Spraying device and pressure cleaning device with spraying device

Abstract

The invention relates to an injection device for a pressure cleaning device (1), comprising: a base body (10); an ejection head (20) having an ejection opening (21) through which the cleaning liquid can be ejected; a nozzle (30) which can be arranged between the base body (10) and the nozzle head (20); a base connection device (40) by means of which the nozzle (30) can be detachably connected to the base body (10); and a head connection device (50) by means of which the nozzle (30) can be detachably connected to the injection head (20). The cleaning liquid can be conveyed from the base body (10) to the spray opening (21), in particular by means of a nozzle (30). The base connection device (40) can be released by means of a base release force. The head connection device (50) can be loosened by means of a head loosening force. The basic loosening force is different from the head loosening force.

Description

Technical Field

[0001] The present invention relates to a spraying device. Background Art

[0002] A pressure cleaning device comprises a base body, in particular a base body with a handle, and a spray head with a spray opening through which a cleaning liquid can be sprayed. A nozzle pipe may be arranged between the base body and the spray head. Typically, the nozzle pipe is releasably connected to the base body via a base connection device. In particular, the nozzle pipe can be releasably connected to the spray head via a head connection device. In the connected state, cleaning liquid can be conveyed, in particular via the nozzle pipe, from the base body to the spray opening. Summary of the Invention

[0003] The object of the present invention is to develop an injection device of this type in such a way that an unintentional loosening of the connection device is reliably avoided.

[0004] This object is achieved by a spray device for a pressure cleaning device, wherein the spray device comprises: a basic body; a spray head with a spray opening, through which a cleaning liquid can be sprayed; a nozzle, which can be arranged between the basic body and the spray head; a basic connecting device, by means of which the nozzle can be releasably connected to the basic body; and a head connecting device, by means of which the nozzle can be releasably connected to the spray head, wherein the cleaning liquid can be conveyed from the basic body to the spray opening, wherein the basic connecting device can be releasable using a basic release force, wherein the head connecting device can be releasable using a head release force, and wherein the basic release force and the head release force are not the same.

[0005] The base connection can be loosened using a base release force, and the head connection can be loosened using a head release force. According to the present invention, the base release force and the head release force are of different magnitudes. The smaller of the two release forces determines which of the two connection devices is more likely to be loosened. The other of the two connection devices (the one associated with the larger release force) is protected from unintentional loosening because, when the release force is applied, the connection device associated with the smaller release force is loosened first.

[0006] In particular, the greater of the two release forces is at least 105%, in particular at least 110%, in particular at least 150% of the smaller release force.

[0007] In particular, the cleaning liquid can be conveyed from the base body to the spray opening via the nozzle. In particular, the cleaning liquid is guided directly into the nozzle. The nozzle preferably includes a channel formed by the inner wall of the nozzle. The cleaning liquid preferably flows along the inner wall and comes into direct contact with the inner wall. In particular, no hose, constructed separately from the nozzle, is provided for guiding the cleaning liquid.

[0008] In particular, the cleaning liquid flows through the basic connecting device, and the basic connecting device itself seals the spraying device towards the outside to prevent the cleaning liquid from escaping.

[0009] In particular, the cleaning liquid flows through the head connection device, and the head connection device itself seals the spray device outwardly to prevent the cleaning liquid from escaping.

[0010] In particular, the base body comprises a handle.

[0011] Especially, the basic connecting device utilizes the basic releasing force to loosen so that the nozzle can be reversibly separated from the matrix. Especially, the head connecting device utilizes the head releasing force to loosen so that the spray head can be reversibly separated from the nozzle.

[0012] Advantageously, the head release force is smaller than the base release force. Consequently, when the user applies a release force, the head connection releases before the base connection. This allows, for example, the spray head to be released without simultaneously releasing the spray tube from the base body. This reliably prevents unintentional release of the base connection.

[0013] In an advantageous refinement of the present invention, the spray device comprises at least a first spray head and a second spray head. Advantageously, the spray device can be used selectively with the first spray head or the second spray head. In particular, the first spray head and the second spray head have different properties. Preferably, the first spray head and the second spray head have different nozzles. This allows the spray device to be adapted to the respective application. In particular, if the head release force is less than the base release force, a simple exchange between the first and second spray heads is possible. When replacing the first spray head with the second spray head or vice versa, it is reliably prevented that the base connection device is first loosened. This prevents the nozzle from accidentally loosening from the base body, in particular even though only the nozzle head is to be loosened from the nozzle.

[0014] Suitably, the basic connection device comprises a basic element at the base body and a basic nozzle element at the nozzle. In particular, the head connection device comprises a head element at the injection head and a head nozzle element at the nozzle.

