CN108698055B

CN108698055B - Valve gun for high-pressure cleaning equipment

Info

Publication number: CN108698055B
Application number: CN201680078919.XA
Authority: CN
Inventors: 克里斯多佛·布罗伊尔; 丹尼尔·克内德勒
Original assignee: Alfred Kaercher SE and Co KG
Current assignee: Alfred Kaercher SE and Co KG
Priority date: 2016-03-23
Filing date: 2016-03-23
Publication date: 2021-12-10
Anticipated expiration: 2036-03-23
Also published as: EP3433023A1; CN108698055A; DK3433023T3; EP3433023B1; WO2017162282A1

Abstract

The invention relates to a valve gun for a high-pressure cleaning device, comprising a valve (24) having a closure body (42) which is arranged on a valve tappet (44) and bears tightly against a valve seat (40) in a closed position and which can be moved into an open position spaced apart from the valve seat (40) by pivoting a release lever (52; 202) which is mounted pivotably about a first pivot axis (66), wherein the release lever (52; 202) assumes a rest position in the closed position of the closure body (42) and a release position in the open position of the closure body (42) and is mechanically coupled to the valve tappet (44) via a coupling lever (54; 216) which is mounted pivotably about a second pivot axis (86), wherein a pivoting movement of the release lever (52; 202) can be transmitted to a coupling member (74; 154; 208; 260) which can be moved along a guide track (94; 152; 212; 252) via a coupling member (74; 154; 208; 260) which can be moved along the guide track (94; 152) The rod (54; 216) and the guide track (94; 152; 212; 252) has a first end section (96; 160; 218; 254), an intermediate section (98; 162; 220; 256) and a second end section (100; 164; 222; 258). In order to improve the valve gun such that it has a simpler structural design and can therefore be easily handled by a user, the coupling link (74; 154; 208; 260) can be moved along the first end section (96; 160; 218; 254), subsequently along the intermediate section (98; 162; 220; 256) and subsequently along the second end section (100; 164; 222; 258) when the release lever (52; 202) is pivoted from the rest position into the release position, and the first end section (96; 160; 218; 254) has a smaller inclination relative to the pivoting direction of the release lever (52; 202) than the intermediate section (98; 162; 220; 258).

Description

Valve gun for high-pressure cleaning equipment

Technical Field

The invention relates to a valve gun for a high-pressure cleaning device for discharging cleaning liquid, having a housing and a valve arranged in the housing, having a closure body which is arranged on a valve tappet and bears tightly against a valve seat in a closed position, and being movable by pivoting of a release lever which is pivotably mounted about a first pivot axis on a bearing point into an open position spaced apart from the valve seat against the pressure of the cleaning liquid on the closure body, wherein the release lever occupies a rest position in the closed position of the closure body and a release position in the open position of the closure body and is mechanically coupled to the valve tappet via a coupling lever which is pivotably mounted about a second pivot axis, wherein the pivoting movement of the release lever can be transmitted to the coupling lever via a coupling link which is movable along a guide track, and the guide track has a first end section, An intermediate section and a second end section.

Background

By means of such a valve tappet, the discharge of cleaning liquid, which is put under pressure by the high-pressure cleaning device, can be controlled. The valve tappet has a valve with an inlet and an outlet. A pressure hose can be connected to the inlet, for example, and a spray gun can be connected to the outlet, for example. The valve tappet is supplied with pressurized cleaning liquid via a pressure hose and can direct the liquid towards the object via the spray gun. In order to control the liquid discharge, it is possible for the user to pivot the release lever from the rest position into the release position. For this purpose, the release lever is mounted on the bearing point so as to be pivotable about a first pivot axis. The release lever is mechanically coupled to a valve tappet, on which a valve closing body is arranged, via a coupling lever. The valve tappet can be connected in one piece with the pipe wall body, but can also be two separate components. Starting from a closed position, in which the closing body bears tightly against the valve seat, the closing body can be moved into an open position, which is spaced apart from the valve seat, by pivoting the release lever, wherein the closing body is moved from the closed position into the open position against the pressure of the cleaning liquid acting on the closing body.

