 are partially or fully telescopically extended.

[0054] Figure 2 is an illustration of an elongate pole of the window cleaning apparatus 100 shown in Figure 1. The elongate pole 102 comprises a plurality of telescopic pole members 103a, 103b. It will be understood that Figure 2 shows a cross-section through an innermost (or distal-most) telescopic pole member 103a, but in reality, the innermost telescopic pole member 103a would be connected to the head connection member 108 as described in relation to Figure 1 previously. A distal end of the first outer telescopic pole member 103b is provided with a clamp 1 14a. Further outer telescopic pole members (not shown) are also provided with clamps 1 14b, 1 14c at distal ends thereof. The clamps 1 14a, 1 14b, 1 14c are each operable to move between an engaged configuration and a disengaged configuration. In the engaged configuration, the clamps 114a, 1 14b, 114c are each tightened such that the telescopic pole member 103b, 103a immediately within the telescopic pole member 103b, 103a having the clamp 1 14a, 114b, 1 14c provided at an distal end thereof is clamped in an extensible position relative to the adjacent telescopic pole member. In the disengaged configuration, the clamps 114a, 1 14b, 114c are loosened such that the adjacent telescopic pole member is free to slide telescopically within the clamps 114a, 1 14b, 1 14c. Thus, an extent of the elongate pole 102 may be adjusted using one or more of the clamps 114a, 1 14b, 114c.

[0055] As discussed previously, in this example, each of the telescopic pole members 103a, 103b has a non-circular cross-sectional profile 116 in a plane transverse to the longitudinal direction of the telescopic pole members 103a, 103b. This ensures

substantially no mutual rotation of the telescopic pole members 103a, 103b about the longitudinal direction. In this example, the non-circular cross-sectional profile 116 comprises a first portion having a substantially constant radius of curvature, and a second portion joining the ends of the first portion and having a different radius of curvature. In this example, the first portion extends around substantially half of the cross-sectional profile 116. The second portion may comprise a plurality of regions, each having a different radius of curvature. In one example, the second portion comprises there within a third portion having a further radius of curvature. The radius of curvature of the first portion may be less than a radius of curvature within the second portion. The radius of curvature in the third portion may be less than a radius of curvature in the first portion. In this example, the first side of the window cleaning apparatus 100 includes at least some of the second portion.

[0056] It will be appreciated that each of the telescopic pole members 103a, 103b may have a slightly different cross-sectional profile shape in order to ensure smooth longitudinal sliding between adjacent telescopic pole members. Thus, the cross-sectional profile shape of adjacent telescopic pole members may be different.

[0057] In this example, the telescopic pole members 103a, 103b are formed from carbon fibre. The first portion of the cross-sectional profile 1 16 of the telescopic pole members 103a, 103b may be formed to have a first set of material properties, and the second portion may be formed to have a second set of material properties, the second set of material properties being different from the first set of material properties. In examples, the second portion (which faces at least partially towards the window to be cleaned) may be optimised for tensile strength, whereas the first portion (which faces at least partially away from the window to be cleaned) may be optimised for compressive strength. For example, the first portion may be formed from the same material as the second portion, but may be formed to be thicker than the second portion. In other examples, the first portion and the second portion may be formed from different materials. It will be understood that the term different materials covers materials formed from different proportions of the same constituent materials.

