EP2152440A2

EP2152440A2 - Surface cleaning head

Info

Publication number: EP2152440A2
Application number: EP08758969A
Authority: EP
Inventors: Jürgen Binder; Andreas Schwarz; Vitali Fischer
Original assignee: Alfred Kaercher SE and Co KG
Current assignee: Alfred Kaercher SE and Co KG
Priority date: 2007-06-13
Filing date: 2008-06-03
Publication date: 2010-02-17
Anticipated expiration: 2028-06-03
Also published as: DK2152440T3; PL2152440T3; CN101678406B; WO2008151743A3; CN101678406A; WO2008151743A2; DE102007029245A1; EP2152440B1

Abstract

The invention relates to a surface cleaning head (10) comprising a hood-shaped housing (11) that is open towards the base, at least one spray arm (85, 86) that is mounted in a freely rotatable manner about a rotatable axis that is mounted in said housing. Said spray arm bears a nozzle (91) that can be impinged with a pressurised cleaning fluid and which rotates about the rotational axis together with the spray arm in order to impinge the surface that is to be cleaned with a liquid jet. The aim of the invention is to further develop the surface cleaning head in such a manner that corner areas of the surface that is to be cleaned are also subjected to a pressurised fluid in a simple manner. As a result, the surface cleaning head comprises an additional nozzle (80) that is rotationally fixed and that can be impinged upon with a pressurised cleaning fluid.

Description

Surface cleaning head

The invention relates to a surface cleaning head for cleaning a surface, with a hood-shaped, downwardly open housing in which at least one Sprϋharm is freely rotatable about an axis of rotation, which carries a nozzle which can be acted upon with pressurized liquid and together with the spray arm revolves around the axis of rotation to act on the surface to be cleaned with a liquid jet.

Such surface cleaning heads are from the German patent

DE 102 06 013 Cl is known. They are particularly suitable for cleaning

Hard surfaces, such as stone or wooden terraces, garage entrances and garage doors. For this purpose, it is only necessary to connect to the surface cleaning head, the pressure line of a high-pressure cleaner, so that pressurized cleaning liquid can be supplied to the arranged on the spray arm nozzle. With the help of the nozzle, the cleaning liquid can be sprayed onto the surface to be cleaned. The nozzle undergoes a recoil, so that the spray arm is rotated. This makes it possible to apply a relatively large area within a short time with cleaning liquid. Usually, at least two spray arms are used, each carrying a nozzle, wherein the nozzles are acted upon simultaneously with pressurized cleaning liquid. '

Each held on a spray arm nozzles perform during operation of the surface cleaning head from a circular motion. As already explained, this makes it possible to clean a relatively large area within a short time. The cleaning of corner areas of the area is however made more difficult.

Object of the present invention is to develop a surface cleaning head of the generic type such that even corner regions of the surface to be cleaned can be acted upon in a simple manner with pressurized Reinigungsflüs- sigkeit.

This object is achieved according to the invention in a surface cleaning head of the type mentioned in that it has a non-rotatably mounted additional nozzle which can be acted upon with cleaning fluid under pressure, for applying a liquid jet to the surface to be cleaned.

In addition to the at least one nozzle, which is arranged on a spray arm and rotates together with the latter about the axis of rotation, an additional nozzle is used in the surface cleaning head according to the invention, which is held against rotation relative to the axis of rotation of the at least one spray arm. As a result, the user can specifically apply cleaning fluid to a specific area of the area to be cleaned, for example, a corner area of the area to be cleaned can be easily reached by the additional nozzle. The liquid jet discharged from the auxiliary nozzle impinges on the surface to be cleaned outside the circular region defined by the nozzle rotating together with the respective spray arm.

It can be provided that nozzles, which are held in each case by a rotating spray arm, are acted upon at the same time as the auxiliary nozzle by pressurized cleaning liquid, so that all the nozzles of the bottle are pressurized. chenreinigungskopfes simultaneously direct a liquid jet on the surface to be cleaned.

In an advantageous embodiment of the surface cleaning head has a switching device by means of which either the together with a spray arm rotating nozzle and / or the additional nozzle can be acted upon with cleaning liquid. This gives the user the ability to selectively apply to the surface to be cleaned with a liquid jet, which rotates about the axis of rotation of the spray arms, and / or with a liquid jet from the auxiliary nozzle. In particular, corner regions of the surface to be cleaned can be specifically cleaned by means of the additional nozzle.

