EP1996345B1 - High-pressure spray gun - Google Patents

Abstract

The invention relates to a high-pressure spray gun for a high-pressure cleaning appliance, comprising a housing having arranged therein a valve with an inlet channel and an outlet channel and a closing body, which is adapted to rest in a sealing manner on a sealing surface arranged between the inlet channel and the outlet channel, and which interacts with a hand lever, an insert nipple being insertable into the inlet channel and fixable in an axially immovable manner for connection of a liquid supply line. To further develop the high-pressure spray gun in such a way that a liquid supply line can be connected to and separated from the valve in a simple way, it is proposed in accordance with the invention that the high-pressure spray gun comprise an immovable securing clip with two securing parts, which are insertable into diametrically opposed lateral openings of the inlet channel in order to engage behind the insert nipple, and which are spreadable apart in a spring-elastic manner by an actuating element which is displaceably arranged in the housing.

Description

The invention relates to a high-pressure spray gun for a high-pressure cleaning device having a housing in which a valve is arranged with an inlet and an outlet channel and with a closing body which is sealingly engageable with a sealing surface arranged between the inlet and the outlet channel and with a hand lever cooperates, wherein for connecting a liquid supply line, a plug-in nipple in the inlet channel inserted and fixed axially immovable, wherein the high-pressure spray gun comprises a non-displaceable securing bracket with two Sicherungsabritten, which are insertable for engaging behind the Stecknipels in each other diameter side openings of the inlet channel.

document DE3720241 discloses such a high-pressure spray gun. Such high-pressure spray guns are used for high-pressure cleaning devices and make it possible to direct the cleaning fluid pressurized by the high-pressure cleaning device onto a surface to be cleaned, wherein the discharge quantity of the cleaning fluid can be regulated by means of the high-pressure spray gun. In particular, the flow of the cleaning liquid can be interrupted by means of the high-pressure spray gun. The cleaning fluid is pressurized by the high-pressure cleaner and passed through a fluid supply line to the high pressure spray gun.

The connection of the liquid supply line to the high-pressure spray gun is carried out with the aid of a plug-in nipple, which can be inserted into the inlet channel of the valve of the high-pressure spray gun and fixed axially immovable. Such high-pressure spray guns are for example from the European patent application EP 0 901 834 A2 known. In the embodiment described therein, the plug-in nipple is fixed by means of a fastening nut. This requires a structurally complex design.

From the patent DE 10 2004 006 592 B3 a high-pressure spray gun is known in which a high-pressure hose, via which the high-pressure spray gun is connected to the high-pressure cleaner, can be fixed by means of a U-shaped clip. However, the high pressure hose is not connected directly to the valve, but rather an additional fluid channel is provided between the valve and the high pressure hose, which is made of plastic and surrounded by a metal sleeve.

Object of the present invention is to develop a high-pressure spray gun of the type mentioned in such a way that a liquid supply line can be easily connected to the valve and separated from it.

This object is achieved in a high-pressure spray gun of the generic type according to the invention that the high-pressure spray gun comprises a non-displaceable securing bracket with two securing portions which are insertable for engaging behind the plug nipple in diametrically opposite lateral openings of the inlet channel and by means of a displaceable arranged in the housing actuator resiliently apart ,

According to the invention, a securing clip with two securing sections is used for axially fixing the plug-in nipple in the inlet channel. By means of the securing sections, a circumferential collar of the plug-in nipple can be engaged behind, so that the plug-in nipple can be fixed axially in the inlet channel in a simple manner. To a high pressure hose in a simple way connect to the valve and to be able to separate from this, the invention provides that the two securing sections using a displaceable arranged in the housing actuating element from its locking position in which they engage behind the encircling collar of a plugged into the inlet channel plug nipple, are transferred to a release position in which they release the plug nipple. For this purpose, it is only necessary to move the actuator, whereas the securing bracket is held immovably in the housing. By moving the actuating element, the two securing sections are spread apart and thereby pass into their release position, in which they are arranged at a distance from the plug-in nipple. If the actuator is released by the user again, then the resiliently spread apart securing sections automatically move back into their locking position. The high pressure spray gun according to the invention is thus characterized by a particularly simple handling when connecting a liquid supply line to the valve.

It is advantageous if the actuating element is held displaceably in a guide, for example a shaft of the housing. The housing may for example be formed in two parts from two housing shells with internal ribs, which form a shaft during assembly of the two housing shells, which constitutes a guide for the actuating element.