[0058] Figure 3 is a diagram showing an example of a fluid joint according to the present disclosure. The adjustable fluid joint 108 is arranged to provide a fluid pathway for fluid moving between an input tube 1 18 and an output tube 124. The input tube 1 18 may function as a fluid inlet to be connected to the fluid supply 104. The adjustable fluid joint comprises a first housing member 120 and a second housing member 122. The first housing member 120 is pivotably mounted to the second housing member 122 such that the first housing member 120 and the second housing member 122 are rotatable about an axis of rotation transverse to the direction of fluid flow through the adjustable fluid joint 108. The first housing member 120 has a first fluid pathway 121 defined therein. A first end of the first fluid pathway 121 is connected to an end of the input tube 118. A second end of the first fluid pathway 121 , opposite the first end, is in fluid communication with a first end of a second fluid pathway 123 defined within the second housing member 122. The second end of the first fluid pathway 121 and the first end of the second fluid pathway 123 are each formed as a substantially annular opening. In this way, most, if not all, of the second end of the first fluid pathway 121 will overlap with the first end of the second fluid pathway 123 in substantially any rotational position of the first housing member 120 relative to the second housing member 122. In some examples, one or both of the second end of the first fluid pathway 121 and the first end of the second fluid pathway 123 may not be completely annular. The output tube 124 is in fluid communication with a second end of the second fluid pathway 123, within the second housing member 122. Thus, fluid may travel from the input tube 1 18 into the first fluid pathway 121 within the first housing member 120, into the second fluid pathway 123 within the second housing member 122 and into the output tube 124, whilst remaining entirely within the adjustable fluid joint 108. In this example, the adjustable fluid joint 108 further comprises a first member clamp 126 arranged to be operable to clamp the adjustable fluid joint 108 to an uppermost (or distal- most) telescopic pole member (not shown in Figure 3) and a second member clamp 128 arranged to be operable to clamp the adjustable fluid joint 108 to the neck member 110 shown in Figure 1.

[0059] Compared to window cleaning apparatus of the prior art, window cleaning apparatus 100 having the adjustable fluid joint 108 described herein may be safer and more reliable, due to the absence of a fluid pathway provided by an external tubing member passing outside an adjustable joint connecting the elongate member to the head. The angle of the head 106 relative to the elongate pole 102 may be adjusted to suit a range of different window angles as required.

[0060] Figure 4 is an exploded view of an example of a fluid joint according to the present disclosure. As can be seen, the adjustable fluid joint 108 comprises the first housing member 120 having defined therein the first fluid pathway 121. A first housing engaging surface 134 of the first housing member 120 surrounds the second end of the first fluid pathway 121 and is formed to face and engage with a second housing engaging surface 136 of the second housing member 122. The second housing engaging surface 136 surrounds the first end of the second fluid pathway 123 (not shown in Figure 4). The first housing engaging surface 134 and the second housing engaging surface 136 are each formed mutually engaging circumferentially undulating surface. In this way, when the first housing engaging surface 134 is pressed against the second housing engaging surface 136, the circumferentially undulating surfaces engage and substantially prevent mutual rotation of the first and second housing members 120, 122 about an axis of rotation transverse to the fluid flow pathway through the adjustable fluid joint 108. The adjustable fluid joint 108 further comprises a clamp formed by a clamping shaft 130 arranged to extend through the first housing member 120 and the second housing member 122, and secured in place by a clamp fastener 131. In this example, the clamping shaft 130 is a threaded shaft, and the clamp fastener 131 is a threaded fastener. A spring 132 is provided between the first housing member 120 and the second housing member 122 to bias the first housing member 120 away from the second housing member 122 when the clamp is loosened. The clamp provides a quick release fastener, whereby a camming action of a handle portion of the clamping shaft 130 is used to releasably clamp the first housing member 120 to the second housing member 122. The first fluid pathway 121 and the second fluid pathway 123 (not shown in Figure 4) each surround the clamping shaft 130 and are spaced from the clamping shaft 130 by a portion of the respecting first housing member 120 and the second housing member 122. In this way, the fluid passing through the adjustable fluid joint 108 does not contact the clamping shaft 130. In examples, the adjustable fluid joint 108 may comprise a sealing member (not shown), for example formed from rubber, to ensure a watertight seal in the fluid pathway between the first fluid pathway 121 and the second fluid pathway 123 when the adjustable fluid joint 108 is clamped in a rotational position. As described in relation to Figure 3 previously, the adjustable fluid joint 108 further comprises a first member clamp 126 and a second member clamp 128 to clamp the first member 120 and the second member 122 respectively to further elongate poles of the window cleaning apparatus 100.