[0015] Preferably, the spray device is designed so that the spray head can be fastened directly to the base body without an intermediate connecting nozzle. In particular, the spray device is designed so that a direct connection can be established by the interaction of the head element of the head connecting device and the base element of the base connecting device. The spray device can thus be used selectively with or without a nozzle. When used without a nozzle, the spray head is connected to the base body by the interaction of the head element of the head connecting device and the base element of the base connecting device. In this way, the head element of the head connecting device and the base element of the base connecting device form a short connecting device. When the spray device is used with a nozzle, the nozzle is connected to the base body by means of the base connecting device, and the spray head is connected to the nozzle by means of the head connecting device. The spray device can thus be used selectively with or without a nozzle.

[0016] Advantageously, the base connection and / or the head connection are at least also rotationally connected. In particular, the base connection and / or the head connection can be released and / or closed by means of a rotational movement, in particular a rotational movement in the circumferential direction of the nozzle. In particular, the circumferential direction surrounds the spray direction of the spray device. The spray direction is the direction in which liquid is sprayed from the spray device. In particular, the spray direction extends in the longitudinal direction of the nozzle. In particular, the base connection can be released and / or closed by relative movement of the base element and the base nozzle element in the circumferential direction. In particular, the head connection can be released and / or closed by relative movement of the head element and the head nozzle element in the circumferential direction.

[0017] In an advantageous refinement of the present invention, the base connection and / or the head connection comprise a bayonet-type connection. In particular, the base connection and / or the head connection are bayonet-type connections. A bayonet-type connection is a mechanical connection between two at least partially cylindrical components that can be quickly established and released along their longitudinal axes. The components can be connected and separated again by inserting them into each other and rotating them in opposite directions. In particular, one of the two components has a longitudinal guide extending along the longitudinal axis of the cylindrical outer shape. The longitudinal guide extends from the edge of the component to the inner end of the component. A transverse guide connected to the longitudinal guide extends transversely to the longitudinal guide. The other of the two components has a mating profile configured to engage with both the longitudinal guide and the transverse guide. The mating profile can be, for example, a protrusion. When connecting the bayonet-type connection, the mating profile is first introduced into the longitudinal guide and then moved in the longitudinal direction to the end of the longitudinal guide. Subsequently, the mating profile is introduced into the transverse guide by rotating the two components relative to each other about the longitudinal axis. This results in a secure connection. In particular, the connection is achieved via a tensile / rotational movement or an axial / rotational movement. Typically, the transverse guide extends obliquely from the end of the longitudinal guide toward the edge of the component carrying the longitudinal guide. It can be provided that the mating profile is preloaded in the transverse guide toward the edge of the first component by a spring. Typically, at least two longitudinal guides and two transverse guides are provided. Accordingly, at least two mating profiles are typically provided. A bayonet connection provides a simple and cost-effective connection method.

[0018] In an advantageous refinement of the invention, the spraying device comprises a base fixing element for fixing the base connecting device to prevent it from becoming loose. Alternatively, the spraying device can comprise a head fixing element for fixing the head connecting device to prevent it from becoming loose. This can prevent the connecting device from becoming unintentionally loosened.

[0019] In particular, the head release force should at least also be applied against the head securing force provided by the head securing element. Alternatively or additionally, it can be provided that the base release force should at least also be applied against the base securing force provided by the base securing element. In particular, the head securing force and the base securing force differ in their magnitude. Advantageously, the base securing force is greater than the head securing force. This ensures that the head connection is released before the base connection. In particular, the head securing force and the base securing force act in the same direction. In particular, the head release force and the base release force act in the same direction.

[0020] Advantageously, the basic fixing element is a first spring. Suitably, the head fixing element is a second spring. This allows for a simple provision of a head fixing force and a basic fixing force. The basic fixing element and the head fixing element can be easily manufactured.

[0021] Suitably, the spring hardnesses of the first spring and the second spring are different. Especially, the spring hardness of the first spring is greater than the spring hardness of the second spring.

[0022] The nozzle extends in the longitudinal direction from the base body to the injection head. In particular, the base fixing element acts in the longitudinal direction of the nozzle. Suitably, the head fixing element acts in the longitudinal direction of the nozzle. In particular, to release the head connection, a head release force must be applied, which acts at least in the longitudinal direction of the nozzle or opposite to the longitudinal direction of the nozzle. In particular, to release the base connection, a basic release force must be applied, which acts in the longitudinal direction of the nozzle or opposite to the longitudinal direction of the nozzle. This allows the base connection and the head connection to be secured in a simple manner to prevent unintentional release.

[0023] Suitably, the base fixing element presses the basic body and the nozzle tube apart from each other with respect to the longitudinal direction. Alternatively or additionally, the head fixing element presses the nozzle tube and the spray head apart from each other with respect to the longitudinal direction.

