Patent Publication Number: US-2021187562-A1

Title: Heatable high pressure cleaning appliance

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of international application number PCT/EP2019/072518 filed on Aug. 22, 2019, and claims the benefit of German application number 10 2018 122 145.2 filed on Sep. 11, 2018, which applications are incorporated herein by reference in their entirety and for all purposes. 
    
    
     BACKGROUND OF THE INVENTION 
     The invention relates to a heatable high pressure cleaning appliance with an undercarriage on which a plurality of wheels are rotatably mounted, and with a housing lower part, arranged on the undercarriage, in which a motor and a pump driven by the motor for pressurizing water are arranged, and with a fuel-operated heat exchanger for heating the water and a fuel tank for storing liquid fuel for the heat exchanger. 
     Using heatable high pressure cleaning appliances, water can be pressurized by means of a pump and be heated by means of a heatable heat exchanger. The heated and pressurized water can be directed at an object to be cleaned. The heat exchanger is typically operated using a liquid fuel, for example heating oil or diesel fuel, and may comprise a coiled tubing which is heated by a burner and through which the water is conducted. The liquid fuel for operating the heat exchanger is stored in a fuel tank. Heatable high pressure cleaning appliances of that kind are known e.g. from WO 2012/119641 A2. 
     Heatable high pressure cleaning appliances of the kind being discussed here are used, among other things, on construction sites and other rough environmental conditions and should therefore have a high mechanical stability. In addition, the high pressure cleaning appliances should be producible as cost-effectively as possible. 
     In accordance with an embodiment of the invention, a heatable high pressure cleaning appliance of the kind stated at the outset is provided, which has high mechanical stability and is producible in a cost-effective manner. 
     SUMMARY OF THE INVENTION 
     In accordance with an embodiment of the invention, a heatable high pressure cleaning appliance of the generic type is provided, in which the fuel tank is configured as a one-piece plastic hollow body, which forms the housing lower part and is held on a rigid support frame, wherein the support frame forms a shock protector that at least partially surrounds the fuel tank in the circumferential direction. 
     The heatable high pressure cleaning appliance in accordance with the invention is distinguished, among other things, by the use of a fuel tank, which not only performs the function of storing liquid fuel, but which also forms the housing lower part, in which the motor and the pump driven by the motor are arranged. The fuel tank is configured as a one-piece plastic hollow body and thus has an internal volume for accommodating liquid fuel, for example for accommodating heating oil or diesel fuel. The fuel tank is configured as a seamless hollow body. This gives the fuel tank a significant mechanical stability. The configuration of the fuel tank in the form of a one-piece plastic hollow body also makes it possible to produce the fuel tank in a cost-effective manner. 
     In order to further increase the mechanical stability of the high pressure cleaning appliance in accordance with the invention, the fuel tank configured as a one-piece plastic hollow body is held on a rigid support frame. The support frame has the function, for one, of supporting the fuel tank and, for another, it forms a shock protector for the fuel tank, at least partially surrounding the fuel tank in the circumferential direction and thereby protecting same from shocks in the case of an accidental impact against an obstacle. 
     It is favorable if the support frame completely surrounds the fuel tank in the circumferential direction. 
     It is particularly favorable if the support frame forms the undercarriage of the heatable high pressure cleaning appliance. Preferably at least two wheels are mounted on the undercarriage so as to be rotatable about a common rotational axis. 
     In addition, at least one steering roller is favorably rotatably mounted on the undercarriage. 
     It is advantageous if the support frame projects beyond a front side and a rear side of the fuel tank in relation to a main movement direction. When the high pressure cleaning appliance travels in the main movement direction or counter to the main movement direction and hereby impacts an obstacle, the associated shock load is absorbed by the support frame, which projects beyond the front side and beyond the rear side of the fuel tank. 
     The heat exchanger is preferably arranged behind the fuel tank in relation to the main movement direction of the high pressure cleaning appliance and the support frame projects counter to the main movement direction beyond the heat exchanger. 
     The support frame preferably also forms a shock protector for the heat exchanger by also at least partially surrounding the heat exchanger in the circumferential direction. 
     It is particularly advantageous if the support frame projects transversely to the main movement direction of the high pressure cleaning appliance beyond a first longitudinal side and a second longitudinal side of the fuel tank. It is thereby ensured that even when the high pressure cleaning appliance impacts an obstacle from the side, the mechanical load associated therewith is absorbed by the support frame. 
