Pressure cleaning system

Abstract

The invention relates to a pressure cleaning system (10) for cleaning surfaces, comprising a pressure cleaning appliance (12) with a first fastening part (88) and comprising a supplementary unit (14) with a second fastening part (90), wherein the pressure cleaning appliance (12) is releasably fastenable to the supplementary unit (14) by means of the two fastening parts (88, 90). To develop the pressure cleaning system (10) in such a way that it enables the pressure cleaning appliance (12) to be fastened to the supplementary part (14) easily and without play, it is proposed that the two fastening parts (88, 90) are able to be brought into engagement with each other in a fastening direction (16), wherein the first fastening part (88) has two first longitudinal sides (94, 95) spaced apart from each other, and wherein the second fastening part (90) has two second longitudinal sides (96, 97) spaced apart from each other, wherein, in the engagement position of the two fastening parts (88, 90), a respective first longitudinal side (94, 95) produces a form fit with a respective second longitudinal side (96, 97), and wherein the distance between the two first longitudinal sides (88, 90) and the distance between the two second longitudinal sides (96, 97) increases continuously in the fastening direction (16).

Description

[0001] PRESSURE CLEANING SYSTEM

[0002] The invention relates to a pressure cleaning system for cleaning surfaces, comprising a pressure cleaning device with a first fastening part and a supplementary unit with a second fastening part, wherein the pressure cleaning device can be detachably fastened to the supplementary unit by means of the two fastening parts.

[0003] AU 199923696 A1 discloses a pressure cleaning system comprising a pressure cleaning device and an additional unit. The pressure cleaning device is arranged on the top side of the additional unit and can be removably attached to the additional unit by means of a threaded connection. This requires rotating the pressure cleaning device relative to the additional unit. Attaching the pressure cleaning device to the additional unit is therefore complex.

[0004] CN 203591966 U discloses another pressure cleaning system comprising a pressure cleaning device and an additional unit, wherein the pressure cleaning device can be releasably attached to the additional unit. The pressure cleaning device can be aligned with the additional unit using recesses arranged on the additional unit and complementary raised portions arranged on the pressure cleaning device. The pressure cleaning device is secured via a retaining bracket. However, this does not allow for a play-free attachment of the pressure cleaning device.

[0005] The object of the present invention is therefore to further develop a pressure cleaning system of the type mentioned at the outset in such a way that it enables simple and play-free attachment of the pressure cleaning device to the additional unit. This object is achieved according to the invention in a pressure cleaning system of the generic type in that the two fastening parts can be brought into engagement with one another in a fastening direction, wherein the first fastening part has two first longitudinal sides spaced apart from one another, and wherein the second fastening part has two second longitudinal sides spaced apart from one another, wherein in the engaged position of the two fastening parts, a first longitudinal side in each case forms a positive connection with a second longitudinal side, and wherein the distance between the two first longitudinal sides and the distance between the two second longitudinal sides continuously increases in the fastening direction.

[0006] With such a configuration, all that is required to attach the pressure cleaning device to the supplementary unit is to engage the two fastening parts with one another in a fastening direction. To do this, the pressure cleaning device, together with the first fastening part, can be moved in the fastening direction along the second fastening part. The two fastening parts each have two spaced-apart longitudinal sides, wherein in the engaged position of the two fastening parts, i.e. in the position of the two fastening parts in which they are engaged with one another, a first longitudinal side of the first fastening part forms a positive connection with a second longitudinal side of the second fastening part. This allows for simple attachment of the pressure cleaning device to the supplementary unit.

[0007] The distance between the two first longitudinal sides, as well as the distance between the two second longitudinal sides, continuously increases in the fastening direction. The first longitudinal sides of the first fastening part and the second longitudinal sides of the second fastening part are thus each aligned with one another like wedge surfaces, the mutual distance between which continuously increases in the fastening direction. Due to the wedge-like shape, the first and second fastening parts are clamped against one another when the pressure cleaning device assumes its position fastened to the additional unit, in which the two fastening parts engage with one another. This enables the pressure cleaning device to be secured to the additional unit with no play and with precise positioning.