The additional nozzle may be formed as a low-pressure nozzle and each held on a rotating spray arm nozzles may be formed as high-pressure nozzles. This gives the user the opportunity to apply in a first cleaning step, the surface to be cleaned with very high pressure cleaning liquid to solve adhering to the surface dirt. The dissolved dirt can then be rinsed off the surface by lower-pressure cleaning fluid, which is discharged from the auxiliary nozzle.

In order to simplify the handling of the surface cleaning head, the switching device in a preferred embodiment, at least one actuator movably held on the housing. By actuating the actuator, the switching device can be converted into different switching positions. The switching device may, for example, be designed such that in a first switching position only the together with a spray arm rotating about the axis of rotation nozzles are pressurized with pressurized cleaning liquid, whereas in a second switching position, only the auxiliary nozzle is pressurized with pressurized cleaning liquid. It is favorable if the switching device has a third switching position in which both the nozzles rotating together with a spray arm and the additional nozzle are supplied with cleaning liquid. The respective switching position can be selected by the user by means of the at least one, on the housing movably held actuator.

A particularly simple handling is achieved in a preferred embodiment in that the switching device has two movably held actuators. By means of the two actuators, the user can select one of two switching positions of the switching device in a very simple, intuitively detectable manner.

It can be provided, for example, that the switching device has two foot pedals, which are each held movably on the housing.

In a particularly preferred embodiment, the switching device on a user-operable valve, wherein by means of the valve, a flow connection of a connection part of the surface cleaning head is selectively releasable to each held on a spray arm nozzles and / or to the auxiliary nozzle. If the valve has only two switch positions, alternatively, the nozzles respectively held on a spray arm or the additional nozzle can be supplied with pressurized cleaning liquid. However, it can also be provided that the valve has three switch positions. includes, so that in the third switching position all nozzles can be acted upon simultaneously with cleaning liquid.

It is expedient if the valve has a valve body which is movably held in a valve receptacle and between a first end position in which it releases the flow connection to the nozzles respectively held on a spray arm and blocks the flow connection to the additional nozzle and a second end position in which it blocks the flow connection to the respective nozzles held on a spray arm and releases the flow connection to the additional nozzle, is movable back and forth. The two end positions can each be predetermined by a stop element, so that the valve body can be moved in a simple manner between its two end positions back and forth in order to achieve the respective desired switching position of the switching device. This facilitates the operation of the surface cleaning head.

It is advantageous if the valve body can be acted upon by a pressure force in the direction of its respectively assumed end position. In such an embodiment, the valve is designed to be self-holding by the valve body remains in its once occupied end position due to the pressure force acting on it until it is selectively transferred by the user in the other end position. By providing a pressure force acting on the valve body, the use of additional restoring elements, for example the use of spring elements, can be dispensed with.

In a structurally particularly simple embodiment, the valve receptacle is designed as a valve bore and the valve body as a valve piston, wherein the valve piston is slidably held in the valve bore. By moving the valve piston, the different switching positions of the valve can be adjusted in a simple manner.

It is particularly advantageous if the valve bore is designed as a through hole, which is penetrated by the valve piston. The valve piston can thereby project with its end regions over the valve bore and be pushed back and forth by applying force to the protruding end portions in a simple manner. In this case, it is expedient for the valve piston to carry a radial widening on at least one projecting end region, for example a peripheral bead which serves as a stop defining a final position.

Preferably, the valve piston is displaceable about a valve axis oriented perpendicular to the axis of rotation of the at least one spray arm. The axis of rotation of the at least one spray arm may, for example, be oriented perpendicular to the surface to be cleaned. When cleaning a bottom surface, the axis of rotation of the at least one spray arm thus assumes a vertical orientation and the valve axis is aligned horizontally. It has been shown that this simplifies the handling of the surface cleaning head.

The valve piston is displaceable in an advantageous embodiment by means of two actuators in opposite directions, wherein between the actuators and the valve piston in each case a force transmission member is arranged. The force transmission members allow a deflection of the actuating force exerted by the actuators, so that the application of the valve piston with perpendicular to Valve axis aligned force components can be kept low. The risk that the valve piston canted in the valve bore is thereby reduced.

It is advantageous if the actuators and the power transmission members are pivotally mounted. It has proved to be advantageous when the pivot axis of the power transmission elements are aligned parallel and offset in the direction of the valve piston to the pivot axes of the actuators.

The actuators can be configured, for example, as pivotable foot pedals whose pivot axes are aligned parallel to the longitudinal axis of the housing, wherein the foot pedals are hinged to the housing top to the housing.