     In an advantageous embodiment of the invention, the support frame comprises two rigid side frame parts, which are arranged on mutually opposing longitudinal sides of the fuel tank The rigid side frame parts give the support frame a particularly high mechanical stability and protect the fuel tank from mechanical loads that act on the high pressure cleaning appliance in the region of the longitudinal sides of the fuel tank. 
     The side frame parts are preferably each configured as self-contained support frame side portions. The self-contained configuration of the support frame side portions gives the support frame a particularly high mechanical stability in the region of the side frame parts. 
     The self-contained support frame side portions may, for example, extend along the entire periphery of a preferably planar geometric figure, in particular along the perimeter of a circle, oval, or polygon, especially a polygon with rounded corners. 
     It is advantageous if a covering that covers a face side of the pump is removably held at least on a side frame part. By way of the removable covering, for example, a service technician obtains easy access to a face side of the pump in order to perform service on the pump. 
     The removable covering may be configured in the form of a flat material, in particular in the form of a metal sheet, preferably in the form of a perforated metal sheet. 
     The covering is preferably screwed or releasably latched to the side frame part. 
     It is favorable if an opening is arranged between the side frame part and the covering, because the user can obtain access to the face side of the pump by way of the opening without having to necessarily remove the covering from the side frame part. This makes it easier for the user to, for example, perform adjustments on the face side of the pump, in particular to adjust the output pressure of the water pressurized by the pump, or for example to fill a refill container with a descaling solution. 
     In an advantageous embodiment of the invention, the support frame comprises a rigid front frame part, which is arranged on the front side of the fuel tank. 
     In an advantageous embodiment of the invention, the front frame part is configured as a U-shaped support frame front portion. 
     Provision may be made for the support frame to comprise a rigid base frame part, which forms the undercarriage of the high pressure cleaning appliance. For example at least two wheels and additionally at least one steering roller may be rotatably mounted on the rigid base frame part. 
     The base frame part is preferably configured as a U-shaped support frame base portion. It is hereby favorable if the support frame base portion comprises two legs oriented in parallel to the main movement direction of the high pressure cleaning appliance, said legs being connected to one another by way of a web oriented transversely to the main movement direction of the high pressure cleaning appliance and the free ends of which facing away from the web are connected to one another by way of a traverse. The traverse may, for example, be configured in the form of a metal sheet. 
     In an advantageous embodiment of the invention, the support frame comprises at least one rigid rear frame part, which projects beyond the rear side of the fuel tank and forms a grip of the high pressure cleaning appliance. The user can guide the high pressure cleaning appliance using the grip. 
     The at least one rear frame part preferably also projects beyond the rear side of the heat exchanger, assuming said heat exchanger is arranged behind the fuel tank in relation to the main movement direction of the high pressure cleaning appliance. 
     It is particularly advantageous if the support frame comprises two rigid rear frame parts, which are arranged at a distance from one another and project beyond the rear side of the fuel tank and preferably also beyond the rear side of the fuel tank and each form a grip of the high pressure cleaning appliance. 
     At least one rigid rear frame part is preferably of stirrup-shaped configuration. 
     It is particularly advantageous if the at least one rigid rear frame part is rigidly connected to a side frame part of the support frame. In particular, provision may be made for the at least one rear frame part to be welded to a side frame part. 
     As already mentioned, the heatable high pressure cleaning appliance in accordance with the invention may be used, in particular, on construction sites. It may hereby be necessary to lift the high pressure cleaning appliance using a lifting device, for example using a crane. In a particularly preferable embodiment of the high pressure cleaning appliance in accordance with the invention, the support frame comprises a rigid attachment frame part for attaching a crane hook or a lifting strap. The crane hook or lifting strap can thus engage directly on the rigid attachment frame part of the support frame in order to lift the entire high pressure cleaning appliance. A mechanical load on the fuel tank when lifting the high pressure cleaning appliance is thereby avoided. 
     The attachment frame part favorably engages over the fuel tank. For example, it may extend from a first rigid side frame part of the support frame that is arranged on a first longitudinal side of the fuel tank to a second rigid side frame part of the support frame that is positioned on the opposite second longitudinal side of the fuel tank. 
     The attachment frame part of the support frame is arranged between the motor and the fuel tank in relation to the main movement direction of the high pressure cleaning appliance. 
     In order to prevent unintentional movement of the crane hook or the lifting strap relative to the attachment frame part, the attachment frame part preferably comprises two support frame attachment portions, which are oriented at an angle to one another and are rigidly connected to one another. The crane hook can be positioned in the connecting region between the two support frame attachment portions arranged at an angle to one another. 