[0061] Figures 5 to 7 are illustrations of the fluid joint shown in Figure 4, assembled and seen from different viewpoints. The adjustable fluid joint 108 is shown having an angle of approximately 110 degrees. It will be appreciated from Figure 6 at least, that in this example, the adjustable fluid joint 108 is rotatable over a range of approximately 200 degrees, allowing the head 106 of the window cleaning apparatus 100 to be positioned over a large range of rotational positions.

[0062] Figure 8 is an illustration of an example of a proximal end of the elongate pole of the window cleaning apparatus shown in Figure 1. As described in relation to Figure 1 , the elongate pole 102 is provided with the deforming member 112 at the proximal end thereof. In this example, the deforming member 112 is separately mounted to the proximal end of an outermost or proximal-most member in the plurality of telescopic members 103. In some examples, the deforming member 1 12 may be provided by the proximal end of the elongate pole 102. The deforming member 1 12 provides a first jaw member 140a and a second jaw member 140b. The first jaw member 140a and the second jaw member 140b are each located on a side of the elongate pole 102 away from the first side of the window cleaning apparatus 100. In this example, the first jaw member 140a and the second jaw member 140b are located in a side of the elongate pole 102 substantially perpendicular to the first side. The first jaw member 140a and the second jaw member 140b define therebetween a deforming recess 138. In this example, the first jaw member 140a is provided by a first wall of a cut-out in the deforming member 112 and the second jaw member 140b is provided by a second wall of the cut-out in the deforming member 112. The first jaw member 140a and the second jaw member 140b together define a mouth of the deforming recess 138 having a first width and a throat of the deforming recess 138 having a second width less than the first width. In this example, the deforming recess 138 is further defined by a further cut-out portion 142 of the deforming member 1 12. The further cut-out portion 142 extends inwardly from the throat of the deforming recess 138, in a direction away from the mouth of the deforming recess 138. A width of the further cut-out portion 142 is substantially equal to the second width. In some examples, the width of the further cut-out portion 142 may gradually decrease. In this example, the second width is approximately 5 millimetres. In other examples, the second width may be different. The second width is typically the width required to substantially clamp shut a fluid tube 144 connected to the fluid supply 104. The fluid tube 144 connects the fluid supply 104 to the window cleaning apparatus 100. In this example, the first width is approximately 20 millimetres. In other examples, the first width may be different. The first width is typically greater than a diameter of the fluid tube 144. In this example, the outer diameter of the fluid tube 144 is 8 millimetres. The fluid tube 144 is flexible. In this example, the fluid tube is formed from plastics. In this example, a length of the further cut-out portion 142 is approximately 12 millimetres. In other examples, the length may be different. Typically, the length of the further cut-out portion 142 is long enough to clamp an entire cross-section of the fluid tube 144 in a flattened configuration.