The force transmission members may be formed as pivot arms whose pivot axis are arranged below the pivot axis of the foot pedals and aligned parallel thereto. In this case, the pivot arms can be held in each case in a bearing shell, which is arranged above a protruding from the valve bore end portion of the valve piston. By pivoting the foot pedals, an actuating force can then be generated, which is transmitted from the respective force transmission member to the valve piston, wherein the valve piston practically only coaxial with the valve axis aligned force components act.

In a particularly preferred embodiment of the surface cleaning head according to the invention, the at least one spray arm on a supply line rotatably supported, which is adjustable in height relative to a central distributor part, wherein the distributor part has the switching device. The at least one Sprϋharm is thus height adjustable together with the supply line. This makes it possible to vary the distance between the nozzles rotating around the axis of rotation of the spray arms and the surface to be cleaned. If the surface to be cleaned is subjected to a very intense jet of liquid, the smallest possible distance between the nozzles rotating around the axis of rotation and the surface to be cleaned can be selected. However, if a sensitive surface to be cleaned, the user can choose a greater distance between the rotating nozzles and the surface by adjusting the supply line together with the at least one spray arm relative to the central distributor part.

At the central distributor part, the housing of the surface cleaning head can be fixed, for example, it can be provided that the housing can be latched or screwed to the distributor part.

The supply line is preferably designed as a pipe piece which is held displaceably in a bore of the distributor part. Preferably, the pipe piece is made of brass. The distributor part can be made of a plastic material, and also for the production of the spray arms, a plastic material can be used.

The supply line is preferably held non-rotatably to the distributor part and the spray arms are rotatable relative to the supply line about the axis of rotation. The surface cleaning head preferably has a supply pipe which can be connected to a liquid supply line and which opens into the distributor part. For example, the pressure line of a high-pressure cleaning device can be connected to the supply pipe, so that the surface cleaning head can be supplied with pressurized cleaning fluid via the supply pipe and the distributor part adjoining this.

The additional nozzle is preferably in fluid communication with the distributor part via a connecting line. In this case, a rigid connection can be used in the form of a connecting tube, but it can also be provided a flexible connection in the form of a connecting tube.

The auxiliary nozzle can be adjustable in height relative to the central distributor part, so that the user can change the distance between the additional nozzle and the surface to be cleaned.

It is particularly advantageous if the supply pipe is pivotably mounted in the distributor part, because this allows a user to change the orientation of the supply pipe relative to the distributor part.

It is particularly advantageous if the supply pipe is pivotably mounted in the distributor part about a pivot axis aligned transversely to the axis of rotation of the at least one spray arm. When cleaning a bottom surface, the axis of rotation of the at least one spray arm is preferably oriented vertically and the pivot axis of the feed tube assumes a horizontal orientation. This facilitates the handling of the surface cleaning head.

To adjust the height of the supply line of at least one, mounted on the supply line spray arm, the surface cleaning head preferably has a height-adjustable sliding part, which is held non-rotatably on the distributor part, but coaxially to the axis of rotation of the at least one Sprüharms and carries the supply line. The supply line can thus be moved together with the sliding part coaxial with the axis of rotation of the at least one spray arm relative to the distributor part.

The sliding part is secured against rotation relative to the distributor part, but it is displaceable relative to the distributor part coaxially with the axis of rotation of the at least one spray arm.

Preferably, the sliding part passes through the distributor part and is displaceable relative to the distributor part by means of a height adjustment member.

In an advantageous embodiment, an end region of the sliding part protruding upwards beyond the distributor part has an external thread, and the height adjustment element has a threaded sleeve screwed onto the external thread of the sliding part, which is held rotatably and immovably on the housing. By turning the threaded sleeve, the sliding part can be adjusted in height together with the supply line fixed to the sliding part and the at least one, on the supply line rotatably mounted spray arm. The threaded sleeve is preferably arranged on the upper side of the housing and therefore accessible to the user in a simple manner. By means of the housing, the area of the surface to be cleaned is covered by the nozzles respectively held by a spray arm and by the additional nozzle with cleaning liquid. Here, it is advantageous if the housing has a substantially annular side wall which surrounds the at least one spray arm and on the outside of a substantially V-shaped attachment part is attached, which extends over a portion of the outer periphery of the side wall and together with the from Neck portion covered area of the side wall defines a space in which at least the outlet opening of the auxiliary nozzle is arranged. The interior of the housing is divided in such a configuration into a first region which is surrounded by the side wall and which receives at least one spray arm, and a second region which receives at least the outlet opening of the auxiliary nozzle. It can be provided here that the entire auxiliary nozzle is arranged in this space, in a particularly compact embodiment of the surface cleaning head, only one end region of the auxiliary nozzle, which has the outlet opening of the additional nozzle, enters the room.