     The two support frame attachment portions are favorably aligned at an obtuse angle to one another, for example at an angle of 150° to 175°. 
     The support frame preferably consists of metal, because this gives the support frame a particularly high mechanical stability. 
     In an advantageous embodiment of the invention, the support frame comprises a plurality of a bent pipes that are rigidly connected to one another. In particular, provision may be made for the support frame to be configured in the form of a pipe frame. In an embodiment of that kind, the support frame forms a supporting metal structure that consists of pipes that are rigidly connected to one another, in particular welded to one another. 
     Steel is preferably used for the production of the support frame. 
     It is advantageous if the support frame comprises a base plate on which the heat exchanger is arranged. The base plate preferably consists of metal. 
     As mentioned at the outset, the fuel tank configured as a seamless plastic hollow body forms the housing lower part, in which the motor and the pump are arranged. It is advantageous if the fuel tank forms a motor receiving part, into which the motor is insertable and which comprises supporting bodies for supporting the motor. 
     The supporting bodies are preferably of hollow configuration. 
     Provision may be made, for example, for the motor to comprise a housing, from which a plurality of holding arms protrude, which each can be supported by a supporting body of the motor receiving part. 
     It is particularly favorable if the motor receiving part comprises a through-duct, which is molded into the fuel tank and extends from a top side to a bottom side of the fuel tank. The motor may cover the through-duct, wherein the through-duct enables a circulation of air, which surrounds the motor and dissipates heat from the motor. 
     In order to be able to supply water to the high pressure cleaning appliance that is pressurized by the pump, the high pressure cleaning appliance can be connected e.g. to a public water supply network. In the case of such a connection to a public water supply network, the network operator often requires that it be ensured by means of appropriate measures that water taken from the water supply network cannot unintentionally be returned to the water supply network. This is to ensure that the water supply network cannot come into contact with water that is possibly contaminated. In order to fulfill this requirement, the high pressure cleaning appliance in accordance with the invention comprises, in a preferred embodiment, a decoupling tank with an inlet that can be connected to a water supply network and with an outlet that is in flow connection with the pump. Water taken from the water supply network can first flow into the decoupling tank and then to the pump. The inlet of the decoupling tank is favorably arranged on the top side thereof, such that water from the water supply network is able to enter the decoupling tank, but it is not possible for the water to readily return from the decoupling tank back into the water supply network. 
     It is particularly advantageous if the fuel tank configured as a one-piece plastic hollow body comprises a recess that forms the decoupling tank which forms the decoupling tank that comprises an inlet connectable to a water supply network and that is in flow connection with the pump. 
     The recess may, for example, be configured in the form of a pocket. 
     A fill level-dependent valve, for example a float valve, is preferably arranged at the inlet of the decoupling tank. By means of the fill level-dependent valve, it can be ensured in a constructively simple manner that the decoupling tank does not overflow. Rather, the fill level-dependent valve closes and interrupts the connection from the water supply network to the decoupling tank when the fill level of the decoupling tank reaches a maximum level. 
     For increasing a particularly good cleaning effect, provision may be made for a liquid cleaning agent that is stored in a cleaning agent tank to be admixed to the water. 
     The fuel tank of the heatable high pressure cleaning appliance in accordance with the invention favorably forms a multi-functional part that, for one, serves to store liquid fuel and, for another, gives the high pressure cleaning appliance a significant mechanical stability and that, moreover, forms the housing lower part, which accommodates the motor and the pump and preferably also a blower driven by the motor, wherein air can be supplied to the heat exchanger by means of the blower. Moreover, the fuel tank may comprise a preferably pocket-shaped recess, which forms a decoupling tank. The fuel tank configured as a multi-functional part may also form a motor receiving part, into which the motor is insertable. 
     The configuration of the fuel tank as a multi-functional component makes it possible to significantly reduce the production costs of the high pressure cleaning appliance. Moreover, the provision of recesses also has the advantage that the fuel tank has a high mechanical strength. 
     The fuel tank is favorably produced by rotational molding. This production method enables a particularly robust configuration of the fuel tank. The fuel tank produced by rotational molding can be produced in one single operation. Impact resistant plastics may hereby be used, such that a fuel tank can be produced that is particularly mechanically resistant. 
     In addition to a housing lower part that is formed by the fuel tank, in an advantageous embodiment, the heatable high pressure cleaning appliance in accordance with the invention comprises a housing upper part that is arranged on the housing lower part. 