[0024] In an advantageous refinement of the present invention, the base connection is designed such that it can be detected from the outside whether it is in the closed or open position. Alternatively or additionally, it can be provided that the head connection is designed such that it can be detected from the outside whether it is in the closed or open position. This allows the user to easily check whether the spray device is ready for use, in particular whether the spray pipe or spray head is assembled correctly. Furthermore, the user can easily identify in which direction the head release force or the base release force must act to release the head connection or the base connection.

[0025] The bayonet connection has a male part and a female part. Suitably, a window, in particular a notch, is provided at the female part, thereby being able to identify from the outside whether the male part is in the female part in the closed position.

[0026] Advantageously, the pressure cleaning appliance comprises a spraying device according to the invention.

[0027] The nozzle pipe according to the present invention for a spraying device or pressure cleaning appliance forms part of a base connection and part of a head connection. For this purpose, the nozzle pipe according to the present invention comprises a base nozzle element and a head nozzle element. The base nozzle element is particularly designed to form a base connection together with a base element of a base body of the pressure cleaning appliance. The head nozzle element is expediently designed to form a head connection together with a head element of a spray head of the pressure cleaning appliance.

[0028] In particular, the pressure cleaning device is configured to spray a cleaning liquid. Suitably, the pressure cleaning device puts the cleaning liquid under pressure. In particular, the pressure cleaning device comprises a pump. Suitably, the cleaning fluid in the pressure cleaning device can be put under pressure by means of the pump. Advantageously, the cleaning liquid can be put under a pressure of at least 10 bar, in particular at least 15 bar, in particular at least 30 bar, and in particular at least 100 bar by means of the pump. In particular, the cleaning liquid can be put under a pressure of up to 600 bar, in particular up to 500 bar, by means of the pump. In particular, the pressure cleaning device is a high-pressure cleaning device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Next, embodiments of the present invention will be explained based on the accompanying drawings, wherein:

[0030] Figure 1 shows a perspective view of a pressure cleaning apparatus including a base, a spray head, and a nozzle;

[0031] Figure 2 Shown by Figure 1 A sectional view of a section of a pressure cleaning device in , wherein the cutting plane extends through the longitudinal axis of the nozzle;

[0032] Figure 3 An exemplary, partially cutaway perspective view of a head connection device or base connection device is shown;

[0033] Figure 4 A perspective view showing the male component of a head connection device or a base connection device;

[0034] Figure 5 A perspective view showing the female component of a head connection device or base connection device;

[0035] Figure 6 Shown without nozzle Figure 1 A perspective view of a pressure cleaning device in FIG, wherein the spray head is mounted on a base;

[0036] Figure 7 A perspective view of an alternative embodiment of a spray device comprising a base body, a spray head and a spray tube is shown, wherein no pump is arranged in the spray device. DETAILED DESCRIPTION

[0037] Figure 1 A pressure cleaning device 1 is shown. The pressure cleaning device 1 is used to spray a cleaning liquid which is put under pressure by the pressure cleaning device 1. The pressure cleaning device 1 comprises a spraying device 2. The spraying device 2 is manually guided when the pressure cleaning device 1 is used as intended. Figure 1 、 Figure 2 and Figure 6In the exemplary embodiment of FIG. 1 , the entire pressure cleaning device 1 can be guided by hand during intended use.

[0038] The pressure cleaning device 1 can expose the cleaning liquid to a pressure of at least 10 bar, in particular at least 15 bar, in particular at least 30 bar, and in particular at least 100 bar. In particular, the pressure cleaning device 1 can expose the cleaning liquid to a pressure of up to 600 bar, in particular up to 500 bar. In these embodiments, the pressure cleaning device 1 is a high-pressure cleaning device.

[0039] The spraying device 2 comprises a base 10, a spray head 20, and a nozzle 30. The base 10 particularly comprises a handle 11. The handle 11 allows a user to hold and guide the spraying device 2, particularly the pressure cleaning device 1, during use. An operating element 3 is arranged on the base 10. The operating element 3 allows the operator to influence, particularly control, the spraying of the cleaning liquid. In particular, by actuating the operating element 3, a valve can be opened, which then allows the cleaning liquid to flow through and spray the cleaning liquid. While holding the handle 11 with one hand, the operator can actuate the operating element 3 with the same hand, particularly with three fingers of the same hand.

[0040] The cleaning liquid can be sprayed through the spray head 20. For this purpose, the spray head 20 has a spray opening 21 ( Figure 2 The nozzle 30 may be arranged between the substrate 10 and the injection head 20 . Figure 1 and Figure 2 A spraying device 2 is shown which has a spray tube 30 arranged between a spray head 20 and a base body 10 . Figure 6 The use of the spraying device 2, in particular the pressure cleaning device 1, is shown without the nozzle 30. The spray head 20 can be arranged selectively, expediently, directly on the nozzle 30 or directly on the base body 10. When the spray head 20 is arranged directly on the base body 10, the pressure cleaning device 2 can be used without the nozzle 30.