The space defined by the attachment part is substantially triangular in plan view with an arcuate base side formed by the side wall of the housing. In addition, the sides of the space formed by the attachment part can also be curved convexly or concavely.

It is particularly advantageous if the side wall of the housing and the attachment part each carry a splash guard at their free edges. As a splash guard, for example, a bristle strip can be used or a spray lip made of an elastic material.

In a particularly preferred embodiment, the auxiliary nozzle is designed as a rotor nozzle with a nozzle housing which is provided in an end wall with a cup-shaped bearing for the front, spherical end of a nozzle bore having a passage bore and which has an insert part with at least one tangential bore for a liquid , through which the liquid in the nozzle housing about the nozzle housing longitudinal axis is set into rotation, so that the nozzle body rotates together with the rotating liquid and thereby rests with a contact surface at its periphery to the inner wall of the nozzle housing, wherein the longitudinal axis of the nozzle body relative to the longitudinal axis of Nozzle housing is inclined. Such rotor nozzles are known for example from European Patent EP 0 600 937 Bl. With their help, a point-like liquid jet can be achieved, which rotates on a conical surface around the longitudinal axis of the nozzle housing. By means of such rotor nozzles, a particularly effective cleaning of a surface can be achieved.

Alternatively, the additional nozzle can also be designed in the form of a flat jet nozzle or else in the form of a spray nozzle.

It can also be provided that the surface cleaning head has a plurality of additional nozzles, which can be acted upon as an alternative or together with the respective held on a spray arm nozzles with pressurized cleaning liquid. The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

Figure 1: a perspective view of a surface cleaning head according to the invention;

FIG. 2 is a partially sectioned plan view of the surface cleaning head of FIG. 1;

FIG. 3: an enlarged view of detail A from FIG. 2;

Figure 4 is a sectional view taken along line 4-4 in Figure 2 and

FIG. 5: a sectional view along the line 5-5 in FIG. 2.

In the drawing, a surface cleaning head according to the invention, generally designated by the reference numeral 10, is shown schematically with a housing-shaped housing 11, which is open towards the surface to be cleaned and has a housing lower part 12 and an upper housing part 13. The lower housing part 12 comprises a circular in plan view, self-contained side wall 15 which projects from an intermediate wall 16 down and carries at its free edge 17 a circumferential splash guard 18. The lower housing part 12 also comprises an externally attached to the side wall 15 attachment portion 20 which is formed in plan view substantially V-shaped with a first leg 21 and a second leg 22 which define a housing tip 23 and also carry a splash guard 25 at its lower free edge 24.

The circumferential side wall 15 defines, in combination with the intermediate wall 16, a main space 27 of the housing 11 and the attachment part 20 defines, in combination with the area of the side wall 15 covered by the attachment part 20, an adjoining space 28 of the housing 11.

The housing upper part 13 comprises a cover 30, which extends virtually over the entire length of the housing lower part 12 into the region of the housing tip 23, transversely to the longitudinal extension of the surface cleaning head 10 but only over a partial region of the housing lower part 12. In addition, the upper housing part 13 comprises two arcuate handles 31, 32, which are integrally connected to the cover 30 and can be gripped by the user by hand. The cover 30, in combination with the area of the intermediate wall 16 covered by the cover 30, defines a distribution chamber 34 of the housing 11. From the distribution chamber 34, a nozzle shaft 35 leads into the secondary space 28.

In the distribution chamber 34, a central distributor part 37 is arranged, with which the lower housing part 12 is screwed by means of connecting screws 38. The lower housing part 12 in turn is screwed by means of connecting screws 39 with the upper housing part 13.

In the distributor part 34 opens a supply pipe 41 which is mounted pivotably about a transversely to the pipe longitudinal axis 42 aligned pivot axis 43 in the distributor part 34. At its side facing away from the distributor part 37 carries free end the supply pipe 41 is a connecting element 45, so that a known per se and therefore not shown in the drawing pressure line of a high-pressure cleaner can be connected to the feed pipe 41.

The supply pipe 41 is connected via a coaxially to the pivot axis 43 aligned first connecting channel 47 and adjoining this in the flow direction, obliquely to the pipe longitudinal axis 42 aligned second connecting channel 48 with a formed by the distributor part 37 valve seat in flow connection, the tion in the form of a continuous Ventilboh- 50th is designed. The valve bore 50 has a plurality of sections of different diameter. To a first end portion 51 of the valve bore 50 is connected via a step 52, a first central portion 53 of reduced diameter, which merges via a conical constriction 55 in a second central portion 56 with a further reduced diameter. A second end section 59 of the valve bore 50 adjoins the second middle section 56 via a conical extension 58.