The pivoting movement of the release lever is transmitted to the valve tappet, on which the closing body of the valve is arranged, via a coupling lever which is mounted so as to be pivotable about a pivot axis. The transmission of the pivoting movement from the release lever to the coupling lever takes place via a coupling link which can be moved along the guide track by pivoting the release lever. The guide track has a first end section, an intermediate section and a second end section. If the release lever is pivoted from the rest position into the release position, the coupling link moves along the guide track, and this in turn results in the coupling lever also performing a pivoting movement and thus the valve tappet being moved.

In addition to the pressure of the cleaning liquid, the force of the return spring of the valve normally acts on the closing body, which ensures that, after the liquid discharge has taken place, the closing body automatically takes up its closed position again as soon as the release lever is released by the user. In order to open the valve, a considerable force must therefore be exerted on the closing body.

In EP 1389495 a1 a valve gun is disclosed, in which the operating force necessary for opening the valve is reduced by: the piston, against which the pressure of the cleaning liquid present upstream of the valve seat acts, bears against the release lever. The piston can be displaced in the channel and is mounted in a sealing manner.

In WO 2015/086085a1, a valve gun is disclosed in which a release lever is mechanically coupled to a coupling lever via two coupling links, wherein the two coupling links contact different sections of a guide rail one after the other during a pivoting movement of the release lever. The first coupling link in this case has a greater spacing than the pivot axis of the second coupling link pitch coupling rod. This has the following advantages: the lever ratio of the coupling lever changes when the release lever is transferred from the rest position to the release position. In the first phase of the transfer, a large opening force can be applied to the valve tappet because of the advantageous lever ratio resulting from the large spacing between the first coupling part and the pivot axis of the coupling lever, even in the case of a user loading the release lever with only a comparatively small operating force. The large distance between the first coupling element and the pivot axis of the coupling lever results in that only a small stroke of the valve tappet, i.e. only a comparatively small displacement path of the valve tappet, can be reached during the first phase of the pivoting movement of the release lever. In the second phase of the pivoting movement of the release lever, the coupling between the release lever and the coupling lever then takes place via a second coupling link, the pivot axes of which are at a smaller distance from one another. The smaller distance of the second coupling element results in that, when the release lever is pivoted further, a greater travel of the valve tappet can be achieved, so that the closing body can be transported with a greater distance from the valve seat.

The use of two coupling links which are used one after the other when the release lever is pivoted from the rest position into the release position thus makes the valve gun easier to handle. However, this requires a certain structural overhead.

Disclosure of Invention

The object of the present invention is to improve a valve gun of the type mentioned at the outset such that it has a comparatively simple construction and can therefore be operated by the user in a simple manner to open the valve.

This object is achieved according to the invention in a valve gun of this type by: the coupling link can be moved along the first end section, then along the intermediate section and then along the second end section when the release lever is pivoted out of the rest position into the release position, wherein the first end section has a smaller inclination relative to the pivoting direction of the release lever than the intermediate section.

The pivoting direction of the release lever follows an imaginary circular arc, the center point of which corresponds to the bearing point of the release lever and the radius of which corresponds to the distance between the contact point on the coupling link and the first end section of the guide rail and the bearing point of the release lever.

In the valve gun according to the invention, the mechanical coupling between the release lever and the coupling lever is realized via a coupling link which, when the release lever is pivoted from the rest position into the release position, is moved from the first end section of the guide track via the intermediate section to the second end section of the guide track. Via the coupling link and the guide track, the pivoting movement of the release lever is transmitted to a coupling lever, which in turn exerts an opening force on the valve tappet, under which opening force the closing body of the valve, which is arranged on the valve tappet, is moved from the closed position into the open position.