[0063] In use, the fluid tube 144 may be inserted into the deforming recess 138. As the fluid tube 144 is moved inwardly within the deforming recess 138, an outer surface of the fluid tube 144 will first be contacted by the first jaw member 140a and the second jaw member 140b. On further insertion of the fluid tube 144 into the deforming recess 138, the fluid tube 144 will be deformed by the narrowing of the deforming recess 138 between the first jaw member 140a and the second jaw member 140b until the fluid tube 144 is fully inserted within the region of the deforming recess 138 defined by the further cut-out portion 142. Thus, the fluid tube 144 can be clamped shut, substantially preventing any flow of fluid through the fluid tube 144. The deforming member 1 12 provides a simple and effective means to temporarily restrict or cut-off flow of window cleaning fluid within the window cleaning apparatus 100. This might be useful, for example, during manipulation of the window cleaning apparatus 100 between different windows or regions of windows to be cleaned. In some examples, the fluid tube 144 may not be fully clamped shut, and the deforming member may only restrict the flow of window cleaning fluid within the window cleaning apparatus 100. [0064] Figure 9 is a diagram of an example of a head for the window cleaning apparatus according to the present disclosure. The head 106 is in fluid communication with the fluid supply 104 via a head inlet tube 150. The head 106 comprises a base portion 146 having a base surface 147. The base surface is located substantially facing a window to be cleaned in use. A plurality of bristles 107 extend from the base surface 147. The plurality of bristles 107 extend from a periphery of the base surface 147. In this example, there are no bristles in a central region of the base surface 147, the central region being within the periphery of the base surface 147. Each of the plurality of bristles is terminated with a tip 152. In this example, a length of each of the bristles in the plurality of bristles 107 is substantially the same. The length of each of the bristles in this example is approximately 50 millimetres. In other examples, a range of bristle lengths may be present in the plurality of bristles 107. The head 106 further comprises at least one fluid outlet tube 148 extending outwardly from the base surface 147. The fluid outlet tube 148 is in fluid communication with the head inlet tube 150. In this example, two fluid outlet tubes 148 are provided. Each fluid outlet tube 148 in this example extends from within the central region of the base surface 147. In this example, the fluid outlet tube 148 is located substantially centrally between an upper row of bristles 107 and a lower row of bristles 107. A length of the fluid outlet tube 148 is not greater than a length of the plurality of bristles 107. In some examples, the length of the outlet tube 148 is less than the length of the plurality of bristles 107. Thus, at least one fluid outlet of the head 106 is provided away from the base surface 147 of the base portion 146 of the head 106. In this way, more of the window cleaning fluid can contact the window to be cleaned in the region between the bristles, instead of running down between the bristles than if the outlet for the window cleaning fluid is provided at the base surface 147.

[0065] In this example, the outlet tube 148 is flexible. Thus, the outlet tube 148 will bend if the head 106 is pressed against the window such that the outlet tube 148 contacts the window. In some examples, the outlet tube may be provided by one or more of the plurality of bristles 107. In some examples, at least 1 % of the plurality of bristles 107 may be outlet tubes for supplying window cleaning fluid to the window to be cleaned.

[0066] It will be understood that when the window cleaning apparatus 100 is used to clean windows above an operator, the proximal end will be the lower end and the distal end will be the upper end.

[0067] In summary, there is provided window cleaning apparatus (100) comprising: an elongate pole (102) comprising a plurality of telescopic pole members (103, 103a, 103b); a fluid inlet (118) to connect to a source of window cleaning fluid; and a head (106) provided at a distal end of the elongate pole (102) and comprising a fluid outlet (148) in fluid communication with the fluid inlet (1 18). A sectional profile (116) of each of mutually engaging surfaces of the plurality of telescopic pole members (103, 103a, 103b) define one of a plurality of non-circular shapes, whereby to substantially prevent mutual rotation of the telescopic members (103, 103a, 103b) around a longitudinal axis of the elongate pole (102).

[0068] Throughout the description and claims of this specification, the words "comprise" and "contain" and variations of them mean "including but not limited to", and they are not intended to (and do not) exclude other components, integers or steps. Throughout the description and claims of this specification, the singular encompasses the plural unless the context otherwise requires. In particular, where the indefinite article is used, the specification is to be understood as contemplating plurality as well as singularity, unless the context requires otherwise.

[0069] Features, integers or characteristics described in conjunction with a particular aspect, embodiment or example of the invention are to be understood to be applicable to any other aspect, embodiment or example described herein unless incompatible therewith. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. The invention is not restricted to the details of any foregoing embodiments. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed. The invention is as defined in the appended claims.