The valve bore 50 is penetrated by a valve body, which is designed in the form of a valve piston 61 and in the longitudinal direction of the valve bore 50, that is in the direction of a valve axis 62, which is aligned parallel to the pivot axis 43 of the feed tube 41, back and forth.

In the region of the first end section 61, the valve piston 41 has a circumferential collar 64 which comes into contact with the step 52 with a corresponding axial displacement of the valve piston 61. The step 52 thus forms a first stop which defines an end position of the displaceable valve piston 61.

At its end region projecting beyond the second end section 59, the valve piston 61 has an annular bead 65 whose outer diameter is greater than the inner diameter of the second end section 59. As a result, the annular bead 65, as shown in FIG. 3, with suitable axial displacement of the valve piston 61 reaches the outside of the distributor part 37 to the plant. The annular bead 65 thus forms a second stop, which also defines an end position of the displaceable valve piston 61.

The valve piston 61 is formed in stages, wherein it has a smaller diameter in a central region than at its end regions. Within the first central portion 53, the valve piston 61 tapers, wherein it carries in a region of enlarged diameter a first annular groove, in which a first O-ring is arranged. By means of the first O-ring 67, the valve piston 61 abuts sealingly against the wall of the first central section 63, independently of its respectively assumed position within the valve bore 50.

At a distance from the first O-ring 67, the valve piston 61 faces away from the circumferential collar 64 and, in a region of reduced outside diameter, carries a further annular groove in which a second O-ring 68 is arranged. The diameter of the second O-ring 68 is smaller than the diameter of the first O-ring 67. It is chosen such that the valve piston 61 sealingly abuts the wall of the second central portion 56 when displaced in the direction of the annular bead 65, whereas it When displaced in the direction away from the annular bead 65, it is arranged at a distance from the wall of the first center section 53 of the valve bore 50, as shown in FIG.

The second O-ring 68 is followed in the region of the valve piston 61 of reduced diameter, a further annular groove which receives a third O-ring 69, whose diameter is chosen to be the same size as the diameter of the second O-ring 68. The Valve piston 61 is displaced in the direction away from the annular bead 65, as shown in Figure 3, the valve piston 61 is located on the third O-ring 69 in a conical extension 68 adjacent region on the wall of the second middle section 56.

At a distance from the third O-ring 69, the valve piston 68 in a region of enlarged diameter on a further annular groove which receives a fourth O-ring 70. The diameter of the fourth O-ring 70 coincides with the diameter of the first O-ring 67. By means of the fourth O-ring 70, the valve piston 61 bears against the wall of the second end section 69, regardless of its respective position.

The second connecting channel 48 opens approximately centrally into the second middle section 56 of the valve bore 50. The conical constriction 55 immediately adjacent to the first center section 53 of the valve bore 50 connects to a third connecting channel 73, which the valve bore 50 with a downwardly directed blind bore 74 of the distributor part 37 connects. The conical extension 58 immediately adjacent to the second end portion 59 connects to a fourth connecting channel 76, which connects the valve bore 50 with a connecting tube 77. Via the connecting pipe 77, the distributor part 37 is in flow connection with an additional nozzle 80, which is arranged in the nozzle shaft 35 and explained in more detail below.

Into the blind bore 74 of the distributor part 37, a supply line 82 is immersed, which is designed in the form of a brass tube and is sealed by means of an O-ring 83 against the wall of the blind bore 74. Within the blind bore 74, the feed line 82 can be displaced in the longitudinal direction.

At its end region facing away from the O-ring 83, the supply line 82 carries two diametrically opposed spray arms 85, 86, each having a flow channel 88 and 89, respectively, and carrying at their free end a nozzle 91 and 92, respectively. These nozzles 91, 92 produce an obliquely downwardly directed liquid jet of a cleaning liquid which, upon exiting the nozzles 91, 92, exerts a torque on the spray arms 85 and 86, respectively, by reaction forces and thereby causes them to rotate. The axis of rotation 93 is aligned coaxially with the longitudinal axis of the feed line 82 and the longitudinal axis of the blind bore 74.