[0041] As in Figure 2 As shown in FIG, the pressure cleaning device 1 comprises a basic connecting device 40. By means of the basic connecting device 40, the nozzle 30 can be releasably connected to the base body 10. Figure 1 and Figure 2 In the embodiment, the nozzle 30 is releasably connected to the base body 10 by means of a base connection device 40. The pressure cleaning device 1 comprises a head connection device 50. By means of the head connection device 50, the nozzle 30 can be releasably connected to the spray head 20. Figure 1 and Figure 2 In the embodiment, the nozzle tube 30 is detachably connected to the spray head 20 by means of a head connection device 50 .

[0042] Figure 1 and Figure 2The spray device 2 is shown in the extended position. In this extended position, the nozzle is arranged between the base body 10 and the spray head 20. Cleaning liquid can be conveyed from the base body 10 via the nozzle 30 to the spray opening 21 of the spray head 20. In particular, the cleaning liquid is guided directly into the nozzle 30. The nozzle 30 includes a channel formed by the inner wall of the nozzle 30. The cleaning liquid flows along the inner wall and comes into direct contact with it. In particular, no hose, separate from the nozzle 30, is provided for guiding the cleaning liquid.

[0043] In particular, the cleaning liquid flows through the base connection device 40 and the base connection device 40 itself seals the spraying device 2 towards the outside to prevent the cleaning liquid from escaping.

[0044] In particular, the cleaning liquid flows through the head connection device 50, and the head connection device 50 itself seals the spray device 2 outwardly to prevent the cleaning liquid from escaping.

[0045] Figure 6 The spray device 2 is shown in the short position. In this short position, the spray pipe 30 is removed. The spray head 20 is connected directly to the base body 10, in particular without an intermediate connection of the spray pipe 30. Cleaning liquid can be conveyed directly from the base body 10 into the spray head 20 and to the spray opening 21.

[0046] exist Figure 1 and Figure 2 The basic connection device 40 shown in the figure can be loosened using a basic release force. After loosening the basic connection device 40, the nozzle 30 can be separated from the base body 10. The nozzle 30 is then no longer connected to the base body 10. The basic connection device 40 can be loosened without tools. The basic release force can be applied by the user without any additional auxiliary means. The head connection device 50 can be loosened using a head release force. After loosening the head connection device 50, the spray head 20 can be separated from the nozzle 30. The spray head 20 is then no longer connected to the nozzle 30. The head connection device 50 can be loosened without tools. The head release force can be applied by the user without any additional auxiliary means. The basic release force and the head release force are not the same.

[0047] In particular, the larger of the two release forces is at least 105%, in particular at least 110% of the smaller release force. In these embodiments, the larger of the two release forces is at least 150% of the smaller release force.

[0048] The head release force is less than the base release force.

[0049] The spray device 2 can be configured to include at least a first spray head and a second spray head (not shown). The spray device 2 can then be selectively used with either the first spray head or the second spray head. The first spray head and the second spray head can have different characteristics. In particular, the first spray head and the second spray head can have different nozzles. For example, the first spray head can have a spot nozzle or a round nozzle, and the second spray head can have a flat nozzle.

[0050] Figure 3 A perspective view of a base connection device 40 or a head connection device 50 is shown as an example. Figure 3 In the drawings, at least two reference numerals are given to each component. The corresponding reference numerals are separated from each other by slashes. The first-mentioned reference numeral (or the first-mentioned reference numerals) respectively refers to the base connection device 40. The second-mentioned reference numeral respectively refers to the head connection device 50. Figure 4 and Figure 5 In the figure, the reference numerals are given in a similar manner. Figure 3 、 Figure 4 and Figure 5 First, the basic connection device 40 will be described. Therefore, only the reference numerals preceding the slash are relevant to this description.

[0051] As in Figure 3 As shown in FIG, the basic connecting device 40 includes a basic element 12 and a basic nozzle element 32. The basic element 12 is a part of the base body 10. The basic nozzle element 32 is a part of the nozzle 30. The basic element 12 corresponds to the basic nozzle element 32.

[0052] To establish the basic connection between the base body 10 and the nozzle 30, the base element 12 and the basic nozzle element 32 are joined to each other. In these embodiments, the base element 12 of the base body 10 forms the male part 43 of the basic connection device 40. The basic nozzle element 32 forms the female part 44 of the basic connection device 40. Figure 4 As shown in FIG, in these embodiments, the basic nozzle element 32 of the nozzle 30 is formed by at least one protrusion. Figure 2 , a longitudinal direction 100 is shown. The longitudinal direction 100 is the direction of the longitudinal extension of the nozzle 30. The longitudinal direction 100 corresponds to the spray direction in which the cleaning liquid is sprayed from the spray head 20. The basic nozzle element protrudes in a direction radial to the longitudinal direction 100. In these exemplary embodiments, two basic nozzle elements 32 are provided. The two basic nozzle elements 32 are arranged opposite each other in a direction transverse to the longitudinal direction 100, in particular, in a direction perpendicular to the longitudinal direction 100.