In a particularly preferred embodiment, the actuating element forms a wedge, which can be inserted between the two securing sections is. In such an embodiment, the actuating element comprises two obliquely aligned wedge surfaces, to which the securing portions can be applied. By moving the actuating element, the two wedge surfaces can be inserted between the securing sections and these are thereby spread apart.

The actuating element is preferably designed in the manner of a push button, which is inserted into the outer contour of the housing. This allows an attractive design of the high pressure spray gun, wherein an outwardly projecting from the housing actuator is avoided, the actuator is rather inserted into the contour of the housing. The risk of damage is thereby reduced.

The push button can be arranged, for example, in the transition region between a grip region and an outlet region of the housing. As a result, the handling of the designed as a push button actuator is simplified because the push button can be placed in a place that the user can grasp well when gripping the high-pressure spray gun.

The assembly of the high-pressure spray gun is simplified in a preferred embodiment, characterized in that the actuating element is held on the securing bracket. This makes it possible to assemble the valve including the circlip and the associated actuator to then insert it into a housing shell. Preferably, the actuating element is captively held on the securing bracket.

It can be provided, for example, that the actuating element has a clamping region which is clamped between the securing sections. In such an embodiment, the two securing portions exert a resilient clamping force on the clamping area, so that the actuating element is held in a structurally simple manner on the securing bracket.

The actuating element may be formed, for example, as a one-piece plastic molded part. It is particularly advantageous if the actuation element has a roughened, preferably corrugated or ribbed actuating surface which forms part of the outer contour of the housing.

For the design of the securing bracket so far no details have been made. It is advantageous if the securing bow has a spring element which connects the ends of the securing sections facing away from the actuating element with one another. From the spring element, a spring force can be exerted on the securing portions, so that they automatically assume their locking position and can be converted by the action of an opposing force of the spring force in their release position.

The spring element is configured in a preferred embodiment of the high-pressure spray gun according to the invention U-shaped with two legs which are interconnected via a web. It can be provided that the legs of the spring element each collinear to a securing portion are aligned. The securing sections preferably run perpendicular to the longitudinal axis of the inlet channel of the valve.

In an advantageous embodiment, the two legs of the U-shaped spring element are aligned parallel to the longitudinal axis of the inlet channel. This allows a particularly compact design of the securing bracket. In particular, it can be provided that the securing sections are each aligned perpendicular to the legs of the spring element. The spring element thus extends in Längsrichtüng the Stecknippets, which is inserted into the inlet channel.

It is advantageous if the spring element is connected in one piece with the securing sections. It can be provided, for example, that the spring element and the securing sections are formed together as a one-piece wire bracket. The securing sections can in this case be spread apart by exerting a relatively low actuating force and, nevertheless, reliably pass into their locking position when the actuating element is released.

Figur 1:

eine schematische Schnittansicht einer erfindungsgemäßen Hoch- druckspritzpistole;

Figur 2:

eine vergrößerte Schnittansicht des Ventils der Hochdruckspritzpi- stole aus Figur 1 mit angeschlossener Armatur einer Flüssigkeitszu- fuhrleitung;

Figur 3:

eine Seitenansicht des Ventils in Richtung von Pfeil A aus Figur 2;

Figur 4:

eine Schnittansicht längs der Linie 4-4 in Figur 2;

Figur 5:

eine perspektivische Darstellung des Ventils der Hochdruckspritzpi- stole aus Figur 1 und

Figur 6:

eine Ansicht der Hochdruckspritzpistole in Richtung von Pfeil B aus Figur 1.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

FIG. 1:

a schematic sectional view of a high-pressure spray gun according to the invention;

FIG. 2:

an enlarged sectional view of the valve of the Hochdruckspritzpi- stole FIG. 1 with connected fitting of a liquid supply line;

FIG. 3:

a side view of the valve in the direction of arrow A from FIG. 2 ;

FIG. 4:

a sectional view taken along the line 4-4 in FIG. 2 ;

FIG. 5:

a perspective view of the valve of the Hochdruckspritzpi- stole FIG. 1 and

FIG. 6:

a view of the high-pressure spray gun in the direction of arrow B from FIG. 1 ,

In the drawing, a generally designated by the reference numeral 10 high-pressure spray gun is shown schematically with a housing 11 made of plastic, which is formed from two half-shells 12, 13. The housing 11 comprises a grip region 15 with a handle 16 and a protective strap 17. In addition, the housing 11 forms an outlet region 19 with an outlet 20 on which a bayonet coupling 21 is fixed.