Above the spray arms 85, 86, the feed line 82 carries an external thread 95, via which the feed line 82 is connected to a fork-shaped sliding part 97. The sliding part 97 comprises a shaft-like fork head 98 with a continuous threaded hole 99, via which the supply line 82 is connected to the sliding part 97. In addition, the sliding part 97 has two forks 101, 102, the spray arms 85, 86 facing away from the top of the clevis 98 and each pass through a sickle-shaped passage 105 and 106 of the distributor part 37. At their end region facing away from the clevis 98, the forks 101, 102 carry an external thread

108 with very high gradient. On this external thread 108, a threaded sleeve 110 of a height adjustment member 111 is screwed. The threaded sleeve 110 is closed at its upper end 112 and integrally connected to a dome-shaped handle portion 113 which engages with an outwardly projecting annular flange 114 an edge 116 of an opening of the cover 30. By rotating the grip portion 113 about the rotation axis 93, the slide member 97 together with the lead 82 and the spray arms 85, 86 can be displaced coaxially with the rotation axis 93 to vary the distance that the nozzles 91, 92 occupy to a surface to be cleaned ,

The auxiliary nozzle 80 is in the form of a rotor nozzle and comprises a nozzle housing 120 with a rear housing part 121 and a front housing part 122. The connecting tube 77 opens into the rear housing part 121, which is screwed into the front housing part 122 with the interposition of an insert 124, the has a plurality of tangential bores through which the interior of the rear housing part 121 is in fluid communication with the interior of the front housing part 122. The front housing part

121 is configured in a substantially frusto-conical shape and ends in an end wall 126, which is provided with an outlet opening 127 and on the inside forms a cup-shaped bearing for the spherical front end of a nozzle body 129 arranged in the front housing part 122, which has a passage bore 130 and on which Inner wall of the front housing part

122 is present.

If the auxiliary nozzle 80 is supplied with pressurized cleaning liquid, it flows tangentially into the front housing part 122 via the tangential bores of the insert 124 and rotates within the front housing part 122 about the longitudinal axis 132 of the nozzle housing 120. The rotating liquid displaces the cleaning fluid on the inner wall of the housing front housing parts 122 nozzle body in rotation about the longitudinal axis 132, wherein the Düsenkör- perl longitudinal axis 133 relative to the housing longitudinal axis 132 is inclined. As a result, a point-shaped liquid jet rotating about the housing longitudinal axis 132 is emitted by the additional nozzle 80.

The optional supply of cleaning liquid starting from the supply pipe 41 via the connecting channels 47 and 48 and the valve bore 50 selectively to each held on a spray arm 85 and 86 nozzles 91 and 92 or to the additional nozzle 82 is effected by moving the valve piston 61 along the valve axis 62 between the by the circulating

Bund 64 and the annular bead 65 predetermined end positions. To move the valve piston 61, the surface cleaning device 10 includes two actuators in the form of a first foot pedal 136 and a second foot pedal 137, which are each mounted pivotably about a pivot axis 138 and 139 on the cover 30. The foot pedals 136, 137 each cooperate with a power transmission member in the form of a pivot arm 141, 142, respectively. The pivot arms 141, 142 are each arranged between a foot pedal 136 or 137 and an end face 144 or 145 of the valve piston 61. The pivot axes 147, 148 of the pivot arms 141 and 142 are arranged parallel to the pivot axes 138, 139 of the foot pedals 136 and 137 and in the direction of the distributor part 37 offset therefrom. The pivot axes 147, 148 are each arranged above one end of the valve piston 61. This becomes clear in particular from FIG. Via the pivot arms 141, 142, a movement of the foot pedals 136 and 137 can be transmitted to the valve piston 61, wherein the valve piston 61 is practically acted upon only with coaxial with the valve axis 62 oriented force components. The danger that the Valve piston 61 tilted by operating the Fußpedale 136, 137 within the valve bore 50 is thereby kept very low.

If the user actuates the first foot pedal 136, the valve piston 61 in the valve bore 50 is displaced until the annular bead 65 rests against the distributor part 37 on the outside, as shown in FIG. In this position, the valve piston 61 releases the flow connection between the second connecting channel 48 and the third connecting channel 73, so that the liquid supplied from the supply pipe 41 from the supply pipe 41 via the first connecting channel 47, the second connecting channel 48, the second center I section 56 and the first central portion 53 of the valve bore 50 can flow to the third connecting channel 73, from which the cleaning fluid via the blind bore 74 and the feed line 82 to the flow channels 88, 89 of the spray arms 85, 86 and finally to the nozzles 91, 92 can pass , Thus, by actuating the first foot pedal 36, a surface to be cleaned can be acted upon by cleaning liquid by means of the nozzles 91, 92 revolving around the rotation axis 93.