[0008] It can be provided that one of the two fastening parts, for example the second fastening part, can be engaged behind by the other of the two fastening parts, for example the first fastening part.

[0009] The additional unit can, for example, be designed as a container unit having a reservoir for pressurized cleaning fluid. This allows the pressure cleaning device attached to the container unit to be operated without an external supply of cleaning fluid by feeding the cleaning fluid filled into the reservoir of the container unit to an inlet of the pressure cleaning device. A fluid supply line of the container unit can, for example, be detachably connected to the inlet. To enable trouble-free operation, the inlet must be precisely aligned with the fluid supply line. This is easily achieved using the fastening parts. The supplied cleaning fluid from the pressure cleaning device can be pressurized by means of a pump. The pressure can be more than 10 bar, for example 20 bar to 30 bar, in particular 25 bar.The cleaning fluid pressurized by the pressure cleaning device can be discharged from the pressure cleaning device via an outlet. A fluid discharge line, such as a pressure hose, can be connected to the outlet. The cleaning fluid can be fed to a fluid discharge device, in particular a spray gun or spray lance, via the fluid discharge line.

[0010] It is advantageous if the supplementary unit has a device receptacle into which the pressure cleaning device can be inserted in the fastening direction, wherein the second fastening part is arranged in the device receptacle and can be brought into engagement with the first fastening part of the pressure cleaning device when the pressure cleaning device is inserted into the device receptacle. The pressure cleaning device can be inserted into the device receptacle of the supplementary unit and secured there by means of the first fastening part of the pressure cleaning device and the second fastening part arranged in the device receptacle. This enables a particularly compact design of the pressure cleaning system.

[0011] It is advantageous if the first fastening part and the second fastening part each have an upper side relative to an upright use position of the pressure cleaning system, wherein a contact surface is arranged on the upper side of the first fastening part and a support surface is arranged on the upper side of the second fastening part, wherein the contact surface rests on the support surface when the pressure cleaning device is attached to the supplementary unit. The weight of the pressure cleaning device is thus supported by the second fastening part in the upright use position of the pressure cleaning system.

[0012] In a preferred embodiment of the pressure cleaning system according to the invention, one of the two fastening parts, for example the first fastening part, is designed as a recess, and the other of the two fastening parts, for example the second fastening part, is designed as an elevation which, in the fastened position of the pressure cleaning device, dips into the recess.

[0013] Advantageously, the in-depth study is designed to complement the survey.

[0014] If the first fastening part arranged on the pressure cleaning device is designed as a recess, it is advantageous if the recess is open at the bottom relative to the upright use position of the pressure cleaning system. This allows the recess to be placed on the second fastening part, which is preferably designed in the form of a raised portion complementary to the recess and arranged in the device receptacle, when inserting the pressure cleaning device into the device receptacle. It can then be moved in the fastening direction, with the raised portion being received by the recess. This makes attaching the pressure cleaning device to the supplementary unit particularly easy.

[0015] Preferably, at least one first projection is arranged on each of the two first longitudinal sides of the first fastening part, and at least one second projection is arranged on each of the two second longitudinal sides of the second fastening part, wherein the first projection engages behind the second projection when the pressure cleaning device is attached to the supplementary unit. The projections thus interact with each other in a form-fitting manner when the pressure cleaning device is attached to the supplementary unit, so that the pressure cleaning device can be held particularly securely on the supplementary unit.

[0016] For a good load distribution on the first fastening part, it is advantageous if the two first longitudinal sides each have two first projections which are arranged at a distance from one another in the fastening direction.

[0017] For a good load distribution on the second fastening part, it is advantageous if the two second longitudinal sides each have three second projections which are arranged at a distance from one another in the fastening direction.

[0018] Preferably, the pressure cleaning system includes a locking mechanism for locking the pressure cleaning device to the supplementary unit. This minimizes the risk of the pressure cleaning device accidentally becoming detached from the supplementary unit.