Claims

1. Window cleaning apparatus comprising:

an elongate pole comprising a plurality of telescopic pole members, each telescopic pole member provided with a clamp operable to clamp the telescopic pole member in an extended position relative to an adjacent telescopic pole member;

a fluid inlet to connect to a source of window cleaning fluid; and

a head provided at a distal end of the elongate pole and comprising a fluid outlet in fluid communication with the fluid inlet,

wherein a sectional profile of each of mutually engaging surfaces of the plurality of telescopic pole members define a non-circular shape, whereby to substantially prevent mutual rotation of the telescopic members around a longitudinal axis of the elongate pole.

2. Window cleaning apparatus as claimed in claim 1 , wherein the sectional profile of each of the mutually engaging surfaces comprises a first portion having a first curvature and a second portion having a second curvature different from the first curvature.

3. Window cleaning apparatus as claimed in claim 2, wherein the first portion is at least half the perimeter of the sectional profile.

4. Window cleaning apparatus as claimed in claim 2 or claim 3, wherein the second portion extends from each end of the first portion and wherein the sectional profile further comprises a third portion having a third curvature, the third portion being within the second portion, and wherein the first curvature is greater than the second curvature, and wherein the first curvature is less than the third curvature.

5. Window cleaning apparatus as claimed in claim 4, wherein the sectional profile has a substantially teardrop shape.

6. Window cleaning apparatus as claimed in any preceding claim, wherein the sectional profile comprises one or more substantially straight sections.

7. Window cleaning apparatus as claimed in any preceding claim, wherein the elongate pole comprises the fluid inlet, and wherein the apparatus further comprises a head connection member pivotably connecting the elongate pole to the head about a pivot axis transverse to a longitudinal direction of the elongate pole, wherein at least a portion of a fluid passageway between the fluid inlet and the fluid outlet passes within a boundary of the head connection member in a plane transverse to the pivot axis.

8. Window cleaning apparatus comprising:

an elongate pole comprising a fluid inlet to connect to a source of window cleaning fluid;

a head provided at a distal end of the elongate pole and comprising a fluid outlet in fluid communication with the fluid inlet; and

a head connection member pivotably connecting the elongate pole to the head about a pivot axis transverse to a longitudinal direction of the elongate pole,

wherein at least a portion of a fluid passageway between the fluid inlet and the fluid outlet passes within a boundary of the head connection member in a plane transverse to the pivot axis.

9. Window cleaning apparatus as claimed in claim 6 or claim 7, wherein the fluid passageway between the fluid inlet and the fluid outlet is contained within the head connection member.

10. Window cleaning apparatus as claimed in claim 8, wherein the head connection member comprises a first member connected to the elongate pole and defining a first portion of the fluid passageway and a second member connected to the head and defining a second portion of the fluid passageway, and wherein the first member is pivotably connected to the second member.

1 1. Window cleaning apparatus as claimed in claim 9, wherein the head connection member comprises an adjustable fastener to releasably clamp the first member to the second member.

12. Window cleaning apparatus as claimed in claim 9 or claim 10, wherein at least one of the first member and the second member comprises a sealing member therebetween, whereby to seal the fluid passageway.

13. Window cleaning apparatus as claimed in claim 11 , wherein the sealing member is configured to seal the fluid passageway when the adjustable fastener clamps the first member to the second member.

14. Window cleaning apparatus as claimed in any of claims 9 to 12, wherein the first portion of the fluid passageway comprises a first annular channel around the pivot axis, wherein the second portion of the fluid passageway comprises a second annular channel around the pivot axis, and wherein the first annular channel is facing and open to the second annular channel.

15. Window cleaning apparatus as claimed in any preceding claim, wherein the apparatus further comprises:

a flexible hose providing a fluid passageway between the fluid inlet and the fluid outlet and arranged to extend outwardly past a proximal end of the elongate pole,

wherein a proximal end of the elongate pole is provided with a deforming member comprising a first jaw member and a second jaw member substantially opposing the first jaw member and defining a deforming recess therebetween, wherein the first jaw member and the second jaw member are shaped to retain a portion of the flexible hose in the deforming recess in a deformed configuration, whereby to substantially prevent fluid flow through the flexible hose.