[0053] Figure 5The basic element 12 of the basic connecting device 40 is shown, which is constructed on the base body 10. The basic element 12 is a guide element for receiving and guiding the basic nozzle element 32. In these embodiments, the basic element 12 is a guide groove. However, it can also be provided that the basic element is a slit. The guide groove extends at least partially in a direction opposite to the longitudinal direction 100 from the edge of the basic element 12, and the basic nozzle element 32 is introduced into the basic element 12 from this edge. The part of the guide groove that extends in a direction opposite to the longitudinal direction 100 is called the longitudinal groove 13. The longitudinal groove 13 has an end 14 in a direction opposite to the longitudinal direction 100. A transverse groove 15 extends from the end 14 of the longitudinal groove 13. The transverse groove 15 is part of the guide groove of the basic element 12. The transverse groove 15 extends in a direction transverse to the longitudinal groove 13. As shown in Figure 2 As shown in FIG, the nozzle 30 has a longitudinal center axis 99. The longitudinal center axis 99 extends in a longitudinal direction 100. A circumferential direction 98 surrounds the longitudinal axis 99. Figure 5 The transverse groove 15 shown in FIG extends at least partially in the circumferential direction 98 around the longitudinal center axis 99. The transverse groove 15 extends in the circumferential direction 98 starting from the end 14 of the longitudinal groove 13. With respect to the longitudinal direction 100, the transverse groove 15 has a Figure 3 and Figure 5 16 . In the region of the latching recess 16 , the transverse groove 15 of the guide groove allows the base nozzle element 32 to be positioned further in the longitudinal direction 100 than in the remaining portion of the transverse groove 15 . The latching recess 16 extends only over a portion of the transverse groove 15 with respect to the circumferential direction 98 . When the base nozzle element 32 or the male part 43 of the base connecting device 40 is positioned with its projection in the latching recess 16 and rests therein, movement of the base nozzle element 32 with respect to the circumferential direction 98 in the direction of the longitudinal groove 13 is prevented.

[0054] As in Figure 2As shown in FIG, the spray device 2 includes a base fixing element 41. The base fixing element 41 is used to secure the base connecting device 40 against loosening. The base fixing element 41 acts in the longitudinal direction 100. When the base connecting device 40 is closed, the base fixing element 41 presses the base nozzle element 32 into the latching recess 16 of the guide groove. This prevents movement, particularly rotational movement, of the base nozzle element 32 in the circumferential direction 98, particularly about the longitudinal center axis 99. The base fixing element 41 presses the base body 10 and the nozzle 30 apart in the longitudinal direction 100. The base nozzle element 32 is secured in the base element 12. In these embodiments, the base fixing element 41 is a first spring. However, the base fixing force can also be provided in other ways. For example, this can be achieved through frictional forces acting between the base element and the base nozzle element when the base connecting device is connected. The base nozzle element and the base element then engage with each other in a frictional fit. The base fixing force can also be provided solely by frictional forces.

[0055] The basic release force for releasing the basic connecting device 40 acts in the longitudinal direction 100. In particular, the basic release force acts in the longitudinal direction 100 against the basic fixing force of the basic fixing element 41. In these embodiments, in order to release the basic connecting device 40, a basic release force to be applied in the longitudinal direction 100 is to be applied. Subsequently, a pivoting movement of the basic element 12 relative to the basic nozzle element 42 in the circumferential direction 98 is necessary so that the nozzle 30 can then be removed from the base body 10 by the relative movement of the basic element 12 and the basic nozzle element 32 in the longitudinal direction 100.

[0056] The basic connection device 40 comprises a bayonet connection. In these embodiments, the basic connection device 40 is a bayonet connection. The bayonet connection of the basic connection device 40 comprises a male part 43 and a female part 44.

[0057] The basic connection device 40 is designed so that it can be identified from the outside whether it is in the closed state or the open state. The basic connection device 40 is designed so that the protrusion of the basic nozzle element 32, in particular the male part 43, is visible from outside the basic connection device 40, in particular from outside the spray device 2, in particular from outside the pressure cleaning device 1 when the basic connection device 40 is in the closed state. A window 45 is provided on the basic element 12, in particular the female part 44, as shown in FIG. Figure 3. Window 45 is a notch through the outer wall of base element 12. When base connecting device 40 is in the closed position, the outer wall at least partially surrounds base lance element 32. When base connecting device 40 is in the closed position, the outer wall of base element 12 surrounds base lance element 32 in a closed manner, at least in sections, in circumferential direction 98. When base connecting device 40 is in the closed position, the projection of base lance element 32 is arranged in the region of window 45 in base element 12. The latching recess 16 of the guide groove is arranged in the region of window 45. In these embodiments, latching recess 16 forms an integral part of the edge boundary of window 45. Window 45 allows external identification of whether base lance element 32 is within base element 12 in the closed position of base connecting device 40. Window 45 also allows external identification of whether male component 43 is within female component 44 in the closed position.