[0019] It is advantageous if the locking mechanism has a locking element that can be moved back and forth between a locking position and an unlocking position. The locking element engages a recess in the locking position and releases the recess in the unlocking position. When the pressure cleaning device is in the secured position, the locking element can engage the recess. If the pressure cleaning device is to be detached from the supplementary unit, the locking element can be moved to the unlocking position. The pressure cleaning device can then be detached from the supplementary unit in the opposite direction to the fastening direction.

[0020] It is advantageous if the locking mechanism has an actuating element for moving the locking element from its locking position to its unlocking position against a spring-elastic restoring force.

[0021] In a particularly simple design, the locking element forms a locking lug which engages in the recess in the locking position.

[0022] For easy handling, it is advantageous if the locking element is arranged on the additional unit and the recess is arranged on the pressure cleaning device.

[0023] The following description of a preferred embodiment of the invention serves to explain it in more detail in conjunction with the drawings. They show:

[0024] Figure 1: a perspective view of a pressure cleaning system with a pressure cleaning device and a supplementary unit, obliquely from the front, wherein the pressure cleaning device occupies a position attached to the supplementary unit;

[0025] Figure 2: a perspective view of the pressure cleaning system, obliquely from the front, with the pressure cleaning device positioned at a distance from the supplementary unit; Figure 3: a perspective view of the pressure cleaning system, obliquely from the rear, with the pressure cleaning device positioned at a distance from the supplementary unit;

[0026] Figure 4: a front view of the pressure cleaning system, wherein a battery of the pressure cleaning device is inserted into a battery receptacle of the pressure cleaning device;

[0027] Figure 5: a sectional view of the pressure cleaning system taken along line 5-5 of Figure 4;

[0028] Figure 6: an enlarged view of detail X from Figure 5;

[0029] Figure 7: a sectional view of the pressure cleaning system taken along line 7-7 of Figure 4;

[0030] Figure 8: an enlarged view of detail Y from Figure 7;

[0031] Figure 9: an enlarged view of detail Z from Figure 7.

[0032] Figures 1 to 9 schematically show a preferred embodiment of a pressure cleaning system according to the invention, which is designated overall by the reference numeral 10.

[0033] The pressure cleaning system 10 comprises a pressure cleaning device 12 and a supplementary unit 14, which in the illustrated embodiment is designed as a container unit 15. The pressure cleaning device 12 can be releasably fastened to the container unit 15 in a fastening direction 16. In an upright use position of the pressure cleaning system 10, the fastening direction 16 runs vertically from top to bottom. In the fastened position, the pressure cleaning device 12 is arranged in a device receptacle 18 of the container unit 15, from which it can be removed as needed. In the fastened position, a device longitudinal axis 20 of the pressure cleaning device 12 is aligned parallel to the fastening direction 16.

[0034] The pressure cleaning device 12 comprises a motor 22 and a pump 24. The pump 24 is in flow connection with an inlet 26, shown in Figure 7, through which cleaning fluid to be pressurized can be supplied to the pressure cleaning device 12. The pump 24 pressurizes the cleaning fluid. The pressurized cleaning fluid can be discharged from the pressure cleaning device 12 via an outlet 30 that is in flow connection with the pump 24. A fluid discharge line, for example a pressure hose, which is known per se and is therefore not shown in the drawing for the sake of clarity, can be connected to the outlet 30.

[0035] The container unit 15 comprises a reservoir 32 for pressurized cleaning fluid. The reservoir 32 has a filler neck 36 that can be sealed with a lid 34 to ensure a liquid-tight seal.

[0036] The container unit 15 has a first container side 38 and a second container side 40 opposite the first container side 38. The first container side 38 is inclined obliquely toward the second container side 40. The distance between the first container side 38 and the second container side 40 increases in the fastening direction 16. The device receptacle 18, in which the pressure cleaning device 12 is arranged in its fastened position, is arranged on the first container side 38 of the container unit 15. A region 42 of the pressure cleaning device 12 protrudes from the device receptacle 18 of the container unit 15 in the fastened position of the pressure cleaning device 12.