The position reached by actuation of the first foot pedal 136 is automatically maintained by the valve piston 61 due to the pressure force of the cleaning liquid acting on it. This automatic property is achieved in that in the above-mentioned position, the sealing of the valve piston 61 relative to the inner wall of the valve bore 50 on the one hand by the first O-ring 67 and on the other hand by the third O-ring 69 is achieved. The first O-ring 67 has a significantly larger diameter than the third O-ring 69, and this in turn has the result that the pressurized cleaning fluid the valve piston in the region of the first O-ring 67 is subjected to a greater pressure force than in the region of the third O-ring 69. Thus, the valve piston 61 is acted upon actuation of the first foot pedal 136 with a compressive force that holds the valve piston 61 reliably in the assumed end position.

If the user actuates the second foot pedal 137, then the valve piston 61 is displaced within the valve bore 50 until the peripheral collar 64 comes into contact with the step 52. In this position, the second O-ring 68 seals against the inner wall of the second middle section 56, so that the valve piston 61 blocks the flow connection between the second connecting channel 48 and the third connecting channel 73 due to the sealing engagement of the second O-ring 68 , Instead, the valve piston 61 releases the flow connection between the second connection channel 48 and the fourth connection channel 76, since, when the circulating collar 64 rests against the step 52, the third O-ring 69 assumes a position within the second end section 69 of the valve bore 50 , Due to its relatively small diameter, the third O-ring 69 is disposed within the second end portion 59 at a distance from the inner wall thereof, whereas the fourth O-ring 70 sealingly abuts against the inner wall. By actuating the second foot pedal 137, the valve piston 61 is thus displaced so far within the valve bore 50 that cleaning liquid from the supply tube 61 via the first connecting channel 47, the second connecting channel 48, the second middle section 56 and the second end portion 59 of the valve bore 50 to the fourth Connecting channel 76 and the adjoining this connecting pipe 77 can flow, so that the auxiliary nozzle 80 can be supplied with pressurized cleaning liquid. The position taken after actuation of the second foot pedal 137 retains the Valve piston 61, because it is acted upon by the pressurized cleaning fluid with a compressive force, which is oriented such that the encircling collar 64 is pressed against the step 52. The reason for this is that the sealing of the valve piston 61 with respect to the valve bore 50 in this position on the one hand by the second O-ring 68 abutting the inner wall of the second middle section 56 and on the other hand by the fourth adjacent to the inner wall of the second end section 59 O-ring 70 is achieved. The diameter of the fourth O-ring 70 is set larger than the diameter of the second O-ring 68, and this in turn has the result that the resulting pressure force reliably holds the valve piston 61 in its end position assumed by actuation of the second foot pedal 137.

A surface to be cleaned can be acted upon by means of the surface cleaning device 10 optionally with cleaning fluid from the nozzles 91, 92 revolving around the axis of rotation 93 or with cleaning fluid from the additional nozzle 80. By means of the circulating nozzles 91, 92, a relatively large area can be cleaned within a short time, and by using the additional nozzle 80, corner areas of the area to be cleaned can be reliably supplied with cleaning liquid.

Claims

1. surface cleaning head for cleaning a surface, with a hood-shaped, downwardly open housing in which at least one Sprüarm is freely rotatably mounted about an axis of rotation, which carries a nozzle which can be acted upon with pressurized cleaning liquid and together with the spray arm revolving around the axis of rotation for acting on the surface to be cleaned with a liquid jet, characterized in that the surface cleaning head (10) has a rotatably held additional nozzle (80) which can be acted upon with pressurized cleaning liquid.

2. surface cleaning head according to claim 1, characterized in that the surface cleaning head (10) has a switching device, by means of which optionally together with a spray arm (85, 86) rotating nozzles (91, 92) and / or the additional nozzle (80) Cleaning liquid can be acted upon.

3. surface cleaning head according to claim 2, characterized in that the switching device has at least one on the housing (11) movably held actuator (136, 137).

4. surface cleaning head according to claim 2 or 3, characterized in that the switching means comprises two movably held actuators (136, 137).

5. Surface cleaning head according to claim 2, 3 or 4, characterized in that the switching means comprises two foot pedals (136, 137) which are each movably held on the housing (11).

6. surface cleaning head according to one of claims 2 to 5, characterized in that the switching means comprises a user operable valve, wherein by means of the valve, a flow connection of a connecting element (45) of the surface cleaning head (10) optionally to each of a spray arm (85 , 86) held nozzles (91, 92) and / or to the auxiliary nozzle (80) is releasable.