[0058] The following should be based on Figures 3 to 5 The interaction of the head element 22 of the spray head 20 and the head nozzle element 52 of the nozzle 30 is described. Figures 3 to 5 The restatement of refers not to the base connection device 40 as before, but to the head connection device 50. The base connection device 40 and the head connection device 50 are largely similarly constructed in these embodiments. Figures 3 to 5 The following is used as an example to illustrate both the base connection device 40 and the head connection device 50. Figures 3 to 5 The numbers following the slash in the reference numerals are related to the following description of the head connection device 50.

[0059] As in Figure 3 As shown in FIG, the head connecting device 50 includes a head element 22 and a head nozzle element 52. The head element 22 is a part of the spray head 20. The head nozzle element 52 is a part of the nozzle 30. The head element 22 corresponds to the head nozzle element 52.

[0060] To establish the basic connection between the nozzle 30 and the spray head 20, the head element 22 and the head nozzle element 52 are joined to each other. In these embodiments, the head element 22 of the spray head 20 forms the male part 53 of the head connection device 50. The head nozzle element 52 forms the female part 54 of the head connection device 50. Figure 4 As shown in FIG, in these embodiments, the head nozzle element 52 of the nozzle 30 is formed by at least one protrusion. The head element 22 protrudes in a direction radial to the longitudinal direction 100. In these embodiments, two head elements 32 are provided. The two head elements 32 are arranged opposite each other in a direction transverse to the longitudinal direction 100, in particular in a direction perpendicular to the longitudinal direction 100.

[0061] Figure 5The head nozzle element 52 of the head connection device 50 is shown, which is configured at the injection head 20. The head nozzle element 52 is a guide element for receiving and guiding the head element 22. In these embodiments, the head nozzle element 52 is a guide groove. However, it can also be arranged that the head nozzle element is a slit. The guide groove extends at least partially in a direction opposite to the longitudinal direction 100 from the edge of the head nozzle element 52, and the head element 22 is introduced into the head nozzle element 52 from this edge. The part of the guide groove that extends in a direction opposite to the longitudinal direction 100 is called the longitudinal groove 63. The longitudinal groove 63 has an end 64 in a direction opposite to the longitudinal direction 100. A transverse groove 65 extends from the end 64 of the longitudinal groove 63. The transverse groove 65 is part of the guide groove of the head nozzle element 52. The transverse groove 65 extends in a direction transverse to the longitudinal groove 63. In Figure 5 The transverse groove 65 shown in FIG extends at least partially in the circumferential direction 98 around the longitudinal center axis 99. The transverse groove 65 extends in the circumferential direction 98 starting from the end 64 of the longitudinal groove 63. With respect to the longitudinal direction 100, the transverse groove 65 has a Figure 3 and Figure 5 6. In the region of the latching recess 66, the transverse groove 65 of the guide groove allows the head element 22 to be positioned further in the longitudinal direction 100 than in the remaining portion of the transverse groove 65. The latching recess 66 extends only over a portion of the transverse groove 65 with respect to the circumferential direction 98. When the head element 22 or the male component 43 of the base connecting device 50 is positioned with its projection in the latching recess 66 and abuts against it, movement of the head element 22 with respect to the circumferential direction 98 in the direction of the longitudinal groove 63 is prevented.

[0062] As in Figure 2 As shown in FIG, the spray device 2 includes a head fixing element 51. The head fixing element 51 is used to secure the head connection device 50 to prevent it from becoming loose. The head fixing element 51 acts in the longitudinal direction 100. When the head connection device 50 is closed, the head fixing element 51 presses the head nozzle element 52 into the latching recess 66 of the guide groove. This prevents movement of the head element 22 in the circumferential direction 98, in particular about the longitudinal center axis 99, in particular rotational movement. The head fixing element 51 presses the nozzle 30 and the spray head 20 apart from each other in the longitudinal direction 100. The head element 22 is fixed in the head nozzle element 52. In these exemplary embodiments, the head fixing element 51 is a second spring.

[0063] The head-releasing force for releasing the head connection device 50 acts in the longitudinal direction 100. In particular, the head-releasing force acts in the longitudinal direction 100 against the head-securing force of the head-securing element 51. In these embodiments, in order to release the head connection device 50, a head-releasing force to be applied in the longitudinal direction 100 should be applied. Subsequently, a pivoting movement of the head element 22 relative to the head nozzle element 52 in the circumferential direction 98 is necessary so that the spray head 20 can then be removed from the nozzle 30 by the relative movement of the head element 22 and the head nozzle element 52 in the longitudinal direction 100.