[0037] The container unit 15 further comprises a first wheel 44 and a second wheel 46, as well as a first base 48 and a second base 50. The wheels 44, 46 are mounted for rotation about a common axis of rotation 47. In the upright position of use, the pressure cleaning system 10, with the wheels 44, 46 and the bases 48, 50, rests on a base not shown in the drawing.

[0038] The container unit 15 has a U-shaped push bar 52. The push bar 52 has a first leg 54 and a second leg 56, which are connected to one another via a web 58. The push bar 52 can be moved back and forth between a retracted position shown in Figures 1 to 4 and 7 and an extended position not shown in the drawing. The first leg 54 is slidably mounted in a first guide channel 60, and the second leg 56 is slidably mounted in a second guide channel 62.

[0039] To move the pressure cleaning system 10, an operator can move the push bar 52 from its retracted position to its extended position and tilt the pressure cleaning system 10 about the pivot axis 47 so that the feet 48, 50 lift off the base. The operator can then transport the pressure cleaning system 10 by moving it on the wheels 44, 46, for example, by pushing or pulling the pressure cleaning system 10 in front of them like a hand truck.

[0040] A recess 66 is arranged on the bottom side 64 of the container unit 15 facing the base. To lift the pressure cleaning system 10, the operator can grasp the web 58 of the push bar 52 in its retracted position with one hand and reach into the recess 66 with the other hand.

[0041] On its second container side 40, the container unit 15 has a storage space 68. The storage space 68 can be used to store accessories. The pressure cleaning device 12 has a device front 76, which, in the attached position of the pressure cleaning device 12, faces away from the second container side 40 of the container unit 15, and a device rear 78 opposite the device front 76. The device front 76 has a lower section 72 and an upper section 74 relative to the upright use position of the pressure cleaning system 10. The device front 76 and the device rear 78 are connected to one another via a first device longitudinal side 80 and a second device longitudinal side 82. In the attached position of the pressure cleaning device 12, the first device longitudinal side 80 and the second device longitudinal side 82 each have a side section 81, 83 protruding from the device receptacle 18 of the container unit 15.Furthermore, the pressure cleaning device 12 has an upper side 84 directed upwards in the upright position of use and a lower side 86 directed downwards.

[0042] For the detachable fastening of the pressure cleaning device 12 to the container unit 15, the pressure cleaning system 10 has a first fastening part 88 and a second fastening part 90, which can be brought into engagement with one another by inserting the pressure cleaning device 12 into the device receptacle 18.

[0043] The first fastening part 88 is arranged on the pressure cleaning device 12 on the rear side 78 and is designed as a recess 89 that is open at the bottom relative to the position of use. This is particularly evident in Figure 3.

[0044] The second fastening part 90 is arranged on the container unit 15 on a rear wall 92 of the device receptacle 18 and is designed as a raised portion 91. In the fastened position of the pressure cleaning device 12, the device rear side 78 faces the rear wall 92 of the device receptacle 18 of the container unit 15. The first fastening part 88 has two spaced-apart first longitudinal sides 94, 95. The distance between the two first longitudinal sides 94, 95 increases continuously in the fastening direction 16, i.e., the distance is smaller at the upper end of the fastening part 88 than at the lower end. The first longitudinal sides 94, 95 are thus aligned with one another like wedge surfaces.

[0045] The second fastening part 90 has two second longitudinal sides 96, 97 spaced apart from one another. The distance between the two second longitudinal sides 96, 97 also increases continuously in the fastening direction 16, so that the distance at the upper end of the second fastening part 90 is smaller than at the lower end. The second longitudinal sides 96, 97 are thus also aligned with one another in the manner of wedge surfaces.