In order to reduce the operating force taken by the user to open the valve, in the valve gun according to the invention the first end section of the guide track is less inclined with respect to the pivoting direction of the release lever than the intermediate section. The smaller inclination of the first end section relative to the pivoting direction of the release lever results in: the coupling lever initially changes its pivot position only slightly upon just pivoting the release lever from the rest position, i.e. a change in the pivot angle of the release lever initially causes only a small change in the pivot angle of the coupling lever. However, a small change in the pivoting angle of the coupling rod also causes a change in the position of the closing body, so that the closing body lifts off the valve seat even if the position change is slight and the pressure of the cleaning liquid present upstream of the valve seat thus drops slightly. When the release lever is pivoted further into the release position, the coupling link reaches the middle section of the guide track. Since the intermediate section has a stronger inclination relative to the pivoting direction of the release lever than the first end section, the intermediate section is then more strongly inclined relative to the imaginary circular arc mentioned above, which results in: a significant change in the pivot angle of the coupling lever and thus also in the position of the closing body can be achieved by a comparatively small change in the pivot angle of the release lever. However, strong positional changes occur at the following points in time: at this point in time, the pressure of the cleaning liquid present upstream of the valve seat has already decreased significantly, so that a change in position can be achieved with comparatively little force.

The small inclination of the first end section of the guide track with respect to the pivoting direction of the release lever and thus with respect to the imaginary arc of a circle as explained above makes it easy for the user to manipulate the valve gun when opening the valve. A comparatively simple construction of the valve gun can be achieved in this case using a coupling link which contacts the guide track during the entire pivoting movement of the release lever from the rest position to the release position.

It is particularly advantageous if the second end section of the guide rail has a smaller inclination relative to the pivoting direction of the release lever than the middle section. As already explained, the relationship between the change in the pivot angle of the release lever and the change in the pivot angle of the coupling lever is predetermined by the inclination of the section of the guide track relative to the pivot direction of the release lever and thus relative to the imaginary circular arc explained above. The greater the inclination, the greater the change in the pivoting angle of the coupling lever, which can be achieved by a change in the pivoting angle of the release lever. The small inclination results in: the change in the pivot angle of the release lever only slightly affects the change in the pivot angle of the coupling lever. Furthermore, a small inclination leads to: the force exerted by the coupling lever on the release lever is oriented substantially radially with respect to the imaginary circular arc set forth above, that is to say the force is directed substantially towards the bearing point of the release lever and is not substantially parallel to the pivoting direction of the release lever. If the second end section of the guide track has a small inclination with respect to the pivoting direction of the release lever and thus with respect to the imaginary circular arc, the force of the cleaning liquid and of the return spring of the valve acting on the closing body in the open position of the valve is transmitted to the release lever via the coupling lever substantially in the radial direction with respect to the imaginary circular arc, so that the user only has to spend a small force holding the release lever in the release position.

It is conceivable for the second end section of the guide track to be oriented parallel to the pivoting direction of the release lever, i.e. tangentially to the imaginary arc explained above. This orientation of the second end section enables the coupling rod to be supported on the release lever in the open position of the valve in the radial direction via the coupling link and the second end section relative to the imaginary circular arc. The force exerted by the user in the release position of the release lever can be kept particularly small in the following manner. In an advantageous embodiment of the invention, the first end section and/or the intermediate section and/or the second end section are/is straight, at least in regions.

The transition from the first end section to the middle section of the guide rail and/or the transition from the middle section to the second end section of the guide rail is advantageously curved, so that the first end section continuously transitions into the middle end and/or the middle section continuously transitions into the second end section. This makes the manipulation of the valve gun easy.

In an advantageous embodiment of the invention, the coupling element is arranged on the release lever and the guide track is arranged on the coupling lever.

Advantageously, the coupling link is arranged on an end side of the release lever facing away from the first pivot axis.

In a further advantageous embodiment of the invention, the coupling element is arranged on the coupling lever and the guide track is arranged on the release lever.

Advantageously, the guide track is arranged on an end side of the release lever facing away from the first pivot axis.

The coupling links are preferably designed as freely rotatable coupling rollers. The coupling roller can in this case be designed in the form of a single roller or double roller. The double roller can have two roller bodies oriented parallel to one another, which are mounted so as to be freely rotatable about a common axis of rotation. In particular, it can be provided that a support body is arranged between the two roller bodies, on which support body the two roller bodies are mounted so as to be freely rotatable about a common axis of rotation.

The support body is advantageously connected integrally to the release lever or integrally to the coupling lever.