[0064] However, it is also possible to provide the head-fixing force in other ways. For example, this can be achieved by frictional forces acting between the head element and the head nozzle element when the head connection device is in the connected state. The base nozzle element and the base element then engage with each other in a friction fit. It is also possible to provide the head-fixing force solely by frictional forces. In such an embodiment, the head-fixing force and the base-fixing force are also not of the same magnitude. In particular, the base-fixing force is greater than the head-fixing force, in particular by the percentage relationship previously mentioned for the head release force and the base release force.

[0065] The head connection device 50 comprises a bayonet connection. In these embodiments, the head connection device 50 is a bayonet connection. The bayonet connection of the head connection device 50 comprises a male part 53 and a female part 54.

[0066] The head connection device 50 is designed so that it can be identified from the outside whether it is in the closed state or the open state. The head connection device 50 is designed so that the protrusion of the head element 22, in particular the male part 53, is visible from outside the head connection device 50, in particular from outside the spray device 2, in particular from outside the pressure cleaning device 1, when the head connection device 50 is in the closed state. A window 55 is provided on the head nozzle element 32, in particular the female part 54, as shown in FIG. Figure 3 . Window 55 is a notch through the outer wall of the head nozzle element 52. When the head connection device 50 is in the closed position, the outer wall at least partially surrounds the head element 22. When the head connection device 50 is in the closed position, the outer wall of the head nozzle element 32 surrounds the head element 22 in a closed manner, at least in sections, in the circumferential direction 98. When the head connection device 50 is in the closed position, the projection of the head element 22 is arranged in the region of the window 55 of the head nozzle element 52. The latching recess 66 of the guide groove is arranged in the region of the window 55. In these embodiments, the latching recess 66 is an integral part of the edge boundary of the window 55. Through the window 55, it is possible to externally identify whether the head element 22 is located within the head nozzle element 32 in the closed position. Through the window 55, it is possible to externally identify whether the male part 53 is located within the female part 54 in the closed position.

[0067] The head loosening force should be resisted by Figure 2 The basic loosening force should be applied against the basic fixing force provided by the base fixing element 41. The basic loosening force to be applied to loosen the base connection device 40 is at least as great as the basic fixing force. It can also be arranged so that the basic loosening force corresponds to the basic fixing force. The head loosening force to be applied to loosen the head connection device 50 is at least as great as the head fixing force. It can also be arranged so that the head loosening force corresponds to the head fixing force.

[0068] The first spring (which forms the base fixing element 41) and the second spring (which forms the head fixing element 51) have different spring hardnesses. The spring hardness of the first spring is greater than the spring hardness of the second spring. In particular, the spring hardness of the first spring is at least 105%, in particular at least 120%, and even more particularly at least 150% of the spring hardness of the second spring.

[0069] Figure 6 The spray device 2 or the pressure cleaning device 1 is shown in the short state. In the short state, the spray device 2 can be used without the nozzle 30. The spray device 2 is designed so that the spray head 20 can be fastened directly to the base body 10 without the intermediate connection nozzle 30. This achieves a direct connection between the base body 10 and the spray head 20. The direct connection can be established by the interaction of the head element 22 of the head connection device 50 and the base element 12 of the base connection device 40. The head element 22 of the head connection device 50 corresponds to the base element 12 of the base connection device 40. Figures 3 to 5 In a similar manner to that described for the base connection 40 and the head connection 50, the projections of the head element 22 can be introduced into guide grooves of the base element 12 and fixed there, in particular by means of the base fixing element 41. The head element 22 and the base element 12 also together form a bayonet connection.

[0070] In the case of the injection device 2 Figure 1 The long state shown in FIG transitions to the injection device 2 in Figure 6In the short state shown in FIG, the spray head 20 is first removed from the nozzle 30. To do this, the head connection device 50 is released. First, the head-fixing force of the head fixing element 51 must be overcome. This is achieved by the user applying a head-releasing force. With the help of the head-releasing force, the head element 22 is moved against the longitudinal direction 10 toward the head nozzle element 52. Here, the head fixing element 51, which is configured as a second spring, is compressed. The protrusion of the head element 22 is moved out of the latching recess 66 of the head nozzle element 52. The head element 22 can then be moved in the guide groove in the circumferential direction 98. The head element 22 is pivoted relative to the head nozzle element 52 in the circumferential direction 98 and then removed from the head nozzle element 52 in the longitudinal direction 100. Here, the protrusion of the head element 22 is moved in the guide groove of the head nozzle element 52 first in the circumferential direction 98 and then in the longitudinal direction 100. After the spray head 20 is removed from the nozzle tube 30, the nozzle tube 30 is similarly removed from the base 10. Because the head release force is less than the base release force, there is no risk of the nozzle tube 30 becoming loose from the base 1 before the spray head 20 is released from the nozzle tube 30. The user will initially apply only enough force to release the head connection 50. Then, when releasing the nozzle tube 30 from the base 10, the user will apply more force to release the base connection 40.