7. surface cleaning head according to claim 6, characterized in that the valve has a valve body (61) which is movably held in a valve receptacle (50) and between a first end position in which he the flow connection to each of a spray arm (85, 86) and the flow connection to the additional nozzle (80) locks, and a second end position in which it blocks the flow connection to each of a spray arm (85, 86) held nozzles (91, 92) and the flow connection to the additional nozzle (80) releases, is movable back and forth.

8. Surface cleaning head according to claim 7, characterized in that the valve body (61) can be acted upon by a pressure force in the direction of its respective assumed end position.

9. surface cleaning head according to claim 7 or 8, characterized in that the valve seat as a valve bore (50) and the valve body as a valve piston (61) is configured, wherein the valve piston (61) is slidably held in the valve bore (50).

10. surface cleaning head according to claim 9, characterized in that the valve piston (61) about a perpendicular to the axis of rotation (93) of the at least one spray arm (85, 86) aligned valve axis (62) is displaceable.

11. surface cleaning head according to claim 9 or 10, characterized in that the valve piston (61) by means of two actuators (136, 137) is displaceable in opposite directions, wherein between the actuators (136, 137) and the valve piston (61) each one Power transmission member (141, 142) is arranged.

12. surface cleaning head according to claim 11, characterized in that the actuating members (136, 137) and the force transmission members (141, 142) are pivotally mounted.

13. surface cleaning head according to claim 12, characterized in that the pivot axes (147, 148) of the force transmission members (141, 142) parallel and in the direction of the valve piston (61) offset from the pivot axes (138, 139) of the actuators (136, 137) are aligned.

14. surface cleaning head according to one of claims 2 to 13, characterized in that the at least one spray arm (85, 86) is rotatably supported on a supply line (82) which is adjustable in height relative to a distributor part (37), wherein the distributor part (37 ) comprises the switching device.

15. surface cleaning head according to claim 14, characterized in that the supply line (82) is designed as a pipe piece which is slidably held in a bore (74) of the distributor part (37).

16. surface cleaning head according to claim 14 or 15, characterized in that the surface cleaning head (10) has a supply pipe (41) to which a liquid supply line is connectable and which opens into the distributor part (37).

17. surface cleaning head according to claim 16, characterized in that the supply pipe (41) in the distributor part (37) about a transversely to the axis of rotation (93) of the at least one spray arm (85, 86) aligned pivot axis (43) is pivotally mounted.

18. surface cleaning head according to one of claims 14 to 17, characterized in that the distributor part (37) on the housing (11) is fixed.

19. Surface cleaning head according to claim 14, characterized in that the surface cleaning head (10) comprises a height-adjustable sliding part (97) which is non-rotatable on the distributor part (37) but coaxial with the axis of rotation (93) of the at least one spray arm (85, 85). 86) is slidably held and which carries the supply line (82).

20. surface cleaning head according to claim 19, characterized in that the sliding part (97) passes through the distributor part (37) and by means of a height adjustment member (111) relative to the distributor part (37) is displaceable.

21. surface cleaning head according to claim 20, characterized in that on the distributor part (37) upwardly projecting end portion of the sliding part (97) carries an external thread (108) and that the height adjustment member (111) on the external thread (108) of the Sliding part (97) screwed threaded sleeve (110), which is rotatably and immovably held on the housing (11).

22. Surface cleaning head according to one of the preceding claims, characterized in that the housing (11) has a substantially annular side wall (15) which surrounds the at least one spray arm (85, 86) and on the outside of a substantially V-shaped attachment part (20) is attached, which extends over a partial area of the outer circumference of the side wall (15) and together with the area of the side wall (15) covered by the attachment part (20) defines a space (28) in which at least one outlet opening (127) the additional nozzle (80) is arranged.

23. Surface cleaning head according to claim 22, characterized in that the side wall (15) and the attachment part (20) each carry a splash guard (18, 25) at their free edges.

24. surface cleaning head according to one of the preceding claims, characterized in that the additional nozzle (80) is designed as a rotor nozzle with a nozzle housing (120) in an end wall (126) with a cup-shaped bearing for the front, spherical end of a through hole (120). 130) having nozzle body (129) and which has an insert part (124) with at least one tangent tialbohrung for a liquid through which the liquid in the nozzle housing (120) about the housing longitudinal axis (132) is set in rotation, so that the nozzle body (129) rotates together with the rotating liquid and thereby at a contact surface at its periphery to the Inner wall of the nozzle housing (120) applies, wherein the longitudinal axis (133) of the nozzle body (129) relative to the longitudinal axis (132) of the nozzle housing (120) is inclined.