Alternatively, it can be provided, for example, that the coupling element is designed as a coupling cam which projects from the release lever or the coupling lever. Preferably, the coupling cam is integrally connected with the coupling lever or the release lever.

It can be provided that a coupling element, which can be designed in particular as a freely rotatable coupling roller, is arranged on the end of the coupling rod facing away from the valve.

In a particularly preferred embodiment of the invention, the valve has a valve inlet and a valve outlet, wherein the valve inlet projects from a front side of a housing of the valve gun, and the housing has a handle that can be gripped by a user with his hand, wherein the release lever projects in its rest position from a rear side of the handle facing away from the valve outlet. In this embodiment of the valve gun according to the invention, the user can actuate the release lever with his thumb and carpus. If the cleaning liquid under pressure is discharged by the valve gun, the cleaning liquid exerts a back-wash on the valve gun. The positioning of the release lever on the rear side of the handle facing away from the valve outlet results in the valve gun being pressed against the user's thumb under the influence of the back-flushing of the cleaning liquid. The user's ball of the thumb thus functions in the manner of a thrust bearing, on which the valve gun is supported. The user's finger is thereby relieved.

Advantageously, the housing of the valve gun has a handle which can be gripped by a hand of a user and which projects from a front, central or rearward region of the housing, and the first pivot axis is arranged in an end region of the handle facing away from the front, central or rearward region of the housing.

The housing of the valve gun advantageously has two housing shells on which the release lever is pivotably mounted about a first pivot axis.

In an advantageous embodiment of the invention, the coupling lever is mounted on the valve housing so as to be pivotable about the second pivot axis.

Drawings

The following description of advantageous embodiments of the invention is provided in conjunction with the accompanying drawings for the purpose of detailed description. Shown in the drawings are:

FIG. 1: front view of a first advantageous embodiment of the valve gun according to the invention;

FIG. 2: a schematic cross-sectional view of the valve gun along line 2-2 of FIG. 1;

FIG. 3: a schematic cross-sectional view of a second advantageous embodiment of the valve gun according to the invention;

FIG. 4: a schematic cross-sectional view of a third advantageous embodiment of the valve gun according to the invention;

FIG. 5: a schematic cross-sectional view of a fourth advantageous embodiment of the valve gun according to the invention.

Detailed Description

A first advantageous embodiment of the valve gun according to the invention is shown schematically in fig. 1 and 2 and is generally designated by the reference numeral 10. Valve gun 10 includes a housing 12 formed from a first housing shell 14 and a second housing shell 16. The housing 12 has a central housing region 18, which is arranged between a front housing region 20 and a rear housing region 22.

The front housing area 20 accommodates a valve 24 having a valve housing 26. The valve housing 26 has a valve inlet 28 and a valve outlet 30. The valve outlet 30 in the illustrated embodiment extends from a front side 32 of the housing 12. A spray gun, for example, can be connected to the valve outlet 30. A liquid supply line, for example a pressure hose, can be connected to the valve inlet 28, which in the exemplary embodiment shown can be introduced into the housing 12 via a hose inlet opening 34. Hose inlet opening 34 is provided on an underside 36 of housing 12.

The valve inlet 28 is connected to the valve outlet 30 via a flow passage 38. The flow channel 38 forms a valve seat 40 in the embodiment shown, against which a closing body 42 can bear in a tight manner. The closing body 42 is held on a valve tappet 44 which projects from the valve housing 26 with an end region 46 facing away from the closing body 28 and which projects into the flow channel 38 and is mounted so as to be movable on the valve housing 26. Spaced apart from the valve housing 26, a spring retainer 48 is fastened to the end region 46 of the valve tappet 44. A first restoring spring 50 is interposed between the spring holder 48 and the valve housing 26, which spring acts on the valve tappet 44, under the effect of which spring force the closing body 42 assumes the closed position, in which it bears tightly against the valve seat. By displacing the valve tappet 44 against the force of the first restoring spring 50, the closing body 42 can be moved into an open position, in which it is at a distance from the valve seat 40 and thus releases the flow path between the valve inlet 28 and the valve outlet 30.