[0046] On the first longitudinal sides 94, 95, two first projections 98, 99 are arranged at a distance from one another in the fastening direction 16. On the second longitudinal sides 96, 97, three second projections 100, 101, 102 are arranged at a distance from one another in the fastening direction 16. In the fastened position of the pressure cleaning device 12, the first projections 98, 99 engage behind the second projections 100, 101, 102, so that the pressure cleaning device 12 is held stably in the device receptacle 18 of the container unit 15. Thus, a first longitudinal side 94, 95 of the first fastening part 88 forms a positive connection with a second longitudinal side 96 or 97 of the second fastening part 90 when the two fastening parts 88, 90 are in engagement with one another, i.e., when they assume their engaged position. This is particularly clear from Figure 6.

[0047] The first fastening part 88 has a contact surface 104 on a side 103 that is upper relative to the upright use position of the pressure cleaning system 10. The second fastening part 90 has a support surface 106 on a side 105 that is upper relative to the upright use position of the pressure cleaning system 10. In the secured position of the pressure cleaning device 12, the contact surface 104 rests on the support surface 106. The weight of the pressure cleaning device 12 is thus held in the upright use position of the pressure cleaning system 10 by the first fastening part 88 and the second fastening part 90. The load on a base 108 of the device holder 18 can be kept low.

[0048] To lock the pressure cleaning device 12 to the container unit 15, the pressure cleaning system 10 has a locking mechanism 110 with a locking element 112 that can be moved back and forth between a locking position and an unlocking position. The locking element 112 is arranged on the container unit 15 and forms a detent 114, which, in the locking position, engages in a recess 116 arranged on the rear side 78 of the pressure cleaning device 12. The locking element 112 can be moved from its locking position to its unlocking position by means of an actuating member 118, counter to a restoring force exerted by a spring 120.

[0049] The pressure cleaning device 12 has a handle 122 arranged on the protruding area 42 on the front side 76 of the device. To insert the pressure cleaning device 12 into the device receptacle 18 of the container unit 15, the operator can grasp the handle 122 and insert the pressure cleaning device 12 in the fastening direction 16 into the device receptacle 18 of the container unit 15, wherein the two fastening parts 88 and 90 are brought into engagement with one another and interact in such a way that the pressure cleaning device 12 is positioned and fastened to the container unit 15 without play. During the insertion process of the pressure cleaning device 12 into the device receptacle 18, the locking lug 114 of the locking element 112 is pressed from the rear side 78 of the device in the direction of the second container side 40 against the restoring force exerted by the spring 120.Once the pressure cleaning device 12 is fully inserted into the device receptacle 18, the locking lug 114 of the locking element 112 engages the recess 116. To remove the pressure cleaning device 12 from the device receptacle 18, the operator can grasp the handle 122. They can then actuate the actuating member 118 of the locking element 112 to move the locking element 112 from its locking position to its unlocking position. They can now remove the pressure cleaning device 12 from the container unit 15 in the opposite direction to the fastening direction 16 of the device receptacle 18, disengaging the two fastening parts 88 and 90 from each other.

[0050] The attachment of the pressure cleaning device 12 to the container unit 15 is therefore very simple and does not require the use of any tools.

[0051] With respect to the upright position of use of the pressure cleaning system 10, a switch 123 for switching the pressure cleaning device 12 on and off is arranged above the handle 122.

[0052] The inlet 26 is located on the underside 86 of the pressure cleaning device 12. Adjoining the inlet 26 is a connecting element 124 designed as a nipple, which can be detachably connected to a fluid supply line 125 of the container unit 15 that extends into the reservoir 32. For this purpose, the connecting element 124, in the mounted position of the pressure cleaning device 12, extends into a connecting element 126 with a sealing ring interposed therebetween. The connecting element 126 has a valve 127.When the pressure cleaning device 12 is inserted into the device receptacle 18, the connecting element 124, designed as a nipple, engages the connecting element 126 and actuates the valve 127 against a restoring force exerted by a valve spring 129, so that the valve 127 assumes an open position and a flow connection between the liquid supply line 125 and the inlet 26 is released. This is particularly clear from Figure 9. When the pressure cleaning device 12 is removed from the device receptacle 18, the valve 127 moves from its open position to a closed position under the influence of the restoring force exerted by the valve spring 129, so that the flow connection between the liquid supply line 125 and the inlet 26 is interrupted and no cleaning liquid can escape from the reservoir 32.The exact positioning of the connecting element 124 relative to the connecting element 126 is ensured by the interaction of the first fastening part 88 with the second fastening part 90.