     The housing upper part may be configured e.g. in the form of a hood that covers the housing lower part. 
     The housing upper part is favorably configured as a one-piece, in particular closed plastic hollow body. This gives the housing upper part a high mechanical strength. 
     The housing upper part is preferably produced by rotational molding. As explained above, by means of a production method of that kind, a component that is particularly mechanically resistant can be produced in a cost-effective manner. 
     As already mentioned, it is favorable if the rigid support frame on which the fuel tank is held comprises an attachment frame part for attaching a crane hook or a lifting strap. It is advantageous if the housing upper part comprises a through-channel that extends from a top side of the housing upper part to a bottom side of the housing upper part, wherein the attachment frame part of the support frame is accessible to the user by way of the through-channel. In that kind of an embodiment of the invention, the user is able to pass, for example, a crane hook or a lifting strap through the through-channel of the housing upper part in order to fix the crane hook or the lifting strap on the attachment frame part of the support frame. The handling of the high pressure cleaning appliance during the transport thereof by means of a lifting device is thereby simplified. 
     A further simplification of the handling of the high pressure cleaning appliance is achieved in an advantageous embodiment of the invention in that the housing upper part forms at least one hook for wrapping up a hose and/or an electrical cable. For example, a pressure hose and/or an electrical supply cable can be wrapped on a hook formed by the housing upper part. 
     The subsequent description of a preferable embodiment of the invention serves in conjunction with the drawing for further explanation. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a perspective depiction of a heatable high pressure cleaning appliance obliquely from behind; 
         FIG. 2  shows a perspective depiction of the high pressure cleaning appliance from  FIG. 1  obliquely from the front; 
         FIG. 3  shows a plan view of the high pressure cleaning appliance from  FIG. 1 ; 
         FIG. 4  shows a perspective depiction of a housing lower part of the high pressure cleaning appliance from  FIG. 1  in the form of a fuel tank; 
         FIG. 5  shows a perspective depiction of the fuel tank from  FIG. 4  with a motor that is inserted in a motor receiving part of the fuel tank; 
         FIG. 6  shows a perspective depiction of a housing upper part of the high pressure cleaning appliance from  FIG. 1 ; 
         FIG. 7  shows a perspective depiction of a support frame of the high pressure cleaning appliance from  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Schematically depicted in the drawing is an advantageous embodiment of a heatable high pressure cleaning appliance in accordance with the invention, which is designated as a whole with the reference numeral  10 . The high pressure cleaning appliance  10  comprises a housing lower part  12  as well as a housing upper part  14  that is arranged on the housing lower part  12  and covers same. 
     The high pressure cleaning appliance  10  is configured to be able to move. For this purpose, it comprises two wheels  16 ,  18  as well as two steering rollers  20 ,  22 . The wheels  16 ,  18  and the steering rollers  20 ,  22  are rotatably mounded on an undercarriage  24 . A main movement direction of the high pressure cleaning appliance  10  is indicated in  FIGS. 1, 2 and 3  by the arrow  26 . 
     A heatable heat exchanger  28  that is positioned on a base plate  30  is arranged on the undercarriage  24  behind the housing lower part  12  in the main movement direction  26 . 
     The housing lower part  12  is formed by a fuel tank  32  that is configured as a one-piece plastic hollow body and can be filled with liquid fuel, in particular with heating oil or with diesel fuel, by way of a fill opening  34  for operating the heat exchanger  28 . The fill opening  34  is arranged on a front side  36  of the fuel tank  32  and is closeable by means of a hinged lid  40 . 
     In the embodiment depicted, the fuel tank  32  is made from a plastic material by means of rotational molding. It forms a seamless hollow body, the internal volume of which accommodates the liquid fuel. 
     As can be seen in particular in  FIGS. 4 and 5 , the fuel tank  32  forms, among other things, a motor receiving part  42 , which comprises a through-duct  44  that extends from a top side  46  of the fuel tank  32  to a bottom side  48  of the fuel tank  32 . 
     On its top side, the motor receiving part  42  comprises hollow supporting bodies  50 ,  52 ,  54 ,  56 , which are arranged substantially at the corner points of the passage shaft  44  that is rectangular in plan view and each comprise a concave support face  58 ,  60 ,  62 ,  64 . In each case a free end portion of a holding arm  66 ,  68 ,  70 ,  72  that projects outwardly from a motor housing  74  of an electric motor  76  can be positioned on the support faces  58 ,  60 ,  62 ,  64 . The electric motor  76  can be inserted into the motor receiving part  42 , covering the through-duct  44  and being supported by the supporting bodies  50 ,  52 ,  54 ,  56 . A flow of air through the through duct  44  can form to cool the electric motor  76 . 