To operate the valve 24, the valve gun 10 has a release lever 52 which is mechanically coupled to the valve tappet 44 via a coupling lever 54. The release lever 52 is arranged in a handle 56 which projects from the rearward housing region 22. In the exemplary embodiment shown, the protective bow 58 extends from an end region 60 of the handle 56 facing away from the rearward housing region 22 to the forward housing region 20. The protective bow 58, the central housing region 18 and the handle 56 enclose a grip-in opening 62, into which a user can grip his fingers.

The release lever 52 is mounted on the two

housing shells

14, 16 at a mounting point 64 so as to be pivotable about a first pivot axis 66. The handle 56 has a handle opening 68 on its rear side facing away from the valve 24, through which the release lever 52 projects from the housing 12 with an actuating surface 70. On its end face 72 facing away from the first pivot axis 66 and thus from the bearing 64, the release lever 52 carries a coupling element 74, which in the first exemplary embodiment shown in fig. 1 and 2 is designed as a freely rotatable coupling roller 76.

The release lever 52 carries a retaining pin 80 on its front side 78 facing away from the operating surface 70, on which retaining pin a second return spring 82 is fastened, which is supported on one side on the retaining pin 80 and on the other side on a spring receptacle 84 of the housing 12. The second return spring 82 exerts a return force on the release lever, with which the release lever is pivoted into the rest position shown in fig. 2.

The coupling lever 54 is arranged in the central housing region 18 and can pivot about the second pivot axis 86. In the embodiment shown, the coupling rod is supported on the valve housing 26. However, the coupling lever can also be mounted pivotably on the

housing halves

14, 16 of the housing 12. The second pivot axis 86 is oriented parallel to the first pivot axis 66. At a small distance from the second pivot axis 86, the coupling lever 54 has an adjustable force application element 90 at its front end 88 facing away from the release lever 52, which element bears against the end of the valve tappet 44 projecting from the valve housing 26. The coupling lever 54 has, on its rear end 92 facing the release lever 52, a guide track 94 facing the release lever 52, along which the coupling roller 76 moves when the release lever 52 is pivoted. The guide track 94 has a first end section 96, an intermediate section 98 and a second end section 100. In the rest position of the release lever 52 shown in fig. 2, the coupling roller 76 bears against the first end section 96 or is at a small distance from the end section 96. The spacing may be less than 3mm, for example. It is possible for the user to grasp the grip 56 with his hand, with the operating face 70 of the release lever 52 abutting the palm of the user's thumb. This gives the user the possibility of swinging the release lever 52 with the ball of the thumb forward from its rest position shown in fig. 2 against the action of the second restoring spring 82 into a release position not shown in this illustration. As soon as the coupling roller has previously been spaced a small distance from the end section 96, the coupling roller 76 touches the end section 96 as a result of the pivoting movement of the release lever 52. Further pivotal movement of the release lever 52 causes the linkage roller 76 to move from the first end section 96, via the intermediate section 98, to the second end section 100. The pivoting movement of the release lever 52 is transmitted via the coupling roller 76 and the guide track 94 to the coupling lever 54, so that the coupling lever swivels about the second pivot axis 86. This in turn leads to: the valve tappet is displaced counter to the restoring force of the first restoring spring 50 and the closing body 42 thereby assumes its open position spaced apart from the valve seat 40.

The pivoting movement of the release lever 52 is illustrated in fig. 2 by an imaginary circular arc 104, the radius of which corresponds to the spacing, at which the contact point of the coupling roller 76 at the first end section 96 has a distance from the bearing point 64, and the center of which is the bearing point 64 of the release lever 52.

As can be seen directly in fig. 2, the first end portion 96 is inclined only slightly with respect to the pivoting direction of the release lever 52 and therefore with respect to the imaginary circular arc 102, while the inclination of the intermediate portion 98 with respect to the pivoting direction of the release lever and therefore with respect to the imaginary circular arc 102 is selected to be significantly greater. The inclination of the second end section 100 is in turn significantly smaller than the inclination of the intermediate section 98 with respect to the pivoting direction of the release lever 52. In particular, it can be provided that the inclination of the second end portion 100 relative to the pivoting direction of the release lever 52 is selected to be as great as the inclination of the first end portion 56 relative to the pivoting direction of the release lever 52 (imaginary circular arc 102).