The housing 11 receives a valve 24 with a valve housing 25 which is substantially Y-shaped and has a central connecting part 26, from which, facing away from each other, a first leg 27 and a second leg 28 protrude. The first leg 27 forms an outlet channel 30, at the free end of a pipe section 31 is connected, which is extends to the outlet 20 and to which via the bayonet coupling 21 a spray lance can be connected.

The free end of the second leg 28 forms a pivot bearing 33, on which a hand lever 34 is pivotally mounted. Starting from the pivot bearing 33, the first lever arm 35 extends into the region between the handle 16 and the guard 17. The first lever arm 35 can thereby easily by the user with the Hand are embraced.

The second lever arm 36 is considerably shorter than the first lever arm 35. On the second lever arm 36 is located on a clipped into the second lever arm 36 metallic pressure plate 37, a valve stem 38, which dips into a through hole 40 of the valve housing 25 and at its second lever arm 36 facing away from a closing body 41 carries. In an over the valve housing 25 projecting end portion 38, a support ring 43 is fixed to the valve stem. Between the support ring 43 and the valve housing 25, a compression spring 44 is clamped, which acts on the valve stem 38 and the closing body 41 with a second lever arm 36 facing spring force.

The through-bore 40 opens into a chamber 39 of the valve housing 25, which receives an insert 42. While the valve housing 25 is made of a low-cost plastic material, such as polyamide or polypropylene material, the insert 42 is made of metal, preferably made of brass. It forms in the amount of the closing body 41 a conical Shoulder 46, to which a sealing channel connects in the flow direction with a sealing surface 45. At the sealing surface 45, the closing body 41, which is surrounded by a sealing ring 47, sets under the action of the compression spring 44 sealingly. By pivoting the hand lever 44, the closing body 41 can be lifted from the sealing surface 45 and thereby transferred from its closed position to its open position.

Upstream of the sealing surface 45, the insert part 42 forms an inlet channel 49, and downstream of the sealing surface 45, the outlet channel 30 branches off from the through-bore 40.

At the level of the inlet channel 49, the insert part 42 has two diametrically opposite lateral openings in the form of two insertion slots 50a, 50b extending in the circumferential direction over a portion of the inlet channel 49 and each with a corresponding lateral opening of the valve housing 25 in the form of a Slot 51 and 52 are aligned. How out FIG. 3 becomes clear, the insertion slots 50a, 50b, 51, 52 each have an upstream wall portion 53a and a downstream wall portion 53b, which are inclined at least in its radially inner region obliquely to the radial direction, namely in the flow direction.

The insertion slots 50a, 50b and 51,52 are penetrated transversely to the longitudinal axis of the inlet channel 49 by a securing portion 54 and 55 of a securing bracket 56. The safety bracket 56 is formed as a one-piece wire bracket and includes in addition to the securing portions 54 and 55th a U-shaped spring element 58 having a first leg 59 and a second leg 60, which are integrally connected to each other via an arcuate web 61 and which are each integrally connected to a securing portion 54 and 55, respectively. The spring element 58 facing away from the ends of the securing portions 54 and 55 are bent by 90 ° in the direction of the first leg 27 of the valve housing 25.

At the level of the inlet channel 49, the housing 11 forms a guide shaft 64, which receives an actuating element in the form of a plastic push button 65 slidably. The push button 65 forms a corrugated, convexly outwardly curved contact surface 66, which fits into the outer contour of the housing 11. How out FIG. 4 becomes clear, the push button 65 on the contact surface 66 facing away from the inside two obliquely aligned wedge surfaces 67, 68 which are integrally connected to each other via a U-shaped clamping portion 69 in cross-section. With the clamping region 69, the push button 65 projects between the two securing sections 54, 55, which clamp the clamping region 69 between them due to the spring force exerted by the spring element 58.

A liquid supply line in the form of a high-pressure hose 71 can be connected to the high-pressure spray gun 10. For this purpose, a connection fitting 72 is used with a plug-in nipple 74 which can be inserted into the inlet channel 59 and a press-fit nipple 75 which dips into the free end of the high-pressure hose 71 and is pressed with the high-pressure hose 71 with the aid of a compression sleeve 76 embracing the high-pressure hose 71.

The plug-in nipple 74 has within the inlet channel 49 a circumferential annular groove 78, to which a circumferential collar 79 connects upstream. Upstream of the collar 79, the plug-in nipple 74 carries in an end region 77 with a smaller diameter a further annular groove 80 which receives a sealing ring 81. The sealing ring 81 bears sealingly against the wall of the inlet channel 49.