16. Window cleaning apparatus comprising:

an elongate pole;

a fluid inlet connectable to a source of window cleaning fluid;

17. Window cleaning apparatus as claimed in claim 14 or claim 15, wherein the deforming member is a portion of the elongate pole, and wherein the first jaw member is provided by a first side of an open cut-out defined in a proximal end of the elongate pole, and wherein the second jaw member is provided by a second side of the open cut-out.

18. Window cleaning apparatus as claimed in any preceding claim, wherein the head further comprises:

a base portion having a base surface from which extend a plurality of bristles each having a tip; and at least one tube in fluid communication with the fluid inlet and arranged to extend outwardly from the base surface to a position not extending beyond the tip of the bristles, whereby to provide a fluid outlet away from the base surface of the base portion of the head.

19. Window cleaning apparatus comprising:

an elongate pole;

a fluid inlet connectable to a source of window cleaning fluid; and

a head provided at a distal end of the elongate pole and comprising:

a base portion having a base surface from which extend a plurality of bristles each having a tip; and

at least one tube in fluid communication with the fluid inlet and arranged to extend outwardly from the base surface to a position not extending beyond the tip of the bristles, whereby to provide a fluid outlet away from the base surface of the base portion of the head.

20. Window cleaning apparatus as claimed in claim 17 or 18, wherein the at least one tube is at least two tubes, and wherein each tube is arranged to extend outwardly to a point at least a third of the way from the base surface to the tip of the bristles.

21. Window cleaning apparatus as claimed in any of claims 17 to 19, wherein the at least one tube is flexible.

22. Window cleaning apparatus as claimed in any preceding claim, wherein a first elongate portion of the elongate pole is formed from a first material having a first thickness, and wherein a second elongate portion of the elongate pole is formed from a second material having a second thickness, and wherein at least one of the first material and the first thickness is different from the respective second material and second thickness, and wherein the first elongate portion and the second elongate portion each run from a proximal end of the elongate pole to the distal end of the elongate pole.

23. Window cleaning apparatus as claimed in any preceding claim, wherein the head is rotationally mounted at the distal end of the elongate pole.

24. A kit of parts for assembling the window cleaning apparatus as claimed in any preceding claim.

25. An adjustable fluid joint connecting a fluid inlet to supply fluid in a first direction to a fluid outlet to output fluid in one amongst a plurality of second directions, the adjustable fluid joint comprising: a connection member pivotably connecting the fluid inlet to the fluid outlet about an pivot axis transverse to the first direction,

wherein at least a portion of a fluid passageway between the fluid inlet and the fluid outlet passes within a boundary of the connection member in a plane transverse to the pivot axis.

26. The adjustable fluid joint as claimed in claim 24, wherein the fluid passageway between the fluid inlet and the fluid outlet is contained within the connection member.

27. The adjustable fluid joint as claimed in claim 25, wherein the connection member comprises a first member connected to the fluid inlet and defining a first portion of the fluid passageway and a second member connected to the fluid outlet and defining a second portion of the fluid passageway, and wherein the first member is pivotably connected to the second member.

28. Window cleaning apparatus as claimed in claim 26, wherein the connection member comprises an adjustable fastener to releasably clamp the first member to the second member.

29. Window cleaning apparatus as claimed in claim 26 or claim 27, wherein at least one of the first member and the second member comprises a sealing member

therebetween, whereby to seal the fluid passageway.

30. Window cleaning apparatus as claimed in claim 28, wherein the sealing member is configured to seal the fluid passageway when the adjustable fastener clamps the first member to the second member.

31. Window cleaning apparatus as claimed in any of claims 26 to 29, wherein the first portion of the fluid passageway comprises a first annular channel around the pivot axis, wherein the second portion of the fluid passageway comprises a second annular channel around the pivot axis, and wherein the first annular channel is facing and open to the second annular channel.