If the release lever 52 is moved from its rest position shown in fig. 2 into its release position, the pivot angle position of the coupling lever 54 changes due to the first end section 96 having a small inclination from the pivot direction of the release lever 52, first only slightly when the coupling roller 76 moves along the intermediate section 98, in order then to make a significant pivot angle change when the release lever is swiveled further. If the coupling roller 76 reaches the second end section 100, the ending pivoting movement of the release lever 52 causes only a small pivoting angle change of the coupling lever 54, since the second end section 100 also has a small inclination with respect to the pivoting direction of the release lever 52.

As soon as the coupling roller 76 moves along the first end section 96 of the guide track 94, the small pivoting angle change effected by the coupling rod 54 results in the closing body 52 being lifted slightly off the valve seat 40, so that the pressure of the cleaning liquid existing upstream of the valve seat 40 is reduced. The movement of the coupling roller 76 along the intermediate section 98 of the guide track 94 then causes a strong pivoting angle change of the coupling lever 54 and thus a significant movement of the closing body 42 towards its open position. The closing body 42 thus completely releases the valve seat 40 so that cleaning liquid can flow from the valve inlet 28 to the valve outlet 30. If the coupling roller 76 reaches the second end section 100, a further pivoting movement of the release lever 52 causes only a slight pivoting movement of the coupling lever 54, so that the closing body 42 is moved only slightly further.

In the open position of the closing body, the coupling roller 76 bears against the second end section 100 of the guide track 94. The closing body 42 is loaded in the open position with force towards its closed position by a first return spring 50. In order to hold the closing body 42 in its open position, the closing body 42 must therefore be loaded by the coupling rod 54 via the valve tappet 44 in order to retain the force. The coupling lever 54 is supported on the release lever 52 via the second end section 100 of the guide track 94 and the coupling roller 76. The release lever 52 is in this case loaded by the coupling lever 54 with a force which is oriented substantially radially with respect to the imaginary circular arc 102. This allows the user to hold the release lever 52 with little force in its release position in which the closing body 42 occupies its open position.

If the closing body 42 again has to assume its closed position, so that the flow connection between the valve inlet 28 and the valve outlet 30 is interrupted, the user merely has to release the release lever 52 for this purpose. Under the action of the second return spring 82, the release lever 52 is then pivoted into its rest position shown in fig. 2, in which the coupling roller 76 is moved from the second end section 100 of the guide track 94 via the intermediate section 98 to the first end section 96.

The small inclination of the first end section 96 and the second end section 100 of the guide track 94 relative to the pivoting direction of the release lever 52 makes it easy for a user to manipulate the valve gun 10. Valve gun 10 can be operated with relatively low force.

Fig. 3 schematically shows a second advantageous embodiment of the valve gun according to the invention and is generally designated by reference numeral 150. The valve gun 150 shown in fig. 3 is designed as identically as possible to the valve gun 10 shown in fig. 1 and 2, like the

valve guns

200 and 250 described in detail below with reference to fig. 4 and 5. Identical components are therefore denoted by the same reference numerals as in fig. 1 and 2 in fig. 3, 4 and 5 and, to avoid repetition, reference is made to the preceding explanations with regard to these components.

The valve gun 150 shown in fig. 3 differs from the valve gun 10 shown in fig. 1 and 2 in that instead of the coupling link 74, a guide track 152 is provided on the end face 72 of the release lever 52, and instead of the guide track 94, a coupling link 154 in the form of a coupling roller 156 is mounted on the rear end 92 of the coupling lever 54 in a freely rotatable manner.

The pivoting direction of the release lever 52 is illustrated in the valve gun 150 shown in fig. 3 by an imaginary circular arc 158, the circular center of which coincides with the bearing point 64 of the release lever 52. The radius of the imaginary circular arc 158 corresponds to the distance between the contact point of the coupling link 154 on the first end section 160 of the guide track 152 and the bearing point 64.