[0053] The outlet 30 is arranged on the area 42 protruding from the device holder 18 in the mounted position of the pressure cleaning device 12, on the lower section 72 of the front side 76 of the pressure cleaning device 12. For example, a pressure hose can be connected to the outlet 30, via which cleaning fluid can be supplied to a fluid dispensing device known per se and therefore not shown for reasons of clarity, such as a spray gun or a spray lance.

[0054] A first accessory holder 94 is arranged on the side section 81 of the first longitudinal side 80 of the pressure cleaning device 12, which protrudes in the secured position of the pressure cleaning device 12, and a second accessory holder 95 is arranged on the side section 83 of the second longitudinal side 82 of the pressure cleaning device 12, which protrudes in the secured position of the pressure cleaning device 12. Accessories, such as a spray lance and / or a spray gun, can be held on the accessory holders 94, 95.

[0055] In the mounted position of the pressure cleaning device 12, a first recess 132 is arranged on the first container side 38 of the container unit 15 below the first accessory holder 128, and a second recess 134 is arranged below the second accessory holder 130. The accessories arranged on the accessory holders 128, 130 can each be supported on the bottoms 136, 138 of the recesses 132, 134. A battery 140 for supplying power to the motor 22 can be removably inserted into a battery receptacle 142. The battery receptacle 142 is arranged on the upper section 74 on the top side 84 of the pressure cleaning device 12.

[0056] To operate the pressure cleaning system 10, the operator can first fill cleaning fluid, for example water, into the container 32 via the filler neck 36. To move the pressure cleaning system 10 to a location, the operator can move the push handle 52 from its retracted position to its extended position, then tilt the pressure cleaning system 10 about the rotation axis 47 so that the feet 48, 50 lift off the base, and pull the pressure cleaning system 10 behind them on the wheels 44, 46, for example. Once at the location, the operator can transfer the pressure cleaning system 10 to its upright position of use. The operator can now connect a pressure hose, which is stored, for example, in the storage space 68, to the outlet 30. Accessories such as a spray gun and a spray lance, which can be arranged on the accessory holders 128, 130 for transport, can be connected to the pressure hose.For cleaning surfaces or objects in particular, the cleaning fluid is supplied from the reservoir 32 via the fluid supply line 125 through the inlet 26 of the pump 24. The pump 24 pressurizes the cleaning fluid. The cleaning fluid can be dispensed onto the surface or object to be cleaned via the outlet 30 and the connected pressure hose and a fluid dispensing device, in particular a spray gun or a spray lance. Cleaning can continue as long as there is cleaning fluid in the reservoir 32. If further cleaning is required, cleaning fluid can be refilled into the reservoir 32.

[0057] However, it is also possible to operate the pressure cleaning device 12 with an external supply of cleaning fluid. To do so, the operator can remove the pressure cleaning device 12 from the device holder 18. To do so, they can grasp the pressure cleaning device 12 by the handle 102. They can then actuate the actuating member 118 of the locking element 112 to move the locking element 112 from its locking position to its unlocking position. They can now remove the pressure cleaning device 12 from the container unit 15 in the opposite direction to the fastening direction 16 of the device holder 18. An external fluid supply line, for example a suction hose or a garden hose, can then be connected to the inlet 26.The cleaning fluid supplied to the pump 24 is pressurized and can in turn be delivered to a surface to be cleaned or to an object to be cleaned via a pressure hose connected to the outlet 30 and a fluid delivery device connected to the pressure hose, in particular a spray gun or a spray lance.