[0071] When replacing the first spray head with the second spray head, it is likewise reliably prevented that the spray tube becomes accidentally detached from the base body, rather than the spray head becoming detached from the spray tube.

[0072] Figure 7 An alternative embodiment for the injection device 2 is shown. Figure 7 The spraying device 2 shown in FIG is a component of a pressure cleaning device in which a pump is not integrated into the spraying device 2 but is fluidically connected to the spraying device 2 via a feed line. Figure 7 The spraying device 2 also includes a base 10, a nozzle 30 and a spray head 20. Figure 7 The spraying device 2 also has a handle 11. In addition to the arrangement of the pump, Figures 1 to 6 The previous description of the previous embodiment of the invention is transferred in an analogous manner to the invention according to Figure 7 A pressure cleaning device with a spray device 2.

Claims

1. A spraying device for a pressure cleaning device (1), wherein: The injection device comprises: - a base body (10), a spray head (20) with a spray opening (21) through which the cleaning liquid can be sprayed, a nozzle (30) which can be arranged between the base body (10) and the spray head (20), a basic connecting device (40), by means of which the nozzle tube (30) can be releasably connected to the base body (10), and a head connection device (50), by means of which the nozzle tube (30) can be releasably connected to the spray head (20), wherein the cleaning liquid can be conveyed from the base body (10) to the spray opening (21), The invention is characterized in that the basic connection device (40) can be loosened by using a basic loosening force, the head connection device (50) can be loosened by using a head loosening force, and the basic loosening force and the head loosening force are different in size.

2. The spraying device according to claim 1, It is characterized by: The head release force is less than the base release force.

3. The spraying device according to claim 1, It is characterized by: The spraying device (2) includes at least a first spraying head and a second spraying head, the spraying device (2) can be selectively used with the first spraying head or the second spraying head, and the first spraying head and the second spraying head have different characteristics.

4. The spraying device according to claim 1, It is characterized by: The basic connection device (40) includes a basic element (12) at the base (10) and a basic nozzle element (32) at the nozzle (30), and the head connection device (50) includes a head element (22) at the injection head (20) and a head nozzle element (52) at the nozzle (30).

5. The spraying device according to claim 1, It is characterized by: The spraying device (2) is designed in such a way that the spray head (20) can be fastened directly to the base body (10) without the intermediate connection of the nozzle tube (30).

6. The spraying device according to claim 1, It is characterized by: The base connection device (40) and / or the head connection device (50) comprises a bayonet connection.

7. The spraying device according to claim 1, It is characterized by: The spraying device (2) includes a base fixing element (41) for fixing the base connecting device (40) to prevent it from being loosened, and / or the spraying device (2) includes a head fixing element (51) for fixing the head connecting device (50) to prevent it from being loosened.

8. The spraying device according to claim 7, It is characterized by: The base fixing element (41) is a first spring, and the head fixing element (51) is a second spring.

9. The spraying device according to claim 8, It is characterized by: The first spring and the second spring have different spring hardnesses.

10. The spraying device according to claim 9, It is characterized by: The spring hardness of the first spring is greater than the spring hardness of the second spring.

11. The spraying device according to claim 7, It is characterized by: The nozzle tube (30) extends in a longitudinal direction (100) from the base body (10) to the spray head (20), and the base fixing element (41) and / or the head fixing element (51) act in the longitudinal direction (100).

12. The spraying device according to claim 11, It is characterized by: The base connection device (40) and / or the head connection device (50) include a bayonet connection, the base fixing element (41) presses the base body (10) and the nozzle (30) apart from each other in the longitudinal direction (100), and / or the head fixing element (51) presses the nozzle (30) and the injection head (20) apart from each other in the longitudinal direction (100).

13. The spraying device according to claim 1, It is characterized by: The base connection device (40) and / or the head connection device (50) are designed in such a way that it can be identified from the outside whether they are in a closed state or an open state.

14. The spraying device according to claim 13, It is characterized by: The base connection device (40) and / or the head connection device (50) comprises a bayonet connection having a male part (43, 53) and a female part (44, 54), and a window (45, 55) is provided on the female part (44, 54), so that it can be recognized from the outside whether the male part (43, 53) is located in the female part (44, 54) in the closed position.

15. A pressure cleaning appliance comprising a spraying device (2) according to claim 1.

16. A base body (10) or a spray head (20) or a nozzle tube (30) for a spraying device (2) according to claim 1 or for a pressure cleaning device (1) according to claim 15.

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