In the rest position of the release lever 52 shown in fig. 3, the coupling element 154 rests against the first end section 160 of the guide rail 152 or is at a small distance from the end section 160. In addition to the first end section 160, the guide rail 152 has an intermediate section 162 and a second end section 164. In a corresponding manner as in valve gun 10, first end section 160 of guide rail 152 is also less inclined relative to the pivoting direction of release lever 52 than intermediate section 162 and second end section 164 is less inclined relative to release lever 52 than intermediate section 162. As long as the coupling link 154 rests against the first end section 160 or against the second end section 164, the pivot angle change of the release lever 52 causes only a small pivot angle change of the coupling lever 54. However, if the coupling link 154 abuts against the intermediate section 162, the pivoting angle of the release lever 52 changes, resulting in a significant pivoting angle change of the coupling lever 54.

The small inclination of the

end sections

160, 164 relative to the pivoting direction of the release lever 52 and the significant inclination of the intermediate section 162 relative to the pivoting direction of the release lever 52 also contribute to a simple operation in the valve gun 150.

A third advantageous embodiment of the valve gun according to the invention is shown schematically in fig. 4 and is generally designated by reference numeral 200. The valve gun 200 shown in fig. 4 differs from the previously described

valve guns

10 and 150 in that instead of the release lever 52, a release lever 202 is used, the release lever 52 with its operating surface 70 protruding from the rear-side handle opening 68, and the release lever 202 with its front operating surface 204 protruding from the front handle opening 206 and being graspable by the user with his fingers.

In a corresponding manner to the release lever 52 of the valve gun 10 as shown in fig. 1 and 2, the release lever 202 of the valve gun 200 carries a coupling element 208 in the form of a coupling roller 210 on its end face 72 facing away from the bearing 64. As the release lever 202 swings, the coupling roller 210 moves along a guide track 212, which is provided on a rear end 214 of the coupling lever 216 toward the release lever 202. The guide track 212 has a first end section 218, an intermediate section 220 and a second end section 222. The release lever 202 is shown in its rest position in fig. 4. Starting from the rest position, the trip lever 202 can be pivoted back about the pivot axis 66 in a direction away from the valve 24. The pivoting direction is illustrated in fig. 4 by an imaginary circular arc 224, the center point of which corresponds to the bearing point 64 of the release lever 202 and the radius of which corresponds to the distance between the contact point of the coupling link 208 on the first end portion 218 and the bearing point 64 of the release lever 202.

As can be seen directly in fig. 4, the first end section 218 and the second end section 222 are less inclined relative to the pivoting direction, i.e. less inclined relative to the imaginary circular arc 224, than the middle section 220 of the guide rail 212. This has the following advantages in the valve gun 200 shown in FIG. 4: the valve gun can be operated in a simple manner. As long as the coupling link 208 bears against the first end section 218 or against the second end section 222, a change in the pivot angle of the release lever 202 results in only a slight change in the pivot angle of the coupling lever 216, whereas a change in the pivot angle of the release lever 202 results in a significant change in the pivot angle of the coupling lever 216 when the coupling link 208 bears against the intermediate section 220.

A fourth advantageous embodiment of the valve gun according to the invention is shown schematically in fig. 5 and is generally provided with the reference numeral 250. The valve gun 250 differs from the valve gun 200 shown in fig. 4 in that instead of the coupling link 208, a guide track 252 is provided on the end face 72 of the release lever 202, which guide track has a first end section 254, an intermediate section 256 and a second end section 258, and instead of the guide track, a coupling link 260 in the form of a freely rotatable coupling roller 262 is provided on the rear end 214 of the coupling lever 216.

In the valve gun 250 shown in fig. 5, the release lever 202 can also be moved from the rest position shown in fig. 5 about the pivot axis 66 into the release position in a direction away from the valve 24. The pivoting direction is illustrated in fig. 5 by an imaginary circular arc 264, the center of which forms the bearing point 64 of the release lever 202 and the radius of which corresponds to the distance between the contact point of the coupling link 260 on the first end section 254 and the bearing point 64 of the release lever 202.