The inserted into the inlet channel 49 plug-in nipple 74 is fixed by means of the securing bracket 56 in the axial direction. For this purpose, the securing portions 54, 55 engage behind the collar 79 and dive into the annular groove 78. If the high-pressure hose 71 is to be detached from the high-pressure spray gun 10, then it is only necessary to actuate the pushbutton 65, that is, to insert it into the guide shaft 64. This has the consequence that the spring element 58 facing away from the end portions of the securing portions 54 and 55 slide along the wedge surfaces 67 and 68 and thereby be spread apart against the force exerted by the spring element 58 spring force. They can be spread so far by means of the push button 65 that they come out of engagement with the plug nipple 74 so that it can be easily pulled out of the inlet channel 49 by the user and thereby the high pressure hose 71 can be separated from the high pressure spray gun 10. If the push button 65 is released by the user, it is moved by the securing portions 54, 55 back to the free end of the guide shaft 64, since the securing portions 54, 55 are acted upon by the spring element 58 with an elastic restoring force. If the high-pressure hose 71 is to be reconnected, the securing sections 54, 55 can be spread apart again by means of the push-button 65, so that the plug-in nipple 74 can be easily inserted into the inlet channel 49. Alternatively, the end region 77 of the plug-in nipple can be inserted between the securing sections 54, 55 and subsequently the plug-in nipple 74 can be pressed in between the securing sections 54, 55, so that these are transferred from the plug-in nipple 74 into their release position. In order to be able to use the end region 77 between the securing sections 54, 55, the diameter of the end region is smaller than the spacing of the securing sections 54, 55. The plug-in nipple 74 can be inserted into the inlet channel 49 far enough for the securing sections to dip into the annular groove 78 and thereby fix the plug nipple in the axial direction. The high-pressure spray gun 10 according to the invention is thus distinguished by a very simple handling when connecting the high-pressure hose 71. If the high-pressure hose 71 connected to the high-pressure spray gun 10 is subjected to pressurized cleaning liquid, then the plug-in nipple 74 and, via it, also the securing bracket 56 experiences a tensile force counter to the flow direction of the cleaning liquid. Due to the obliquely oriented to the radial wall portions 53a of the insertion slots 50a, 50b, 51, 52, this has the consequence that the voltage applied to the wall portions 53a securing portions 54, 55 are compressed and thereby exercise a reinforced holding force on the plug-in nipple 74.

Claims (10)

1. High-pressure spray gun for a high-pressure cleaning appliance, comprising a housing having arranged therein a valve with an inlet channel and an outlet channel and a closing body, which is adapted to rest in a sealing manner on a sealing surface arranged between the inlet channel and the outlet channel, and which interacts with a hand lever, an insert nipple being insertable into the inlet channel and fixable in an axially immovable manner for connection of a liquid supply line, the high-pressure spray gun (10) comprising an immovable securing clip (56) with two securing parts (54, 55), which are insertable into diametrically opposed lateral openings (51, 52) of the inlet channel (49) in order to engage behind the insert nipple (74), characterized in that these two securing parts are spreadable apart in a spring-elastic manner by an actuating element (65) which is displaceably arranged in the housing (11).
2. High-pressure spray gun in accordance with claim 1, characterized in that the actuating element (65) is displaceably held in a guide (64) of the housing (11).
3. High-pressure spray gun in accordance with claim 1 or 2, characterized in that the actuating element (65) forms a wedge (67, 68) which is insertable between the two securing parts (54, 55).
4. High-pressure spray gun in accordance with any one of the preceding claims, characterized in that the actuating element is designed in the manner of a pushbutton (65) which blends into the outer contour of the housing (11).
5. High-pressure spray gun in accordance with any one of the preceding claims, characterized in that the actuating element (65) is held on the securing clip (56).
6. High-pressure spray gun in accordance with any one of the preceding claims, characterized in that the actuating element (65) has a clamp portion (69) which is clamped between the securing parts (54, 55).
7. High-pressure spray gun in accordance with any one of the preceding claims, characterized in that the securing clip (56) comprises a spring element (58) which joins the ends of the securing parts (54, 55) that face away from the actuating element (65) to each other.
8. High-pressure spray gun in accordance with claim 7, characterized in that the spring element (58) is of U-shaped configuration.
9. High-pressure spray gun in accordance with claim 8, characterized in that the spring element (58) comprises two legs (59, 60) which are aligned parallel to the longitudinal axis of the inlet channel (49) and are integrally joined to each other by a crosspiece (61).
10. High-pressure spray gun in accordance with claim 7, 8 or 9, characterized in that the spring element (58) is integrally joined to the securing parts (54, 55).

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