Claims

PATENT CLAIMS Pressure cleaning system for cleaning surfaces, comprising a pressure cleaning device (12) with a first fastening part (88) and a supplementary unit (14) with a second fastening part (90), wherein the pressure cleaning device (12) can be detachably fastened to the supplementary unit (14) by means of the two fastening parts (88, 90), characterized in that the two fastening parts (88, 90) can be brought into engagement with one another in a fastening direction (16), wherein the first fastening part (88) has two first longitudinal sides (94, 95) spaced apart from one another, and wherein the second fastening part (90) has two second longitudinal sides (96, 97) spaced apart from one another, wherein in the engaged position of the two fastening parts (88, 90) a first longitudinal side (94, 95) forms a positive connection with a second longitudinal side (96, 97), and wherein the distance between the two first Long sides (88,90) and the distance between the two second longitudinal sides (96, 97) increases continuously in the fastening direction (16). Pressure cleaning system according to claim 1, characterized in that one of the two fastening parts (88, 90) can be engaged behind by the other of the two fastening parts (88, 90). Pressure cleaning system according to claim 1 or 2, characterized in that the supplementary unit (14) is designed as a container unit (15) which has a storage container (32) for cleaning fluid to be pressurized. Pressure cleaning system according to claim 1, 2 or 3, characterized in that the supplementary unit (14) has a device receptacle (18) into which the pressure cleaning device (12) can be inserted in the fastening direction (16), wherein the second fastening part (90) in the, Device receptacle (32) is arranged and can be brought into engagement with the first fastening part (88) of the pressure cleaning device (12) when the pressure cleaning device (12) is inserted into the device receptacle (18). Pressure cleaning system according to one of the preceding claims, characterized in that the first fastening part (88) and the second fastening part (90) each have an upper side (103, 105) with respect to a standing position of use of the pressure cleaning system (10), wherein a contact surface (104) is arranged on the upper side (103) of the first fastening part (88) and wherein a support surface (106) is arranged on the upper side (105) of the second fastening part (90), wherein the contact surface (104) is supported on the support surface (106) in the fastened position of the pressure cleaning device (12).Pressure cleaning system according to one of the preceding claims, characterized in that one of the two fastening parts (88, 90) is designed as a recess (89), and in that the other of the two fastening parts (88, 90) is designed as a projection (91) which, in the fastened position of the pressure cleaning device (12), dips into the recess (89). Pressure cleaning system according to claim 6, characterized in that the first fastening part (88) is designed as a recess (89), wherein the recess (89) is open downwards with respect to the upright use position of the pressure cleaning system (10). Pressure cleaning system according to one of the preceding claims, characterized in that at least one first projection (98, 99) is arranged on each of the two first longitudinal sides (94, 95), and in that at least one second projection (100, 101, 102) is arranged on each of the two second longitudinal sides (96, 97), wherein the. The first projection (98, 99) engages behind the second projection (110, 101, 102) in the fastened position of the pressure cleaning device (12). Pressure cleaning system according to claim 8, characterized in that the two first longitudinal sides (94, 95) each have two first projections (98, 99) that are arranged at a distance from one another in the fastening direction (16). The pressure cleaning system according to claim 8 or 9, characterized in that the two second longitudinal sides (96, 97) each have three second projections (100, 101, 102) that are arranged at a distance from one another in the fastening direction (16). Pressure cleaning system according to one of the preceding claims, characterized in that the pressure cleaning system (10) has a locking mechanism (110) for locking the pressure cleaning device (12) to the supplementary unit (14).Pressure cleaning system according to claim 11, characterized in that the locking mechanism (110) has a locking element (112) that can be moved back and forth between a locking position and an unlocking position, which engages in a recess (116) in the locking position and releases the recess (116) in the unlocking position. Pressure cleaning system according to claim 12, characterized in that the locking element (112) forms a detent (114). Pressure cleaning system according to claim 12 or 13, characterized in that the locking element (112) is arranged on the supplementary unit (14), and that the recess (116) is arranged on the pressure cleaning device (12).

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