If the release lever 202 is moved from its rest position into its release position, the coupling link 260 is moved from the first end section 254 via the intermediate section 256 into the second end section 258. The inclination of the first end section 254 relative to the pivoting direction of the release lever 202, i.e. relative to the imaginary circular arc 264, is, like the inclination of the second end section 258, significantly smaller than the inclination of the intermediate section 256. This has the following advantages in the valve gun 250 shown in fig. 5: the valve gun can be operated with a small force.

Claims

1. A valve gun for a high-pressure cleaning device for discharging cleaning liquid, having a housing (12) and a valve (24) arranged in the housing (12), which has a closing body (42) which is arranged on a valve tappet (44) and bears tightly against a valve seat (40) in a closed position and which can be moved into an open position spaced apart from the valve seat (40) by pivoting a release lever (52; 202) which is pivotably mounted about a first pivot axis (66) on a bearing point (64) counter to the pressure of the cleaning liquid acting on the closing body (42), wherein the release lever (52; 202) assumes a rest position in the closed position of the closing body (42) and a release position in the open position of the closing body (42) and is connected to the valve seat (40) via a coupling lever (54; 216) which is pivotably mounted about a second pivot axis (86) The valve tappet (44) is mechanically coupled, wherein a pivoting movement of the release lever (52; 202) can be transmitted to the coupling lever (54; 216) via a coupling element (74; 154; 208; 260) which can be moved along a guide track (94; 152; 212; 252) and the guide track (94; 152; 212; 252) has a first end section (96; 160; 218; 254), an intermediate section (98; 162; 220; 256) and a second end section (100; 164; 222; 258), characterized in that the valve gun (10; 150; 200; 250) has a single coupling element (74; 154; 208; 260), along which the coupling element (74; 154; 208; 260) can be moved when the release lever (52; 202) is pivoted from a rest position into a release position, and then moved along the intermediate section (98; 162; 220; 256) and then along the second end section (100; 164; 222; 258), wherein the first end section (96; 160; 218; 254) has a smaller inclination relative to the pivoting direction of the release lever (52; 202) than the middle section (98; 162; 220; 256),

the second end section (100; 164; 222; 258) has a smaller inclination relative to the pivoting direction of the release lever (52; 202) than the middle section (98; 162; 220; 256).

2. The valve gun of claim 1,

it is characterized in that the preparation method is characterized in that,

the first end section (96; 160; 218; 254) and/or the middle section (98; 162; 220; 256) and/or the second end section (100; 164; 222; 258) are designed straight at least in regions.

3. The valve gun according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the coupling link (74; 208) is arranged on the release lever (52; 202) and the guide track (94; 212) is arranged on the coupling lever (54; 216).

4. The valve gun of claim 3,

it is characterized in that the preparation method is characterized in that,

the coupling element (74; 208) is arranged on an end side (72) of the release lever (52; 202) facing away from the first pivot axis (66).

5. The valve gun according to any one of claims 1 to 2,

it is characterized in that the preparation method is characterized in that,

the coupling link (154; 260) is arranged on the coupling rod (54; 216) and the guide track (152; 252) is arranged on the release rod (52; 202).

6. The valve gun of claim 5,

it is characterized in that the preparation method is characterized in that,

the guide track (152; 252) is arranged on an end side (72) of the release lever (52; 202) facing away from the first pivot axis (66).

7. The valve gun according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the coupling element (74; 154; 208; 260) is designed as a freely rotatable coupling roller (76; 156; 210; 262).

8. Valve gun according to claim 1 or 2, characterized in that the valve (24) has a valve inlet (28) and a valve outlet (30), wherein the valve outlet (30) projects from a front side (32) of the housing (12) and the housing (12) has a handle (56) which can be gripped by a user with his hand, wherein the release lever (52) projects in its rest position from a back side of the handle (56) facing away from the valve outlet (30).

9. The valve gun according to claim 1 or 2,

it is characterized in that the preparation method is characterized in that,

the housing (12) has a grip (56) which can be gripped by a user with a hand, which projects from a front, central or rearward region (18, 22) of the housing (12), and the first pivot axis (66) is arranged in an end region (60) of the grip (56) which faces away from the front, central or rearward region (18, 22) of the housing (12).