     The electric motor  76  bears on a first motor end  78  a pump  80 , which projects out of the motor receiving part  42  on a first longitudinal side  81  of the fuel tank  32 , and on a second motor end  82  the electric motor  76  bears a blower  84 , which projects out of the motor receiving part  42  on a second longitudinal side  85  of the fuel tank  32  that faces away from the first longitudinal side  81 . By means of the pump  80 , water can be pressurized, which can be directed at an object to be cleaned, and by means of the blower  84 , air can be supplied to the heat exchanger  28 . The heat exchanger may, as is typical, comprise a coiled tubing, which is heated by a burner and through which the water pressurized by the pump  80  is conducted in order to heat the water. In the region between the motor receiving part  42  and the front side  36 , the fuel tank  32  configured as a seamless hollow body forms a pocket-shaped recess  86 . The recess  86  forms a decoupling tank  90  that comprises on its top side  92  an inlet  94  at which a fill level-dependent valve in the form of a float valve  96  is arranged. The decoupling tank  90  is in flow connection with a pump inlet of the pump  80  by way of an outlet not depicted in the drawing. 
     Connected to the float valve  96  is a water supply line  98 , by way of which the decoupling tank  90  is connectable to a public water supply network, such that water can be fed from the water supply network to the decoupling tank  90 , said water then being able to be pressurized by the pump  80  and then heated by the heat exchanger  28 . 
     Arranged over the decoupling tank is a refill container  100  for a descaling solution, which can be admixed to the water in order to prevent calcification of the heat exchanger. The refill container  100  comprises a pivotable filler neck  102 , which, for the purpose of filling the refill container, can be pivoted about a vertical pivotal axis  104  from its parking position depicted in  FIG. 5  into a refilling position, not depicted in the drawing, in which the filler neck  102  projects beyond the first longitudinal side  81  of the fuel tank  32 . 
     The fuel tank  32  is configured as a multi-functional part. In the form of a seamless hollow body, it forms not only a storage tank for liquid fuel, but also forms the entire housing lower part  12 , which accommodates the electric motor  76  and the pump  80  as well as the blower  84 , and which also forms the decoupling tank  90 . The configuration in the form of a one-piece closed plastic hollow body gives the fuel tank  32  a significant mechanical stability, the mechanical stability being further increased by the pocket-shaped recess  86  and the through-duct  44 . 
     For additionally increasing the mechanical stability, the high pressure cleaning appliance  10  comprises a supporting metal structure in the form of a support frame  110 , which is formed by bent pipes that are rigidly connected to one another, and thus said support frame  110  is configured as a pipe frame  112 . This is made clear in particular in  FIG. 7 . 
     The support frame  110  forms a shock protector for the fuel tank  32 , which, in the embodiment depicted, completely surrounds the fuel tank  32  in the circumferential direction. In relation to the main movement direction  26 , the support frame  110  projects beyond the front side  36  of the fuel tank  32  and also beyond the rear side  114  thereof. Moreover, the support frame  110  projects transversely to the main movement direction  26  beyond the longitudinal sides  81  and  85  of the fuel tank  32 . 
     The support frame  110  comprises a first rigid side frame part  116 , which is configured as a self-contained support frame side portion  118 . The support frame  110  also comprises a second rigid side frame part  120 , which is configured as a self-contained second support frame side portion  122 . The first side frame part  116  is arranged on the first longitudinal side  81  of the fuel tank  32  and the second side frame part  120  is arranged on the opposing second longitudinal side  85  of the fuel tank  32 . A first covering  124  in the form of a perforated metal sheet is removably held on the first side frame part  116 , and a second covering  126  in the form of a second perforated metal sheet is removably held on the second side frame part  120 . This is clear in particular from  FIGS. 1 and 2 . Arranged between the first covering  124  and the first side frame part  120  is an opening  128 , which enables a user direct access to the face side  130  of the pump  80  facing away from the electric motor  76 , in order to be able to perform, for example, adjustment work on the pump  80  and to be able to fill the refill container  100  with a descaling solution. 
     The two side frame parts  116 ,  120  are rigidly connected to one another by way of a front frame part  132  of the support frame  110 . The front frame part  132  comprises a U-shaped support frame front portion  134 , which extends from the first side frame part  116  along the front side  36  of the fuel tank  32  to the second side frame part  120 . 
     The support frame  110  forms the undercarriage  24 . For this purpose, the support frame  110  comprises a base frame part  136 , which is configured as a U-shaped support frame base portion  138 . The support frame base portion  138  comprises a first leg  140  and a second leg  142 , which are oriented in parallel to the main movement direction  26  and are connected to one another in one piece by way of a web  144  oriented transversely to the main movement direction  26 . The free ends of the two legs  140 ,  142  facing away from the web  144  are rigidly connected to one another by way of a traverse  146 . 
     Arranged between the end portions of the two legs  140 ,  142  facing toward the web  144  is the aforementioned base plate  30 , which bears the heat exchanger  28 . 
     The first leg  140  is welded to the first side frame part  116  by way of two first pipe pieces  148 ,  150 , and the second leg  142  is welded to the second side frame part  120  by way of two second pipe pieces  152 ,  154 . 
     Moreover, the support frame  110  comprises a rigid attachment frame part  156 , by way of which the first side frame part  116  is rigidly connected, on its top side facing away from the base frame part  136 , to the second side frame part  120 . The attachment frame part  156  engages over the fuel tank  32 , extending transversely to the main movement direction  26 . It comprises a first support frame attachment portion  158  and a second support frame attachment portion  160 , which are oriented at an obtuse angle to one another and are connected to one another in one piece. In the connecting region between the first support frame attachment portion  158  and the second support frame attachment portion  160 , a crane hook, which is not depicted so as to achieve a better overview, can engage around the attachment frame part  156  in order to lift the entire high pressure cleaning appliance  10 . 
     A first rigid rear frame part  162 , which is of stirrup-shaped configuration, extends from a rear side of the first side frame part  116  facing away from the front frame part  132  to the first support frame attachment portion  158  and forms a first grip  164  of the high pressure cleaning appliance  10 . A second rigid rear frame part  166 , which is also of stirrup-shaped configuration, extends from a rear side of the second side frame part  120  facing away from the front frame part  132  to the second support frame attachment portion  160  and forms a second grip  168  of the high pressure cleaning appliance  10 . The two rear frame parts  162 ,  166 , like the base frame part  136 , projects counter to the main movement direction  26  beyond the rear side  114  of the fuel tank  32  and beyond the rear side of the heat exchanger  28 . 
     The support frame  110  forms a shock protector, which ensures that the fuel tank  32  is not damaged upon unintentionally striking an obstacle. 
     The housing lower part  12  formed by the fuel tank  32  is covered by the housing upper part  14 . The housing upper part  14  is configured as a one-piece closed plastic hollow body and is produced by rotational molding. It comprises a through-channel  170 , which extends from a top side  172  of the housing upper part  14  to a bottom side  174  of the housing upper part  14  and which is passed through by an exhaust pipe  176  in a rear region facing away from the front side  36  of the fuel tank  32 , by way of which exhaust pipe  176  exhaust gas from the heat exchanger  28  can be released. 
     In front of the exhaust pipe  176  in relation to the main movement direction  26 , the through-channel  170  provides access to the attachment frame part  156  This makes it possible for the user to fix a crane hook or a lifting strap to the attachment frame part  156  of the support frame  100  without having to reveal the attachment frame part  156  by, for example, removing the housing upper part  14  from the housing lower part  12 . 
     At a distance from the through-channel  170  in the main movement direction  26 , the housing upper part  14  comprises a substantially rectangular perforation  178  on which an operating panel  180  is arranged, which bears on its top side a main switch  182  for switching the electric motor  76  on and off. 
     On its rear side  184 , the housing upper part  14  forms a winding hook  186  on which, for example, a pressure hose and/or an electrical cable can be wound. The winding hook  186  is arranged between the first grip  164  and the second grip  168 . 
     The high pressure cleaning appliance  10  is distinguished by low manufacturing costs and by a high mechanical stability. Both the housing lower part  12  and the housing upper part  14  are produced by rotational molding and form one-piece, seamless plastic hollow bodies. The housing lower part  12  is formed by the fuel tank  32 , which is supported by the support frame  110  and which not only forms the undercarriage  24  of the high pressure cleaning appliance  10  but also a shock protector that prevents damage to the fuel tank  32  upon the high pressure cleaning appliance  10  impacting an obstacle.